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filter.go
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filter.go
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// SPDX-FileCopyrightText: 2023 Steffen Vogel <post@steffenvogel.de>
// SPDX-License-Identifier: Apache-2.0
package yubikey
import (
"fmt"
iso "cunicu.li/go-iso7816"
"cunicu.li/go-iso7816/filter"
)
func IsSerialNumber(sno uint32) filter.Filter {
return withDeviceInfo(func(di *DeviceInfo) bool {
return di.SerialNumber == sno
})
}
// HasFormFactor returns a filter which checks if the YubiKey
// has a given form factor.
func HasFormFactor(ff FormFactor) filter.Filter {
return withDeviceInfo(func(di *DeviceInfo) bool {
return di.FormFactor == ff
})
}
//nolint:gochecknoglobals
var (
IsFIPS = withDeviceInfo(func(di *DeviceInfo) bool {
return di.IsFIPS
})
IsLocked = withDeviceInfo(func(di *DeviceInfo) bool {
return di.IsLocked
})
)
// HasOTP is a filter which checks if the YubiKey has the OTP
// applet enabled.
func HasOTP(name string, card *iso.Card) (bool, error) {
return hasCapabilityEnabled(CapOTP)(name, card)
}
// HasU2F is a filter which checks if the YubiKey has the U2F
// applet enabled.
func HasU2F(name string, card *iso.Card) (bool, error) {
return hasCapabilityEnabled(CapU2F)(name, card)
}
// HasFIDO2 is a filter which checks if the YubiKey has the FIDO2
// applet enabled.
func HasFIDO2(name string, card *iso.Card) (bool, error) {
return hasCapabilityEnabled(CapFIDO2)(name, card)
}
// HasOATH is a filter which checks if the YubiKey has the OATH
// applet enabled.
func HasOATH(name string, card *iso.Card) (bool, error) {
return hasCapabilityEnabled(CapOATH)(name, card)
}
// HasPIV is a filter which checks if the YubiKey has the PIV
// applet enabled.
func HasPIV(name string, card *iso.Card) (bool, error) {
return hasCapabilityEnabled(CapPIV)(name, card)
}
// HasOpenPGP is a filter which checks if the YubiKey has the OpenPGP
// applet enabled.
func HasOpenPGP(name string, card *iso.Card) (bool, error) {
return hasCapabilityEnabled(CapOpenPGP)(name, card)
}
// HasHSMAuth is a filter which checks if the YubiKey has the HSM authentication
// applet enabled.
func HasHSMAuth(name string, card *iso.Card) (bool, error) {
return hasCapabilityEnabled(CapOpenPGP)(name, card)
}
func hasCapabilityEnabled(c Capability) filter.Filter {
return withDeviceInfo(func(di *DeviceInfo) bool {
return (di.CapsEnabledUSB|di.CapsEnabledNFC)&c != 0
})
}
func withDeviceInfo(cb func(di *DeviceInfo) bool) filter.Filter {
return withApplet(iso.AidYubicoOTP, func(c *iso.Card) (bool, error) {
di, err := GetDeviceInfo(c)
if err != nil {
return false, fmt.Errorf("failed to get device information: %w", err)
}
return cb(di), nil
})
}
func withApplet(aid []byte, cb func(c *iso.Card) (bool, error)) filter.Filter {
return func(name string, c *iso.Card) (bool, error) {
// Matching against the name first saves us from connecting to the card
if match, err := filter.IsYubiKey(name, c); err != nil {
return false, err
} else if !match {
return false, nil
}
if c == nil {
return false, filter.ErrOpen
}
if _, err := c.Select(aid); err != nil {
return false, nil //nolint:nilerr
}
return cb(c)
}
}