1 /* $OpenBSD: kern_pledge.c,v 1.290 2022/07/18 18:02:27 jca 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 #include <sys/mount.h> 22 #include <sys/proc.h> 23 #include <sys/mutex.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 #include <sys/swap.h> 38 39 #include <sys/ioctl.h> 40 #include <sys/termios.h> 41 #include <sys/tty.h> 42 #include <sys/device.h> 43 #include <sys/disklabel.h> 44 #include <sys/dkio.h> 45 #include <sys/mtio.h> 46 #include <sys/audioio.h> 47 #include <sys/videoio.h> 48 #include <net/bpf.h> 49 #include <net/route.h> 50 #include <net/if.h> 51 #include <net/if_var.h> 52 #include <netinet/in.h> 53 #include <netinet6/in6_var.h> 54 #include <netinet6/nd6.h> 55 #include <netinet/tcp.h> 56 #include <net/pfvar.h> 57 58 #include <sys/conf.h> 59 #include <sys/specdev.h> 60 #include <sys/signal.h> 61 #include <sys/signalvar.h> 62 #include <sys/syscall.h> 63 #include <sys/syscallargs.h> 64 #include <sys/systm.h> 65 66 #include <dev/biovar.h> 67 68 #define PLEDGENAMES 69 #include <sys/pledge.h> 70 71 #include "audio.h" 72 #include "bpfilter.h" 73 #include "pf.h" 74 #include "video.h" 75 #include "pty.h" 76 77 #if defined(__amd64__) 78 #include "vmm.h" 79 #if NVMM > 0 80 #include <machine/conf.h> 81 #endif 82 #endif 83 84 #include "drm.h" 85 86 uint64_t pledgereq_flags(const char *req); 87 int parsepledges(struct proc *p, const char *kname, 88 const char *promises, u_int64_t *fp); 89 int canonpath(const char *input, char *buf, size_t bufsize); 90 void unveil_destroy(struct process *ps); 91 92 /* #define DEBUG_PLEDGE */ 93 #ifdef DEBUG_PLEDGE 94 int debug_pledge = 1; 95 #define DPRINTF(x...) do { if (debug_pledge) printf(x); } while (0) 96 #define DNPRINTF(n,x...) do { if (debug_pledge >= (n)) printf(x); } while (0) 97 #else 98 #define DPRINTF(x...) 99 #define DNPRINTF(n,x...) 100 #endif 101 102 /* 103 * Ordered in blocks starting with least risky and most required. 104 */ 105 const uint64_t pledge_syscalls[SYS_MAXSYSCALL] = { 106 /* 107 * Minimum required 108 */ 109 [SYS_exit] = PLEDGE_ALWAYS, 110 [SYS_kbind] = PLEDGE_ALWAYS, 111 [SYS_msyscall] = PLEDGE_ALWAYS, 112 [SYS___get_tcb] = PLEDGE_ALWAYS, 113 [SYS___set_tcb] = PLEDGE_ALWAYS, 114 [SYS_pledge] = PLEDGE_ALWAYS, 115 [SYS_sendsyslog] = PLEDGE_ALWAYS, /* stack protector reporting */ 116 [SYS_thrkill] = PLEDGE_ALWAYS, /* raise, abort, stack pro */ 117 [SYS_utrace] = PLEDGE_ALWAYS, /* ltrace(1) from ld.so */ 118 119 /* "getting" information about self is considered safe */ 120 [SYS_getuid] = PLEDGE_STDIO, 121 [SYS_geteuid] = PLEDGE_STDIO, 122 [SYS_getresuid] = PLEDGE_STDIO, 123 [SYS_getgid] = PLEDGE_STDIO, 124 [SYS_getegid] = PLEDGE_STDIO, 125 [SYS_getresgid] = PLEDGE_STDIO, 126 [SYS_getgroups] = PLEDGE_STDIO, 127 [SYS_getlogin_r] = PLEDGE_STDIO, 128 [SYS_getpgrp] = PLEDGE_STDIO, 129 [SYS_getpgid] = PLEDGE_STDIO, 130 [SYS_getppid] = PLEDGE_STDIO, 131 [SYS_getsid] = PLEDGE_STDIO, 132 [SYS_getthrid] = PLEDGE_STDIO, 133 [SYS_getrlimit] = PLEDGE_STDIO, 134 [SYS_getrtable] = PLEDGE_STDIO, 135 [SYS_gettimeofday] = PLEDGE_STDIO, 136 [SYS_getdtablecount] = PLEDGE_STDIO, 137 [SYS_getrusage] = PLEDGE_STDIO, 138 [SYS_issetugid] = PLEDGE_STDIO, 139 [SYS_clock_getres] = PLEDGE_STDIO, 140 [SYS_clock_gettime] = PLEDGE_STDIO, 141 [SYS_getpid] = PLEDGE_STDIO, 142 143 /* 144 * Almost exclusively read-only, Very narrow subset. 145 * Use of "route", "inet", "dns", "ps", or "vminfo" 146 * expands access. 147 */ 148 [SYS_sysctl] = PLEDGE_STDIO, 149 150 /* Support for malloc(3) family of operations */ 151 [SYS_getentropy] = PLEDGE_STDIO, 152 [SYS_madvise] = PLEDGE_STDIO, 153 [SYS_minherit] = PLEDGE_STDIO, 154 [SYS_mmap] = PLEDGE_STDIO, 155 [SYS_mprotect] = PLEDGE_STDIO, 156 [SYS_mquery] = PLEDGE_STDIO, 157 [SYS_munmap] = PLEDGE_STDIO, 158 [SYS_msync] = PLEDGE_STDIO, 159 [SYS_break] = PLEDGE_STDIO, 160 161 [SYS_umask] = PLEDGE_STDIO, 162 163 /* read/write operations */ 164 [SYS_read] = PLEDGE_STDIO, 165 [SYS_readv] = PLEDGE_STDIO, 166 [SYS_pread] = PLEDGE_STDIO, 167 [SYS_preadv] = PLEDGE_STDIO, 168 [SYS_write] = PLEDGE_STDIO, 169 [SYS_writev] = PLEDGE_STDIO, 170 [SYS_pwrite] = PLEDGE_STDIO, 171 [SYS_pwritev] = PLEDGE_STDIO, 172 [SYS_recvmsg] = PLEDGE_STDIO, 173 [SYS_recvfrom] = PLEDGE_STDIO, 174 [SYS_ftruncate] = PLEDGE_STDIO, 175 [SYS_lseek] = PLEDGE_STDIO, 176 [SYS_fpathconf] = PLEDGE_STDIO, 177 178 /* 179 * Address selection required a network pledge ("inet", 180 * "unix", "dns". 181 */ 182 [SYS_sendto] = PLEDGE_STDIO, 183 184 /* 185 * Address specification required a network pledge ("inet", 186 * "unix", "dns". SCM_RIGHTS requires "sendfd" or "recvfd". 187 */ 188 [SYS_sendmsg] = PLEDGE_STDIO, 189 190 /* Common signal operations */ 191 [SYS_nanosleep] = PLEDGE_STDIO, 192 [SYS_sigaltstack] = PLEDGE_STDIO, 193 [SYS_sigprocmask] = PLEDGE_STDIO, 194 [SYS_sigsuspend] = PLEDGE_STDIO, 195 [SYS_sigaction] = PLEDGE_STDIO, 196 [SYS_sigreturn] = PLEDGE_STDIO, 197 [SYS_sigpending] = PLEDGE_STDIO, 198 [SYS_getitimer] = PLEDGE_STDIO, 199 [SYS_setitimer] = PLEDGE_STDIO, 200 201 /* 202 * To support event driven programming. 203 */ 204 [SYS_poll] = PLEDGE_STDIO, 205 [SYS_ppoll] = PLEDGE_STDIO, 206 [SYS_kevent] = PLEDGE_STDIO, 207 [SYS_kqueue] = PLEDGE_STDIO, 208 [SYS_select] = PLEDGE_STDIO, 209 [SYS_pselect] = PLEDGE_STDIO, 210 211 [SYS_fstat] = PLEDGE_STDIO, 212 [SYS_fsync] = PLEDGE_STDIO, 213 214 [SYS_setsockopt] = PLEDGE_STDIO, /* narrow whitelist */ 215 [SYS_getsockopt] = PLEDGE_STDIO, /* narrow whitelist */ 216 217 /* F_SETOWN requires PLEDGE_PROC */ 218 [SYS_fcntl] = PLEDGE_STDIO, 219 220 [SYS_close] = PLEDGE_STDIO, 221 [SYS_dup] = PLEDGE_STDIO, 222 [SYS_dup2] = PLEDGE_STDIO, 223 [SYS_dup3] = PLEDGE_STDIO, 224 [SYS_closefrom] = PLEDGE_STDIO, 225 [SYS_shutdown] = PLEDGE_STDIO, 226 [SYS_fchdir] = PLEDGE_STDIO, /* XXX consider tightening */ 227 228 [SYS_pipe] = PLEDGE_STDIO, 229 [SYS_pipe2] = PLEDGE_STDIO, 230 [SYS_socketpair] = PLEDGE_STDIO, 231 232 [SYS_wait4] = PLEDGE_STDIO, 233 234 /* 235 * Can kill self with "stdio". Killing another pid 236 * requires "proc" 237 */ 238 [SYS_kill] = PLEDGE_STDIO, 239 240 /* 241 * FIONREAD/FIONBIO for "stdio" 242 * Other ioctl are selectively allowed based upon other pledges. 243 */ 244 [SYS_ioctl] = PLEDGE_STDIO, 245 246 /* 247 * Path access/creation calls encounter many extensive 248 * checks done during pledge_namei() 249 */ 250 [SYS_open] = PLEDGE_STDIO, 251 [SYS_stat] = PLEDGE_STDIO, 252 [SYS_access] = PLEDGE_STDIO, 253 [SYS_readlink] = PLEDGE_STDIO, 254 [SYS___realpath] = PLEDGE_STDIO, 255 256 [SYS_adjtime] = PLEDGE_STDIO, /* setting requires "settime" */ 257 [SYS_adjfreq] = PLEDGE_SETTIME, 258 [SYS_settimeofday] = PLEDGE_SETTIME, 259 260 /* 261 * Needed by threaded programs 262 * XXX should we have a new "threads"? 263 */ 264 [SYS___tfork] = PLEDGE_STDIO, 265 [SYS_sched_yield] = PLEDGE_STDIO, 266 [SYS_futex] = PLEDGE_STDIO, 267 [SYS___thrsleep] = PLEDGE_STDIO, 268 [SYS___thrwakeup] = PLEDGE_STDIO, 269 [SYS___threxit] = PLEDGE_STDIO, 270 [SYS___thrsigdivert] = PLEDGE_STDIO, 271 272 [SYS_fork] = PLEDGE_PROC, 273 [SYS_vfork] = PLEDGE_PROC, 274 [SYS_setpgid] = PLEDGE_PROC, 275 [SYS_setsid] = PLEDGE_PROC, 276 277 [SYS_setrlimit] = PLEDGE_PROC | PLEDGE_ID, 278 [SYS_getpriority] = PLEDGE_PROC | PLEDGE_ID, 279 280 [SYS_setpriority] = PLEDGE_PROC | PLEDGE_ID, 281 282 [SYS_setuid] = PLEDGE_ID, 283 [SYS_seteuid] = PLEDGE_ID, 284 [SYS_setreuid] = PLEDGE_ID, 285 [SYS_setresuid] = PLEDGE_ID, 286 [SYS_setgid] = PLEDGE_ID, 287 [SYS_setegid] = PLEDGE_ID, 288 [SYS_setregid] = PLEDGE_ID, 289 [SYS_setresgid] = PLEDGE_ID, 290 [SYS_setgroups] = PLEDGE_ID, 291 [SYS_setlogin] = PLEDGE_ID, 292 [SYS_setrtable] = 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_mkfifoat] = PLEDGE_DPATH, 319 [SYS_mknod] = PLEDGE_DPATH, 320 [SYS_mknodat] = PLEDGE_DPATH, 321 322 [SYS_revoke] = PLEDGE_TTY, /* also requires PLEDGE_RPATH */ 323 324 /* 325 * Classify as RPATH|WPATH, because of path information leakage. 326 * WPATH due to unknown use of mk*temp(3) on non-/tmp paths.. 327 */ 328 [SYS___getcwd] = PLEDGE_RPATH | PLEDGE_WPATH, 329 330 /* Classify as RPATH, because these leak path information */ 331 [SYS_getdents] = PLEDGE_RPATH, 332 [SYS_getfsstat] = PLEDGE_RPATH, 333 [SYS_statfs] = PLEDGE_RPATH, 334 [SYS_fstatfs] = PLEDGE_RPATH, 335 [SYS_pathconf] = PLEDGE_RPATH, 336 337 [SYS_utimes] = PLEDGE_FATTR, 338 [SYS_futimes] = PLEDGE_FATTR, 339 [SYS_utimensat] = PLEDGE_FATTR, 340 [SYS_futimens] = PLEDGE_FATTR, 341 [SYS_chmod] = PLEDGE_FATTR, 342 [SYS_fchmod] = PLEDGE_FATTR, 343 [SYS_fchmodat] = PLEDGE_FATTR, 344 [SYS_chflags] = PLEDGE_FATTR, 345 [SYS_chflagsat] = PLEDGE_FATTR, 346 [SYS_fchflags] = PLEDGE_FATTR, 347 348 [SYS_chown] = PLEDGE_CHOWN, 349 [SYS_fchownat] = PLEDGE_CHOWN, 350 [SYS_lchown] = PLEDGE_CHOWN, 351 [SYS_fchown] = PLEDGE_CHOWN, 352 353 [SYS_socket] = PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS, 354 [SYS_connect] = PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS, 355 [SYS_bind] = PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS, 356 [SYS_getsockname] = PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS, 357 358 [SYS_listen] = PLEDGE_INET | PLEDGE_UNIX, 359 [SYS_accept4] = PLEDGE_INET | PLEDGE_UNIX, 360 [SYS_accept] = PLEDGE_INET | PLEDGE_UNIX, 361 [SYS_getpeername] = PLEDGE_INET | PLEDGE_UNIX, 362 363 [SYS_flock] = PLEDGE_FLOCK, 364 365 [SYS_ypconnect] = PLEDGE_GETPW, 366 367 [SYS_swapctl] = PLEDGE_VMINFO, 368 }; 369 370 static const struct { 371 char *name; 372 uint64_t flags; 373 } pledgereq[] = { 374 { "audio", PLEDGE_AUDIO }, 375 { "bpf", PLEDGE_BPF }, 376 { "chown", PLEDGE_CHOWN | PLEDGE_CHOWNUID }, 377 { "cpath", PLEDGE_CPATH }, 378 { "disklabel", PLEDGE_DISKLABEL }, 379 { "dns", PLEDGE_DNS }, 380 { "dpath", PLEDGE_DPATH }, 381 { "drm", PLEDGE_DRM }, 382 { "error", PLEDGE_ERROR }, 383 { "exec", PLEDGE_EXEC }, 384 { "fattr", PLEDGE_FATTR | PLEDGE_CHOWN }, 385 { "flock", PLEDGE_FLOCK }, 386 { "getpw", PLEDGE_GETPW }, 387 { "id", PLEDGE_ID }, 388 { "inet", PLEDGE_INET }, 389 { "mcast", PLEDGE_MCAST }, 390 { "pf", PLEDGE_PF }, 391 { "proc", PLEDGE_PROC }, 392 { "prot_exec", PLEDGE_PROTEXEC }, 393 { "ps", PLEDGE_PS }, 394 { "recvfd", PLEDGE_RECVFD }, 395 { "route", PLEDGE_ROUTE }, 396 { "rpath", PLEDGE_RPATH }, 397 { "sendfd", PLEDGE_SENDFD }, 398 { "settime", PLEDGE_SETTIME }, 399 { "stdio", PLEDGE_STDIO }, 400 { "tape", PLEDGE_TAPE }, 401 { "tmppath", PLEDGE_TMPPATH }, 402 { "tty", PLEDGE_TTY }, 403 { "unix", PLEDGE_UNIX }, 404 { "unveil", PLEDGE_UNVEIL }, 405 { "video", PLEDGE_VIDEO }, 406 { "vminfo", PLEDGE_VMINFO }, 407 { "vmm", PLEDGE_VMM }, 408 { "wpath", PLEDGE_WPATH }, 409 { "wroute", PLEDGE_WROUTE }, 410 }; 411 412 int 413 parsepledges(struct proc *p, const char *kname, const char *promises, u_int64_t *fp) 414 { 415 size_t rbuflen; 416 char *rbuf, *rp, *pn; 417 u_int64_t flags = 0, f; 418 int error; 419 420 rbuf = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 421 error = copyinstr(promises, rbuf, MAXPATHLEN, 422 &rbuflen); 423 if (error) { 424 free(rbuf, M_TEMP, MAXPATHLEN); 425 return (error); 426 } 427 #ifdef KTRACE 428 if (KTRPOINT(p, KTR_STRUCT)) 429 ktrstruct(p, kname, rbuf, rbuflen-1); 430 #endif 431 432 for (rp = rbuf; rp && *rp; rp = pn) { 433 pn = strchr(rp, ' '); /* find terminator */ 434 if (pn) { 435 while (*pn == ' ') 436 *pn++ = '\0'; 437 } 438 if ((f = pledgereq_flags(rp)) == 0) { 439 free(rbuf, M_TEMP, MAXPATHLEN); 440 return (EINVAL); 441 } 442 flags |= f; 443 } 444 free(rbuf, M_TEMP, MAXPATHLEN); 445 *fp = flags; 446 return 0; 447 } 448 449 int 450 sys_pledge(struct proc *p, void *v, register_t *retval) 451 { 452 struct sys_pledge_args /* { 453 syscallarg(const char *)promises; 454 syscallarg(const char *)execpromises; 455 } */ *uap = v; 456 struct process *pr = p->p_p; 457 uint64_t promises, execpromises; 458 int error; 459 int unveil_cleanup = 0; 460 461 /* Check for any error in user input */ 462 if (SCARG(uap, promises)) { 463 error = parsepledges(p, "pledgereq", 464 SCARG(uap, promises), &promises); 465 if (error) 466 return (error); 467 } 468 if (SCARG(uap, execpromises)) { 469 error = parsepledges(p, "pledgeexecreq", 470 SCARG(uap, execpromises), &execpromises); 471 if (error) 472 return (error); 473 } 474 475 mtx_enter(&pr->ps_mtx); 476 477 /* Check for any error wrt current promises */ 478 if (SCARG(uap, promises)) { 479 /* In "error" mode, ignore promise increase requests, 480 * but accept promise decrease requests */ 481 if (ISSET(pr->ps_flags, PS_PLEDGE) && 482 (pr->ps_pledge & PLEDGE_ERROR)) 483 promises &= (pr->ps_pledge & PLEDGE_USERSET); 484 485 /* Only permit reductions */ 486 if (ISSET(pr->ps_flags, PS_PLEDGE) && 487 (((promises | pr->ps_pledge) != pr->ps_pledge))) { 488 mtx_leave(&pr->ps_mtx); 489 return (EPERM); 490 } 491 } 492 if (SCARG(uap, execpromises)) { 493 /* Only permit reductions */ 494 if (ISSET(pr->ps_flags, PS_EXECPLEDGE) && 495 (((execpromises | pr->ps_execpledge) != pr->ps_execpledge))) { 496 mtx_leave(&pr->ps_mtx); 497 return (EPERM); 498 } 499 } 500 501 /* Set up promises */ 502 if (SCARG(uap, promises)) { 503 pr->ps_pledge = promises; 504 atomic_setbits_int(&pr->ps_flags, PS_PLEDGE); 505 506 if ((pr->ps_pledge & (PLEDGE_RPATH | PLEDGE_WPATH | 507 PLEDGE_CPATH | PLEDGE_DPATH | PLEDGE_TMPPATH | PLEDGE_EXEC | 508 PLEDGE_UNIX | PLEDGE_UNVEIL)) == 0) 509 unveil_cleanup = 1; 510 } 511 if (SCARG(uap, execpromises)) { 512 pr->ps_execpledge = execpromises; 513 atomic_setbits_int(&pr->ps_flags, PS_EXECPLEDGE); 514 } 515 516 mtx_leave(&pr->ps_mtx); 517 518 if (unveil_cleanup) { 519 /* 520 * Kill off unveil and drop unveil vnode refs if we no 521 * longer are holding any path-accessing pledge 522 */ 523 KERNEL_LOCK(); 524 unveil_destroy(pr); 525 KERNEL_UNLOCK(); 526 } 527 528 return (0); 529 } 530 531 int 532 pledge_syscall(struct proc *p, int code, uint64_t *tval) 533 { 534 p->p_pledge_syscall = code; 535 *tval = 0; 536 537 if (code < 0 || code > SYS_MAXSYSCALL - 1) 538 return (EINVAL); 539 540 if (pledge_syscalls[code] == PLEDGE_ALWAYS) 541 return (0); 542 543 if (p->p_p->ps_pledge & pledge_syscalls[code]) 544 return (0); 545 546 *tval = pledge_syscalls[code]; 547 return (EPERM); 548 } 549 550 int 551 pledge_fail(struct proc *p, int error, uint64_t code) 552 { 553 const char *codes = ""; 554 int i; 555 556 /* Print first matching pledge */ 557 for (i = 0; code && pledgenames[i].bits != 0; i++) 558 if (pledgenames[i].bits & code) { 559 codes = pledgenames[i].name; 560 break; 561 } 562 #ifdef KTRACE 563 if (KTRPOINT(p, KTR_PLEDGE)) 564 ktrpledge(p, error, code, p->p_pledge_syscall); 565 #endif 566 if (p->p_p->ps_pledge & PLEDGE_ERROR) 567 return (ENOSYS); 568 569 KERNEL_LOCK(); 570 log(LOG_ERR, "%s[%d]: pledge \"%s\", syscall %d\n", 571 p->p_p->ps_comm, p->p_p->ps_pid, codes, p->p_pledge_syscall); 572 p->p_p->ps_acflag |= APLEDGE; 573 574 /* Stop threads immediately, because this process is suspect */ 575 if (P_HASSIBLING(p)) 576 single_thread_set(p, SINGLE_SUSPEND, 1); 577 578 /* Send uncatchable SIGABRT for coredump */ 579 sigabort(p); 580 581 p->p_p->ps_pledge = 0; /* Disable all PLEDGE_ flags */ 582 KERNEL_UNLOCK(); 583 return (error); 584 } 585 586 /* 587 * Need to make it more obvious that one cannot get through here 588 * without the right flags set 589 */ 590 int 591 pledge_namei(struct proc *p, struct nameidata *ni, char *origpath) 592 { 593 char path[PATH_MAX]; 594 uint64_t pledge; 595 int error; 596 597 if ((p->p_p->ps_flags & PS_PLEDGE) == 0 || 598 (p->p_p->ps_flags & PS_COREDUMP)) 599 return (0); 600 pledge = READ_ONCE(p->p_p->ps_pledge); 601 602 if (ni->ni_pledge == 0) 603 panic("pledge_namei: ni_pledge"); 604 605 /* 606 * We set the BYPASSUNVEIL flag to skip unveil checks 607 * as necessary 608 */ 609 610 /* Doing a permitted execve() */ 611 if ((ni->ni_pledge & PLEDGE_EXEC) && 612 (pledge & PLEDGE_EXEC)) 613 return (0); 614 615 error = canonpath(origpath, path, sizeof(path)); 616 if (error) 617 return (error); 618 619 /* Detect what looks like a mkstemp(3) family operation */ 620 if ((pledge & PLEDGE_TMPPATH) && 621 (p->p_pledge_syscall == SYS_open) && 622 (ni->ni_pledge & PLEDGE_CPATH) && 623 strncmp(path, "/tmp/", sizeof("/tmp/") - 1) == 0) { 624 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 625 return (0); 626 } 627 628 /* Allow unlinking of a mkstemp(3) file... 629 * Good opportunity for strict checks here. 630 */ 631 if ((pledge & PLEDGE_TMPPATH) && 632 (p->p_pledge_syscall == SYS_unlink) && 633 strncmp(path, "/tmp/", sizeof("/tmp/") - 1) == 0) { 634 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 635 return (0); 636 } 637 638 /* Whitelisted paths */ 639 switch (p->p_pledge_syscall) { 640 case SYS_access: 641 /* tzset() needs this. */ 642 if (ni->ni_pledge == PLEDGE_RPATH && 643 strcmp(path, "/etc/localtime") == 0) { 644 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 645 return (0); 646 } 647 /* 648 * XXX delete before 7.2. 649 * Old static binaries may try this file in getpwent and friends 650 */ 651 if ((ni->ni_pledge == PLEDGE_RPATH) && 652 (pledge & PLEDGE_GETPW) && 653 strcmp(path, "/var/run/ypbind.lock") == 0) { 654 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 655 return (0); 656 } 657 break; 658 case SYS_open: 659 /* daemon(3) or other such functions */ 660 if ((ni->ni_pledge & ~(PLEDGE_RPATH | PLEDGE_WPATH)) == 0 && 661 strcmp(path, "/dev/null") == 0) { 662 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 663 return (0); 664 } 665 666 /* readpassphrase(3), getpass(3) */ 667 if ((pledge & PLEDGE_TTY) && 668 (ni->ni_pledge & ~(PLEDGE_RPATH | PLEDGE_WPATH)) == 0 && 669 strcmp(path, "/dev/tty") == 0) { 670 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 671 return (0); 672 } 673 674 /* getpw* and friends need a few files */ 675 if ((ni->ni_pledge == PLEDGE_RPATH) && 676 (pledge & PLEDGE_GETPW)) { 677 if (strcmp(path, "/etc/spwd.db") == 0) 678 return (EPERM); /* don't call pledge_fail */ 679 if (strcmp(path, "/etc/pwd.db") == 0) { 680 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 681 return (0); 682 } 683 if (strcmp(path, "/etc/group") == 0) { 684 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 685 return (0); 686 } 687 if (strcmp(path, "/etc/netid") == 0) { 688 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 689 return (0); 690 } 691 } 692 693 /* DNS needs /etc/{resolv.conf,hosts,services,protocols}. */ 694 if ((ni->ni_pledge == PLEDGE_RPATH) && 695 (pledge & PLEDGE_DNS)) { 696 if (strcmp(path, "/etc/resolv.conf") == 0) { 697 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 698 return (0); 699 } 700 if (strcmp(path, "/etc/hosts") == 0) { 701 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 702 return (0); 703 } 704 if (strcmp(path, "/etc/services") == 0) { 705 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 706 return (0); 707 } 708 if (strcmp(path, "/etc/protocols") == 0) { 709 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 710 return (0); 711 } 712 } 713 714 /* 715 * XXX delete before 7.2. 716 * Old static binaries may try this file in getpwent and friends 717 */ 718 if ((ni->ni_pledge == PLEDGE_RPATH) && 719 (pledge & PLEDGE_GETPW) && 720 strcmp(path, "/var/run/ypbind.lock") == 0) { 721 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 722 return (0); 723 } 724 725 /* tzset() needs these. */ 726 if ((ni->ni_pledge == PLEDGE_RPATH) && 727 strncmp(path, "/usr/share/zoneinfo/", 728 sizeof("/usr/share/zoneinfo/") - 1) == 0) { 729 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 730 return (0); 731 } 732 if ((ni->ni_pledge == PLEDGE_RPATH) && 733 strcmp(path, "/etc/localtime") == 0) { 734 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 735 return (0); 736 } 737 738 break; 739 case SYS_stat: 740 /* DNS needs /etc/{resolv.conf,hosts}. */ 741 if ((ni->ni_pledge == PLEDGE_RPATH) && 742 (pledge & PLEDGE_DNS)) { 743 if (strcmp(path, "/etc/resolv.conf") == 0) { 744 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 745 return (0); 746 } 747 if (strcmp(path, "/etc/hosts") == 0) { 748 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 749 return (0); 750 } 751 } 752 break; 753 } 754 755 /* 756 * Ensure each flag of ni_pledge has counterpart allowing it in 757 * ps_pledge. 758 */ 759 if (ni->ni_pledge & ~pledge) 760 return (pledge_fail(p, EPERM, (ni->ni_pledge & ~pledge))); 761 762 /* continue, and check unveil if present */ 763 return (0); 764 } 765 766 /* 767 * Only allow reception of safe file descriptors. 768 */ 769 int 770 pledge_recvfd(struct proc *p, struct file *fp) 771 { 772 struct vnode *vp; 773 774 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 775 return (0); 776 if ((p->p_p->ps_pledge & PLEDGE_RECVFD) == 0) 777 return pledge_fail(p, EPERM, PLEDGE_RECVFD); 778 779 switch (fp->f_type) { 780 case DTYPE_SOCKET: 781 case DTYPE_PIPE: 782 case DTYPE_DMABUF: 783 case DTYPE_SYNC: 784 return (0); 785 case DTYPE_VNODE: 786 vp = fp->f_data; 787 788 if (vp->v_type != VDIR) 789 return (0); 790 } 791 return pledge_fail(p, EINVAL, PLEDGE_RECVFD); 792 } 793 794 /* 795 * Only allow sending of safe file descriptors. 796 */ 797 int 798 pledge_sendfd(struct proc *p, struct file *fp) 799 { 800 struct vnode *vp; 801 802 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 803 return (0); 804 if ((p->p_p->ps_pledge & PLEDGE_SENDFD) == 0) 805 return pledge_fail(p, EPERM, PLEDGE_SENDFD); 806 807 switch (fp->f_type) { 808 case DTYPE_SOCKET: 809 case DTYPE_PIPE: 810 case DTYPE_DMABUF: 811 case DTYPE_SYNC: 812 return (0); 813 case DTYPE_VNODE: 814 vp = fp->f_data; 815 816 if (vp->v_type != VDIR) 817 return (0); 818 break; 819 } 820 return pledge_fail(p, EINVAL, PLEDGE_SENDFD); 821 } 822 823 int 824 pledge_sysctl(struct proc *p, int miblen, int *mib, void *new) 825 { 826 char buf[80]; 827 uint64_t pledge; 828 int i; 829 830 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 831 return (0); 832 pledge = READ_ONCE(p->p_p->ps_pledge); 833 834 if (new) 835 return pledge_fail(p, EFAULT, 0); 836 837 /* routing table observation */ 838 if ((pledge & PLEDGE_ROUTE)) { 839 if ((miblen == 6 || miblen == 7) && 840 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 841 mib[2] == 0 && 842 mib[4] == NET_RT_DUMP) 843 return (0); 844 845 if (miblen == 6 && 846 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 847 mib[2] == 0 && 848 (mib[3] == 0 || mib[3] == AF_INET6 || mib[3] == AF_INET) && 849 (mib[4] == NET_RT_TABLE || mib[4] == NET_RT_SOURCE)) 850 return (0); 851 852 if (miblen == 7 && /* exposes MACs */ 853 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 854 mib[2] == 0 && 855 (mib[3] == 0 || mib[3] == AF_INET6 || mib[3] == AF_INET) && 856 mib[4] == NET_RT_FLAGS && mib[5] == RTF_LLINFO) 857 return (0); 858 } 859 860 if ((pledge & PLEDGE_WROUTE)) { 861 if (miblen == 4 && 862 mib[0] == CTL_NET && mib[1] == PF_INET6 && 863 mib[2] == IPPROTO_IPV6 && mib[3] == IPV6CTL_SOIIKEY) 864 return (0); 865 } 866 867 if (pledge & (PLEDGE_PS | PLEDGE_VMINFO)) { 868 if (miblen == 2 && /* kern.fscale */ 869 mib[0] == CTL_KERN && mib[1] == KERN_FSCALE) 870 return (0); 871 if (miblen == 2 && /* kern.boottime */ 872 mib[0] == CTL_KERN && mib[1] == KERN_BOOTTIME) 873 return (0); 874 if (miblen == 2 && /* kern.consdev */ 875 mib[0] == CTL_KERN && mib[1] == KERN_CONSDEV) 876 return (0); 877 if (miblen == 2 && /* kern.cptime */ 878 mib[0] == CTL_KERN && mib[1] == KERN_CPTIME) 879 return (0); 880 if (miblen == 3 && /* kern.cptime2 */ 881 mib[0] == CTL_KERN && mib[1] == KERN_CPTIME2) 882 return (0); 883 if (miblen == 3 && /* kern.cpustats */ 884 mib[0] == CTL_KERN && mib[1] == KERN_CPUSTATS) 885 return (0); 886 } 887 888 if ((pledge & PLEDGE_PS)) { 889 if (miblen == 4 && /* kern.procargs.* */ 890 mib[0] == CTL_KERN && mib[1] == KERN_PROC_ARGS && 891 (mib[3] == KERN_PROC_ARGV || mib[3] == KERN_PROC_ENV)) 892 return (0); 893 if (miblen == 6 && /* kern.proc.* */ 894 mib[0] == CTL_KERN && mib[1] == KERN_PROC) 895 return (0); 896 if (miblen == 3 && /* kern.proc_cwd.* */ 897 mib[0] == CTL_KERN && mib[1] == KERN_PROC_CWD) 898 return (0); 899 if (miblen == 2 && /* kern.ccpu */ 900 mib[0] == CTL_KERN && mib[1] == KERN_CCPU) 901 return (0); 902 if (miblen == 2 && /* vm.maxslp */ 903 mib[0] == CTL_VM && mib[1] == VM_MAXSLP) 904 return (0); 905 } 906 907 if ((pledge & PLEDGE_VMINFO)) { 908 if (miblen == 2 && /* vm.uvmexp */ 909 mib[0] == CTL_VM && mib[1] == VM_UVMEXP) 910 return (0); 911 if (miblen == 3 && /* vfs.generic.bcachestat */ 912 mib[0] == CTL_VFS && mib[1] == VFS_GENERIC && 913 mib[2] == VFS_BCACHESTAT) 914 return (0); 915 if (miblen == 3 && /* for sysconf(3) */ 916 mib[0] == CTL_NET && mib[1] == PF_INET6) 917 return (0); 918 } 919 920 if ((pledge & (PLEDGE_INET | PLEDGE_UNIX))) { 921 if (miblen == 2 && /* kern.somaxconn */ 922 mib[0] == CTL_KERN && mib[1] == KERN_SOMAXCONN) 923 return (0); 924 } 925 926 if ((pledge & (PLEDGE_ROUTE | PLEDGE_INET | PLEDGE_DNS))) { 927 if (miblen == 6 && /* getifaddrs() */ 928 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 929 mib[2] == 0 && 930 (mib[3] == 0 || mib[3] == AF_INET6 || mib[3] == AF_INET) && 931 mib[4] == NET_RT_IFLIST) 932 return (0); 933 } 934 935 if ((pledge & PLEDGE_DISKLABEL)) { 936 if (miblen == 2 && /* kern.rawpartition */ 937 mib[0] == CTL_KERN && 938 mib[1] == KERN_RAWPARTITION) 939 return (0); 940 if (miblen == 2 && /* kern.maxpartitions */ 941 mib[0] == CTL_KERN && 942 mib[1] == KERN_MAXPARTITIONS) 943 return (0); 944 #ifdef CPU_CHR2BLK 945 if (miblen == 3 && /* machdep.chr2blk */ 946 mib[0] == CTL_MACHDEP && 947 mib[1] == CPU_CHR2BLK) 948 return (0); 949 #endif /* CPU_CHR2BLK */ 950 } 951 952 if (miblen >= 3 && /* ntpd(8) to read sensors */ 953 mib[0] == CTL_HW && mib[1] == HW_SENSORS) 954 return (0); 955 956 if (miblen == 6 && /* if_nameindex() */ 957 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 958 mib[2] == 0 && mib[3] == 0 && mib[4] == NET_RT_IFNAMES) 959 return (0); 960 961 if (miblen == 2) { 962 switch (mib[0]) { 963 case CTL_KERN: 964 switch (mib[1]) { 965 case KERN_DOMAINNAME: /* getdomainname() */ 966 case KERN_HOSTNAME: /* gethostname() */ 967 case KERN_OSTYPE: /* uname() */ 968 case KERN_OSRELEASE: /* uname() */ 969 case KERN_OSVERSION: /* uname() */ 970 case KERN_VERSION: /* uname() */ 971 case KERN_CLOCKRATE: /* kern.clockrate */ 972 case KERN_ARGMAX: /* kern.argmax */ 973 case KERN_NGROUPS: /* kern.ngroups */ 974 case KERN_SYSVSHM: /* kern.sysvshm */ 975 case KERN_POSIX1: /* kern.posix1version */ 976 return (0); 977 } 978 break; 979 case CTL_HW: 980 switch (mib[1]) { 981 case HW_MACHINE: /* uname() */ 982 case HW_PAGESIZE: /* getpagesize() */ 983 case HW_PHYSMEM64: /* hw.physmem */ 984 case HW_NCPU: /* hw.ncpu */ 985 case HW_NCPUONLINE: /* hw.ncpuonline */ 986 case HW_USERMEM64: /* hw.usermem */ 987 return (0); 988 } 989 break; 990 case CTL_VM: 991 switch (mib[1]) { 992 case VM_PSSTRINGS: /* setproctitle() */ 993 case VM_LOADAVG: /* vm.loadavg / getloadavg(3) */ 994 case VM_MALLOC_CONF: /* vm.malloc_conf */ 995 return (0); 996 } 997 break; 998 default: 999 break; 1000 } 1001 } 1002 1003 #ifdef CPU_SSE 1004 if (miblen == 2 && /* i386 libm tests for SSE */ 1005 mib[0] == CTL_MACHDEP && mib[1] == CPU_SSE) 1006 return (0); 1007 #endif /* CPU_SSE */ 1008 1009 #ifdef CPU_ID_AA64ISAR0 1010 if (miblen == 2 && /* arm64 libcrypto inspects CPU features */ 1011 mib[0] == CTL_MACHDEP && mib[1] == CPU_ID_AA64ISAR0) 1012 return (0); 1013 #endif /* CPU_ID_AA64ISAR0 */ 1014 1015 snprintf(buf, sizeof(buf), "%s(%d): pledge sysctl %d:", 1016 p->p_p->ps_comm, p->p_p->ps_pid, miblen); 1017 for (i = 0; i < miblen; i++) { 1018 char *p = buf + strlen(buf); 1019 snprintf(p, sizeof(buf) - (p - buf), " %d", mib[i]); 1020 } 1021 log(LOG_ERR, "%s\n", buf); 1022 1023 return pledge_fail(p, EINVAL, 0); 1024 } 1025 1026 int 1027 pledge_chown(struct proc *p, uid_t uid, gid_t gid) 1028 { 1029 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1030 return (0); 1031 1032 if (p->p_p->ps_pledge & PLEDGE_CHOWNUID) 1033 return (0); 1034 1035 if (uid != -1 && uid != p->p_ucred->cr_uid) 1036 return (EPERM); 1037 if (gid != -1 && !groupmember(gid, p->p_ucred)) 1038 return (EPERM); 1039 return (0); 1040 } 1041 1042 int 1043 pledge_adjtime(struct proc *p, const void *v) 1044 { 1045 const struct timeval *delta = v; 1046 1047 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1048 return (0); 1049 1050 if ((p->p_p->ps_pledge & PLEDGE_SETTIME)) 1051 return (0); 1052 if (delta) 1053 return (EPERM); 1054 return (0); 1055 } 1056 1057 int 1058 pledge_sendit(struct proc *p, const void *to) 1059 { 1060 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1061 return (0); 1062 1063 if ((p->p_p->ps_pledge & (PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS))) 1064 return (0); /* may use address */ 1065 if (to == NULL) 1066 return (0); /* behaves just like write */ 1067 return pledge_fail(p, EPERM, PLEDGE_INET); 1068 } 1069 1070 int 1071 pledge_ioctl(struct proc *p, long com, struct file *fp) 1072 { 1073 struct vnode *vp = NULL; 1074 int error = EPERM; 1075 uint64_t pledge; 1076 1077 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1078 return (0); 1079 pledge = READ_ONCE(p->p_p->ps_pledge); 1080 1081 /* 1082 * The ioctl's which are always allowed. 1083 */ 1084 switch (com) { 1085 case FIONREAD: 1086 case FIONBIO: 1087 case FIOCLEX: 1088 case FIONCLEX: 1089 return (0); 1090 } 1091 1092 /* fp != NULL was already checked */ 1093 if (fp->f_type == DTYPE_VNODE) { 1094 vp = fp->f_data; 1095 if (vp->v_type == VBAD) 1096 return (ENOTTY); 1097 } 1098 1099 if ((pledge & PLEDGE_INET)) { 1100 switch (com) { 1101 case SIOCATMARK: 1102 case SIOCGIFGROUP: 1103 if (fp->f_type == DTYPE_SOCKET) 1104 return (0); 1105 break; 1106 } 1107 } 1108 1109 #if NBPFILTER > 0 1110 if ((pledge & PLEDGE_BPF)) { 1111 switch (com) { 1112 case BIOCGSTATS: /* bpf: tcpdump privsep on ^C */ 1113 if (fp->f_type == DTYPE_VNODE && 1114 fp->f_ops->fo_ioctl == vn_ioctl && 1115 vp->v_type == VCHR && 1116 cdevsw[major(vp->v_rdev)].d_open == bpfopen) 1117 return (0); 1118 break; 1119 } 1120 } 1121 #endif /* NBPFILTER > 0 */ 1122 1123 if ((pledge & PLEDGE_TAPE)) { 1124 switch (com) { 1125 case MTIOCGET: 1126 case MTIOCTOP: 1127 /* for pax(1) and such, checking tapes... */ 1128 if (fp->f_type == DTYPE_VNODE && 1129 vp->v_type == VCHR) { 1130 if (vp->v_flag & VISTTY) 1131 return (ENOTTY); 1132 else 1133 return (0); 1134 } 1135 break; 1136 } 1137 } 1138 1139 #if NDRM > 0 1140 if ((pledge & PLEDGE_DRM)) { 1141 if ((fp->f_type == DTYPE_VNODE) && 1142 (vp->v_type == VCHR) && 1143 (cdevsw[major(vp->v_rdev)].d_open == drmopen)) { 1144 error = pledge_ioctl_drm(p, com, vp->v_rdev); 1145 if (error == 0) 1146 return 0; 1147 } 1148 } 1149 #endif /* NDRM > 0 */ 1150 1151 #if NAUDIO > 0 1152 if ((pledge & PLEDGE_AUDIO)) { 1153 switch (com) { 1154 case AUDIO_GETPOS: 1155 case AUDIO_GETPAR: 1156 case AUDIO_SETPAR: 1157 case AUDIO_START: 1158 case AUDIO_STOP: 1159 case AUDIO_MIXER_DEVINFO: 1160 case AUDIO_MIXER_READ: 1161 case AUDIO_MIXER_WRITE: 1162 if (fp->f_type == DTYPE_VNODE && 1163 vp->v_type == VCHR && 1164 cdevsw[major(vp->v_rdev)].d_open == audioopen) 1165 return (0); 1166 } 1167 } 1168 #endif /* NAUDIO > 0 */ 1169 1170 if ((pledge & PLEDGE_DISKLABEL)) { 1171 switch (com) { 1172 case DIOCGDINFO: 1173 case DIOCGPDINFO: 1174 case DIOCRLDINFO: 1175 case DIOCWDINFO: 1176 case BIOCDISK: 1177 case BIOCINQ: 1178 case BIOCINSTALLBOOT: 1179 case BIOCVOL: 1180 if (fp->f_type == DTYPE_VNODE && 1181 ((vp->v_type == VCHR && 1182 cdevsw[major(vp->v_rdev)].d_type == D_DISK) || 1183 (vp->v_type == VBLK && 1184 bdevsw[major(vp->v_rdev)].d_type == D_DISK))) 1185 return (0); 1186 break; 1187 case DIOCMAP: 1188 if (fp->f_type == DTYPE_VNODE && 1189 vp->v_type == VCHR && 1190 cdevsw[major(vp->v_rdev)].d_ioctl == diskmapioctl) 1191 return (0); 1192 break; 1193 } 1194 } 1195 1196 #if NVIDEO > 0 1197 if ((pledge & PLEDGE_VIDEO)) { 1198 switch (com) { 1199 case VIDIOC_QUERYCAP: 1200 case VIDIOC_TRY_FMT: 1201 case VIDIOC_ENUM_FMT: 1202 case VIDIOC_S_FMT: 1203 case VIDIOC_QUERYCTRL: 1204 case VIDIOC_G_CTRL: 1205 case VIDIOC_S_CTRL: 1206 case VIDIOC_G_PARM: 1207 case VIDIOC_S_PARM: 1208 case VIDIOC_REQBUFS: 1209 case VIDIOC_QBUF: 1210 case VIDIOC_DQBUF: 1211 case VIDIOC_QUERYBUF: 1212 case VIDIOC_STREAMON: 1213 case VIDIOC_STREAMOFF: 1214 case VIDIOC_ENUM_FRAMESIZES: 1215 case VIDIOC_ENUM_FRAMEINTERVALS: 1216 case VIDIOC_DQEVENT: 1217 case VIDIOC_ENCODER_CMD: 1218 case VIDIOC_EXPBUF: 1219 case VIDIOC_G_CROP: 1220 case VIDIOC_G_EXT_CTRLS: 1221 case VIDIOC_G_FMT: 1222 case VIDIOC_G_SELECTION: 1223 case VIDIOC_QUERYMENU: 1224 case VIDIOC_SUBSCRIBE_EVENT: 1225 case VIDIOC_S_EXT_CTRLS: 1226 case VIDIOC_S_SELECTION: 1227 case VIDIOC_TRY_DECODER_CMD: 1228 case VIDIOC_TRY_ENCODER_CMD: 1229 if (fp->f_type == DTYPE_VNODE && 1230 vp->v_type == VCHR && 1231 cdevsw[major(vp->v_rdev)].d_open == videoopen) 1232 return (0); 1233 break; 1234 } 1235 } 1236 #endif 1237 1238 #if NPF > 0 1239 if ((pledge & PLEDGE_PF)) { 1240 switch (com) { 1241 case DIOCADDRULE: 1242 case DIOCGETSTATUS: 1243 case DIOCNATLOOK: 1244 case DIOCRADDTABLES: 1245 case DIOCRCLRADDRS: 1246 case DIOCRCLRTABLES: 1247 case DIOCRCLRTSTATS: 1248 case DIOCRGETTSTATS: 1249 case DIOCRSETADDRS: 1250 case DIOCXBEGIN: 1251 case DIOCXCOMMIT: 1252 case DIOCKILLSRCNODES: 1253 if ((fp->f_type == DTYPE_VNODE) && 1254 (vp->v_type == VCHR) && 1255 (cdevsw[major(vp->v_rdev)].d_open == pfopen)) 1256 return (0); 1257 break; 1258 } 1259 } 1260 #endif 1261 1262 if ((pledge & PLEDGE_TTY)) { 1263 switch (com) { 1264 #if NPTY > 0 1265 case PTMGET: 1266 if ((pledge & PLEDGE_RPATH) == 0) 1267 break; 1268 if ((pledge & PLEDGE_WPATH) == 0) 1269 break; 1270 if (fp->f_type != DTYPE_VNODE || vp->v_type != VCHR) 1271 break; 1272 if (cdevsw[major(vp->v_rdev)].d_open != ptmopen) 1273 break; 1274 return (0); 1275 case TIOCUCNTL: /* vmd */ 1276 if ((pledge & PLEDGE_RPATH) == 0) 1277 break; 1278 if ((pledge & PLEDGE_WPATH) == 0) 1279 break; 1280 if (cdevsw[major(vp->v_rdev)].d_open != ptcopen) 1281 break; 1282 return (0); 1283 #endif /* NPTY > 0 */ 1284 case TIOCSPGRP: 1285 if ((pledge & PLEDGE_PROC) == 0) 1286 break; 1287 /* FALLTHROUGH */ 1288 case TIOCFLUSH: /* getty, telnet */ 1289 case TIOCSTART: /* emacs, etc */ 1290 case TIOCGPGRP: 1291 case TIOCGETA: 1292 case TIOCGWINSZ: /* ENOTTY return for non-tty */ 1293 case TIOCSTAT: /* csh */ 1294 if (fp->f_type == DTYPE_VNODE && (vp->v_flag & VISTTY)) 1295 return (0); 1296 return (ENOTTY); 1297 case TIOCSWINSZ: 1298 case TIOCEXT: /* mail, libedit .. */ 1299 case TIOCCBRK: /* cu */ 1300 case TIOCSBRK: /* cu */ 1301 case TIOCCDTR: /* cu */ 1302 case TIOCSDTR: /* cu */ 1303 case TIOCEXCL: /* cu */ 1304 case TIOCSETA: /* cu, ... */ 1305 case TIOCSETAW: /* cu, ... */ 1306 case TIOCSETAF: /* tcsetattr TCSAFLUSH, script */ 1307 case TIOCSCTTY: /* forkpty(3), login_tty(3), ... */ 1308 if (fp->f_type == DTYPE_VNODE && (vp->v_flag & VISTTY)) 1309 return (0); 1310 break; 1311 } 1312 } 1313 1314 if ((pledge & PLEDGE_ROUTE)) { 1315 switch (com) { 1316 case SIOCGIFADDR: 1317 case SIOCGIFAFLAG_IN6: 1318 case SIOCGIFALIFETIME_IN6: 1319 case SIOCGIFDESCR: 1320 case SIOCGIFFLAGS: 1321 case SIOCGIFMETRIC: 1322 case SIOCGIFGMEMB: 1323 case SIOCGIFRDOMAIN: 1324 case SIOCGIFDSTADDR_IN6: 1325 case SIOCGIFNETMASK_IN6: 1326 case SIOCGIFXFLAGS: 1327 case SIOCGNBRINFO_IN6: 1328 case SIOCGIFINFO_IN6: 1329 case SIOCGIFMEDIA: 1330 if (fp->f_type == DTYPE_SOCKET) 1331 return (0); 1332 break; 1333 } 1334 } 1335 1336 if ((pledge & PLEDGE_WROUTE)) { 1337 switch (com) { 1338 case SIOCAIFADDR: 1339 case SIOCDIFADDR: 1340 case SIOCAIFADDR_IN6: 1341 case SIOCDIFADDR_IN6: 1342 if (fp->f_type == DTYPE_SOCKET) 1343 return (0); 1344 break; 1345 case SIOCSIFMTU: 1346 if (fp->f_type == DTYPE_SOCKET) 1347 return (0); 1348 break; 1349 } 1350 } 1351 1352 #if NVMM > 0 1353 if ((pledge & PLEDGE_VMM)) { 1354 if ((fp->f_type == DTYPE_VNODE) && 1355 (vp->v_type == VCHR) && 1356 (cdevsw[major(vp->v_rdev)].d_open == vmmopen)) { 1357 error = pledge_ioctl_vmm(p, com); 1358 if (error == 0) 1359 return 0; 1360 } 1361 } 1362 #endif 1363 1364 return pledge_fail(p, error, PLEDGE_TTY); 1365 } 1366 1367 int 1368 pledge_sockopt(struct proc *p, int set, int level, int optname) 1369 { 1370 uint64_t pledge; 1371 1372 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1373 return (0); 1374 pledge = READ_ONCE(p->p_p->ps_pledge); 1375 1376 /* Always allow these, which are too common to reject */ 1377 switch (level) { 1378 case SOL_SOCKET: 1379 switch (optname) { 1380 case SO_RCVBUF: 1381 case SO_ERROR: 1382 return 0; 1383 } 1384 break; 1385 } 1386 1387 if ((pledge & PLEDGE_WROUTE)) { 1388 switch (level) { 1389 case SOL_SOCKET: 1390 switch (optname) { 1391 case SO_RTABLE: 1392 return (0); 1393 } 1394 } 1395 } 1396 1397 if ((pledge & (PLEDGE_INET|PLEDGE_UNIX|PLEDGE_DNS)) == 0) 1398 return pledge_fail(p, EPERM, PLEDGE_INET); 1399 /* In use by some service libraries */ 1400 switch (level) { 1401 case SOL_SOCKET: 1402 switch (optname) { 1403 case SO_TIMESTAMP: 1404 return 0; 1405 } 1406 break; 1407 } 1408 1409 /* DNS resolver may do these requests */ 1410 if ((pledge & PLEDGE_DNS)) { 1411 switch (level) { 1412 case IPPROTO_IPV6: 1413 switch (optname) { 1414 case IPV6_RECVPKTINFO: 1415 case IPV6_USE_MIN_MTU: 1416 return (0); 1417 } 1418 } 1419 } 1420 1421 if ((pledge & (PLEDGE_INET|PLEDGE_UNIX)) == 0) 1422 return pledge_fail(p, EPERM, PLEDGE_INET); 1423 switch (level) { 1424 case SOL_SOCKET: 1425 switch (optname) { 1426 case SO_RTABLE: 1427 return pledge_fail(p, EINVAL, PLEDGE_WROUTE); 1428 } 1429 return (0); 1430 } 1431 1432 if ((pledge & PLEDGE_INET) == 0) 1433 return pledge_fail(p, EPERM, PLEDGE_INET); 1434 switch (level) { 1435 case IPPROTO_TCP: 1436 switch (optname) { 1437 case TCP_NODELAY: 1438 case TCP_MD5SIG: 1439 case TCP_SACK_ENABLE: 1440 case TCP_MAXSEG: 1441 case TCP_NOPUSH: 1442 return (0); 1443 } 1444 break; 1445 case IPPROTO_IP: 1446 switch (optname) { 1447 case IP_OPTIONS: 1448 if (!set) 1449 return (0); 1450 break; 1451 case IP_TOS: 1452 case IP_TTL: 1453 case IP_MINTTL: 1454 case IP_IPDEFTTL: 1455 case IP_PORTRANGE: 1456 case IP_RECVDSTADDR: 1457 case IP_RECVDSTPORT: 1458 return (0); 1459 case IP_MULTICAST_IF: 1460 case IP_MULTICAST_TTL: 1461 case IP_MULTICAST_LOOP: 1462 case IP_ADD_MEMBERSHIP: 1463 case IP_DROP_MEMBERSHIP: 1464 if (pledge & PLEDGE_MCAST) 1465 return (0); 1466 break; 1467 } 1468 break; 1469 case IPPROTO_ICMP: 1470 break; 1471 case IPPROTO_IPV6: 1472 switch (optname) { 1473 case IPV6_TCLASS: 1474 case IPV6_UNICAST_HOPS: 1475 case IPV6_MINHOPCOUNT: 1476 case IPV6_RECVHOPLIMIT: 1477 case IPV6_PORTRANGE: 1478 case IPV6_RECVPKTINFO: 1479 case IPV6_RECVDSTPORT: 1480 case IPV6_V6ONLY: 1481 return (0); 1482 case IPV6_MULTICAST_IF: 1483 case IPV6_MULTICAST_HOPS: 1484 case IPV6_MULTICAST_LOOP: 1485 case IPV6_JOIN_GROUP: 1486 case IPV6_LEAVE_GROUP: 1487 if (pledge & PLEDGE_MCAST) 1488 return (0); 1489 break; 1490 } 1491 break; 1492 case IPPROTO_ICMPV6: 1493 break; 1494 } 1495 return pledge_fail(p, EPERM, PLEDGE_INET); 1496 } 1497 1498 int 1499 pledge_socket(struct proc *p, int domain, unsigned int state) 1500 { 1501 uint64_t pledge; 1502 1503 if (!ISSET(p->p_p->ps_flags, PS_PLEDGE)) 1504 return 0; 1505 pledge = READ_ONCE(p->p_p->ps_pledge); 1506 1507 if (ISSET(state, SS_DNS)) { 1508 if (ISSET(pledge, PLEDGE_DNS)) 1509 return 0; 1510 return pledge_fail(p, EPERM, PLEDGE_DNS); 1511 } 1512 1513 switch (domain) { 1514 case -1: /* accept on any domain */ 1515 return (0); 1516 case AF_INET: 1517 case AF_INET6: 1518 if (ISSET(pledge, PLEDGE_INET)) 1519 return 0; 1520 return pledge_fail(p, EPERM, PLEDGE_INET); 1521 1522 case AF_UNIX: 1523 if (ISSET(pledge, PLEDGE_UNIX)) 1524 return 0; 1525 return pledge_fail(p, EPERM, PLEDGE_UNIX); 1526 } 1527 1528 return pledge_fail(p, EINVAL, PLEDGE_INET); 1529 } 1530 1531 int 1532 pledge_flock(struct proc *p) 1533 { 1534 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1535 return (0); 1536 1537 if ((p->p_p->ps_pledge & PLEDGE_FLOCK)) 1538 return (0); 1539 return (pledge_fail(p, EPERM, PLEDGE_FLOCK)); 1540 } 1541 1542 int 1543 pledge_swapctl(struct proc *p, int cmd) 1544 { 1545 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1546 return (0); 1547 1548 if (p->p_p->ps_pledge & PLEDGE_VMINFO) { 1549 switch (cmd) { 1550 case SWAP_NSWAP: 1551 case SWAP_STATS: 1552 return (0); 1553 } 1554 } 1555 1556 return pledge_fail(p, EPERM, PLEDGE_VMINFO); 1557 } 1558 1559 /* bsearch over pledgereq. return flags value if found, 0 else */ 1560 uint64_t 1561 pledgereq_flags(const char *req_name) 1562 { 1563 int base = 0, cmp, i, lim; 1564 1565 for (lim = nitems(pledgereq); lim != 0; lim >>= 1) { 1566 i = base + (lim >> 1); 1567 cmp = strcmp(req_name, pledgereq[i].name); 1568 if (cmp == 0) 1569 return (pledgereq[i].flags); 1570 if (cmp > 0) { /* not found before, move right */ 1571 base = i + 1; 1572 lim--; 1573 } /* else move left */ 1574 } 1575 return (0); 1576 } 1577 1578 int 1579 pledge_fcntl(struct proc *p, int cmd) 1580 { 1581 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1582 return (0); 1583 if ((p->p_p->ps_pledge & PLEDGE_PROC) == 0 && cmd == F_SETOWN) 1584 return pledge_fail(p, EPERM, PLEDGE_PROC); 1585 return (0); 1586 } 1587 1588 int 1589 pledge_kill(struct proc *p, pid_t pid) 1590 { 1591 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1592 return 0; 1593 if (p->p_p->ps_pledge & PLEDGE_PROC) 1594 return 0; 1595 if (pid == 0 || pid == p->p_p->ps_pid) 1596 return 0; 1597 return pledge_fail(p, EPERM, PLEDGE_PROC); 1598 } 1599 1600 int 1601 pledge_protexec(struct proc *p, int prot) 1602 { 1603 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1604 return 0; 1605 /* Before kbind(2) call, ld.so and crt may create EXEC mappings */ 1606 if (p->p_p->ps_kbind_addr == 0 && p->p_p->ps_kbind_cookie == 0) 1607 return 0; 1608 if (!(p->p_p->ps_pledge & PLEDGE_PROTEXEC) && (prot & PROT_EXEC)) 1609 return pledge_fail(p, EPERM, PLEDGE_PROTEXEC); 1610 return 0; 1611 } 1612 1613 int 1614 canonpath(const char *input, char *buf, size_t bufsize) 1615 { 1616 const char *p; 1617 char *q; 1618 1619 /* can't canon relative paths, don't bother */ 1620 if (input[0] != '/') { 1621 if (strlcpy(buf, input, bufsize) >= bufsize) 1622 return ENAMETOOLONG; 1623 return 0; 1624 } 1625 1626 p = input; 1627 q = buf; 1628 while (*p && (q - buf < bufsize)) { 1629 if (p[0] == '/' && (p[1] == '/' || p[1] == '\0')) { 1630 p += 1; 1631 1632 } else if (p[0] == '/' && p[1] == '.' && 1633 (p[2] == '/' || p[2] == '\0')) { 1634 p += 2; 1635 1636 } else if (p[0] == '/' && p[1] == '.' && p[2] == '.' && 1637 (p[3] == '/' || p[3] == '\0')) { 1638 p += 3; 1639 if (q != buf) /* "/../" at start of buf */ 1640 while (*--q != '/') 1641 continue; 1642 1643 } else { 1644 *q++ = *p++; 1645 } 1646 } 1647 if ((*p == '\0') && (q - buf < bufsize)) { 1648 *q = 0; 1649 return 0; 1650 } else 1651 return ENAMETOOLONG; 1652 } 1653