def get_pivman_data(session: PivSession) -> PivmanData:
"""Reads out the Pivman data from a YubiKey."""
try:
return PivmanData(session.get_object(OBJECT_ID_PIVMAN_DATA))
except ApduError as e:
if e.sw == SW.FILE_NOT_FOUND:
# No data there, initialise a new object.
return PivmanData()
raise
def get_pivman_protected_data(session: PivSession) -> PivmanProtectedData:
"""Reads out the Pivman protected data from a YubiKey.
This function requires PIN verification prior to being called.
"""
try:
return PivmanProtectedData(session.get_object(OBJECT_ID_PIVMAN_PROTECTED_DATA))
except ApduError as e:
if e.sw == SW.FILE_NOT_FOUND:
# No data there, initialise a new object.
return PivmanProtectedData()
raise
def get_piv_info(session: PivSession) -> str:
"""Get human readable information about the PIV configuration."""
pivman = get_pivman_data(session)
lines = []
lines.append("PIV version: %d.%d.%d" % session.version)
try:
pin_data = session.get_pin_metadata()
if pin_data.default_value:
lines.append("WARNING: Using default PIN!")
tries_str = "%d/%d" % (pin_data.attempts_remaining,
pin_data.total_attempts)
except NotSupportedError:
# Largest possible number of PIN tries to get back is 15
tries = session.get_pin_attempts()
tries_str = "15 or more." if tries == 15 else str(tries)
lines.append(f"PIN tries remaining: {tries_str}")
if pivman.puk_blocked:
lines.append("PUK blocked.")
try:
metadata = session.get_management_key_metadata()
if metadata.default_value:
lines.append("WARNING: Using default Management key!")
key_type = metadata.key_type
except NotSupportedError:
key_type = MANAGEMENT_KEY_TYPE.TDES
lines.append(f"Management key algorithm: {key_type.name}")
if pivman.has_derived_key:
lines.append("Management key is derived from PIN.")
if pivman.has_stored_key:
lines.append(
"Management key is stored on the YubiKey, protected by PIN.")
try:
chuid = session.get_object(OBJECT_ID.CHUID).hex()
except ApduError as e:
if e.sw == SW.FILE_NOT_FOUND:
chuid = "No data available."
lines.append("CHUID:\t" + chuid)
try:
ccc = session.get_object(OBJECT_ID.CAPABILITY).hex()
except ApduError as e:
if e.sw == SW.FILE_NOT_FOUND:
ccc = "No data available."
lines.append("CCC: \t" + ccc)
for (slot, cert) in list_certificates(session).items():
lines.append(f"Slot {slot:02x}:")
if isinstance(cert, x509.Certificate):
try:
# Try to read out full DN, fallback to only CN.
# Support for DN was added in crytography 2.5
subject_dn = cert.subject.rfc4514_string()
issuer_dn = cert.issuer.rfc4514_string()
print_dn = True
except AttributeError:
print_dn = False
logger.debug("Failed to read DN, falling back to only CNs")
cn = cert.subject.get_attributes_for_oid(
x509.NameOID.COMMON_NAME)
subject_cn = cn[0].value if cn else "None"
cn = cert.issuer.get_attributes_for_oid(
x509.NameOID.COMMON_NAME)
issuer_cn = cn[0].value if cn else "None"
except ValueError as e:
# Malformed certificates may throw ValueError
logger.debug("Failed parsing certificate", exc_info=e)
lines.append(f"\tMalformed certificate: {e}")
continue
fingerprint = cert.fingerprint(hashes.SHA256()).hex()
try:
key_algo = KEY_TYPE.from_public_key(cert.public_key()).name
except ValueError:
key_algo = "Unsupported"
serial = cert.serial_number
try:
not_before: Optional[datetime] = cert.not_valid_before
except ValueError as e:
logger.debug("Failed reading not_valid_before", exc_info=e)
not_before = None
try:
not_after: Optional[datetime] = cert.not_valid_after
except ValueError as e:
logger.debug("Failed reading not_valid_after", exc_info=e)
not_after = None
# Print out everything
lines.append(f"\tAlgorithm:\t{key_algo}")
if print_dn:
lines.append(f"\tSubject DN:\t{subject_dn}")
lines.append(f"\tIssuer DN:\t{issuer_dn}")
else:
lines.append(f"\tSubject CN:\t{subject_cn}")
lines.append(f"\tIssuer CN:\t{issuer_cn}")
lines.append(f"\tSerial:\t\t{serial}")
lines.append(f"\tFingerprint:\t{fingerprint}")
if not_before:
lines.append(f"\tNot before:\t{not_before}")
if not_after:
lines.append(f"\tNot after:\t{not_after}")
else:
lines.append("\tError: Failed to parse certificate.")
return "\n".join(lines)
