[L] Change in pysim[master]: smdpp: cc support, proper checks, proper check order, test mode

15 Aug 2025

Hoernchen has uploaded this change for review. (
https://gerrit.osmocom.org/c/pysim/+/40880?usp=email )


Change subject: smdpp: cc support, proper checks, proper check order, test mode
......................................................................

smdpp: cc support, proper checks, proper check order, test mode

Change-Id: Ie4db65594b2eaf6c95ffc5e73ff9ae61c4d9d3a3

XX cc support

Change-Id: I7b22fe4eecb41d0f98e28a1d9390cd7fc8c5784c
---
M osmo-smdpp.py
M pySim/esim/x509_cert.py
A pySim/esim/x509_err.py
3 files changed, 803 insertions(+), 78 deletions(-)



  git pull ssh://gerrit.osmocom.org:29418/pysim refs/changes/80/40880/1

diff --git a/osmo-smdpp.py b/osmo-smdpp.py
index 94e64e8..69fae15 100755
--- a/osmo-smdpp.py
+++ b/osmo-smdpp.py
@@ -110,6 +110,7 @@
 from cryptography.hazmat.primitives import hashes # noqa: E402
 from cryptography.hazmat.primitives.asymmetric import ec, dh # noqa: E402
 from cryptography.hazmat.primitives.serialization import Encoding, PublicFormat,
PrivateFormat, NoEncryption, ParameterFormat # noqa: E402
+from cryptography.x509.oid import ExtensionOID, NameOID # noqa: E402
 from pathlib import Path # noqa: E402
 import json # noqa: E402
 import sys # noqa: E402
@@ -121,6 +122,7 @@
 from pprint import pprint as pp # noqa: E402
 
 import base64 # noqa: E402
+import time # noqa: E402
 from base64 import b64decode # noqa: E402
 from klein import Klein # noqa: E402
 from twisted.web.iweb import IRequest # noqa: E402
@@ -131,7 +133,11 @@
 from pySim.esim import saip, PMO # noqa: E402
 from pySim.esim.es8p import
ProfileMetadata,UnprotectedProfilePackage,ProtectedProfilePackage,BoundProfilePackage,BspInstance
# noqa: E402
 from pySim.esim.x509_cert import oid, cert_policy_has_oid, cert_get_auth_key_id # noqa:
E402
-from pySim.esim.x509_cert import CertAndPrivkey, CertificateSet, cert_get_subject_key_id,
VerifyError # noqa: E402
+from cryptography.x509 import ExtensionNotFound # noqa: E402
+from pySim.esim.x509_cert import CertAndPrivkey, CertificateSet, cert_get_subject_key_id
# noqa: E402
+from pySim.esim import x509_err # noqa: E402
+from datetime import datetime, timezone # noqa: E402
+import hashlib # noqa: E402
 
 import logging # noqa: E402
 logger = logging.getLogger(__name__)
@@ -344,6 +350,141 @@
     return encode_dss_signature(r, s)
 
 
+def compute_confirmation_code_hash(confirmation_code: str, transaction_id: bytes) ->
bytes:
+    """Compute confirmation code hash according to SGP.22 specification.
+    Hashed Confirmation Code = SHA256(SHA256(Confirmation Code) | TransactionID)
+    """
+
+    # Convert confirmation code from hex string to bytes (like EID handling)
+    cc_bytes = h2b(confirmation_code)
+
+    # Step 1: SHA256(Confirmation Code)
+    first_hash = hashlib.sha256(cc_bytes).digest()
+
+    # Step 2: SHA256(SHA256(CC) | TransactionID)
+    return hashlib.sha256(first_hash + transaction_id).digest()
+
+
+def validate_eum_certificate(eum_cert: x509.Certificate) -> None:
+    """Validate EUM certificate according to SGP.22 requirements.
+    Raises ApiError with appropriate error codes for different validation
failures."""
+
+    # Check KeyUsage extension
+    try:
+        key_usage = eum_cert.extensions.get_extension_for_oid(ExtensionOID.KEY_USAGE)
+        # EUM certificates are intermediate CAs that sign eUICC certificates, so they
need keyCertSign
+        if not key_usage.value.key_cert_sign:
+            # SGP.22 Table 49: EUM Certificate - Verification Failed
+            raise ApiError('8.1.2', '6.1', 'Certificate is
invalid')
+        # Check for critical flag
+        if not key_usage.critical:
+            # SGP.22 Table 49: EUM Certificate - Verification Failed
+            raise ApiError('8.1.2', '6.1', 'Certificate is
invalid')
+    except x509.ExtensionNotFound:
+        # SGP.22 Table 49: EUM Certificate - Verification Failed
+        raise ApiError('8.1.2', '6.1', 'Certificate is invalid')
+
+    # ExtendedKeyUsage not present in EUM certificates as they are intermediate CAs (?)
+
+    # Check Certificate Policies
+    try:
+        cert_policies =
eum_cert.extensions.get_extension_for_oid(ExtensionOID.CERTIFICATE_POLICIES)
+        # Check for required EUM policy OIDs
+        has_valid_policy = False
+        for policy in cert_policies.value:
+            policy_oid = policy.policy_identifier.dotted_string
+            # EUM policies: 2.23.146.1.2.1.2 (old) or 2.23.146.1.2.1.0.0.0 (new)
+            if policy_oid in ['2.23.146.1.2.1.2',
'2.23.146.1.2.1.0.0.0']:
+                has_valid_policy = True
+                break
+        if not has_valid_policy:
+            # SGP.22 Table 49: EUM Certificate - Verification Failed
+            raise ApiError('8.1.2', '6.1', 'Certificate is
invalid')
+    except x509.ExtensionNotFound:
+        # SGP.22 Table 49: EUM Certificate - Verification Failed
+        raise ApiError('8.1.2', '6.1', 'Certificate is invalid')
+
+    # Check BasicConstraints - EUM is an intermediate CA so it should have CA:TRUE (?)
+    try:
+        basic_constraints =
eum_cert.extensions.get_extension_for_oid(ExtensionOID.BASIC_CONSTRAINTS)
+        if not basic_constraints.value.ca:
+            # SGP.22 Table 49: EUM Certificate - Verification Failed
+            raise ApiError('8.1.2', '6.1', 'Certificate is
invalid')
+        # pathLenConstraint of 0 means it can only sign end-entity certificates
+        if basic_constraints.value.path_length is not None and
basic_constraints.value.path_length != 0:
+            # SGP.22 Table 49: EUM Certificate - Verification Failed
+            raise ApiError('8.1.2', '6.1', 'Certificate is
invalid')
+    except x509.ExtensionNotFound:
+        # SGP.22 Table 49: EUM Certificate - Verification Failed
+        raise ApiError('8.1.2', '6.1', 'Certificate is invalid')
+
+
+def validate_euicc_certificate(euicc_cert: x509.Certificate) -> None:
+    """Validate eUICC certificate according to SGP.22 requirements.
+    Raises ApiError with appropriate error codes for different validation
failures."""
+
+    # Check KeyUsage extension
+    try:
+        key_usage = euicc_cert.extensions.get_extension_for_oid(ExtensionOID.KEY_USAGE)
+        if not key_usage.value.digital_signature:
+            # SGP.22 Table 49: eUICC Certificate - Verification Failed
+            raise ApiError('8.1.3', '6.1', 'Certificate is
invalid')
+        if key_usage.value.key_cert_sign:
+            # SGP.22 Table 49: eUICC Certificate - Verification Failed
+            raise ApiError('8.1.3', '6.1', 'Certificate is
invalid')
+    except x509.ExtensionNotFound:
+        # SGP.22 Table 49: eUICC Certificate - Verification Failed
+        raise ApiError('8.1.3', '6.1', 'Certificate is invalid')
+
+    # ExtendedKeyUsage not present in eUICC certificates
+
+    # Check Certificate Policies
+    try:
+        cert_policies =
euicc_cert.extensions.get_extension_for_oid(ExtensionOID.CERTIFICATE_POLICIES)
+        # Check for required eUICC policy OIDs
+        has_valid_policy = False
+        for policy in cert_policies.value:
+            policy_oid = policy.policy_identifier.dotted_string
+            # eUICC policies would be under GSMA arc
+            if policy_oid.startswith('2.23.146.1.2.1'):
+                has_valid_policy = True
+                break
+        if not has_valid_policy:
+            # SGP.22 Table 49: eUICC Certificate - Verification Failed
+            raise ApiError('8.1.3', '6.1', 'Certificate is
invalid')
+    except x509.ExtensionNotFound:
+        # SGP.22 Table 49: eUICC Certificate - Verification Failed
+        raise ApiError('8.1.3', '6.1', 'Certificate is invalid')
+
+    # Check Subject fields
+    subject = euicc_cert.subject
+
+    # Verify Organization field
+    try:
+        org_attrs = subject.get_attributes_for_oid(NameOID.ORGANIZATION_NAME)
+        if not org_attrs:
+            # SGP.22 Table 49: eUICC Certificate - Verification Failed
+            raise ApiError('8.1.3', '6.1', 'Certificate is
invalid')
+    except Exception:
+        # SGP.22 Table 49: eUICC Certificate - Verification Failed
+        raise ApiError('8.1.3', '6.1', 'Certificate is invalid')
+
+    # Verify SerialNumber field (contains EID)
+    try:
+        serial_attrs = subject.get_attributes_for_oid(NameOID.SERIAL_NUMBER)
+        if not serial_attrs:
+            # SGP.22 Table 49: eUICC Certificate - Verification Failed
+            raise ApiError('8.1.3', '6.1', 'Certificate is
invalid')
+        eid = serial_attrs[0].value
+        if len(eid) != 32 or not all(c in '0123456789ABCDEFabcdef' for c in
eid):
+            # SGP.22 Table 49: eUICC Certificate - Verification Failed
+            raise ApiError('8.1.3', '6.1', 'Certificate is
invalid')
+    except Exception as e:
+        if not isinstance(e, ApiError):
+            # SGP.22 Table 49: eUICC Certificate - Verification Failed
+            raise ApiError('8.1.3', '6.1', 'Certificate is
invalid')
+
+
 class ApiError(Exception):
     def __init__(self, subject_code: str, reason_code: str, message: Optional[str] =
None,
                  subject_id: Optional[str] = None):
@@ -401,14 +542,19 @@
                     cs = CertificateSet(ci_cert)
                     cs.verify_cert_chain(self.dp_auth.cert)
                     return True
-                except VerifyError:
+                except x509_err.VerifyError:
                     continue
         return False
 
-    def __init__(self, server_hostname: str, ci_certs_path: str, common_cert_path: str,
use_brainpool: bool = False, in_memory: bool = False):
+    def __init__(self, server_hostname: str, ci_certs_path: str, common_cert_path: str,
use_brainpool: bool = False, in_memory: bool = False, test_mode: bool = False):
         self.server_hostname = server_hostname
         self.upp_dir = os.path.realpath(os.path.join(DATA_DIR, 'upp'))
         self.ci_certs = self.load_certs_from_path(ci_certs_path)
+        self.test_mode = test_mode
+        self.confirmation_codes = {
+            "CC_REQUIRED_TEST": "12345678"  # Special matchingId for
confirmation code tests
+        } if test_mode else {}
+
         # load DPauth cert + key
         self.dp_auth = CertAndPrivkey(oid.id_rspRole_dp_auth_v2)
         cert_dir = common_cert_path
@@ -435,6 +581,230 @@
             db_path = os.path.join(DATA_DIR,
f"sm-dp-sessions-{session_db_suffix}")
             self.rss = rsp.RspSessionStore(filename=db_path, in_memory=False)
             logger.info(f"Using file-based session storage: {db_path}")
+        self.otpk_mapping = {}  # Maps euicc_otpk -> (smdp_ot, smdp_otpk) for retry
scenarios
+
+        # Initialize profile configurations for test cases
+        if test_mode:
+            self._init_test_profiles()
+        else:
+            # Initialize empty profile dictionaries when not in test mode
+            self.activation_code_profiles = {}
+            self.event_based_profiles = {}
+            self.default_profiles = {}
+
+    def _init_test_profiles(self):
+        """Initialize test profiles for different use
cases."""
+        # Activation code profiles
+        print("INIT: Initializing test profiles...")
+        self.activation_code_profiles = {
+            'TEST123': {
+                'matchingId': 'TEST123',
+                'confirmationCode': '12345678',  # 8-digit numeric code
+                'iccid': '8900000000000000001F',
+                'profileName': 'Test Profile 1',
+                'state': 'released',
+                'download_attempts': 0,
+                'cc_attempts': 0,
+                'associated_eid': None,
+                'expiration': None
+            },
+            'AC_NOT_RELEASED': {
+                'matchingId': 'AC_NOT_RELEASED',
+                'confirmationCode': '87654321',
+                'iccid': '8900000000000000002F',
+                'profileName': 'Not Released Profile',
+                'state': 'not_released',
+                'download_attempts': 0,
+                'cc_attempts': 0,
+                'associated_eid': None,
+                'expiration': None
+            },
+            'AC_WITH_CC': {
+                'matchingId': 'AC_WITH_CC',
+                'confirmationCode': '11223344',
+                'iccid': '8900000000000000003F',
+                'profileName': 'Profile Requiring CC',
+                'state': 'released',
+                'download_attempts': 0,
+                'cc_attempts': 0,
+                'associated_eid': None,
+                'expiration': None
+            },
+            'AC_NO_CC': {
+                'matchingId': 'AC_NO_CC',
+                'confirmationCode': None,  # No confirmation code required
+                'iccid': '8900000000000000004F',
+                'profileName': 'Profile Without CC',
+                'state': 'released',
+                'download_attempts': 0,
+                'cc_attempts': 0,
+                'associated_eid': None,
+                'expiration': None
+            },
+            # Error test profiles
+            'AC_NO_ELIGIBLE': {
+                'matchingId': 'AC_NO_ELIGIBLE',
+                'confirmationCode': None,
+                'iccid': '8900000000000000009F',
+                'profileName': 'Profile with No Eligible Device',
+                'state': 'released',
+                'download_attempts': 0,
+                'cc_attempts': 0,
+                'associated_eid': None,
+                'expiration': None,
+                'device_requirements': {
+                    'min_memory_mb': 999999,  # Impossible requirement
+                    'required_features': ['IMPOSSIBLE_FEATURE']
+                }
+            },
+            'AC_EXPIRED': {
+                'matchingId': 'AC_EXPIRED',
+                'confirmationCode': None,
+                'iccid': '8900000000000000010F',
+                'profileName': 'Expired Download Order',
+                'state': 'released',
+                'download_attempts': 0,
+                'cc_attempts': 0,
+                'associated_eid': None,
+                'expiration': '2020-01-01T00:00:00Z'  # Expired
+            },
+            'AC_MAX_RETRIES': {
+                'matchingId': 'AC_MAX_RETRIES',
+                'confirmationCode': None,
+                'iccid': '8900000000000000011F',
+                'profileName': 'Max Retries Exceeded',
+                'state': 'released',
+                'download_attempts': 5,  # Already exceeded max attempts
+                'cc_attempts': 0,
+                'associated_eid': None,
+                'expiration': None
+            },
+            'AC_RESTRICTED_EID': {
+                'matchingId': 'AC_RESTRICTED_EID',
+                'confirmationCode': None,
+                'iccid': '8900000000000000012F',
+                'profileName': 'Profile Restricted to Different EID',
+                'state': 'released',
+                'download_attempts': 0,
+                'cc_attempts': 0,
+                'associated_eid': '89999999999999999999999999999999',  #
Different EID
+                'expiration': None
+            },
+            'AC_OTHER_EID': {
+                'matchingId': 'AC_OTHER_EID',
+                'confirmationCode': None,
+                'iccid': '8900000000000000013F',
+                'profileName': 'Profile for Other EID',
+                'state': 'released',
+                'download_attempts': 0,
+                'cc_attempts': 0,
+                'associated_eid': '89888888888888888888888888888888',  #
Different EID
+                'expiration': None
+            },
+            'MATCHING_ID_1': {
+                'matchingId': 'MATCHING_ID_1',
+                'confirmationCode': None,
+                'iccid': '8900000000000000017F',
+                'profileName': 'Test Activation Code Profile',
+                'state': 'released',
+                'download_attempts': 0,
+                'cc_attempts': 0,
+                'associated_eid': '89049032123451234512345678901235',
+                'expiration': None
+            },
+            'CC_REQUIRED_TEST': {
+                'matchingId': 'CC_REQUIRED_TEST',
+                'confirmationCode': '12345678',  # Requires confirmation
code
+                'iccid': '8900000000000000019F',
+                'profileName': 'CC Required Test Profile',
+                'state': 'released',
+                'download_attempts': 0,
+                'cc_attempts': 0,
+                'associated_eid': None,
+                'expiration': None
+            }
+        }
+
+        # SM-DS event-based profiles
+        self.event_based_profiles = {
+            'EVENT_001': {
+                'matchingId': 'EVENT_001',
+                'confirmationCode': '55667788',
+                'iccid': '8900000000000000005F',
+                'profileName': 'Event-based Profile 1',
+                'state': 'released',
+                'download_attempts': 0,
+                'cc_attempts': 0,
+                'associated_eid': None,
+                'expiration': None
+            },
+            'UNMATCHED_EVENT': {
+                'matchingId': 'UNMATCHED_EVENT',
+                'confirmationCode': '99887766',
+                'iccid': '8900000000000000006F',
+                'profileName': 'Unmatched Event Profile',
+                'state': 'released',
+                'download_attempts': 0,
+                'cc_attempts': 0,
+                'associated_eid': '89001012012341234012345678901224',  #
Different EID
+                'expiration': None
+            },
+            'EVENT_NORMAL': {
+                'matchingId': 'EVENT_NORMAL',
+                'confirmationCode': None,
+                'iccid': '8900000000000000014F',
+                'profileName': 'Normal SM-DS Event',
+                'state': 'released',
+                'download_attempts': 0,
+                'cc_attempts': 0,
+                'associated_eid': None,
+                'expiration': None
+            },
+            'EVENT_RESTRICTED': {
+                'matchingId': 'EVENT_RESTRICTED',
+                'confirmationCode': None,
+                'iccid': '8900000000000000015F',
+                'profileName': 'SM-DS Event Restricted to Different
EID',
+                'state': 'released',
+                'download_attempts': 0,
+                'cc_attempts': 0,
+                'associated_eid': '89777777777777777777777777777777',  #
Different EID
+                'expiration': None
+            },
+            'MATCHING_ID_EVENT': {
+                'matchingId': 'MATCHING_ID_EVENT',
+                'confirmationCode': None,
+                'iccid': '8900000000000000018F',
+                'profileName': 'Test Event-based Profile',
+                'state': 'released',
+                'download_attempts': 0,
+                'cc_attempts': 0,
+                'associated_eid': '89049032123451234512345678901235',
+                'expiration': None
+            }
+        }
+
+        # Default SM-DP+ profiles (associated with specific EIDs)
+        self.default_profiles = {
+            '89001012012341234012345678901234': {  # Test EID
+                'confirmationCode': '12345678',
+                'iccid': '8900000000000000007F',
+                'profileName': 'Default Profile for Test EID',
+                'state': 'released',
+                'download_attempts': 0,
+                'cc_attempts': 0,
+                'expiration': None
+            },
+            '89049032123451234512345678901235': {  # EID1 from test specs
+                'confirmationCode': None,
+                'iccid': '8900000000000000020F',
+                'profileName': 'Default Profile for EID1',
+                'state': 'released',
+                'download_attempts': 0,
+                'cc_attempts': 0,
+                'expiration': None
+            },
+        }
 
     @app.handle_errors(ApiError)
     def handle_apierror(self, request: IRequest, failure):
@@ -475,12 +845,12 @@
 
     @app.route('/gsma/rsp2/es9plus/initiateAuthentication',
methods=['POST'])
     @rsp_api_wrapper
-    def initiateAutentication(self, request: IRequest, content: dict) -> dict:
+    def initiateAuthentication(self, request: IRequest, content: dict) -> dict:
         """See ES9+ InitiateAuthentication SGP.22 Section
5.6.1"""
-        # Verify that the received address matches its own SM-DP+ address, where the
comparison SHALL be
-        # case-insensitive. Otherwise, the SM-DP+ SHALL return a status code "SM-DP+
Address - Refused".
-        if content['smdpAddress'] != self.server_hostname:
-           raise ApiError('8.8.1', '3.8', 'Invalid SM-DP+
Address')
+        # SGP.22 v2.5 Section 5.6.1: Verify that the received address matches its own
SM-DP+ address,
+        # where the comparison SHALL be case-insensitive.
+        if content['smdpAddress'].lower() != self.server_hostname.lower():
+           raise ApiError('8.8.1', '3.8', 'Invalid SM-DP+
Address')  # SGP.22 Table 46
 
         euiccChallenge = b64decode(content['euiccChallenge'])
         if len(euiccChallenge) != 16:
@@ -489,7 +859,22 @@
         euiccInfo1_bin = b64decode(content['euiccInfo1'])
         euiccInfo1 = rsp.asn1.decode('EUICCInfo1', euiccInfo1_bin)
         logger.debug("Rx euiccInfo1: %s" % euiccInfo1)
-        #euiccInfo1['svn']
+
+        # Validate specification version (SVN)
+        svn = euiccInfo1.get('svn', b'\x02\x02\x00')  # Default to v2.2.0
if not present
+        # Convert SVN bytes to version tuple (major, minor, revision)
+        svn_version = (svn[0], svn[1], svn[2])
+
+        # SM-DP+ supports versions from 2.0.0 to 2.3.x
+        min_version = (2, 0, 0)
+        max_version = (2, 3, 255)  # Allow any 2.3.x version
+
+        if svn_version < min_version:
+            # SGP.22 Table 46: Specification Version Number - Unsupported
+            raise ApiError('8.8.3', '3.1', 'The Specification Version
Number indicated by the eUICC is not supported by the SM-DP+')
+        elif svn_version[:2] > max_version[:2]:  # Compare major.minor only for upper
bound
+            # SGP.22 Table 46: Specification Version Number - Unsupported
+            raise ApiError('8.8.3', '3.1', 'The Specification Version
Number indicated by the eUICC is not supported by the SM-DP+')
 
         # TODO: If euiccCiPKIdListForSigningV3 is present ...
 
@@ -497,25 +882,36 @@
         if 'euiccCiPKIdListForSigningV3' in euiccInfo1:
             pkid_list = pkid_list + euiccInfo1['euiccCiPKIdListForSigningV3']
 
-        # Validate that SM-DP+ supports certificate chains for verification
-        verification_pkid_list = euiccInfo1.get('euiccCiPKIdListForVerification',
[])
-        if verification_pkid_list and not
self.validate_certificate_chain_for_verification(verification_pkid_list):
-            raise ApiError('8.8.4', '3.7', 'The SM-DP+ has no
CERT.DPauth.SIG which chains to one of the eSIM CA Root CA Certificate with a Public Key
supported by the eUICC')
-
-        # verify it supports one of the keys indicated by euiccCiPKIdListForSigning
+        # First verify PKIDs for signing are supported (check this before verification
PKIDs)
         ci_cert = None
         for x in pkid_list:
             ci_cert = self.ci_get_cert_for_pkid(x)
+            if not ci_cert:
+                # Skip if no certificate found for this PKID
+                continue
             # we already support multiple CI certificates but only one set of DPauth +
DPpb keys. So we must
             # make sure we choose a CI key-id which has issued both the eUICC as well as
our own SM-DP side
             # certs.
-            if ci_cert and cert_get_subject_key_id(ci_cert) ==
self.dp_auth.get_authority_key_identifier().key_identifier:
+            try:
+                ci_subject_key_id = cert_get_subject_key_id(ci_cert)
+            except Exception:
+                # For CI certs, we need to get the subject key identifier differently
+                subject_key_ext =
ci_cert.extensions.get_extension_for_oid(x509.oid.ExtensionOID.SUBJECT_KEY_IDENTIFIER)
+                ci_subject_key_id = subject_key_ext.value.key_identifier
+
+            if ci_subject_key_id ==
self.dp_auth.get_authority_key_identifier().key_identifier:
                 break
             else:
                 ci_cert = None
         if not ci_cert:
            raise ApiError('8.8.2', '3.1', 'None of the proposed
Public Key Identifiers is supported by the SM-DP+')
 
+        # After verifying signing PKIDs, validate certificate chains for verification
+        verification_pkid_list = euiccInfo1.get('euiccCiPKIdListForVerification',
[])
+        if verification_pkid_list and not
self.validate_certificate_chain_for_verification(verification_pkid_list):
+            # SGP.22 Table 46: SM-DP+ Certificate - Unavailable
+            raise ApiError('8.8.4', '3.7', 'The SM-DP+ has no
CERT.DPAuth.ECDSA signed by one of the GSMA CI Public Key supported by the eUICC')
+
         # Generate a TransactionID which is used to identify the ongoing RSP session. The
TransactionID
         # SHALL be unique within the scope and lifetime of each SM-DP+.
         transactionId = uuid.uuid4().hex.upper()
@@ -584,69 +980,265 @@
         euicc_cert = x509.load_der_x509_certificate(euiccCertificate_bin)
         eum_cert = x509.load_der_x509_certificate(eumCertificate_bin)
 
-        # Verify that the transactionId is known and relates to an ongoing RSP session. 
Otherwise, the SM-DP+
-        # SHALL return a status code "TransactionId - Unknown"
+        # Verify that the transactionId is known and relates to an ongoing RSP session.
         ss = self.rss.get(transactionId, None)
         if ss is None:
-            raise ApiError('8.10.1', '3.9', 'Unknown')
+            # SGP.22 Table 49: TransactionId - Unknown
+            raise ApiError('8.10.1', '3.9', 'The RSP session
identified by the TransactionID is unknown')
         ss.euicc_cert = euicc_cert
         ss.eum_cert = eum_cert # TODO: do we need this in the state?
 
-        # Verify that the Root Certificate of the eUICC certificate chain corresponds to
the
-        # euiccCiPKIdToBeUsed or TODO: euiccCiPKIdToBeUsedV3
-        if cert_get_auth_key_id(eum_cert) != ss.ci_cert_id:
-            raise ApiError('8.11.1', '3.9', 'Unknown')
+        # First verify that the Root Certificate of the eUICC certificate chain
corresponds to the
+        # euiccCiPKIdToBeUsed - this check must come before detailed certificate
validation
+        try:
+            eum_auth_key_id = cert_get_auth_key_id(eum_cert)
+        except (ExtensionNotFound, Exception) as e:
+            logger.error(f"Failed to get AuthorityKeyIdentifier from EUM
certificate: {e}")
+            # SGP.22 Table 49: EUM Certificate - Verification Failed
+            raise ApiError('8.1.2', '6.1', 'Certificate is
invalid')
+
+        if eum_auth_key_id != ss.ci_cert_id:
+            # SGP.22 Table 49: CI Public Key - Unknown
+            raise ApiError('8.11.1', '3.9', 'Unknown CI Public Key.
The CI used by the EUM Certificate is not a trusted root for the SM-DP+')
+
+        # Certificate validation checks - only do after CI key verification
+        try:
+            # Check if certificates are valid (not expired, proper format, etc.)
+            now = datetime.now(timezone.utc)
+
+            # Check EUM certificate validity period
+            if eum_cert.not_valid_after_utc < now:
+                # SGP.22 Table 49: EUM Certificate - Expired
+                raise ApiError('8.1.2', '6.3', 'Certificate has
expired')
+            if eum_cert.not_valid_before_utc > now:
+                # SGP.22 Table 49: EUM Certificate - Verification Failed
+                raise ApiError('8.1.2', '6.1', 'Certificate is
invalid')
+
+            # Check eUICC certificate validity period
+            if euicc_cert.not_valid_after_utc < now:
+                # SGP.22 Table 49: eUICC Certificate - Expired
+                raise ApiError('8.1.3', '6.3', 'Certificate has
expired')
+            if euicc_cert.not_valid_before_utc > now:
+                # SGP.22 Table 49: eUICC Certificate - Verification Failed
+                raise ApiError('8.1.3', '6.1', 'Certificate is
invalid')
+
+            # Perform detailed certificate validation
+            validate_eum_certificate(eum_cert)
+            validate_euicc_certificate(euicc_cert)
+
+        except ApiError:
+            raise  # Re-raise our API errors
+        except Exception as e:
+            logger.error(f"Certificate validation error: {e}")
+            # SGP.22 Table 49: eUICC Certificate - Verification Failed
+            raise ApiError('8.1.3', '6.1', 'Certificate is
invalid')
 
         # Verify the validity of the eUICC certificate chain
-        cs = CertificateSet(self.ci_get_cert_for_pkid(ss.ci_cert_id))
-        cs.add_intermediate_cert(eum_cert)
-        # TODO v3: otherCertsInChain
         try:
+            cs = CertificateSet(self.ci_get_cert_for_pkid(ss.ci_cert_id))
+            cs.add_intermediate_cert(eum_cert)
+            # TODO v3: otherCertsInChain
             cs.verify_cert_chain(euicc_cert)
-        except VerifyError:
-            raise ApiError('8.1.3', '6.1', 'Verification failed
(certificate chain)')
-        #   raise ApiError('8.1.3', '6.3', 'Expired')
+        except x509_err.MissingIntermediateCert as e:
+            # Check if the missing certificate is the EUM cert
+            if hasattr(e, 'auth_key_id') and e.auth_key_id ==
b2h(cert_get_auth_key_id(eum_cert)):
+                # SGP.22 Table 49: EUM Certificate - Verification Failed
+                raise ApiError('8.1.2', '6.1', 'Certificate is
invalid')
+            else:
+                # SGP.22 Table 49: eUICC Certificate - Verification Failed
+                raise ApiError('8.1.3', '6.1', 'Certificate is
invalid')
+        except x509_err.CertificateRevoked as e:
+            eum_serial = format(eum_cert.serial_number, 'X')
+            euicc_serial = format(euicc_cert.serial_number, 'X')
+
+            if e.cert_serial.upper() == eum_serial.upper():
+                # SGP.22 Table 49: EUM Certificate - Expired (revoked uses expired code)
+                raise ApiError('8.1.2', '6.3', 'Certificate has
expired')
+            elif e.cert_serial.upper() == euicc_serial.upper():
+                # SGP.22 Table 49: eUICC Certificate - Expired (revoked uses expired
code)
+                raise ApiError('8.1.3', '6.3', 'Certificate has
expired')
+        except x509_err.MaxDepthExceeded:
+            # SGP.22 Table 49: eUICC Certificate - Verification Failed
+            raise ApiError('8.1.3', '6.1', 'Certificate is
invalid')
+        except x509_err.SignatureVerification as e:
+            # Check which certificate's signature failed
+            error_str = str(e)
+            if 'EUM' in error_str or 'intermediate' in error_str:
+                # SGP.22 Table 49: EUM Certificate - Verification Failed
+                raise ApiError('8.1.2', '6.1', 'Certificate is
invalid')
+            else:
+                # SGP.22 Table 49: eUICC Certificate - Verification Failed
+                raise ApiError('8.1.3', '6.1', 'Certificate is
invalid')
+        except x509_err.VerifyError as e:
+            # Generic certificate chain error for any other x509_err subclasses
+            error_str = str(e)
+            if 'EUM' in error_str or 'intermediate' in error_str:
+                # SGP.22 Table 49: EUM Certificate - Verification Failed
+                raise ApiError('8.1.2', '6.1', 'Certificate is
invalid')
+            else:
+                # SGP.22 Table 49: eUICC Certificate - Verification Failed
+                raise ApiError('8.1.3', '6.1', 'Certificate is
invalid')
+        except ValueError as e:
+            # This could be raised by add_intermediate_cert for invalid EUM cert
+            if 'intermediate certificate' in str(e):
+                # SGP.22 Table 49: EUM Certificate - Verification Failed
+                raise ApiError('8.1.2', '6.1', 'Certificate is
invalid')
+            # SGP.22 Table 49: eUICC Certificate - Verification Failed
+            raise ApiError('8.1.3', '6.1', 'Certificate is
invalid')
+        except Exception as e:
+            logger.error(f"Certificate chain verification error: {e}")
+            # Check if it's a missing CI certificate issue
+            if 'ci_cert_id' in str(e) or 'Unknown' in str(e):
+                # SGP.22 Table 49: CI Public Key - Unknown
+                raise ApiError('8.11.1', '3.9', 'Unknown CI Public
Key. The CI used by the EUM Certificate is not a trusted root for the SM-DP+')
+            # SGP.22 Table 49: eUICC Certificate - Verification Failed
+            raise ApiError('8.1.3', '6.1', 'Certificate is
invalid')
 
 
         # Verify euiccSignature1 over euiccSigned1 using pubkey from euiccCertificate.
-        # Otherwise, the SM-DP+ SHALL return a status code "eUICC - Verification
failed"
         if not self._ecdsa_verify(euicc_cert, euiccSignature1_bin, euiccSigned1_bin):
-            raise ApiError('8.1', '6.1', 'Verification failed
(euiccSignature1 over euiccSigned1)')
+            # SGP.22 Table 49: eUICC - Verification Failed
+            raise ApiError('8.1', '6.1', 'eUICC signature is invalid
or serverChallenge is invalid')
 
         ss.eid =
ss.euicc_cert.subject.get_attributes_for_oid(x509.oid.NameOID.SERIAL_NUMBER)[0].value
         logger.debug("EID (from eUICC cert): %s" % ss.eid)
 
         # Verify EID is within permitted range of EUM certificate
         if not validate_eid_range(ss.eid, eum_cert):
-            raise ApiError('8.1.4', '6.1', 'EID is not within the
permitted range of the EUM certificate')
+            # Use eUICC Certificate error since EID is from eUICC cert
+            raise ApiError('8.1.3', '6.1', 'Certificate is
invalid')
 
         # Verify that the serverChallenge attached to the ongoing RSP session matches
the
-        # serverChallenge returned by the eUICC. Otherwise, the SM-DP+ SHALL return a
status code "eUICC -
-        # Verification failed".
+        # serverChallenge returned by the eUICC.
         if euiccSigned1['serverChallenge'] != ss.serverChallenge:
-            raise ApiError('8.1', '6.1', 'Verification failed
(serverChallenge)')
+            # SGP.22 Table 49: eUICC - Verification Failed
+            raise ApiError('8.1', '6.1', 'eUICC signature is invalid
or serverChallenge is invalid')
+
+        # Verify that the transactionId in euiccSigned1 matches the outer transactionId
+        if euiccSigned1['transactionId'] != h2b(transactionId):
+            # SGP.22 Table 49: TransactionId - Unknown
+            raise ApiError('8.10.1', '3.9', 'The RSP session
identified by the TransactionID is unknown')
 
         # If ctxParams1 contains a ctxParamsForCommonAuthentication data object, the
SM-DP+ Shall [...]
-        # TODO: We really do a very simplistic job here, this needs to be properly
implemented later,
-        # considering all the various cases, profile state, etc.
         if euiccSigned1['ctxParams1'][0] ==
'ctxParamsForCommonAuthentication':
             cpca = euiccSigned1['ctxParams1'][1]
             matchingId = cpca.get('matchingId', None)
-            if not matchingId:
-                # TODO: check if any pending profile downloads for the EID
-                raise ApiError('8.2.6', '3.8', 'Refused')
-            if matchingId:
-                # look up profile based on matchingID.  We simply check if a given file
exists for now..
-                path = os.path.join(self.upp_dir, matchingId) + '.der'
-                # prevent directory traversal attack
-                if os.path.commonprefix((os.path.realpath(path),self.upp_dir)) !=
self.upp_dir:
-                    raise ApiError('8.2.6', '3.8', 'Refused')
-                if not os.path.isfile(path) or not os.access(path, os.R_OK):
-                    raise ApiError('8.2.6', '3.8', 'Refused')
-                ss.matchingId = matchingId
-                with open(path, 'rb') as f:
-                    pes = saip.ProfileElementSequence.from_der(f.read())
-                    iccid_str =
b2h(pes.get_pe_for_type('header').decoded['iccid'])
+            logger.debug(f"Extracted matchingId from request: {matchingId}")
+
+            # Determine use case and find profile
+            profile_info = None
+            iccid_str = None
+
+            if not matchingId or matchingId == '':
+                # Default SM-DP+ address use case - check if EID has pending profile
+                logger.debug(f"Default SM-DP+ use case for EID: {ss.eid}")
+                if self.test_mode and ss.eid in self.default_profiles:
+                    profile_info = self.default_profiles[ss.eid]
+                    iccid_str = profile_info['iccid']
+                    ss.matchingId = None  # No matchingId for default case
+                elif not self.test_mode:
+                    # In production mode, try to load a default profile from file system
+                    # This is where real implementation would check database/backend
+                    # SGP.22 Table 49: EID - Refused
+                    raise ApiError('8.1.1', '3.8', 'EID doesn\'t
match the expected value')
+                else:
+                    # Test mode but no profile for this EID
+                    # SGP.22 Table 49: EID - Refused
+                    raise ApiError('8.1.1', '3.8', 'EID doesn\'t
match the expected value')
+
+            elif self.test_mode and matchingId.startswith('EVENT_'):
+                # SM-DS event-based use case (test mode only)
+                logger.debug(f"SM-DS event use case with matchingId:
{matchingId}")
+                if matchingId in self.event_based_profiles:
+                    profile_info = self.event_based_profiles[matchingId]
+                    # Check if profile is associated with specific EID
+                    if profile_info.get('associated_eid') and
profile_info['associated_eid'] != ss.eid:
+                        # SGP.22 Table 49: EID - Refused
+                        raise ApiError('8.1.1', '3.8', 'EID
doesn\'t match the expected value')
+                    iccid_str = profile_info['iccid']
+                    ss.matchingId = matchingId
+                else:
+                    # SGP.22 Table 49: MatchingID - Refused
+                    raise ApiError('8.2.6', '3.8', 'MatchingID
(AC_Token or EventID) is refused')
+
+            else:
+                # Activation code use case
+                logger.debug(f"Activation code use case with matchingId:
{matchingId}")
+                logger.debug(f"Available activation codes:
{list(self.activation_code_profiles.keys())}")
+                if self.test_mode and matchingId in self.activation_code_profiles:
+                    profile_info = self.activation_code_profiles[matchingId]
+                    # Check if profile is associated with specific EID
+                    if profile_info.get('associated_eid') and
profile_info['associated_eid'] != ss.eid:
+                        # SGP.22 Table 49: EID - Refused
+                        raise ApiError('8.1.1', '3.8', 'EID
doesn\'t match the expected value')
+                    iccid_str = profile_info['iccid']
+                    ss.matchingId = matchingId
+                else:
+                    path = os.path.join(self.upp_dir, matchingId) + '.der'
+                    # prevent directory traversal attack
+                    if os.path.commonprefix((os.path.realpath(path),self.upp_dir)) !=
self.upp_dir:
+                        # SGP.22 Table 49: MatchingID - Refused
+                        raise ApiError('8.2.6', '3.8', 'MatchingID
(AC_Token or EventID) is refused')
+                    if os.path.isfile(path) and os.access(path, os.R_OK):
+                        with open(path, 'rb') as f:
+                            pes = saip.ProfileElementSequence.from_der(f.read())
+                            iccid_str =
b2h(pes.get_pe_for_type('header').decoded['iccid'])
+                        ss.matchingId = matchingId
+                        # temporary profile info for legacy files
+                        profile_info = {
+                            'confirmationCode':
self.confirmation_codes.get(matchingId),
+                            'state': 'released',
+                            'profileName': matchingId
+                        }
+                    else:
+                        # SGP.22 Table 49: MatchingID - Refused
+                        raise ApiError('8.2.6', '3.8', 'MatchingID
(AC_Token or EventID) is refused')
+
+            # Validate profile state and other conditions
+            if profile_info:
+                # Check if profile is released
+                if profile_info.get('state') == 'not_released':
+                    # SGP.22 Table 49: Profile - Not allowed
+                    raise ApiError('8.2', '1.2', 'Profile has not yet
been released')
+
+                # Check for expired download order
+                if profile_info.get('expiration'):
+                    exp_date =
datetime.fromisoformat(profile_info['expiration'].replace('Z',
'+00:00'))
+                    if datetime.now(timezone.utc) > exp_date:
+                        # SGP.22 Table 49: Download order - Time to Live Expired
+                        raise ApiError('8.8.5', '4.10', 'The Download
order has expired')
+
+                # Check maximum download attempts
+                if profile_info.get('download_attempts', 0) >= 3:
+                    # SGP.22 Table 49: Download order - Maximum number of retries
exceeded
+                    raise ApiError('8.8.5', '6.4', 'The maximum
number of retries for the Profile download order has been exceeded')
+
+                # Check device eligibility (for Test #15 - test mode only)
+                if self.test_mode and profile_info.get('device_requirements'):
+                    # fixme real implementation would check against actual device
capabilities
+                    if
profile_info['device_requirements'].get('min_memory_mb', 0) > 1000:
+                        # SGP.22 Table 49: Profile Type - Stopped on warning
+                        raise ApiError('8.2.5', '4.3', 'No eligible
Profile for this eUICC/Device')
+
+                # Set confirmation code requirement
+                # Special handling: When matchingId is omitted or empty, don't
require confirmation code
+                # per SGP.23 test sequences #14-#18
+                if self.test_mode and (not matchingId or matchingId == ''):
+                    ss.ccRequiredFlag = False
+                    logger.info("ccRequiredFlag=False for omitted/empty matchingId
(default SM-DP+ use case)")
+                elif profile_info.get('confirmationCode'):
+                    ss.ccRequiredFlag = True
+                    ss.expected_confirmation_code =
profile_info['confirmationCode']
+                    logger.info(f"Set ccRequiredFlag=True with code:
{ss.expected_confirmation_code}")
+                else:
+                    ss.ccRequiredFlag = False
+                    logger.info("ccRequiredFlag=False, no confirmation code
required")
+
+                # Use profile name from profile_info if available
+                profile_name = profile_info.get('profileName', matchingId or
'DefaultProfile')
+            else:
+                # Should not happen if all cases are handled above
+                raise ApiError('8.2.6', '3.8', 'Profile not
found')
         else:
             # there's currently no other option in the ctxParams1 choice, so this
cannot happen
             raise ApiError('1.3.1', '2.2', 'ctxParams1 missing
mandatory ctxParamsForCommonAuthentication')
@@ -654,19 +1246,25 @@
         # FIXME: we actually want to perform the profile binding herr, and read the
profile metadat from the profile
 
         # Put together profileMetadata + _bin
-        ss.profileMetadata = ProfileMetadata(iccid_bin=h2b(swap_nibbles(iccid_str)),
spn="OsmocomSPN", profile_name=matchingId)
+        ss.profileMetadata = ProfileMetadata(iccid_bin=h2b(swap_nibbles(iccid_str)),
spn="OsmocomSPN", profile_name=profile_name)
         # enable notifications for all operations
         for event in ['enable', 'disable', 'delete']:
             ss.profileMetadata.add_notification(event, self.server_hostname)
         profileMetadata_bin = ss.profileMetadata.gen_store_metadata_request()
 
         # Put together smdpSigned2 + _bin
+        cc_flag = getattr(ss, 'ccRequiredFlag', False)
+        logger.info(f"Setting ccRequiredFlag in SmdpSigned2: {cc_flag}")
+        logger.info(f"Session state has ccRequiredFlag: {hasattr(ss,
'ccRequiredFlag')}")
+        if hasattr(ss, 'ccRequiredFlag'):
+            logger.info(f"Session ccRequiredFlag value: {ss.ccRequiredFlag}")
         smdpSigned2 = {
             'transactionId': h2b(ss.transactionId),
-            'ccRequiredFlag': False,        # whether the Confirmation Code is
required
+            'ccRequiredFlag': cc_flag,  # whether the Confirmation Code is
required
             #'bppEuiccOtpk': None,           # whether otPK.EUICC.ECKA already
used for binding the BPP, tag '5F49'
             }
         smdpSigned2_bin = rsp.asn1.encode('SmdpSigned2', smdpSigned2)
+        logger.info(f"Encoded smdpSigned2 with ccRequiredFlag={cc_flag}")
 
         ss.smdpSignature2_do = b'\x5f\x37\x40' +
self.dp_pb.ecdsa_sign(smdpSigned2_bin + b'\x5f\x37\x40' + euiccSignature1_bin)
 
@@ -689,6 +1287,7 @@
         # Verify that the received transactionId is known and relates to an ongoing RSP
session
         ss = self.rss.get(transactionId, None)
         if not ss:
+            # SGP.22 Table 51: TransactionId - Unknown
             raise ApiError('8.10.1', '3.9', 'The RSP session
identified by the TransactionID is unknown')
 
         prepDownloadResp_bin = b64decode(content['prepareDownloadResponse'])
@@ -699,7 +1298,9 @@
             r_err = prepDownloadResp[1]
             #r_err['transactionId']
             #r_err['downloadErrorCode']
-            raise ValueError("downloadResponseError %s" % r_err)
+            # Download error from eUICC - use generic eUICC verification failed
+            # SGP.22 Table 51: eUICC - Verification Failed
+            raise ApiError('8.1', '6.1', 'eUICC signature is
invalid')
 
         r_ok = prepDownloadResp[1]
 
@@ -707,11 +1308,13 @@
         euiccSigned2 = r_ok['euiccSigned2']
         euiccSigned2_bin = rsp.extract_euiccSigned2(prepDownloadResp_bin)
         if not self._ecdsa_verify(ss.euicc_cert, r_ok['euiccSignature2'],
euiccSigned2_bin + ss.smdpSignature2_do):
+            # SGP.22 Table 51: eUICC - Verification Failed
             raise ApiError('8.1', '6.1', 'eUICC signature is
invalid')
 
         # not in spec: Verify that signed TransactionID is outer transaction ID
         if h2b(transactionId) != euiccSigned2['transactionId']:
-            raise ApiError('8.10.1', '3.9', 'The signed transactionId
!= outer transactionId')
+            # SGP.22 Table 51: TransactionId - Unknown
+            raise ApiError('8.10.1', '3.9', 'The RSP session
identified by the TransactionID is unknown')
 
         # store otPK.EUICC.ECKA in session state
         ss.euicc_otpk = euiccSigned2['euiccOtpk']
@@ -720,11 +1323,30 @@
         # Generate a one-time ECKA key pair (ot{PK,SK}.DP.ECKA) using the curve indicated
by the Key Parameter
         # Reference value of CERT.DPpb.ECDDSA
         logger.debug("curve = %s" % self.dp_pb.get_curve())
-        ss.smdp_ot = ec.generate_private_key(self.dp_pb.get_curve())
-        # extract the public key in (hopefully) the right format for the ES8+ interface
-        ss.smdp_otpk = ss.smdp_ot.public_key().public_bytes(Encoding.X962,
PublicFormat.UncompressedPoint)
-        logger.debug("smdpOtpk: %s" % b2h(ss.smdp_otpk))
-        logger.debug("smdpOtsk: %s" %
b2h(ss.smdp_ot.private_bytes(Encoding.DER, PrivateFormat.PKCS8, NoEncryption())))
+
+        # Check if we've seen this euicc_otpk before (retry scenario)
+        euicc_otpk_hex = b2h(euiccSigned2['euiccOtpk'])
+        if euicc_otpk_hex in self.otpk_mapping:
+            # Retry scenario - reuse existing keys
+            existing_data = self.otpk_mapping[euicc_otpk_hex]
+            ss.smdp_ot = existing_data['smdp_ot']
+            ss.smdp_otpk = existing_data['smdp_otpk']
+            logger.debug("Retry scenario detected - reusing existing
smdp_otpk")
+            logger.debug("smdpOtpk (reused): %s" % b2h(ss.smdp_otpk))
+        else:
+            # Generate new keys
+            ss.smdp_ot = ec.generate_private_key(self.dp_pb.get_curve())
+            # extract the public key in (hopefully) the right format for the ES8+
interface
+            ss.smdp_otpk = ss.smdp_ot.public_key().public_bytes(Encoding.X962,
PublicFormat.UncompressedPoint)
+            logger.debug("smdpOtpk: %s" % b2h(ss.smdp_otpk))
+            logger.debug("smdpOtsk: %s" %
b2h(ss.smdp_ot.private_bytes(Encoding.DER, PrivateFormat.PKCS8, NoEncryption())))
+
+            # Store the mapping for retry scenarios
+            self.otpk_mapping[euicc_otpk_hex] = {
+                'smdp_ot': ss.smdp_ot,
+                'smdp_otpk': ss.smdp_otpk,
+                'timestamp': time.time()
+            }
 
         ss.host_id = b'mahlzeit'
 
@@ -733,9 +1355,26 @@
         ss.shared_secret = ss.smdp_ot.exchange(ec.ECDH(), euicc_public_key)
         logger.debug("shared_secret: %s" % b2h(ss.shared_secret))
 
-        # TODO: Check if this order requires a Confirmation Code verification
+        # Check if this order requires a Confirmation Code verification
+        if getattr(ss, 'ccRequiredFlag', False):
+            if 'hashCc' not in euiccSigned2:
+                # SGP.22 Table 51: Confirmation Code - Mandatory Element Missing
+                raise ApiError('8.2.7', '2.2', 'Confirmation Code is
missing')
 
-        #  Perform actual protection + binding of profile package (or return  pre-bound
one)
+            received_hash = euiccSigned2['hashCc']
+            expected_hash = compute_confirmation_code_hash(
+                getattr(ss, 'expected_confirmation_code', ''),
+                h2b(transactionId)
+            )
+
+            if received_hash != expected_hash:
+                logger.debug("Confirmation code verification failed")
+                logger.debug(f"Expected hash: {b2h(expected_hash)}")
+                logger.debug(f"Received hash: {b2h(received_hash)}")
+                # SGP.22 Table 51: Confirmation Code - Refused
+                raise ApiError('8.2.7', '3.8', 'Confirmation Code is
refused')
+
+        # Perform actual protection + binding of profile package (or return  pre-bound
one)
         with open(os.path.join(self.upp_dir, ss.matchingId)+'.der', 'rb')
as f:
             upp = UnprotectedProfilePackage.from_der(f.read(),
metadata=ss.profileMetadata)
             # HACK: Use empty PPP as we're still debuggin the configureISDP step, and
we want to avoid
@@ -772,6 +1411,7 @@
             transactionId = b2h(pird['transactionId'])
             ss = self.rss.get(transactionId, None)
             if ss is None:
+                # For unknown transactionId, terminate processing but still return 204
                 logger.warning(f"Unable to find session for transactionId:
{transactionId}")
                 return None  # Will return HTTP 204 with empty body
             profileInstallRes['euiccSignPIR']
@@ -779,7 +1419,9 @@
             pird_bin = rsp.asn1.encode('ProfileInstallationResultData', pird)
             # verify eUICC signature
             if not self._ecdsa_verify(ss.euicc_cert,
profileInstallRes['euiccSignPIR'], pird_bin):
-                raise Exception('ECDSA signature verification failed on
notification')
+                # Even on verification failure, acknowledge receipt with HTTP 204
+                logger.error('ECDSA signature verification failed on
notification')
+                return None  # Will return HTTP 204 with empty body
             logger.debug("Profile Installation Final Result: %s",
pird['finalResult'])
             # remove session state
             del self.rss[transactionId]
@@ -798,7 +1440,9 @@
             cs.verify_cert_chain(euicc_cert)
             tbs_bin = rsp.asn1.encode('NotificationMetadata',
otherSignedNotif['tbsOtherNotification'])
             if not self._ecdsa_verify(euicc_cert,
otherSignedNotif['euiccNotificationSignature'], tbs_bin):
-                raise Exception('ECDSA signature verification failed on
notification')
+                # Even on verification failure, acknowledge receipt with HTTP 204
+                logger.error('ECDSA signature verification failed on
notification')
+                return None  # Will return HTTP 204 with empty body
             other_notif = otherSignedNotif['tbsOtherNotification']
             pmo = PMO.from_bitstring(other_notif['profileManagementOperation'])
             eid =
euicc_cert.subject.get_attributes_for_oid(x509.oid.NameOID.SERIAL_NUMBER)[0].value
@@ -807,7 +1451,9 @@
                 iccid = swap_nibbles(b2h(iccid))
             logger.debug("handleNotification: EID %s: %s of %s" % (eid, pmo,
iccid))
         else:
-            raise ValueError(pendingNotification)
+            # Unknown notification type - still acknowledge with HTTP 204
+            logger.error(f"Unknown notification type:
{pendingNotification[0]}")
+        return None  # Always return HTTP 204 with empty body
 
     #(a)app.route(&#39;/gsma/rsp3/es9plus/handleDeviceChangeRequestuest,
methods=['POST']')
     #@rsp_api_wrapper
@@ -824,7 +1470,8 @@
         # Verify that the received transactionId is known and relates to an ongoing RSP
session
         ss = self.rss.get(transactionId, None)
         if ss is None:
-            raise ApiError('8.10.1', '3.9', 'The RSP session
identified by the transactionId is unknown')
+            # SGP.22 Table 52: TransactionId - Unknown
+            raise ApiError('8.10.1', '3.9', 'The RSP session
identified by the TransactionID is unknown')
 
         cancelSessionResponse_bin = b64decode(content['cancelSessionResponse'])
         cancelSessionResponse = rsp.asn1.decode('CancelSessionResponse',
cancelSessionResponse_bin)
@@ -839,15 +1486,34 @@
         ecsr_bin = rsp.asn1.encode('EuiccCancelSessionSigned', ecsr)
         # Verify the eUICC signature (euiccCancelSessionSignature) using the PK.EUICC.SIG
attached to the ongoing RSP session
         if not self._ecdsa_verify(ss.euicc_cert,
cancelSessionResponseOk['euiccCancelSessionSignature'], ecsr_bin):
+            # SGP.22 Table 52: eUICC - Verification Failed
             raise ApiError('8.1', '6.1', 'eUICC signature is
invalid')
 
         # Verify that the received smdpOid corresponds to the one in SM-DP+
CERT.DPauth.SIG
         subj_alt_name = self.dp_auth.get_subject_alt_name()
-        if x509.ObjectIdentifier(ecsr['smdpOid']) != subj_alt_name.oid:
-            raise ApiError('8.8', '3.10', 'The provided SM-DP+ OID is
invalid.')
+
+        # Extract the SM-DP+ OID from the SubjectAlternativeName extension
+        smdp_oid_from_cert = None
+        for item in subj_alt_name:
+            if isinstance(item, x509.RegisteredID):
+                smdp_oid_from_cert = item.value
+                break
+
+        if not smdp_oid_from_cert:
+            logger.error("No RegisteredID found in SM-DP+ certificate
SubjectAlternativeName")
+            # SGP.22 Table 52: SM-DP+ - Invalid Association
+            raise ApiError('8.8', '3.10', 'The provided SM-DP+ OID is
invalid')
+
+        received_oid = x509.ObjectIdentifier(ecsr['smdpOid'])
+
+        if received_oid != smdp_oid_from_cert:
+            logger.error(f"OID mismatch: received {received_oid}, expected
{smdp_oid_from_cert}")
+            # SGP.22 Table 52: SM-DP+ - Invalid Association
+            raise ApiError('8.8', '3.10', 'The provided SM-DP+ OID is
invalid')
 
         if ecsr['transactionId'] != h2b(transactionId):
-            raise ApiError('8.10.1', '3.9', 'The signed transactionId
!= outer transactionId')
+            # SGP.22 Table 52: TransactionId - Unknown
+            raise ApiError('8.10.1', '3.9', 'The RSP session
identified by the TransactionID is unknown')
 
         # TODO: 1. Notify the Operator using the function
"ES2+.HandleNotification" function
         # TODO: 2. Terminate the corresponding pending download process.
@@ -855,7 +1521,8 @@
 
         # delete actual session data
         del self.rss[transactionId]
-        return { 'transactionId': transactionId }
+        # Per SGP.22 section 6.5.2.10, cancelSession returns an empty response (header
only)
+        return {}
 
 
 def main(argv):
@@ -869,12 +1536,14 @@
                         action='store_true', default=False)
     parser.add_argument("-m", "--in-memory", help="Use ephermal
in-memory session storage (for concurrent runs)",
                         action='store_true', default=False)
+    parser.add_argument("-t", "--test", help="Enable test mode
with hardcoded test profiles",
+                        action='store_true', default=False)
     args = parser.parse_args()
 
     logging.basicConfig(level=logging.DEBUG if args.verbose else logging.WARNING)
 
     common_cert_path = os.path.join(DATA_DIR, args.certdir)
-    hs = SmDppHttpServer(server_hostname=HOSTNAME,
ci_certs_path=os.path.join(common_cert_path, 'CertificateIssuer'),
common_cert_path=common_cert_path, use_brainpool=args.brainpool)
+    hs = SmDppHttpServer(server_hostname=HOSTNAME,
ci_certs_path=os.path.join(common_cert_path, 'CertificateIssuer'),
common_cert_path=common_cert_path, use_brainpool=args.brainpool, test_mode=args.test)
     if(args.nossl):
         hs.app.run(args.host, args.port)
     else:
diff --git a/pySim/esim/x509_cert.py b/pySim/esim/x509_cert.py
index 8139a09..027905d 100644
--- a/pySim/esim/x509_cert.py
+++ b/pySim/esim/x509_cert.py
@@ -25,6 +25,7 @@
 from cryptography.hazmat.primitives.asymmetric.utils import decode_dss_signature
 
 from pySim.utils import b2h
+from . import x509_err
 
 def check_signed(signed: x509.Certificate, signer: x509.Certificate) -> bool:
     """Verify if 'signed' certificate was signed using
'signer'."""
@@ -64,9 +65,6 @@
     id_rspRole_ds_tls_v2 = x509.ObjectIdentifier(ID_RSP_ROLE + '.6')
     id_rspRole_ds_auth_v2 = x509.ObjectIdentifier(ID_RSP_ROLE + '.7')
 
-class VerifyError(Exception):
-    """An error during certificate verification,"""
-
 class CertificateSet:
     """A set of certificates consisting of a trusted [self-signed] CA root
certificate,
     and an optional number of intermediate certificates.  Can be used to verify the
certificate chain
@@ -135,7 +133,7 @@
             # we cannot check if there's no CRL
             return
         if self.crl.get_revoked_certificate_by_serial_number(cert.serial_nr):
-            raise VerifyError('Certificate is present in CRL, verification
failed')
+            raise x509_err.CertificateRevoked(cert.serial_nr)
 
     def verify_cert_chain(self, cert: x509.Certificate, max_depth: int = 100):
         """Verify if a given certificate's signature chain can be
traced back to the root CA of this
@@ -150,13 +148,13 @@
                 return
             parent_cert = self.intermediate_certs.get(aki, None)
             if not parent_cert:
-                raise VerifyError('Could not find intermediate certificate for
AuthKeyId %s' % b2h(aki))
+                raise x509_err.MissingIntermediateCert(b2h(aki))
             check_signed(c, parent_cert)
             # if we reach here, we passed (no exception raised)
             c = parent_cert
             depth += 1
             if depth > max_depth:
-                raise VerifyError('Maximum depth %u exceeded while verifying
certificate chain' % max_depth)
+                raise x509_err.MaxDepthExceeded(max_depth, depth)
 
 
 def ecdsa_dss_to_tr03111(sig: bytes) -> bytes:
diff --git a/pySim/esim/x509_err.py b/pySim/esim/x509_err.py
new file mode 100644
index 0000000..35b4f41
--- /dev/null
+++ b/pySim/esim/x509_err.py
@@ -0,0 +1,58 @@
+"""X.509 certificate verification exceptions for GSMA
eSIM."""
+
+class VerifyError(Exception):
+    """Base class for certificate verification errors."""
+    pass
+
+
+class MissingIntermediateCert(VerifyError):
+    """Raised when an intermediate certificate in the chain cannot be
found."""
+    def __init__(self, auth_key_id: str):
+        self.auth_key_id = auth_key_id
+        super().__init__(f'Could not find intermediate certificate for AuthKeyId
{auth_key_id}')
+
+
+class CertificateRevoked(VerifyError):
+    """Raised when a certificate is found in the CRL."""
+    def __init__(self, cert_serial: str = None):
+        self.cert_serial = cert_serial
+        msg = 'Certificate is present in CRL, verification failed'
+        if cert_serial:
+            msg += f' (serial: {cert_serial})'
+        super().__init__(msg)
+
+
+class MaxDepthExceeded(VerifyError):
+    """Raised when certificate chain depth exceeds the maximum
allowed."""
+    def __init__(self, max_depth: int, actual_depth: int):
+        self.max_depth = max_depth
+        self.actual_depth = actual_depth
+        super().__init__(f'Maximum depth {max_depth} exceeded while verifying
certificate chain (actual: {actual_depth})')
+
+
+class SignatureVerification(VerifyError):
+    """Raised when certificate signature verification
fails."""
+    def __init__(self, cert_subject: str = None, signer_subject: str = None):
+        self.cert_subject = cert_subject
+        self.signer_subject = signer_subject
+        msg = 'Certificate signature verification failed'
+        if cert_subject and signer_subject:
+            msg += f': {cert_subject} not signed by {signer_subject}'
+        super().__init__(msg)
+
+
+class InvalidCertificate(VerifyError):
+    """Raised when a certificate is invalid (missing required fields,
wrong type, etc)."""
+    def __init__(self, reason: str):
+        self.reason = reason
+        super().__init__(f'Invalid certificate: {reason}')
+
+
+class CertificateExpired(VerifyError):
+    """Raised when a certificate has expired."""
+    def __init__(self, cert_subject: str = None):
+        self.cert_subject = cert_subject
+        msg = 'Certificate has expired'
+        if cert_subject:
+            msg += f': {cert_subject}'
+        super().__init__(msg)
\ No newline at end of file

-- 
To view, visit https://gerrit.osmocom.org/c/pysim/+/40880?usp=email
To unsubscribe, or for help writing mail filters, visit
https://gerrit.osmocom.org/settings?usp=email

Gerrit-MessageType: newchange
Gerrit-Project: pysim
Gerrit-Branch: master
Gerrit-Change-Id: I7b22fe4eecb41d0f98e28a1d9390cd7fc8c5784c
Gerrit-Change-Number: 40880
Gerrit-PatchSet: 1
Gerrit-Owner: Hoernchen &lt;ewild(a)sysmocom.de&gt;



    

2025

2024

2023

2022

[L] Change in pysim[master]: smdpp: cc support, proper checks, proper check order, test mode