| /* |
| * Copyright (c) 2004, 2011, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| #include <windows.h> |
| #include <malloc.h> |
| #include <string.h> |
| |
| #include "jni.h" |
| #include "jni_util.h" |
| #include "jdk_internal_agent_FileSystemImpl.h" |
| |
| JNIEXPORT jint JNICALL DEF_JNI_OnLoad(JavaVM *vm, void *reserved) |
| { |
| JNIEnv* env; |
| |
| if ((*vm)->GetEnv(vm, (void**) &env, JNI_VERSION_1_2) != JNI_OK) { |
| return JNI_EVERSION; /* JNI version not supported */ |
| } |
| |
| return JNI_VERSION_10; |
| } |
| |
| |
| /* |
| * Access mask to represent any file access |
| */ |
| #define ANY_ACCESS (FILE_GENERIC_READ | FILE_GENERIC_WRITE | FILE_GENERIC_EXECUTE) |
| |
| /* |
| * Returns JNI_TRUE if the specified file is on a file system that supports |
| * persistent ACLs (On NTFS file systems returns true, on FAT32 file systems |
| * returns false). |
| */ |
| static jboolean isSecuritySupported(JNIEnv* env, const char* path) { |
| char* root; |
| char* p; |
| BOOL res; |
| DWORD dwMaxComponentLength; |
| DWORD dwFlags; |
| char fsName[128]; |
| DWORD fsNameLength; |
| |
| /* |
| * Get root directory. Assume that files are absolute paths. For UNCs |
| * the slash after the share name is required. |
| */ |
| root = strdup(path); |
| if (*root == '\\') { |
| /* |
| * \\server\share\file ==> \\server\share\ |
| */ |
| int slashskip = 3; |
| p = root; |
| while ((*p == '\\') && (slashskip > 0)) { |
| char* p2; |
| p++; |
| p2 = strchr(p, '\\'); |
| if ((p2 == NULL) || (*p2 != '\\')) { |
| free(root); |
| JNU_ThrowIOException(env, "Malformed UNC"); |
| return JNI_FALSE; |
| } |
| p = p2; |
| slashskip--; |
| } |
| if (slashskip != 0) { |
| free(root); |
| JNU_ThrowIOException(env, "Malformed UNC"); |
| return JNI_FALSE; |
| } |
| p++; |
| *p = '\0'; |
| |
| } else { |
| p = strchr(root, '\\'); |
| if (p == NULL) { |
| free(root); |
| JNU_ThrowIOException(env, "Absolute filename not specified"); |
| return JNI_FALSE; |
| } |
| p++; |
| *p = '\0'; |
| } |
| |
| |
| /* |
| * Get the volume information - this gives us the file system file and |
| * also tells us if the file system supports persistent ACLs. |
| */ |
| fsNameLength = sizeof(fsName)-1; |
| res = GetVolumeInformation(root, |
| NULL, // address of name of the volume, can be NULL |
| 0, // length of volume name |
| NULL, // address of volume serial number, can be NULL |
| &dwMaxComponentLength, |
| &dwFlags, |
| fsName, |
| fsNameLength); |
| if (res == 0) { |
| free(root); |
| JNU_ThrowIOExceptionWithLastError(env, "GetVolumeInformation failed"); |
| return JNI_FALSE; |
| } |
| |
| free(root); |
| return (dwFlags & FS_PERSISTENT_ACLS) ? JNI_TRUE : JNI_FALSE; |
| } |
| |
| |
| /* |
| * Returns the security descriptor for a file. |
| */ |
| static SECURITY_DESCRIPTOR* getFileSecurityDescriptor(JNIEnv* env, const char* path) { |
| SECURITY_DESCRIPTOR* sd; |
| DWORD len = 0; |
| SECURITY_INFORMATION info = |
| OWNER_SECURITY_INFORMATION | DACL_SECURITY_INFORMATION; |
| |
| GetFileSecurityA(path, info , 0, 0, &len); |
| if (GetLastError() != ERROR_INSUFFICIENT_BUFFER) { |
| JNU_ThrowIOExceptionWithLastError(env, "GetFileSecurity failed"); |
| return NULL; |
| } |
| sd = (SECURITY_DESCRIPTOR *)malloc(len); |
| if (sd == NULL) { |
| JNU_ThrowOutOfMemoryError(env, 0); |
| } else { |
| if (!(*GetFileSecurityA)(path, info, sd, len, &len)) { |
| JNU_ThrowIOExceptionWithLastError(env, "GetFileSecurity failed"); |
| free(sd); |
| return NULL; |
| } |
| } |
| return sd; |
| } |
| |
| /* |
| * Returns pointer to the SID identifying the owner of the specified |
| * file. |
| */ |
| static SID* getFileOwner(JNIEnv* env, SECURITY_DESCRIPTOR* sd) { |
| SID* owner; |
| BOOL defaulted; |
| |
| if (!GetSecurityDescriptorOwner(sd, &owner, &defaulted)) { |
| JNU_ThrowIOExceptionWithLastError(env, "GetSecurityDescriptorOwner failed"); |
| return NULL; |
| } |
| return owner; |
| } |
| |
| /* |
| * Returns pointer discretionary access-control list (ACL) from the security |
| * descriptor of the specified file. |
| */ |
| static ACL* getFileDACL(JNIEnv* env, SECURITY_DESCRIPTOR* sd) { |
| ACL *acl; |
| int defaulted, present; |
| |
| if (!GetSecurityDescriptorDacl(sd, &present, &acl, &defaulted)) { |
| JNU_ThrowIOExceptionWithLastError(env, "GetSecurityDescriptorDacl failed"); |
| return NULL; |
| } |
| if (!present) { |
| JNU_ThrowInternalError(env, "Security descriptor does not contain a DACL"); |
| return NULL; |
| } |
| return acl; |
| } |
| |
| /* |
| * Returns JNI_TRUE if the specified owner is the only SID will access |
| * to the file. |
| */ |
| static jboolean isAccessUserOnly(JNIEnv* env, SID* owner, ACL* acl) { |
| ACL_SIZE_INFORMATION acl_size_info; |
| DWORD i; |
| |
| /* |
| * If there's no DACL then there's no access to the file |
| */ |
| if (acl == NULL) { |
| return JNI_TRUE; |
| } |
| |
| /* |
| * Get the ACE count |
| */ |
| if (!GetAclInformation(acl, (void *) &acl_size_info, sizeof(acl_size_info), |
| AclSizeInformation)) { |
| JNU_ThrowIOExceptionWithLastError(env, "GetAclInformation failed"); |
| return JNI_FALSE; |
| } |
| |
| /* |
| * Iterate over the ACEs. For each "allow" type check that the SID |
| * matches the owner, and check that the access is read only. |
| */ |
| for (i = 0; i < acl_size_info.AceCount; i++) { |
| void* ace; |
| ACCESS_ALLOWED_ACE *access; |
| SID* sid; |
| |
| if (!GetAce(acl, i, &ace)) { |
| JNU_ThrowIOExceptionWithLastError(env, "GetAce failed"); |
| return -1; |
| } |
| if (((ACCESS_ALLOWED_ACE *)ace)->Header.AceType != ACCESS_ALLOWED_ACE_TYPE) { |
| continue; |
| } |
| access = (ACCESS_ALLOWED_ACE *)ace; |
| sid = (SID *) &access->SidStart; |
| if (!EqualSid(owner, sid)) { |
| /* |
| * If the ACE allows any access then the file is not secure. |
| */ |
| if (access->Mask & ANY_ACCESS) { |
| return JNI_FALSE; |
| } |
| } |
| } |
| return JNI_TRUE; |
| } |
| |
| |
| /* |
| * Class: jdk_internal_agent_FileSystemImpl |
| * Method: init0 |
| * Signature: ()V |
| */ |
| JNIEXPORT void JNICALL Java_jdk_internal_agent_FileSystemImpl_init0 |
| (JNIEnv *env, jclass ignored) |
| { |
| /* nothing to do */ |
| } |
| |
| /* |
| * Class: jdk_internal_agent_FileSystemImpl |
| * Method: isSecuritySupported0 |
| * Signature: (Ljava/lang/String;)Z |
| */ |
| JNIEXPORT jboolean JNICALL Java_jdk_internal_agent_FileSystemImpl_isSecuritySupported0 |
| (JNIEnv *env, jclass ignored, jstring str) |
| { |
| jboolean res; |
| jboolean isCopy; |
| const char* path; |
| |
| path = JNU_GetStringPlatformChars(env, str, &isCopy); |
| if (path != NULL) { |
| res = isSecuritySupported(env, path); |
| if (isCopy) { |
| JNU_ReleaseStringPlatformChars(env, str, path); |
| } |
| return res; |
| } else { |
| /* exception thrown - doesn't matter what we return */ |
| return JNI_TRUE; |
| } |
| } |
| |
| |
| /* |
| * Class: jdk_internal_agent_FileSystemImpl |
| * Method: isAccessUserOnly0 |
| * Signature: (Ljava/lang/String;)Z |
| */ |
| JNIEXPORT jboolean JNICALL Java_jdk_internal_agent_FileSystemImpl_isAccessUserOnly0 |
| (JNIEnv *env, jclass ignored, jstring str) |
| { |
| jboolean res = JNI_FALSE; |
| jboolean isCopy; |
| const char* path; |
| |
| path = JNU_GetStringPlatformChars(env, str, &isCopy); |
| if (path != NULL) { |
| /* |
| * From the security descriptor get the file owner and |
| * DACL. Then check if anybody but the owner has access |
| * to the file. |
| */ |
| SECURITY_DESCRIPTOR* sd = getFileSecurityDescriptor(env, path); |
| if (sd != NULL) { |
| SID *owner = getFileOwner(env, sd); |
| if (owner != NULL) { |
| ACL* acl = getFileDACL(env, sd); |
| if (acl != NULL) { |
| res = isAccessUserOnly(env, owner, acl); |
| } else { |
| /* |
| * If acl is NULL it means that an exception was thrown |
| * or there is "all acess" to the file. |
| */ |
| res = JNI_FALSE; |
| } |
| } |
| free(sd); |
| } |
| if (isCopy) { |
| JNU_ReleaseStringPlatformChars(env, str, path); |
| } |
| } |
| return res; |
| } |
