From a031b83a09a8628435317a03f199cdc18b78262f Mon Sep 17 00:00:00 2001 From: Matthew Heon Date: Wed, 1 Nov 2017 11:24:59 -0400 Subject: Initial checkin from CRI-O repo Signed-off-by: Matthew Heon --- vendor/github.com/Microsoft/go-winio/privilege.go | 202 ++++++++++++++++++++++ 1 file changed, 202 insertions(+) create mode 100644 vendor/github.com/Microsoft/go-winio/privilege.go (limited to 'vendor/github.com/Microsoft/go-winio/privilege.go') diff --git a/vendor/github.com/Microsoft/go-winio/privilege.go b/vendor/github.com/Microsoft/go-winio/privilege.go new file mode 100644 index 000000000..9c83d36fe --- /dev/null +++ b/vendor/github.com/Microsoft/go-winio/privilege.go @@ -0,0 +1,202 @@ +// +build windows + +package winio + +import ( + "bytes" + "encoding/binary" + "fmt" + "runtime" + "sync" + "syscall" + "unicode/utf16" + + "golang.org/x/sys/windows" +) + +//sys adjustTokenPrivileges(token windows.Token, releaseAll bool, input *byte, outputSize uint32, output *byte, requiredSize *uint32) (success bool, err error) [true] = advapi32.AdjustTokenPrivileges +//sys impersonateSelf(level uint32) (err error) = advapi32.ImpersonateSelf +//sys revertToSelf() (err error) = advapi32.RevertToSelf +//sys openThreadToken(thread syscall.Handle, accessMask uint32, openAsSelf bool, token *windows.Token) (err error) = advapi32.OpenThreadToken +//sys getCurrentThread() (h syscall.Handle) = GetCurrentThread +//sys lookupPrivilegeValue(systemName string, name string, luid *uint64) (err error) = advapi32.LookupPrivilegeValueW +//sys lookupPrivilegeName(systemName string, luid *uint64, buffer *uint16, size *uint32) (err error) = advapi32.LookupPrivilegeNameW +//sys lookupPrivilegeDisplayName(systemName string, name *uint16, buffer *uint16, size *uint32, languageId *uint32) (err error) = advapi32.LookupPrivilegeDisplayNameW + +const ( + SE_PRIVILEGE_ENABLED = 2 + + ERROR_NOT_ALL_ASSIGNED syscall.Errno = 1300 + + SeBackupPrivilege = "SeBackupPrivilege" + SeRestorePrivilege = "SeRestorePrivilege" +) + +const ( + securityAnonymous = iota + securityIdentification + securityImpersonation + securityDelegation +) + +var ( + privNames = make(map[string]uint64) + privNameMutex sync.Mutex +) + +// PrivilegeError represents an error enabling privileges. +type PrivilegeError struct { + privileges []uint64 +} + +func (e *PrivilegeError) Error() string { + s := "" + if len(e.privileges) > 1 { + s = "Could not enable privileges " + } else { + s = "Could not enable privilege " + } + for i, p := range e.privileges { + if i != 0 { + s += ", " + } + s += `"` + s += getPrivilegeName(p) + s += `"` + } + return s +} + +// RunWithPrivilege enables a single privilege for a function call. +func RunWithPrivilege(name string, fn func() error) error { + return RunWithPrivileges([]string{name}, fn) +} + +// RunWithPrivileges enables privileges for a function call. +func RunWithPrivileges(names []string, fn func() error) error { + privileges, err := mapPrivileges(names) + if err != nil { + return err + } + runtime.LockOSThread() + defer runtime.UnlockOSThread() + token, err := newThreadToken() + if err != nil { + return err + } + defer releaseThreadToken(token) + err = adjustPrivileges(token, privileges, SE_PRIVILEGE_ENABLED) + if err != nil { + return err + } + return fn() +} + +func mapPrivileges(names []string) ([]uint64, error) { + var privileges []uint64 + privNameMutex.Lock() + defer privNameMutex.Unlock() + for _, name := range names { + p, ok := privNames[name] + if !ok { + err := lookupPrivilegeValue("", name, &p) + if err != nil { + return nil, err + } + privNames[name] = p + } + privileges = append(privileges, p) + } + return privileges, nil +} + +// EnableProcessPrivileges enables privileges globally for the process. +func EnableProcessPrivileges(names []string) error { + return enableDisableProcessPrivilege(names, SE_PRIVILEGE_ENABLED) +} + +// DisableProcessPrivileges disables privileges globally for the process. +func DisableProcessPrivileges(names []string) error { + return enableDisableProcessPrivilege(names, 0) +} + +func enableDisableProcessPrivilege(names []string, action uint32) error { + privileges, err := mapPrivileges(names) + if err != nil { + return err + } + + p, _ := windows.GetCurrentProcess() + var token windows.Token + err = windows.OpenProcessToken(p, windows.TOKEN_ADJUST_PRIVILEGES|windows.TOKEN_QUERY, &token) + if err != nil { + return err + } + + defer token.Close() + return adjustPrivileges(token, privileges, action) +} + +func adjustPrivileges(token windows.Token, privileges []uint64, action uint32) error { + var b bytes.Buffer + binary.Write(&b, binary.LittleEndian, uint32(len(privileges))) + for _, p := range privileges { + binary.Write(&b, binary.LittleEndian, p) + binary.Write(&b, binary.LittleEndian, action) + } + prevState := make([]byte, b.Len()) + reqSize := uint32(0) + success, err := adjustTokenPrivileges(token, false, &b.Bytes()[0], uint32(len(prevState)), &prevState[0], &reqSize) + if !success { + return err + } + if err == ERROR_NOT_ALL_ASSIGNED { + return &PrivilegeError{privileges} + } + return nil +} + +func getPrivilegeName(luid uint64) string { + var nameBuffer [256]uint16 + bufSize := uint32(len(nameBuffer)) + err := lookupPrivilegeName("", &luid, &nameBuffer[0], &bufSize) + if err != nil { + return fmt.Sprintf("", luid) + } + + var displayNameBuffer [256]uint16 + displayBufSize := uint32(len(displayNameBuffer)) + var langID uint32 + err = lookupPrivilegeDisplayName("", &nameBuffer[0], &displayNameBuffer[0], &displayBufSize, &langID) + if err != nil { + return fmt.Sprintf("", string(utf16.Decode(nameBuffer[:bufSize]))) + } + + return string(utf16.Decode(displayNameBuffer[:displayBufSize])) +} + +func newThreadToken() (windows.Token, error) { + err := impersonateSelf(securityImpersonation) + if err != nil { + return 0, err + } + + var token windows.Token + err = openThreadToken(getCurrentThread(), syscall.TOKEN_ADJUST_PRIVILEGES|syscall.TOKEN_QUERY, false, &token) + if err != nil { + rerr := revertToSelf() + if rerr != nil { + panic(rerr) + } + return 0, err + } + return token, nil +} + +func releaseThreadToken(h windows.Token) { + err := revertToSelf() + if err != nil { + panic(err) + } + h.Close() +} -- cgit v1.2.3-54-g00ecf