1 /* $OpenBSD: kern_pledge.c,v 1.228 2018/01/09 15:14:23 mpi 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/socketvar.h> 29 #include <sys/vnode.h> 30 #include <sys/mbuf.h> 31 #include <sys/mman.h> 32 #include <sys/sysctl.h> 33 #include <sys/syslog.h> 34 #include <sys/ktrace.h> 35 #include <sys/acct.h> 36 37 #include <sys/ioctl.h> 38 #include <sys/termios.h> 39 #include <sys/tty.h> 40 #include <sys/device.h> 41 #include <sys/disklabel.h> 42 #include <sys/dkio.h> 43 #include <sys/mtio.h> 44 #include <sys/audioio.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 "pty.h" 72 73 #if defined(__amd64__) || defined(__i386__) 74 #include "vmm.h" 75 #if NVMM > 0 76 #include <machine/conf.h> 77 #endif 78 #endif 79 80 #if defined(__amd64__) || defined(__i386__) || \ 81 defined(__loongson__) || defined(__macppc__) || \ 82 defined(__sparc64__) 83 #include "drm.h" 84 #endif 85 86 uint64_t pledgereq_flags(const char *req); 87 int parsepledges(struct proc *p, const char *kname, 88 const char *promises, u_int64_t *fp); 89 int canonpath(const char *input, char *buf, size_t bufsize); 90 91 /* #define DEBUG_PLEDGE */ 92 #ifdef DEBUG_PLEDGE 93 int debug_pledge = 1; 94 #define DPRINTF(x...) do { if (debug_pledge) printf(x); } while (0) 95 #define DNPRINTF(n,x...) do { if (debug_pledge >= (n)) printf(x); } while (0) 96 #else 97 #define DPRINTF(x...) 98 #define DNPRINTF(n,x...) 99 #endif 100 101 /* 102 * Ordered in blocks starting with least risky and most required. 103 */ 104 const uint64_t pledge_syscalls[SYS_MAXSYSCALL] = { 105 /* 106 * Minimum required 107 */ 108 [SYS_exit] = PLEDGE_ALWAYS, 109 [SYS_kbind] = PLEDGE_ALWAYS, 110 [SYS___get_tcb] = PLEDGE_ALWAYS, 111 [SYS___set_tcb] = PLEDGE_ALWAYS, 112 [SYS_pledge] = PLEDGE_ALWAYS, 113 [SYS_sendsyslog] = PLEDGE_ALWAYS, /* stack protector reporting */ 114 [SYS_thrkill] = PLEDGE_ALWAYS, /* raise, abort, stack pro */ 115 [SYS_utrace] = PLEDGE_ALWAYS, /* ltrace(1) from ld.so */ 116 117 /* "getting" information about self is considered safe */ 118 [SYS_getuid] = PLEDGE_STDIO, 119 [SYS_geteuid] = PLEDGE_STDIO, 120 [SYS_getresuid] = PLEDGE_STDIO, 121 [SYS_getgid] = PLEDGE_STDIO, 122 [SYS_getegid] = PLEDGE_STDIO, 123 [SYS_getresgid] = PLEDGE_STDIO, 124 [SYS_getgroups] = PLEDGE_STDIO, 125 [SYS_getlogin_r] = PLEDGE_STDIO, 126 [SYS_getpgrp] = PLEDGE_STDIO, 127 [SYS_getpgid] = PLEDGE_STDIO, 128 [SYS_getppid] = PLEDGE_STDIO, 129 [SYS_getsid] = PLEDGE_STDIO, 130 [SYS_getthrid] = PLEDGE_STDIO, 131 [SYS_getrlimit] = PLEDGE_STDIO, 132 [SYS_getrtable] = PLEDGE_STDIO, 133 [SYS_gettimeofday] = PLEDGE_STDIO, 134 [SYS_getdtablecount] = PLEDGE_STDIO, 135 [SYS_getrusage] = PLEDGE_STDIO, 136 [SYS_issetugid] = PLEDGE_STDIO, 137 [SYS_clock_getres] = PLEDGE_STDIO, 138 [SYS_clock_gettime] = PLEDGE_STDIO, 139 [SYS_getpid] = PLEDGE_STDIO, 140 141 /* 142 * Almost exclusively read-only, Very narrow subset. 143 * Use of "route", "inet", "dns", "ps", or "vminfo" 144 * expands access. 145 */ 146 [SYS_sysctl] = PLEDGE_STDIO, 147 148 /* Support for malloc(3) family of operations */ 149 [SYS_getentropy] = PLEDGE_STDIO, 150 [SYS_madvise] = PLEDGE_STDIO, 151 [SYS_minherit] = PLEDGE_STDIO, 152 [SYS_mmap] = PLEDGE_STDIO, 153 [SYS_mprotect] = PLEDGE_STDIO, 154 [SYS_mquery] = PLEDGE_STDIO, 155 [SYS_munmap] = PLEDGE_STDIO, 156 [SYS_msync] = PLEDGE_STDIO, 157 [SYS_break] = PLEDGE_STDIO, 158 159 [SYS_umask] = PLEDGE_STDIO, 160 161 /* read/write operations */ 162 [SYS_read] = PLEDGE_STDIO, 163 [SYS_readv] = PLEDGE_STDIO, 164 [SYS_pread] = PLEDGE_STDIO, 165 [SYS_preadv] = PLEDGE_STDIO, 166 [SYS_write] = PLEDGE_STDIO, 167 [SYS_writev] = PLEDGE_STDIO, 168 [SYS_pwrite] = PLEDGE_STDIO, 169 [SYS_pwritev] = PLEDGE_STDIO, 170 [SYS_recvmsg] = PLEDGE_STDIO, 171 [SYS_recvfrom] = PLEDGE_STDIO | PLEDGE_YPACTIVE, 172 [SYS_ftruncate] = PLEDGE_STDIO, 173 [SYS_lseek] = PLEDGE_STDIO, 174 [SYS_fpathconf] = PLEDGE_STDIO, 175 176 /* 177 * Address selection required a network pledge ("inet", 178 * "unix", "dns". 179 */ 180 [SYS_sendto] = PLEDGE_STDIO | PLEDGE_YPACTIVE, 181 182 /* 183 * Address specification required a network pledge ("inet", 184 * "unix", "dns". SCM_RIGHTS requires "sendfd" or "recvfd". 185 */ 186 [SYS_sendmsg] = PLEDGE_STDIO, 187 188 /* Common signal operations */ 189 [SYS_nanosleep] = PLEDGE_STDIO, 190 [SYS_sigaltstack] = PLEDGE_STDIO, 191 [SYS_sigprocmask] = PLEDGE_STDIO, 192 [SYS_sigsuspend] = PLEDGE_STDIO, 193 [SYS_sigaction] = PLEDGE_STDIO, 194 [SYS_sigreturn] = PLEDGE_STDIO, 195 [SYS_sigpending] = PLEDGE_STDIO, 196 [SYS_getitimer] = PLEDGE_STDIO, 197 [SYS_setitimer] = PLEDGE_STDIO, 198 199 /* 200 * To support event driven programming. 201 */ 202 [SYS_poll] = PLEDGE_STDIO, 203 [SYS_ppoll] = PLEDGE_STDIO, 204 [SYS_kevent] = PLEDGE_STDIO, 205 [SYS_kqueue] = PLEDGE_STDIO, 206 [SYS_select] = PLEDGE_STDIO, 207 [SYS_pselect] = PLEDGE_STDIO, 208 209 [SYS_fstat] = PLEDGE_STDIO, 210 [SYS_fsync] = PLEDGE_STDIO, 211 212 [SYS_setsockopt] = PLEDGE_STDIO, /* narrow whitelist */ 213 [SYS_getsockopt] = PLEDGE_STDIO, /* narrow whitelist */ 214 215 /* F_SETOWN requires PLEDGE_PROC */ 216 [SYS_fcntl] = PLEDGE_STDIO, 217 218 [SYS_close] = PLEDGE_STDIO, 219 [SYS_dup] = PLEDGE_STDIO, 220 [SYS_dup2] = PLEDGE_STDIO, 221 [SYS_dup3] = PLEDGE_STDIO, 222 [SYS_closefrom] = PLEDGE_STDIO, 223 [SYS_shutdown] = PLEDGE_STDIO, 224 [SYS_fchdir] = PLEDGE_STDIO, /* XXX consider tightening */ 225 226 [SYS_pipe] = PLEDGE_STDIO, 227 [SYS_pipe2] = PLEDGE_STDIO, 228 [SYS_socketpair] = PLEDGE_STDIO, 229 230 [SYS_wait4] = PLEDGE_STDIO, 231 232 /* 233 * Can kill self with "stdio". Killing another pid 234 * requires "proc" 235 */ 236 [SYS_kill] = PLEDGE_STDIO, 237 238 /* 239 * FIONREAD/FIONBIO for "stdio" 240 * Other ioctl are selectively allowed based upon other pledges. 241 */ 242 [SYS_ioctl] = PLEDGE_STDIO, 243 244 /* 245 * Path access/creation calls encounter many extensive 246 * checks are done during namei() 247 */ 248 [SYS_open] = PLEDGE_STDIO, 249 [SYS_stat] = PLEDGE_STDIO, 250 [SYS_access] = PLEDGE_STDIO, 251 [SYS_readlink] = PLEDGE_STDIO, 252 253 [SYS_adjtime] = PLEDGE_STDIO, /* setting requires "settime" */ 254 [SYS_adjfreq] = PLEDGE_SETTIME, 255 [SYS_settimeofday] = PLEDGE_SETTIME, 256 257 /* 258 * Needed by threaded programs 259 * XXX should we have a new "threads"? 260 */ 261 [SYS___tfork] = PLEDGE_STDIO, 262 [SYS_sched_yield] = PLEDGE_STDIO, 263 [SYS_futex] = PLEDGE_STDIO, 264 [SYS___thrsleep] = PLEDGE_STDIO, 265 [SYS___thrwakeup] = PLEDGE_STDIO, 266 [SYS___threxit] = PLEDGE_STDIO, 267 [SYS___thrsigdivert] = PLEDGE_STDIO, 268 269 [SYS_fork] = PLEDGE_PROC, 270 [SYS_vfork] = PLEDGE_PROC, 271 [SYS_setpgid] = PLEDGE_PROC, 272 [SYS_setsid] = PLEDGE_PROC, 273 274 [SYS_setrlimit] = PLEDGE_PROC | PLEDGE_ID, 275 [SYS_getpriority] = PLEDGE_PROC | PLEDGE_ID, 276 277 [SYS_setpriority] = PLEDGE_PROC | PLEDGE_ID, 278 279 [SYS_setuid] = PLEDGE_ID, 280 [SYS_seteuid] = PLEDGE_ID, 281 [SYS_setreuid] = PLEDGE_ID, 282 [SYS_setresuid] = PLEDGE_ID, 283 [SYS_setgid] = PLEDGE_ID, 284 [SYS_setegid] = PLEDGE_ID, 285 [SYS_setregid] = PLEDGE_ID, 286 [SYS_setresgid] = PLEDGE_ID, 287 [SYS_setgroups] = PLEDGE_ID, 288 [SYS_setlogin] = PLEDGE_ID, 289 290 [SYS_execve] = PLEDGE_EXEC, 291 292 [SYS_chdir] = PLEDGE_RPATH, 293 [SYS_openat] = PLEDGE_RPATH | PLEDGE_WPATH, 294 [SYS_fstatat] = PLEDGE_RPATH | PLEDGE_WPATH, 295 [SYS_faccessat] = PLEDGE_RPATH | PLEDGE_WPATH, 296 [SYS_readlinkat] = PLEDGE_RPATH | PLEDGE_WPATH, 297 [SYS_lstat] = PLEDGE_RPATH | PLEDGE_WPATH | PLEDGE_TMPPATH, 298 [SYS_truncate] = PLEDGE_WPATH, 299 [SYS_rename] = PLEDGE_RPATH | PLEDGE_CPATH, 300 [SYS_rmdir] = PLEDGE_CPATH, 301 [SYS_renameat] = PLEDGE_CPATH, 302 [SYS_link] = PLEDGE_CPATH, 303 [SYS_linkat] = PLEDGE_CPATH, 304 [SYS_symlink] = PLEDGE_CPATH, 305 [SYS_symlinkat] = PLEDGE_CPATH, 306 [SYS_unlink] = PLEDGE_CPATH | PLEDGE_TMPPATH, 307 [SYS_unlinkat] = PLEDGE_CPATH, 308 [SYS_mkdir] = PLEDGE_CPATH, 309 [SYS_mkdirat] = PLEDGE_CPATH, 310 311 [SYS_mkfifo] = PLEDGE_DPATH, 312 [SYS_mknod] = PLEDGE_DPATH, 313 314 [SYS_revoke] = PLEDGE_TTY, /* also requires PLEDGE_RPATH */ 315 316 /* 317 * Classify as RPATH|WPATH, because of path information leakage. 318 * WPATH due to unknown use of mk*temp(3) on non-/tmp paths.. 319 */ 320 [SYS___getcwd] = PLEDGE_RPATH | PLEDGE_WPATH, 321 322 /* Classify as RPATH, because these leak path information */ 323 [SYS_getdents] = PLEDGE_RPATH, 324 [SYS_getfsstat] = PLEDGE_RPATH, 325 [SYS_statfs] = PLEDGE_RPATH, 326 [SYS_fstatfs] = PLEDGE_RPATH, 327 [SYS_pathconf] = PLEDGE_RPATH, 328 329 [SYS_utimes] = PLEDGE_FATTR, 330 [SYS_futimes] = PLEDGE_FATTR, 331 [SYS_utimensat] = PLEDGE_FATTR, 332 [SYS_futimens] = PLEDGE_FATTR, 333 [SYS_chmod] = PLEDGE_FATTR, 334 [SYS_fchmod] = PLEDGE_FATTR, 335 [SYS_fchmodat] = PLEDGE_FATTR, 336 [SYS_chflags] = PLEDGE_FATTR, 337 [SYS_chflagsat] = PLEDGE_FATTR, 338 [SYS_fchflags] = PLEDGE_FATTR, 339 340 [SYS_chown] = PLEDGE_CHOWN, 341 [SYS_fchownat] = PLEDGE_CHOWN, 342 [SYS_lchown] = PLEDGE_CHOWN, 343 [SYS_fchown] = PLEDGE_CHOWN, 344 345 [SYS_socket] = PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS | PLEDGE_YPACTIVE, 346 [SYS_connect] = PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS | PLEDGE_YPACTIVE, 347 [SYS_bind] = PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS | PLEDGE_YPACTIVE, 348 [SYS_getsockname] = PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS | PLEDGE_YPACTIVE, 349 350 [SYS_listen] = PLEDGE_INET | PLEDGE_UNIX, 351 [SYS_accept4] = PLEDGE_INET | PLEDGE_UNIX, 352 [SYS_accept] = PLEDGE_INET | PLEDGE_UNIX, 353 [SYS_getpeername] = PLEDGE_INET | PLEDGE_UNIX, 354 355 [SYS_flock] = PLEDGE_FLOCK | PLEDGE_YPACTIVE, 356 357 [SYS_swapctl] = PLEDGE_VMINFO, /* XXX should limit to "get" operations */ 358 }; 359 360 static const struct { 361 char *name; 362 uint64_t flags; 363 } pledgereq[] = { 364 { "audio", PLEDGE_AUDIO }, 365 { "bpf", PLEDGE_BPF }, 366 { "chown", PLEDGE_CHOWN | PLEDGE_CHOWNUID }, 367 { "cpath", PLEDGE_CPATH }, 368 { "disklabel", PLEDGE_DISKLABEL }, 369 { "dns", PLEDGE_DNS }, 370 { "dpath", PLEDGE_DPATH }, 371 { "drm", PLEDGE_DRM }, 372 { "error", PLEDGE_ERROR }, 373 { "exec", PLEDGE_EXEC }, 374 { "fattr", PLEDGE_FATTR | PLEDGE_CHOWN }, 375 { "flock", PLEDGE_FLOCK }, 376 { "getpw", PLEDGE_GETPW }, 377 { "id", PLEDGE_ID }, 378 { "inet", PLEDGE_INET }, 379 { "mcast", PLEDGE_MCAST }, 380 { "pf", PLEDGE_PF }, 381 { "proc", PLEDGE_PROC }, 382 { "prot_exec", PLEDGE_PROTEXEC }, 383 { "ps", PLEDGE_PS }, 384 { "recvfd", PLEDGE_RECVFD }, 385 { "route", PLEDGE_ROUTE }, 386 { "rpath", PLEDGE_RPATH }, 387 { "sendfd", PLEDGE_SENDFD }, 388 { "settime", PLEDGE_SETTIME }, 389 { "stdio", PLEDGE_STDIO }, 390 { "tape", PLEDGE_TAPE }, 391 { "tmppath", PLEDGE_TMPPATH }, 392 { "tty", PLEDGE_TTY }, 393 { "unix", PLEDGE_UNIX }, 394 { "vminfo", PLEDGE_VMINFO }, 395 { "vmm", PLEDGE_VMM }, 396 { "wpath", PLEDGE_WPATH }, 397 }; 398 399 int 400 parsepledges(struct proc *p, const char *kname, const char *promises, u_int64_t *fp) 401 { 402 size_t rbuflen; 403 char *rbuf, *rp, *pn; 404 u_int64_t flags = 0, f; 405 int error; 406 407 rbuf = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 408 error = copyinstr(promises, rbuf, MAXPATHLEN, 409 &rbuflen); 410 if (error) { 411 free(rbuf, M_TEMP, MAXPATHLEN); 412 return (error); 413 } 414 #ifdef KTRACE 415 if (KTRPOINT(p, KTR_STRUCT)) 416 ktrstruct(p, kname, rbuf, rbuflen-1); 417 #endif 418 419 for (rp = rbuf; rp && *rp && error == 0; rp = pn) { 420 pn = strchr(rp, ' '); /* find terminator */ 421 if (pn) { 422 while (*pn == ' ') 423 *pn++ = '\0'; 424 } 425 if ((f = pledgereq_flags(rp)) == 0) { 426 free(rbuf, M_TEMP, MAXPATHLEN); 427 return (EINVAL); 428 } 429 flags |= f; 430 } 431 free(rbuf, M_TEMP, MAXPATHLEN); 432 *fp = flags; 433 return 0; 434 } 435 436 int 437 sys_pledge(struct proc *p, void *v, register_t *retval) 438 { 439 struct sys_pledge_args /* { 440 syscallarg(const char *)promises; 441 syscallarg(const char *)execpromises; 442 } */ *uap = v; 443 struct process *pr = p->p_p; 444 uint64_t promises, execpromises; 445 int error; 446 447 if (SCARG(uap, promises)) { 448 error = parsepledges(p, "pledgereq", 449 SCARG(uap, promises), &promises); 450 if (error) 451 return (error); 452 453 /* In "error" mode, ignore promise increase requests, 454 * but accept promise decrease requests */ 455 if (ISSET(pr->ps_flags, PS_PLEDGE) && 456 (pr->ps_pledge & PLEDGE_ERROR)) 457 promises &= (pr->ps_pledge & PLEDGE_USERSET); 458 459 /* Only permit reductions */ 460 if (ISSET(pr->ps_flags, PS_PLEDGE) && 461 (((promises | pr->ps_pledge) != pr->ps_pledge))) 462 return (EPERM); 463 } 464 if (SCARG(uap, execpromises)) { 465 error = parsepledges(p, "pledgeexecreq", 466 SCARG(uap, execpromises), &execpromises); 467 if (error) 468 return (error); 469 470 /* Only permit reductions */ 471 if (ISSET(pr->ps_flags, PS_EXECPLEDGE) && 472 (((execpromises | pr->ps_execpledge) != pr->ps_execpledge))) 473 return (EPERM); 474 } 475 476 if (SCARG(uap, promises)) { 477 pr->ps_pledge = promises; 478 pr->ps_flags |= PS_PLEDGE; 479 } 480 if (SCARG(uap, execpromises)) { 481 pr->ps_execpledge = execpromises; 482 pr->ps_flags |= PS_EXECPLEDGE; 483 } 484 return (0); 485 } 486 487 int 488 pledge_syscall(struct proc *p, int code, uint64_t *tval) 489 { 490 p->p_pledge_syscall = code; 491 *tval = 0; 492 493 if (code < 0 || code > SYS_MAXSYSCALL - 1) 494 return (EINVAL); 495 496 if (pledge_syscalls[code] == PLEDGE_ALWAYS) 497 return (0); 498 499 if (p->p_p->ps_pledge & pledge_syscalls[code]) 500 return (0); 501 502 *tval = pledge_syscalls[code]; 503 return (EPERM); 504 } 505 506 int 507 pledge_fail(struct proc *p, int error, uint64_t code) 508 { 509 char *codes = ""; 510 int i; 511 struct sigaction sa; 512 513 /* Print first matching pledge */ 514 for (i = 0; code && pledgenames[i].bits != 0; i++) 515 if (pledgenames[i].bits & code) { 516 codes = pledgenames[i].name; 517 break; 518 } 519 #ifdef KTRACE 520 if (KTRPOINT(p, KTR_PLEDGE)) 521 ktrpledge(p, error, code, p->p_pledge_syscall); 522 #endif 523 if (p->p_p->ps_pledge & PLEDGE_ERROR) 524 return (ENOSYS); 525 526 log(LOG_ERR, "%s[%d]: pledge \"%s\", syscall %d\n", 527 p->p_p->ps_comm, p->p_p->ps_pid, codes, p->p_pledge_syscall); 528 p->p_p->ps_acflag |= APLEDGE; 529 /* Send uncatchable SIGABRT for coredump */ 530 memset(&sa, 0, sizeof sa); 531 sa.sa_handler = SIG_DFL; 532 setsigvec(p, SIGABRT, &sa); 533 psignal(p, SIGABRT); 534 535 p->p_p->ps_pledge = 0; /* Disable all PLEDGE_ flags */ 536 return (error); 537 } 538 539 /* 540 * Need to make it more obvious that one cannot get through here 541 * without the right flags set 542 */ 543 int 544 pledge_namei(struct proc *p, struct nameidata *ni, char *origpath) 545 { 546 char path[PATH_MAX]; 547 int error; 548 549 if ((p->p_p->ps_flags & PS_PLEDGE) == 0 || 550 (p->p_p->ps_flags & PS_COREDUMP)) 551 return (0); 552 553 if (!ni || (ni->ni_pledge == 0)) 554 panic("ni_pledge"); 555 556 /* Doing a permitted execve() */ 557 if ((ni->ni_pledge & PLEDGE_EXEC) && 558 (p->p_p->ps_pledge & PLEDGE_EXEC)) 559 return (0); 560 561 error = canonpath(origpath, path, sizeof(path)); 562 if (error) 563 return (error); 564 565 /* Detect what looks like a mkstemp(3) family operation */ 566 if ((p->p_p->ps_pledge & PLEDGE_TMPPATH) && 567 (p->p_pledge_syscall == SYS_open) && 568 (ni->ni_pledge & PLEDGE_CPATH) && 569 strncmp(path, "/tmp/", sizeof("/tmp/") - 1) == 0) { 570 return (0); 571 } 572 573 /* Allow unlinking of a mkstemp(3) file... 574 * Good opportunity for strict checks here. 575 */ 576 if ((p->p_p->ps_pledge & PLEDGE_TMPPATH) && 577 (p->p_pledge_syscall == SYS_unlink) && 578 strncmp(path, "/tmp/", sizeof("/tmp/") - 1) == 0) { 579 return (0); 580 } 581 582 /* Whitelisted paths */ 583 switch (p->p_pledge_syscall) { 584 case SYS_access: 585 /* tzset() needs this. */ 586 if ((ni->ni_pledge == PLEDGE_RPATH) && 587 strcmp(path, "/etc/localtime") == 0) 588 return (0); 589 590 /* when avoiding YP mode, getpw* functions touch this */ 591 if (ni->ni_pledge == PLEDGE_RPATH && 592 strcmp(path, "/var/run/ypbind.lock") == 0) { 593 if (p->p_p->ps_pledge & PLEDGE_GETPW) 594 return (0); 595 else 596 return (pledge_fail(p, error, PLEDGE_GETPW)); 597 } 598 break; 599 case SYS_open: 600 /* daemon(3) or other such functions */ 601 if ((ni->ni_pledge & ~(PLEDGE_RPATH | PLEDGE_WPATH)) == 0 && 602 strcmp(path, "/dev/null") == 0) { 603 return (0); 604 } 605 606 /* readpassphrase(3), getpass(3) */ 607 if ((p->p_p->ps_pledge & PLEDGE_TTY) && 608 (ni->ni_pledge & ~(PLEDGE_RPATH | PLEDGE_WPATH)) == 0 && 609 strcmp(path, "/dev/tty") == 0) { 610 return (0); 611 } 612 613 /* getpw* and friends need a few files */ 614 if ((ni->ni_pledge == PLEDGE_RPATH) && 615 (p->p_p->ps_pledge & PLEDGE_GETPW)) { 616 if (strcmp(path, "/etc/spwd.db") == 0) 617 return (EPERM); /* don't call pledge_fail */ 618 if (strcmp(path, "/etc/pwd.db") == 0) 619 return (0); 620 if (strcmp(path, "/etc/group") == 0) 621 return (0); 622 if (strcmp(path, "/etc/netid") == 0) 623 return (0); 624 } 625 626 /* DNS needs /etc/{resolv.conf,hosts,services}. */ 627 if ((ni->ni_pledge == PLEDGE_RPATH) && 628 (p->p_p->ps_pledge & PLEDGE_DNS)) { 629 if (strcmp(path, "/etc/resolv.conf") == 0) 630 return (0); 631 if (strcmp(path, "/etc/hosts") == 0) 632 return (0); 633 if (strcmp(path, "/etc/services") == 0) 634 return (0); 635 } 636 637 if ((ni->ni_pledge == PLEDGE_RPATH) && 638 (p->p_p->ps_pledge & PLEDGE_GETPW)) { 639 if (strcmp(path, "/var/run/ypbind.lock") == 0) { 640 /* 641 * XXX 642 * The current hack for YP support in "getpw" 643 * is to enable some "inet" features until 644 * next pledge call. This is not considered 645 * worse than pre-pledge, but is a work in 646 * progress, needing a clever design. 647 */ 648 p->p_p->ps_pledge |= PLEDGE_YPACTIVE; 649 return (0); 650 } 651 if (strncmp(path, "/var/yp/binding/", 652 sizeof("/var/yp/binding/") - 1) == 0) 653 return (0); 654 } 655 656 /* tzset() needs these. */ 657 if ((ni->ni_pledge == PLEDGE_RPATH) && 658 strncmp(path, "/usr/share/zoneinfo/", 659 sizeof("/usr/share/zoneinfo/") - 1) == 0) 660 return (0); 661 if ((ni->ni_pledge == PLEDGE_RPATH) && 662 strcmp(path, "/etc/localtime") == 0) 663 return (0); 664 665 break; 666 case SYS_readlink: 667 /* Allow /etc/malloc.conf for malloc(3). */ 668 if ((ni->ni_pledge == PLEDGE_RPATH) && 669 strcmp(path, "/etc/malloc.conf") == 0) 670 return (0); 671 break; 672 case SYS_stat: 673 /* DNS needs /etc/resolv.conf. */ 674 if ((ni->ni_pledge == PLEDGE_RPATH) && 675 (p->p_p->ps_pledge & PLEDGE_DNS) && 676 strcmp(path, "/etc/resolv.conf") == 0) 677 return (0); 678 break; 679 } 680 681 /* 682 * Ensure each flag of p_pledgenote has counterpart allowing it in 683 * ps_pledge 684 */ 685 if (ni->ni_pledge & ~p->p_p->ps_pledge) 686 return (pledge_fail(p, EPERM, (ni->ni_pledge & ~p->p_p->ps_pledge))); 687 688 return (0); 689 } 690 691 /* 692 * Only allow reception of safe file descriptors. 693 */ 694 int 695 pledge_recvfd(struct proc *p, struct file *fp) 696 { 697 struct vnode *vp; 698 699 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 700 return (0); 701 if ((p->p_p->ps_pledge & PLEDGE_RECVFD) == 0) 702 return pledge_fail(p, EPERM, PLEDGE_RECVFD); 703 704 switch (fp->f_type) { 705 case DTYPE_SOCKET: 706 case DTYPE_PIPE: 707 return (0); 708 case DTYPE_VNODE: 709 vp = fp->f_data; 710 711 if (vp->v_type != VDIR) 712 return (0); 713 break; 714 } 715 return pledge_fail(p, EINVAL, PLEDGE_RECVFD); 716 } 717 718 /* 719 * Only allow sending of safe file descriptors. 720 */ 721 int 722 pledge_sendfd(struct proc *p, struct file *fp) 723 { 724 struct vnode *vp; 725 726 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 727 return (0); 728 if ((p->p_p->ps_pledge & PLEDGE_SENDFD) == 0) 729 return pledge_fail(p, EPERM, PLEDGE_SENDFD); 730 731 switch (fp->f_type) { 732 case DTYPE_SOCKET: 733 case DTYPE_PIPE: 734 return (0); 735 case DTYPE_VNODE: 736 vp = fp->f_data; 737 738 if (vp->v_type != VDIR) 739 return (0); 740 break; 741 } 742 return pledge_fail(p, EINVAL, PLEDGE_SENDFD); 743 } 744 745 int 746 pledge_sysctl(struct proc *p, int miblen, int *mib, void *new) 747 { 748 char buf[80]; 749 int i; 750 751 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 752 return (0); 753 754 if (new) 755 return pledge_fail(p, EFAULT, 0); 756 757 /* routing table observation */ 758 if ((p->p_p->ps_pledge & PLEDGE_ROUTE)) { 759 if ((miblen == 6 || miblen == 7) && 760 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 761 mib[2] == 0 && 762 mib[4] == NET_RT_DUMP) 763 return (0); 764 765 if (miblen == 6 && 766 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 767 mib[2] == 0 && 768 (mib[3] == 0 || mib[3] == AF_INET6 || mib[3] == AF_INET) && 769 mib[4] == NET_RT_TABLE) 770 return (0); 771 772 if (miblen == 7 && /* exposes MACs */ 773 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 774 mib[2] == 0 && 775 (mib[3] == 0 || mib[3] == AF_INET6 || mib[3] == AF_INET) && 776 mib[4] == NET_RT_FLAGS && mib[5] == RTF_LLINFO) 777 return (0); 778 } 779 780 if (p->p_p->ps_pledge & (PLEDGE_PS | PLEDGE_VMINFO)) { 781 if (miblen == 2 && /* kern.fscale */ 782 mib[0] == CTL_KERN && mib[1] == KERN_FSCALE) 783 return (0); 784 if (miblen == 2 && /* kern.boottime */ 785 mib[0] == CTL_KERN && mib[1] == KERN_BOOTTIME) 786 return (0); 787 if (miblen == 2 && /* kern.consdev */ 788 mib[0] == CTL_KERN && mib[1] == KERN_CONSDEV) 789 return (0); 790 if (miblen == 2 && /* kern.cptime */ 791 mib[0] == CTL_KERN && mib[1] == KERN_CPTIME) 792 return (0); 793 if (miblen == 3 && /* kern.cptime2 */ 794 mib[0] == CTL_KERN && mib[1] == KERN_CPTIME2) 795 return (0); 796 } 797 798 if ((p->p_p->ps_pledge & PLEDGE_PS)) { 799 if (miblen == 4 && /* kern.procargs.* */ 800 mib[0] == CTL_KERN && mib[1] == KERN_PROC_ARGS && 801 (mib[3] == KERN_PROC_ARGV || mib[3] == KERN_PROC_ENV)) 802 return (0); 803 if (miblen == 6 && /* kern.proc.* */ 804 mib[0] == CTL_KERN && mib[1] == KERN_PROC) 805 return (0); 806 if (miblen == 3 && /* kern.proc_cwd.* */ 807 mib[0] == CTL_KERN && mib[1] == KERN_PROC_CWD) 808 return (0); 809 if (miblen == 2 && /* hw.physmem */ 810 mib[0] == CTL_HW && mib[1] == HW_PHYSMEM64) 811 return (0); 812 if (miblen == 2 && /* kern.ccpu */ 813 mib[0] == CTL_KERN && mib[1] == KERN_CCPU) 814 return (0); 815 if (miblen == 2 && /* vm.maxslp */ 816 mib[0] == CTL_VM && mib[1] == VM_MAXSLP) 817 return (0); 818 } 819 820 if ((p->p_p->ps_pledge & PLEDGE_VMINFO)) { 821 if (miblen == 2 && /* vm.uvmexp */ 822 mib[0] == CTL_VM && mib[1] == VM_UVMEXP) 823 return (0); 824 if (miblen == 3 && /* vfs.generic.bcachestat */ 825 mib[0] == CTL_VFS && mib[1] == VFS_GENERIC && 826 mib[2] == VFS_BCACHESTAT) 827 return (0); 828 } 829 830 if ((p->p_p->ps_pledge & (PLEDGE_ROUTE | PLEDGE_INET | PLEDGE_DNS))) { 831 if (miblen == 6 && /* getifaddrs() */ 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_IFLIST) 836 return (0); 837 } 838 839 if ((p->p_p->ps_pledge & PLEDGE_DISKLABEL)) { 840 if (miblen == 2 && /* kern.rawpartition */ 841 mib[0] == CTL_KERN && 842 mib[1] == KERN_RAWPARTITION) 843 return (0); 844 if (miblen == 2 && /* kern.maxpartitions */ 845 mib[0] == CTL_KERN && 846 mib[1] == KERN_MAXPARTITIONS) 847 return (0); 848 #ifdef CPU_CHR2BLK 849 if (miblen == 3 && /* machdep.chr2blk */ 850 mib[0] == CTL_MACHDEP && 851 mib[1] == CPU_CHR2BLK) 852 return (0); 853 #endif /* CPU_CHR2BLK */ 854 } 855 856 if (miblen >= 3 && /* ntpd(8) to read sensors */ 857 mib[0] == CTL_HW && mib[1] == HW_SENSORS) 858 return (0); 859 860 if (miblen == 2 && /* getdomainname() */ 861 mib[0] == CTL_KERN && mib[1] == KERN_DOMAINNAME) 862 return (0); 863 if (miblen == 2 && /* gethostname() */ 864 mib[0] == CTL_KERN && mib[1] == KERN_HOSTNAME) 865 return (0); 866 if (miblen == 6 && /* if_nameindex() */ 867 mib[0] == CTL_NET && mib[1] == PF_ROUTE && 868 mib[2] == 0 && mib[3] == 0 && mib[4] == NET_RT_IFNAMES) 869 return (0); 870 if (miblen == 2 && /* uname() */ 871 mib[0] == CTL_KERN && mib[1] == KERN_OSTYPE) 872 return (0); 873 if (miblen == 2 && /* uname() */ 874 mib[0] == CTL_KERN && mib[1] == KERN_OSRELEASE) 875 return (0); 876 if (miblen == 2 && /* uname() */ 877 mib[0] == CTL_KERN && mib[1] == KERN_OSVERSION) 878 return (0); 879 if (miblen == 2 && /* uname() */ 880 mib[0] == CTL_KERN && mib[1] == KERN_VERSION) 881 return (0); 882 if (miblen == 2 && /* kern.clockrate */ 883 mib[0] == CTL_KERN && mib[1] == KERN_CLOCKRATE) 884 return (0); 885 if (miblen == 2 && /* kern.argmax */ 886 mib[0] == CTL_KERN && mib[1] == KERN_ARGMAX) 887 return (0); 888 if (miblen == 2 && /* kern.ngroups */ 889 mib[0] == CTL_KERN && mib[1] == KERN_NGROUPS) 890 return (0); 891 if (miblen == 2 && /* kern.sysvshm */ 892 mib[0] == CTL_KERN && mib[1] == KERN_SYSVSHM) 893 return (0); 894 if (miblen == 2 && /* kern.posix1version */ 895 mib[0] == CTL_KERN && mib[1] == KERN_POSIX1) 896 return (0); 897 if (miblen == 2 && /* uname() */ 898 mib[0] == CTL_HW && mib[1] == HW_MACHINE) 899 return (0); 900 if (miblen == 2 && /* getpagesize() */ 901 mib[0] == CTL_HW && mib[1] == HW_PAGESIZE) 902 return (0); 903 if (miblen == 2 && /* setproctitle() */ 904 mib[0] == CTL_VM && mib[1] == VM_PSSTRINGS) 905 return (0); 906 if (miblen == 2 && /* hw.ncpu */ 907 mib[0] == CTL_HW && mib[1] == HW_NCPU) 908 return (0); 909 if (miblen == 2 && /* vm.loadavg / getloadavg(3) */ 910 mib[0] == CTL_VM && mib[1] == VM_LOADAVG) 911 return (0); 912 913 snprintf(buf, sizeof(buf), "%s(%d): pledge sysctl %d:", 914 p->p_p->ps_comm, p->p_p->ps_pid, miblen); 915 for (i = 0; i < miblen; i++) { 916 char *p = buf + strlen(buf); 917 snprintf(p, sizeof(buf) - (p - buf), " %d", mib[i]); 918 } 919 log(LOG_ERR, "%s\n", buf); 920 921 return pledge_fail(p, EINVAL, 0); 922 } 923 924 int 925 pledge_chown(struct proc *p, uid_t uid, gid_t gid) 926 { 927 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 928 return (0); 929 930 if (p->p_p->ps_pledge & PLEDGE_CHOWNUID) 931 return (0); 932 933 if (uid != -1 && uid != p->p_ucred->cr_uid) 934 return (EPERM); 935 if (gid != -1 && !groupmember(gid, p->p_ucred)) 936 return (EPERM); 937 return (0); 938 } 939 940 int 941 pledge_adjtime(struct proc *p, const void *v) 942 { 943 const struct timeval *delta = v; 944 945 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 946 return (0); 947 948 if ((p->p_p->ps_pledge & PLEDGE_SETTIME)) 949 return (0); 950 if (delta) 951 return (EPERM); 952 return (0); 953 } 954 955 int 956 pledge_sendit(struct proc *p, const void *to) 957 { 958 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 959 return (0); 960 961 if ((p->p_p->ps_pledge & (PLEDGE_INET | PLEDGE_UNIX | PLEDGE_DNS | PLEDGE_YPACTIVE))) 962 return (0); /* may use address */ 963 if (to == NULL) 964 return (0); /* behaves just like write */ 965 return pledge_fail(p, EPERM, PLEDGE_INET); 966 } 967 968 int 969 pledge_ioctl(struct proc *p, long com, struct file *fp) 970 { 971 struct vnode *vp = NULL; 972 int error = EPERM; 973 974 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 975 return (0); 976 977 /* 978 * The ioctl's which are always allowed. 979 */ 980 switch (com) { 981 case FIONREAD: 982 case FIONBIO: 983 case FIOCLEX: 984 case FIONCLEX: 985 return (0); 986 } 987 988 /* fp != NULL was already checked */ 989 if (fp->f_type == DTYPE_VNODE) { 990 vp = fp->f_data; 991 if (vp->v_type == VBAD) 992 return (ENOTTY); 993 } 994 995 if ((p->p_p->ps_pledge & PLEDGE_INET)) { 996 switch (com) { 997 case SIOCATMARK: 998 case SIOCGIFGROUP: 999 if (fp->f_type == DTYPE_SOCKET) 1000 return (0); 1001 break; 1002 } 1003 } 1004 1005 #if NBPFILTER > 0 1006 if ((p->p_p->ps_pledge & PLEDGE_BPF)) { 1007 switch (com) { 1008 case BIOCGSTATS: /* bpf: tcpdump privsep on ^C */ 1009 if (fp->f_type == DTYPE_VNODE && 1010 fp->f_ops->fo_ioctl == vn_ioctl && 1011 vp->v_type == VCHR && 1012 cdevsw[major(vp->v_rdev)].d_open == bpfopen) 1013 return (0); 1014 break; 1015 } 1016 } 1017 #endif /* NBPFILTER > 0 */ 1018 1019 if ((p->p_p->ps_pledge & PLEDGE_TAPE)) { 1020 switch (com) { 1021 case MTIOCGET: 1022 case MTIOCTOP: 1023 /* for pax(1) and such, checking tapes... */ 1024 if (fp->f_type == DTYPE_VNODE && 1025 vp->v_type == VCHR) { 1026 if (vp->v_flag & VISTTY) 1027 return (ENOTTY); 1028 else 1029 return (0); 1030 } 1031 break; 1032 } 1033 } 1034 1035 #if NDRM > 0 1036 if ((p->p_p->ps_pledge & PLEDGE_DRM)) { 1037 if ((fp->f_type == DTYPE_VNODE) && 1038 (vp->v_type == VCHR) && 1039 (cdevsw[major(vp->v_rdev)].d_open == drmopen)) { 1040 error = pledge_ioctl_drm(p, com, vp->v_rdev); 1041 if (error == 0) 1042 return 0; 1043 } 1044 } 1045 #endif /* NDRM > 0 */ 1046 1047 #if NAUDIO > 0 1048 if ((p->p_p->ps_pledge & PLEDGE_AUDIO)) { 1049 switch (com) { 1050 case AUDIO_GETPOS: 1051 case AUDIO_GETPAR: 1052 case AUDIO_SETPAR: 1053 case AUDIO_START: 1054 case AUDIO_STOP: 1055 if (fp->f_type == DTYPE_VNODE && 1056 vp->v_type == VCHR && 1057 cdevsw[major(vp->v_rdev)].d_open == audioopen) 1058 return (0); 1059 } 1060 } 1061 #endif /* NAUDIO > 0 */ 1062 1063 if ((p->p_p->ps_pledge & PLEDGE_DISKLABEL)) { 1064 switch (com) { 1065 case DIOCGDINFO: 1066 case DIOCGPDINFO: 1067 case DIOCRLDINFO: 1068 case DIOCWDINFO: 1069 case BIOCDISK: 1070 case BIOCINQ: 1071 case BIOCINSTALLBOOT: 1072 case BIOCVOL: 1073 if (fp->f_type == DTYPE_VNODE && 1074 ((vp->v_type == VCHR && 1075 cdevsw[major(vp->v_rdev)].d_type == D_DISK) || 1076 (vp->v_type == VBLK && 1077 bdevsw[major(vp->v_rdev)].d_type == D_DISK))) 1078 return (0); 1079 break; 1080 case DIOCMAP: 1081 if (fp->f_type == DTYPE_VNODE && 1082 vp->v_type == VCHR && 1083 cdevsw[major(vp->v_rdev)].d_ioctl == diskmapioctl) 1084 return (0); 1085 break; 1086 } 1087 } 1088 1089 #if NPF > 0 1090 if ((p->p_p->ps_pledge & PLEDGE_PF)) { 1091 switch (com) { 1092 case DIOCADDRULE: 1093 case DIOCGETSTATUS: 1094 case DIOCNATLOOK: 1095 case DIOCRADDTABLES: 1096 case DIOCRCLRADDRS: 1097 case DIOCRCLRTABLES: 1098 case DIOCRCLRTSTATS: 1099 case DIOCRGETTSTATS: 1100 case DIOCRSETADDRS: 1101 case DIOCXBEGIN: 1102 case DIOCXCOMMIT: 1103 case DIOCKILLSRCNODES: 1104 if ((fp->f_type == DTYPE_VNODE) && 1105 (vp->v_type == VCHR) && 1106 (cdevsw[major(vp->v_rdev)].d_open == pfopen)) 1107 return (0); 1108 break; 1109 } 1110 } 1111 #endif 1112 1113 if ((p->p_p->ps_pledge & PLEDGE_TTY)) { 1114 switch (com) { 1115 #if NPTY > 0 1116 case PTMGET: 1117 if ((p->p_p->ps_pledge & PLEDGE_RPATH) == 0) 1118 break; 1119 if ((p->p_p->ps_pledge & PLEDGE_WPATH) == 0) 1120 break; 1121 if (fp->f_type != DTYPE_VNODE || vp->v_type != VCHR) 1122 break; 1123 if (cdevsw[major(vp->v_rdev)].d_open != ptmopen) 1124 break; 1125 return (0); 1126 case TIOCUCNTL: /* vmd */ 1127 if ((p->p_p->ps_pledge & PLEDGE_RPATH) == 0) 1128 break; 1129 if ((p->p_p->ps_pledge & PLEDGE_WPATH) == 0) 1130 break; 1131 if (cdevsw[major(vp->v_rdev)].d_open != ptcopen) 1132 break; 1133 return (0); 1134 #endif /* NPTY > 0 */ 1135 case TIOCSPGRP: 1136 if ((p->p_p->ps_pledge & PLEDGE_PROC) == 0) 1137 break; 1138 /* FALLTHROUGH */ 1139 case TIOCFLUSH: /* getty, telnet */ 1140 case TIOCSTART: /* emacs, etc */ 1141 case TIOCGPGRP: 1142 case TIOCGETA: 1143 case TIOCGWINSZ: /* ENOTTY return for non-tty */ 1144 case TIOCSTAT: /* csh */ 1145 if (fp->f_type == DTYPE_VNODE && (vp->v_flag & VISTTY)) 1146 return (0); 1147 return (ENOTTY); 1148 case TIOCSWINSZ: 1149 case TIOCEXT: /* mail, libedit .. */ 1150 case TIOCCBRK: /* cu */ 1151 case TIOCSBRK: /* cu */ 1152 case TIOCCDTR: /* cu */ 1153 case TIOCSDTR: /* cu */ 1154 case TIOCEXCL: /* cu */ 1155 case TIOCSETA: /* cu, ... */ 1156 case TIOCSETAW: /* cu, ... */ 1157 case TIOCSETAF: /* tcsetattr TCSAFLUSH, script */ 1158 case TIOCSCTTY: /* forkpty(3), login_tty(3), ... */ 1159 if (fp->f_type == DTYPE_VNODE && (vp->v_flag & VISTTY)) 1160 return (0); 1161 break; 1162 } 1163 } 1164 1165 if ((p->p_p->ps_pledge & PLEDGE_ROUTE)) { 1166 switch (com) { 1167 case SIOCGIFADDR: 1168 case SIOCGIFAFLAG_IN6: 1169 case SIOCGIFALIFETIME_IN6: 1170 case SIOCGIFDESCR: 1171 case SIOCGIFFLAGS: 1172 case SIOCGIFMETRIC: 1173 case SIOCGIFGMEMB: 1174 case SIOCGIFRDOMAIN: 1175 case SIOCGIFDSTADDR_IN6: 1176 case SIOCGIFNETMASK_IN6: 1177 case SIOCGIFXFLAGS: 1178 case SIOCGNBRINFO_IN6: 1179 case SIOCGIFINFO_IN6: 1180 case SIOCGIFMEDIA: 1181 if (fp->f_type == DTYPE_SOCKET) 1182 return (0); 1183 break; 1184 } 1185 } 1186 1187 #if NVMM > 0 1188 if ((p->p_p->ps_pledge & PLEDGE_VMM)) { 1189 if ((fp->f_type == DTYPE_VNODE) && 1190 (vp->v_type == VCHR) && 1191 (cdevsw[major(vp->v_rdev)].d_open == vmmopen)) { 1192 error = pledge_ioctl_vmm(p, com); 1193 if (error == 0) 1194 return 0; 1195 } 1196 } 1197 #endif 1198 1199 return pledge_fail(p, error, PLEDGE_TTY); 1200 } 1201 1202 int 1203 pledge_sockopt(struct proc *p, int set, int level, int optname) 1204 { 1205 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1206 return (0); 1207 1208 /* Always allow these, which are too common to reject */ 1209 switch (level) { 1210 case SOL_SOCKET: 1211 switch (optname) { 1212 case SO_RCVBUF: 1213 case SO_ERROR: 1214 return 0; 1215 } 1216 break; 1217 } 1218 1219 if ((p->p_p->ps_pledge & (PLEDGE_INET|PLEDGE_UNIX|PLEDGE_DNS|PLEDGE_YPACTIVE)) == 0) 1220 return pledge_fail(p, EPERM, PLEDGE_INET); 1221 /* In use by some service libraries */ 1222 switch (level) { 1223 case SOL_SOCKET: 1224 switch (optname) { 1225 case SO_TIMESTAMP: 1226 return 0; 1227 } 1228 break; 1229 } 1230 1231 /* DNS resolver may do these requests */ 1232 if ((p->p_p->ps_pledge & PLEDGE_DNS)) { 1233 switch (level) { 1234 case IPPROTO_IPV6: 1235 switch (optname) { 1236 case IPV6_RECVPKTINFO: 1237 case IPV6_USE_MIN_MTU: 1238 return (0); 1239 } 1240 } 1241 } 1242 1243 /* YP may do these requests */ 1244 if (p->p_p->ps_pledge & PLEDGE_YPACTIVE) { 1245 switch (level) { 1246 case IPPROTO_IP: 1247 switch (optname) { 1248 case IP_PORTRANGE: 1249 return (0); 1250 } 1251 break; 1252 1253 case IPPROTO_IPV6: 1254 switch (optname) { 1255 case IPV6_PORTRANGE: 1256 return (0); 1257 } 1258 break; 1259 } 1260 } 1261 1262 if ((p->p_p->ps_pledge & (PLEDGE_INET|PLEDGE_UNIX)) == 0) 1263 return pledge_fail(p, EPERM, PLEDGE_INET); 1264 switch (level) { 1265 case SOL_SOCKET: 1266 switch (optname) { 1267 case SO_RTABLE: 1268 return pledge_fail(p, EINVAL, PLEDGE_INET); 1269 } 1270 return (0); 1271 } 1272 1273 if ((p->p_p->ps_pledge & PLEDGE_INET) == 0) 1274 return pledge_fail(p, EPERM, PLEDGE_INET); 1275 switch (level) { 1276 case IPPROTO_TCP: 1277 switch (optname) { 1278 case TCP_NODELAY: 1279 case TCP_MD5SIG: 1280 case TCP_SACK_ENABLE: 1281 case TCP_MAXSEG: 1282 case TCP_NOPUSH: 1283 return (0); 1284 } 1285 break; 1286 case IPPROTO_IP: 1287 switch (optname) { 1288 case IP_OPTIONS: 1289 if (!set) 1290 return (0); 1291 break; 1292 case IP_TOS: 1293 case IP_TTL: 1294 case IP_MINTTL: 1295 case IP_IPDEFTTL: 1296 case IP_PORTRANGE: 1297 case IP_RECVDSTADDR: 1298 case IP_RECVDSTPORT: 1299 return (0); 1300 case IP_MULTICAST_IF: 1301 case IP_MULTICAST_TTL: 1302 case IP_MULTICAST_LOOP: 1303 case IP_ADD_MEMBERSHIP: 1304 case IP_DROP_MEMBERSHIP: 1305 if (p->p_p->ps_pledge & PLEDGE_MCAST) 1306 return (0); 1307 break; 1308 } 1309 break; 1310 case IPPROTO_ICMP: 1311 break; 1312 case IPPROTO_IPV6: 1313 switch (optname) { 1314 case IPV6_TCLASS: 1315 case IPV6_UNICAST_HOPS: 1316 case IPV6_MINHOPCOUNT: 1317 case IPV6_RECVHOPLIMIT: 1318 case IPV6_PORTRANGE: 1319 case IPV6_RECVPKTINFO: 1320 case IPV6_RECVDSTPORT: 1321 case IPV6_V6ONLY: 1322 return (0); 1323 case IPV6_MULTICAST_IF: 1324 case IPV6_MULTICAST_HOPS: 1325 case IPV6_MULTICAST_LOOP: 1326 case IPV6_JOIN_GROUP: 1327 case IPV6_LEAVE_GROUP: 1328 if (p->p_p->ps_pledge & PLEDGE_MCAST) 1329 return (0); 1330 break; 1331 } 1332 break; 1333 case IPPROTO_ICMPV6: 1334 break; 1335 } 1336 return pledge_fail(p, EPERM, PLEDGE_INET); 1337 } 1338 1339 int 1340 pledge_socket(struct proc *p, int domain, unsigned int state) 1341 { 1342 if (! ISSET(p->p_p->ps_flags, PS_PLEDGE)) 1343 return 0; 1344 1345 if (ISSET(state, SS_DNS)) { 1346 if (ISSET(p->p_p->ps_pledge, PLEDGE_DNS)) 1347 return 0; 1348 return pledge_fail(p, EPERM, PLEDGE_DNS); 1349 } 1350 1351 switch (domain) { 1352 case -1: /* accept on any domain */ 1353 return (0); 1354 case AF_INET: 1355 case AF_INET6: 1356 if (ISSET(p->p_p->ps_pledge, PLEDGE_INET) || 1357 ISSET(p->p_p->ps_pledge, PLEDGE_YPACTIVE)) 1358 return 0; 1359 return pledge_fail(p, EPERM, PLEDGE_INET); 1360 1361 case AF_UNIX: 1362 if (ISSET(p->p_p->ps_pledge, PLEDGE_UNIX)) 1363 return 0; 1364 return pledge_fail(p, EPERM, PLEDGE_UNIX); 1365 } 1366 1367 return pledge_fail(p, EINVAL, PLEDGE_INET); 1368 } 1369 1370 int 1371 pledge_flock(struct proc *p) 1372 { 1373 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1374 return (0); 1375 1376 if ((p->p_p->ps_pledge & PLEDGE_FLOCK)) 1377 return (0); 1378 return (pledge_fail(p, EPERM, PLEDGE_FLOCK)); 1379 } 1380 1381 int 1382 pledge_swapctl(struct proc *p) 1383 { 1384 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1385 return (0); 1386 return (EPERM); 1387 } 1388 1389 /* bsearch over pledgereq. return flags value if found, 0 else */ 1390 uint64_t 1391 pledgereq_flags(const char *req_name) 1392 { 1393 int base = 0, cmp, i, lim; 1394 1395 for (lim = nitems(pledgereq); lim != 0; lim >>= 1) { 1396 i = base + (lim >> 1); 1397 cmp = strcmp(req_name, pledgereq[i].name); 1398 if (cmp == 0) 1399 return (pledgereq[i].flags); 1400 if (cmp > 0) { /* not found before, move right */ 1401 base = i + 1; 1402 lim--; 1403 } /* else move left */ 1404 } 1405 return (0); 1406 } 1407 1408 int 1409 pledge_fcntl(struct proc *p, int cmd) 1410 { 1411 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1412 return (0); 1413 if ((p->p_p->ps_pledge & PLEDGE_PROC) == 0 && cmd == F_SETOWN) 1414 return pledge_fail(p, EPERM, PLEDGE_PROC); 1415 return (0); 1416 } 1417 1418 int 1419 pledge_kill(struct proc *p, pid_t pid) 1420 { 1421 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1422 return 0; 1423 if (p->p_p->ps_pledge & PLEDGE_PROC) 1424 return 0; 1425 if (pid == 0 || pid == p->p_p->ps_pid) 1426 return 0; 1427 return pledge_fail(p, EPERM, PLEDGE_PROC); 1428 } 1429 1430 int 1431 pledge_protexec(struct proc *p, int prot) 1432 { 1433 if ((p->p_p->ps_flags & PS_PLEDGE) == 0) 1434 return 0; 1435 /* Before kbind(2) call, ld.so and crt may create EXEC mappings */ 1436 if (p->p_p->ps_kbind_addr == 0 && p->p_p->ps_kbind_cookie == 0) 1437 return 0; 1438 if (!(p->p_p->ps_pledge & PLEDGE_PROTEXEC) && (prot & PROT_EXEC)) 1439 return pledge_fail(p, EPERM, PLEDGE_PROTEXEC); 1440 return 0; 1441 } 1442 1443 int 1444 canonpath(const char *input, char *buf, size_t bufsize) 1445 { 1446 const char *p; 1447 char *q; 1448 1449 /* can't canon relative paths, don't bother */ 1450 if (input[0] != '/') { 1451 if (strlcpy(buf, input, bufsize) >= bufsize) 1452 return ENAMETOOLONG; 1453 return 0; 1454 } 1455 1456 p = input; 1457 q = buf; 1458 while (*p && (q - buf < bufsize)) { 1459 if (p[0] == '/' && (p[1] == '/' || p[1] == '\0')) { 1460 p += 1; 1461 1462 } else if (p[0] == '/' && p[1] == '.' && 1463 (p[2] == '/' || p[2] == '\0')) { 1464 p += 2; 1465 1466 } else if (p[0] == '/' && p[1] == '.' && p[2] == '.' && 1467 (p[3] == '/' || p[3] == '\0')) { 1468 p += 3; 1469 if (q != buf) /* "/../" at start of buf */ 1470 while (*--q != '/') 1471 continue; 1472 1473 } else { 1474 *q++ = *p++; 1475 } 1476 } 1477 if ((*p == '\0') && (q - buf < bufsize)) { 1478 *q = 0; 1479 return 0; 1480 } else 1481 return ENAMETOOLONG; 1482 } 1483