laforge has submitted this change. ( https://gerrit.osmocom.org/c/pysim/+/37619?usp=email )

Change subject: pySim.esim.saip: Decode each 'File' element in ProfileElement ......................................................................

pySim.esim.saip: Decode each 'File' element in ProfileElement

When loading a ProfileElement from its DER-ecoded format, populate a dict with a pySim.esim.saip.File object for each file.

Change-Id: Ie2791c10289eb28daed2904467b0c5e5b11c94c2 --- M pySim/esim/saip/__init__.py 1 file changed, 59 insertions(+), 16 deletions(-)

Approvals: fixeria: Looks good to me, but someone else must approve laforge: Looks good to me, approved Jenkins Builder: Verified

diff --git a/pySim/esim/saip/__init__.py b/pySim/esim/saip/__init__.py index abaa679..c76cb5c 100644 --- a/pySim/esim/saip/__init__.py +++ b/pySim/esim/saip/__init__.py @@ -147,9 +147,10 @@ if k == 'fileDescriptor': return v fd = get_fileDescriptor(l) - if not fd: - raise ValueError("No fileDescriptor found") - self.fileDescriptor.update(dict(fd)) + 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 to_tuples(self) -> List[Tuple]: @@ -262,13 +263,6 @@ """Return the decoded templateID used by this profile element (if any).""" return self.decoded.get('templateID', None)

- @property - def files(self): - """Return dict of decoded 'File' ASN.1 items.""" - if not self.type in self.FILE_BEARING: - return {} - return {k:v for (k,v) in self.decoded.items() if k not in ['templateID', self.header_name]} - @classmethod def from_der(cls, der: bytes) -> 'ProfileElement': class4petype = { @@ -311,7 +305,44 @@ def __str__(self) -> str: return self.type

-class ProfileElementMF(ProfileElement): +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 ProfileElementMF(FsProfileElement): type = 'mf'

def __init__(self, decoded: Optional[dict] = None): @@ -390,7 +421,7 @@ self.decoded['pinCodes'][1].append(pin)

-class ProfileElementTelecom(ProfileElement): +class ProfileElementTelecom(FsProfileElement): type = 'telecom'

def __init__(self, decoded: Optional[dict] = None): @@ -576,7 +607,7 @@ 'adfAdminAccessDomain': ADM1_ACCESS, }

-class ProfileElementUSIM(ProfileElement): +class ProfileElementUSIM(FsProfileElement): type = 'usim'

def __init__(self, decoded: Optional[dict] = None): @@ -597,7 +628,7 @@ f = File('ef-imsi', self.decoded['ef-imsi']) return dec_imsi(b2h(f.stream.getvalue()))

-class ProfileElementOptUSIM(ProfileElement): +class ProfileElementOptUSIM(FsProfileElement): type = 'opt-usim'

def __init__(self, decoded: Optional[dict] = None): @@ -607,7 +638,7 @@ # provide some reasonable defaults for a MNO-SD self.decoded['templateID'] = str(oid.ADF_USIMopt_not_by_default_v2)

-class ProfileElementISIM(ProfileElement): +class ProfileElementISIM(FsProfileElement): type = 'isim'

def __init__(self, decoded: Optional[dict] = None): @@ -623,7 +654,7 @@ def adf_name(self) -> str: return b2h(self.decoded['adf-isim'][0][1]['dfName'])

-class ProfileElementOptISIM(ProfileElement): +class ProfileElementOptISIM(FsProfileElement): type = 'opt-isim'

def __init__(self, decoded: Optional[dict] = None):