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Michael Black
OpenXG-RAN
Commits
9072101a
Commit
9072101a
authored
Apr 15, 2020
by
Robert Schmidt
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Correctly decode IMSI also when not integrity protected
parent
c5fdcd85
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1
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12 additions
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14 deletions
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-14
openair2/RRC/LTE/rrc_eNB_S1AP.c
openair2/RRC/LTE/rrc_eNB_S1AP.c
+12
-14
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openair2/RRC/LTE/rrc_eNB_S1AP.c
View file @
9072101a
...
...
@@ -96,36 +96,34 @@ void extract_imsi(uint8_t *pdu_buf, uint32_t pdu_len, rrc_eNB_ue_context_t *ue_c
&&
pdu_len
>
NAS_MESSAGE_SECURITY_HEADER_SIZE
))
return
;
/* Decode plain NAS message */
EMM_msg
*
e_msg
=
&
nas_msg
.
plain
.
emm
;
emm_msg_header_t
*
emm_header
=
&
e_msg
->
header
;
if
(
header
->
security_header_type
!=
SECURITY_HEADER_TYPE_NOT_PROTECTED
)
{
/* Decode the message authentication code */
DECODE_U32
((
char
*
)
pdu_buf
+
size
,
header
->
message_authentication_code
,
size
);
/* Decode the sequence number */
DECODE_U8
((
char
*
)
pdu_buf
+
size
,
header
->
sequence_number
,
size
);
}
/* Decode the security header type and the protocol discriminator */
DECODE_U8
(
pdu_buf
+
size
,
*
(
uint8_t
*
)(
emm_header
),
size
);
/* Note: the value of the pointer (i.e. the address) is given by value, so we
* can modify it as we want. The callee retains the original address! */
/* Check that this is the right message */
if
(
emm_header
->
protocol_discriminator
!=
EPS_MOBILITY_MANAGEMENT_MESSAGE
)
return
;
}
pdu_buf
+=
size
;
pdu_len
-=
size
;
/* Decode plain NAS message */
EMM_msg
*
e_msg
=
&
nas_msg
.
plain
.
emm
;
emm_msg_header_t
*
emm_header
=
&
e_msg
->
header
;
/* First decode the EMM message header */
int
e_head_size
=
0
;
/* Check that buffer contains more than only the header */
if
(
pdu_len
<=
sizeof
(
emm_msg_header_t
))
return
;
/*
Decode the security header type and the protocol discriminato
r */
DECODE_U8
(
pdu_buf
+
e_head_size
,
*
(
uint8_t
*
)(
emm_header
),
e_head_size
)
;
/*
First decode the EMM message heade
r */
int
e_head_size
=
0
;
/* Decode the message type */
DECODE_U8
(
pdu_buf
+
e_head_size
,
emm_header
->
message_type
,
e_head_size
);
/* Check that this is the right message */
if
(
emm_header
->
protocol_discriminator
!=
EPS_MOBILITY_MANAGEMENT_MESSAGE
)
return
;
pdu_buf
+=
e_head_size
;
pdu_len
-=
e_head_size
;
...
...
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