1 /* $OpenBSD: kern_pledge.c,v 1.250 2019/01/22 00:59:31 deraadt Exp $ */ 2 3 /* 4 * Copyright (c) 2015 Nicholas Marriott <nicm@openbsd.org> 5 * Copyright (c) 2015 Theo de Raadt <deraadt@openbsd.org> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 #include <sys/param.h> 21 22 #include <sys/mount.h> 23 #include <sys/proc.h> 24 #include <sys/fcntl.h> 25 #include <sys/file.h> 26 #include <sys/filedesc.h> 27 #include <sys/namei.h> 28 #include <sys/pool.h> 29 #include <sys/socketvar.h> 30 #include <sys/vnode.h> 31 #include <sys/mbuf.h> 32 #include <sys/mman.h> 33 #include <sys/sysctl.h> 34 #include <sys/syslog.h> 35 #include <sys/ktrace.h> 36 #include <sys/acct.h> 37 38 #include <sys/ioctl.h> 39 #include <sys/termios.h> 40 #include <sys/tty.h> 41 #include <sys/device.h> 42 #include <sys/disklabel.h> 43 #include <sys/dkio.h> 44 #include <sys/mtio.h> 45 #include <sys/audioio.h> 46 #include <sys/videoio.h> 47 #include <net/bpf.h> 48 #include <net/route.h> 49 #include <net/if.h> 50 #include <net/if_var.h> 51 #include <netinet/in.h> 52 #include <netinet6/in6_var.h> 53 #include <netinet6/nd6.h> 54 #include <netinet/tcp.h> 55 #include <net/pfvar.h> 56 57 #include <sys/conf.h> 58 #include <sys/specdev.h> 59 #include <sys/signal.h> 60 #include <sys/signalvar.h> 61 #include <sys/syscall.h> 62 #include <sys/syscallargs.h> 63 #include <sys/systm.h> 64 65 #include <dev/biovar.h> 66 67 #define PLEDGENAMES 68 #include <sys/pledge.h> 69 70 #include "audio.h" 71 #include "bpfilter.h" 72 #include "pf.h" 73 #include "video.h" 74 #include "pty.h" 75 76 #if defined(__amd64__) 77 #include "vmm.h" 78 #if NVMM > 0 79 #include <machine/conf.h> 80 #endif 81 #endif 82 83 #if defined(__amd64__) || defined(__arm64__) || \ 84 defined(__i386__) || defined(__loongson__) || \ 85 defined(__macppc__) || defined(__sparc64__) 86 #include "drm.h" 87 #endif 88 89 uint64_t pledgereq_flags(const char *req); 90 int parsepledges(struct proc *p, const char *kname, 91 const char *promises, u_int64_t *fp); 92 int canonpath(const char *input, char *buf, size_t bufsize); 93 void unveil_destroy(struct process *ps); 94 95 /* #define DEBUG_PLEDGE */ 96 #ifdef DEBUG_PLEDGE 97 int debug_pledge = 1; 98 #define DPRINTF(x...) do { if (debug_pledge) printf(x); } while (0) 99 #define DNPRINTF(n,x...) do { if (debug_pledge >= (n)) printf(x); } while (0) 100 #else 101 #define DPRINTF(x...) 102 #define DNPRINTF(n,x...) 103 #endif 104 105 /* 106 * Ordered in blocks starting with least risky and most required. 107 */ 108 const uint64_t pledge_syscalls[SYS_MAXSYSCALL] = { 109 /* 110 * Minimum required 111 */ 112 [SYS_exit] = PLEDGE_ALWAYS, 113 [SYS_kbind] = PLEDGE_ALWAYS, 114 [SYS___get_tcb] = PLEDGE_ALWAYS, 115 [SYS___set_tcb] = PLEDGE_ALWAYS, 116 [SYS_pledge] = PLEDGE_ALWAYS, 117 [SYS_sendsyslog] = PLEDGE_ALWAYS, /* stack protector reporting */ 118 [SYS_thrkill] = PLEDGE_ALWAYS, /* raise, abort, stack pro */ 119 [SYS_utrace] = PLEDGE_ALWAYS, /* ltrace(1) from ld.so */ 120 121 /* "getting" information about self is considered safe */ 122 [SYS_getuid] = PLEDGE_STDIO, 123 [SYS_geteuid] = PLEDGE_STDIO, 124 [SYS_getresuid] = PLEDGE_STDIO, 125 [SYS_getgid] = PLEDGE_STDIO, 126 [SYS_getegid] = PLEDGE_STDIO, 127 [SYS_getresgid] = PLEDGE_STDIO, 128 [SYS_getgroups] = PLEDGE_STDIO, 129 [SYS_getlogin_r] = PLEDGE_STDIO, 130 [SYS_getpgrp] = PLEDGE_STDIO, 131 [SYS_getpgid] = PLEDGE_STDIO, 132 [SYS_getppid] = PLEDGE_STDIO, 133 [SYS_getsid] = PLEDGE_STDIO, 134 [SYS_getthrid] = PLEDGE_STDIO, 135 [SYS_getrlimit] = PLEDGE_STDIO, 136 [SYS_getrtable] = PLEDGE_STDIO, 137 [SYS_gettimeofday] = PLEDGE_STDIO, 138 [SYS_getdtablecount] = PLEDGE_STDIO, 139 [SYS_getrusage] = PLEDGE_STDIO, 140 [SYS_issetugid] = PLEDGE_STDIO, 141 [SYS_clock_getres] = PLEDGE_STDIO, 142 [SYS_clock_gettime] = PLEDGE_STDIO, 143 [SYS_getpid] = PLEDGE_STDIO, 144 145 /* 146 * Almost exclusively read-only, Very narrow subset. 147 * Use of "route", "inet", "dns", "ps", or "vminfo" 148 * expands access. 149 */ 150 [SYS_sysctl] = PLEDGE_STDIO, 151 152 /* Support for malloc(3) family of operations */ 153 [SYS_getentropy] = PLEDGE_STDIO, 154 [SYS_madvise] = PLEDGE_STDIO, 155 [SYS_minherit] = PLEDGE_STDIO, 156 [SYS_mmap] = PLEDGE_STDIO, 157 [SYS_mprotect] = PLEDGE_STDIO, 158 [SYS_mquery] = PLEDGE_STDIO, 159 [SYS_munmap] = PLEDGE_STDIO, 160 [SYS_msync] = PLEDGE_STDIO, 161 [SYS_break] = PLEDGE_STDIO, 162 163 [SYS_umask] = PLEDGE_STDIO, 164 165 /* read/write operations */ 166 [SYS_read] = PLEDGE_STDIO, 167 [SYS_readv] = PLEDGE_STDIO, 168 [SYS_pread] = PLEDGE_STDIO, 169 [SYS_preadv] = PLEDGE_STDIO, 170 [SYS_write] = PLEDGE_STDIO, 171 [SYS_writev] = PLEDGE_STDIO, 172 [SYS_pwrite] = PLEDGE_STDIO, 173 [SYS_pwritev] = PLEDGE_STDIO, 174 [SYS_recvmsg] = PLEDGE_STDIO, 175 [SYS_recvfrom] = PLEDGE_STDIO | PLEDGE_YPACTIVE, 176 [SYS_ftruncate] = PLEDGE_STDIO, 177 [SYS_lseek] = PLEDGE_STDIO, 178 [SYS_fpathconf] = PLEDGE_STDIO, 179 180 /* 181 * Address selection required a network pledge ("inet", 182 * "unix", "dns". 183 */ 184 [SYS_sendto] = PLEDGE_STDIO | PLEDGE_YPACTIVE, 185 186 /* 187 * Address specification required a network pledge ("inet", 188 * "unix", "dns". SCM_RIGHTS requires "sendfd" or "recvfd". 189 */ 190 [SYS_sendmsg] = PLEDGE_STDIO, 191 192 /* Common signal operations */ 193 [SYS_nanosleep] = PLEDGE_STDIO, 194 [SYS_sigaltstack] = PLEDGE_STDIO, 195 [SYS_sigprocmask] = PLEDGE_STDIO, 196 [SYS_sigsuspend] = PLEDGE_STDIO, 197 [SYS_sigaction] = PLEDGE_STDIO, 198 [SYS_sigreturn] = PLEDGE_STDIO, 199 [SYS_sigpending] = PLEDGE_STDIO, 200 [SYS_getitimer] = PLEDGE_STDIO, 201 [SYS_setitimer] = PLEDGE_STDIO, 202 203 /* 204 * To support event driven programming. 205 */ 206 [SYS_poll] = PLEDGE_STDIO, 207 [SYS_ppoll] = PLEDGE_STDIO, 208 [SYS_kevent] = PLEDGE_STDIO, 209 [SYS_kqueue] = PLEDGE_STDIO, 210 [SYS_select] = PLEDGE_STDIO, 211 [SYS_pselect] = PLEDGE_STDIO, 212 213 [SYS_fstat] = PLEDGE_STDIO, 214 [SYS_fsync] = PLEDGE_STDIO, 215 216 [SYS_setsockopt] = PLEDGE_STDIO, /* narrow whitelist */ 217 [SYS_getsockopt] = PLEDGE_STDIO, /* narrow whitelist */ 218 219 /* F_SETOWN requires PLEDGE_PROC */ 220 [SYS_fcntl] = PLEDGE_STDIO, 221 222 [SYS_close] = PLEDGE_STDIO, 223 [SYS_dup] = PLEDGE_STDIO, 224 [SYS_dup2] = PLEDGE_STDIO, 225 [SYS_dup3] = PLEDGE_STDIO, 226 [SYS_closefrom] = PLEDGE_STDIO, 227 [SYS_shutdown] = PLEDGE_STDIO, 228 [SYS_fchdir] = PLEDGE_STDIO, /* XXX consider tightening */ 229 230 [SYS_pipe] = PLEDGE_STDIO, 231 [SYS_pipe2] = PLEDGE_STDIO, 232 [SYS_socketpair] = PLEDGE_STDIO, 233 234 [SYS_wait4] = PLEDGE_STDIO, 235 236 /* 237 * Can kill self with "stdio". Killing another pid 238 * requires "proc" 239 */ 240 [SYS_kill] = PLEDGE_STDIO, 241 242 /* 243 * FIONREAD/FIONBIO for "stdio" 244 * Other ioctl are selectively allowed based upon other pledges. 245 */ 246 [SYS_ioctl] = PLEDGE_STDIO, 247 248 /* 249 * Path access/creation calls encounter many extensive 250 * checks done during pledge_namei() 251 */ 252 [SYS_open] = PLEDGE_STDIO, 253 [SYS_stat] = PLEDGE_STDIO, 254 [SYS_access] = PLEDGE_STDIO, 255 [SYS_readlink] = PLEDGE_STDIO, 256 257 [SYS_adjtime] = PLEDGE_STDIO, /* setting requires "settime" */ 258 [SYS_adjfreq] = PLEDGE_SETTIME, 259 [SYS_settimeofday] = PLEDGE_SETTIME, 260 261 /* 262 * Needed by threaded programs 263 * XXX should we have a new "threads"? 264 */ 265 [SYS___tfork] = PLEDGE_STDIO, 266 [SYS_sched_yield] = PLEDGE_STDIO, 267 [SYS_futex] = PLEDGE_STDIO, 268 [SYS___thrsleep] = PLEDGE_STDIO, 269 [SYS___thrwakeup] = PLEDGE_STDIO, 270 [SYS___threxit] = PLEDGE_STDIO, 271 [SYS___thrsigdivert] = PLEDGE_STDIO, 272 273 [SYS_fork] = PLEDGE_PROC, 274 [SYS_vfork] = PLEDGE_PROC, 275 [SYS_setpgid] = PLEDGE_PROC, 276 [SYS_setsid] = PLEDGE_PROC, 277 278 [SYS_setrlimit] = PLEDGE_PROC | PLEDGE_ID, 279 [SYS_getpriority] = PLEDGE_PROC | PLEDGE_ID, 280 281 [SYS_setpriority] = PLEDGE_PROC | PLEDGE_ID, 282 283 [SYS_setuid] = PLEDGE_ID, 284 [SYS_seteuid] = PLEDGE_ID, 285 [SYS_setreuid] = PLEDGE_ID, 286 [SYS_setresuid] = PLEDGE_ID, 287 [SYS_setgid] = PLEDGE_ID, 288 [SYS_setegid] = PLEDGE_ID, 289 [SYS_setregid] = PLEDGE_ID, 290 [SYS_setresgid] = PLEDGE_ID, 291 [SYS_setgroups] = PLEDGE_ID, 292 [SYS_setlogin] = PLEDGE_ID, 293 294 [SYS_unveil] = PLEDGE_UNVEIL, 295 296 [SYS_execve] = PLEDGE_EXEC, 297 298 [SYS_chdir] = PLEDGE_RPATH, 299 [SYS_openat] = PLEDGE_RPATH | PLEDGE_WPATH, 300 [SYS_fstatat] = PLEDGE_RPATH | PLEDGE_WPATH, 301 [SYS_faccessat] = PLEDGE_RPATH | PLEDGE_WPATH, 302 [SYS_readlinkat] = PLEDGE_RPATH | PLEDGE_WPATH, 303 [SYS_lstat] = PLEDGE_RPATH | PLEDGE_WPATH | PLEDGE_TMPPATH, 304 [SYS_truncate] = PLEDGE_WPATH, 305 [SYS_rename] = PLEDGE_RPATH | PLEDGE_CPATH, 306 [SYS_rmdir] = PLEDGE_CPATH, 307 [SYS_renameat] = PLEDGE_CPATH, 308 [SYS_link] = PLEDGE_CPATH, 309 [SYS_linkat] = PLEDGE_CPATH, 310 [SYS_symlink] = PLEDGE_CPATH, 311 [SYS_symlinkat] = PLEDGE_CPATH, 312 [SYS_unlink] = PLEDGE_CPATH | PLEDGE_TMPPATH, 313 [SYS_unlinkat] = PLEDGE_CPATH, 314 [SYS_mkdir] = PLEDGE_CPATH, 315 [SYS_mkdirat] = PLEDGE_CPATH, 316 317 [SYS_mkfifo] = PLEDGE_DPATH, 318 [SYS_mknod] = PLEDGE_DPATH, 319 320 [SYS_revoke] = PLEDGE_TTY, /* also requires PLEDGE_RPATH */ 321 322 /* 323 * Classify as RPATH|WPATH, because of path information leakage. 324 * WPATH due to unknown use of mk*temp(3) on non-/tmp paths.. 325 */ 326 [SYS___getcwd] = PLEDGE_RPATH | PLEDGE_WPATH, 327 328 /* Classify as RPATH, because these leak path information */ 329 [SYS_getdents] = PLEDGE_RPATH, 330 [SYS_getfsstat] = PLEDGE_RPATH, 331 [SYS_statfs] = PLEDGE_RPATH, 332 [SYS_fstatfs] = PLEDGE_RPATH, 333 [SYS_pathconf] = PLEDGE_RPATH, 334 335 [SYS_utimes] = PLEDGE_FATTR, 336 [SYS_futimes] = PLEDGE_FATTR, 337 [SYS_utimensat] = PLEDGE_FATTR, 338 [SYS_futimens] = PLEDGE_FATTR, 339 [SYS_chmod] = PLEDGE_FATTR, 340 [SYS_fchmod] = PLEDGE_FATTR, 341 [SYS_fchmodat] = PLEDGE_FATTR, 342 [SYS_chflags] = PLEDGE_FATTR, 343 [SYS_chflagsat] = PLEDGE_FATTR, 344 [SYS_fchflags] = PLEDGE_FATTR, 345 346 [SYS_chown] = PLEDGE_CHOWN, 347 [SYS_fchownat] = PLEDGE_CHOWN, 348 [SYS_lchown] = PLEDGE_CHOWN, 349 [SYS_fchown] = PLEDGE_CHOWN, 350 351 [SYS_socket] = PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS | PLEDGE_YPACTIVE, 352 [SYS_connect] = PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS | PLEDGE_YPACTIVE, 353 [SYS_bind] = PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS | PLEDGE_YPACTIVE, 354 [SYS_getsockname] = PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS | PLEDGE_YPACTIVE, 355 356 [SYS_listen] = PLEDGE_INET | PLEDGE_UNIX, 357 [SYS_accept4] = PLEDGE_INET | PLEDGE_UNIX, 358 [SYS_accept] = PLEDGE_INET | PLEDGE_UNIX, 359 [SYS_getpeername] = PLEDGE_INET | PLEDGE_UNIX, 360 361 [SYS_flock] = PLEDGE_FLOCK | PLEDGE_YPACTIVE, 362 363 [SYS_swapctl] = PLEDGE_VMINFO, /* XXX should limit to "get" operations */ 364 }; 365 366 static const struct { 367 char *name; 368 uint64_t flags; 369 } pledgereq[] = { 370 { "audio", PLEDGE_AUDIO }, 371 { "bpf", PLEDGE_BPF }, 372 { "chown", PLEDGE_CHOWN | PLEDGE_CHOWNUID }, 373 { "cpath", PLEDGE_CPATH }, 374 { "disklabel", PLEDGE_DISKLABEL }, 375 { "dns", PLEDGE_DNS }, 376 { "dpath", PLEDGE_DPATH }, 377 { "drm", PLEDGE_DRM }, 378 { "error", PLEDGE_ERROR }, 379 { "exec", PLEDGE_EXEC }, 380 { "fattr", PLEDGE_FATTR | PLEDGE_CHOWN }, 381 { "flock", PLEDGE_FLOCK }, 382 { "getpw", PLEDGE_GETPW }, 383 { "id", PLEDGE_ID }, 384 { "inet", PLEDGE_INET }, 385 { "mcast", PLEDGE_MCAST }, 386 { "pf", PLEDGE_PF }, 387 { "proc", PLEDGE_PROC }, 388 { "prot_exec", PLEDGE_PROTEXEC }, 389 { "ps", PLEDGE_PS }, 390 { "recvfd", PLEDGE_RECVFD }, 391 { "route", PLEDGE_ROUTE }, 392 { "rpath", PLEDGE_RPATH }, 393 { "sendfd", PLEDGE_SENDFD }, 394 { "settime", PLEDGE_SETTIME }, 395 { "stdio", PLEDGE_STDIO }, 396 { "tape", PLEDGE_TAPE }, 397 { "tmppath", PLEDGE_TMPPATH }, 398 { "tty", PLEDGE_TTY }, 399 { "unix", PLEDGE_UNIX }, 400 { "unveil", PLEDGE_UNVEIL }, 401 { "video", PLEDGE_VIDEO }, 402 { "vminfo", PLEDGE_VMINFO }, 403 { "vmm", PLEDGE_VMM }, 404 { "wpath", PLEDGE_WPATH }, 405 { "wroute", PLEDGE_WROUTE }, 406 }; 407 408 int 409 parsepledges(struct proc *p, const char *kname, const char *promises, u_int64_t *fp) 410 { 411 size_t rbuflen; 412 char *rbuf, *rp, *pn; 413 u_int64_t flags = 0, f; 414 int error; 415 416 rbuf = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 417 error = copyinstr(promises, rbuf, MAXPATHLEN, 418 &rbuflen); 419 if (error) { 420 free(rbuf, M_TEMP, MAXPATHLEN); 421 return (error); 422 } 423 #ifdef KTRACE 424 if (KTRPOINT(p, KTR_STRUCT)) 425 ktrstruct(p, kname, rbuf, rbuflen-1); 426 #endif 427 428 for (rp = rbuf; rp && *rp; rp = pn) { 429 pn = strchr(rp, ' '); /* find terminator */ 430 if (pn) { 431 while (*pn == ' ') 432 *pn++ = '\0'; 433 } 434 if ((f = pledgereq_flags(rp)) == 0) { 435 free(rbuf, M_TEMP, MAXPATHLEN); 436 return (EINVAL); 437 } 438 flags |= f; 439 } 440 free(rbuf, M_TEMP, MAXPATHLEN); 441 *fp = flags; 442 return 0; 443 } 444 445 int 446 sys_pledge(struct proc *p, void *v, register_t *retval) 447 { 448 struct sys_pledge_args /* { 449 syscallarg(const char *)promises; 450 syscallarg(const char *)execpromises; 451 } */ *uap = v; 452 struct process *pr = p->p_p; 453 uint64_t promises, execpromises; 454 int error; 455 456 if (SCARG(uap, promises)) { 457 error = parsepledges(p, "pledgereq", 458 SCARG(uap, promises), &promises); 459 if (error) 460 return (error); 461 462 /* In "error" mode, ignore promise increase requests, 463 * but accept promise decrease requests */ 464 if (ISSET(pr->ps_flags, PS_PLEDGE) && 465 (pr->ps_pledge & PLEDGE_ERROR)) 466 promises &= (pr->ps_pledge & PLEDGE_USERSET); 467 468 /* Only permit reductions */ 469 if (ISSET(pr->ps_flags, PS_PLEDGE) && 470 (((promises | pr->ps_pledge) != pr->ps_pledge))) 471 return (EPERM); 472 } 473 if (SCARG(uap, execpromises)) { 474 error = parsepledges(p, "pledgeexecreq", 475 SCARG(uap, execpromises), &execpromises); 476 if (error) 477 return (error); 478 479 /* Only permit reductions */ 480 if (ISSET(pr->ps_flags, PS_EXECPLEDGE) && 481 (((execpromises | pr->ps_execpledge) != pr->ps_execpledge))) 482 return (EPERM); 483 } 484 485 if (SCARG(uap, promises)) { 486 pr->ps_pledge = promises; 487 pr->ps_flags |= PS_PLEDGE; 488 /* 489 * Kill off unveil and drop unveil vnode refs if we no 490 * longer are holding any path-accessing pledge 491 */ 492 if ((pr->ps_pledge & (PLEDGE_RPATH | PLEDGE_WPATH | 493 PLEDGE_CPATH | PLEDGE_DPATH | PLEDGE_TMPPATH | PLEDGE_EXEC | 494 PLEDGE_UNIX | PLEDGE_UNVEIL)) == 0) 495 unveil_destroy(pr); 496 } 497 if (SCARG(uap, execpromises)) { 498 pr->ps_execpledge = execpromises; 499 pr->ps_flags |= PS_EXECPLEDGE; 500 } 501 return (0); 502 } 503 504 int 505 pledge_syscall(struct proc *p, int code, uint64_t *tval) 506 { 507 p->p_pledge_syscall = code; 508 *tval = 0; 509 510 if (code < 0 || code > SYS_MAXSYSCALL - 1) 511 return (EINVAL); 512 513 if (pledge_syscalls[code] == PLEDGE_ALWAYS) 514 return (0); 515 516 if (p->p_p->ps_pledge & pledge_syscalls[code]) 517 return (0); 518 519 *tval = pledge_syscalls[code]; 520 return (EPERM); 521 } 522 523 int 524 pledge_fail(struct proc *p, int error, uint64_t code) 525 { 526 char *codes = ""; 527 int i; 528 struct sigaction sa; 529 530 /* Print first matching pledge */ 531 for (i = 0; code && pledgenames[i].bits != 0; i++) 532 if (pledgenames[i].bits & code) { 533 codes = pledgenames[i].name; 534 break; 535 } 536 #ifdef KTRACE 537 if (KTRPOINT(p, KTR_PLEDGE)) 538 ktrpledge(p, error, code, p->p_pledge_syscall); 539 #endif 540 if (p->p_p->ps_pledge & PLEDGE_ERROR) 541 return (ENOSYS); 542 543 KERNEL_LOCK(); 544 log(LOG_ERR, "%s[%d]: pledge \"%s\", syscall %d\n", 545 p->p_p->ps_comm, p->p_p->ps_pid, codes, p->p_pledge_syscall); 546 p->p_p->ps_acflag |= APLEDGE; 547 548 /* Send uncatchable SIGABRT for coredump */ 549 memset(&sa, 0, sizeof sa); 550 sa.sa_handler = SIG_DFL; 551 setsigvec(p, SIGABRT, &sa); 552 atomic_clearbits_int(&p->p_sigmask, sigmask(SIGABRT)); 553 psignal(p, SIGABRT); 554 555 p->p_p->ps_pledge = 0; /* Disable all PLEDGE_ flags */ 556 KERNEL_UNLOCK(); 557 return (error); 558 } 559 560 /* 561 * Need to make it more obvious that one cannot get through here 562 * without the right flags set 563 */ 564 int 565 pledge_namei(struct proc *p, struct nameidata *ni, char *origpath) 566 { 567 char path[PATH_MAX]; 568 int error; 569 570 if ((p->p_p->ps_flags & PS_PLEDGE) == 0 || 571 (p->p_p->ps_flags & PS_COREDUMP)) 572 return (0); 573 574 if (ni->ni_pledge == 0) 575 panic("pledge_namei: ni_pledge"); 576 577 /* 578 * We set the BYPASSUNVEIL flag to skip unveil checks 579 * as necessary 580 */ 581 582 /* Doing a permitted execve() */ 583 if ((ni->ni_pledge & PLEDGE_EXEC) && 584 (p->p_p->ps_pledge & PLEDGE_EXEC)) 585 return (0); 586 587 error = canonpath(origpath, path, sizeof(path)); 588 if (error) 589 return (error); 590 591 /* Detect what looks like a mkstemp(3) family operation */ 592 if ((p->p_p->ps_pledge & PLEDGE_TMPPATH) && 593 (p->p_pledge_syscall == SYS_open) && 594 (ni->ni_pledge & PLEDGE_CPATH) && 595 strncmp(path, "/tmp/", sizeof("/tmp/") - 1) == 0) { 596 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 597 return (0); 598 } 599 600 /* Allow unlinking of a mkstemp(3) file... 601 * Good opportunity for strict checks here. 602 */ 603 if ((p->p_p->ps_pledge & PLEDGE_TMPPATH) && 604 (p->p_pledge_syscall == SYS_unlink) && 605 strncmp(path, "/tmp/", sizeof("/tmp/") - 1) == 0) { 606 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 607 return (0); 608 } 609 610 /* Whitelisted paths */ 611 switch (p->p_pledge_syscall) { 612 case SYS_access: 613 /* tzset() needs this. */ 614 if (ni->ni_pledge == PLEDGE_RPATH && 615 strcmp(path, "/etc/localtime") == 0) { 616 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 617 return (0); 618 } 619 620 /* when avoiding YP mode, getpw* functions touch this */ 621 if (ni->ni_pledge == PLEDGE_RPATH && 622 strcmp(path, "/var/run/ypbind.lock") == 0) { 623 if ((p->p_p->ps_pledge & PLEDGE_GETPW) || 624 (ni->ni_unveil == UNVEIL_INSPECT)) { 625 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 626 return (0); 627 } else 628 return (pledge_fail(p, error, PLEDGE_GETPW)); 629 } 630 break; 631 case SYS_open: 632 /* daemon(3) or other such functions */ 633 if ((ni->ni_pledge & ~(PLEDGE_RPATH | PLEDGE_WPATH)) == 0 && 634 strcmp(path, "/dev/null") == 0) { 635 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 636 return (0); 637 } 638 639 /* readpassphrase(3), getpass(3) */ 640 if ((p->p_p->ps_pledge & PLEDGE_TTY) && 641 (ni->ni_pledge & ~(PLEDGE_RPATH | PLEDGE_WPATH)) == 0 && 642 strcmp(path, "/dev/tty") == 0) { 643 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 644 return (0); 645 } 646 647 /* getpw* and friends need a few files */ 648 if ((ni->ni_pledge == PLEDGE_RPATH) && 649 (p->p_p->ps_pledge & PLEDGE_GETPW)) { 650 if (strcmp(path, "/etc/spwd.db") == 0) 651 return (EPERM); /* don't call pledge_fail */ 652 if (strcmp(path, "/etc/pwd.db") == 0) { 653 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 654 return (0); 655 } 656 if (strcmp(path, "/etc/group") == 0) { 657 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 658 return (0); 659 } 660 if (strcmp(path, "/etc/netid") == 0) { 661 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 662 return (0); 663 } 664 } 665 666 /* DNS needs /etc/{resolv.conf,hosts,services}. */ 667 if ((ni->ni_pledge == PLEDGE_RPATH) && 668 (p->p_p->ps_pledge & PLEDGE_DNS)) { 669 if (strcmp(path, "/etc/resolv.conf") == 0) { 670 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 671 return (0); 672 } 673 if (strcmp(path, "/etc/hosts") == 0) { 674 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 675 return (0); 676 } 677 if (strcmp(path, "/etc/services") == 0) { 678 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 679 return (0); 680 } 681 } 682 683 if ((ni->ni_pledge == PLEDGE_RPATH) && 684 (p->p_p->ps_pledge & PLEDGE_GETPW)) { 685 if (strcmp(path, "/var/run/ypbind.lock") == 0) { 686 /* 687 * XXX 688 * The current hack for YP support in "getpw" 689 * is to enable some "inet" features until 690 * next pledge call. This is not considered 691 * worse than pre-pledge, but is a work in 692 * progress, needing a clever design. 693 */ 694 p->p_p->ps_pledge |= PLEDGE_YPACTIVE; 695 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 696 return (0); 697 } 698 if (strncmp(path, "/var/yp/binding/", 699 sizeof("/var/yp/binding/") - 1) == 0) { 700 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 701 return (0); 702 } 703 } 704 705 /* tzset() needs these. */ 706 if ((ni->ni_pledge == PLEDGE_RPATH) && 707 strncmp(path, "/usr/share/zoneinfo/", 708 sizeof("/usr/share/zoneinfo/") - 1) == 0) { 709 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 710 return (0); 711 } 712 if ((ni->ni_pledge == PLEDGE_RPATH) && 713 strcmp(path, "/etc/localtime") == 0) { 714 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 715 return (0); 716 } 717 718 break; 719 case SYS_readlink: 720 /* Allow /etc/malloc.conf for malloc(3). */ 721 if ((ni->ni_pledge == PLEDGE_RPATH) && 722 strcmp(path, "/etc/malloc.conf") == 0) { 723 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 724 return (0); 725 } 726 break; 727 case SYS_stat: 728 /* DNS needs /etc/resolv.conf. */ 729 if ((ni->ni_pledge == PLEDGE_RPATH) && 730 (p->p_p->ps_pledge & PLEDGE_DNS) && 731 strcmp(path, "/etc/resolv.conf") == 0) { 732 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 733 return (0); 734 } 735 break; 736 } 737 738 /* 739 * Ensure each flag of ni_pledge has counterpart allowing it in 740 * ps_pledge. 741 */ 742 if (ni->ni_pledge & ~p->p_p->ps_pledge) 743 return (pledge_fail(p, EPERM, (ni->ni_pledge & ~p->p_p->ps_pledge))); 744 745 /* continue, and check unveil if present */ 746 return (0); 747 } 748 749 /* 750 * Only allow reception of safe file descriptors. 751 */ 752 int 753 pledge_recvfd(struct proc *p, struct file *fp) 754 { 755 struct vnode *vp; 756 757 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 758 return (0); 759 if ((p->p_p->ps_pledge & PLEDGE_RECVFD) == 0) 760 return pledge_fail(p, EPERM, PLEDGE_RECVFD); 761 762 switch (fp->f_type) { 763 case DTYPE_SOCKET: 764 case DTYPE_PIPE: 765 case DTYPE_DMABUF: 766 return (0); 767 case DTYPE_VNODE: 768 vp = fp->f_data; 769 770 if (vp->v_type != VDIR) 771 return (0); 772 } 773 return pledge_fail(p, EINVAL, PLEDGE_RECVFD); 774 } 775 776 /* 777 * Only allow sending of safe file descriptors. 778 */ 779 int 780 pledge_sendfd(struct proc *p, struct file *fp) 781 { 782 struct vnode *vp; 783 784 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 785 return (0); 786 if ((p->p_p->ps_pledge & PLEDGE_SENDFD) == 0) 787 return pledge_fail(p, EPERM, PLEDGE_SENDFD); 788 789 switch (fp->f_type) { 790 case DTYPE_SOCKET: 791 case DTYPE_PIPE: 792 case DTYPE_DMABUF: 793 return (0); 794 case DTYPE_VNODE: 795 vp = fp->f_data; 796 797 if (vp->v_type != VDIR) 798 return (0); 799 break; 800 } 801 return pledge_fail(p, EINVAL, PLEDGE_SENDFD); 802 } 803 804 int 805 pledge_sysctl(struct proc *p, int miblen, int *mib, void *new) 806 { 807 char buf[80]; 808 int i; 809 810 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 811 return (0); 812 813 if (new) 814 return pledge_fail(p, EFAULT, 0); 815 816 /* routing table observation */ 817 if ((p->p_p->ps_pledge & PLEDGE_ROUTE)) { 818 if ((miblen == 6 || miblen == 7) && 819 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 820 mib[2] == 0 && 821 mib[4] == NET_RT_DUMP) 822 return (0); 823 824 if (miblen == 6 && 825 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 826 mib[2] == 0 && 827 (mib[3] == 0 || mib[3] == AF_INET6 || mib[3] == AF_INET) && 828 mib[4] == NET_RT_TABLE) 829 return (0); 830 831 if (miblen == 7 && /* exposes MACs */ 832 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 833 mib[2] == 0 && 834 (mib[3] == 0 || mib[3] == AF_INET6 || mib[3] == AF_INET) && 835 mib[4] == NET_RT_FLAGS && mib[5] == RTF_LLINFO) 836 return (0); 837 } 838 839 if ((p->p_p->ps_pledge & PLEDGE_WROUTE)) { 840 if (miblen == 4 && 841 mib[0] == CTL_NET && mib[1] == PF_INET6 && 842 mib[2] == IPPROTO_IPV6 && mib[3] == IPV6CTL_SOIIKEY) 843 return (0); 844 } 845 846 if (p->p_p->ps_pledge & (PLEDGE_PS | PLEDGE_VMINFO)) { 847 if (miblen == 2 && /* kern.fscale */ 848 mib[0] == CTL_KERN && mib[1] == KERN_FSCALE) 849 return (0); 850 if (miblen == 2 && /* kern.boottime */ 851 mib[0] == CTL_KERN && mib[1] == KERN_BOOTTIME) 852 return (0); 853 if (miblen == 2 && /* kern.consdev */ 854 mib[0] == CTL_KERN && mib[1] == KERN_CONSDEV) 855 return (0); 856 if (miblen == 2 && /* kern.cptime */ 857 mib[0] == CTL_KERN && mib[1] == KERN_CPTIME) 858 return (0); 859 if (miblen == 3 && /* kern.cptime2 */ 860 mib[0] == CTL_KERN && mib[1] == KERN_CPTIME2) 861 return (0); 862 if (miblen == 3 && /* kern.cpustats */ 863 mib[0] == CTL_KERN && mib[1] == KERN_CPUSTATS) 864 return (0); 865 } 866 867 if ((p->p_p->ps_pledge & PLEDGE_PS)) { 868 if (miblen == 4 && /* kern.procargs.* */ 869 mib[0] == CTL_KERN && mib[1] == KERN_PROC_ARGS && 870 (mib[3] == KERN_PROC_ARGV || mib[3] == KERN_PROC_ENV)) 871 return (0); 872 if (miblen == 6 && /* kern.proc.* */ 873 mib[0] == CTL_KERN && mib[1] == KERN_PROC) 874 return (0); 875 if (miblen == 3 && /* kern.proc_cwd.* */ 876 mib[0] == CTL_KERN && mib[1] == KERN_PROC_CWD) 877 return (0); 878 if (miblen == 2 && /* hw.physmem */ 879 mib[0] == CTL_HW && mib[1] == HW_PHYSMEM64) 880 return (0); 881 if (miblen == 2 && /* kern.ccpu */ 882 mib[0] == CTL_KERN && mib[1] == KERN_CCPU) 883 return (0); 884 if (miblen == 2 && /* vm.maxslp */ 885 mib[0] == CTL_VM && mib[1] == VM_MAXSLP) 886 return (0); 887 } 888 889 if ((p->p_p->ps_pledge & PLEDGE_VMINFO)) { 890 if (miblen == 2 && /* vm.uvmexp */ 891 mib[0] == CTL_VM && mib[1] == VM_UVMEXP) 892 return (0); 893 if (miblen == 3 && /* vfs.generic.bcachestat */ 894 mib[0] == CTL_VFS && mib[1] == VFS_GENERIC && 895 mib[2] == VFS_BCACHESTAT) 896 return (0); 897 } 898 899 if ((p->p_p->ps_pledge & (PLEDGE_ROUTE | PLEDGE_INET | PLEDGE_DNS))) { 900 if (miblen == 6 && /* getifaddrs() */ 901 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 902 mib[2] == 0 && 903 (mib[3] == 0 || mib[3] == AF_INET6 || mib[3] == AF_INET) && 904 mib[4] == NET_RT_IFLIST) 905 return (0); 906 } 907 908 if ((p->p_p->ps_pledge & PLEDGE_DISKLABEL)) { 909 if (miblen == 2 && /* kern.rawpartition */ 910 mib[0] == CTL_KERN && 911 mib[1] == KERN_RAWPARTITION) 912 return (0); 913 if (miblen == 2 && /* kern.maxpartitions */ 914 mib[0] == CTL_KERN && 915 mib[1] == KERN_MAXPARTITIONS) 916 return (0); 917 #ifdef CPU_CHR2BLK 918 if (miblen == 3 && /* machdep.chr2blk */ 919 mib[0] == CTL_MACHDEP && 920 mib[1] == CPU_CHR2BLK) 921 return (0); 922 #endif /* CPU_CHR2BLK */ 923 } 924 925 if (miblen >= 3 && /* ntpd(8) to read sensors */ 926 mib[0] == CTL_HW && mib[1] == HW_SENSORS) 927 return (0); 928 929 if (miblen == 6 && /* if_nameindex() */ 930 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 931 mib[2] == 0 && mib[3] == 0 && mib[4] == NET_RT_IFNAMES) 932 return (0); 933 934 if (miblen == 2) { 935 switch (mib[0]) { 936 case CTL_KERN: 937 switch (mib[1]) { 938 case KERN_DOMAINNAME: /* getdomainname() */ 939 case KERN_HOSTNAME: /* gethostname() */ 940 case KERN_OSTYPE: /* uname() */ 941 case KERN_OSRELEASE: /* uname() */ 942 case KERN_OSVERSION: /* uname() */ 943 case KERN_VERSION: /* uname() */ 944 case KERN_CLOCKRATE: /* kern.clockrate */ 945 case KERN_ARGMAX: /* kern.argmax */ 946 case KERN_NGROUPS: /* kern.ngroups */ 947 case KERN_SYSVSHM: /* kern.sysvshm */ 948 case KERN_POSIX1: /* kern.posix1version */ 949 return (0); 950 } 951 break; 952 case CTL_HW: 953 switch (mib[1]) { 954 case HW_MACHINE: /* uname() */ 955 case HW_PAGESIZE: /* getpagesize() */ 956 case HW_NCPU: /* hw.ncpu */ 957 case HW_NCPUONLINE: /* hw.ncpuonline */ 958 return (0); 959 } 960 break; 961 case CTL_VM: 962 switch (mib[1]) { 963 case VM_PSSTRINGS: /* setproctitle() */ 964 case VM_LOADAVG: /* vm.loadavg / getloadavg(3) */ 965 case VM_MALLOC_CONF: /* vm.malloc_conf */ 966 return (0); 967 } 968 break; 969 default: 970 break; 971 } 972 } 973 974 #ifdef CPU_SSE 975 if (miblen == 2 && /* i386 libm tests for SSE */ 976 mib[0] == CTL_MACHDEP && mib[1] == CPU_SSE) 977 return (0); 978 #endif /* CPU_SSE */ 979 980 snprintf(buf, sizeof(buf), "%s(%d): pledge sysctl %d:", 981 p->p_p->ps_comm, p->p_p->ps_pid, miblen); 982 for (i = 0; i < miblen; i++) { 983 char *p = buf + strlen(buf); 984 snprintf(p, sizeof(buf) - (p - buf), " %d", mib[i]); 985 } 986 log(LOG_ERR, "%s\n", buf); 987 988 return pledge_fail(p, EINVAL, 0); 989 } 990 991 int 992 pledge_chown(struct proc *p, uid_t uid, gid_t gid) 993 { 994 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 995 return (0); 996 997 if (p->p_p->ps_pledge & PLEDGE_CHOWNUID) 998 return (0); 999 1000 if (uid != -1 && uid != p->p_ucred->cr_uid) 1001 return (EPERM); 1002 if (gid != -1 && !groupmember(gid, p->p_ucred)) 1003 return (EPERM); 1004 return (0); 1005 } 1006 1007 int 1008 pledge_adjtime(struct proc *p, const void *v) 1009 { 1010 const struct timeval *delta = v; 1011 1012 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1013 return (0); 1014 1015 if ((p->p_p->ps_pledge & PLEDGE_SETTIME)) 1016 return (0); 1017 if (delta) 1018 return (EPERM); 1019 return (0); 1020 } 1021 1022 int 1023 pledge_sendit(struct proc *p, const void *to) 1024 { 1025 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1026 return (0); 1027 1028 if ((p->p_p->ps_pledge & (PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS | PLEDGE_YPACTIVE))) 1029 return (0); /* may use address */ 1030 if (to == NULL) 1031 return (0); /* behaves just like write */ 1032 return pledge_fail(p, EPERM, PLEDGE_INET); 1033 } 1034 1035 int 1036 pledge_ioctl(struct proc *p, long com, struct file *fp) 1037 { 1038 struct vnode *vp = NULL; 1039 int error = EPERM; 1040 1041 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1042 return (0); 1043 1044 /* 1045 * The ioctl's which are always allowed. 1046 */ 1047 switch (com) { 1048 case FIONREAD: 1049 case FIONBIO: 1050 case FIOCLEX: 1051 case FIONCLEX: 1052 return (0); 1053 } 1054 1055 /* fp != NULL was already checked */ 1056 if (fp->f_type == DTYPE_VNODE) { 1057 vp = fp->f_data; 1058 if (vp->v_type == VBAD) 1059 return (ENOTTY); 1060 } 1061 1062 if ((p->p_p->ps_pledge & PLEDGE_INET)) { 1063 switch (com) { 1064 case SIOCATMARK: 1065 case SIOCGIFGROUP: 1066 if (fp->f_type == DTYPE_SOCKET) 1067 return (0); 1068 break; 1069 } 1070 } 1071 1072 #if NBPFILTER > 0 1073 if ((p->p_p->ps_pledge & PLEDGE_BPF)) { 1074 switch (com) { 1075 case BIOCGSTATS: /* bpf: tcpdump privsep on ^C */ 1076 if (fp->f_type == DTYPE_VNODE && 1077 fp->f_ops->fo_ioctl == vn_ioctl && 1078 vp->v_type == VCHR && 1079 cdevsw[major(vp->v_rdev)].d_open == bpfopen) 1080 return (0); 1081 break; 1082 } 1083 } 1084 #endif /* NBPFILTER > 0 */ 1085 1086 if ((p->p_p->ps_pledge & PLEDGE_TAPE)) { 1087 switch (com) { 1088 case MTIOCGET: 1089 case MTIOCTOP: 1090 /* for pax(1) and such, checking tapes... */ 1091 if (fp->f_type == DTYPE_VNODE && 1092 vp->v_type == VCHR) { 1093 if (vp->v_flag & VISTTY) 1094 return (ENOTTY); 1095 else 1096 return (0); 1097 } 1098 break; 1099 } 1100 } 1101 1102 #if NDRM > 0 1103 if ((p->p_p->ps_pledge & PLEDGE_DRM)) { 1104 if ((fp->f_type == DTYPE_VNODE) && 1105 (vp->v_type == VCHR) && 1106 (cdevsw[major(vp->v_rdev)].d_open == drmopen)) { 1107 error = pledge_ioctl_drm(p, com, vp->v_rdev); 1108 if (error == 0) 1109 return 0; 1110 } 1111 } 1112 #endif /* NDRM > 0 */ 1113 1114 #if NAUDIO > 0 1115 if ((p->p_p->ps_pledge & PLEDGE_AUDIO)) { 1116 switch (com) { 1117 case AUDIO_GETPOS: 1118 case AUDIO_GETPAR: 1119 case AUDIO_SETPAR: 1120 case AUDIO_START: 1121 case AUDIO_STOP: 1122 if (fp->f_type == DTYPE_VNODE && 1123 vp->v_type == VCHR && 1124 cdevsw[major(vp->v_rdev)].d_open == audioopen) 1125 return (0); 1126 } 1127 } 1128 #endif /* NAUDIO > 0 */ 1129 1130 if ((p->p_p->ps_pledge & PLEDGE_DISKLABEL)) { 1131 switch (com) { 1132 case DIOCGDINFO: 1133 case DIOCGPDINFO: 1134 case DIOCRLDINFO: 1135 case DIOCWDINFO: 1136 case BIOCDISK: 1137 case BIOCINQ: 1138 case BIOCINSTALLBOOT: 1139 case BIOCVOL: 1140 if (fp->f_type == DTYPE_VNODE && 1141 ((vp->v_type == VCHR && 1142 cdevsw[major(vp->v_rdev)].d_type == D_DISK) || 1143 (vp->v_type == VBLK && 1144 bdevsw[major(vp->v_rdev)].d_type == D_DISK))) 1145 return (0); 1146 break; 1147 case DIOCMAP: 1148 if (fp->f_type == DTYPE_VNODE && 1149 vp->v_type == VCHR && 1150 cdevsw[major(vp->v_rdev)].d_ioctl == diskmapioctl) 1151 return (0); 1152 break; 1153 } 1154 } 1155 1156 #if NVIDEO > 0 1157 if ((p->p_p->ps_pledge & PLEDGE_VIDEO)) { 1158 switch (com) { 1159 case VIDIOC_QUERYCAP: 1160 case VIDIOC_TRY_FMT: 1161 case VIDIOC_ENUM_FMT: 1162 case VIDIOC_S_FMT: 1163 case VIDIOC_QUERYCTRL: 1164 case VIDIOC_G_CTRL: 1165 case VIDIOC_S_CTRL: 1166 case VIDIOC_G_PARM: 1167 case VIDIOC_S_PARM: 1168 case VIDIOC_REQBUFS: 1169 case VIDIOC_QBUF: 1170 case VIDIOC_DQBUF: 1171 case VIDIOC_QUERYBUF: 1172 case VIDIOC_STREAMON: 1173 case VIDIOC_STREAMOFF: 1174 case VIDIOC_ENUM_FRAMESIZES: 1175 case VIDIOC_ENUM_FRAMEINTERVALS: 1176 if (fp->f_type == DTYPE_VNODE && 1177 vp->v_type == VCHR && 1178 cdevsw[major(vp->v_rdev)].d_open == videoopen) 1179 return (0); 1180 break; 1181 } 1182 } 1183 #endif 1184 1185 #if NPF > 0 1186 if ((p->p_p->ps_pledge & PLEDGE_PF)) { 1187 switch (com) { 1188 case DIOCADDRULE: 1189 case DIOCGETSTATUS: 1190 case DIOCNATLOOK: 1191 case DIOCRADDTABLES: 1192 case DIOCRCLRADDRS: 1193 case DIOCRCLRTABLES: 1194 case DIOCRCLRTSTATS: 1195 case DIOCRGETTSTATS: 1196 case DIOCRSETADDRS: 1197 case DIOCXBEGIN: 1198 case DIOCXCOMMIT: 1199 case DIOCKILLSRCNODES: 1200 if ((fp->f_type == DTYPE_VNODE) && 1201 (vp->v_type == VCHR) && 1202 (cdevsw[major(vp->v_rdev)].d_open == pfopen)) 1203 return (0); 1204 break; 1205 } 1206 } 1207 #endif 1208 1209 if ((p->p_p->ps_pledge & PLEDGE_TTY)) { 1210 switch (com) { 1211 #if NPTY > 0 1212 case PTMGET: 1213 if ((p->p_p->ps_pledge & PLEDGE_RPATH) == 0) 1214 break; 1215 if ((p->p_p->ps_pledge & PLEDGE_WPATH) == 0) 1216 break; 1217 if (fp->f_type != DTYPE_VNODE || vp->v_type != VCHR) 1218 break; 1219 if (cdevsw[major(vp->v_rdev)].d_open != ptmopen) 1220 break; 1221 return (0); 1222 case TIOCUCNTL: /* vmd */ 1223 if ((p->p_p->ps_pledge & PLEDGE_RPATH) == 0) 1224 break; 1225 if ((p->p_p->ps_pledge & PLEDGE_WPATH) == 0) 1226 break; 1227 if (cdevsw[major(vp->v_rdev)].d_open != ptcopen) 1228 break; 1229 return (0); 1230 #endif /* NPTY > 0 */ 1231 case TIOCSPGRP: 1232 if ((p->p_p->ps_pledge & PLEDGE_PROC) == 0) 1233 break; 1234 /* FALLTHROUGH */ 1235 case TIOCFLUSH: /* getty, telnet */ 1236 case TIOCSTART: /* emacs, etc */ 1237 case TIOCGPGRP: 1238 case TIOCGETA: 1239 case TIOCGWINSZ: /* ENOTTY return for non-tty */ 1240 case TIOCSTAT: /* csh */ 1241 if (fp->f_type == DTYPE_VNODE && (vp->v_flag & VISTTY)) 1242 return (0); 1243 return (ENOTTY); 1244 case TIOCSWINSZ: 1245 case TIOCEXT: /* mail, libedit .. */ 1246 case TIOCCBRK: /* cu */ 1247 case TIOCSBRK: /* cu */ 1248 case TIOCCDTR: /* cu */ 1249 case TIOCSDTR: /* cu */ 1250 case TIOCEXCL: /* cu */ 1251 case TIOCSETA: /* cu, ... */ 1252 case TIOCSETAW: /* cu, ... */ 1253 case TIOCSETAF: /* tcsetattr TCSAFLUSH, script */ 1254 case TIOCSCTTY: /* forkpty(3), login_tty(3), ... */ 1255 if (fp->f_type == DTYPE_VNODE && (vp->v_flag & VISTTY)) 1256 return (0); 1257 break; 1258 } 1259 } 1260 1261 if ((p->p_p->ps_pledge & PLEDGE_ROUTE)) { 1262 switch (com) { 1263 case SIOCGIFADDR: 1264 case SIOCGIFAFLAG_IN6: 1265 case SIOCGIFALIFETIME_IN6: 1266 case SIOCGIFDESCR: 1267 case SIOCGIFFLAGS: 1268 case SIOCGIFMETRIC: 1269 case SIOCGIFGMEMB: 1270 case SIOCGIFRDOMAIN: 1271 case SIOCGIFDSTADDR_IN6: 1272 case SIOCGIFNETMASK_IN6: 1273 case SIOCGIFXFLAGS: 1274 case SIOCGNBRINFO_IN6: 1275 case SIOCGIFINFO_IN6: 1276 case SIOCGIFMEDIA: 1277 if (fp->f_type == DTYPE_SOCKET) 1278 return (0); 1279 break; 1280 } 1281 } 1282 1283 if ((p->p_p->ps_pledge & PLEDGE_WROUTE)) { 1284 switch (com) { 1285 case SIOCAIFADDR_IN6: 1286 if (fp->f_type == DTYPE_SOCKET) 1287 return (0); 1288 break; 1289 case SIOCSIFMTU: 1290 if (fp->f_type == DTYPE_SOCKET) 1291 return (0); 1292 break; 1293 } 1294 } 1295 1296 #if NVMM > 0 1297 if ((p->p_p->ps_pledge & PLEDGE_VMM)) { 1298 if ((fp->f_type == DTYPE_VNODE) && 1299 (vp->v_type == VCHR) && 1300 (cdevsw[major(vp->v_rdev)].d_open == vmmopen)) { 1301 error = pledge_ioctl_vmm(p, com); 1302 if (error == 0) 1303 return 0; 1304 } 1305 } 1306 #endif 1307 1308 return pledge_fail(p, error, PLEDGE_TTY); 1309 } 1310 1311 int 1312 pledge_sockopt(struct proc *p, int set, int level, int optname) 1313 { 1314 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1315 return (0); 1316 1317 /* Always allow these, which are too common to reject */ 1318 switch (level) { 1319 case SOL_SOCKET: 1320 switch (optname) { 1321 case SO_RCVBUF: 1322 case SO_ERROR: 1323 return 0; 1324 } 1325 break; 1326 } 1327 1328 if ((p->p_p->ps_pledge & (PLEDGE_INET|PLEDGE_UNIX|PLEDGE_DNS|PLEDGE_YPACTIVE)) == 0) 1329 return pledge_fail(p, EPERM, PLEDGE_INET); 1330 /* In use by some service libraries */ 1331 switch (level) { 1332 case SOL_SOCKET: 1333 switch (optname) { 1334 case SO_TIMESTAMP: 1335 return 0; 1336 } 1337 break; 1338 } 1339 1340 /* DNS resolver may do these requests */ 1341 if ((p->p_p->ps_pledge & PLEDGE_DNS)) { 1342 switch (level) { 1343 case IPPROTO_IPV6: 1344 switch (optname) { 1345 case IPV6_RECVPKTINFO: 1346 case IPV6_USE_MIN_MTU: 1347 return (0); 1348 } 1349 } 1350 } 1351 1352 /* YP may do these requests */ 1353 if (p->p_p->ps_pledge & PLEDGE_YPACTIVE) { 1354 switch (level) { 1355 case IPPROTO_IP: 1356 switch (optname) { 1357 case IP_PORTRANGE: 1358 return (0); 1359 } 1360 break; 1361 1362 case IPPROTO_IPV6: 1363 switch (optname) { 1364 case IPV6_PORTRANGE: 1365 return (0); 1366 } 1367 break; 1368 } 1369 } 1370 1371 if ((p->p_p->ps_pledge & (PLEDGE_INET|PLEDGE_UNIX)) == 0) 1372 return pledge_fail(p, EPERM, PLEDGE_INET); 1373 switch (level) { 1374 case SOL_SOCKET: 1375 switch (optname) { 1376 case SO_RTABLE: 1377 return pledge_fail(p, EINVAL, PLEDGE_INET); 1378 } 1379 return (0); 1380 } 1381 1382 if ((p->p_p->ps_pledge & PLEDGE_INET) == 0) 1383 return pledge_fail(p, EPERM, PLEDGE_INET); 1384 switch (level) { 1385 case IPPROTO_TCP: 1386 switch (optname) { 1387 case TCP_NODELAY: 1388 case TCP_MD5SIG: 1389 case TCP_SACK_ENABLE: 1390 case TCP_MAXSEG: 1391 case TCP_NOPUSH: 1392 return (0); 1393 } 1394 break; 1395 case IPPROTO_IP: 1396 switch (optname) { 1397 case IP_OPTIONS: 1398 if (!set) 1399 return (0); 1400 break; 1401 case IP_TOS: 1402 case IP_TTL: 1403 case IP_MINTTL: 1404 case IP_IPDEFTTL: 1405 case IP_PORTRANGE: 1406 case IP_RECVDSTADDR: 1407 case IP_RECVDSTPORT: 1408 return (0); 1409 case IP_MULTICAST_IF: 1410 case IP_MULTICAST_TTL: 1411 case IP_MULTICAST_LOOP: 1412 case IP_ADD_MEMBERSHIP: 1413 case IP_DROP_MEMBERSHIP: 1414 if (p->p_p->ps_pledge & PLEDGE_MCAST) 1415 return (0); 1416 break; 1417 } 1418 break; 1419 case IPPROTO_ICMP: 1420 break; 1421 case IPPROTO_IPV6: 1422 switch (optname) { 1423 case IPV6_TCLASS: 1424 case IPV6_UNICAST_HOPS: 1425 case IPV6_MINHOPCOUNT: 1426 case IPV6_RECVHOPLIMIT: 1427 case IPV6_PORTRANGE: 1428 case IPV6_RECVPKTINFO: 1429 case IPV6_RECVDSTPORT: 1430 case IPV6_V6ONLY: 1431 return (0); 1432 case IPV6_MULTICAST_IF: 1433 case IPV6_MULTICAST_HOPS: 1434 case IPV6_MULTICAST_LOOP: 1435 case IPV6_JOIN_GROUP: 1436 case IPV6_LEAVE_GROUP: 1437 if (p->p_p->ps_pledge & PLEDGE_MCAST) 1438 return (0); 1439 break; 1440 } 1441 break; 1442 case IPPROTO_ICMPV6: 1443 break; 1444 } 1445 return pledge_fail(p, EPERM, PLEDGE_INET); 1446 } 1447 1448 int 1449 pledge_socket(struct proc *p, int domain, unsigned int state) 1450 { 1451 if (! ISSET(p->p_p->ps_flags, PS_PLEDGE)) 1452 return 0; 1453 1454 if (ISSET(state, SS_DNS)) { 1455 if (ISSET(p->p_p->ps_pledge, PLEDGE_DNS)) 1456 return 0; 1457 return pledge_fail(p, EPERM, PLEDGE_DNS); 1458 } 1459 1460 switch (domain) { 1461 case -1: /* accept on any domain */ 1462 return (0); 1463 case AF_INET: 1464 case AF_INET6: 1465 if (ISSET(p->p_p->ps_pledge, PLEDGE_INET) || 1466 ISSET(p->p_p->ps_pledge, PLEDGE_YPACTIVE)) 1467 return 0; 1468 return pledge_fail(p, EPERM, PLEDGE_INET); 1469 1470 case AF_UNIX: 1471 if (ISSET(p->p_p->ps_pledge, PLEDGE_UNIX)) 1472 return 0; 1473 return pledge_fail(p, EPERM, PLEDGE_UNIX); 1474 } 1475 1476 return pledge_fail(p, EINVAL, PLEDGE_INET); 1477 } 1478 1479 int 1480 pledge_flock(struct proc *p) 1481 { 1482 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1483 return (0); 1484 1485 if ((p->p_p->ps_pledge & PLEDGE_FLOCK)) 1486 return (0); 1487 return (pledge_fail(p, EPERM, PLEDGE_FLOCK)); 1488 } 1489 1490 int 1491 pledge_swapctl(struct proc *p) 1492 { 1493 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1494 return (0); 1495 return (EPERM); 1496 } 1497 1498 /* bsearch over pledgereq. return flags value if found, 0 else */ 1499 uint64_t 1500 pledgereq_flags(const char *req_name) 1501 { 1502 int base = 0, cmp, i, lim; 1503 1504 for (lim = nitems(pledgereq); lim != 0; lim >>= 1) { 1505 i = base + (lim >> 1); 1506 cmp = strcmp(req_name, pledgereq[i].name); 1507 if (cmp == 0) 1508 return (pledgereq[i].flags); 1509 if (cmp > 0) { /* not found before, move right */ 1510 base = i + 1; 1511 lim--; 1512 } /* else move left */ 1513 } 1514 return (0); 1515 } 1516 1517 int 1518 pledge_fcntl(struct proc *p, int cmd) 1519 { 1520 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1521 return (0); 1522 if ((p->p_p->ps_pledge & PLEDGE_PROC) == 0 && cmd == F_SETOWN) 1523 return pledge_fail(p, EPERM, PLEDGE_PROC); 1524 return (0); 1525 } 1526 1527 int 1528 pledge_kill(struct proc *p, pid_t pid) 1529 { 1530 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1531 return 0; 1532 if (p->p_p->ps_pledge & PLEDGE_PROC) 1533 return 0; 1534 if (pid == 0 || pid == p->p_p->ps_pid) 1535 return 0; 1536 return pledge_fail(p, EPERM, PLEDGE_PROC); 1537 } 1538 1539 int 1540 pledge_protexec(struct proc *p, int prot) 1541 { 1542 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1543 return 0; 1544 /* Before kbind(2) call, ld.so and crt may create EXEC mappings */ 1545 if (p->p_p->ps_kbind_addr == 0 && p->p_p->ps_kbind_cookie == 0) 1546 return 0; 1547 if (!(p->p_p->ps_pledge & PLEDGE_PROTEXEC) && (prot & PROT_EXEC)) 1548 return pledge_fail(p, EPERM, PLEDGE_PROTEXEC); 1549 return 0; 1550 } 1551 1552 int 1553 canonpath(const char *input, char *buf, size_t bufsize) 1554 { 1555 const char *p; 1556 char *q; 1557 1558 /* can't canon relative paths, don't bother */ 1559 if (input[0] != '/') { 1560 if (strlcpy(buf, input, bufsize) >= bufsize) 1561 return ENAMETOOLONG; 1562 return 0; 1563 } 1564 1565 p = input; 1566 q = buf; 1567 while (*p && (q - buf < bufsize)) { 1568 if (p[0] == '/' && (p[1] == '/' || p[1] == '\0')) { 1569 p += 1; 1570 1571 } else if (p[0] == '/' && p[1] == '.' && 1572 (p[2] == '/' || p[2] == '\0')) { 1573 p += 2; 1574 1575 } else if (p[0] == '/' && p[1] == '.' && p[2] == '.' && 1576 (p[3] == '/' || p[3] == '\0')) { 1577 p += 3; 1578 if (q != buf) /* "/../" at start of buf */ 1579 while (*--q != '/') 1580 continue; 1581 1582 } else { 1583 *q++ = *p++; 1584 } 1585 } 1586 if ((*p == '\0') && (q - buf < bufsize)) { 1587 *q = 0; 1588 return 0; 1589 } else 1590 return ENAMETOOLONG; 1591 } 1592