1 /* $OpenBSD: kern_pledge.c,v 1.252 2019/05/13 22:55:27 beck 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 [SYS___realpath] = PLEDGE_STDIO, /* XXX Fix me Theo! Fix me! */ 257 258 [SYS_adjtime] = PLEDGE_STDIO, /* setting requires "settime" */ 259 [SYS_adjfreq] = PLEDGE_SETTIME, 260 [SYS_settimeofday] = PLEDGE_SETTIME, 261 262 /* 263 * Needed by threaded programs 264 * XXX should we have a new "threads"? 265 */ 266 [SYS___tfork] = PLEDGE_STDIO, 267 [SYS_sched_yield] = PLEDGE_STDIO, 268 [SYS_futex] = PLEDGE_STDIO, 269 [SYS___thrsleep] = PLEDGE_STDIO, 270 [SYS___thrwakeup] = PLEDGE_STDIO, 271 [SYS___threxit] = PLEDGE_STDIO, 272 [SYS___thrsigdivert] = PLEDGE_STDIO, 273 274 [SYS_fork] = PLEDGE_PROC, 275 [SYS_vfork] = PLEDGE_PROC, 276 [SYS_setpgid] = PLEDGE_PROC, 277 [SYS_setsid] = PLEDGE_PROC, 278 279 [SYS_setrlimit] = PLEDGE_PROC | PLEDGE_ID, 280 [SYS_getpriority] = PLEDGE_PROC | PLEDGE_ID, 281 282 [SYS_setpriority] = PLEDGE_PROC | PLEDGE_ID, 283 284 [SYS_setuid] = PLEDGE_ID, 285 [SYS_seteuid] = PLEDGE_ID, 286 [SYS_setreuid] = PLEDGE_ID, 287 [SYS_setresuid] = PLEDGE_ID, 288 [SYS_setgid] = PLEDGE_ID, 289 [SYS_setegid] = PLEDGE_ID, 290 [SYS_setregid] = PLEDGE_ID, 291 [SYS_setresgid] = PLEDGE_ID, 292 [SYS_setgroups] = PLEDGE_ID, 293 [SYS_setlogin] = PLEDGE_ID, 294 295 [SYS_unveil] = PLEDGE_UNVEIL, 296 297 [SYS_execve] = PLEDGE_EXEC, 298 299 [SYS_chdir] = PLEDGE_RPATH, 300 [SYS_openat] = PLEDGE_RPATH | PLEDGE_WPATH, 301 [SYS_fstatat] = PLEDGE_RPATH | PLEDGE_WPATH, 302 [SYS_faccessat] = PLEDGE_RPATH | PLEDGE_WPATH, 303 [SYS_readlinkat] = PLEDGE_RPATH | PLEDGE_WPATH, 304 [SYS_lstat] = PLEDGE_RPATH | PLEDGE_WPATH | PLEDGE_TMPPATH, 305 [SYS_truncate] = PLEDGE_WPATH, 306 [SYS_rename] = PLEDGE_RPATH | PLEDGE_CPATH, 307 [SYS_rmdir] = PLEDGE_CPATH, 308 [SYS_renameat] = PLEDGE_CPATH, 309 [SYS_link] = PLEDGE_CPATH, 310 [SYS_linkat] = PLEDGE_CPATH, 311 [SYS_symlink] = PLEDGE_CPATH, 312 [SYS_symlinkat] = PLEDGE_CPATH, 313 [SYS_unlink] = PLEDGE_CPATH | PLEDGE_TMPPATH, 314 [SYS_unlinkat] = PLEDGE_CPATH, 315 [SYS_mkdir] = PLEDGE_CPATH, 316 [SYS_mkdirat] = PLEDGE_CPATH, 317 318 [SYS_mkfifo] = PLEDGE_DPATH, 319 [SYS_mkfifoat] = PLEDGE_DPATH, 320 [SYS_mknod] = PLEDGE_DPATH, 321 [SYS_mknodat] = PLEDGE_DPATH, 322 323 [SYS_revoke] = PLEDGE_TTY, /* also requires PLEDGE_RPATH */ 324 325 /* 326 * Classify as RPATH|WPATH, because of path information leakage. 327 * WPATH due to unknown use of mk*temp(3) on non-/tmp paths.. 328 */ 329 [SYS___getcwd] = PLEDGE_RPATH | PLEDGE_WPATH, 330 331 /* Classify as RPATH, because these leak path information */ 332 [SYS_getdents] = PLEDGE_RPATH, 333 [SYS_getfsstat] = PLEDGE_RPATH, 334 [SYS_statfs] = PLEDGE_RPATH, 335 [SYS_fstatfs] = PLEDGE_RPATH, 336 [SYS_pathconf] = PLEDGE_RPATH, 337 338 [SYS_utimes] = PLEDGE_FATTR, 339 [SYS_futimes] = PLEDGE_FATTR, 340 [SYS_utimensat] = PLEDGE_FATTR, 341 [SYS_futimens] = PLEDGE_FATTR, 342 [SYS_chmod] = PLEDGE_FATTR, 343 [SYS_fchmod] = PLEDGE_FATTR, 344 [SYS_fchmodat] = PLEDGE_FATTR, 345 [SYS_chflags] = PLEDGE_FATTR, 346 [SYS_chflagsat] = PLEDGE_FATTR, 347 [SYS_fchflags] = PLEDGE_FATTR, 348 349 [SYS_chown] = PLEDGE_CHOWN, 350 [SYS_fchownat] = PLEDGE_CHOWN, 351 [SYS_lchown] = PLEDGE_CHOWN, 352 [SYS_fchown] = PLEDGE_CHOWN, 353 354 [SYS_socket] = PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS | PLEDGE_YPACTIVE, 355 [SYS_connect] = PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS | PLEDGE_YPACTIVE, 356 [SYS_bind] = PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS | PLEDGE_YPACTIVE, 357 [SYS_getsockname] = PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS | PLEDGE_YPACTIVE, 358 359 [SYS_listen] = PLEDGE_INET | PLEDGE_UNIX, 360 [SYS_accept4] = PLEDGE_INET | PLEDGE_UNIX, 361 [SYS_accept] = PLEDGE_INET | PLEDGE_UNIX, 362 [SYS_getpeername] = PLEDGE_INET | PLEDGE_UNIX, 363 364 [SYS_flock] = PLEDGE_FLOCK | PLEDGE_YPACTIVE, 365 366 [SYS_swapctl] = PLEDGE_VMINFO, /* XXX should limit to "get" operations */ 367 }; 368 369 static const struct { 370 char *name; 371 uint64_t flags; 372 } pledgereq[] = { 373 { "audio", PLEDGE_AUDIO }, 374 { "bpf", PLEDGE_BPF }, 375 { "chown", PLEDGE_CHOWN | PLEDGE_CHOWNUID }, 376 { "cpath", PLEDGE_CPATH }, 377 { "disklabel", PLEDGE_DISKLABEL }, 378 { "dns", PLEDGE_DNS }, 379 { "dpath", PLEDGE_DPATH }, 380 { "drm", PLEDGE_DRM }, 381 { "error", PLEDGE_ERROR }, 382 { "exec", PLEDGE_EXEC }, 383 { "fattr", PLEDGE_FATTR | PLEDGE_CHOWN }, 384 { "flock", PLEDGE_FLOCK }, 385 { "getpw", PLEDGE_GETPW }, 386 { "id", PLEDGE_ID }, 387 { "inet", PLEDGE_INET }, 388 { "mcast", PLEDGE_MCAST }, 389 { "pf", PLEDGE_PF }, 390 { "proc", PLEDGE_PROC }, 391 { "prot_exec", PLEDGE_PROTEXEC }, 392 { "ps", PLEDGE_PS }, 393 { "recvfd", PLEDGE_RECVFD }, 394 { "route", PLEDGE_ROUTE }, 395 { "rpath", PLEDGE_RPATH }, 396 { "sendfd", PLEDGE_SENDFD }, 397 { "settime", PLEDGE_SETTIME }, 398 { "stdio", PLEDGE_STDIO }, 399 { "tape", PLEDGE_TAPE }, 400 { "tmppath", PLEDGE_TMPPATH }, 401 { "tty", PLEDGE_TTY }, 402 { "unix", PLEDGE_UNIX }, 403 { "unveil", PLEDGE_UNVEIL }, 404 { "video", PLEDGE_VIDEO }, 405 { "vminfo", PLEDGE_VMINFO }, 406 { "vmm", PLEDGE_VMM }, 407 { "wpath", PLEDGE_WPATH }, 408 { "wroute", PLEDGE_WROUTE }, 409 }; 410 411 int 412 parsepledges(struct proc *p, const char *kname, const char *promises, u_int64_t *fp) 413 { 414 size_t rbuflen; 415 char *rbuf, *rp, *pn; 416 u_int64_t flags = 0, f; 417 int error; 418 419 rbuf = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 420 error = copyinstr(promises, rbuf, MAXPATHLEN, 421 &rbuflen); 422 if (error) { 423 free(rbuf, M_TEMP, MAXPATHLEN); 424 return (error); 425 } 426 #ifdef KTRACE 427 if (KTRPOINT(p, KTR_STRUCT)) 428 ktrstruct(p, kname, rbuf, rbuflen-1); 429 #endif 430 431 for (rp = rbuf; rp && *rp; rp = pn) { 432 pn = strchr(rp, ' '); /* find terminator */ 433 if (pn) { 434 while (*pn == ' ') 435 *pn++ = '\0'; 436 } 437 if ((f = pledgereq_flags(rp)) == 0) { 438 free(rbuf, M_TEMP, MAXPATHLEN); 439 return (EINVAL); 440 } 441 flags |= f; 442 } 443 free(rbuf, M_TEMP, MAXPATHLEN); 444 *fp = flags; 445 return 0; 446 } 447 448 int 449 sys_pledge(struct proc *p, void *v, register_t *retval) 450 { 451 struct sys_pledge_args /* { 452 syscallarg(const char *)promises; 453 syscallarg(const char *)execpromises; 454 } */ *uap = v; 455 struct process *pr = p->p_p; 456 uint64_t promises, execpromises; 457 int error; 458 459 if (SCARG(uap, promises)) { 460 error = parsepledges(p, "pledgereq", 461 SCARG(uap, promises), &promises); 462 if (error) 463 return (error); 464 465 /* In "error" mode, ignore promise increase requests, 466 * but accept promise decrease requests */ 467 if (ISSET(pr->ps_flags, PS_PLEDGE) && 468 (pr->ps_pledge & PLEDGE_ERROR)) 469 promises &= (pr->ps_pledge & PLEDGE_USERSET); 470 471 /* Only permit reductions */ 472 if (ISSET(pr->ps_flags, PS_PLEDGE) && 473 (((promises | pr->ps_pledge) != pr->ps_pledge))) 474 return (EPERM); 475 } 476 if (SCARG(uap, execpromises)) { 477 error = parsepledges(p, "pledgeexecreq", 478 SCARG(uap, execpromises), &execpromises); 479 if (error) 480 return (error); 481 482 /* Only permit reductions */ 483 if (ISSET(pr->ps_flags, PS_EXECPLEDGE) && 484 (((execpromises | pr->ps_execpledge) != pr->ps_execpledge))) 485 return (EPERM); 486 } 487 488 if (SCARG(uap, promises)) { 489 pr->ps_pledge = promises; 490 pr->ps_flags |= PS_PLEDGE; 491 /* 492 * Kill off unveil and drop unveil vnode refs if we no 493 * longer are holding any path-accessing pledge 494 */ 495 if ((pr->ps_pledge & (PLEDGE_RPATH | PLEDGE_WPATH | 496 PLEDGE_CPATH | PLEDGE_DPATH | PLEDGE_TMPPATH | PLEDGE_EXEC | 497 PLEDGE_UNIX | PLEDGE_UNVEIL)) == 0) 498 unveil_destroy(pr); 499 } 500 if (SCARG(uap, execpromises)) { 501 pr->ps_execpledge = execpromises; 502 pr->ps_flags |= PS_EXECPLEDGE; 503 } 504 return (0); 505 } 506 507 int 508 pledge_syscall(struct proc *p, int code, uint64_t *tval) 509 { 510 p->p_pledge_syscall = code; 511 *tval = 0; 512 513 if (code < 0 || code > SYS_MAXSYSCALL - 1) 514 return (EINVAL); 515 516 if (pledge_syscalls[code] == PLEDGE_ALWAYS) 517 return (0); 518 519 if (p->p_p->ps_pledge & pledge_syscalls[code]) 520 return (0); 521 522 *tval = pledge_syscalls[code]; 523 return (EPERM); 524 } 525 526 int 527 pledge_fail(struct proc *p, int error, uint64_t code) 528 { 529 char *codes = ""; 530 int i; 531 struct sigaction sa; 532 533 /* Print first matching pledge */ 534 for (i = 0; code && pledgenames[i].bits != 0; i++) 535 if (pledgenames[i].bits & code) { 536 codes = pledgenames[i].name; 537 break; 538 } 539 #ifdef KTRACE 540 if (KTRPOINT(p, KTR_PLEDGE)) 541 ktrpledge(p, error, code, p->p_pledge_syscall); 542 #endif 543 if (p->p_p->ps_pledge & PLEDGE_ERROR) 544 return (ENOSYS); 545 546 KERNEL_LOCK(); 547 log(LOG_ERR, "%s[%d]: pledge \"%s\", syscall %d\n", 548 p->p_p->ps_comm, p->p_p->ps_pid, codes, p->p_pledge_syscall); 549 p->p_p->ps_acflag |= APLEDGE; 550 551 /* Send uncatchable SIGABRT for coredump */ 552 memset(&sa, 0, sizeof sa); 553 sa.sa_handler = SIG_DFL; 554 setsigvec(p, SIGABRT, &sa); 555 atomic_clearbits_int(&p->p_sigmask, sigmask(SIGABRT)); 556 psignal(p, SIGABRT); 557 558 p->p_p->ps_pledge = 0; /* Disable all PLEDGE_ flags */ 559 KERNEL_UNLOCK(); 560 return (error); 561 } 562 563 /* 564 * Need to make it more obvious that one cannot get through here 565 * without the right flags set 566 */ 567 int 568 pledge_namei(struct proc *p, struct nameidata *ni, char *origpath) 569 { 570 char path[PATH_MAX]; 571 int error; 572 573 if ((p->p_p->ps_flags & PS_PLEDGE) == 0 || 574 (p->p_p->ps_flags & PS_COREDUMP)) 575 return (0); 576 577 if (ni->ni_pledge == 0) 578 panic("pledge_namei: ni_pledge"); 579 580 /* 581 * We set the BYPASSUNVEIL flag to skip unveil checks 582 * as necessary 583 */ 584 585 /* Doing a permitted execve() */ 586 if ((ni->ni_pledge & PLEDGE_EXEC) && 587 (p->p_p->ps_pledge & PLEDGE_EXEC)) 588 return (0); 589 590 error = canonpath(origpath, path, sizeof(path)); 591 if (error) 592 return (error); 593 594 /* Detect what looks like a mkstemp(3) family operation */ 595 if ((p->p_p->ps_pledge & PLEDGE_TMPPATH) && 596 (p->p_pledge_syscall == SYS_open) && 597 (ni->ni_pledge & PLEDGE_CPATH) && 598 strncmp(path, "/tmp/", sizeof("/tmp/") - 1) == 0) { 599 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 600 return (0); 601 } 602 603 /* Allow unlinking of a mkstemp(3) file... 604 * Good opportunity for strict checks here. 605 */ 606 if ((p->p_p->ps_pledge & PLEDGE_TMPPATH) && 607 (p->p_pledge_syscall == SYS_unlink) && 608 strncmp(path, "/tmp/", sizeof("/tmp/") - 1) == 0) { 609 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 610 return (0); 611 } 612 613 /* Whitelisted paths */ 614 switch (p->p_pledge_syscall) { 615 case SYS_access: 616 /* tzset() needs this. */ 617 if (ni->ni_pledge == PLEDGE_RPATH && 618 strcmp(path, "/etc/localtime") == 0) { 619 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 620 return (0); 621 } 622 623 /* when avoiding YP mode, getpw* functions touch this */ 624 if (ni->ni_pledge == PLEDGE_RPATH && 625 strcmp(path, "/var/run/ypbind.lock") == 0) { 626 if ((p->p_p->ps_pledge & PLEDGE_GETPW) || 627 (ni->ni_unveil == UNVEIL_INSPECT)) { 628 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 629 return (0); 630 } else 631 return (pledge_fail(p, error, PLEDGE_GETPW)); 632 } 633 break; 634 case SYS_open: 635 /* daemon(3) or other such functions */ 636 if ((ni->ni_pledge & ~(PLEDGE_RPATH | PLEDGE_WPATH)) == 0 && 637 strcmp(path, "/dev/null") == 0) { 638 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 639 return (0); 640 } 641 642 /* readpassphrase(3), getpass(3) */ 643 if ((p->p_p->ps_pledge & PLEDGE_TTY) && 644 (ni->ni_pledge & ~(PLEDGE_RPATH | PLEDGE_WPATH)) == 0 && 645 strcmp(path, "/dev/tty") == 0) { 646 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 647 return (0); 648 } 649 650 /* getpw* and friends need a few files */ 651 if ((ni->ni_pledge == PLEDGE_RPATH) && 652 (p->p_p->ps_pledge & PLEDGE_GETPW)) { 653 if (strcmp(path, "/etc/spwd.db") == 0) 654 return (EPERM); /* don't call pledge_fail */ 655 if (strcmp(path, "/etc/pwd.db") == 0) { 656 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 657 return (0); 658 } 659 if (strcmp(path, "/etc/group") == 0) { 660 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 661 return (0); 662 } 663 if (strcmp(path, "/etc/netid") == 0) { 664 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 665 return (0); 666 } 667 } 668 669 /* DNS needs /etc/{resolv.conf,hosts,services}. */ 670 if ((ni->ni_pledge == PLEDGE_RPATH) && 671 (p->p_p->ps_pledge & PLEDGE_DNS)) { 672 if (strcmp(path, "/etc/resolv.conf") == 0) { 673 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 674 return (0); 675 } 676 if (strcmp(path, "/etc/hosts") == 0) { 677 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 678 return (0); 679 } 680 if (strcmp(path, "/etc/services") == 0) { 681 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 682 return (0); 683 } 684 } 685 686 if ((ni->ni_pledge == PLEDGE_RPATH) && 687 (p->p_p->ps_pledge & PLEDGE_GETPW)) { 688 if (strcmp(path, "/var/run/ypbind.lock") == 0) { 689 /* 690 * XXX 691 * The current hack for YP support in "getpw" 692 * is to enable some "inet" features until 693 * next pledge call. This is not considered 694 * worse than pre-pledge, but is a work in 695 * progress, needing a clever design. 696 */ 697 p->p_p->ps_pledge |= PLEDGE_YPACTIVE; 698 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 699 return (0); 700 } 701 if (strncmp(path, "/var/yp/binding/", 702 sizeof("/var/yp/binding/") - 1) == 0) { 703 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 704 return (0); 705 } 706 } 707 708 /* tzset() needs these. */ 709 if ((ni->ni_pledge == PLEDGE_RPATH) && 710 strncmp(path, "/usr/share/zoneinfo/", 711 sizeof("/usr/share/zoneinfo/") - 1) == 0) { 712 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 713 return (0); 714 } 715 if ((ni->ni_pledge == PLEDGE_RPATH) && 716 strcmp(path, "/etc/localtime") == 0) { 717 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 718 return (0); 719 } 720 721 break; 722 case SYS_readlink: 723 /* Allow /etc/malloc.conf for malloc(3). */ 724 if ((ni->ni_pledge == PLEDGE_RPATH) && 725 strcmp(path, "/etc/malloc.conf") == 0) { 726 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 727 return (0); 728 } 729 break; 730 case SYS_stat: 731 /* DNS needs /etc/resolv.conf. */ 732 if ((ni->ni_pledge == PLEDGE_RPATH) && 733 (p->p_p->ps_pledge & PLEDGE_DNS) && 734 strcmp(path, "/etc/resolv.conf") == 0) { 735 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 736 return (0); 737 } 738 break; 739 } 740 741 /* 742 * Ensure each flag of ni_pledge has counterpart allowing it in 743 * ps_pledge. 744 */ 745 if (ni->ni_pledge & ~p->p_p->ps_pledge) 746 return (pledge_fail(p, EPERM, (ni->ni_pledge & ~p->p_p->ps_pledge))); 747 748 /* continue, and check unveil if present */ 749 return (0); 750 } 751 752 /* 753 * Only allow reception of safe file descriptors. 754 */ 755 int 756 pledge_recvfd(struct proc *p, struct file *fp) 757 { 758 struct vnode *vp; 759 760 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 761 return (0); 762 if ((p->p_p->ps_pledge & PLEDGE_RECVFD) == 0) 763 return pledge_fail(p, EPERM, PLEDGE_RECVFD); 764 765 switch (fp->f_type) { 766 case DTYPE_SOCKET: 767 case DTYPE_PIPE: 768 case DTYPE_DMABUF: 769 return (0); 770 case DTYPE_VNODE: 771 vp = fp->f_data; 772 773 if (vp->v_type != VDIR) 774 return (0); 775 } 776 return pledge_fail(p, EINVAL, PLEDGE_RECVFD); 777 } 778 779 /* 780 * Only allow sending of safe file descriptors. 781 */ 782 int 783 pledge_sendfd(struct proc *p, struct file *fp) 784 { 785 struct vnode *vp; 786 787 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 788 return (0); 789 if ((p->p_p->ps_pledge & PLEDGE_SENDFD) == 0) 790 return pledge_fail(p, EPERM, PLEDGE_SENDFD); 791 792 switch (fp->f_type) { 793 case DTYPE_SOCKET: 794 case DTYPE_PIPE: 795 case DTYPE_DMABUF: 796 return (0); 797 case DTYPE_VNODE: 798 vp = fp->f_data; 799 800 if (vp->v_type != VDIR) 801 return (0); 802 break; 803 } 804 return pledge_fail(p, EINVAL, PLEDGE_SENDFD); 805 } 806 807 int 808 pledge_sysctl(struct proc *p, int miblen, int *mib, void *new) 809 { 810 char buf[80]; 811 int i; 812 813 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 814 return (0); 815 816 if (new) 817 return pledge_fail(p, EFAULT, 0); 818 819 /* routing table observation */ 820 if ((p->p_p->ps_pledge & PLEDGE_ROUTE)) { 821 if ((miblen == 6 || miblen == 7) && 822 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 823 mib[2] == 0 && 824 mib[4] == NET_RT_DUMP) 825 return (0); 826 827 if (miblen == 6 && 828 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 829 mib[2] == 0 && 830 (mib[3] == 0 || mib[3] == AF_INET6 || mib[3] == AF_INET) && 831 mib[4] == NET_RT_TABLE) 832 return (0); 833 834 if (miblen == 7 && /* exposes MACs */ 835 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 836 mib[2] == 0 && 837 (mib[3] == 0 || mib[3] == AF_INET6 || mib[3] == AF_INET) && 838 mib[4] == NET_RT_FLAGS && mib[5] == RTF_LLINFO) 839 return (0); 840 } 841 842 if ((p->p_p->ps_pledge & PLEDGE_WROUTE)) { 843 if (miblen == 4 && 844 mib[0] == CTL_NET && mib[1] == PF_INET6 && 845 mib[2] == IPPROTO_IPV6 && mib[3] == IPV6CTL_SOIIKEY) 846 return (0); 847 } 848 849 if (p->p_p->ps_pledge & (PLEDGE_PS | PLEDGE_VMINFO)) { 850 if (miblen == 2 && /* kern.fscale */ 851 mib[0] == CTL_KERN && mib[1] == KERN_FSCALE) 852 return (0); 853 if (miblen == 2 && /* kern.boottime */ 854 mib[0] == CTL_KERN && mib[1] == KERN_BOOTTIME) 855 return (0); 856 if (miblen == 2 && /* kern.consdev */ 857 mib[0] == CTL_KERN && mib[1] == KERN_CONSDEV) 858 return (0); 859 if (miblen == 2 && /* kern.cptime */ 860 mib[0] == CTL_KERN && mib[1] == KERN_CPTIME) 861 return (0); 862 if (miblen == 3 && /* kern.cptime2 */ 863 mib[0] == CTL_KERN && mib[1] == KERN_CPTIME2) 864 return (0); 865 if (miblen == 3 && /* kern.cpustats */ 866 mib[0] == CTL_KERN && mib[1] == KERN_CPUSTATS) 867 return (0); 868 } 869 870 if ((p->p_p->ps_pledge & PLEDGE_PS)) { 871 if (miblen == 4 && /* kern.procargs.* */ 872 mib[0] == CTL_KERN && mib[1] == KERN_PROC_ARGS && 873 (mib[3] == KERN_PROC_ARGV || mib[3] == KERN_PROC_ENV)) 874 return (0); 875 if (miblen == 6 && /* kern.proc.* */ 876 mib[0] == CTL_KERN && mib[1] == KERN_PROC) 877 return (0); 878 if (miblen == 3 && /* kern.proc_cwd.* */ 879 mib[0] == CTL_KERN && mib[1] == KERN_PROC_CWD) 880 return (0); 881 if (miblen == 2 && /* hw.physmem */ 882 mib[0] == CTL_HW && mib[1] == HW_PHYSMEM64) 883 return (0); 884 if (miblen == 2 && /* kern.ccpu */ 885 mib[0] == CTL_KERN && mib[1] == KERN_CCPU) 886 return (0); 887 if (miblen == 2 && /* vm.maxslp */ 888 mib[0] == CTL_VM && mib[1] == VM_MAXSLP) 889 return (0); 890 } 891 892 if ((p->p_p->ps_pledge & PLEDGE_VMINFO)) { 893 if (miblen == 2 && /* vm.uvmexp */ 894 mib[0] == CTL_VM && mib[1] == VM_UVMEXP) 895 return (0); 896 if (miblen == 3 && /* vfs.generic.bcachestat */ 897 mib[0] == CTL_VFS && mib[1] == VFS_GENERIC && 898 mib[2] == VFS_BCACHESTAT) 899 return (0); 900 } 901 902 if ((p->p_p->ps_pledge & (PLEDGE_ROUTE | PLEDGE_INET | PLEDGE_DNS))) { 903 if (miblen == 6 && /* getifaddrs() */ 904 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 905 mib[2] == 0 && 906 (mib[3] == 0 || mib[3] == AF_INET6 || mib[3] == AF_INET) && 907 mib[4] == NET_RT_IFLIST) 908 return (0); 909 } 910 911 if ((p->p_p->ps_pledge & PLEDGE_DISKLABEL)) { 912 if (miblen == 2 && /* kern.rawpartition */ 913 mib[0] == CTL_KERN && 914 mib[1] == KERN_RAWPARTITION) 915 return (0); 916 if (miblen == 2 && /* kern.maxpartitions */ 917 mib[0] == CTL_KERN && 918 mib[1] == KERN_MAXPARTITIONS) 919 return (0); 920 #ifdef CPU_CHR2BLK 921 if (miblen == 3 && /* machdep.chr2blk */ 922 mib[0] == CTL_MACHDEP && 923 mib[1] == CPU_CHR2BLK) 924 return (0); 925 #endif /* CPU_CHR2BLK */ 926 } 927 928 if (miblen >= 3 && /* ntpd(8) to read sensors */ 929 mib[0] == CTL_HW && mib[1] == HW_SENSORS) 930 return (0); 931 932 if (miblen == 6 && /* if_nameindex() */ 933 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 934 mib[2] == 0 && mib[3] == 0 && mib[4] == NET_RT_IFNAMES) 935 return (0); 936 937 if (miblen == 2) { 938 switch (mib[0]) { 939 case CTL_KERN: 940 switch (mib[1]) { 941 case KERN_DOMAINNAME: /* getdomainname() */ 942 case KERN_HOSTNAME: /* gethostname() */ 943 case KERN_OSTYPE: /* uname() */ 944 case KERN_OSRELEASE: /* uname() */ 945 case KERN_OSVERSION: /* uname() */ 946 case KERN_VERSION: /* uname() */ 947 case KERN_CLOCKRATE: /* kern.clockrate */ 948 case KERN_ARGMAX: /* kern.argmax */ 949 case KERN_NGROUPS: /* kern.ngroups */ 950 case KERN_SYSVSHM: /* kern.sysvshm */ 951 case KERN_POSIX1: /* kern.posix1version */ 952 return (0); 953 } 954 break; 955 case CTL_HW: 956 switch (mib[1]) { 957 case HW_MACHINE: /* uname() */ 958 case HW_PAGESIZE: /* getpagesize() */ 959 case HW_NCPU: /* hw.ncpu */ 960 case HW_NCPUONLINE: /* hw.ncpuonline */ 961 return (0); 962 } 963 break; 964 case CTL_VM: 965 switch (mib[1]) { 966 case VM_PSSTRINGS: /* setproctitle() */ 967 case VM_LOADAVG: /* vm.loadavg / getloadavg(3) */ 968 case VM_MALLOC_CONF: /* vm.malloc_conf */ 969 return (0); 970 } 971 break; 972 default: 973 break; 974 } 975 } 976 977 #ifdef CPU_SSE 978 if (miblen == 2 && /* i386 libm tests for SSE */ 979 mib[0] == CTL_MACHDEP && mib[1] == CPU_SSE) 980 return (0); 981 #endif /* CPU_SSE */ 982 983 snprintf(buf, sizeof(buf), "%s(%d): pledge sysctl %d:", 984 p->p_p->ps_comm, p->p_p->ps_pid, miblen); 985 for (i = 0; i < miblen; i++) { 986 char *p = buf + strlen(buf); 987 snprintf(p, sizeof(buf) - (p - buf), " %d", mib[i]); 988 } 989 log(LOG_ERR, "%s\n", buf); 990 991 return pledge_fail(p, EINVAL, 0); 992 } 993 994 int 995 pledge_chown(struct proc *p, uid_t uid, gid_t gid) 996 { 997 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 998 return (0); 999 1000 if (p->p_p->ps_pledge & PLEDGE_CHOWNUID) 1001 return (0); 1002 1003 if (uid != -1 && uid != p->p_ucred->cr_uid) 1004 return (EPERM); 1005 if (gid != -1 && !groupmember(gid, p->p_ucred)) 1006 return (EPERM); 1007 return (0); 1008 } 1009 1010 int 1011 pledge_adjtime(struct proc *p, const void *v) 1012 { 1013 const struct timeval *delta = v; 1014 1015 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1016 return (0); 1017 1018 if ((p->p_p->ps_pledge & PLEDGE_SETTIME)) 1019 return (0); 1020 if (delta) 1021 return (EPERM); 1022 return (0); 1023 } 1024 1025 int 1026 pledge_sendit(struct proc *p, const void *to) 1027 { 1028 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1029 return (0); 1030 1031 if ((p->p_p->ps_pledge & (PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS | PLEDGE_YPACTIVE))) 1032 return (0); /* may use address */ 1033 if (to == NULL) 1034 return (0); /* behaves just like write */ 1035 return pledge_fail(p, EPERM, PLEDGE_INET); 1036 } 1037 1038 int 1039 pledge_ioctl(struct proc *p, long com, struct file *fp) 1040 { 1041 struct vnode *vp = NULL; 1042 int error = EPERM; 1043 1044 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1045 return (0); 1046 1047 /* 1048 * The ioctl's which are always allowed. 1049 */ 1050 switch (com) { 1051 case FIONREAD: 1052 case FIONBIO: 1053 case FIOCLEX: 1054 case FIONCLEX: 1055 return (0); 1056 } 1057 1058 /* fp != NULL was already checked */ 1059 if (fp->f_type == DTYPE_VNODE) { 1060 vp = fp->f_data; 1061 if (vp->v_type == VBAD) 1062 return (ENOTTY); 1063 } 1064 1065 if ((p->p_p->ps_pledge & PLEDGE_INET)) { 1066 switch (com) { 1067 case SIOCATMARK: 1068 case SIOCGIFGROUP: 1069 if (fp->f_type == DTYPE_SOCKET) 1070 return (0); 1071 break; 1072 } 1073 } 1074 1075 #if NBPFILTER > 0 1076 if ((p->p_p->ps_pledge & PLEDGE_BPF)) { 1077 switch (com) { 1078 case BIOCGSTATS: /* bpf: tcpdump privsep on ^C */ 1079 if (fp->f_type == DTYPE_VNODE && 1080 fp->f_ops->fo_ioctl == vn_ioctl && 1081 vp->v_type == VCHR && 1082 cdevsw[major(vp->v_rdev)].d_open == bpfopen) 1083 return (0); 1084 break; 1085 } 1086 } 1087 #endif /* NBPFILTER > 0 */ 1088 1089 if ((p->p_p->ps_pledge & PLEDGE_TAPE)) { 1090 switch (com) { 1091 case MTIOCGET: 1092 case MTIOCTOP: 1093 /* for pax(1) and such, checking tapes... */ 1094 if (fp->f_type == DTYPE_VNODE && 1095 vp->v_type == VCHR) { 1096 if (vp->v_flag & VISTTY) 1097 return (ENOTTY); 1098 else 1099 return (0); 1100 } 1101 break; 1102 } 1103 } 1104 1105 #if NDRM > 0 1106 if ((p->p_p->ps_pledge & PLEDGE_DRM)) { 1107 if ((fp->f_type == DTYPE_VNODE) && 1108 (vp->v_type == VCHR) && 1109 (cdevsw[major(vp->v_rdev)].d_open == drmopen)) { 1110 error = pledge_ioctl_drm(p, com, vp->v_rdev); 1111 if (error == 0) 1112 return 0; 1113 } 1114 } 1115 #endif /* NDRM > 0 */ 1116 1117 #if NAUDIO > 0 1118 if ((p->p_p->ps_pledge & PLEDGE_AUDIO)) { 1119 switch (com) { 1120 case AUDIO_GETPOS: 1121 case AUDIO_GETPAR: 1122 case AUDIO_SETPAR: 1123 case AUDIO_START: 1124 case AUDIO_STOP: 1125 if (fp->f_type == DTYPE_VNODE && 1126 vp->v_type == VCHR && 1127 cdevsw[major(vp->v_rdev)].d_open == audioopen) 1128 return (0); 1129 } 1130 } 1131 #endif /* NAUDIO > 0 */ 1132 1133 if ((p->p_p->ps_pledge & PLEDGE_DISKLABEL)) { 1134 switch (com) { 1135 case DIOCGDINFO: 1136 case DIOCGPDINFO: 1137 case DIOCRLDINFO: 1138 case DIOCWDINFO: 1139 case BIOCDISK: 1140 case BIOCINQ: 1141 case BIOCINSTALLBOOT: 1142 case BIOCVOL: 1143 if (fp->f_type == DTYPE_VNODE && 1144 ((vp->v_type == VCHR && 1145 cdevsw[major(vp->v_rdev)].d_type == D_DISK) || 1146 (vp->v_type == VBLK && 1147 bdevsw[major(vp->v_rdev)].d_type == D_DISK))) 1148 return (0); 1149 break; 1150 case DIOCMAP: 1151 if (fp->f_type == DTYPE_VNODE && 1152 vp->v_type == VCHR && 1153 cdevsw[major(vp->v_rdev)].d_ioctl == diskmapioctl) 1154 return (0); 1155 break; 1156 } 1157 } 1158 1159 #if NVIDEO > 0 1160 if ((p->p_p->ps_pledge & PLEDGE_VIDEO)) { 1161 switch (com) { 1162 case VIDIOC_QUERYCAP: 1163 case VIDIOC_TRY_FMT: 1164 case VIDIOC_ENUM_FMT: 1165 case VIDIOC_S_FMT: 1166 case VIDIOC_QUERYCTRL: 1167 case VIDIOC_G_CTRL: 1168 case VIDIOC_S_CTRL: 1169 case VIDIOC_G_PARM: 1170 case VIDIOC_S_PARM: 1171 case VIDIOC_REQBUFS: 1172 case VIDIOC_QBUF: 1173 case VIDIOC_DQBUF: 1174 case VIDIOC_QUERYBUF: 1175 case VIDIOC_STREAMON: 1176 case VIDIOC_STREAMOFF: 1177 case VIDIOC_ENUM_FRAMESIZES: 1178 case VIDIOC_ENUM_FRAMEINTERVALS: 1179 if (fp->f_type == DTYPE_VNODE && 1180 vp->v_type == VCHR && 1181 cdevsw[major(vp->v_rdev)].d_open == videoopen) 1182 return (0); 1183 break; 1184 } 1185 } 1186 #endif 1187 1188 #if NPF > 0 1189 if ((p->p_p->ps_pledge & PLEDGE_PF)) { 1190 switch (com) { 1191 case DIOCADDRULE: 1192 case DIOCGETSTATUS: 1193 case DIOCNATLOOK: 1194 case DIOCRADDTABLES: 1195 case DIOCRCLRADDRS: 1196 case DIOCRCLRTABLES: 1197 case DIOCRCLRTSTATS: 1198 case DIOCRGETTSTATS: 1199 case DIOCRSETADDRS: 1200 case DIOCXBEGIN: 1201 case DIOCXCOMMIT: 1202 case DIOCKILLSRCNODES: 1203 if ((fp->f_type == DTYPE_VNODE) && 1204 (vp->v_type == VCHR) && 1205 (cdevsw[major(vp->v_rdev)].d_open == pfopen)) 1206 return (0); 1207 break; 1208 } 1209 } 1210 #endif 1211 1212 if ((p->p_p->ps_pledge & PLEDGE_TTY)) { 1213 switch (com) { 1214 #if NPTY > 0 1215 case PTMGET: 1216 if ((p->p_p->ps_pledge & PLEDGE_RPATH) == 0) 1217 break; 1218 if ((p->p_p->ps_pledge & PLEDGE_WPATH) == 0) 1219 break; 1220 if (fp->f_type != DTYPE_VNODE || vp->v_type != VCHR) 1221 break; 1222 if (cdevsw[major(vp->v_rdev)].d_open != ptmopen) 1223 break; 1224 return (0); 1225 case TIOCUCNTL: /* vmd */ 1226 if ((p->p_p->ps_pledge & PLEDGE_RPATH) == 0) 1227 break; 1228 if ((p->p_p->ps_pledge & PLEDGE_WPATH) == 0) 1229 break; 1230 if (cdevsw[major(vp->v_rdev)].d_open != ptcopen) 1231 break; 1232 return (0); 1233 #endif /* NPTY > 0 */ 1234 case TIOCSPGRP: 1235 if ((p->p_p->ps_pledge & PLEDGE_PROC) == 0) 1236 break; 1237 /* FALLTHROUGH */ 1238 case TIOCFLUSH: /* getty, telnet */ 1239 case TIOCSTART: /* emacs, etc */ 1240 case TIOCGPGRP: 1241 case TIOCGETA: 1242 case TIOCGWINSZ: /* ENOTTY return for non-tty */ 1243 case TIOCSTAT: /* csh */ 1244 if (fp->f_type == DTYPE_VNODE && (vp->v_flag & VISTTY)) 1245 return (0); 1246 return (ENOTTY); 1247 case TIOCSWINSZ: 1248 case TIOCEXT: /* mail, libedit .. */ 1249 case TIOCCBRK: /* cu */ 1250 case TIOCSBRK: /* cu */ 1251 case TIOCCDTR: /* cu */ 1252 case TIOCSDTR: /* cu */ 1253 case TIOCEXCL: /* cu */ 1254 case TIOCSETA: /* cu, ... */ 1255 case TIOCSETAW: /* cu, ... */ 1256 case TIOCSETAF: /* tcsetattr TCSAFLUSH, script */ 1257 case TIOCSCTTY: /* forkpty(3), login_tty(3), ... */ 1258 if (fp->f_type == DTYPE_VNODE && (vp->v_flag & VISTTY)) 1259 return (0); 1260 break; 1261 } 1262 } 1263 1264 if ((p->p_p->ps_pledge & PLEDGE_ROUTE)) { 1265 switch (com) { 1266 case SIOCGIFADDR: 1267 case SIOCGIFAFLAG_IN6: 1268 case SIOCGIFALIFETIME_IN6: 1269 case SIOCGIFDESCR: 1270 case SIOCGIFFLAGS: 1271 case SIOCGIFMETRIC: 1272 case SIOCGIFGMEMB: 1273 case SIOCGIFRDOMAIN: 1274 case SIOCGIFDSTADDR_IN6: 1275 case SIOCGIFNETMASK_IN6: 1276 case SIOCGIFXFLAGS: 1277 case SIOCGNBRINFO_IN6: 1278 case SIOCGIFINFO_IN6: 1279 case SIOCGIFMEDIA: 1280 if (fp->f_type == DTYPE_SOCKET) 1281 return (0); 1282 break; 1283 } 1284 } 1285 1286 if ((p->p_p->ps_pledge & PLEDGE_WROUTE)) { 1287 switch (com) { 1288 case SIOCAIFADDR_IN6: 1289 if (fp->f_type == DTYPE_SOCKET) 1290 return (0); 1291 break; 1292 case SIOCSIFMTU: 1293 if (fp->f_type == DTYPE_SOCKET) 1294 return (0); 1295 break; 1296 } 1297 } 1298 1299 #if NVMM > 0 1300 if ((p->p_p->ps_pledge & PLEDGE_VMM)) { 1301 if ((fp->f_type == DTYPE_VNODE) && 1302 (vp->v_type == VCHR) && 1303 (cdevsw[major(vp->v_rdev)].d_open == vmmopen)) { 1304 error = pledge_ioctl_vmm(p, com); 1305 if (error == 0) 1306 return 0; 1307 } 1308 } 1309 #endif 1310 1311 return pledge_fail(p, error, PLEDGE_TTY); 1312 } 1313 1314 int 1315 pledge_sockopt(struct proc *p, int set, int level, int optname) 1316 { 1317 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1318 return (0); 1319 1320 /* Always allow these, which are too common to reject */ 1321 switch (level) { 1322 case SOL_SOCKET: 1323 switch (optname) { 1324 case SO_RCVBUF: 1325 case SO_ERROR: 1326 return 0; 1327 } 1328 break; 1329 } 1330 1331 if ((p->p_p->ps_pledge & (PLEDGE_INET|PLEDGE_UNIX|PLEDGE_DNS|PLEDGE_YPACTIVE)) == 0) 1332 return pledge_fail(p, EPERM, PLEDGE_INET); 1333 /* In use by some service libraries */ 1334 switch (level) { 1335 case SOL_SOCKET: 1336 switch (optname) { 1337 case SO_TIMESTAMP: 1338 return 0; 1339 } 1340 break; 1341 } 1342 1343 /* DNS resolver may do these requests */ 1344 if ((p->p_p->ps_pledge & PLEDGE_DNS)) { 1345 switch (level) { 1346 case IPPROTO_IPV6: 1347 switch (optname) { 1348 case IPV6_RECVPKTINFO: 1349 case IPV6_USE_MIN_MTU: 1350 return (0); 1351 } 1352 } 1353 } 1354 1355 /* YP may do these requests */ 1356 if (p->p_p->ps_pledge & PLEDGE_YPACTIVE) { 1357 switch (level) { 1358 case IPPROTO_IP: 1359 switch (optname) { 1360 case IP_PORTRANGE: 1361 return (0); 1362 } 1363 break; 1364 1365 case IPPROTO_IPV6: 1366 switch (optname) { 1367 case IPV6_PORTRANGE: 1368 return (0); 1369 } 1370 break; 1371 } 1372 } 1373 1374 if ((p->p_p->ps_pledge & (PLEDGE_INET|PLEDGE_UNIX)) == 0) 1375 return pledge_fail(p, EPERM, PLEDGE_INET); 1376 switch (level) { 1377 case SOL_SOCKET: 1378 switch (optname) { 1379 case SO_RTABLE: 1380 return pledge_fail(p, EINVAL, PLEDGE_INET); 1381 } 1382 return (0); 1383 } 1384 1385 if ((p->p_p->ps_pledge & PLEDGE_INET) == 0) 1386 return pledge_fail(p, EPERM, PLEDGE_INET); 1387 switch (level) { 1388 case IPPROTO_TCP: 1389 switch (optname) { 1390 case TCP_NODELAY: 1391 case TCP_MD5SIG: 1392 case TCP_SACK_ENABLE: 1393 case TCP_MAXSEG: 1394 case TCP_NOPUSH: 1395 return (0); 1396 } 1397 break; 1398 case IPPROTO_IP: 1399 switch (optname) { 1400 case IP_OPTIONS: 1401 if (!set) 1402 return (0); 1403 break; 1404 case IP_TOS: 1405 case IP_TTL: 1406 case IP_MINTTL: 1407 case IP_IPDEFTTL: 1408 case IP_PORTRANGE: 1409 case IP_RECVDSTADDR: 1410 case IP_RECVDSTPORT: 1411 return (0); 1412 case IP_MULTICAST_IF: 1413 case IP_MULTICAST_TTL: 1414 case IP_MULTICAST_LOOP: 1415 case IP_ADD_MEMBERSHIP: 1416 case IP_DROP_MEMBERSHIP: 1417 if (p->p_p->ps_pledge & PLEDGE_MCAST) 1418 return (0); 1419 break; 1420 } 1421 break; 1422 case IPPROTO_ICMP: 1423 break; 1424 case IPPROTO_IPV6: 1425 switch (optname) { 1426 case IPV6_TCLASS: 1427 case IPV6_UNICAST_HOPS: 1428 case IPV6_MINHOPCOUNT: 1429 case IPV6_RECVHOPLIMIT: 1430 case IPV6_PORTRANGE: 1431 case IPV6_RECVPKTINFO: 1432 case IPV6_RECVDSTPORT: 1433 case IPV6_V6ONLY: 1434 return (0); 1435 case IPV6_MULTICAST_IF: 1436 case IPV6_MULTICAST_HOPS: 1437 case IPV6_MULTICAST_LOOP: 1438 case IPV6_JOIN_GROUP: 1439 case IPV6_LEAVE_GROUP: 1440 if (p->p_p->ps_pledge & PLEDGE_MCAST) 1441 return (0); 1442 break; 1443 } 1444 break; 1445 case IPPROTO_ICMPV6: 1446 break; 1447 } 1448 return pledge_fail(p, EPERM, PLEDGE_INET); 1449 } 1450 1451 int 1452 pledge_socket(struct proc *p, int domain, unsigned int state) 1453 { 1454 if (! ISSET(p->p_p->ps_flags, PS_PLEDGE)) 1455 return 0; 1456 1457 if (ISSET(state, SS_DNS)) { 1458 if (ISSET(p->p_p->ps_pledge, PLEDGE_DNS)) 1459 return 0; 1460 return pledge_fail(p, EPERM, PLEDGE_DNS); 1461 } 1462 1463 switch (domain) { 1464 case -1: /* accept on any domain */ 1465 return (0); 1466 case AF_INET: 1467 case AF_INET6: 1468 if (ISSET(p->p_p->ps_pledge, PLEDGE_INET) || 1469 ISSET(p->p_p->ps_pledge, PLEDGE_YPACTIVE)) 1470 return 0; 1471 return pledge_fail(p, EPERM, PLEDGE_INET); 1472 1473 case AF_UNIX: 1474 if (ISSET(p->p_p->ps_pledge, PLEDGE_UNIX)) 1475 return 0; 1476 return pledge_fail(p, EPERM, PLEDGE_UNIX); 1477 } 1478 1479 return pledge_fail(p, EINVAL, PLEDGE_INET); 1480 } 1481 1482 int 1483 pledge_flock(struct proc *p) 1484 { 1485 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1486 return (0); 1487 1488 if ((p->p_p->ps_pledge & PLEDGE_FLOCK)) 1489 return (0); 1490 return (pledge_fail(p, EPERM, PLEDGE_FLOCK)); 1491 } 1492 1493 int 1494 pledge_swapctl(struct proc *p) 1495 { 1496 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1497 return (0); 1498 return (EPERM); 1499 } 1500 1501 /* bsearch over pledgereq. return flags value if found, 0 else */ 1502 uint64_t 1503 pledgereq_flags(const char *req_name) 1504 { 1505 int base = 0, cmp, i, lim; 1506 1507 for (lim = nitems(pledgereq); lim != 0; lim >>= 1) { 1508 i = base + (lim >> 1); 1509 cmp = strcmp(req_name, pledgereq[i].name); 1510 if (cmp == 0) 1511 return (pledgereq[i].flags); 1512 if (cmp > 0) { /* not found before, move right */ 1513 base = i + 1; 1514 lim--; 1515 } /* else move left */ 1516 } 1517 return (0); 1518 } 1519 1520 int 1521 pledge_fcntl(struct proc *p, int cmd) 1522 { 1523 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1524 return (0); 1525 if ((p->p_p->ps_pledge & PLEDGE_PROC) == 0 && cmd == F_SETOWN) 1526 return pledge_fail(p, EPERM, PLEDGE_PROC); 1527 return (0); 1528 } 1529 1530 int 1531 pledge_kill(struct proc *p, pid_t pid) 1532 { 1533 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1534 return 0; 1535 if (p->p_p->ps_pledge & PLEDGE_PROC) 1536 return 0; 1537 if (pid == 0 || pid == p->p_p->ps_pid) 1538 return 0; 1539 return pledge_fail(p, EPERM, PLEDGE_PROC); 1540 } 1541 1542 int 1543 pledge_protexec(struct proc *p, int prot) 1544 { 1545 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1546 return 0; 1547 /* Before kbind(2) call, ld.so and crt may create EXEC mappings */ 1548 if (p->p_p->ps_kbind_addr == 0 && p->p_p->ps_kbind_cookie == 0) 1549 return 0; 1550 if (!(p->p_p->ps_pledge & PLEDGE_PROTEXEC) && (prot & PROT_EXEC)) 1551 return pledge_fail(p, EPERM, PLEDGE_PROTEXEC); 1552 return 0; 1553 } 1554 1555 int 1556 canonpath(const char *input, char *buf, size_t bufsize) 1557 { 1558 const char *p; 1559 char *q; 1560 1561 /* can't canon relative paths, don't bother */ 1562 if (input[0] != '/') { 1563 if (strlcpy(buf, input, bufsize) >= bufsize) 1564 return ENAMETOOLONG; 1565 return 0; 1566 } 1567 1568 p = input; 1569 q = buf; 1570 while (*p && (q - buf < bufsize)) { 1571 if (p[0] == '/' && (p[1] == '/' || p[1] == '\0')) { 1572 p += 1; 1573 1574 } else if (p[0] == '/' && p[1] == '.' && 1575 (p[2] == '/' || p[2] == '\0')) { 1576 p += 2; 1577 1578 } else if (p[0] == '/' && p[1] == '.' && p[2] == '.' && 1579 (p[3] == '/' || p[3] == '\0')) { 1580 p += 3; 1581 if (q != buf) /* "/../" at start of buf */ 1582 while (*--q != '/') 1583 continue; 1584 1585 } else { 1586 *q++ = *p++; 1587 } 1588 } 1589 if ((*p == '\0') && (q - buf < bufsize)) { 1590 *q = 0; 1591 return 0; 1592 } else 1593 return ENAMETOOLONG; 1594 } 1595