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Smart Card Notes

< 10.7 Deprecated Smart Card Services (framework) Smart Card CCID (card drivers) TokenD (service to communicate with card)

Current = CryptoTokenKit API

Hardware (can buy all these from Apple)

Onmikey 3121

Mobile Hardware: Identive Cloud 2900R Identive SCR3500 Identive SCR3500A

Middleware Drivers available, but PIV is usually supported by the OS since its a US govt standard

Behavior Notes

Depending on config on smart card, entering invalid PIN x many times may lock the card

Authentication Methods (LEGACY?)

Local Account - Issues

  • Smartcard PIN must match local account password
    • immediate keychain errors as the PIN fails to unlock the "login" keychain
  • requires a ROOT CA Certificate to validate the card certificate
  • any card belonging to any user can be "attached" to any local account

PKINIT

Legacy Config (10.6.3 - 10.12?) /etc/cacloginconfig.plist

Current Config (10.12): /etc/SmartcardConfig.plist Sample:

<key>AttributeMapping</key>
<dict>
	<key>fields</key>
	<array>
		<string>Common Name</string>
		<string>RFC 822 Name</string>
	</array>
	<key>formatString</key>
	<string>$2-$1</string>
	<key>dsAttributeString</key>
	<string>dsattrTypeNative:longName</string>
</dict>

Note formatString which specifies if multiple strings are joined together

Mapping process for local accounts (not needed for AD bound machine):

  • get User Principal Name off card
  • append UPN to user's directory record
  • add to /etc/SmartcardLogin.plist:

Match User to card cert

Hash Matching (tokend) / Fixed Key Mapping (CTK): Pairs the hash value of the card certs to a local account dscl record

Attribute Matching: Allows selected attributes on a card cert to be mapped to an AD attribute

PKINIT

Commands CTK

security list-smartcards
security export-smartcard
security smartcards

associate a user with a public key on a card
sc_auth pair
list all identities on all smart cards
sc_auth identities
list all public keys associated with a user
sc_auth list

Documentation

man ssh-keychain
man SmartCardServices
man SmartCardServices-legacy
man pam_smartcard
system_profiler SPSmartCardsDataType

Commands (LEGACY)

User authentication at the login window and screensaver: security authorizationdb smartcard enable|disable

Display all hashes on the system sc_auth hash Add the hash of a cert to a user account sc_auth accept -u *username* -h *hash* Show any certificate hashes for a given username sc_auth list -u *username*

PAM Modules / SSH

PAM modules revert upon OS update. Use ext attr to monitor and remediate. /etc/pam.d/*

screensaver: /etc/pam.d/screensaver loginwindow: /etc/pam.d/authorization sudo: /etc/pam.d/sudo -play with this, order may matter and might just need "sufficient" ("required" may require password + pin)

SSH: /etc/ssh/sshd_config /etc/ssh/ssh_config https://support.apple.com/en-us/HT208372 grep -c ssh-keychain.dylib /etc/ssh/ssh_config

Config Profiles

Locks Screen when card is pulled out
payloadType: com.apple.screensaver
Key: tokenRemovalAction
Type: Int
Setting: 1|0

Enable|Disable prompt when card is plugged in (does not affect existing pairings, disable to avoid users pairing by themselves if admin)
payLoadType: com.apple.smardcard
Key: UserPairing
Type: Bool

Enable|Disable cards for login/screesaver/auth
Key: allowSmartCard
Type: Bool

Make sure certificates on the card are trusted
Key: checkCertificateTrust
Type: Int Options: 0 - no certificate trust needed 1 - certificate trust on, no revocation check 2 - certificate trust on, soft revocation (will allow you to unlock if cannot CRL or OCSP) 3 - certificate trust on, hard revocation (will lock if cannot CRL or OCSP)

Restrict user account to a single smart card, as opposed to multiple users on 1 account (maybe Tier2 technicians accessing a local account) Doesn't affect current pairings
Key: OneCardPerUser
Type: Bool

Disable FileVault auto-login
payloadType: com.apple.loginwindow
Key: DisableFDEAutoLogin
Type: Bool

Show list of users at login window (maybe legacy requirement?)
payloadType: com.apple.loginwindow
Key: SHOWFULLNAME
Type: Int (0)

Turn on smartcard debug (com.apple.security.smartcard.log https://ludovicrousseau.blogspot.com/2015/02/debug-smart-card-application-on-yosemite.html)
payloadType: com.apple.security.smartcard
Key: Logging
Type: Bool

Disable CTK if you want to only use tokend payloadType: com.apple.security.smartcard Type: array Key: DisabledTokens Array: com.apple.CryptoTokenKit.pivtoken