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construct: add adapter Utf8Adapter to safely interpret utf8 text

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Uninitialized Files, File records or fields in a File record or File
usually contain a string of 0xff bytes. This becomes a problem when the
content is normally encoded/decoded as utf8 since by the construct
parser. The parser will throw an expection when it tries to decode the
0xff string as utf8. This is especially a serious problem in pySim-trace
where an execption stops the parser.

Let's fix this by interpreting a string of 0xff as an empty string.

Related: OS#6094
Change-Id: Id114096ccb8b7ff8fcc91e1ef3002526afa09cb7
This commit is contained in:
Philipp Maier
2023-07-26 17:01:37 +02:00
parent fec721fcb1
commit 791f80a44f
3 changed files with 25 additions and 10 deletions
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12
pySim/ts_31_103.py
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@@ -30,6 +30,7 @@ from pySim.ts_31_102 import ADF_USIM, EF_FromPreferred
from pySim.ts_31_102_telecom import EF_UServiceTable
import pySim.ts_102_221
from pySim.ts_102_221 import EF_ARR
from pySim.construct import *
# Mapping between ISIM Service Number and its description
EF_IST_map = {
@@ -62,8 +63,9 @@ class EF_IMPI(TransparentEF):
( '803137333830303630303030303031303140696d732e6d6e633030302e6d63633733382e336770706e6574776f726b2e6f7267',
{ "nai": "738006000000101@ims.mnc000.mcc738.3gppnetwork.org" } ),
]
class nai(BER_TLV_IE, tag=0x80):
_construct = GreedyString("utf8")
_construct = Utf8Adapter(GreedyBytes)
def __init__(self, fid='6f02', sfid=0x02, name='EF.IMPI', desc='IMS private user identity', **kwargs):
super().__init__(fid=fid, sfid=sfid, name=name, desc=desc, **kwargs)
@@ -76,7 +78,7 @@ class EF_DOMAIN(TransparentEF):
{ "domain": "ims.mnc000.mcc738.3gppnetwork.org" } ),
]
class domain(BER_TLV_IE, tag=0x80):
_construct = GreedyString("utf8")
_construct = Utf8Adapter(GreedyBytes)
def __init__(self, fid='6f03', sfid=0x05, name='EF.DOMAIN', desc='Home Network Domain Name', **kwargs):
super().__init__(fid=fid, sfid=sfid, name=name, desc=desc, **kwargs)
@@ -89,7 +91,7 @@ class EF_IMPU(LinFixedEF):
{ "impu": "sip:738006000000101@ims.mnc000.mcc738.3gppnetwork.org" } ),
]
class impu(BER_TLV_IE, tag=0x80):
_construct = GreedyString("utf8")
_construct = Utf8Adapter(GreedyBytes)
def __init__(self, fid='6f04', sfid=0x04, name='EF.IMPU', desc='IMS public user identity', **kwargs):
super().__init__(fid=fid, sfid=sfid, name=name, desc=desc, **kwargs)
@@ -165,7 +167,7 @@ class EF_NAFKCA(LinFixedEF):
# TS 31.103 Section 4.2.16
class EF_UICCIARI(LinFixedEF):
class iari(BER_TLV_IE, tag=0x80):
_construct = GreedyString("utf8")
_construct = Utf8Adapter(GreedyBytes)
def __init__(self, fid='6fe7', sfid=None, name='EF.UICCIARI', desc='UICC IARI', **kwargs):
super().__init__(fid=fid, sfid=sfid, name=name, desc=desc, **kwargs)
@@ -232,7 +234,7 @@ class EF_XCAPConfigData(BerTlvEF):
# TS 31.103 Section 4.2.20
class EF_WebRTCURI(TransparentEF):
class uri(BER_TLV_IE, tag=0x80):
_construct = GreedyString("utf8")
_construct = Utf8Adapter(GreedyBytes)
def __init__(self, fid='6ffa', sfid=None, name='EF.WebRTCURI', desc='WebRTC URI', **kwargs):
super().__init__(fid=fid, sfid=sfid, name=name, desc=desc, **kwargs)