# Implementation of SimAlliance/TCA Interoperable Profile handling # # (C) 2023-2024 by Harald Welte # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU Affero General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU Affero General Public License for more details. # # You should have received a copy of the GNU Affero General Public License # along with this program. If not, see . import abc import io from typing import Tuple, List, Optional, Dict, Union from collections import OrderedDict import asn1tools from pySim.utils import bertlv_parse_tag, bertlv_parse_len, b2h, h2b, dec_imsi, Hexstr from pySim.ts_102_221 import FileDescriptor from pySim.filesystem import CardADF from pySim.ts_31_102 import ADF_USIM from pySim.ts_31_103 import ADF_ISIM from pySim.construct import build_construct from pySim.esim import compile_asn1_subdir from pySim.esim.saip import templates from pySim.esim.saip import oid from pySim.tlv import BER_TLV_IE from pySim.global_platform import KeyType, KeyUsageQualifier from pySim.global_platform.uicc import UiccSdInstallParams asn1 = compile_asn1_subdir('saip') class Naa: """A class defining a Network Access Application (NAA).""" name = None # AID prefix, as used for ADF and EF.DIR aid = None # the ProfileElement types used specifically in this NAA pe_types = [] # we only use the base DN of each OID; there may be subsequent versions underneath it templates = [] mandatory_services = [] adf: CardADF = None @classmethod def adf_name(cls): return 'adf-' + cls.mandatory_services[0] class NaaCsim(Naa): name = "csim" aid = h2b("") mandatory_services = ["csim"] pe_types = ["csim", "opt-csim", "cdmaParameter"] templates = [oid.ADF_CSIM_by_default, oid.ADF_CSIMopt_not_by_default] class NaaUsim(Naa): name = "usim" aid = h2b("a0000000871002") mandatory_services = ["usim"] pe_types = ["usim", "opt-usim"] templates = [oid.ADF_USIM_by_default, oid.ADF_USIMopt_not_by_default, oid.DF_PHONEBOOK_ADF_USIM, oid.DF_GSM_ACCESS_ADF_USIM, oid.DF_EAP, oid.DF_5GS, oid.DF_SAIP, oid.DF_SNPN, oid.DF_5GProSe] adf = ADF_USIM() class NaaIsim(Naa): name = "isim" aid = h2b("a0000000871004") mandatory_services = ["isim"] pe_types = ["isim", "opt-isim"] templates = [oid.ADF_ISIM_by_default, oid.ADF_ISIMopt_not_by_default] adf = ADF_ISIM() NAAs = { NaaCsim.name: NaaCsim, NaaUsim.name: NaaUsim, NaaIsim.name: NaaIsim, } class File: """Internal representation of a file in a profile filesystem. Parameters: pename: Name string of the profile element l: List of tuples [fileDescriptor, fillFileContent, fillFileOffset profile elements] template: Applicable FileTemplate describing defaults as per SAIP spec """ def __init__(self, pename: str, l: Optional[List[Tuple]] = None, template: Optional[templates.FileTemplate] = None): self.pe_name = pename self.template = template self.fileDescriptor = {} self.stream = None # apply some defaults from profile if self.template: self.from_template(self.template) if l: self.from_tuples(l) def _encode_file_size(self, size: int) -> bytes: # FIXME: handle > v2.0 case where it must be encoded on the minimum number of octets possible return size.to_bytes(2, 'big') def from_template(self, template: templates.FileTemplate): """Determine defaults for file based on given FileTemplate.""" fdb_dec = {} pefi = {} self.rec_len = None if template.fid: self.fileDescriptor['fileID'] = template.fid.to_bytes(2, 'big') if template.sfi: self.fileDescriptor['shortEFID'] = bytes([template.sfi]) if template.arr: self.fileDescriptor['securityAttributesReferenced'] = bytes([template.arr]) # All the files defined in the templates shall have, by default, shareable/not-shareable bit in the file descriptor set to "shareable". fdb_dec['shareable'] = True if template.file_type in ['LF', 'CY']: fdb_dec['file_type'] = 'working_ef' if template.rec_len: self.record_len = template.rec_len if template.nb_rec and template.rec_len: self.fileDescriptor['efFileSize'] = self._encode_file_size(template.nb_rec * template.rec_len) if template.file_type == 'LF': fdb_dec['structure'] = 'linear_fixed' elif template.file_type == 'CY': fdb_dec['structure'] = 'cyclic' elif template.file_type == 'BT': fdb_dec['file_type'] = 'working_ef' fdb_dec['structure'] = 'ber_tlv' if template.file_size: pefi['maximumFileSize'] = self._encode_file_size(template.file_size) elif template.file_type == 'TR': fdb_dec['file_type'] = 'working_ef' fdb_dec['structure'] = 'transparent' if template.file_size: self.fileDescriptor['efFileSize'] = self._encode_file_size(template.file_size) elif template.file_type in ['MF', 'DF', 'ADF']: fdb_dec['file_type'] = 'df' fdb_dec['structure'] = 'no_info_given' # build file descriptor based on above input data fd_dict = {'file_descriptor_byte': fdb_dec} if self.rec_len: fd_dict['record_len'] = self.rec_len self.fileDescriptor['fileDescriptor'] = build_construct(FileDescriptor._construct, fd_dict) if template.high_update: pefi['specialFileInformation'] = b'\x80' # TS 102 222 Table 5 try: if template.default_val_repeat: pefi['repeatPattern'] = template.expand_default_value_pattern() elif template.default_val: pefi['fillPattern'] = template.expand_default_value_pattern() except ValueError: # ignore this here as without a file or record length we cannot do this pass if len(pefi.keys()): self.fileDescriptor['proprietaryEFInfo'] = pefi def from_tuples(self, l:List[Tuple]): """Parse a list of fileDescriptor, fillFileContent, fillFileOffset tuples into this instance.""" def get_fileDescriptor(l:List[Tuple]): for k, v in l: if k == 'fileDescriptor': return v fd = get_fileDescriptor(l) if not fd and not self.fileDescriptor: raise ValueError("No fileDescriptor found in tuple, and none set by template before") if fd: self.fileDescriptor.update(dict(fd)) self.stream = self.linearize_file_content(l) def from_gfm(self, d: Dict): print(d) # FIXME def to_tuples(self) -> List[Tuple]: """Generate a list of fileDescriptor, fillFileContent, fillFileOffset tuples into this instance.""" raise NotImplementedError @staticmethod def linearize_file_content(l: List[Tuple]) -> Optional[io.BytesIO]: """linearize a list of fillFileContent / fillFileOffset tuples into a stream of bytes.""" stream = io.BytesIO() for k, v in l: if k == 'doNotCreate': return None if k == 'fileDescriptor': pass elif k == 'fillFileOffset': stream.write(b'\xff' * v) elif k == 'fillFileContent': stream.write(v) else: return ValueError("Unknown key '%s' in tuple list" % k) return stream def __str__(self) -> str: return "File(%s)" % self.pe_name def __repr__(self) -> str: return "File(%s): %s" % (self.pe_name, self.fileDescriptor) class ProfileElement: """Class representing a Profile Element (PE) within a SAIP Profile.""" FILE_BEARING = ['mf', 'cd', 'telecom', 'usim', 'opt-usim', 'isim', 'opt-isim', 'phonebook', 'gsm-access', 'csim', 'opt-csim', 'eap', 'df-5gs', 'df-saip', 'df-snpn', 'df-5gprose', 'iot', 'opt-iot'] # in their infinite wisdom the spec authors used inconsistent/irregular naming of PE type vs. hedaer field # names, so we have to manually translate the exceptions here... header_name_translation_dict = { 'header': None, 'end': 'end-header', 'genericFileManagement': 'gfm-header', 'akaParameter': 'aka-header', 'cdmaParameter': 'cdma-header', # note how they couldn't even consistently captialize the 'header' suffix :( 'application': 'app-Header', 'pukCodes': 'puk-Header', 'pinCodes': 'pin-Header', 'securityDomain': 'sd-Header', } def __init__(self, decoded = None, mandated: bool = True): if decoded: self.decoded = decoded else: self.decoded = OrderedDict() if self.header_name: self.decoded[self.header_name] = { 'identification': None} if mandated: self.decoded[self.header_name] = { 'mandated': None} @property def header_name(self) -> str: """Return the name of the header field within the profile element.""" # unneccessarry compliaction by inconsistent naming :( if self.type.startswith('opt-'): return self.type.replace('-','') + '-header' if self.type in self.header_name_translation_dict: return self.header_name_translation_dict[self.type] return self.type + '-header' @property def header(self): """Return the decoded ProfileHeader.""" return self.decoded.get(self.header_name, None) @property def identification(self): if self.header: return self.header['identification'] else: return None @property def templateID(self): """Return the decoded templateID used by this profile element (if any).""" return self.decoded.get('templateID', None) @classmethod def class_for_petype(cls, pe_type: str) -> Optional['ProfileElement']: """Return the subclass implementing the given pe-type string.""" class4petype = { # use same order as ASN.1 source definition of "ProfileElement ::= CHOICE {" 'header': ProfileElementHeader, 'genericFileManagement': ProfileElementGFM, 'pinCodes': ProfileElementPin, 'pukCodes': ProfileElementPuk, 'akaParameter': ProfileElementAKA, # TODO: cdmaParameter 'securityDomain': ProfileElementSD, # TODO: rfm # TODO: application # TODO: nonStandard 'end': ProfileElementEnd, 'mf': ProfileElementMF, # TODO: cd 'telecom': ProfileElementTelecom, 'usim': ProfileElementUSIM, 'opt-usim': ProfileElementOptUSIM, 'isim': ProfileElementISIM, 'opt-isim': ProfileElementOptISIM, 'phonebook': ProfileElementPhonebook, 'gsm-access': ProfileElementGsmAccess, # TODO: csim # TODO: opt-csim 'eap': ProfileElementEAP, 'df-5gs': ProfileElementDf5GS, 'df-saip': ProfileElementDfSAIP, 'df-snpn': ProfileElementDfSNPN, 'df-5gprose': ProfileElementDf5GProSe, } if pe_type in class4petype: return class4petype[pe_type] else: return None @classmethod def from_der(cls, der: bytes) -> 'ProfileElement': """Construct an instance from given raw, DER encoded bytes.""" pe_type, decoded = asn1.decode('ProfileElement', der) pe_cls = cls.class_for_petype(pe_type) if pe_cls: inst = pe_cls(decoded) else: inst = ProfileElement(decoded) inst.type = pe_type # run any post-decoder a derived class may have if hasattr(inst, '_post_decode'): inst._post_decode() return inst def to_der(self) -> bytes: """Build an encoded DER representation of the instance.""" # run any pre-encoder a derived class may have if hasattr(self, '_pre_encode'): self._pre_encode() return asn1.encode('ProfileElement', (self.type, self.decoded)) def __str__(self) -> str: return self.type class FsProfileElement(ProfileElement): """A file-system bearing profile element, like MF, USIM, ....""" def __init__(self, decoded = None, mandated: bool = True): super().__init__(decoded, mandated) # indexed by PE-Name self.files = {} self.tdef = asn1.types['ProfileElement'].type.name_to_member[self.type] def add_file(self, file: File): """Add a File to the ProfileElement.""" if file.pe_name in self.files: raise KeyError('Cannot add file: %s already exists' % file.pename) self.files[file.pe_name] = file def files2pe(self): """Update the "decoded" member with the contents of the files member.""" for f in self.files: self.decoded[f.pename] = f.to_tuples() def pe2files(self): """Update the "files" member with the contents of the "decoded" member.""" tdict = {x.name: x for x in self.tdef.root_members} template = templates.ProfileTemplateRegistry.get_by_oid(self.templateID) for k, v in self.decoded.items(): if tdict[k].type_name == 'File': self.add_file(File(k, v, template.files_by_pename.get(k, None))) def _post_decode(self): # not entirely sure about this automatism self.pe2files() def _pre_encode(self): # should we do self.pe2files()? I don't think so #self.files2pe() pass class ProfileElementGFM(ProfileElement): type = 'genericFileManagement' def __init__(self, decoded = None, mandated: bool = True): super().__init__(decoded, mandated) # indexed by PE-Name self.files = {} self.tdef = asn1.types['ProfileElement'].type.name_to_member[self.type] def add_file(self, path, file: File): # FIXME: proper FS hiearchy #if path in self.files: # raise KeyError('Cannot add file: path %s already exists' % path) self.files[path] = file def pe2files(self): """Update the "files" member with the contents of the "decoded" member.""" def perform(self, path, file_elements): if len(file_elements): file = File('', file_elements) self.add_file(path, file) path = "3f00" # current DF: MF file_elements = [] # looks like TCA added one level too much in the ASN.1 hierarchy here for fmc in self.decoded['fileManagementCMD']: for fmc2 in fmc: if fmc2[0] == 'filePath': # selecting a new path means we're done with the previous file perform(self, path, file_elements) if fmc2[1] == "": path = "3f00" else: # FIXME pass elif fmc2[0] == 'createFCP': # new FCP means new file; perform the old one perform(self, path, file_elements) file_elements = [('fileDescriptor', fmc2[1])] elif fmc2[0] == 'fillFileOffset' or fmc2[0] == 'fillFileContent': file_elements.append(fmc2) else: raise ValueError("Unknown GFM choice '%s'" % fmc2[0]) # add the last file, if we still have any pending data in file_elements perform(self, path, file_elements) def _post_decode(self): # not entirely sure about this automatism self.pe2files() class ProfileElementMF(FsProfileElement): type = 'mf' def __init__(self, decoded: Optional[dict] = None): super().__init__(decoded) if decoded: return # provide some reasonable defaults self.decoded['templateID'] = str(oid.MF) for fname in ['mf', 'ef-iccid', 'ef-dir', 'ef-arr']: self.decoded[fname] = [] # TODO: resize EF.DIR? class ProfileElementPuk(ProfileElement): type = 'pukCodes' def __init__(self, decoded: Optional[dict] = None): super().__init__(decoded) if decoded: return # provide some reasonable defaults self.decoded['pukCodes'] = [] self.add_puk(0x01, b'11111111') self.add_puk(0x81, b'22222222') def add_puk(self, key_ref: int, puk_value: bytes, max_attempts:int = 10, retries_left:int = 10): """Add a PUK to the pukCodes ProfileElement""" if key_ref < 0 or key_ref > 0xff: raise ValueError('key_ref must be uint8') if len(puk_value) != 8: raise ValueError('puk_value must be 8 bytes long') if max_attempts < 0 or max_attempts > 0xf: raise ValueError('max_attempts must be 4 bit') if retries_left < 0 or max_attempts > 0xf: raise ValueError('retries_left must be 4 bit') puk = { 'keyReference': key_ref, 'pukValue': puk_value, 'maxNumOfAttemps-retryNumLeft': (max_attempts << 4) | retries_left, } self.decoded['pukCodes'].append(puk) class ProfileElementPin(ProfileElement): type = 'pinCodes' def __init__(self, decoded: Optional[dict] = None): super().__init__(decoded) if decoded: return # provide some reasonable defaults self.decoded['pinCodes'] = ('pinconfig', []) self.add_pin(0x01, b'0000\xff\xff\xff\xff', unblock_ref=1, pin_attrib=6) self.add_pin(0x10, b'11111111', pin_attrib=3) def add_pin(self, key_ref: int, pin_value: bytes, max_attempts : int = 3, retries_left : int = 3, unblock_ref: Optional[int] = None, pin_attrib: int = 7): """Add a PIN to the pinCodes ProfileElement""" if key_ref < 0 or key_ref > 0xff: raise ValueError('key_ref must be uint8') if pin_attrib < 0 or pin_attrib > 0xff: raise ValueError('pin_attrib must be uint8') if len(pin_value) != 8: raise ValueError('pin_value must be 8 bytes long') if max_attempts < 0 or max_attempts > 0xf: raise ValueError('max_attempts must be 4 bit') if retries_left < 0 or max_attempts > 0xf: raise ValueError('retries_left must be 4 bit') pin = { 'keyReference': key_ref, 'pinValue': pin_value, 'maxNumOfAttemps-retryNumLeft': (max_attempts << 4) | retries_left, 'pinAttributes': pin_attrib, } if unblock_ref: pin['unblockingPINReference'] = unblock_ref self.decoded['pinCodes'][1].append(pin) class ProfileElementTelecom(FsProfileElement): type = 'telecom' def __init__(self, decoded: Optional[dict] = None): super().__init__(decoded) if decoded: return # provide some reasonable defaults for a MNO-SD self.decoded['templateID'] = str(oid.DF_TELECOM_v2) for fname in ['df-telecom', 'ef-arr']: self.decoded[fname] = [] class ProfileElementPhonebook(FsProfileElement): type = 'phonebook' def __init__(self, decoded: Optional[dict] = None): super().__init__(decoded) if decoded: return # provide some reasonable defaults self.decoded['templateID'] = str(oid.DF_PHONEBOOK_ADF_USIM) for fname in ['df-phonebook']: self.decoded[fname] = [] class ProfileElementGsmAccess(FsProfileElement): type = 'gsm-access' def __init__(self, decoded: Optional[dict] = None): super().__init__(decoded) if decoded: return # provide some reasonable defaults self.decoded['templateID'] = str(oid.DF_GSM_ACCESS_ADF_USIM) for fname in ['df-gsm-access']: self.decoded[fname] = [] class ProfileElementDf5GS(FsProfileElement): type = 'df-5gs' def __init__(self, decoded: Optional[dict] = None): super().__init__(decoded) if decoded: return # provide some reasonable defaults self.decoded['templateID'] = str(oid.DF_5GS_v3) for fname in ['df-5gs']: self.decoded[fname] = [] class ProfileElementEAP(FsProfileElement): type = 'eap' def __init__(self, decoded: Optional[dict] = None): super().__init__(decoded) if decoded: return # provide some reasonable defaults self.decoded['templateID'] = str(oid.DF_EAP) for fname in ['df-eap', 'ef-eapstatus']: self.decoded[fname] = [] class ProfileElementDfSAIP(FsProfileElement): type = 'df-saip' def __init__(self, decoded: Optional[dict] = None): super().__init__(decoded) if decoded: return # provide some reasonable defaults self.decoded['templateID'] = str(oid.DF_SAIP) for fname in ['df-saip']: self.decoded[fname] = [] class ProfileElementDfSNPN(FsProfileElement): type = 'df-snpn' def __init__(self, decoded: Optional[dict] = None): super().__init__(decoded) if decoded: return # provide some reasonable defaults self.decoded['templateID'] = str(oid.DF_SNPN) for fname in ['df-snpn']: self.decoded[fname] = [] class ProfileElementDf5GProSe(FsProfileElement): type = 'df-5gprose' def __init__(self, decoded: Optional[dict] = None): super().__init__(decoded) if decoded: return # provide some reasonable defaults self.decoded['templateID'] = str(oid.DF_5GProSe) for fname in ['df-df-5g-prose']: self.decoded[fname] = [] class SecurityDomainKeyComponent: """Representation of a key-component of a key for a security domain.""" def __init__(self, key_type: str, key_data: bytes, mac_length: int = 8): self.key_type = key_type self.key_data = key_data self.mac_length = mac_length def __repr__(self) -> str: return 'SdKeyComp(type=%s, mac_len=%u, data=%s)' % (self.key_type, self.mac_length, b2h(self.key_data)) @classmethod def from_saip_dict(cls, saip: dict) -> 'SecurityDomainKeyComponent': """Construct instance from the dict as generated by SAIP asn.1 decoder.""" return cls(KeyType.parse(saip['keyType']), saip['keyData'], saip['macLength']) def to_saip_dict(self) -> dict: """Express instance in the dict format required by SAIP asn.1 encoder.""" return {'keyType': KeyType.build(self.key_type), 'keyData': self.key_data, 'macLength': self.mac_length} class SecurityDomainKey: """Represenation of a key used for SCP access to a security domain.""" def __init__(self, key_version_number: int, key_id: int, key_usage_qualifier: dict, key_components: List[SecurityDomainKeyComponent]): self.key_usage_qualifier = key_usage_qualifier self.key_identifier = key_id self.key_version_number = key_version_number self.key_components = key_components def __repr__(self) -> str: return 'SdKey(KVN=0x%02x, ID=0x%02x, Usage=%s, Comp=%s)' % (self.key_version_number, self.key_identifier, self.key_usage_qualifier, repr(self.key_components)) @classmethod def from_saip_dict(cls, saip: dict) -> 'SecurityDomainKey': """Construct instance from the dict as generated by SAIP asn.1 decoder.""" inst = cls(int.from_bytes(saip['keyVersionNumber'], "big"), int.from_bytes(saip['keyIdentifier'], "big"), KeyUsageQualifier.parse(saip['keyUsageQualifier']), [SecurityDomainKeyComponent.from_saip_dict(x) for x in saip['keyComponents']]) return inst def to_saip_dict(self) -> dict: """Express instance in the dict format required by SAIP asn.1 encoder.""" return {'keyUsageQualifier': KeyUsageQualifier.build(self.key_usage_qualifier), 'keyIdentifier': bytes([self.key_identifier]), 'keyVersionNumber': bytes([self.key_version_number]), 'keyComponents': [k.to_saip_dict() for k in self.key_components]} class ProfileElementSD(ProfileElement): """Class representing a securityDomain ProfileElement.""" type = 'securityDomain' class C9(BER_TLV_IE, tag=0xC9, nested=UiccSdInstallParams): pass def __init__(self, decoded: Optional[dict] = None): super().__init__(decoded) if decoded: return # provide some reasonable defaults for a MNO-SD self.decoded['instance'] = { 'applicationLoadPackageAID': h2b('A0000001515350'), 'classAID': h2b('A000000251535041'), 'instanceAID': h2b('A000000151000000'), # Optional: extraditeSecurityDomainAID 'applicationPrivileges': h2b('82FC80'), # Optioal: lifeCycleState 'applicationSpecificParametersC9': h2b('8201f09301f08701f0'), # we assume user uses add_scp() # Optional: systemSpecificParameters 'applicationParameters': { # TAR: B20100, MSL: 12 'uiccToolkitApplicationSpecificParametersField': h2b('0100000100000002011203B2010000'), }, # Optional: processData # Optional: controlReferenceTemplate } self.decoded['keyList'] = [] # we assume user uses add_key() method for all keys # Optional: sdPersoData # Optional: openPersoData # Optional: catTpParameters self._post_decode() def _post_decode(self): self.usip = self.C9() self.usip.from_bytes(self.decoded['instance']['applicationSpecificParametersC9']) self.keys = [SecurityDomainKey.from_saip_dict(x) for x in self.decoded['keyList']] def _pre_encode(self): self.decoded['keyList'] = [x.to_saip_dict() for x in self.keys] self.decoded['instance']['applicationSpecificParametersC9'] = self.usip.to_bytes() def has_scp(self, scp: int) -> bool: """Determine if SD Installation parameters already specify given SCP.""" return self.usip.nested_collection.has_scp(scp) def add_scp(self, scp: int, i: int): """Add given SCP (and i parameter) to list of SCP of the Security Domain Install Params. Example: add_scp(0x03, 0x70) for SCP03, or add_scp(0x02, 0x55) for SCP02.""" self.usip.nested_collection.add_scp(scp, i) self._pre_encode() def remove_scp(self, scp: int): """Remove given SCP from list of SCP of the Security Domain Install Params.""" self.usip.nested_collection.remove_scp(scp) self._pre_encode() def find_key(self, key_version_number: int, key_id: int) -> Optional[SecurityDomainKey]: """Find and return (if any) the SecurityDomainKey for given KVN + KID.""" for k in self.keys: if k.key_version_number == key_version_number and k.key_identifier == key_id: return k return None def add_key(self, key: SecurityDomainKey): """Add a given SecurityDomainKey to the keyList of the securityDomain.""" if self.find_key(key.key_version_number, key.key_identifier): raise ValueError('Key for KVN=0x%02x / KID=0x%02x already exists' % (key.key_version_number, key.key_identifier)) self.keys.append(key) self._pre_encode() def remove_key(self, key_version_number: int, key_id: int): key = self.find_key(key_version_number, key_id) if not key: raise ValueError('No key for KVN=0x%02x / KID=0x%02x found' % (key_version_number, key_id)) self.keys.remove(key) self._pre_encode() class ProfileElementSSD(ProfileElementSD): """Class representing a securityDomain ProfileElement for a SSD.""" def __init__(self, decoded: Optional[dict] = None): super().__init__(decoded) if decoded: return # defaults [overriding ProfileElementSD) taken from SAIP v2.3.1 Section 11.2.12 self.decoded['instance']['instanceAID'] = h2b('A00000055910100102736456616C7565') self.decoded['instance']['applicationPrivileges'] = h2b('808000') self.decoded['instance']['applicationParameters'] = { # TAR: 6C7565, MSL: 12 'uiccToolkitApplicationSpecificParametersField': h2b('01000001000000020112036C756500'), } class ProfileElementRFM(ProfileElement): type = 'rfm' def __init__(self, decoded: Optional[dict] = None, inst_aid: Optional[bytes] = None, sd_aid: Optional[bytes] = None, adf_aid: Optional[bytes] = None, tar_list: Optional[List[bytes]] = [], msl: Optional[int] = 0x06): super().__init__(decoded) ADM1_ACCESS = h2b('02000100') if decoded: return # provide some reasonable defaults for a MNO-SD self.decoded['instanceAID'] = inst_aid self.decoded['securityDomainAID'] = sd_aid self.decoded['tarList'] = tar_list self.decoded['minimumSecurityLevel'] = bytes([msl]) self.decoded['uiccAccessDomain'] = ADM1_ACCESS self.decoded['uiccAdminAccessDomain'] = ADM1_ACCESS if adf_aid: self.decoded['adfRFMAccess'] = { 'adfAID': adf_aid, 'adfAccessDomain': ADM1_ACCESS, 'adfAdminAccessDomain': ADM1_ACCESS, } class ProfileElementUSIM(FsProfileElement): type = 'usim' def __init__(self, decoded: Optional[dict] = None): super().__init__(decoded) if decoded: return # provide some reasonable defaults for a MNO-SD self.decoded['templateID'] = str(oid.ADF_USIM_by_default_v2) for fname in ['adf-usim', 'ef-imsi', 'ef-arr', 'ef-ust', 'ef-spn', 'ef-est', 'ef-acc', 'ef-ecc']: self.decoded[fname] = [] @property def adf_name(self) -> str: return b2h(self.decoded['adf-usim'][0][1]['dfName']) @property def imsi(self) -> Optional[str]: f = File('ef-imsi', self.decoded['ef-imsi']) return dec_imsi(b2h(f.stream.getvalue())) class ProfileElementOptUSIM(FsProfileElement): type = 'opt-usim' def __init__(self, decoded: Optional[dict] = None): super().__init__(decoded) if decoded: return # provide some reasonable defaults for a MNO-SD self.decoded['templateID'] = str(oid.ADF_USIMopt_not_by_default_v2) class ProfileElementISIM(FsProfileElement): type = 'isim' def __init__(self, decoded: Optional[dict] = None): super().__init__(decoded) if decoded: return # provide some reasonable defaults for a MNO-SD self.decoded['templateID'] = str(oid.ADF_ISIM_by_default) for fname in ['adf-isim', 'ef-impi', 'ef-impu', 'ef-domain', 'ef-ist', 'ef-arr']: self.decoded[fname] = [] @property def adf_name(self) -> str: return b2h(self.decoded['adf-isim'][0][1]['dfName']) class ProfileElementOptISIM(FsProfileElement): type = 'opt-isim' def __init__(self, decoded: Optional[dict] = None): super().__init__(decoded) if decoded: return # provide some reasonable defaults for a MNO-SD self.decoded['templateID'] = str(oid.ADF_ISIMopt_not_by_default_v2) class ProfileElementAKA(ProfileElement): type = 'akaParameter' def __init__(self, decoded: Optional[dict] = None): super().__init__(decoded) if decoded: return # provide some reasonable defaults for a MNO-SD self.set_milenage(b'\x00'*16, b'\x00'*16) def _fixup_sqnInit_dec(self) -> None: """asn1tools has a bug when working with SEQUENCE OF that have DEFAULT values. Let's work around this.""" sqn_init = self.decoded.get('sqnInit', None) if not sqn_init: return # this weird '0x' value in a string is what we get from our (slightly hacked) ASN.1 syntax if sqn_init == '0x000000000000': # SEQUENCE (SIZE (32)) OF OCTET STRING (SIZE (6)) self.decoded['sqnInit'] = [b'\x00'*6] * 32 def _fixup_sqnInit_enc(self) -> None: """asn1tools has a bug when working with SEQUENCE OF that have DEFAULT values. Let's work around this.""" sqn_init = self.decoded.get('sqnInit', None) if not sqn_init: return for s in sqn_init: if any(s): return # none of the fields were initialized with a non-default (non-zero) value, so we can skip it del self.decoded['sqnInit'] def _post_decode(self): # work around asn1tools bug regarding DEFAULT for a SEQUENCE OF self._fixup_sqnInit_dec() def _pre_encode(self): # work around asn1tools bug regarding DEFAULT for a SEQUENCE OF self._fixup_sqnInit_enc() def set_milenage(self, k: bytes, opc: bytes): """Configure akaParametes for MILENAGE.""" self.decoded['algoConfiguration'] = ('algoParameter', { 'algorithmID': 1, 'algorithmOptions': b'\x00', # not relevant for milenage 'key': k, 'opc': opc, }) def set_xor3g(self, k: bytes): """Configure akaParametes for XOR-3G.""" self.decoded['algoConfiguration'] = ('algoParameter', { 'algorithmID': 3, 'algorithmOptions': b'\x00', # not relevant for milenage 'key': k, 'opc': b'', # not used for MILENAGE }) def set_tuak(self, k: bytes, topc: bytes, num_of_keccak: int = 1): """Configure akaParametes for TUAK.""" self.decoded['algoConfiguration'] = ('algoParameter', { 'algorithmID': 2, 'algorithmOptions': b'\x00', # not relevant for milenage 'key': k, 'opc': topc, 'numberOfKeccak': bytes([num_of_keccak]), }) def set_mapping(self, aid: bytes, options: int = 6): """Configure akaParametes for a mapping from another AID.""" self.decoded['algoConfiguration'] = ('mappingParamete', { 'mappingOptions': bytes([options]), 'mappingSource': aid, }) class ProfileElementHeader(ProfileElement): type = 'header' def __init__(self, decoded: Optional[dict] = None, ver_major: Optional[int] = 2, ver_minor: Optional[int] = 3, iccid: Optional[Hexstr] = '0'*20, profile_type: Optional[str] = None): super().__init__(decoded) if decoded: return # provide some reasonable defaults self.decoded = { 'major-version': ver_major, 'minor-version': ver_minor, 'iccid': h2b(iccid), 'eUICC-Mandatory-services': {}, # needs to be recomputed at the end 'eUICC-Mandatory-GFSTEList': [], # needs to be recomputed at the end } if profile_type: self.decoded['profileType'] = profile_type class ProfileElementEnd(ProfileElement): type = 'end' def __init__(self, decoded: Optional[dict] = None): super().__init__(decoded) def bertlv_first_segment(binary: bytes) -> Tuple[bytes, bytes]: """obtain the first segment of a binary concatenation of BER-TLV objects. Returns: tuple of first TLV and remainder.""" _tagdict, remainder = bertlv_parse_tag(binary) length, remainder = bertlv_parse_len(remainder) tl_length = len(binary) - len(remainder) tlv_length = tl_length + length return binary[:tlv_length], binary[tlv_length:] class ProfileElementSequence: """A sequence of ProfileElement objects, which is the overall representation of an eSIM profile.""" def __init__(self): self.pe_list: List[ProfileElement] = [] self.pe_by_type: Dict = {} self.pes_by_naa: Dict = {} def append(self, pe: ProfileElement): """Append a PE to the PE Sequence""" self.pe_list.append(pe) self._process_pelist() self.renumber_identification() def get_pes_for_type(self, tname: str) -> List[ProfileElement]: """Return list of profile elements present for given profile element type.""" return self.pe_by_type.get(tname, []) def get_pe_for_type(self, tname: str) -> Optional[ProfileElement]: """Return a single profile element for given profile element type. Works only for types of which there is only a signle instance in the PE Sequence!""" l = self.get_pes_for_type(tname) if len(l) == 0: return None assert len(l) == 1 return l[0] def parse_der(self, der: bytes) -> None: """Parse a sequence of PE and store the result in self.pe_list.""" self.pe_list = [] remainder = der while len(remainder): first_tlv, remainder = bertlv_first_segment(remainder) self.pe_list.append(ProfileElement.from_der(first_tlv)) self._process_pelist() def _process_pelist(self) -> None: self._rebuild_pe_by_type() self._rebuild_pes_by_naa() def _rebuild_pe_by_type(self) -> None: self.pe_by_type = {} # build a dict {pe_type: [pe, pe, pe]} for pe in self.pe_list: if pe.type in self.pe_by_type: self.pe_by_type[pe.type].append(pe) else: self.pe_by_type[pe.type] = [pe] def _rebuild_pes_by_naa(self) -> None: """rebuild the self.pes_by_naa dict {naa: [ [pe, pe, pe], [pe, pe] ]} form, which basically means for every NAA there's a lsit of instances, and each consists of a list of a list of PEs.""" self.pres_by_naa = {} petype_not_naa_related = ['securityDomain', 'rfm', 'application', 'end'] naa = ['mf', 'usim', 'isim', 'csim'] cur_naa = None cur_naa_list = [] for pe in self.pe_list: # skip all PE that are not related to NAA if pe.type in petype_not_naa_related: continue if pe.type in naa: if cur_naa: if not cur_naa in self.pes_by_naa: self.pes_by_naa[cur_naa] = [] self.pes_by_naa[cur_naa].append(cur_naa_list) cur_naa = pe.type cur_naa_list = [] cur_naa_list.append(pe) # append the final one if cur_naa and len(cur_naa_list) > 0: if not cur_naa in self.pes_by_naa: self.pes_by_naa[cur_naa] = [] self.pes_by_naa[cur_naa].append(cur_naa_list) def rebuild_mandatory_services(self): """(Re-)build the eUICC Mandatory services list of the ProfileHeader based on what's in the PE-Sequence.""" # services that we cannot auto-determine and which must hence be manually specified manual_services = ['contactless', 'mbms', 'cat-tp', 'suciCalculatorApi', 'dns-resolution', 'scp11ac', 'scp11c-authorization-mechanism', 's16mode', 'eaka'] svc_set = set() # rebuild mandatory NAAs for naa in self.pes_by_naa.keys(): if naa not in ['usim', 'isim', 'csim']: continue # see if any of the instances is mandatory for inst in self.pes_by_naa[naa]: if 'mandated' in inst[0].header: svc_set.add(naa) # rebuild algorithms of all mandatory akaParameters for aka in self.get_pes_for_type('akaParameter'): if 'mandated' in aka.header: if aka.decoded['algoConfiguration'][0] == 'algoParameter': algo_par = aka.decoded['algoConfiguration'][1] algo_id = algo_par['algorithmID'] if algo_id == 1: svc_set.add('milenage') elif algo_id == 2: if len(algo_par['key']) == 32: svc_set.add('tuak256') else: svc_set.add('tuak128') elif algo_id == 3: svc_set.add('usim-test-algorithm') # rebuild algorithms of all mandatory cdmaParameter for cdma in self.get_pes_for_type('cdmaParameter'): if 'mandated' in cdma.header: svc_set.add('cave') # TODO: gba-{usim,isim} (determine from EF.GBA* ?) # determine if EAP is mandatory for eap in self.get_pes_for_type('eap'): if 'mandated' in eap.header: svc_set.add('eap') # determine if javacard is mandatory for app in self.get_pes_for_type('application'): if 'mandated' in app.header: # javacard / multos distinction is not automatically possible, but multos is hypothetical svc_set.add('javacard') # recompute multiple-{usim,isim,csim} for naa_name in ['usim','isim','csim']: if naa_name in self.pes_by_naa[naa]: if len(self.pes_by_naa[naa]) > 1: svc_set.add('multiple-' + naa_name) # TODO: BER-TLV (scan all files for related type?) # TODO: dfLinked files (scan all files, check for non-empty Fcp.linkPath presence of DFs) # TODO: 5G related bits (derive from EF.UST or file presence?) hdr_pe = self.get_pe_for_type('header') # patch in the 'manual' services from the existing list: for old_svc in hdr_pe.decoded['eUICC-Mandatory-services'].keys(): if old_svc in manual_services: svc_set.add(old_svc) hdr_pe.decoded['eUICC-Mandatory-services'] = {x: None for x in svc_set} def rebuild_mandatory_gfstelist(self): """(Re-)build the eUICC Mandatory GFSTEList of the ProfileHeader based on what's in the PE-Sequence.""" template_set = set() for pe in self.pe_list: if pe.header and 'mandated' in pe.header: if 'templateID' in pe.decoded: template_set.add(pe.decoded['templateID']) hdr_pe = self.get_pe_for_type('header') hdr_pe.decoded['eUICC-Mandatory-GFSTEList'] = list(template_set) @classmethod def from_der(cls, der: bytes) -> 'ProfileElementSequence': """Construct an instance from given raw, DER encoded bytes.""" inst = cls() inst.parse_der(der) return inst def to_der(self) -> bytes: """Build an encoded DER representation of the instance.""" out = b'' for pe in self.pe_list: out += pe.to_der() return out def renumber_identification(self): """Re-generate the 'identification' numbering of all PE headers.""" i = 1 for pe in self.pe_list: hdr = pe.header if not hdr: continue pe.header['identification'] = i i += 1 def get_index_by_type(self, petype: str) -> List[int]: """Return a list with the indicies of all instances of PEs of petype.""" ret = [] i = 0 for pe in self.pe_list: if pe.type == petype: ret.append(i) i += 1 return ret def add_ssd(self, ssd: ProfileElementSSD): """Add a SSD (Supplementary Security Domain) After MNO-SD/ISD-P.""" # find MNO-SD index idx = self.get_index_by_type('securityDomain')[0] # insert _after_ MNO-SD self.pe_list.insert(idx+1, ssd) self._process_pelist() self.renumber_identification() def remove_naas_of_type(self, naa: Naa) -> None: """Remove all instances of NAAs of given type. This can be used, for example, to remove all CSIM NAAs from a profile. Will not just remove the PEs, but also any records in 'eUICC-Mandatory-services' or 'eUICC-Mandatory-GFSTEList'.""" hdr = self.pe_by_type['header'][0] # remove any associated mandatory services for service in naa.mandatory_services: if service in hdr.decoded['eUICC-Mandatory-services']: del hdr.decoded['eUICC-Mandatory-services'][service] # remove any associaed mandatory filesystem templates for template in naa.templates: if template in hdr.decoded['eUICC-Mandatory-GFSTEList']: hdr.decoded['eUICC-Mandatory-GFSTEList'] = [x for x in hdr.decoded['eUICC-Mandatory-GFSTEList'] if not template.prefix_match(x)] # determine the ADF names (AIDs) of all NAA ADFs naa_adf_names = [] if naa.pe_types[0] in self.pe_by_type: for pe in self.pe_by_type[naa.pe_types[0]]: adf_name = naa.adf_name() adf = File(adf_name, pe.decoded[adf_name]) naa_adf_names.append(adf.fileDescriptor['dfName']) # remove PEs of each NAA instance if naa.name in self.pes_by_naa: for inst in self.pes_by_naa[naa.name]: # delete all the PEs of the NAA self.pe_list = [pe for pe in self.pe_list if pe not in inst] self._process_pelist() # remove any RFM PEs for the just-removed ADFs if 'rfm' in self.pe_by_type: to_delete_pes = [] for rfm_pe in self.pe_by_type['rfm']: if 'adfRFMAccess' in rfm_pe.decoded: if rfm_pe.decoded['adfRFMAccess']['adfAID'] in naa_adf_names: to_delete_pes.append(rfm_pe) self.pe_list = [pe for pe in self.pe_list if pe not in to_delete_pes] self._process_pelist() # TODO: remove any records related to the ADFs from EF.DIR def __repr__(self) -> str: return "PESequence(%s: %s)" % (self.iccid, ', '.join([str(x) for x in self.pe_list])) def __iter__(self) -> str: yield from self.pe_list @property def iccid(self) -> Optional[str]: """The ICCID of the profile.""" if not 'header' in self.pe_by_type: return None if len(self.pe_by_type['header']) < 1: return None pe_hdr_dec = self.pe_by_type['header'][0].decoded if not 'iccid' in pe_hdr_dec: return None return b2h(pe_hdr_dec['iccid'])