1 /* $OpenBSD: kern_pledge.c,v 1.270 2021/02/03 22:46:55 tobhe 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_msyscall] = PLEDGE_ALWAYS, 115 [SYS___get_tcb] = PLEDGE_ALWAYS, 116 [SYS___set_tcb] = PLEDGE_ALWAYS, 117 [SYS_pledge] = PLEDGE_ALWAYS, 118 [SYS_sendsyslog] = PLEDGE_ALWAYS, /* stack protector reporting */ 119 [SYS_thrkill] = PLEDGE_ALWAYS, /* raise, abort, stack pro */ 120 [SYS_utrace] = PLEDGE_ALWAYS, /* ltrace(1) from ld.so */ 121 122 /* "getting" information about self is considered safe */ 123 [SYS_getuid] = PLEDGE_STDIO, 124 [SYS_geteuid] = PLEDGE_STDIO, 125 [SYS_getresuid] = PLEDGE_STDIO, 126 [SYS_getgid] = PLEDGE_STDIO, 127 [SYS_getegid] = PLEDGE_STDIO, 128 [SYS_getresgid] = PLEDGE_STDIO, 129 [SYS_getgroups] = PLEDGE_STDIO, 130 [SYS_getlogin_r] = PLEDGE_STDIO, 131 [SYS_getpgrp] = PLEDGE_STDIO, 132 [SYS_getpgid] = PLEDGE_STDIO, 133 [SYS_getppid] = PLEDGE_STDIO, 134 [SYS_getsid] = PLEDGE_STDIO, 135 [SYS_getthrid] = PLEDGE_STDIO, 136 [SYS_getrlimit] = PLEDGE_STDIO, 137 [SYS_getrtable] = PLEDGE_STDIO, 138 [SYS_gettimeofday] = PLEDGE_STDIO, 139 [SYS_getdtablecount] = PLEDGE_STDIO, 140 [SYS_getrusage] = PLEDGE_STDIO, 141 [SYS_issetugid] = PLEDGE_STDIO, 142 [SYS_clock_getres] = PLEDGE_STDIO, 143 [SYS_clock_gettime] = PLEDGE_STDIO, 144 [SYS_getpid] = PLEDGE_STDIO, 145 146 /* 147 * Almost exclusively read-only, Very narrow subset. 148 * Use of "route", "inet", "dns", "ps", or "vminfo" 149 * expands access. 150 */ 151 [SYS_sysctl] = PLEDGE_STDIO, 152 153 /* Support for malloc(3) family of operations */ 154 [SYS_getentropy] = PLEDGE_STDIO, 155 [SYS_madvise] = PLEDGE_STDIO, 156 [SYS_minherit] = PLEDGE_STDIO, 157 [SYS_mmap] = PLEDGE_STDIO, 158 [SYS_mprotect] = PLEDGE_STDIO, 159 [SYS_mquery] = PLEDGE_STDIO, 160 [SYS_munmap] = PLEDGE_STDIO, 161 [SYS_msync] = PLEDGE_STDIO, 162 [SYS_break] = PLEDGE_STDIO, 163 164 [SYS_umask] = PLEDGE_STDIO, 165 166 /* read/write operations */ 167 [SYS_read] = PLEDGE_STDIO, 168 [SYS_readv] = PLEDGE_STDIO, 169 [SYS_pread] = PLEDGE_STDIO, 170 [SYS_preadv] = PLEDGE_STDIO, 171 [SYS_write] = PLEDGE_STDIO, 172 [SYS_writev] = PLEDGE_STDIO, 173 [SYS_pwrite] = PLEDGE_STDIO, 174 [SYS_pwritev] = PLEDGE_STDIO, 175 [SYS_recvmsg] = PLEDGE_STDIO, 176 [SYS_recvfrom] = PLEDGE_STDIO | PLEDGE_YPACTIVE, 177 [SYS_ftruncate] = PLEDGE_STDIO, 178 [SYS_lseek] = PLEDGE_STDIO, 179 [SYS_fpathconf] = PLEDGE_STDIO, 180 181 /* 182 * Address selection required a network pledge ("inet", 183 * "unix", "dns". 184 */ 185 [SYS_sendto] = PLEDGE_STDIO | PLEDGE_YPACTIVE, 186 187 /* 188 * Address specification required a network pledge ("inet", 189 * "unix", "dns". SCM_RIGHTS requires "sendfd" or "recvfd". 190 */ 191 [SYS_sendmsg] = PLEDGE_STDIO, 192 193 /* Common signal operations */ 194 [SYS_nanosleep] = PLEDGE_STDIO, 195 [SYS_sigaltstack] = PLEDGE_STDIO, 196 [SYS_sigprocmask] = PLEDGE_STDIO, 197 [SYS_sigsuspend] = PLEDGE_STDIO, 198 [SYS_sigaction] = PLEDGE_STDIO, 199 [SYS_sigreturn] = PLEDGE_STDIO, 200 [SYS_sigpending] = PLEDGE_STDIO, 201 [SYS_getitimer] = PLEDGE_STDIO, 202 [SYS_setitimer] = PLEDGE_STDIO, 203 204 /* 205 * To support event driven programming. 206 */ 207 [SYS_poll] = PLEDGE_STDIO, 208 [SYS_ppoll] = PLEDGE_STDIO, 209 [SYS_kevent] = PLEDGE_STDIO, 210 [SYS_kqueue] = PLEDGE_STDIO, 211 [SYS_select] = PLEDGE_STDIO, 212 [SYS_pselect] = PLEDGE_STDIO, 213 214 [SYS_fstat] = PLEDGE_STDIO, 215 [SYS_fsync] = PLEDGE_STDIO, 216 217 [SYS_setsockopt] = PLEDGE_STDIO, /* narrow whitelist */ 218 [SYS_getsockopt] = PLEDGE_STDIO, /* narrow whitelist */ 219 220 /* F_SETOWN requires PLEDGE_PROC */ 221 [SYS_fcntl] = PLEDGE_STDIO, 222 223 [SYS_close] = PLEDGE_STDIO, 224 [SYS_dup] = PLEDGE_STDIO, 225 [SYS_dup2] = PLEDGE_STDIO, 226 [SYS_dup3] = PLEDGE_STDIO, 227 [SYS_closefrom] = PLEDGE_STDIO, 228 [SYS_shutdown] = PLEDGE_STDIO, 229 [SYS_fchdir] = PLEDGE_STDIO, /* XXX consider tightening */ 230 231 [SYS_pipe] = PLEDGE_STDIO, 232 [SYS_pipe2] = PLEDGE_STDIO, 233 [SYS_socketpair] = PLEDGE_STDIO, 234 235 [SYS_wait4] = PLEDGE_STDIO, 236 237 /* 238 * Can kill self with "stdio". Killing another pid 239 * requires "proc" 240 */ 241 [SYS_kill] = PLEDGE_STDIO, 242 243 /* 244 * FIONREAD/FIONBIO for "stdio" 245 * Other ioctl are selectively allowed based upon other pledges. 246 */ 247 [SYS_ioctl] = PLEDGE_STDIO, 248 249 /* 250 * Path access/creation calls encounter many extensive 251 * checks done during pledge_namei() 252 */ 253 [SYS_open] = PLEDGE_STDIO, 254 [SYS_stat] = PLEDGE_STDIO, 255 [SYS_access] = PLEDGE_STDIO, 256 [SYS_readlink] = PLEDGE_STDIO, 257 [SYS___realpath] = PLEDGE_STDIO, 258 259 [SYS_adjtime] = PLEDGE_STDIO, /* setting requires "settime" */ 260 [SYS_adjfreq] = PLEDGE_SETTIME, 261 [SYS_settimeofday] = PLEDGE_SETTIME, 262 263 /* 264 * Needed by threaded programs 265 * XXX should we have a new "threads"? 266 */ 267 [SYS___tfork] = PLEDGE_STDIO, 268 [SYS_sched_yield] = PLEDGE_STDIO, 269 [SYS_futex] = PLEDGE_STDIO, 270 [SYS___thrsleep] = PLEDGE_STDIO, 271 [SYS___thrwakeup] = PLEDGE_STDIO, 272 [SYS___threxit] = PLEDGE_STDIO, 273 [SYS___thrsigdivert] = PLEDGE_STDIO, 274 275 [SYS_fork] = PLEDGE_PROC, 276 [SYS_vfork] = PLEDGE_PROC, 277 [SYS_setpgid] = PLEDGE_PROC, 278 [SYS_setsid] = PLEDGE_PROC, 279 280 [SYS_setrlimit] = PLEDGE_PROC | PLEDGE_ID, 281 [SYS_getpriority] = PLEDGE_PROC | PLEDGE_ID, 282 283 [SYS_setpriority] = PLEDGE_PROC | PLEDGE_ID, 284 285 [SYS_setuid] = PLEDGE_ID, 286 [SYS_seteuid] = PLEDGE_ID, 287 [SYS_setreuid] = PLEDGE_ID, 288 [SYS_setresuid] = PLEDGE_ID, 289 [SYS_setgid] = PLEDGE_ID, 290 [SYS_setegid] = PLEDGE_ID, 291 [SYS_setregid] = PLEDGE_ID, 292 [SYS_setresgid] = PLEDGE_ID, 293 [SYS_setgroups] = PLEDGE_ID, 294 [SYS_setlogin] = PLEDGE_ID, 295 296 [SYS_unveil] = PLEDGE_UNVEIL, 297 298 [SYS_execve] = PLEDGE_EXEC, 299 300 [SYS_chdir] = PLEDGE_RPATH, 301 [SYS_openat] = PLEDGE_RPATH | PLEDGE_WPATH, 302 [SYS_fstatat] = PLEDGE_RPATH | PLEDGE_WPATH, 303 [SYS_faccessat] = PLEDGE_RPATH | PLEDGE_WPATH, 304 [SYS_readlinkat] = PLEDGE_RPATH | PLEDGE_WPATH, 305 [SYS_lstat] = PLEDGE_RPATH | PLEDGE_WPATH | PLEDGE_TMPPATH, 306 [SYS_truncate] = PLEDGE_WPATH, 307 [SYS_rename] = PLEDGE_RPATH | PLEDGE_CPATH, 308 [SYS_rmdir] = PLEDGE_CPATH, 309 [SYS_renameat] = PLEDGE_CPATH, 310 [SYS_link] = PLEDGE_CPATH, 311 [SYS_linkat] = PLEDGE_CPATH, 312 [SYS_symlink] = PLEDGE_CPATH, 313 [SYS_symlinkat] = PLEDGE_CPATH, 314 [SYS_unlink] = PLEDGE_CPATH | PLEDGE_TMPPATH, 315 [SYS_unlinkat] = PLEDGE_CPATH, 316 [SYS_mkdir] = PLEDGE_CPATH, 317 [SYS_mkdirat] = PLEDGE_CPATH, 318 319 [SYS_mkfifo] = PLEDGE_DPATH, 320 [SYS_mkfifoat] = PLEDGE_DPATH, 321 [SYS_mknod] = PLEDGE_DPATH, 322 [SYS_mknodat] = PLEDGE_DPATH, 323 324 [SYS_revoke] = PLEDGE_TTY, /* also requires PLEDGE_RPATH */ 325 326 /* 327 * Classify as RPATH|WPATH, because of path information leakage. 328 * WPATH due to unknown use of mk*temp(3) on non-/tmp paths.. 329 */ 330 [SYS___getcwd] = PLEDGE_RPATH | PLEDGE_WPATH, 331 332 /* Classify as RPATH, because these leak path information */ 333 [SYS_getdents] = PLEDGE_RPATH, 334 [SYS_getfsstat] = PLEDGE_RPATH, 335 [SYS_statfs] = PLEDGE_RPATH, 336 [SYS_fstatfs] = PLEDGE_RPATH, 337 [SYS_pathconf] = PLEDGE_RPATH, 338 339 [SYS_utimes] = PLEDGE_FATTR, 340 [SYS_futimes] = PLEDGE_FATTR, 341 [SYS_utimensat] = PLEDGE_FATTR, 342 [SYS_futimens] = PLEDGE_FATTR, 343 [SYS_chmod] = PLEDGE_FATTR, 344 [SYS_fchmod] = PLEDGE_FATTR, 345 [SYS_fchmodat] = PLEDGE_FATTR, 346 [SYS_chflags] = PLEDGE_FATTR, 347 [SYS_chflagsat] = PLEDGE_FATTR, 348 [SYS_fchflags] = PLEDGE_FATTR, 349 350 [SYS_chown] = PLEDGE_CHOWN, 351 [SYS_fchownat] = PLEDGE_CHOWN, 352 [SYS_lchown] = PLEDGE_CHOWN, 353 [SYS_fchown] = PLEDGE_CHOWN, 354 355 [SYS_socket] = PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS | PLEDGE_YPACTIVE, 356 [SYS_connect] = PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS | PLEDGE_YPACTIVE, 357 [SYS_bind] = PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS | PLEDGE_YPACTIVE, 358 [SYS_getsockname] = PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS | PLEDGE_YPACTIVE, 359 360 [SYS_listen] = PLEDGE_INET | PLEDGE_UNIX, 361 [SYS_accept4] = PLEDGE_INET | PLEDGE_UNIX, 362 [SYS_accept] = PLEDGE_INET | PLEDGE_UNIX, 363 [SYS_getpeername] = PLEDGE_INET | PLEDGE_UNIX, 364 365 [SYS_flock] = PLEDGE_FLOCK | PLEDGE_YPACTIVE, 366 367 [SYS_swapctl] = PLEDGE_VMINFO, /* XXX should limit to "get" operations */ 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; 459 460 if (SCARG(uap, promises)) { 461 error = parsepledges(p, "pledgereq", 462 SCARG(uap, promises), &promises); 463 if (error) 464 return (error); 465 466 /* In "error" mode, ignore promise increase requests, 467 * but accept promise decrease requests */ 468 if (ISSET(pr->ps_flags, PS_PLEDGE) && 469 (pr->ps_pledge & PLEDGE_ERROR)) 470 promises &= (pr->ps_pledge & PLEDGE_USERSET); 471 472 /* Only permit reductions */ 473 if (ISSET(pr->ps_flags, PS_PLEDGE) && 474 (((promises | pr->ps_pledge) != pr->ps_pledge))) 475 return (EPERM); 476 } 477 if (SCARG(uap, execpromises)) { 478 error = parsepledges(p, "pledgeexecreq", 479 SCARG(uap, execpromises), &execpromises); 480 if (error) 481 return (error); 482 483 /* Only permit reductions */ 484 if (ISSET(pr->ps_flags, PS_EXECPLEDGE) && 485 (((execpromises | pr->ps_execpledge) != pr->ps_execpledge))) 486 return (EPERM); 487 } 488 489 if (SCARG(uap, promises)) { 490 pr->ps_pledge = promises; 491 atomic_setbits_int(&pr->ps_flags, PS_PLEDGE); 492 /* 493 * Kill off unveil and drop unveil vnode refs if we no 494 * longer are holding any path-accessing pledge 495 */ 496 if ((pr->ps_pledge & (PLEDGE_RPATH | PLEDGE_WPATH | 497 PLEDGE_CPATH | PLEDGE_DPATH | PLEDGE_TMPPATH | PLEDGE_EXEC | 498 PLEDGE_UNIX | PLEDGE_UNVEIL)) == 0) 499 unveil_destroy(pr); 500 } 501 if (SCARG(uap, execpromises)) { 502 pr->ps_execpledge = execpromises; 503 atomic_setbits_int(&pr->ps_flags, PS_EXECPLEDGE); 504 } 505 return (0); 506 } 507 508 int 509 pledge_syscall(struct proc *p, int code, uint64_t *tval) 510 { 511 p->p_pledge_syscall = code; 512 *tval = 0; 513 514 if (code < 0 || code > SYS_MAXSYSCALL - 1) 515 return (EINVAL); 516 517 if (pledge_syscalls[code] == PLEDGE_ALWAYS) 518 return (0); 519 520 if (p->p_p->ps_pledge & pledge_syscalls[code]) 521 return (0); 522 523 *tval = pledge_syscalls[code]; 524 return (EPERM); 525 } 526 527 int 528 pledge_fail(struct proc *p, int error, uint64_t code) 529 { 530 const char *codes = ""; 531 int i; 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 sigabort(p); 553 554 p->p_p->ps_pledge = 0; /* Disable all PLEDGE_ flags */ 555 KERNEL_UNLOCK(); 556 return (error); 557 } 558 559 /* 560 * Need to make it more obvious that one cannot get through here 561 * without the right flags set 562 */ 563 int 564 pledge_namei(struct proc *p, struct nameidata *ni, char *origpath) 565 { 566 char path[PATH_MAX]; 567 int error; 568 569 if ((p->p_p->ps_flags & PS_PLEDGE) == 0 || 570 (p->p_p->ps_flags & PS_COREDUMP)) 571 return (0); 572 573 if (ni->ni_pledge == 0) 574 panic("pledge_namei: ni_pledge"); 575 576 /* 577 * We set the BYPASSUNVEIL flag to skip unveil checks 578 * as necessary 579 */ 580 581 /* Doing a permitted execve() */ 582 if ((ni->ni_pledge & PLEDGE_EXEC) && 583 (p->p_p->ps_pledge & PLEDGE_EXEC)) 584 return (0); 585 586 error = canonpath(origpath, path, sizeof(path)); 587 if (error) 588 return (error); 589 590 /* Detect what looks like a mkstemp(3) family operation */ 591 if ((p->p_p->ps_pledge & PLEDGE_TMPPATH) && 592 (p->p_pledge_syscall == SYS_open) && 593 (ni->ni_pledge & PLEDGE_CPATH) && 594 strncmp(path, "/tmp/", sizeof("/tmp/") - 1) == 0) { 595 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 596 return (0); 597 } 598 599 /* Allow unlinking of a mkstemp(3) file... 600 * Good opportunity for strict checks here. 601 */ 602 if ((p->p_p->ps_pledge & PLEDGE_TMPPATH) && 603 (p->p_pledge_syscall == SYS_unlink) && 604 strncmp(path, "/tmp/", sizeof("/tmp/") - 1) == 0) { 605 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 606 return (0); 607 } 608 609 /* Whitelisted paths */ 610 switch (p->p_pledge_syscall) { 611 case SYS_access: 612 /* tzset() needs this. */ 613 if (ni->ni_pledge == PLEDGE_RPATH && 614 strcmp(path, "/etc/localtime") == 0) { 615 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 616 return (0); 617 } 618 619 /* when avoiding YP mode, getpw* functions touch this */ 620 if (ni->ni_pledge == PLEDGE_RPATH && 621 strcmp(path, "/var/run/ypbind.lock") == 0) { 622 if ((p->p_p->ps_pledge & PLEDGE_GETPW) || 623 (ni->ni_unveil == UNVEIL_INSPECT)) { 624 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 625 return (0); 626 } else 627 return (pledge_fail(p, error, PLEDGE_GETPW)); 628 } 629 break; 630 case SYS_open: 631 /* daemon(3) or other such functions */ 632 if ((ni->ni_pledge & ~(PLEDGE_RPATH | PLEDGE_WPATH)) == 0 && 633 strcmp(path, "/dev/null") == 0) { 634 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 635 return (0); 636 } 637 638 /* readpassphrase(3), getpass(3) */ 639 if ((p->p_p->ps_pledge & PLEDGE_TTY) && 640 (ni->ni_pledge & ~(PLEDGE_RPATH | PLEDGE_WPATH)) == 0 && 641 strcmp(path, "/dev/tty") == 0) { 642 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 643 return (0); 644 } 645 646 /* getpw* and friends need a few files */ 647 if ((ni->ni_pledge == PLEDGE_RPATH) && 648 (p->p_p->ps_pledge & PLEDGE_GETPW)) { 649 if (strcmp(path, "/etc/spwd.db") == 0) 650 return (EPERM); /* don't call pledge_fail */ 651 if (strcmp(path, "/etc/pwd.db") == 0) { 652 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 653 return (0); 654 } 655 if (strcmp(path, "/etc/group") == 0) { 656 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 657 return (0); 658 } 659 if (strcmp(path, "/etc/netid") == 0) { 660 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 661 return (0); 662 } 663 } 664 665 /* DNS needs /etc/{resolv.conf,hosts,services,protocols}. */ 666 if ((ni->ni_pledge == PLEDGE_RPATH) && 667 (p->p_p->ps_pledge & PLEDGE_DNS)) { 668 if (strcmp(path, "/etc/resolv.conf") == 0) { 669 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 670 return (0); 671 } 672 if (strcmp(path, "/etc/hosts") == 0) { 673 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 674 return (0); 675 } 676 if (strcmp(path, "/etc/services") == 0) { 677 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 678 return (0); 679 } 680 if (strcmp(path, "/etc/protocols") == 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_stat: 723 /* DNS needs /etc/resolv.conf. */ 724 if ((ni->ni_pledge == PLEDGE_RPATH) && 725 (p->p_p->ps_pledge & PLEDGE_DNS) && 726 strcmp(path, "/etc/resolv.conf") == 0) { 727 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 728 return (0); 729 } 730 break; 731 } 732 733 /* 734 * Ensure each flag of ni_pledge has counterpart allowing it in 735 * ps_pledge. 736 */ 737 if (ni->ni_pledge & ~p->p_p->ps_pledge) 738 return (pledge_fail(p, EPERM, (ni->ni_pledge & ~p->p_p->ps_pledge))); 739 740 /* continue, and check unveil if present */ 741 return (0); 742 } 743 744 /* 745 * Only allow reception of safe file descriptors. 746 */ 747 int 748 pledge_recvfd(struct proc *p, struct file *fp) 749 { 750 struct vnode *vp; 751 752 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 753 return (0); 754 if ((p->p_p->ps_pledge & PLEDGE_RECVFD) == 0) 755 return pledge_fail(p, EPERM, PLEDGE_RECVFD); 756 757 switch (fp->f_type) { 758 case DTYPE_SOCKET: 759 case DTYPE_PIPE: 760 case DTYPE_DMABUF: 761 return (0); 762 case DTYPE_VNODE: 763 vp = fp->f_data; 764 765 if (vp->v_type != VDIR) 766 return (0); 767 } 768 return pledge_fail(p, EINVAL, PLEDGE_RECVFD); 769 } 770 771 /* 772 * Only allow sending of safe file descriptors. 773 */ 774 int 775 pledge_sendfd(struct proc *p, struct file *fp) 776 { 777 struct vnode *vp; 778 779 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 780 return (0); 781 if ((p->p_p->ps_pledge & PLEDGE_SENDFD) == 0) 782 return pledge_fail(p, EPERM, PLEDGE_SENDFD); 783 784 switch (fp->f_type) { 785 case DTYPE_SOCKET: 786 case DTYPE_PIPE: 787 case DTYPE_DMABUF: 788 return (0); 789 case DTYPE_VNODE: 790 vp = fp->f_data; 791 792 if (vp->v_type != VDIR) 793 return (0); 794 break; 795 } 796 return pledge_fail(p, EINVAL, PLEDGE_SENDFD); 797 } 798 799 int 800 pledge_sysctl(struct proc *p, int miblen, int *mib, void *new) 801 { 802 char buf[80]; 803 int i; 804 805 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 806 return (0); 807 808 if (new) 809 return pledge_fail(p, EFAULT, 0); 810 811 /* routing table observation */ 812 if ((p->p_p->ps_pledge & PLEDGE_ROUTE)) { 813 if ((miblen == 6 || miblen == 7) && 814 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 815 mib[2] == 0 && 816 mib[4] == NET_RT_DUMP) 817 return (0); 818 819 if (miblen == 6 && 820 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 821 mib[2] == 0 && 822 (mib[3] == 0 || mib[3] == AF_INET6 || mib[3] == AF_INET) && 823 (mib[4] == NET_RT_TABLE || mib[4] == NET_RT_SOURCE)) 824 return (0); 825 826 if (miblen == 7 && /* exposes MACs */ 827 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 828 mib[2] == 0 && 829 (mib[3] == 0 || mib[3] == AF_INET6 || mib[3] == AF_INET) && 830 mib[4] == NET_RT_FLAGS && mib[5] == RTF_LLINFO) 831 return (0); 832 } 833 834 if ((p->p_p->ps_pledge & PLEDGE_WROUTE)) { 835 if (miblen == 4 && 836 mib[0] == CTL_NET && mib[1] == PF_INET6 && 837 mib[2] == IPPROTO_IPV6 && mib[3] == IPV6CTL_SOIIKEY) 838 return (0); 839 } 840 841 if (p->p_p->ps_pledge & (PLEDGE_PS | PLEDGE_VMINFO)) { 842 if (miblen == 2 && /* kern.fscale */ 843 mib[0] == CTL_KERN && mib[1] == KERN_FSCALE) 844 return (0); 845 if (miblen == 2 && /* kern.boottime */ 846 mib[0] == CTL_KERN && mib[1] == KERN_BOOTTIME) 847 return (0); 848 if (miblen == 2 && /* kern.consdev */ 849 mib[0] == CTL_KERN && mib[1] == KERN_CONSDEV) 850 return (0); 851 if (miblen == 2 && /* kern.cptime */ 852 mib[0] == CTL_KERN && mib[1] == KERN_CPTIME) 853 return (0); 854 if (miblen == 3 && /* kern.cptime2 */ 855 mib[0] == CTL_KERN && mib[1] == KERN_CPTIME2) 856 return (0); 857 if (miblen == 3 && /* kern.cpustats */ 858 mib[0] == CTL_KERN && mib[1] == KERN_CPUSTATS) 859 return (0); 860 } 861 862 if ((p->p_p->ps_pledge & PLEDGE_PS)) { 863 if (miblen == 4 && /* kern.procargs.* */ 864 mib[0] == CTL_KERN && mib[1] == KERN_PROC_ARGS && 865 (mib[3] == KERN_PROC_ARGV || mib[3] == KERN_PROC_ENV)) 866 return (0); 867 if (miblen == 6 && /* kern.proc.* */ 868 mib[0] == CTL_KERN && mib[1] == KERN_PROC) 869 return (0); 870 if (miblen == 3 && /* kern.proc_cwd.* */ 871 mib[0] == CTL_KERN && mib[1] == KERN_PROC_CWD) 872 return (0); 873 if (miblen == 2 && /* kern.ccpu */ 874 mib[0] == CTL_KERN && mib[1] == KERN_CCPU) 875 return (0); 876 if (miblen == 2 && /* vm.maxslp */ 877 mib[0] == CTL_VM && mib[1] == VM_MAXSLP) 878 return (0); 879 } 880 881 if ((p->p_p->ps_pledge & PLEDGE_VMINFO)) { 882 if (miblen == 2 && /* vm.uvmexp */ 883 mib[0] == CTL_VM && mib[1] == VM_UVMEXP) 884 return (0); 885 if (miblen == 3 && /* vfs.generic.bcachestat */ 886 mib[0] == CTL_VFS && mib[1] == VFS_GENERIC && 887 mib[2] == VFS_BCACHESTAT) 888 return (0); 889 } 890 891 if ((p->p_p->ps_pledge & PLEDGE_INET)) { 892 if (miblen == 2 && /* kern.somaxconn */ 893 mib[0] == CTL_KERN && mib[1] == KERN_SOMAXCONN) 894 return (0); 895 } 896 897 if ((p->p_p->ps_pledge & (PLEDGE_ROUTE | PLEDGE_INET | PLEDGE_DNS))) { 898 if (miblen == 6 && /* getifaddrs() */ 899 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 900 mib[2] == 0 && 901 (mib[3] == 0 || mib[3] == AF_INET6 || mib[3] == AF_INET) && 902 mib[4] == NET_RT_IFLIST) 903 return (0); 904 } 905 906 if ((p->p_p->ps_pledge & PLEDGE_DISKLABEL)) { 907 if (miblen == 2 && /* kern.rawpartition */ 908 mib[0] == CTL_KERN && 909 mib[1] == KERN_RAWPARTITION) 910 return (0); 911 if (miblen == 2 && /* kern.maxpartitions */ 912 mib[0] == CTL_KERN && 913 mib[1] == KERN_MAXPARTITIONS) 914 return (0); 915 #ifdef CPU_CHR2BLK 916 if (miblen == 3 && /* machdep.chr2blk */ 917 mib[0] == CTL_MACHDEP && 918 mib[1] == CPU_CHR2BLK) 919 return (0); 920 #endif /* CPU_CHR2BLK */ 921 } 922 923 if (miblen >= 3 && /* ntpd(8) to read sensors */ 924 mib[0] == CTL_HW && mib[1] == HW_SENSORS) 925 return (0); 926 927 if (miblen == 6 && /* if_nameindex() */ 928 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 929 mib[2] == 0 && mib[3] == 0 && mib[4] == NET_RT_IFNAMES) 930 return (0); 931 932 if (miblen == 2) { 933 switch (mib[0]) { 934 case CTL_KERN: 935 switch (mib[1]) { 936 case KERN_DOMAINNAME: /* getdomainname() */ 937 case KERN_HOSTNAME: /* gethostname() */ 938 case KERN_OSTYPE: /* uname() */ 939 case KERN_OSRELEASE: /* uname() */ 940 case KERN_OSVERSION: /* uname() */ 941 case KERN_VERSION: /* uname() */ 942 case KERN_CLOCKRATE: /* kern.clockrate */ 943 case KERN_ARGMAX: /* kern.argmax */ 944 case KERN_NGROUPS: /* kern.ngroups */ 945 case KERN_SYSVSHM: /* kern.sysvshm */ 946 case KERN_POSIX1: /* kern.posix1version */ 947 return (0); 948 } 949 break; 950 case CTL_HW: 951 switch (mib[1]) { 952 case HW_MACHINE: /* uname() */ 953 case HW_PAGESIZE: /* getpagesize() */ 954 case HW_PHYSMEM64: /* hw.physmem */ 955 case HW_NCPU: /* hw.ncpu */ 956 case HW_NCPUONLINE: /* hw.ncpuonline */ 957 return (0); 958 } 959 break; 960 case CTL_VM: 961 switch (mib[1]) { 962 case VM_PSSTRINGS: /* setproctitle() */ 963 case VM_LOADAVG: /* vm.loadavg / getloadavg(3) */ 964 case VM_MALLOC_CONF: /* vm.malloc_conf */ 965 return (0); 966 } 967 break; 968 default: 969 break; 970 } 971 } 972 973 #ifdef CPU_SSE 974 if (miblen == 2 && /* i386 libm tests for SSE */ 975 mib[0] == CTL_MACHDEP && mib[1] == CPU_SSE) 976 return (0); 977 #endif /* CPU_SSE */ 978 979 snprintf(buf, sizeof(buf), "%s(%d): pledge sysctl %d:", 980 p->p_p->ps_comm, p->p_p->ps_pid, miblen); 981 for (i = 0; i < miblen; i++) { 982 char *p = buf + strlen(buf); 983 snprintf(p, sizeof(buf) - (p - buf), " %d", mib[i]); 984 } 985 log(LOG_ERR, "%s\n", buf); 986 987 return pledge_fail(p, EINVAL, 0); 988 } 989 990 int 991 pledge_chown(struct proc *p, uid_t uid, gid_t gid) 992 { 993 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 994 return (0); 995 996 if (p->p_p->ps_pledge & PLEDGE_CHOWNUID) 997 return (0); 998 999 if (uid != -1 && uid != p->p_ucred->cr_uid) 1000 return (EPERM); 1001 if (gid != -1 && !groupmember(gid, p->p_ucred)) 1002 return (EPERM); 1003 return (0); 1004 } 1005 1006 int 1007 pledge_adjtime(struct proc *p, const void *v) 1008 { 1009 const struct timeval *delta = v; 1010 1011 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1012 return (0); 1013 1014 if ((p->p_p->ps_pledge & PLEDGE_SETTIME)) 1015 return (0); 1016 if (delta) 1017 return (EPERM); 1018 return (0); 1019 } 1020 1021 int 1022 pledge_sendit(struct proc *p, const void *to) 1023 { 1024 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1025 return (0); 1026 1027 if ((p->p_p->ps_pledge & (PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS | PLEDGE_YPACTIVE))) 1028 return (0); /* may use address */ 1029 if (to == NULL) 1030 return (0); /* behaves just like write */ 1031 return pledge_fail(p, EPERM, PLEDGE_INET); 1032 } 1033 1034 int 1035 pledge_ioctl(struct proc *p, long com, struct file *fp) 1036 { 1037 struct vnode *vp = NULL; 1038 int error = EPERM; 1039 uint64_t pl = p->p_p->ps_pledge; 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 ((pl & 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 ((pl & 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 ((pl & 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 ((pl & 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 ((pl & 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 case AUDIO_MIXER_DEVINFO: 1123 case AUDIO_MIXER_READ: 1124 case AUDIO_MIXER_WRITE: 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 ((pl & 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 ((pl & 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 case VIDIOC_DQEVENT: 1180 case VIDIOC_ENCODER_CMD: 1181 case VIDIOC_EXPBUF: 1182 case VIDIOC_G_CROP: 1183 case VIDIOC_G_EXT_CTRLS: 1184 case VIDIOC_G_FMT: 1185 case VIDIOC_G_SELECTION: 1186 case VIDIOC_QUERYMENU: 1187 case VIDIOC_SUBSCRIBE_EVENT: 1188 case VIDIOC_S_EXT_CTRLS: 1189 case VIDIOC_S_SELECTION: 1190 case VIDIOC_TRY_DECODER_CMD: 1191 case VIDIOC_TRY_ENCODER_CMD: 1192 if (fp->f_type == DTYPE_VNODE && 1193 vp->v_type == VCHR && 1194 cdevsw[major(vp->v_rdev)].d_open == videoopen) 1195 return (0); 1196 break; 1197 } 1198 } 1199 #endif 1200 1201 #if NPF > 0 1202 if ((pl & PLEDGE_PF)) { 1203 switch (com) { 1204 case DIOCADDRULE: 1205 case DIOCGETSTATUS: 1206 case DIOCNATLOOK: 1207 case DIOCRADDTABLES: 1208 case DIOCRCLRADDRS: 1209 case DIOCRCLRTABLES: 1210 case DIOCRCLRTSTATS: 1211 case DIOCRGETTSTATS: 1212 case DIOCRSETADDRS: 1213 case DIOCXBEGIN: 1214 case DIOCXCOMMIT: 1215 case DIOCKILLSRCNODES: 1216 if ((fp->f_type == DTYPE_VNODE) && 1217 (vp->v_type == VCHR) && 1218 (cdevsw[major(vp->v_rdev)].d_open == pfopen)) 1219 return (0); 1220 break; 1221 } 1222 } 1223 #endif 1224 1225 if ((pl & PLEDGE_TTY)) { 1226 switch (com) { 1227 #if NPTY > 0 1228 case PTMGET: 1229 if ((pl & PLEDGE_RPATH) == 0) 1230 break; 1231 if ((pl & PLEDGE_WPATH) == 0) 1232 break; 1233 if (fp->f_type != DTYPE_VNODE || vp->v_type != VCHR) 1234 break; 1235 if (cdevsw[major(vp->v_rdev)].d_open != ptmopen) 1236 break; 1237 return (0); 1238 case TIOCUCNTL: /* vmd */ 1239 if ((pl & PLEDGE_RPATH) == 0) 1240 break; 1241 if ((pl & PLEDGE_WPATH) == 0) 1242 break; 1243 if (cdevsw[major(vp->v_rdev)].d_open != ptcopen) 1244 break; 1245 return (0); 1246 #endif /* NPTY > 0 */ 1247 case TIOCSPGRP: 1248 if ((pl & PLEDGE_PROC) == 0) 1249 break; 1250 /* FALLTHROUGH */ 1251 case TIOCFLUSH: /* getty, telnet */ 1252 case TIOCSTART: /* emacs, etc */ 1253 case TIOCGPGRP: 1254 case TIOCGETA: 1255 case TIOCGWINSZ: /* ENOTTY return for non-tty */ 1256 case TIOCSTAT: /* csh */ 1257 if (fp->f_type == DTYPE_VNODE && (vp->v_flag & VISTTY)) 1258 return (0); 1259 return (ENOTTY); 1260 case TIOCSWINSZ: 1261 case TIOCEXT: /* mail, libedit .. */ 1262 case TIOCCBRK: /* cu */ 1263 case TIOCSBRK: /* cu */ 1264 case TIOCCDTR: /* cu */ 1265 case TIOCSDTR: /* cu */ 1266 case TIOCEXCL: /* cu */ 1267 case TIOCSETA: /* cu, ... */ 1268 case TIOCSETAW: /* cu, ... */ 1269 case TIOCSETAF: /* tcsetattr TCSAFLUSH, script */ 1270 case TIOCSCTTY: /* forkpty(3), login_tty(3), ... */ 1271 if (fp->f_type == DTYPE_VNODE && (vp->v_flag & VISTTY)) 1272 return (0); 1273 break; 1274 } 1275 } 1276 1277 if ((pl & PLEDGE_ROUTE)) { 1278 switch (com) { 1279 case SIOCGIFADDR: 1280 case SIOCGIFAFLAG_IN6: 1281 case SIOCGIFALIFETIME_IN6: 1282 case SIOCGIFDESCR: 1283 case SIOCGIFFLAGS: 1284 case SIOCGIFMETRIC: 1285 case SIOCGIFGMEMB: 1286 case SIOCGIFRDOMAIN: 1287 case SIOCGIFDSTADDR_IN6: 1288 case SIOCGIFNETMASK_IN6: 1289 case SIOCGIFXFLAGS: 1290 case SIOCGNBRINFO_IN6: 1291 case SIOCGIFINFO_IN6: 1292 case SIOCGIFMEDIA: 1293 if (fp->f_type == DTYPE_SOCKET) 1294 return (0); 1295 break; 1296 } 1297 } 1298 1299 if ((pl & PLEDGE_WROUTE)) { 1300 switch (com) { 1301 case SIOCAIFADDR: 1302 case SIOCDIFADDR: 1303 case SIOCAIFADDR_IN6: 1304 case SIOCDIFADDR_IN6: 1305 if (fp->f_type == DTYPE_SOCKET) 1306 return (0); 1307 break; 1308 case SIOCSIFMTU: 1309 if (fp->f_type == DTYPE_SOCKET) 1310 return (0); 1311 break; 1312 } 1313 } 1314 1315 #if NVMM > 0 1316 if ((pl & PLEDGE_VMM)) { 1317 if ((fp->f_type == DTYPE_VNODE) && 1318 (vp->v_type == VCHR) && 1319 (cdevsw[major(vp->v_rdev)].d_open == vmmopen)) { 1320 error = pledge_ioctl_vmm(p, com); 1321 if (error == 0) 1322 return 0; 1323 } 1324 } 1325 #endif 1326 1327 return pledge_fail(p, error, PLEDGE_TTY); 1328 } 1329 1330 int 1331 pledge_sockopt(struct proc *p, int set, int level, int optname) 1332 { 1333 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1334 return (0); 1335 1336 /* Always allow these, which are too common to reject */ 1337 switch (level) { 1338 case SOL_SOCKET: 1339 switch (optname) { 1340 case SO_RCVBUF: 1341 case SO_ERROR: 1342 return 0; 1343 } 1344 break; 1345 } 1346 1347 if ((p->p_p->ps_pledge & PLEDGE_WROUTE)) { 1348 switch (level) { 1349 case SOL_SOCKET: 1350 switch (optname) { 1351 case SO_RTABLE: 1352 return (0); 1353 } 1354 } 1355 } 1356 1357 if ((p->p_p->ps_pledge & (PLEDGE_INET|PLEDGE_UNIX|PLEDGE_DNS|PLEDGE_YPACTIVE)) == 0) 1358 return pledge_fail(p, EPERM, PLEDGE_INET); 1359 /* In use by some service libraries */ 1360 switch (level) { 1361 case SOL_SOCKET: 1362 switch (optname) { 1363 case SO_TIMESTAMP: 1364 return 0; 1365 } 1366 break; 1367 } 1368 1369 /* DNS resolver may do these requests */ 1370 if ((p->p_p->ps_pledge & PLEDGE_DNS)) { 1371 switch (level) { 1372 case IPPROTO_IPV6: 1373 switch (optname) { 1374 case IPV6_RECVPKTINFO: 1375 case IPV6_USE_MIN_MTU: 1376 return (0); 1377 } 1378 } 1379 } 1380 1381 /* YP may do these requests */ 1382 if (p->p_p->ps_pledge & PLEDGE_YPACTIVE) { 1383 switch (level) { 1384 case IPPROTO_IP: 1385 switch (optname) { 1386 case IP_PORTRANGE: 1387 return (0); 1388 } 1389 break; 1390 1391 case IPPROTO_IPV6: 1392 switch (optname) { 1393 case IPV6_PORTRANGE: 1394 return (0); 1395 } 1396 break; 1397 } 1398 } 1399 1400 if ((p->p_p->ps_pledge & (PLEDGE_INET|PLEDGE_UNIX)) == 0) 1401 return pledge_fail(p, EPERM, PLEDGE_INET); 1402 switch (level) { 1403 case SOL_SOCKET: 1404 switch (optname) { 1405 case SO_RTABLE: 1406 return pledge_fail(p, EINVAL, PLEDGE_WROUTE); 1407 } 1408 return (0); 1409 } 1410 1411 if ((p->p_p->ps_pledge & PLEDGE_INET) == 0) 1412 return pledge_fail(p, EPERM, PLEDGE_INET); 1413 switch (level) { 1414 case IPPROTO_TCP: 1415 switch (optname) { 1416 case TCP_NODELAY: 1417 case TCP_MD5SIG: 1418 case TCP_SACK_ENABLE: 1419 case TCP_MAXSEG: 1420 case TCP_NOPUSH: 1421 return (0); 1422 } 1423 break; 1424 case IPPROTO_IP: 1425 switch (optname) { 1426 case IP_OPTIONS: 1427 if (!set) 1428 return (0); 1429 break; 1430 case IP_TOS: 1431 case IP_TTL: 1432 case IP_MINTTL: 1433 case IP_IPDEFTTL: 1434 case IP_PORTRANGE: 1435 case IP_RECVDSTADDR: 1436 case IP_RECVDSTPORT: 1437 return (0); 1438 case IP_MULTICAST_IF: 1439 case IP_MULTICAST_TTL: 1440 case IP_MULTICAST_LOOP: 1441 case IP_ADD_MEMBERSHIP: 1442 case IP_DROP_MEMBERSHIP: 1443 if (p->p_p->ps_pledge & PLEDGE_MCAST) 1444 return (0); 1445 break; 1446 } 1447 break; 1448 case IPPROTO_ICMP: 1449 break; 1450 case IPPROTO_IPV6: 1451 switch (optname) { 1452 case IPV6_TCLASS: 1453 case IPV6_UNICAST_HOPS: 1454 case IPV6_MINHOPCOUNT: 1455 case IPV6_RECVHOPLIMIT: 1456 case IPV6_PORTRANGE: 1457 case IPV6_RECVPKTINFO: 1458 case IPV6_RECVDSTPORT: 1459 case IPV6_V6ONLY: 1460 return (0); 1461 case IPV6_MULTICAST_IF: 1462 case IPV6_MULTICAST_HOPS: 1463 case IPV6_MULTICAST_LOOP: 1464 case IPV6_JOIN_GROUP: 1465 case IPV6_LEAVE_GROUP: 1466 if (p->p_p->ps_pledge & PLEDGE_MCAST) 1467 return (0); 1468 break; 1469 } 1470 break; 1471 case IPPROTO_ICMPV6: 1472 break; 1473 } 1474 return pledge_fail(p, EPERM, PLEDGE_INET); 1475 } 1476 1477 int 1478 pledge_socket(struct proc *p, int domain, unsigned int state) 1479 { 1480 if (! ISSET(p->p_p->ps_flags, PS_PLEDGE)) 1481 return 0; 1482 1483 if (ISSET(state, SS_DNS)) { 1484 if (ISSET(p->p_p->ps_pledge, PLEDGE_DNS)) 1485 return 0; 1486 return pledge_fail(p, EPERM, PLEDGE_DNS); 1487 } 1488 1489 switch (domain) { 1490 case -1: /* accept on any domain */ 1491 return (0); 1492 case AF_INET: 1493 case AF_INET6: 1494 if (ISSET(p->p_p->ps_pledge, PLEDGE_INET) || 1495 ISSET(p->p_p->ps_pledge, PLEDGE_YPACTIVE)) 1496 return 0; 1497 return pledge_fail(p, EPERM, PLEDGE_INET); 1498 1499 case AF_UNIX: 1500 if (ISSET(p->p_p->ps_pledge, PLEDGE_UNIX)) 1501 return 0; 1502 return pledge_fail(p, EPERM, PLEDGE_UNIX); 1503 } 1504 1505 return pledge_fail(p, EINVAL, PLEDGE_INET); 1506 } 1507 1508 int 1509 pledge_flock(struct proc *p) 1510 { 1511 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1512 return (0); 1513 1514 if ((p->p_p->ps_pledge & PLEDGE_FLOCK)) 1515 return (0); 1516 return (pledge_fail(p, EPERM, PLEDGE_FLOCK)); 1517 } 1518 1519 int 1520 pledge_swapctl(struct proc *p) 1521 { 1522 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1523 return (0); 1524 return (EPERM); 1525 } 1526 1527 /* bsearch over pledgereq. return flags value if found, 0 else */ 1528 uint64_t 1529 pledgereq_flags(const char *req_name) 1530 { 1531 int base = 0, cmp, i, lim; 1532 1533 for (lim = nitems(pledgereq); lim != 0; lim >>= 1) { 1534 i = base + (lim >> 1); 1535 cmp = strcmp(req_name, pledgereq[i].name); 1536 if (cmp == 0) 1537 return (pledgereq[i].flags); 1538 if (cmp > 0) { /* not found before, move right */ 1539 base = i + 1; 1540 lim--; 1541 } /* else move left */ 1542 } 1543 return (0); 1544 } 1545 1546 int 1547 pledge_fcntl(struct proc *p, int cmd) 1548 { 1549 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1550 return (0); 1551 if ((p->p_p->ps_pledge & PLEDGE_PROC) == 0 && cmd == F_SETOWN) 1552 return pledge_fail(p, EPERM, PLEDGE_PROC); 1553 return (0); 1554 } 1555 1556 int 1557 pledge_kill(struct proc *p, pid_t pid) 1558 { 1559 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1560 return 0; 1561 if (p->p_p->ps_pledge & PLEDGE_PROC) 1562 return 0; 1563 if (pid == 0 || pid == p->p_p->ps_pid) 1564 return 0; 1565 return pledge_fail(p, EPERM, PLEDGE_PROC); 1566 } 1567 1568 int 1569 pledge_protexec(struct proc *p, int prot) 1570 { 1571 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1572 return 0; 1573 /* Before kbind(2) call, ld.so and crt may create EXEC mappings */ 1574 if (p->p_p->ps_kbind_addr == 0 && p->p_p->ps_kbind_cookie == 0) 1575 return 0; 1576 if (!(p->p_p->ps_pledge & PLEDGE_PROTEXEC) && (prot & PROT_EXEC)) 1577 return pledge_fail(p, EPERM, PLEDGE_PROTEXEC); 1578 return 0; 1579 } 1580 1581 int 1582 canonpath(const char *input, char *buf, size_t bufsize) 1583 { 1584 const char *p; 1585 char *q; 1586 1587 /* can't canon relative paths, don't bother */ 1588 if (input[0] != '/') { 1589 if (strlcpy(buf, input, bufsize) >= bufsize) 1590 return ENAMETOOLONG; 1591 return 0; 1592 } 1593 1594 p = input; 1595 q = buf; 1596 while (*p && (q - buf < bufsize)) { 1597 if (p[0] == '/' && (p[1] == '/' || p[1] == '\0')) { 1598 p += 1; 1599 1600 } else if (p[0] == '/' && p[1] == '.' && 1601 (p[2] == '/' || p[2] == '\0')) { 1602 p += 2; 1603 1604 } else if (p[0] == '/' && p[1] == '.' && p[2] == '.' && 1605 (p[3] == '/' || p[3] == '\0')) { 1606 p += 3; 1607 if (q != buf) /* "/../" at start of buf */ 1608 while (*--q != '/') 1609 continue; 1610 1611 } else { 1612 *q++ = *p++; 1613 } 1614 } 1615 if ((*p == '\0') && (q - buf < bufsize)) { 1616 *q = 0; 1617 return 0; 1618 } else 1619 return ENAMETOOLONG; 1620 } 1621