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AlekSIS®
Onboarding
AlekSIS-App-Kort
Merge requests
!14
Draft: Resolve "Object / Person identification using SDM NFC cards"
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Draft: Resolve "Object / Person identification using SDM NFC cards"
15-object-person-identification-using-sdm-nfc-cards
into
main
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30
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Nik | Klampfradler
requested to merge
15-object-person-identification-using-sdm-nfc-cards
into
main
1 year ago
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#15
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Verified
f00e832d
Fix bugs in SDM implementation
· f00e832d
Jonathan Weth
authored
1 year ago
aleksis/apps/kort/models/sdm.py
+
12
−
7
Options
from
binascii
import
unhexlify
from
django.core.exceptions
import
BadRequest
from
django.
core.
http
import
Request
from
django.http
import
Http
Request
from
libsdm
import
EncMode
,
InvalidMessage
,
decrypt_sun_message
from
libsdm.derive
import
derive_
undiversified_key
,
derive_tag
_key
from
libsdm.derive
import
derive_
tag_key
,
derive_undiversified
_key
from
libsdm.util
import
parse_parameters
from
aleksis.core.mixins
import
ExtensibleModel
,
ObjectAuthenticator
@@ -15,13 +15,18 @@ from .cards import Card
class
NfcSdmAuthenticator
(
ObjectAuthenticator
):
"""
Object authenticator using NFC SDM.
"""
name
=
"
nfc_sdm
"
require_lrp
=
False
def
authenticate
(
self
,
request
:
Request
,
obj
:
ExtensibleModel
):
def
authenticate
(
self
,
request
:
Http
Request
,
obj
:
ExtensibleModel
):
"""
SUN decrypting authenticator
"""
master_key
=
unhexlify
(
get_site_preferences
()[
"
nfc__sdm_master_key
"
])
param_mode
,
picc_enc_data
,
enc_file_data
,
sdmmac
=
parse_parameters
(
request
.
GET
)
master_key
=
unhexlify
(
get_site_preferences
()[
"
kort__sdm_master_key
"
])
try
:
param_mode
,
picc_enc_data
,
enc_file_data
,
sdmmac
=
parse_parameters
(
request
.
GET
)
except
ValueError
as
e
:
raise
BadRequest
(
**
e
.
args
)
try
:
res
=
decrypt_sun_message
(
param_mode
=
param_mode
,
@@ -40,13 +45,13 @@ class NfcSdmAuthenticator(ObjectAuthenticator):
try
:
card
=
Card
.
objects
.
get
(
chip_number__iexact
=
res
[
"
uid
"
].
hex
())
except
Card
.
DoesNotEx
ac
t
:
except
Card
.
DoesNotEx
is
t
:
return
False
if
card
.
person
!=
obj
:
raise
BadRequest
(
"
Card is not linked to identified object
"
)
if
card
.
last_read_counter
<
=
res
[
"
read_ctr
"
]:
if
card
.
last_read_counter
>
=
res
[
"
read_ctr
"
]:
raise
BadRequest
(
"
Read counter went backwards, possible replay attack
"
)
card
.
last_read_counter
=
res
[
"
read_ctr
"
]
card
.
save
()
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