def parse_logging_config(log_config_spec) -> Dict[Optional[str], LogConfig]:
if not isinstance(log_config_spec, dict):
raise ConfigurationError('logging config should be a dictionary')
root_logger_level = _retrieve_log_level(
log_config_spec, 'root-level', default=DEFAULT_ROOT_LOGGER_LEVEL
)
root_logger_output = get_and_apply(
log_config_spec, 'root-output', LogConfig.parse_output_spec,
default=StdLogOutput.STDERR
)
log_config = {None: LogConfig(root_logger_level, root_logger_output)}
logging_by_module = log_config_spec.get('by-module', {})
if not isinstance(logging_by_module, dict):
raise ConfigurationError('logging.by-module should be a dict')
for module, module_logging_settings in logging_by_module.items():
if not isinstance(module, str):
raise ConfigurationError(
"Keys in logging.by-module should be strings"
)
level_spec = _retrieve_log_level(module_logging_settings, 'level')
output_spec = get_and_apply(
module_logging_settings, 'output', LogConfig.parse_output_spec,
default=StdLogOutput.STDERR
)
log_config[module] = LogConfig(level=level_spec, output=output_spec)
return log_config
def read_dss(cls, handler: PdfHandler) -> 'DocumentSecurityStore':
"""
Read a DSS record from a file and add the data to a validation context.
:param handler:
PDF handler from which to read the DSS.
:return:
A DocumentSecurityStore object describing the current state of the
DSS.
"""
try:
dss_dict = handler.root['/DSS']
except KeyError as e:
raise NoDSSFoundError() from e
cert_refs = {}
cert_ref_list = get_and_apply(dss_dict, '/Certs', list, default=())
for cert_ref in cert_ref_list:
cert_stream: generic.StreamObject = cert_ref.get_object()
cert: Certificate = Certificate.load(cert_stream.data)
cert_refs[cert.issuer_serial] = cert_ref
ocsp_refs = get_and_apply(dss_dict, '/OCSPs', list, default=())
ocsps = []
for ocsp_ref in ocsp_refs:
ocsp_stream: generic.StreamObject = ocsp_ref.get_object()
resp = asn1_ocsp.OCSPResponse.load(ocsp_stream.data)
ocsps.append(resp)
crl_refs = get_and_apply(dss_dict, '/CRLs', list, default=())
crls = []
for crl_ref in crl_refs:
crl_stream: generic.StreamObject = crl_ref.get_object()
crl = asn1_crl.CertificateList.load(crl_stream.data)
crls.append(crl)
# shallow-copy the VRI dictionary
try:
vri_entries = dict(dss_dict['/VRI'])
except KeyError:
vri_entries = None
# if the handler is a writer, the DSS will support updates
if isinstance(handler, BasePdfFileWriter):
writer = handler
else:
writer = None
# the DSS returned will be backed by the original DSS object, so CRLs
# are automagically preserved if they happened to be included in
# the original file
dss = cls(
writer=writer, certs=cert_refs, ocsps=ocsp_refs,
vri_entries=vri_entries, crls=crl_refs, backing_pdf_object=dss_dict
)
return dss
def from_pdf_object(cls, pdf_dict):
"""
Read a PDF dictionary into a :class:`.SigCertConstraints` object.
:param pdf_dict:
A :class:`~.generic.DictionaryObject`.
:return:
A :class:`.SigCertConstraints` object.
"""
if isinstance(pdf_dict, generic.IndirectObject):
pdf_dict = pdf_dict.get_object()
try:
if pdf_dict['/Type'] != '/SVCert': # pragma: nocover
raise ValueError('Object /Type entry is not /SVCert')
except KeyError: # pragma: nocover
pass
flags = SigCertConstraintFlags(pdf_dict.get('/Ff', 0))
subjects = [
oskeys.parse_certificate(cert.original_bytes)
for cert in pdf_dict.get('/Subject', ())
]
issuers = [
oskeys.parse_certificate(cert.original_bytes)
for cert in pdf_dict.get('/Issuer', ())
]
def format_attr(attr):
# strip initial /
attr = attr[1:]
# attempt to convert abbreviated attrs to OIDs, since build()
# takes OIDs
return name_type_abbrevs_rev.get(attr.upper(), attr)
subject_dns = x509.Name.build({
format_attr(attr): value
for dn_dir in pdf_dict.get('/SubjectDN', ())
for attr, value in dn_dir.items()
})
def parse_key_usage(val):
return [SigCertKeyUsage.read_from_sv_string(ku) for ku in val]
key_usage = get_and_apply(pdf_dict, '/KeyUsage', parse_key_usage)
url = pdf_dict.get('/URL')
url_type = pdf_dict.get('/URLType')
kwargs = {
'flags': flags,
'subjects': subjects or None,
'subject_dn': subject_dns or None,
'issuers': issuers or None,
'info_url': url,
'key_usage': key_usage
}
if url is not None and url_type is not None:
kwargs['url_type'] = url_type
return cls(**kwargs)
def from_pdf_object(cls, pdf_dict):
"""
Read from a seed value dictionary.
:param pdf_dict:
A :class:`~.generic.DictionaryObject`.
:return:
A :class:`.SigSeedValueSpec` object.
"""
if isinstance(pdf_dict, generic.IndirectObject):
pdf_dict = pdf_dict.get_object()
try:
if pdf_dict['/Type'] != '/SV': # pragma: nocover
raise ValueError('Object /Type entry is not /SV')
except KeyError: # pragma: nocover
pass
flags = SigSeedValFlags(pdf_dict.get('/Ff', 0))
try:
sig_filter = pdf_dict['/Filter']
if (flags & SigSeedValFlags.FILTER) and \
(sig_filter != '/Adobe.PPKLite'):
raise SigningError(
"Signature handler '%s' is not available, only the "
"default /Adobe.PPKLite is supported." % sig_filter)
except KeyError:
pass
try:
min_version = pdf_dict['/V']
supported = SeedValueDictVersion.PDF_2_0.value
if flags & SigSeedValFlags.V and min_version > supported:
raise SigningError(
"Seed value dictionary version %s not supported." %
min_version)
min_version = SeedValueDictVersion(min_version)
except KeyError:
min_version = None
try:
add_rev_info = bool(pdf_dict['/AddRevInfo'])
except KeyError:
add_rev_info = None
subfilter_reqs = pdf_dict.get('/SubFilter', None)
subfilters = None
if subfilter_reqs is not None:
def _subfilters():
for s in subfilter_reqs:
try:
yield SigSeedSubFilter(s)
except ValueError:
pass
subfilters = list(_subfilters())
try:
digest_methods = [s.lower() for s in pdf_dict['/DigestMethod']]
except KeyError:
digest_methods = None
reasons = get_and_apply(pdf_dict, '/Reasons', list)
legal_attestations = get_and_apply(pdf_dict, '/LegalAttestation', list)
def read_mdp_dict(mdp):
try:
val = mdp['/P']
return SeedSignatureType(None if val == 0 else MDPPerm(val))
except (KeyError, TypeError, ValueError):
raise SigningError(
f"/MDP entry {mdp} in seed value dictionary is not "
"correctly formatted.")
signature_type = get_and_apply(pdf_dict, '/MDP', read_mdp_dict)
def read_lock_document(val):
try:
return SeedLockDocument(val)
except ValueError:
raise SigningError(f"/LockDocument entry '{val}' is invalid.")
lock_document = get_and_apply(pdf_dict, '/LockDocument',
read_lock_document)
appearance_filter = pdf_dict.get('/AppearanceFilter', None)
timestamp_dict = pdf_dict.get('/TimeStamp', {})
timestamp_server_url = timestamp_dict.get('/URL', None)
timestamp_required = bool(timestamp_dict.get('/Ff', 0))
cert_constraints = pdf_dict.get('/Cert', None)
if cert_constraints is not None:
cert_constraints = SigCertConstraints.from_pdf_object(
cert_constraints)
return cls(flags=flags,
reasons=reasons,
timestamp_server_url=timestamp_server_url,
cert=cert_constraints,
subfilters=subfilters,
digest_methods=digest_methods,
add_rev_info=add_rev_info,
timestamp_required=timestamp_required,
legal_attestations=legal_attestations,
seed_signature_type=signature_type,
sv_dict_version=min_version,
lock_document=lock_document,
appearance=appearance_filter)
def from_pdf_object(cls, pdf_dict):
"""
Read from a seed value dictionary.
:param pdf_dict:
A :class:`~.generic.DictionaryObject`.
:return:
A :class:`.SigSeedValueSpec` object.
"""
if isinstance(pdf_dict, generic.IndirectObject):
pdf_dict = pdf_dict.get_object()
try:
if pdf_dict['/Type'] != '/SV': # pragma: nocover
raise ValueError('Object /Type entry is not /SV')
except KeyError: # pragma: nocover
pass
flags = SigSeedValFlags(pdf_dict.get('/Ff', 0))
try:
sig_filter = pdf_dict['/Filter']
if (flags & SigSeedValFlags.FILTER) and \
(sig_filter != '/Adobe.PPKLite'):
raise SigningError(
"Signature handler '%s' is not available, only the "
"default /Adobe.PPKLite is supported." % sig_filter)
except KeyError:
pass
# TODO support all PDF 2.0 values
min_version = pdf_dict.get('/V', 1)
if flags & SigSeedValFlags.V and min_version > 1:
raise SigningError(
"Seed value dictionary version %s not supported." %
min_version)
try:
add_rev_info = bool(pdf_dict['/AddRevInfo'])
except KeyError:
add_rev_info = None
subfilter_reqs = pdf_dict.get('/SubFilter', None)
subfilters = None
if subfilter_reqs is not None:
def _subfilters():
for s in subfilter_reqs:
try:
yield SigSeedSubFilter(s)
except ValueError:
pass
subfilters = list(_subfilters())
try:
digest_methods = [s.lower() for s in pdf_dict['/DigestMethod']]
except KeyError:
digest_methods = None
reasons = get_and_apply(pdf_dict, '/Reasons', list)
timestamp_dict = pdf_dict.get('/TimeStamp', {})
timestamp_server_url = timestamp_dict.get('/URL', None)
timestamp_required = bool(timestamp_dict.get('/Ff', 0))
cert_constraints = pdf_dict.get('/Cert', None)
if cert_constraints is not None:
cert_constraints = SigCertConstraints.from_pdf_object(
cert_constraints)
return cls(flags=flags,
reasons=reasons,
timestamp_server_url=timestamp_server_url,
cert=cert_constraints,
subfilters=subfilters,
digest_methods=digest_methods,
add_rev_info=add_rev_info,
timestamp_required=timestamp_required)
