134 lines
4.3 KiB
Go
134 lines
4.3 KiB
Go
//go:build windows
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// +build windows
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package winio
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import (
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"errors"
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"fmt"
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"unsafe"
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"golang.org/x/sys/windows"
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)
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//sys lookupAccountName(systemName *uint16, accountName string, sid *byte, sidSize *uint32, refDomain *uint16, refDomainSize *uint32, sidNameUse *uint32) (err error) = advapi32.LookupAccountNameW
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//sys lookupAccountSid(systemName *uint16, sid *byte, name *uint16, nameSize *uint32, refDomain *uint16, refDomainSize *uint32, sidNameUse *uint32) (err error) = advapi32.LookupAccountSidW
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//sys convertSidToStringSid(sid *byte, str **uint16) (err error) = advapi32.ConvertSidToStringSidW
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//sys convertStringSidToSid(str *uint16, sid **byte) (err error) = advapi32.ConvertStringSidToSidW
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type AccountLookupError struct {
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Name string
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Err error
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}
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func (e *AccountLookupError) Error() string {
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if e.Name == "" {
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return "lookup account: empty account name specified"
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}
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var s string
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switch {
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case errors.Is(e.Err, windows.ERROR_INVALID_SID):
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s = "the security ID structure is invalid"
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case errors.Is(e.Err, windows.ERROR_NONE_MAPPED):
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s = "not found"
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default:
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s = e.Err.Error()
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}
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return "lookup account " + e.Name + ": " + s
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}
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func (e *AccountLookupError) Unwrap() error { return e.Err }
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type SddlConversionError struct {
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Sddl string
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Err error
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}
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func (e *SddlConversionError) Error() string {
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return "convert " + e.Sddl + ": " + e.Err.Error()
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}
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func (e *SddlConversionError) Unwrap() error { return e.Err }
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// LookupSidByName looks up the SID of an account by name
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//
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//revive:disable-next-line:var-naming SID, not Sid
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func LookupSidByName(name string) (sid string, err error) {
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if name == "" {
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return "", &AccountLookupError{name, windows.ERROR_NONE_MAPPED}
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}
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var sidSize, sidNameUse, refDomainSize uint32
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err = lookupAccountName(nil, name, nil, &sidSize, nil, &refDomainSize, &sidNameUse)
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if err != nil && err != windows.ERROR_INSUFFICIENT_BUFFER { //nolint:errorlint // err is Errno
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return "", &AccountLookupError{name, err}
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}
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sidBuffer := make([]byte, sidSize)
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refDomainBuffer := make([]uint16, refDomainSize)
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err = lookupAccountName(nil, name, &sidBuffer[0], &sidSize, &refDomainBuffer[0], &refDomainSize, &sidNameUse)
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if err != nil {
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return "", &AccountLookupError{name, err}
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}
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var strBuffer *uint16
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err = convertSidToStringSid(&sidBuffer[0], &strBuffer)
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if err != nil {
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return "", &AccountLookupError{name, err}
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}
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sid = windows.UTF16ToString((*[0xffff]uint16)(unsafe.Pointer(strBuffer))[:])
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_, _ = windows.LocalFree(windows.Handle(unsafe.Pointer(strBuffer)))
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return sid, nil
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}
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// LookupNameBySid looks up the name of an account by SID
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//
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//revive:disable-next-line:var-naming SID, not Sid
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func LookupNameBySid(sid string) (name string, err error) {
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if sid == "" {
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return "", &AccountLookupError{sid, windows.ERROR_NONE_MAPPED}
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}
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sidBuffer, err := windows.UTF16PtrFromString(sid)
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if err != nil {
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return "", &AccountLookupError{sid, err}
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}
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var sidPtr *byte
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if err = convertStringSidToSid(sidBuffer, &sidPtr); err != nil {
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return "", &AccountLookupError{sid, err}
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}
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defer windows.LocalFree(windows.Handle(unsafe.Pointer(sidPtr))) //nolint:errcheck
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var nameSize, refDomainSize, sidNameUse uint32
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err = lookupAccountSid(nil, sidPtr, nil, &nameSize, nil, &refDomainSize, &sidNameUse)
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if err != nil && err != windows.ERROR_INSUFFICIENT_BUFFER { //nolint:errorlint // err is Errno
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return "", &AccountLookupError{sid, err}
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}
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nameBuffer := make([]uint16, nameSize)
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refDomainBuffer := make([]uint16, refDomainSize)
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err = lookupAccountSid(nil, sidPtr, &nameBuffer[0], &nameSize, &refDomainBuffer[0], &refDomainSize, &sidNameUse)
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if err != nil {
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return "", &AccountLookupError{sid, err}
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}
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name = windows.UTF16ToString(nameBuffer)
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return name, nil
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}
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func SddlToSecurityDescriptor(sddl string) ([]byte, error) {
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sd, err := windows.SecurityDescriptorFromString(sddl)
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if err != nil {
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return nil, &SddlConversionError{Sddl: sddl, Err: err}
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}
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b := unsafe.Slice((*byte)(unsafe.Pointer(sd)), sd.Length())
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return b, nil
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}
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func SecurityDescriptorToSddl(sd []byte) (string, error) {
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if l := int(unsafe.Sizeof(windows.SECURITY_DESCRIPTOR{})); len(sd) < l {
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return "", fmt.Errorf("SecurityDescriptor (%d) smaller than expected (%d): %w", len(sd), l, windows.ERROR_INCORRECT_SIZE)
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}
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s := (*windows.SECURITY_DESCRIPTOR)(unsafe.Pointer(&sd[0]))
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return s.String(), nil
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}
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