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a5dcc4c87b
Some OS-specific funcs were defined in init. Another used build tags and required all other OSes to stub it out. Another one could just be in the portable file. Simplify it a bit, removing a file and some stubs in the process. Updates #5794 Change-Id: I51df8772cc60a9335ac4c1dc0ab59b8a0d236961 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
101 lines
3.0 KiB
Go
101 lines
3.0 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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package paths
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import (
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"os"
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"path/filepath"
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"strings"
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"golang.org/x/sys/windows"
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"tailscale.com/util/winutil"
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)
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func init() {
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ensureStateDirPerms = ensureStateDirPermsWindows
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}
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// ensureStateDirPermsWindows applies a restrictive ACL to the directory specified by dirPath.
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// It sets the following security attributes on the directory:
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// Owner: The user for the current process;
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// Primary Group: The primary group for the current process;
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// DACL: Full control to the current user and to the Administrators group.
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//
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// (We include Administrators so that admin users may still access logs;
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// granting access exclusively to LocalSystem would require admins to use
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// special tools to access the Log directory)
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//
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// Inheritance: The directory does not inherit the ACL from its parent.
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//
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// However, any directories and/or files created within this
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// directory *do* inherit the ACL that we are setting.
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func ensureStateDirPermsWindows(dirPath string) error {
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fi, err := os.Stat(dirPath)
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if err != nil {
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return err
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}
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if !fi.IsDir() {
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return os.ErrInvalid
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}
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if strings.ToLower(filepath.Base(dirPath)) != "tailscale" {
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return nil
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}
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// We need the info for our current user as SIDs
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sids, err := winutil.GetCurrentUserSIDs()
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if err != nil {
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return err
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}
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// We also need the SID for the Administrators group so that admins may
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// easily access logs.
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adminGroupSid, err := windows.CreateWellKnownSid(windows.WinBuiltinAdministratorsSid)
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if err != nil {
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return err
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}
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// Munge the SIDs into the format required by EXPLICIT_ACCESS.
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userTrustee := windows.TRUSTEE{nil, windows.NO_MULTIPLE_TRUSTEE,
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windows.TRUSTEE_IS_SID, windows.TRUSTEE_IS_USER,
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windows.TrusteeValueFromSID(sids.User)}
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adminTrustee := windows.TRUSTEE{nil, windows.NO_MULTIPLE_TRUSTEE,
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windows.TRUSTEE_IS_SID, windows.TRUSTEE_IS_WELL_KNOWN_GROUP,
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windows.TrusteeValueFromSID(adminGroupSid)}
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// We declare our access rights via this array of EXPLICIT_ACCESS structures.
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// We set full access to our user and to Administrators.
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// We configure the DACL such that any files or directories created within
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// dirPath will also inherit this DACL.
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explicitAccess := []windows.EXPLICIT_ACCESS{
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{
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windows.GENERIC_ALL,
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windows.SET_ACCESS,
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windows.SUB_CONTAINERS_AND_OBJECTS_INHERIT,
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userTrustee,
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},
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{
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windows.GENERIC_ALL,
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windows.SET_ACCESS,
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windows.SUB_CONTAINERS_AND_OBJECTS_INHERIT,
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adminTrustee,
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},
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}
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dacl, err := windows.ACLFromEntries(explicitAccess, nil)
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if err != nil {
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return err
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}
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// We now reset the file's owner, primary group, and DACL.
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// We also must pass PROTECTED_DACL_SECURITY_INFORMATION so that our new ACL
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// does not inherit any ACL entries from the parent directory.
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const flags = windows.OWNER_SECURITY_INFORMATION |
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windows.GROUP_SECURITY_INFORMATION |
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windows.DACL_SECURITY_INFORMATION |
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windows.PROTECTED_DACL_SECURITY_INFORMATION
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return windows.SetNamedSecurityInfo(dirPath, windows.SE_FILE_OBJECT, flags,
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sids.User, sids.PrimaryGroup, dacl, nil)
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}
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