mirror of
https://github.com/jart/cosmopolitan.git
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6f7d0cb1c3
This makes breaking changes to add underscores to many non-standard function names provided by the c library. MODE=tiny is now tinier and we now use smaller locks that are better for tiny apps in this mode. Some headers have been renamed to be in the same folder as the build package, so it'll be easier to know which build dependency is needed. Certain old misguided interfaces have been removed. Intel intrinsics headers are now listed in libc/isystem (but not in the amalgamation) to help further improve open source compatibility. Header complexity has also been reduced. Lastly, more shell scripts are now available.
129 lines
5.6 KiB
C
129 lines
5.6 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/syscall_support-nt.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/fmt/fmt.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/intrin/weaken.h"
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#include "libc/mem/mem.h"
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#include "libc/nt/enum/accessmask.h"
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#include "libc/nt/enum/securityimpersonationlevel.h"
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#include "libc/nt/enum/securityinformation.h"
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#include "libc/nt/errors.h"
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#include "libc/nt/files.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/struct/genericmapping.h"
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#include "libc/nt/struct/privilegeset.h"
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#include "libc/nt/struct/securitydescriptor.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sock/internal.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/ok.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Asks Microsoft if we're authorized to use a folder or file.
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*
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* Implementation Details: MSDN documentation imposes no limit on the
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* internal size of SECURITY_DESCRIPTOR, which we are responsible for
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* allocating. We've selected 1024 which shall hopefully be adequate.
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*
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* @param flags can have R_OK, W_OK, X_OK, etc.
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* @return 0 if authorized, or -1 w/ errno
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* @kudos Aaron Ballman for teaching this
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* @see libc/sysv/consts.sh
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*/
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textwindows int ntaccesscheck(const char16_t *pathname, uint32_t flags) {
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int rc, e;
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void *freeme;
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bool32 result;
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struct NtSecurityDescriptor *s;
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struct NtGenericMapping mapping;
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struct NtPrivilegeSet privileges;
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int64_t hToken, hImpersonatedToken;
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uint32_t secsize, granted, privsize;
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intptr_t buffer[1024 / sizeof(intptr_t)];
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freeme = 0;
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granted = 0;
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result = false;
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s = (void *)buffer;
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secsize = sizeof(buffer);
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privsize = sizeof(privileges);
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bzero(&privileges, sizeof(privileges));
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mapping.GenericRead = kNtFileGenericRead;
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mapping.GenericWrite = kNtFileGenericWrite;
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mapping.GenericExecute = kNtFileGenericExecute;
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mapping.GenericAll = kNtFileAllAccess;
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MapGenericMask(&flags, &mapping);
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hImpersonatedToken = hToken = -1;
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TryAgain:
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if (GetFileSecurity(pathname,
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kNtOwnerSecurityInformation |
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kNtGroupSecurityInformation |
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kNtDaclSecurityInformation,
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s, secsize, &secsize)) {
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if (OpenProcessToken(GetCurrentProcess(),
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kNtTokenImpersonate | kNtTokenQuery |
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kNtTokenDuplicate | kNtStandardRightsRead,
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&hToken)) {
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if (DuplicateToken(hToken, kNtSecurityImpersonation,
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&hImpersonatedToken)) {
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if (AccessCheck(s, hImpersonatedToken, flags, &mapping, &privileges,
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&privsize, &granted, &result)) {
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if (result || flags == F_OK) {
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rc = 0;
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} else {
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STRACE("ntaccesscheck finale failed %d %d", result, flags);
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rc = eacces();
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}
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} else {
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rc = __winerr();
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STRACE("%s(%#hs) failed: %m", "AccessCheck", pathname);
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}
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} else {
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rc = __winerr();
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STRACE("%s(%#hs) failed: %m", "DuplicateToken", pathname);
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}
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} else {
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rc = __winerr();
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STRACE("%s(%#hs) failed: %m", "OpenProcessToken", pathname);
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}
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} else {
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e = GetLastError();
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if (!IsTiny() && e == kNtErrorInsufficientBuffer) {
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if (!freeme && _weaken(malloc) && (freeme = _weaken(malloc)(secsize))) {
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s = freeme;
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goto TryAgain;
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} else {
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rc = enomem();
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STRACE("%s(%#hs) failed: %m", "GetFileSecurity", pathname);
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}
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} else {
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errno = e;
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STRACE("%s(%#hs) failed: %m", "GetFileSecurity", pathname);
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rc = -1;
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}
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}
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if (freeme && _weaken(free)) _weaken(free)(freeme);
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if (hImpersonatedToken != -1) CloseHandle(hImpersonatedToken);
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if (hToken != -1) CloseHandle(hToken);
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return rc;
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}
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