1/* $OpenBSD: kern_pledge.c,v 1.316 2024/06/03 03:41:47 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#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/namei.h> 27#include <sys/socketvar.h> 28#include <sys/vnode.h> 29#include <sys/mman.h> 30#include <sys/sysctl.h> 31#include <sys/syslog.h> 32#include <sys/ktrace.h> 33#include <sys/acct.h> 34#include <sys/swap.h> 35 36#include <sys/ioctl.h> 37#include <sys/termios.h> 38#include <sys/tty.h> 39#include <sys/device.h> 40#include <sys/disklabel.h> 41#include <sys/dkio.h> 42#include <sys/mtio.h> 43#include <sys/audioio.h> 44#include <sys/videoio.h> 45#include <net/bpf.h> 46#include <net/route.h> 47#include <net/if.h> 48#include <net/if_var.h> 49#include <netinet/in.h> 50#include <netinet6/in6_var.h> 51#include <netinet6/nd6.h> 52#include <netinet/tcp.h> 53#include <net/pfvar.h> 54 55#include <sys/conf.h> 56#include <sys/specdev.h> 57#include <sys/signal.h> 58#include <sys/signalvar.h> 59#include <sys/syscall.h> 60#include <sys/syscallargs.h> 61#include <sys/systm.h> 62 63#include <dev/biovar.h> 64 65#define PLEDGENAMES 66#include <sys/pledge.h> 67 68#include "audio.h" 69#include "bpfilter.h" 70#include "pf.h" 71#include "video.h" 72#include "pty.h" 73 74#if defined(__amd64__) 75#include "vmm.h" 76#if NVMM > 0 77#include <machine/conf.h> 78#endif 79#endif 80 81#include "drm.h" 82 83uint64_t pledgereq_flags(const char *req); 84int parsepledges(struct proc *p, const char *kname, 85 const char *promises, u_int64_t *fp); 86int canonpath(const char *input, char *buf, size_t bufsize); 87void unveil_destroy(struct process *ps); 88 89/* #define DEBUG_PLEDGE */ 90#ifdef DEBUG_PLEDGE 91int debug_pledge = 1; 92#define DPRINTF(x...) do { if (debug_pledge) printf(x); } while (0) 93#define DNPRINTF(n,x...) do { if (debug_pledge >= (n)) printf(x); } while (0) 94#else 95#define DPRINTF(x...) 96#define DNPRINTF(n,x...) 97#endif 98 99/* 100 * Ordered in blocks starting with least risky and most required. 101 */ 102const uint64_t pledge_syscalls[SYS_MAXSYSCALL] = { 103 /* 104 * Minimum required 105 */ 106 [SYS_exit] = PLEDGE_ALWAYS, 107 [SYS_kbind] = PLEDGE_ALWAYS, 108 [SYS___get_tcb] = PLEDGE_ALWAYS, 109 [SYS___set_tcb] = PLEDGE_ALWAYS, 110 [SYS_pledge] = PLEDGE_ALWAYS, 111 [SYS_sendsyslog] = PLEDGE_ALWAYS, /* stack protector reporting */ 112 [SYS_thrkill] = PLEDGE_ALWAYS, /* raise, abort, stack pro */ 113 [SYS_utrace] = PLEDGE_ALWAYS, /* ltrace(1) from ld.so */ 114 [SYS_pinsyscalls] = PLEDGE_ALWAYS, 115 116 /* "getting" information about self is considered safe */ 117 [SYS_getuid] = PLEDGE_STDIO, 118 [SYS_geteuid] = PLEDGE_STDIO, 119 [SYS_getresuid] = PLEDGE_STDIO, 120 [SYS_getgid] = PLEDGE_STDIO, 121 [SYS_getegid] = PLEDGE_STDIO, 122 [SYS_getresgid] = PLEDGE_STDIO, 123 [SYS_getgroups] = PLEDGE_STDIO, 124 [SYS_getlogin_r] = PLEDGE_STDIO, 125 [SYS_getpgrp] = PLEDGE_STDIO, 126 [SYS_getpgid] = PLEDGE_STDIO, 127 [SYS_getppid] = PLEDGE_STDIO, 128 [SYS_getsid] = PLEDGE_STDIO, 129 [SYS_getthrid] = PLEDGE_STDIO, 130 [SYS_getrlimit] = PLEDGE_STDIO, 131 [SYS_getrtable] = PLEDGE_STDIO, 132 [SYS_gettimeofday] = PLEDGE_STDIO, 133 [SYS_getdtablecount] = PLEDGE_STDIO, 134 [SYS_getrusage] = PLEDGE_STDIO, 135 [SYS_issetugid] = PLEDGE_STDIO, 136 [SYS_clock_getres] = PLEDGE_STDIO, 137 [SYS_clock_gettime] = PLEDGE_STDIO, 138 [SYS_getpid] = PLEDGE_STDIO, 139 140 /* 141 * Almost exclusively read-only, Very narrow subset. 142 * Use of "route", "inet", "dns", "ps", or "vminfo" 143 * expands access. 144 */ 145 [SYS_sysctl] = PLEDGE_STDIO, 146 147 /* For moncontrol(3). Only allowed to disable profiling. */ 148 [SYS_profil] = 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_mimmutable] = PLEDGE_STDIO, 157 [SYS_mquery] = PLEDGE_STDIO, 158 [SYS_munmap] = PLEDGE_STDIO, 159 [SYS_msync] = PLEDGE_STDIO, 160 [SYS_break] = PLEDGE_STDIO, 161 162 [SYS_umask] = PLEDGE_STDIO, 163 164 /* read/write operations */ 165 [SYS_read] = PLEDGE_STDIO, 166 [SYS_readv] = PLEDGE_STDIO, 167 [SYS_pread] = PLEDGE_STDIO, 168 [SYS_preadv] = PLEDGE_STDIO, 169 [SYS_write] = PLEDGE_STDIO, 170 [SYS_writev] = PLEDGE_STDIO, 171 [SYS_pwrite] = PLEDGE_STDIO, 172 [SYS_pwritev] = PLEDGE_STDIO, 173 [SYS_recvmsg] = PLEDGE_STDIO, 174 [SYS_recvmmsg] = PLEDGE_STDIO, 175 [SYS_recvfrom] = PLEDGE_STDIO, 176 [SYS_ftruncate] = PLEDGE_STDIO, 177 [SYS_lseek] = PLEDGE_STDIO, 178 [SYS_fpathconf] = PLEDGE_STDIO, 179 180 /* 181 * Address selection required a network pledge ("inet", 182 * "unix", "dns". 183 */ 184 [SYS_sendto] = PLEDGE_STDIO, 185 186 /* 187 * Address specification required a network pledge ("inet", 188 * "unix", "dns". SCM_RIGHTS requires "sendfd" or "recvfd". 189 */ 190 [SYS_sendmsg] = PLEDGE_STDIO, 191 [SYS_sendmmsg] = 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_kqueue1] = PLEDGE_STDIO, 212 [SYS_select] = PLEDGE_STDIO, 213 [SYS_pselect] = PLEDGE_STDIO, 214 215 [SYS_fstat] = PLEDGE_STDIO, 216 [SYS_fsync] = PLEDGE_STDIO, 217 218 [SYS_setsockopt] = PLEDGE_STDIO, /* narrow whitelist */ 219 [SYS_getsockopt] = PLEDGE_STDIO, /* narrow whitelist */ 220 221 /* F_SETOWN requires PLEDGE_PROC */ 222 [SYS_fcntl] = PLEDGE_STDIO, 223 224 [SYS_close] = PLEDGE_STDIO, 225 [SYS_dup] = PLEDGE_STDIO, 226 [SYS_dup2] = PLEDGE_STDIO, 227 [SYS_dup3] = PLEDGE_STDIO, 228 [SYS_closefrom] = PLEDGE_STDIO, 229 [SYS_shutdown] = PLEDGE_STDIO, 230 [SYS_fchdir] = PLEDGE_STDIO, /* XXX consider tightening */ 231 232 [SYS_pipe] = PLEDGE_STDIO, 233 [SYS_pipe2] = PLEDGE_STDIO, 234 [SYS_socketpair] = PLEDGE_STDIO, 235 236 [SYS_wait4] = PLEDGE_STDIO, 237 [SYS_waitid] = PLEDGE_STDIO, 238 239 /* 240 * Can kill self with "stdio". Killing another pid 241 * requires "proc" 242 */ 243 [SYS_kill] = PLEDGE_STDIO, 244 245 /* 246 * FIONREAD/FIONBIO for "stdio" 247 * Other ioctl are selectively allowed based upon other pledges. 248 */ 249 [SYS_ioctl] = PLEDGE_STDIO, 250 251 /* 252 * Path access/creation calls encounter many extensive 253 * checks done during pledge_namei() 254 */ 255 [SYS_open] = PLEDGE_STDIO, 256 [SYS_stat] = PLEDGE_STDIO, 257 [SYS_access] = PLEDGE_STDIO, 258 [SYS_readlink] = PLEDGE_STDIO, 259 [SYS___realpath] = PLEDGE_STDIO, 260 261 [SYS_adjtime] = PLEDGE_STDIO, /* setting requires "settime" */ 262 [SYS_adjfreq] = PLEDGE_SETTIME, 263 [SYS_settimeofday] = PLEDGE_SETTIME, 264 265 /* 266 * Needed by threaded programs 267 * XXX should we have a new "threads"? 268 */ 269 [SYS___tfork] = PLEDGE_STDIO, 270 [SYS_sched_yield] = PLEDGE_STDIO, 271 [SYS_futex] = PLEDGE_STDIO, 272 [SYS___thrsleep] = PLEDGE_STDIO, 273 [SYS___thrwakeup] = PLEDGE_STDIO, 274 [SYS___threxit] = PLEDGE_STDIO, 275 [SYS___thrsigdivert] = PLEDGE_STDIO, 276 [SYS_getthrname] = PLEDGE_STDIO, 277 [SYS_setthrname] = PLEDGE_STDIO, 278 279 [SYS_fork] = PLEDGE_PROC, 280 [SYS_vfork] = PLEDGE_PROC, 281 [SYS_setpgid] = PLEDGE_PROC, 282 [SYS_setsid] = PLEDGE_PROC, 283 284 [SYS_setrlimit] = PLEDGE_PROC | PLEDGE_ID, 285 [SYS_getpriority] = PLEDGE_PROC | PLEDGE_ID, 286 287 [SYS_setpriority] = PLEDGE_PROC | PLEDGE_ID, 288 289 [SYS_setuid] = PLEDGE_ID, 290 [SYS_seteuid] = PLEDGE_ID, 291 [SYS_setreuid] = PLEDGE_ID, 292 [SYS_setresuid] = PLEDGE_ID, 293 [SYS_setgid] = PLEDGE_ID, 294 [SYS_setegid] = PLEDGE_ID, 295 [SYS_setregid] = PLEDGE_ID, 296 [SYS_setresgid] = PLEDGE_ID, 297 [SYS_setgroups] = PLEDGE_ID, 298 [SYS_setlogin] = PLEDGE_ID, 299 [SYS_setrtable] = PLEDGE_ID, 300 301 [SYS_unveil] = PLEDGE_UNVEIL, 302 303 [SYS_execve] = PLEDGE_EXEC, 304 305 [SYS_chdir] = PLEDGE_RPATH, 306 [SYS_openat] = PLEDGE_RPATH | PLEDGE_WPATH, 307 [SYS_fstatat] = PLEDGE_RPATH | PLEDGE_WPATH, 308 [SYS_faccessat] = PLEDGE_RPATH | PLEDGE_WPATH, 309 [SYS_readlinkat] = PLEDGE_RPATH | PLEDGE_WPATH, 310 [SYS_lstat] = PLEDGE_RPATH | PLEDGE_WPATH | PLEDGE_TMPPATH, 311 [SYS_truncate] = PLEDGE_WPATH, 312 [SYS_rename] = PLEDGE_RPATH | PLEDGE_CPATH, 313 [SYS_rmdir] = PLEDGE_CPATH, 314 [SYS_renameat] = PLEDGE_CPATH, 315 [SYS_link] = PLEDGE_CPATH, 316 [SYS_linkat] = PLEDGE_CPATH, 317 [SYS_symlink] = PLEDGE_CPATH, 318 [SYS_symlinkat] = PLEDGE_CPATH, 319 [SYS_unlink] = PLEDGE_CPATH | PLEDGE_TMPPATH, 320 [SYS_unlinkat] = PLEDGE_CPATH, 321 [SYS_mkdir] = PLEDGE_CPATH, 322 [SYS_mkdirat] = PLEDGE_CPATH, 323 324 [SYS_mkfifo] = PLEDGE_DPATH, 325 [SYS_mkfifoat] = PLEDGE_DPATH, 326 [SYS_mknod] = PLEDGE_DPATH, 327 [SYS_mknodat] = PLEDGE_DPATH, 328 329 [SYS_revoke] = PLEDGE_TTY, /* also requires PLEDGE_RPATH */ 330 331 /* 332 * Classify as RPATH|WPATH, because of path information leakage. 333 * WPATH due to unknown use of mk*temp(3) on non-/tmp paths.. 334 */ 335 [SYS___getcwd] = PLEDGE_RPATH | PLEDGE_WPATH, 336 337 /* Classify as RPATH, because these leak path information */ 338 [SYS_getdents] = PLEDGE_RPATH, 339 [SYS_getfsstat] = PLEDGE_RPATH, 340 [SYS_statfs] = PLEDGE_RPATH, 341 [SYS_fstatfs] = PLEDGE_RPATH, 342 [SYS_pathconf] = PLEDGE_RPATH, 343 [SYS_pathconfat] = PLEDGE_RPATH, 344 345 [SYS_utimes] = PLEDGE_FATTR, 346 [SYS_futimes] = PLEDGE_FATTR, 347 [SYS_utimensat] = PLEDGE_FATTR, 348 [SYS_futimens] = PLEDGE_FATTR, 349 [SYS_chmod] = PLEDGE_FATTR, 350 [SYS_fchmod] = PLEDGE_FATTR, 351 [SYS_fchmodat] = PLEDGE_FATTR, 352 [SYS_chflags] = PLEDGE_FATTR, 353 [SYS_chflagsat] = PLEDGE_FATTR, 354 [SYS_fchflags] = PLEDGE_FATTR, 355 356 [SYS_chown] = PLEDGE_CHOWN, 357 [SYS_fchownat] = PLEDGE_CHOWN, 358 [SYS_lchown] = PLEDGE_CHOWN, 359 [SYS_fchown] = PLEDGE_CHOWN, 360 361 [SYS_socket] = PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS, 362 [SYS_connect] = PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS, 363 [SYS_bind] = PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS, 364 [SYS_getsockname] = PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS, 365 366 [SYS_listen] = PLEDGE_INET | PLEDGE_UNIX, 367 [SYS_accept4] = PLEDGE_INET | PLEDGE_UNIX, 368 [SYS_accept] = PLEDGE_INET | PLEDGE_UNIX, 369 [SYS_getpeername] = PLEDGE_INET | PLEDGE_UNIX, 370 371 [SYS_flock] = PLEDGE_FLOCK, 372 373 [SYS_ypconnect] = PLEDGE_GETPW, 374 375 [SYS_swapctl] = PLEDGE_VMINFO, 376}; 377 378static const struct { 379 char *name; 380 uint64_t flags; 381} pledgereq[] = { 382 { "audio", PLEDGE_AUDIO }, 383 { "bpf", PLEDGE_BPF }, 384 { "chown", PLEDGE_CHOWN | PLEDGE_CHOWNUID }, 385 { "cpath", PLEDGE_CPATH }, 386 { "disklabel", PLEDGE_DISKLABEL }, 387 { "dns", PLEDGE_DNS }, 388 { "dpath", PLEDGE_DPATH }, 389 { "drm", PLEDGE_DRM }, 390 { "error", PLEDGE_ERROR }, 391 { "exec", PLEDGE_EXEC }, 392 { "fattr", PLEDGE_FATTR | PLEDGE_CHOWN }, 393 { "flock", PLEDGE_FLOCK }, 394 { "getpw", PLEDGE_GETPW }, 395 { "id", PLEDGE_ID }, 396 { "inet", PLEDGE_INET }, 397 { "mcast", PLEDGE_MCAST }, 398 { "pf", PLEDGE_PF }, 399 { "proc", PLEDGE_PROC }, 400 { "prot_exec", PLEDGE_PROTEXEC }, 401 { "ps", PLEDGE_PS }, 402 { "recvfd", PLEDGE_RECVFD }, 403 { "route", PLEDGE_ROUTE }, 404 { "rpath", PLEDGE_RPATH }, 405 { "sendfd", PLEDGE_SENDFD }, 406 { "settime", PLEDGE_SETTIME }, 407 { "stdio", PLEDGE_STDIO }, 408 { "tape", PLEDGE_TAPE }, 409 { "tmppath", PLEDGE_TMPPATH }, 410 { "tty", PLEDGE_TTY }, 411 { "unix", PLEDGE_UNIX }, 412 { "unveil", PLEDGE_UNVEIL }, 413 { "video", PLEDGE_VIDEO }, 414 { "vminfo", PLEDGE_VMINFO }, 415 { "vmm", PLEDGE_VMM }, 416 { "wpath", PLEDGE_WPATH }, 417 { "wroute", PLEDGE_WROUTE }, 418}; 419 420int 421parsepledges(struct proc *p, const char *kname, const char *promises, u_int64_t *fp) 422{ 423 size_t rbuflen; 424 char *rbuf, *rp, *pn; 425 u_int64_t flags = 0, f; 426 int error; 427 428 rbuf = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 429 error = copyinstr(promises, rbuf, MAXPATHLEN, &rbuflen); 430 if (error) { 431 free(rbuf, M_TEMP, MAXPATHLEN); 432 return (error); 433 } 434#ifdef KTRACE 435 if (KTRPOINT(p, KTR_STRUCT)) 436 ktrstruct(p, kname, rbuf, rbuflen-1); 437#endif 438 439 for (rp = rbuf; rp && *rp; rp = pn) { 440 pn = strchr(rp, ' '); /* find terminator */ 441 if (pn) { 442 while (*pn == ' ') 443 *pn++ = '\0'; 444 } 445 if ((f = pledgereq_flags(rp)) == 0) { 446 free(rbuf, M_TEMP, MAXPATHLEN); 447 return (EINVAL); 448 } 449 flags |= f; 450 } 451 free(rbuf, M_TEMP, MAXPATHLEN); 452 *fp = flags; 453 return 0; 454} 455 456int 457sys_pledge(struct proc *p, void *v, register_t *retval) 458{ 459 struct sys_pledge_args /* { 460 syscallarg(const char *)promises; 461 syscallarg(const char *)execpromises; 462 } */ *uap = v; 463 struct process *pr = p->p_p; 464 uint64_t promises, execpromises; 465 int error; 466 int unveil_cleanup = 0; 467 468 /* Check for any error in user input */ 469 if (SCARG(uap, promises)) { 470 error = parsepledges(p, "pledgereq", 471 SCARG(uap, promises), &promises); 472 if (error) 473 return (error); 474 } 475 if (SCARG(uap, execpromises)) { 476 error = parsepledges(p, "pledgeexecreq", 477 SCARG(uap, execpromises), &execpromises); 478 if (error) 479 return (error); 480 } 481 482 mtx_enter(&pr->ps_mtx); 483 484 /* Check for any error wrt current promises */ 485 if (SCARG(uap, promises)) { 486 /* In "error" mode, ignore promise increase requests, 487 * but accept promise decrease requests */ 488 if (ISSET(pr->ps_flags, PS_PLEDGE) && 489 (pr->ps_pledge & PLEDGE_ERROR)) 490 promises &= (pr->ps_pledge & PLEDGE_USERSET); 491 492 /* Only permit reductions */ 493 if (ISSET(pr->ps_flags, PS_PLEDGE) && 494 (((promises | pr->ps_pledge) != pr->ps_pledge))) { 495 mtx_leave(&pr->ps_mtx); 496 return (EPERM); 497 } 498 } 499 if (SCARG(uap, execpromises)) { 500 /* Only permit reductions */ 501 if (ISSET(pr->ps_flags, PS_EXECPLEDGE) && 502 (((execpromises | pr->ps_execpledge) != pr->ps_execpledge))) { 503 mtx_leave(&pr->ps_mtx); 504 return (EPERM); 505 } 506 } 507 508 /* Set up promises */ 509 if (SCARG(uap, promises)) { 510 pr->ps_pledge = promises; 511 atomic_setbits_int(&pr->ps_flags, PS_PLEDGE); 512 513 if ((pr->ps_pledge & (PLEDGE_RPATH | PLEDGE_WPATH | 514 PLEDGE_CPATH | PLEDGE_DPATH | PLEDGE_TMPPATH | PLEDGE_EXEC | 515 PLEDGE_UNIX | PLEDGE_UNVEIL)) == 0) 516 unveil_cleanup = 1; 517 } 518 if (SCARG(uap, execpromises)) { 519 pr->ps_execpledge = execpromises; 520 atomic_setbits_int(&pr->ps_flags, PS_EXECPLEDGE); 521 } 522 523 mtx_leave(&pr->ps_mtx); 524 525 if (unveil_cleanup) { 526 /* 527 * Kill off unveil and drop unveil vnode refs if we no 528 * longer are holding any path-accessing pledge 529 */ 530 KERNEL_LOCK(); 531 unveil_destroy(pr); 532 KERNEL_UNLOCK(); 533 } 534 535 return (0); 536} 537 538int 539pledge_syscall(struct proc *p, int code, uint64_t *tval) 540{ 541 p->p_pledge_syscall = code; 542 *tval = 0; 543 544 if (code < 0 || code > SYS_MAXSYSCALL - 1) 545 return (EINVAL); 546 547 if (pledge_syscalls[code] == PLEDGE_ALWAYS) 548 return (0); 549 550 if (p->p_p->ps_pledge & pledge_syscalls[code]) 551 return (0); 552 553 *tval = pledge_syscalls[code]; 554 return (EPERM); 555} 556 557int 558pledge_fail(struct proc *p, int error, uint64_t code) 559{ 560 const char *codes = ""; 561 int i; 562 563 /* Print first matching pledge */ 564 for (i = 0; code && pledgenames[i].bits != 0; i++) 565 if (pledgenames[i].bits & code) { 566 codes = pledgenames[i].name; 567 break; 568 } 569#ifdef KTRACE 570 if (KTRPOINT(p, KTR_PLEDGE)) 571 ktrpledge(p, error, code, p->p_pledge_syscall); 572#endif 573 if (p->p_p->ps_pledge & PLEDGE_ERROR) 574 return (ENOSYS); 575 576 KERNEL_LOCK(); 577 uprintf("%s[%d]: pledge \"%s\", syscall %d\n", 578 p->p_p->ps_comm, p->p_p->ps_pid, codes, p->p_pledge_syscall); 579 p->p_p->ps_acflag |= APLEDGE; 580 581 /* Try to stop threads immediately, because this process is suspect */ 582 if (P_HASSIBLING(p)) 583 single_thread_set(p, SINGLE_UNWIND | SINGLE_DEEP); 584 585 /* Send uncatchable SIGABRT for coredump */ 586 sigabort(p); 587 588 p->p_p->ps_pledge = 0; /* Disable all PLEDGE_ flags */ 589 KERNEL_UNLOCK(); 590 return (error); 591} 592 593/* 594 * Need to make it more obvious that one cannot get through here 595 * without the right flags set 596 */ 597int 598pledge_namei(struct proc *p, struct nameidata *ni, char *origpath) 599{ 600 char path[PATH_MAX]; 601 uint64_t pledge; 602 int error; 603 604 if ((p->p_p->ps_flags & PS_PLEDGE) == 0 || 605 (p->p_p->ps_flags & PS_COREDUMP)) 606 return (0); 607 pledge = READ_ONCE(p->p_p->ps_pledge); 608 609 if (ni->ni_pledge == 0) 610 panic("pledge_namei: ni_pledge"); 611 612 /* 613 * We set the BYPASSUNVEIL flag to skip unveil checks 614 * as necessary 615 */ 616 617 /* Doing a permitted execve() */ 618 if ((ni->ni_pledge & PLEDGE_EXEC) && 619 (pledge & PLEDGE_EXEC)) 620 return (0); 621 622 error = canonpath(origpath, path, sizeof(path)); 623 if (error) 624 return (error); 625 626 /* Detect what looks like a mkstemp(3) family operation */ 627 if ((pledge & PLEDGE_TMPPATH) && 628 (p->p_pledge_syscall == SYS_open) && 629 (ni->ni_pledge & PLEDGE_CPATH) && 630 strncmp(path, "/tmp/", sizeof("/tmp/") - 1) == 0) { 631 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 632 return (0); 633 } 634 635 /* Allow unlinking of a mkstemp(3) file... 636 * Good opportunity for strict checks here. 637 */ 638 if ((pledge & PLEDGE_TMPPATH) && 639 (p->p_pledge_syscall == SYS_unlink) && 640 strncmp(path, "/tmp/", sizeof("/tmp/") - 1) == 0) { 641 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 642 return (0); 643 } 644 645 /* Whitelisted paths */ 646 switch (p->p_pledge_syscall) { 647 case SYS_access: 648 /* tzset() needs this. */ 649 if (ni->ni_pledge == PLEDGE_RPATH && 650 strcmp(path, "/etc/localtime") == 0) { 651 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 652 return (0); 653 } 654 break; 655 case SYS_open: 656 /* daemon(3) or other such functions */ 657 if ((ni->ni_pledge & ~(PLEDGE_RPATH | PLEDGE_WPATH)) == 0 && 658 strcmp(path, "/dev/null") == 0) { 659 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 660 return (0); 661 } 662 663 /* readpassphrase(3), getpass(3) */ 664 if ((pledge & PLEDGE_TTY) && 665 (ni->ni_pledge & ~(PLEDGE_RPATH | PLEDGE_WPATH)) == 0 && 666 strcmp(path, "/dev/tty") == 0) { 667 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 668 return (0); 669 } 670 671 /* getpw* and friends need a few files */ 672 if ((ni->ni_pledge == PLEDGE_RPATH) && 673 (pledge & PLEDGE_GETPW)) { 674 if (strcmp(path, "/etc/spwd.db") == 0) 675 return (EPERM); /* don't call pledge_fail */ 676 if (strcmp(path, "/etc/pwd.db") == 0) { 677 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 678 return (0); 679 } 680 if (strcmp(path, "/etc/group") == 0) { 681 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 682 return (0); 683 } 684 if (strcmp(path, "/etc/netid") == 0) { 685 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 686 return (0); 687 } 688 } 689 690 /* DNS needs /etc/{resolv.conf,hosts,services,protocols}. */ 691 if ((ni->ni_pledge == PLEDGE_RPATH) && 692 (pledge & PLEDGE_DNS)) { 693 if (strcmp(path, "/etc/resolv.conf") == 0) { 694 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 695 return (0); 696 } 697 if (strcmp(path, "/etc/hosts") == 0) { 698 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 699 return (0); 700 } 701 if (strcmp(path, "/etc/services") == 0) { 702 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 703 return (0); 704 } 705 if (strcmp(path, "/etc/protocols") == 0) { 706 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 707 return (0); 708 } 709 } 710 711 /* tzset() needs these. */ 712 if ((ni->ni_pledge == PLEDGE_RPATH) && 713 strncmp(path, "/usr/share/zoneinfo/", 714 sizeof("/usr/share/zoneinfo/") - 1) == 0) { 715 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 716 return (0); 717 } 718 if ((ni->ni_pledge == PLEDGE_RPATH) && 719 strcmp(path, "/etc/localtime") == 0) { 720 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 721 return (0); 722 } 723 724 break; 725 case SYS_stat: 726 /* DNS needs /etc/{resolv.conf,hosts}. */ 727 if ((ni->ni_pledge == PLEDGE_RPATH) && 728 (pledge & PLEDGE_DNS)) { 729 if (strcmp(path, "/etc/resolv.conf") == 0) { 730 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 731 return (0); 732 } 733 if (strcmp(path, "/etc/hosts") == 0) { 734 ni->ni_cnd.cn_flags |= BYPASSUNVEIL; 735 return (0); 736 } 737 } 738 break; 739 } 740 741 /* 742 * Ensure each flag of ni_pledge has counterpart allowing it in 743 * ps_pledge. 744 */ 745 if (ni->ni_pledge & ~pledge) 746 return (pledge_fail(p, EPERM, (ni->ni_pledge & ~pledge))); 747 748 /* continue, and check unveil if present */ 749 return (0); 750} 751 752/* 753 * Only allow reception of safe file descriptors. 754 */ 755int 756pledge_recvfd(struct proc *p, struct file *fp) 757{ 758 struct vnode *vp; 759 760 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 761 return (0); 762 if ((p->p_p->ps_pledge & PLEDGE_RECVFD) == 0) 763 return pledge_fail(p, EPERM, PLEDGE_RECVFD); 764 765 switch (fp->f_type) { 766 case DTYPE_SOCKET: 767 case DTYPE_PIPE: 768 case DTYPE_DMABUF: 769 case DTYPE_SYNC: 770 return (0); 771 case DTYPE_VNODE: 772 vp = fp->f_data; 773 774 if (vp->v_type != VDIR) 775 return (0); 776 } 777 return pledge_fail(p, EINVAL, PLEDGE_RECVFD); 778} 779 780/* 781 * Only allow sending of safe file descriptors. 782 */ 783int 784pledge_sendfd(struct proc *p, struct file *fp) 785{ 786 struct vnode *vp; 787 788 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 789 return (0); 790 if ((p->p_p->ps_pledge & PLEDGE_SENDFD) == 0) 791 return pledge_fail(p, EPERM, PLEDGE_SENDFD); 792 793 switch (fp->f_type) { 794 case DTYPE_SOCKET: 795 case DTYPE_PIPE: 796 case DTYPE_DMABUF: 797 case DTYPE_SYNC: 798 return (0); 799 case DTYPE_VNODE: 800 vp = fp->f_data; 801 802 if (vp->v_type != VDIR) 803 return (0); 804 break; 805 } 806 return pledge_fail(p, EINVAL, PLEDGE_SENDFD); 807} 808 809int 810pledge_sysctl(struct proc *p, int miblen, int *mib, void *new) 811{ 812 char buf[80]; 813 uint64_t pledge; 814 int i; 815 816 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 817 return (0); 818 pledge = READ_ONCE(p->p_p->ps_pledge); 819 820 if (new) 821 return pledge_fail(p, EFAULT, 0); 822 823 /* routing table observation */ 824 if ((pledge & PLEDGE_ROUTE)) { 825 if ((miblen == 6 || miblen == 7) && 826 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 827 mib[2] == 0 && 828 mib[4] == NET_RT_DUMP) 829 return (0); 830 831 if (miblen == 6 && 832 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 833 mib[2] == 0 && 834 (mib[3] == 0 || mib[3] == AF_INET6 || mib[3] == AF_INET) && 835 (mib[4] == NET_RT_TABLE || mib[4] == NET_RT_SOURCE)) 836 return (0); 837 838 if (miblen == 7 && /* exposes MACs */ 839 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 840 mib[2] == 0 && 841 (mib[3] == 0 || mib[3] == AF_INET6 || mib[3] == AF_INET) && 842 mib[4] == NET_RT_FLAGS && mib[5] == RTF_LLINFO) 843 return (0); 844 } 845 846 if ((pledge & PLEDGE_WROUTE)) { 847 if (miblen == 4 && 848 mib[0] == CTL_NET && mib[1] == PF_INET6 && 849 mib[2] == IPPROTO_IPV6 && mib[3] == IPV6CTL_SOIIKEY) 850 return (0); 851 } 852 853 if (pledge & (PLEDGE_PS | PLEDGE_VMINFO)) { 854 if (miblen == 2 && /* kern.fscale */ 855 mib[0] == CTL_KERN && mib[1] == KERN_FSCALE) 856 return (0); 857 if (miblen == 2 && /* kern.boottime */ 858 mib[0] == CTL_KERN && mib[1] == KERN_BOOTTIME) 859 return (0); 860 if (miblen == 2 && /* kern.consdev */ 861 mib[0] == CTL_KERN && mib[1] == KERN_CONSDEV) 862 return (0); 863 if (miblen == 2 && /* kern.cptime */ 864 mib[0] == CTL_KERN && mib[1] == KERN_CPTIME) 865 return (0); 866 if (miblen == 3 && /* kern.cptime2 */ 867 mib[0] == CTL_KERN && mib[1] == KERN_CPTIME2) 868 return (0); 869 if (miblen == 3 && /* kern.cpustats */ 870 mib[0] == CTL_KERN && mib[1] == KERN_CPUSTATS) 871 return (0); 872 } 873 874 if ((pledge & PLEDGE_PS)) { 875 if (miblen == 4 && /* kern.procargs.* */ 876 mib[0] == CTL_KERN && mib[1] == KERN_PROC_ARGS && 877 (mib[3] == KERN_PROC_ARGV || mib[3] == KERN_PROC_ENV)) 878 return (0); 879 if (miblen == 6 && /* kern.proc.* */ 880 mib[0] == CTL_KERN && mib[1] == KERN_PROC) 881 return (0); 882 if (miblen == 3 && /* kern.proc_cwd.* */ 883 mib[0] == CTL_KERN && mib[1] == KERN_PROC_CWD) 884 return (0); 885 if (miblen == 2 && /* kern.ccpu */ 886 mib[0] == CTL_KERN && mib[1] == KERN_CCPU) 887 return (0); 888 if (miblen == 2 && /* vm.maxslp */ 889 mib[0] == CTL_VM && mib[1] == VM_MAXSLP) 890 return (0); 891 } 892 893 if ((pledge & PLEDGE_VMINFO)) { 894 if (miblen == 2 && /* vm.uvmexp */ 895 mib[0] == CTL_VM && mib[1] == VM_UVMEXP) 896 return (0); 897 if (miblen == 3 && /* vfs.generic.bcachestat */ 898 mib[0] == CTL_VFS && mib[1] == VFS_GENERIC && 899 mib[2] == VFS_BCACHESTAT) 900 return (0); 901 if (miblen == 3 && /* for sysconf(3) */ 902 mib[0] == CTL_NET && mib[1] == PF_INET6) 903 return (0); 904 } 905 906 if ((pledge & (PLEDGE_INET | PLEDGE_UNIX))) { 907 if (miblen == 2 && /* kern.somaxconn */ 908 mib[0] == CTL_KERN && mib[1] == KERN_SOMAXCONN) 909 return (0); 910 } 911 912 if ((pledge & (PLEDGE_ROUTE | PLEDGE_INET | PLEDGE_DNS))) { 913 if (miblen == 6 && /* getifaddrs() */ 914 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 915 mib[2] == 0 && 916 (mib[3] == 0 || mib[3] == AF_INET6 || mib[3] == AF_INET) && 917 mib[4] == NET_RT_IFLIST) 918 return (0); 919 } 920 921 if ((pledge & PLEDGE_DISKLABEL)) { 922 if (miblen == 2 && /* kern.rawpartition */ 923 mib[0] == CTL_KERN && 924 mib[1] == KERN_RAWPARTITION) 925 return (0); 926 if (miblen == 2 && /* kern.maxpartitions */ 927 mib[0] == CTL_KERN && 928 mib[1] == KERN_MAXPARTITIONS) 929 return (0); 930#ifdef CPU_CHR2BLK 931 if (miblen == 3 && /* machdep.chr2blk */ 932 mib[0] == CTL_MACHDEP && 933 mib[1] == CPU_CHR2BLK) 934 return (0); 935#endif /* CPU_CHR2BLK */ 936 } 937 938 if (miblen >= 3 && /* ntpd(8) to read sensors */ 939 mib[0] == CTL_HW && mib[1] == HW_SENSORS) 940 return (0); 941 942 if (miblen == 6 && /* if_nameindex() */ 943 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 944 mib[2] == 0 && mib[3] == 0 && mib[4] == NET_RT_IFNAMES) 945 return (0); 946 947 if (miblen == 2) { 948 switch (mib[0]) { 949 case CTL_KERN: 950 switch (mib[1]) { 951 case KERN_DOMAINNAME: /* getdomainname() */ 952 case KERN_HOSTNAME: /* gethostname() */ 953 case KERN_OSTYPE: /* uname() */ 954 case KERN_OSRELEASE: /* uname() */ 955 case KERN_OSVERSION: /* uname() */ 956 case KERN_VERSION: /* uname() */ 957 case KERN_CLOCKRATE: /* kern.clockrate */ 958 case KERN_ARGMAX: /* kern.argmax */ 959 case KERN_NGROUPS: /* kern.ngroups */ 960 case KERN_SYSVSHM: /* kern.sysvshm */ 961 case KERN_POSIX1: /* kern.posix1version */ 962 case KERN_AUTOCONF_SERIAL: /* kern.autoconf_serial */ 963 return (0); 964 } 965 break; 966 case CTL_HW: 967 switch (mib[1]) { 968 case HW_MACHINE: /* uname() */ 969 case HW_PAGESIZE: /* getpagesize() */ 970 case HW_PHYSMEM64: /* hw.physmem */ 971 case HW_NCPU: /* hw.ncpu */ 972 case HW_NCPUONLINE: /* hw.ncpuonline */ 973 case HW_USERMEM64: /* hw.usermem */ 974 return (0); 975 } 976 break; 977 case CTL_VM: 978 switch (mib[1]) { 979 case VM_PSSTRINGS: /* setproctitle() */ 980 case VM_LOADAVG: /* vm.loadavg / getloadavg(3) */ 981 case VM_MALLOC_CONF: /* vm.malloc_conf */ 982 return (0); 983 } 984 break; 985 default: 986 break; 987 } 988 } 989 990#ifdef CPU_SSE 991 if (miblen == 2 && /* i386 libm tests for SSE */ 992 mib[0] == CTL_MACHDEP && mib[1] == CPU_SSE) 993 return (0); 994#endif /* CPU_SSE */ 995 996#ifdef CPU_ID_AA64ISAR0 997 if (miblen == 2 && /* arm64 libcrypto inspects CPU features */ 998 mib[0] == CTL_MACHDEP && mib[1] == CPU_ID_AA64ISAR0) 999 return (0); 1000#endif /* CPU_ID_AA64ISAR0 */ 1001 1002 snprintf(buf, sizeof(buf), "%s(%d): pledge sysctl %d:", 1003 p->p_p->ps_comm, p->p_p->ps_pid, miblen); 1004 for (i = 0; i < miblen; i++) { 1005 char *s = buf + strlen(buf); 1006 snprintf(s, sizeof(buf) - (s - buf), " %d", mib[i]); 1007 } 1008 uprintf("%s\n", buf); 1009 1010 return pledge_fail(p, EINVAL, 0); 1011} 1012 1013int 1014pledge_chown(struct proc *p, uid_t uid, gid_t gid) 1015{ 1016 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1017 return (0); 1018 1019 if (p->p_p->ps_pledge & PLEDGE_CHOWNUID) 1020 return (0); 1021 1022 if (uid != -1 && uid != p->p_ucred->cr_uid) 1023 return (EPERM); 1024 if (gid != -1 && !groupmember(gid, p->p_ucred)) 1025 return (EPERM); 1026 return (0); 1027} 1028 1029int 1030pledge_adjtime(struct proc *p, const void *v) 1031{ 1032 const struct timeval *delta = v; 1033 1034 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1035 return (0); 1036 1037 if ((p->p_p->ps_pledge & PLEDGE_SETTIME)) 1038 return (0); 1039 if (delta) 1040 return (EPERM); 1041 return (0); 1042} 1043 1044int 1045pledge_sendit(struct proc *p, const void *to) 1046{ 1047 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1048 return (0); 1049 1050 if ((p->p_p->ps_pledge & (PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS))) 1051 return (0); /* may use address */ 1052 if (to == NULL) 1053 return (0); /* behaves just like write */ 1054 return pledge_fail(p, EPERM, PLEDGE_INET); 1055} 1056 1057int 1058pledge_ioctl(struct proc *p, long com, struct file *fp) 1059{ 1060 struct vnode *vp = NULL; 1061 int error = EPERM; 1062 uint64_t pledge; 1063 1064 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1065 return (0); 1066 pledge = READ_ONCE(p->p_p->ps_pledge); 1067 1068 /* 1069 * The ioctl's which are always allowed. 1070 */ 1071 switch (com) { 1072 case FIONREAD: 1073 case FIONBIO: 1074 case FIOCLEX: 1075 case FIONCLEX: 1076 return (0); 1077 } 1078 1079 /* fp != NULL was already checked */ 1080 if (fp->f_type == DTYPE_VNODE) { 1081 vp = fp->f_data; 1082 if (vp->v_type == VBAD) 1083 return (ENOTTY); 1084 } 1085 1086 if ((pledge & PLEDGE_INET)) { 1087 switch (com) { 1088 case SIOCATMARK: 1089 case SIOCGIFGROUP: 1090 if (fp->f_type == DTYPE_SOCKET) 1091 return (0); 1092 break; 1093 } 1094 } 1095 1096#if NBPFILTER > 0 1097 if ((pledge & PLEDGE_BPF)) { 1098 switch (com) { 1099 case BIOCGSTATS: /* bpf: tcpdump privsep on ^C */ 1100 if (fp->f_type == DTYPE_VNODE && 1101 fp->f_ops->fo_ioctl == vn_ioctl && 1102 vp->v_type == VCHR && 1103 cdevsw[major(vp->v_rdev)].d_open == bpfopen) 1104 return (0); 1105 break; 1106 } 1107 } 1108#endif /* NBPFILTER > 0 */ 1109 1110 if ((pledge & PLEDGE_TAPE)) { 1111 switch (com) { 1112 case MTIOCGET: 1113 case MTIOCTOP: 1114 /* for pax(1) and such, checking tapes... */ 1115 if (fp->f_type == DTYPE_VNODE && 1116 vp->v_type == VCHR) { 1117 if (vp->v_flag & VISTTY) 1118 return (ENOTTY); 1119 else 1120 return (0); 1121 } 1122 break; 1123 } 1124 } 1125 1126#if NDRM > 0 1127 if ((pledge & PLEDGE_DRM)) { 1128 if ((fp->f_type == DTYPE_VNODE) && 1129 (vp->v_type == VCHR) && 1130 (cdevsw[major(vp->v_rdev)].d_open == drmopen)) { 1131 error = pledge_ioctl_drm(p, com, vp->v_rdev); 1132 if (error == 0) 1133 return 0; 1134 } 1135 } 1136#endif /* NDRM > 0 */ 1137 1138#if NAUDIO > 0 1139 if ((pledge & PLEDGE_AUDIO)) { 1140 switch (com) { 1141 case AUDIO_GETDEV: 1142 case AUDIO_GETPOS: 1143 case AUDIO_GETPAR: 1144 case AUDIO_SETPAR: 1145 case AUDIO_START: 1146 case AUDIO_STOP: 1147 case AUDIO_MIXER_DEVINFO: 1148 case AUDIO_MIXER_READ: 1149 case AUDIO_MIXER_WRITE: 1150 if (fp->f_type == DTYPE_VNODE && 1151 vp->v_type == VCHR && 1152 cdevsw[major(vp->v_rdev)].d_open == audioopen) 1153 return (0); 1154 } 1155 } 1156#endif /* NAUDIO > 0 */ 1157 1158 if ((pledge & PLEDGE_DISKLABEL)) { 1159 switch (com) { 1160 case DIOCGDINFO: 1161 case DIOCGPDINFO: 1162 case DIOCRLDINFO: 1163 case DIOCWDINFO: 1164 case BIOCDISK: 1165 case BIOCINQ: 1166 case BIOCINSTALLBOOT: 1167 case BIOCVOL: 1168 if (fp->f_type == DTYPE_VNODE && 1169 ((vp->v_type == VCHR && 1170 cdevsw[major(vp->v_rdev)].d_type == D_DISK) || 1171 (vp->v_type == VBLK && 1172 bdevsw[major(vp->v_rdev)].d_type == D_DISK))) 1173 return (0); 1174 break; 1175 case DIOCMAP: 1176 if (fp->f_type == DTYPE_VNODE && 1177 vp->v_type == VCHR && 1178 cdevsw[major(vp->v_rdev)].d_ioctl == diskmapioctl) 1179 return (0); 1180 break; 1181 } 1182 } 1183 1184#if NVIDEO > 0 1185 if ((pledge & PLEDGE_VIDEO)) { 1186 switch (com) { 1187 case VIDIOC_QUERYCAP: 1188 case VIDIOC_TRY_FMT: 1189 case VIDIOC_ENUM_FMT: 1190 case VIDIOC_S_FMT: 1191 case VIDIOC_QUERYCTRL: 1192 case VIDIOC_G_CTRL: 1193 case VIDIOC_S_CTRL: 1194 case VIDIOC_G_PARM: 1195 case VIDIOC_S_PARM: 1196 case VIDIOC_REQBUFS: 1197 case VIDIOC_QBUF: 1198 case VIDIOC_DQBUF: 1199 case VIDIOC_QUERYBUF: 1200 case VIDIOC_STREAMON: 1201 case VIDIOC_STREAMOFF: 1202 case VIDIOC_ENUM_FRAMESIZES: 1203 case VIDIOC_ENUM_FRAMEINTERVALS: 1204 case VIDIOC_DQEVENT: 1205 case VIDIOC_ENCODER_CMD: 1206 case VIDIOC_EXPBUF: 1207 case VIDIOC_G_CROP: 1208 case VIDIOC_G_EXT_CTRLS: 1209 case VIDIOC_G_FMT: 1210 case VIDIOC_G_SELECTION: 1211 case VIDIOC_QUERYMENU: 1212 case VIDIOC_SUBSCRIBE_EVENT: 1213 case VIDIOC_S_EXT_CTRLS: 1214 case VIDIOC_S_SELECTION: 1215 case VIDIOC_TRY_DECODER_CMD: 1216 case VIDIOC_TRY_ENCODER_CMD: 1217 if (fp->f_type == DTYPE_VNODE && 1218 vp->v_type == VCHR && 1219 cdevsw[major(vp->v_rdev)].d_open == videoopen) 1220 return (0); 1221 break; 1222 } 1223 } 1224#endif 1225 1226#if NPF > 0 1227 if ((pledge & PLEDGE_PF)) { 1228 switch (com) { 1229 case DIOCADDRULE: 1230 case DIOCGETSTATUS: 1231 case DIOCNATLOOK: 1232 case DIOCRADDTABLES: 1233 case DIOCRCLRADDRS: 1234 case DIOCRCLRTABLES: 1235 case DIOCRCLRTSTATS: 1236 case DIOCRGETTSTATS: 1237 case DIOCRSETADDRS: 1238 case DIOCXBEGIN: 1239 case DIOCXCOMMIT: 1240 case DIOCKILLSRCNODES: 1241 if ((fp->f_type == DTYPE_VNODE) && 1242 (vp->v_type == VCHR) && 1243 (cdevsw[major(vp->v_rdev)].d_open == pfopen)) 1244 return (0); 1245 break; 1246 } 1247 } 1248#endif 1249 1250 if ((pledge & PLEDGE_TTY)) { 1251 switch (com) { 1252#if NPTY > 0 1253 case PTMGET: 1254 if ((pledge & PLEDGE_RPATH) == 0) 1255 break; 1256 if ((pledge & PLEDGE_WPATH) == 0) 1257 break; 1258 if (fp->f_type != DTYPE_VNODE || vp->v_type != VCHR) 1259 break; 1260 if (cdevsw[major(vp->v_rdev)].d_open != ptmopen) 1261 break; 1262 return (0); 1263 case TIOCUCNTL: /* vmd */ 1264 if ((pledge & PLEDGE_RPATH) == 0) 1265 break; 1266 if ((pledge & PLEDGE_WPATH) == 0) 1267 break; 1268 if (cdevsw[major(vp->v_rdev)].d_open != ptcopen) 1269 break; 1270 return (0); 1271#endif /* NPTY > 0 */ 1272 case TIOCSPGRP: 1273 if ((pledge & PLEDGE_PROC) == 0) 1274 break; 1275 /* FALLTHROUGH */ 1276 case TIOCFLUSH: /* getty, telnet */ 1277 case TIOCSTART: /* emacs, etc */ 1278 case TIOCGPGRP: 1279 case TIOCGETA: 1280 case TIOCGWINSZ: /* ENOTTY return for non-tty */ 1281 case TIOCSTAT: /* csh */ 1282 if (fp->f_type == DTYPE_VNODE && (vp->v_flag & VISTTY)) 1283 return (0); 1284 return (ENOTTY); 1285 case TIOCSWINSZ: 1286 case TIOCEXT: /* mail, libedit .. */ 1287 case TIOCCBRK: /* cu */ 1288 case TIOCSBRK: /* cu */ 1289 case TIOCCDTR: /* cu */ 1290 case TIOCSDTR: /* cu */ 1291 case TIOCEXCL: /* cu */ 1292 case TIOCSETA: /* cu, ... */ 1293 case TIOCSETAW: /* cu, ... */ 1294 case TIOCSETAF: /* tcsetattr TCSAFLUSH, script */ 1295 case TIOCSCTTY: /* forkpty(3), login_tty(3), ... */ 1296 if (fp->f_type == DTYPE_VNODE && (vp->v_flag & VISTTY)) 1297 return (0); 1298 break; 1299 } 1300 } 1301 1302 if ((pledge & PLEDGE_ROUTE)) { 1303 switch (com) { 1304 case SIOCGIFADDR: 1305 case SIOCGIFAFLAG_IN6: 1306 case SIOCGIFALIFETIME_IN6: 1307 case SIOCGIFDESCR: 1308 case SIOCGIFFLAGS: 1309 case SIOCGIFMETRIC: 1310 case SIOCGIFGMEMB: 1311 case SIOCGIFRDOMAIN: 1312 case SIOCGIFDSTADDR_IN6: 1313 case SIOCGIFNETMASK_IN6: 1314 case SIOCGIFXFLAGS: 1315 case SIOCGNBRINFO_IN6: 1316 case SIOCGIFINFO_IN6: 1317 case SIOCGIFMEDIA: 1318 if (fp->f_type == DTYPE_SOCKET) 1319 return (0); 1320 break; 1321 } 1322 } 1323 1324 if ((pledge & PLEDGE_WROUTE)) { 1325 switch (com) { 1326 case SIOCAIFADDR: 1327 case SIOCDIFADDR: 1328 case SIOCAIFADDR_IN6: 1329 case SIOCDIFADDR_IN6: 1330 if (fp->f_type == DTYPE_SOCKET) 1331 return (0); 1332 break; 1333 case SIOCSIFMTU: 1334 if (fp->f_type == DTYPE_SOCKET) 1335 return (0); 1336 break; 1337 } 1338 } 1339 1340#if NVMM > 0 1341 if ((pledge & PLEDGE_VMM)) { 1342 if ((fp->f_type == DTYPE_VNODE) && 1343 (vp->v_type == VCHR) && 1344 (cdevsw[major(vp->v_rdev)].d_open == vmmopen)) { 1345 error = pledge_ioctl_vmm(p, com); 1346 if (error == 0) 1347 return 0; 1348 } 1349 } 1350#endif 1351 1352 return pledge_fail(p, error, PLEDGE_TTY); 1353} 1354 1355int 1356pledge_sockopt(struct proc *p, int set, int level, int optname) 1357{ 1358 uint64_t pledge; 1359 1360 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1361 return (0); 1362 pledge = READ_ONCE(p->p_p->ps_pledge); 1363 1364 /* Always allow these, which are too common to reject */ 1365 switch (level) { 1366 case SOL_SOCKET: 1367 switch (optname) { 1368 case SO_RCVBUF: 1369 case SO_ERROR: 1370 return (0); 1371 } 1372 break; 1373 case IPPROTO_TCP: 1374 switch (optname) { 1375 case TCP_NODELAY: 1376 return (0); 1377 } 1378 break; 1379 } 1380 1381 if ((pledge & PLEDGE_WROUTE)) { 1382 switch (level) { 1383 case SOL_SOCKET: 1384 switch (optname) { 1385 case SO_RTABLE: 1386 return (0); 1387 } 1388 } 1389 } 1390 1391 if ((pledge & (PLEDGE_INET|PLEDGE_UNIX|PLEDGE_DNS)) == 0) 1392 return pledge_fail(p, EPERM, PLEDGE_INET); 1393 /* In use by some service libraries */ 1394 switch (level) { 1395 case SOL_SOCKET: 1396 switch (optname) { 1397 case SO_TIMESTAMP: 1398 return (0); 1399 } 1400 break; 1401 } 1402 1403 /* DNS resolver may do these requests */ 1404 if ((pledge & PLEDGE_DNS)) { 1405 switch (level) { 1406 case IPPROTO_IPV6: 1407 switch (optname) { 1408 case IPV6_RECVPKTINFO: 1409 case IPV6_USE_MIN_MTU: 1410 return (0); 1411 } 1412 } 1413 } 1414 1415 if ((pledge & (PLEDGE_INET|PLEDGE_UNIX)) == 0) 1416 return pledge_fail(p, EPERM, PLEDGE_INET); 1417 switch (level) { 1418 case SOL_SOCKET: 1419 switch (optname) { 1420 case SO_RTABLE: 1421 return pledge_fail(p, EINVAL, PLEDGE_WROUTE); 1422 } 1423 return (0); 1424 } 1425 1426 if ((pledge & PLEDGE_INET) == 0) 1427 return pledge_fail(p, EPERM, PLEDGE_INET); 1428 switch (level) { 1429 case IPPROTO_TCP: 1430 switch (optname) { 1431 case TCP_MD5SIG: 1432 case TCP_SACK_ENABLE: 1433 case TCP_MAXSEG: 1434 case TCP_NOPUSH: 1435 case TCP_INFO: 1436 return (0); 1437 } 1438 break; 1439 case IPPROTO_IP: 1440 switch (optname) { 1441 case IP_OPTIONS: 1442 if (!set) 1443 return (0); 1444 break; 1445 case IP_TOS: 1446 case IP_TTL: 1447 case IP_MINTTL: 1448 case IP_IPDEFTTL: 1449 case IP_PORTRANGE: 1450 case IP_RECVDSTADDR: 1451 case IP_RECVDSTPORT: 1452 return (0); 1453 case IP_MULTICAST_IF: 1454 case IP_MULTICAST_TTL: 1455 case IP_MULTICAST_LOOP: 1456 case IP_ADD_MEMBERSHIP: 1457 case IP_DROP_MEMBERSHIP: 1458 if (pledge & PLEDGE_MCAST) 1459 return (0); 1460 break; 1461 } 1462 break; 1463 case IPPROTO_ICMP: 1464 break; 1465 case IPPROTO_IPV6: 1466 switch (optname) { 1467 case IPV6_TCLASS: 1468 case IPV6_UNICAST_HOPS: 1469 case IPV6_MINHOPCOUNT: 1470 case IPV6_RECVHOPLIMIT: 1471 case IPV6_PORTRANGE: 1472 case IPV6_RECVPKTINFO: 1473 case IPV6_RECVDSTPORT: 1474 case IPV6_V6ONLY: 1475 return (0); 1476 case IPV6_MULTICAST_IF: 1477 case IPV6_MULTICAST_HOPS: 1478 case IPV6_MULTICAST_LOOP: 1479 case IPV6_JOIN_GROUP: 1480 case IPV6_LEAVE_GROUP: 1481 if (pledge & PLEDGE_MCAST) 1482 return (0); 1483 break; 1484 } 1485 break; 1486 case IPPROTO_ICMPV6: 1487 break; 1488 } 1489 return pledge_fail(p, EPERM, PLEDGE_INET); 1490} 1491 1492int 1493pledge_socket(struct proc *p, int domain, unsigned int state) 1494{ 1495 uint64_t pledge; 1496 1497 if (!ISSET(p->p_p->ps_flags, PS_PLEDGE)) 1498 return 0; 1499 pledge = READ_ONCE(p->p_p->ps_pledge); 1500 1501 if (ISSET(state, SS_DNS)) { 1502 if (ISSET(pledge, PLEDGE_DNS)) 1503 return 0; 1504 return pledge_fail(p, EPERM, PLEDGE_DNS); 1505 } 1506 1507 switch (domain) { 1508 case -1: /* accept on any domain */ 1509 return (0); 1510 case AF_INET: 1511 case AF_INET6: 1512 if (ISSET(pledge, PLEDGE_INET)) 1513 return 0; 1514 return pledge_fail(p, EPERM, PLEDGE_INET); 1515 1516 case AF_UNIX: 1517 if (ISSET(pledge, PLEDGE_UNIX)) 1518 return 0; 1519 return pledge_fail(p, EPERM, PLEDGE_UNIX); 1520 } 1521 1522 return pledge_fail(p, EINVAL, PLEDGE_INET); 1523} 1524 1525int 1526pledge_flock(struct proc *p) 1527{ 1528 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1529 return (0); 1530 1531 if ((p->p_p->ps_pledge & PLEDGE_FLOCK)) 1532 return (0); 1533 return (pledge_fail(p, EPERM, PLEDGE_FLOCK)); 1534} 1535 1536int 1537pledge_swapctl(struct proc *p, int cmd) 1538{ 1539 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1540 return (0); 1541 1542 if (p->p_p->ps_pledge & PLEDGE_VMINFO) { 1543 switch (cmd) { 1544 case SWAP_NSWAP: 1545 case SWAP_STATS: 1546 return (0); 1547 } 1548 } 1549 1550 return pledge_fail(p, EPERM, PLEDGE_VMINFO); 1551} 1552 1553/* bsearch over pledgereq. return flags value if found, 0 else */ 1554uint64_t 1555pledgereq_flags(const char *req_name) 1556{ 1557 int base = 0, cmp, i, lim; 1558 1559 for (lim = nitems(pledgereq); lim != 0; lim >>= 1) { 1560 i = base + (lim >> 1); 1561 cmp = strcmp(req_name, pledgereq[i].name); 1562 if (cmp == 0) 1563 return (pledgereq[i].flags); 1564 if (cmp > 0) { /* not found before, move right */ 1565 base = i + 1; 1566 lim--; 1567 } /* else move left */ 1568 } 1569 return (0); 1570} 1571 1572int 1573pledge_fcntl(struct proc *p, int cmd) 1574{ 1575 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1576 return (0); 1577 if ((p->p_p->ps_pledge & PLEDGE_PROC) == 0 && cmd == F_SETOWN) 1578 return pledge_fail(p, EPERM, PLEDGE_PROC); 1579 return (0); 1580} 1581 1582int 1583pledge_kill(struct proc *p, pid_t pid) 1584{ 1585 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1586 return 0; 1587 if (p->p_p->ps_pledge & PLEDGE_PROC) 1588 return 0; 1589 if (pid == 0 || pid == p->p_p->ps_pid) 1590 return 0; 1591 return pledge_fail(p, EPERM, PLEDGE_PROC); 1592} 1593 1594int 1595pledge_profil(struct proc *p, u_int scale) 1596{ 1597 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1598 return 0; 1599 if (scale != 0) 1600 return pledge_fail(p, EPERM, PLEDGE_STDIO); 1601 return 0; 1602} 1603 1604int 1605pledge_protexec(struct proc *p, int prot) 1606{ 1607 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1608 return 0; 1609 /* Before kbind(2) call, ld.so and crt may create EXEC mappings */ 1610 if (p->p_p->ps_kbind_addr == 0 && p->p_p->ps_kbind_cookie == 0) 1611 return 0; 1612 if (!(p->p_p->ps_pledge & PLEDGE_PROTEXEC) && (prot & PROT_EXEC)) 1613 return pledge_fail(p, EPERM, PLEDGE_PROTEXEC); 1614 return 0; 1615} 1616 1617int 1618canonpath(const char *input, char *buf, size_t bufsize) 1619{ 1620 const char *p; 1621 char *q; 1622 1623 /* can't canon relative paths, don't bother */ 1624 if (input[0] != '/') { 1625 if (strlcpy(buf, input, bufsize) >= bufsize) 1626 return ENAMETOOLONG; 1627 return 0; 1628 } 1629 1630 p = input; 1631 q = buf; 1632 while (*p && (q - buf < bufsize)) { 1633 if (p[0] == '/' && (p[1] == '/' || p[1] == '\0')) { 1634 p += 1; 1635 1636 } else if (p[0] == '/' && p[1] == '.' && 1637 (p[2] == '/' || p[2] == '\0')) { 1638 p += 2; 1639 1640 } else if (p[0] == '/' && p[1] == '.' && p[2] == '.' && 1641 (p[3] == '/' || p[3] == '\0')) { 1642 p += 3; 1643 if (q != buf) /* "/../" at start of buf */ 1644 while (*--q != '/') 1645 continue; 1646 1647 } else { 1648 *q++ = *p++; 1649 } 1650 } 1651 if ((*p == '\0') && (q - buf < bufsize)) { 1652 *q = 0; 1653 return 0; 1654 } else 1655 return ENAMETOOLONG; 1656} 1657