1 /* $OpenBSD: kern_pledge.c,v 1.272 2021/04/30 02:06:22 deraadt Exp $ */ 2 3 /* 4 * Copyright (c) 2015 Nicholas Marriott <nicm@openbsd.org> 5 * Copyright (c) 2015 Theo de Raadt <deraadt@openbsd.org> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 #include <sys/param.h> 21 22 #include <sys/mount.h> 23 #include <sys/proc.h> 24 #include <sys/fcntl.h> 25 #include <sys/file.h> 26 #include <sys/filedesc.h> 27 #include <sys/namei.h> 28 #include <sys/pool.h> 29 #include <sys/socketvar.h> 30 #include <sys/vnode.h> 31 #include <sys/mbuf.h> 32 #include <sys/mman.h> 33 #include <sys/sysctl.h> 34 #include <sys/syslog.h> 35 #include <sys/ktrace.h> 36 #include <sys/acct.h> 37 38 #include <sys/ioctl.h> 39 #include <sys/termios.h> 40 #include <sys/tty.h> 41 #include <sys/device.h> 42 #include <sys/disklabel.h> 43 #include <sys/dkio.h> 44 #include <sys/mtio.h> 45 #include <sys/audioio.h> 46 #include <sys/videoio.h> 47 #include <net/bpf.h> 48 #include <net/route.h> 49 #include <net/if.h> 50 #include <net/if_var.h> 51 #include <netinet/in.h> 52 #include <netinet6/in6_var.h> 53 #include <netinet6/nd6.h> 54 #include <netinet/tcp.h> 55 #include <net/pfvar.h> 56 57 #include <sys/conf.h> 58 #include <sys/specdev.h> 59 #include <sys/signal.h> 60 #include <sys/signalvar.h> 61 #include <sys/syscall.h> 62 #include <sys/syscallargs.h> 63 #include <sys/systm.h> 64 65 #include <dev/biovar.h> 66 67 #define PLEDGENAMES 68 #include <sys/pledge.h> 69 70 #include "audio.h" 71 #include "bpfilter.h" 72 #include "pf.h" 73 #include "video.h" 74 #include "pty.h" 75 76 #if defined(__amd64__) 77 #include "vmm.h" 78 #if NVMM > 0 79 #include <machine/conf.h> 80 #endif 81 #endif 82 83 #if defined(__amd64__) || defined(__arm64__) || \ 84 defined(__i386__) || defined(__loongson__) || \ 85 defined(__macppc__) || defined(__sparc64__) 86 #include "drm.h" 87 #endif 88 89 uint64_t pledgereq_flags(const char *req); 90 int parsepledges(struct proc *p, const char *kname, 91 const char *promises, u_int64_t *fp); 92 int canonpath(const char *input, char *buf, size_t bufsize); 93 void unveil_destroy(struct process *ps); 94 95 /* #define DEBUG_PLEDGE */ 96 #ifdef DEBUG_PLEDGE 97 int debug_pledge = 1; 98 #define DPRINTF(x...) do { if (debug_pledge) printf(x); } while (0) 99 #define DNPRINTF(n,x...) do { if (debug_pledge >= (n)) printf(x); } while (0) 100 #else 101 #define DPRINTF(x...) 102 #define DNPRINTF(n,x...) 103 #endif 104 105 /* 106 * Ordered in blocks starting with least risky and most required. 107 */ 108 const uint64_t pledge_syscalls[SYS_MAXSYSCALL] = { 109 /* 110 * Minimum required 111 */ 112 [SYS_exit] = PLEDGE_ALWAYS, 113 [SYS_kbind] = PLEDGE_ALWAYS, 114 [SYS_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 /* Stop threads immediately, because this process is suspect */ 552 if (P_HASSIBLING(p)) 553 single_thread_set(p, SINGLE_SUSPEND, 1); 554 555 /* Send uncatchable SIGABRT for coredump */ 556 sigabort(p); 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,protocols}. */ 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 if (strcmp(path, "/etc/protocols") == 0) { 685 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 686 return (0); 687 } 688 } 689 690 if ((ni->ni_pledge == PLEDGE_RPATH) && 691 (p->p_p->ps_pledge & PLEDGE_GETPW)) { 692 if (strcmp(path, "/var/run/ypbind.lock") == 0) { 693 /* 694 * XXX 695 * The current hack for YP support in "getpw" 696 * is to enable some "inet" features until 697 * next pledge call. This is not considered 698 * worse than pre-pledge, but is a work in 699 * progress, needing a clever design. 700 */ 701 p->p_p->ps_pledge |= PLEDGE_YPACTIVE; 702 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 703 return (0); 704 } 705 if (strncmp(path, "/var/yp/binding/", 706 sizeof("/var/yp/binding/") - 1) == 0) { 707 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 708 return (0); 709 } 710 } 711 712 /* tzset() needs these. */ 713 if ((ni->ni_pledge == PLEDGE_RPATH) && 714 strncmp(path, "/usr/share/zoneinfo/", 715 sizeof("/usr/share/zoneinfo/") - 1) == 0) { 716 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 717 return (0); 718 } 719 if ((ni->ni_pledge == PLEDGE_RPATH) && 720 strcmp(path, "/etc/localtime") == 0) { 721 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 722 return (0); 723 } 724 725 break; 726 case SYS_stat: 727 /* DNS needs /etc/resolv.conf. */ 728 if ((ni->ni_pledge == PLEDGE_RPATH) && 729 (p->p_p->ps_pledge & PLEDGE_DNS) && 730 strcmp(path, "/etc/resolv.conf") == 0) { 731 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 732 return (0); 733 } 734 break; 735 } 736 737 /* 738 * Ensure each flag of ni_pledge has counterpart allowing it in 739 * ps_pledge. 740 */ 741 if (ni->ni_pledge & ~p->p_p->ps_pledge) 742 return (pledge_fail(p, EPERM, (ni->ni_pledge & ~p->p_p->ps_pledge))); 743 744 /* continue, and check unveil if present */ 745 return (0); 746 } 747 748 /* 749 * Only allow reception of safe file descriptors. 750 */ 751 int 752 pledge_recvfd(struct proc *p, struct file *fp) 753 { 754 struct vnode *vp; 755 756 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 757 return (0); 758 if ((p->p_p->ps_pledge & PLEDGE_RECVFD) == 0) 759 return pledge_fail(p, EPERM, PLEDGE_RECVFD); 760 761 switch (fp->f_type) { 762 case DTYPE_SOCKET: 763 case DTYPE_PIPE: 764 case DTYPE_DMABUF: 765 return (0); 766 case DTYPE_VNODE: 767 vp = fp->f_data; 768 769 if (vp->v_type != VDIR) 770 return (0); 771 } 772 return pledge_fail(p, EINVAL, PLEDGE_RECVFD); 773 } 774 775 /* 776 * Only allow sending of safe file descriptors. 777 */ 778 int 779 pledge_sendfd(struct proc *p, struct file *fp) 780 { 781 struct vnode *vp; 782 783 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 784 return (0); 785 if ((p->p_p->ps_pledge & PLEDGE_SENDFD) == 0) 786 return pledge_fail(p, EPERM, PLEDGE_SENDFD); 787 788 switch (fp->f_type) { 789 case DTYPE_SOCKET: 790 case DTYPE_PIPE: 791 case DTYPE_DMABUF: 792 return (0); 793 case DTYPE_VNODE: 794 vp = fp->f_data; 795 796 if (vp->v_type != VDIR) 797 return (0); 798 break; 799 } 800 return pledge_fail(p, EINVAL, PLEDGE_SENDFD); 801 } 802 803 int 804 pledge_sysctl(struct proc *p, int miblen, int *mib, void *new) 805 { 806 char buf[80]; 807 int i; 808 809 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 810 return (0); 811 812 if (new) 813 return pledge_fail(p, EFAULT, 0); 814 815 /* routing table observation */ 816 if ((p->p_p->ps_pledge & PLEDGE_ROUTE)) { 817 if ((miblen == 6 || miblen == 7) && 818 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 819 mib[2] == 0 && 820 mib[4] == NET_RT_DUMP) 821 return (0); 822 823 if (miblen == 6 && 824 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 825 mib[2] == 0 && 826 (mib[3] == 0 || mib[3] == AF_INET6 || mib[3] == AF_INET) && 827 (mib[4] == NET_RT_TABLE || mib[4] == NET_RT_SOURCE)) 828 return (0); 829 830 if (miblen == 7 && /* exposes MACs */ 831 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 832 mib[2] == 0 && 833 (mib[3] == 0 || mib[3] == AF_INET6 || mib[3] == AF_INET) && 834 mib[4] == NET_RT_FLAGS && mib[5] == RTF_LLINFO) 835 return (0); 836 } 837 838 if ((p->p_p->ps_pledge & PLEDGE_WROUTE)) { 839 if (miblen == 4 && 840 mib[0] == CTL_NET && mib[1] == PF_INET6 && 841 mib[2] == IPPROTO_IPV6 && mib[3] == IPV6CTL_SOIIKEY) 842 return (0); 843 } 844 845 if (p->p_p->ps_pledge & (PLEDGE_PS | PLEDGE_VMINFO)) { 846 if (miblen == 2 && /* kern.fscale */ 847 mib[0] == CTL_KERN && mib[1] == KERN_FSCALE) 848 return (0); 849 if (miblen == 2 && /* kern.boottime */ 850 mib[0] == CTL_KERN && mib[1] == KERN_BOOTTIME) 851 return (0); 852 if (miblen == 2 && /* kern.consdev */ 853 mib[0] == CTL_KERN && mib[1] == KERN_CONSDEV) 854 return (0); 855 if (miblen == 2 && /* kern.cptime */ 856 mib[0] == CTL_KERN && mib[1] == KERN_CPTIME) 857 return (0); 858 if (miblen == 3 && /* kern.cptime2 */ 859 mib[0] == CTL_KERN && mib[1] == KERN_CPTIME2) 860 return (0); 861 if (miblen == 3 && /* kern.cpustats */ 862 mib[0] == CTL_KERN && mib[1] == KERN_CPUSTATS) 863 return (0); 864 } 865 866 if ((p->p_p->ps_pledge & PLEDGE_PS)) { 867 if (miblen == 4 && /* kern.procargs.* */ 868 mib[0] == CTL_KERN && mib[1] == KERN_PROC_ARGS && 869 (mib[3] == KERN_PROC_ARGV || mib[3] == KERN_PROC_ENV)) 870 return (0); 871 if (miblen == 6 && /* kern.proc.* */ 872 mib[0] == CTL_KERN && mib[1] == KERN_PROC) 873 return (0); 874 if (miblen == 3 && /* kern.proc_cwd.* */ 875 mib[0] == CTL_KERN && mib[1] == KERN_PROC_CWD) 876 return (0); 877 if (miblen == 2 && /* kern.ccpu */ 878 mib[0] == CTL_KERN && mib[1] == KERN_CCPU) 879 return (0); 880 if (miblen == 2 && /* vm.maxslp */ 881 mib[0] == CTL_VM && mib[1] == VM_MAXSLP) 882 return (0); 883 } 884 885 if ((p->p_p->ps_pledge & PLEDGE_VMINFO)) { 886 if (miblen == 2 && /* vm.uvmexp */ 887 mib[0] == CTL_VM && mib[1] == VM_UVMEXP) 888 return (0); 889 if (miblen == 3 && /* vfs.generic.bcachestat */ 890 mib[0] == CTL_VFS && mib[1] == VFS_GENERIC && 891 mib[2] == VFS_BCACHESTAT) 892 return (0); 893 } 894 895 if ((p->p_p->ps_pledge & (PLEDGE_INET | PLEDGE_UNIX))) { 896 if (miblen == 2 && /* kern.somaxconn */ 897 mib[0] == CTL_KERN && mib[1] == KERN_SOMAXCONN) 898 return (0); 899 } 900 901 if ((p->p_p->ps_pledge & (PLEDGE_ROUTE | PLEDGE_INET | PLEDGE_DNS))) { 902 if (miblen == 6 && /* getifaddrs() */ 903 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 904 mib[2] == 0 && 905 (mib[3] == 0 || mib[3] == AF_INET6 || mib[3] == AF_INET) && 906 mib[4] == NET_RT_IFLIST) 907 return (0); 908 } 909 910 if ((p->p_p->ps_pledge & PLEDGE_DISKLABEL)) { 911 if (miblen == 2 && /* kern.rawpartition */ 912 mib[0] == CTL_KERN && 913 mib[1] == KERN_RAWPARTITION) 914 return (0); 915 if (miblen == 2 && /* kern.maxpartitions */ 916 mib[0] == CTL_KERN && 917 mib[1] == KERN_MAXPARTITIONS) 918 return (0); 919 #ifdef CPU_CHR2BLK 920 if (miblen == 3 && /* machdep.chr2blk */ 921 mib[0] == CTL_MACHDEP && 922 mib[1] == CPU_CHR2BLK) 923 return (0); 924 #endif /* CPU_CHR2BLK */ 925 } 926 927 if (miblen >= 3 && /* ntpd(8) to read sensors */ 928 mib[0] == CTL_HW && mib[1] == HW_SENSORS) 929 return (0); 930 931 if (miblen == 6 && /* if_nameindex() */ 932 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 933 mib[2] == 0 && mib[3] == 0 && mib[4] == NET_RT_IFNAMES) 934 return (0); 935 936 if (miblen == 2) { 937 switch (mib[0]) { 938 case CTL_KERN: 939 switch (mib[1]) { 940 case KERN_DOMAINNAME: /* getdomainname() */ 941 case KERN_HOSTNAME: /* gethostname() */ 942 case KERN_OSTYPE: /* uname() */ 943 case KERN_OSRELEASE: /* uname() */ 944 case KERN_OSVERSION: /* uname() */ 945 case KERN_VERSION: /* uname() */ 946 case KERN_CLOCKRATE: /* kern.clockrate */ 947 case KERN_ARGMAX: /* kern.argmax */ 948 case KERN_NGROUPS: /* kern.ngroups */ 949 case KERN_SYSVSHM: /* kern.sysvshm */ 950 case KERN_POSIX1: /* kern.posix1version */ 951 return (0); 952 } 953 break; 954 case CTL_HW: 955 switch (mib[1]) { 956 case HW_MACHINE: /* uname() */ 957 case HW_PAGESIZE: /* getpagesize() */ 958 case HW_PHYSMEM64: /* hw.physmem */ 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 uint64_t pl = p->p_p->ps_pledge; 1044 1045 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1046 return (0); 1047 1048 /* 1049 * The ioctl's which are always allowed. 1050 */ 1051 switch (com) { 1052 case FIONREAD: 1053 case FIONBIO: 1054 case FIOCLEX: 1055 case FIONCLEX: 1056 return (0); 1057 } 1058 1059 /* fp != NULL was already checked */ 1060 if (fp->f_type == DTYPE_VNODE) { 1061 vp = fp->f_data; 1062 if (vp->v_type == VBAD) 1063 return (ENOTTY); 1064 } 1065 1066 if ((pl & PLEDGE_INET)) { 1067 switch (com) { 1068 case SIOCATMARK: 1069 case SIOCGIFGROUP: 1070 if (fp->f_type == DTYPE_SOCKET) 1071 return (0); 1072 break; 1073 } 1074 } 1075 1076 #if NBPFILTER > 0 1077 if ((pl & PLEDGE_BPF)) { 1078 switch (com) { 1079 case BIOCGSTATS: /* bpf: tcpdump privsep on ^C */ 1080 if (fp->f_type == DTYPE_VNODE && 1081 fp->f_ops->fo_ioctl == vn_ioctl && 1082 vp->v_type == VCHR && 1083 cdevsw[major(vp->v_rdev)].d_open == bpfopen) 1084 return (0); 1085 break; 1086 } 1087 } 1088 #endif /* NBPFILTER > 0 */ 1089 1090 if ((pl & PLEDGE_TAPE)) { 1091 switch (com) { 1092 case MTIOCGET: 1093 case MTIOCTOP: 1094 /* for pax(1) and such, checking tapes... */ 1095 if (fp->f_type == DTYPE_VNODE && 1096 vp->v_type == VCHR) { 1097 if (vp->v_flag & VISTTY) 1098 return (ENOTTY); 1099 else 1100 return (0); 1101 } 1102 break; 1103 } 1104 } 1105 1106 #if NDRM > 0 1107 if ((pl & PLEDGE_DRM)) { 1108 if ((fp->f_type == DTYPE_VNODE) && 1109 (vp->v_type == VCHR) && 1110 (cdevsw[major(vp->v_rdev)].d_open == drmopen)) { 1111 error = pledge_ioctl_drm(p, com, vp->v_rdev); 1112 if (error == 0) 1113 return 0; 1114 } 1115 } 1116 #endif /* NDRM > 0 */ 1117 1118 #if NAUDIO > 0 1119 if ((pl & PLEDGE_AUDIO)) { 1120 switch (com) { 1121 case AUDIO_GETPOS: 1122 case AUDIO_GETPAR: 1123 case AUDIO_SETPAR: 1124 case AUDIO_START: 1125 case AUDIO_STOP: 1126 case AUDIO_MIXER_DEVINFO: 1127 case AUDIO_MIXER_READ: 1128 case AUDIO_MIXER_WRITE: 1129 if (fp->f_type == DTYPE_VNODE && 1130 vp->v_type == VCHR && 1131 cdevsw[major(vp->v_rdev)].d_open == audioopen) 1132 return (0); 1133 } 1134 } 1135 #endif /* NAUDIO > 0 */ 1136 1137 if ((pl & PLEDGE_DISKLABEL)) { 1138 switch (com) { 1139 case DIOCGDINFO: 1140 case DIOCGPDINFO: 1141 case DIOCRLDINFO: 1142 case DIOCWDINFO: 1143 case BIOCDISK: 1144 case BIOCINQ: 1145 case BIOCINSTALLBOOT: 1146 case BIOCVOL: 1147 if (fp->f_type == DTYPE_VNODE && 1148 ((vp->v_type == VCHR && 1149 cdevsw[major(vp->v_rdev)].d_type == D_DISK) || 1150 (vp->v_type == VBLK && 1151 bdevsw[major(vp->v_rdev)].d_type == D_DISK))) 1152 return (0); 1153 break; 1154 case DIOCMAP: 1155 if (fp->f_type == DTYPE_VNODE && 1156 vp->v_type == VCHR && 1157 cdevsw[major(vp->v_rdev)].d_ioctl == diskmapioctl) 1158 return (0); 1159 break; 1160 } 1161 } 1162 1163 #if NVIDEO > 0 1164 if ((pl & PLEDGE_VIDEO)) { 1165 switch (com) { 1166 case VIDIOC_QUERYCAP: 1167 case VIDIOC_TRY_FMT: 1168 case VIDIOC_ENUM_FMT: 1169 case VIDIOC_S_FMT: 1170 case VIDIOC_QUERYCTRL: 1171 case VIDIOC_G_CTRL: 1172 case VIDIOC_S_CTRL: 1173 case VIDIOC_G_PARM: 1174 case VIDIOC_S_PARM: 1175 case VIDIOC_REQBUFS: 1176 case VIDIOC_QBUF: 1177 case VIDIOC_DQBUF: 1178 case VIDIOC_QUERYBUF: 1179 case VIDIOC_STREAMON: 1180 case VIDIOC_STREAMOFF: 1181 case VIDIOC_ENUM_FRAMESIZES: 1182 case VIDIOC_ENUM_FRAMEINTERVALS: 1183 case VIDIOC_DQEVENT: 1184 case VIDIOC_ENCODER_CMD: 1185 case VIDIOC_EXPBUF: 1186 case VIDIOC_G_CROP: 1187 case VIDIOC_G_EXT_CTRLS: 1188 case VIDIOC_G_FMT: 1189 case VIDIOC_G_SELECTION: 1190 case VIDIOC_QUERYMENU: 1191 case VIDIOC_SUBSCRIBE_EVENT: 1192 case VIDIOC_S_EXT_CTRLS: 1193 case VIDIOC_S_SELECTION: 1194 case VIDIOC_TRY_DECODER_CMD: 1195 case VIDIOC_TRY_ENCODER_CMD: 1196 if (fp->f_type == DTYPE_VNODE && 1197 vp->v_type == VCHR && 1198 cdevsw[major(vp->v_rdev)].d_open == videoopen) 1199 return (0); 1200 break; 1201 } 1202 } 1203 #endif 1204 1205 #if NPF > 0 1206 if ((pl & PLEDGE_PF)) { 1207 switch (com) { 1208 case DIOCADDRULE: 1209 case DIOCGETSTATUS: 1210 case DIOCNATLOOK: 1211 case DIOCRADDTABLES: 1212 case DIOCRCLRADDRS: 1213 case DIOCRCLRTABLES: 1214 case DIOCRCLRTSTATS: 1215 case DIOCRGETTSTATS: 1216 case DIOCRSETADDRS: 1217 case DIOCXBEGIN: 1218 case DIOCXCOMMIT: 1219 case DIOCKILLSRCNODES: 1220 if ((fp->f_type == DTYPE_VNODE) && 1221 (vp->v_type == VCHR) && 1222 (cdevsw[major(vp->v_rdev)].d_open == pfopen)) 1223 return (0); 1224 break; 1225 } 1226 } 1227 #endif 1228 1229 if ((pl & PLEDGE_TTY)) { 1230 switch (com) { 1231 #if NPTY > 0 1232 case PTMGET: 1233 if ((pl & PLEDGE_RPATH) == 0) 1234 break; 1235 if ((pl & PLEDGE_WPATH) == 0) 1236 break; 1237 if (fp->f_type != DTYPE_VNODE || vp->v_type != VCHR) 1238 break; 1239 if (cdevsw[major(vp->v_rdev)].d_open != ptmopen) 1240 break; 1241 return (0); 1242 case TIOCUCNTL: /* vmd */ 1243 if ((pl & PLEDGE_RPATH) == 0) 1244 break; 1245 if ((pl & PLEDGE_WPATH) == 0) 1246 break; 1247 if (cdevsw[major(vp->v_rdev)].d_open != ptcopen) 1248 break; 1249 return (0); 1250 #endif /* NPTY > 0 */ 1251 case TIOCSPGRP: 1252 if ((pl & PLEDGE_PROC) == 0) 1253 break; 1254 /* FALLTHROUGH */ 1255 case TIOCFLUSH: /* getty, telnet */ 1256 case TIOCSTART: /* emacs, etc */ 1257 case TIOCGPGRP: 1258 case TIOCGETA: 1259 case TIOCGWINSZ: /* ENOTTY return for non-tty */ 1260 case TIOCSTAT: /* csh */ 1261 if (fp->f_type == DTYPE_VNODE && (vp->v_flag & VISTTY)) 1262 return (0); 1263 return (ENOTTY); 1264 case TIOCSWINSZ: 1265 case TIOCEXT: /* mail, libedit .. */ 1266 case TIOCCBRK: /* cu */ 1267 case TIOCSBRK: /* cu */ 1268 case TIOCCDTR: /* cu */ 1269 case TIOCSDTR: /* cu */ 1270 case TIOCEXCL: /* cu */ 1271 case TIOCSETA: /* cu, ... */ 1272 case TIOCSETAW: /* cu, ... */ 1273 case TIOCSETAF: /* tcsetattr TCSAFLUSH, script */ 1274 case TIOCSCTTY: /* forkpty(3), login_tty(3), ... */ 1275 if (fp->f_type == DTYPE_VNODE && (vp->v_flag & VISTTY)) 1276 return (0); 1277 break; 1278 } 1279 } 1280 1281 if ((pl & PLEDGE_ROUTE)) { 1282 switch (com) { 1283 case SIOCGIFADDR: 1284 case SIOCGIFAFLAG_IN6: 1285 case SIOCGIFALIFETIME_IN6: 1286 case SIOCGIFDESCR: 1287 case SIOCGIFFLAGS: 1288 case SIOCGIFMETRIC: 1289 case SIOCGIFGMEMB: 1290 case SIOCGIFRDOMAIN: 1291 case SIOCGIFDSTADDR_IN6: 1292 case SIOCGIFNETMASK_IN6: 1293 case SIOCGIFXFLAGS: 1294 case SIOCGNBRINFO_IN6: 1295 case SIOCGIFINFO_IN6: 1296 case SIOCGIFMEDIA: 1297 if (fp->f_type == DTYPE_SOCKET) 1298 return (0); 1299 break; 1300 } 1301 } 1302 1303 if ((pl & PLEDGE_WROUTE)) { 1304 switch (com) { 1305 case SIOCAIFADDR: 1306 case SIOCDIFADDR: 1307 case SIOCAIFADDR_IN6: 1308 case SIOCDIFADDR_IN6: 1309 if (fp->f_type == DTYPE_SOCKET) 1310 return (0); 1311 break; 1312 case SIOCSIFMTU: 1313 if (fp->f_type == DTYPE_SOCKET) 1314 return (0); 1315 break; 1316 } 1317 } 1318 1319 #if NVMM > 0 1320 if ((pl & PLEDGE_VMM)) { 1321 if ((fp->f_type == DTYPE_VNODE) && 1322 (vp->v_type == VCHR) && 1323 (cdevsw[major(vp->v_rdev)].d_open == vmmopen)) { 1324 error = pledge_ioctl_vmm(p, com); 1325 if (error == 0) 1326 return 0; 1327 } 1328 } 1329 #endif 1330 1331 return pledge_fail(p, error, PLEDGE_TTY); 1332 } 1333 1334 int 1335 pledge_sockopt(struct proc *p, int set, int level, int optname) 1336 { 1337 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1338 return (0); 1339 1340 /* Always allow these, which are too common to reject */ 1341 switch (level) { 1342 case SOL_SOCKET: 1343 switch (optname) { 1344 case SO_RCVBUF: 1345 case SO_ERROR: 1346 return 0; 1347 } 1348 break; 1349 } 1350 1351 if ((p->p_p->ps_pledge & PLEDGE_WROUTE)) { 1352 switch (level) { 1353 case SOL_SOCKET: 1354 switch (optname) { 1355 case SO_RTABLE: 1356 return (0); 1357 } 1358 } 1359 } 1360 1361 if ((p->p_p->ps_pledge & (PLEDGE_INET|PLEDGE_UNIX|PLEDGE_DNS|PLEDGE_YPACTIVE)) == 0) 1362 return pledge_fail(p, EPERM, PLEDGE_INET); 1363 /* In use by some service libraries */ 1364 switch (level) { 1365 case SOL_SOCKET: 1366 switch (optname) { 1367 case SO_TIMESTAMP: 1368 return 0; 1369 } 1370 break; 1371 } 1372 1373 /* DNS resolver may do these requests */ 1374 if ((p->p_p->ps_pledge & PLEDGE_DNS)) { 1375 switch (level) { 1376 case IPPROTO_IPV6: 1377 switch (optname) { 1378 case IPV6_RECVPKTINFO: 1379 case IPV6_USE_MIN_MTU: 1380 return (0); 1381 } 1382 } 1383 } 1384 1385 /* YP may do these requests */ 1386 if (p->p_p->ps_pledge & PLEDGE_YPACTIVE) { 1387 switch (level) { 1388 case IPPROTO_IP: 1389 switch (optname) { 1390 case IP_PORTRANGE: 1391 return (0); 1392 } 1393 break; 1394 1395 case IPPROTO_IPV6: 1396 switch (optname) { 1397 case IPV6_PORTRANGE: 1398 return (0); 1399 } 1400 break; 1401 } 1402 } 1403 1404 if ((p->p_p->ps_pledge & (PLEDGE_INET|PLEDGE_UNIX)) == 0) 1405 return pledge_fail(p, EPERM, PLEDGE_INET); 1406 switch (level) { 1407 case SOL_SOCKET: 1408 switch (optname) { 1409 case SO_RTABLE: 1410 return pledge_fail(p, EINVAL, PLEDGE_WROUTE); 1411 } 1412 return (0); 1413 } 1414 1415 if ((p->p_p->ps_pledge & PLEDGE_INET) == 0) 1416 return pledge_fail(p, EPERM, PLEDGE_INET); 1417 switch (level) { 1418 case IPPROTO_TCP: 1419 switch (optname) { 1420 case TCP_NODELAY: 1421 case TCP_MD5SIG: 1422 case TCP_SACK_ENABLE: 1423 case TCP_MAXSEG: 1424 case TCP_NOPUSH: 1425 return (0); 1426 } 1427 break; 1428 case IPPROTO_IP: 1429 switch (optname) { 1430 case IP_OPTIONS: 1431 if (!set) 1432 return (0); 1433 break; 1434 case IP_TOS: 1435 case IP_TTL: 1436 case IP_MINTTL: 1437 case IP_IPDEFTTL: 1438 case IP_PORTRANGE: 1439 case IP_RECVDSTADDR: 1440 case IP_RECVDSTPORT: 1441 return (0); 1442 case IP_MULTICAST_IF: 1443 case IP_MULTICAST_TTL: 1444 case IP_MULTICAST_LOOP: 1445 case IP_ADD_MEMBERSHIP: 1446 case IP_DROP_MEMBERSHIP: 1447 if (p->p_p->ps_pledge & PLEDGE_MCAST) 1448 return (0); 1449 break; 1450 } 1451 break; 1452 case IPPROTO_ICMP: 1453 break; 1454 case IPPROTO_IPV6: 1455 switch (optname) { 1456 case IPV6_TCLASS: 1457 case IPV6_UNICAST_HOPS: 1458 case IPV6_MINHOPCOUNT: 1459 case IPV6_RECVHOPLIMIT: 1460 case IPV6_PORTRANGE: 1461 case IPV6_RECVPKTINFO: 1462 case IPV6_RECVDSTPORT: 1463 case IPV6_V6ONLY: 1464 return (0); 1465 case IPV6_MULTICAST_IF: 1466 case IPV6_MULTICAST_HOPS: 1467 case IPV6_MULTICAST_LOOP: 1468 case IPV6_JOIN_GROUP: 1469 case IPV6_LEAVE_GROUP: 1470 if (p->p_p->ps_pledge & PLEDGE_MCAST) 1471 return (0); 1472 break; 1473 } 1474 break; 1475 case IPPROTO_ICMPV6: 1476 break; 1477 } 1478 return pledge_fail(p, EPERM, PLEDGE_INET); 1479 } 1480 1481 int 1482 pledge_socket(struct proc *p, int domain, unsigned int state) 1483 { 1484 if (! ISSET(p->p_p->ps_flags, PS_PLEDGE)) 1485 return 0; 1486 1487 if (ISSET(state, SS_DNS)) { 1488 if (ISSET(p->p_p->ps_pledge, PLEDGE_DNS)) 1489 return 0; 1490 return pledge_fail(p, EPERM, PLEDGE_DNS); 1491 } 1492 1493 switch (domain) { 1494 case -1: /* accept on any domain */ 1495 return (0); 1496 case AF_INET: 1497 case AF_INET6: 1498 if (ISSET(p->p_p->ps_pledge, PLEDGE_INET) || 1499 ISSET(p->p_p->ps_pledge, PLEDGE_YPACTIVE)) 1500 return 0; 1501 return pledge_fail(p, EPERM, PLEDGE_INET); 1502 1503 case AF_UNIX: 1504 if (ISSET(p->p_p->ps_pledge, PLEDGE_UNIX)) 1505 return 0; 1506 return pledge_fail(p, EPERM, PLEDGE_UNIX); 1507 } 1508 1509 return pledge_fail(p, EINVAL, PLEDGE_INET); 1510 } 1511 1512 int 1513 pledge_flock(struct proc *p) 1514 { 1515 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1516 return (0); 1517 1518 if ((p->p_p->ps_pledge & PLEDGE_FLOCK)) 1519 return (0); 1520 return (pledge_fail(p, EPERM, PLEDGE_FLOCK)); 1521 } 1522 1523 int 1524 pledge_swapctl(struct proc *p) 1525 { 1526 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1527 return (0); 1528 return (EPERM); 1529 } 1530 1531 /* bsearch over pledgereq. return flags value if found, 0 else */ 1532 uint64_t 1533 pledgereq_flags(const char *req_name) 1534 { 1535 int base = 0, cmp, i, lim; 1536 1537 for (lim = nitems(pledgereq); lim != 0; lim >>= 1) { 1538 i = base + (lim >> 1); 1539 cmp = strcmp(req_name, pledgereq[i].name); 1540 if (cmp == 0) 1541 return (pledgereq[i].flags); 1542 if (cmp > 0) { /* not found before, move right */ 1543 base = i + 1; 1544 lim--; 1545 } /* else move left */ 1546 } 1547 return (0); 1548 } 1549 1550 int 1551 pledge_fcntl(struct proc *p, int cmd) 1552 { 1553 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1554 return (0); 1555 if ((p->p_p->ps_pledge & PLEDGE_PROC) == 0 && cmd == F_SETOWN) 1556 return pledge_fail(p, EPERM, PLEDGE_PROC); 1557 return (0); 1558 } 1559 1560 int 1561 pledge_kill(struct proc *p, pid_t pid) 1562 { 1563 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1564 return 0; 1565 if (p->p_p->ps_pledge & PLEDGE_PROC) 1566 return 0; 1567 if (pid == 0 || pid == p->p_p->ps_pid) 1568 return 0; 1569 return pledge_fail(p, EPERM, PLEDGE_PROC); 1570 } 1571 1572 int 1573 pledge_protexec(struct proc *p, int prot) 1574 { 1575 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1576 return 0; 1577 /* Before kbind(2) call, ld.so and crt may create EXEC mappings */ 1578 if (p->p_p->ps_kbind_addr == 0 && p->p_p->ps_kbind_cookie == 0) 1579 return 0; 1580 if (!(p->p_p->ps_pledge & PLEDGE_PROTEXEC) && (prot & PROT_EXEC)) 1581 return pledge_fail(p, EPERM, PLEDGE_PROTEXEC); 1582 return 0; 1583 } 1584 1585 int 1586 canonpath(const char *input, char *buf, size_t bufsize) 1587 { 1588 const char *p; 1589 char *q; 1590 1591 /* can't canon relative paths, don't bother */ 1592 if (input[0] != '/') { 1593 if (strlcpy(buf, input, bufsize) >= bufsize) 1594 return ENAMETOOLONG; 1595 return 0; 1596 } 1597 1598 p = input; 1599 q = buf; 1600 while (*p && (q - buf < bufsize)) { 1601 if (p[0] == '/' && (p[1] == '/' || p[1] == '\0')) { 1602 p += 1; 1603 1604 } else if (p[0] == '/' && p[1] == '.' && 1605 (p[2] == '/' || p[2] == '\0')) { 1606 p += 2; 1607 1608 } else if (p[0] == '/' && p[1] == '.' && p[2] == '.' && 1609 (p[3] == '/' || p[3] == '\0')) { 1610 p += 3; 1611 if (q != buf) /* "/../" at start of buf */ 1612 while (*--q != '/') 1613 continue; 1614 1615 } else { 1616 *q++ = *p++; 1617 } 1618 } 1619 if ((*p == '\0') && (q - buf < bufsize)) { 1620 *q = 0; 1621 return 0; 1622 } else 1623 return ENAMETOOLONG; 1624 } 1625