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Get address sanitizer mostly working

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Justine Tunney 2020-09-03 05:44:37 -07:00
parent 1f1f3cd477
commit 7327c345f9
149 changed files with 3777 additions and 3457 deletions
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libc/calls/ntaccesscheck.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/nt/enum/accessmask.h"
#include "libc/nt/enum/securityinformation.h"
#include "libc/nt/errors.h"
#include "libc/nt/files.h"
#include "libc/nt/runtime.h"
#include "libc/nt/struct/genericmapping.h"
#include "libc/nt/struct/privilegeset.h"
#include "libc/nt/struct/securitydescriptor.h"
#include "libc/runtime/runtime.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/ok.h"
/**
* Asks Microsoft if we're authorized to use a folder or file.
*
* Implementation Details: MSDN documentation imposes no limit on the
* internal size of SECURITY_DESCRIPTOR, which we are responsible for
* allocating. We've selected 1024 which shall hopefully be adequate.
*
* @param flags can have R_OK, W_OK, X_OK, etc.
* @return 0 if authorized, or -1 w/ errno
* @kudos Aaron Ballman for teaching this
* @see libc/sysv/consts.sh
*/
textwindows int ntaccesscheck(const char16_t *pathname, uint32_t flags) {
int rc;
bool32 result;
struct NtGenericMapping mapping;
struct NtPrivilegeSet privileges;
int64_t hToken, hImpersonatedToken;
uint32_t secsize, granted, privsize;
union NtSecurityDescriptorLol {
struct NtSecurityDescriptor s;
char b[1024];
} security;
granted = 0;
result = false;
secsize = sizeof(security);
privsize = sizeof(privileges);
memset(&privileges, 0, sizeof(privileges));
mapping.GenericRead = kNtFileGenericRead;
mapping.GenericWrite = kNtFileGenericWrite;
mapping.GenericExecute = kNtFileGenericExecute;
mapping.GenericAll = kNtFileAllAccess;
MapGenericMask(&flags, &mapping);
hImpersonatedToken = hToken = -1;
if (GetFileSecurity(pathname,
kNtOwnerSecurityInformation |
kNtGroupSecurityInformation |
kNtDaclSecurityInformation,
&security.s, 0, &secsize) &&
OpenProcessToken(GetCurrentProcess(),
kNtTokenImpersonate | kNtTokenQuery | kNtTokenDuplicate |
kNtStandardRightsRead,
&hToken) &&
DuplicateToken(hToken, kNtSecurityImpersonation, &hImpersonatedToken) &&
AccessCheck(&security.s, hImpersonatedToken, flags, &mapping, &privileges,
&privsize, &granted, &result) &&
(result || flags == F_OK)) {
rc = 0;
} else {
rc = winerr();
}
close(hImpersonatedToken);
close(hToken);
return rc;
}