Under Crostini in ChromeOS with the YubiKey USB device passed into the container, ykman can't find the key, but gpg --card-status can....

[spoelstraethan]

yubikey-manager/ykman/device.py

Line 57 in 0f29036

from .pcsc import list_devices as _list_ccid_devices

You would be surprised at how many developers serious about security throw a fit when their Yubikey isn't working in Crostini, luckily this just appears to be an issue with detection by the Yubikey Manager app/CLI and doesn't affect the GPG functionality they tend to be clamoring for.

I'm curious whether this detection is relying solely on the HID while also discovering the CCID/GPG capabilities, or if it can detect a card that has OTP+FIDO+CCID enabled but only part of those are visible due to the Crostini/ChromeOS security layer.

The gpg --card-status output looks normal (taken from a 5C not the 5NFC used later, but same things visible):

gpg --card-status
Reader ...........: 1050:0407:X:0
Application ID ...: D2760001240103040006150058910000
Version ..........: 3.4
Manufacturer .....: Yubico
Serial number ....: 00000000
Name of cardholder: [not set]
Language prefs ...: [not set]
Sex ..............: unspecified
URL of public key : [not set]
Login data .......: [not set]
Signature PIN ....: not forced
Key attributes ...: rsa2048 rsa2048 rsa2048
Max. PIN lengths .: 127 127 127
PIN retry counter : 3 0 3
Signature counter : 0
KDF setting ......: on
Signature key ....: [none]
Encryption key....: [none]
Authentication key: [none]
General key info..: [none]

This is what I see of the device in Crostini:
Running pcsc_scan:

pcsc_scan 
Using reader plug'n play mechanism
Scanning present readers...
0: Yubico YubiKey OTP+FIDO+CCID 00 00
 
Sun Nov 14 15:44:06 2021
 Reader 0: Yubico YubiKey OTP+FIDO+CCID 00 00
  Event number: 0
  Card state: Card inserted, 
  ATR: 3B FD 13 00 00 81 31 FE 15 80 73 C0 21 C0 57 59 75 62 69 4B 65 79 40

ATR: 3B FD 13 00 00 81 31 FE 15 80 73 C0 21 C0 57 59 75 62 69 4B 65 79 40
+ TS = 3B --> Direct Convention
+ T0 = FD, Y(1): 1111, K: 13 (historical bytes)
  TA(1) = 13 --> Fi=372, Di=4, 93 cycles/ETU
    43010 bits/s at 4 MHz, fMax for Fi = 5 MHz => 53763 bits/s
  TB(1) = 00 --> VPP is not electrically connected
  TC(1) = 00 --> Extra guard time: 0
  TD(1) = 81 --> Y(i+1) = 1000, Protocol T = 1 
-----
  TD(2) = 31 --> Y(i+1) = 0011, Protocol T = 1 
-----
  TA(3) = FE --> IFSC: 254
  TB(3) = 15 --> Block Waiting Integer: 1 - Character Waiting Integer: 5
+ Historical bytes: 80 73 C0 21 C0 57 59 75 62 69 4B 65 79
  Category indicator byte: 80 (compact TLV data object)
    Tag: 7, len: 3 (card capabilities)
      Selection methods: C0
        - DF selection by full DF name
        - DF selection by partial DF name
      Data coding byte: 21
        - Behaviour of write functions: proprietary
        - Value 'FF' for the first byte of BER-TLV tag fields: invalid
        - Data unit in quartets: 2
      Command chaining, length fields and logical channels: C0
        - Command chaining
        - Extended Lc and Le fields
        - Logical channel number assignment: No logical channel
        - Maximum number of logical channels: 1
    Tag: 5, len: 7 (card issuer's data)
      Card issuer data: 59 75 62 69 4B 65 79
+ TCK = 40 (correct checksum)

Possibly identified card (using /usr/share/pcsc/smartcard_list.txt):
3B FD 13 00 00 81 31 FE 15 80 73 C0 21 C0 57 59 75 62 69 4B 65 79 40
        Yubico YubiKey 5 NFC (PKI)
        https://www.yubico.com/product/yubikey-5-nfc

sudo lsusb -v -d 1050:

Bus 001 Device 003: ID 1050:0407 Yubico.com Yubikey 4 OTP+U2F+CCID
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x1050 Yubico.com
  idProduct          0x0407 Yubikey 4 OTP+U2F+CCID
  bcdDevice            5.11
  iManufacturer           1 Yubico
  iProduct                2 YubiKey OTP+FIDO+CCID
  iSerial                 3 0000000000
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0096
    bNumInterfaces          3
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0x80
      (Bus Powered)
    MaxPower               30mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0 
      ** UNRECOGNIZED:  09 21 10 01 00 01 22 47 00
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              10
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0 
      ** UNRECOGNIZED:  09 21 10 01 00 01 22 22 00
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x04  EP 4 OUT
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               2
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x84  EP 4 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               2
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       0
      bNumEndpoints           3
      bInterfaceClass        11 Chip/SmartCard
      bInterfaceSubClass      0 
      bInterfaceProtocol      0 
      iInterface              0 
      ChipCard Interface Descriptor:
        bLength                54
        bDescriptorType        33
        bcdCCID              1.00
        nMaxSlotIndex           0
        bVoltageSupport         7  5.0V 3.0V 1.8V 
        dwProtocols             2  T=1
        dwDefaultClock       4000
        dwMaxiumumClock      4000
        bNumClockSupported      0
        dwDataRate         307200 bps
        dwMaxDataRate      307200 bps
        bNumDataRatesSupp.      0
        dwMaxIFSD            3062
        dwSyncProtocols  00000000 
        dwMechanical     00000000 
        dwFeatures       000400FE
          Auto configuration based on ATR
          Auto activation on insert
          Auto voltage selection
          Auto clock change
          Auto baud rate change
          Auto parameter negotiation made by CCID
          Short and extended APDU level exchange
        dwMaxCCIDMsgLen      3072
        bClassGetResponse    echo
        bClassEnvelope       echo
        wlcdLayout           none
        bPINSupport             0 
        bMaxCCIDBusySlots       1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              32
Device Status:     0x0000
  (Bus Powered)

Versus what I see in the Crosh shell (ChromeOS command line):

lsusb -v -d 1050:

Bus 001 Device 008: ID 1050:0407 Yubico.com YubiKey OTP+FIDO+CCID
Couldn't open device, some information will be missing
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x1050 Yubico.com
  idProduct          0x0407 
  bcdDevice            5.11
  iManufacturer           1 Yubico
  iProduct                2 YubiKey OTP+FIDO+CCID
  iSerial                 3 0000000000
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0096
    bNumInterfaces          3
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0x80
      (Bus Powered)
    MaxPower               30mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Device
      bInterfaceSubClass      1 Boot Interface Subclass
      bInterfaceProtocol      1 Keyboard
      iInterface              0 
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.10
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      71
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              10
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         3 Human Interface Device
      bInterfaceSubClass      0 
      bInterfaceProtocol      0 
      iInterface              0 
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.10
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      34
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x04  EP 4 OUT
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               2
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x84  EP 4 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               2
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       0
      bNumEndpoints           3
      bInterfaceClass        11 Chip/SmartCard
      bInterfaceSubClass      0 
      bInterfaceProtocol      0 
      iInterface              0 
      ChipCard Interface Descriptor:
        bLength                54
        bDescriptorType        33
        bcdCCID              1.00
        nMaxSlotIndex           0
        bVoltageSupport         7  5.0V 3.0V 1.8V 
        dwProtocols             2  T=1
        dwDefaultClock       4000
        dwMaxiumumClock      4000
        bNumClockSupported      0
        dwDataRate         307200 bps
        dwMaxDataRate      307200 bps
        bNumDataRatesSupp.      0
        dwMaxIFSD            3062
        dwSyncProtocols  00000000 
        dwMechanical     00000000 
        dwFeatures       000400FE
          Auto configuration based on ATR
          Auto activation on insert
          Auto voltage selection
          Auto clock change
          Auto baud rate change
          Auto parameter negotiation made by CCID
          Short and extended APDU level exchange
        dwMaxCCIDMsgLen      3072
        bClassGetResponse    echo
        bClassEnvelope       echo
        wlcdLayout           none
        bPINSupport             0 
        bMaxCCIDBusySlots       1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              32

[dainnilsson]

ykman should be able to detect the key even if some of the USB transports aren't accessible. The best way to see what's going on would be to run ykman --diagnose, which will attempt to connect over all 3 transports.

[srstsavage]

FWIW, ykman is successfully detecting a YubiKey 5 NFC for me inside a Debian 11 crostini vm under ChromeOS 98.0.4758.91 once access is provided to the VM in the ChromeOS Linux USB Preferences menu.

$ lsusb | grep Yubikey
Bus 001 Device 009: ID 1050:0407 Yubico.com Yubikey 4/5 OTP+U2F+CCID
$ ykman info
Device type: YubiKey 5 NFC
Serial number: XXXXXX
Firmware version: 5.2.7
Form factor: Keychain (USB-A)
Enabled USB interfaces: OTP, FIDO, CCID
NFC transport is enabled.

Applications    USB             NFC          
FIDO2           Enabled         Enabled      
OTP             Enabled         Enabled      
FIDO U2F        Enabled         Enabled      
OATH            Enabled         Enabled      
YubiHSM Auth    Not available   Not available
OpenPGP         Enabled         Enabled      
PIV             Enabled         Enabled   

I haven't got FIDO/U2F working however, I assume because of the lack of hidraw support in the crostini vm.

$ ykman fido info
Error: No YubiKey found with the given interface(s)
$ ls -l /dev/hidraw*
zsh: no matches found: /dev/hidraw*
$ ls -l /sys/class/hidraw   
ls: cannot access '/sys/class/hidraw': No such file or directory

I noted this on a related chromium issue, hoping to get a response there.