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gsup_messages: Add UMTS AKA related encoding/decoding support

This commit is contained in:
Harald Welte 2016-04-25 15:36:08 +02:00
parent 85234a32db
commit 7ca035deca
2 changed files with 53 additions and 0 deletions
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7
openbsc/include/openbsc/osmo_gsup_messages.h
View File

@ -51,6 +51,12 @@ enum osmo_gsup_iei {
OSMO_GSUP_RAND_IE = 0x20,
OSMO_GSUP_SRES_IE = 0x21,
OSMO_GSUP_KC_IE = 0x22,
/* 3G support */
OSMO_GSUP_IK_IE = 0x23,
OSMO_GSUP_CK_IE = 0x24,
OSMO_GSUP_AUTN_IE = 0x25,
OSMO_GSUP_AUTS_IE = 0x26,
OSMO_GSUP_RES_IE = 0x27,
};
enum osmo_gsup_message_type {
@ -113,6 +119,7 @@ struct osmo_gsup_message {
size_t msisdn_enc_len;
const uint8_t *hlr_enc;
size_t hlr_enc_len;
const uint8_t *auts;
};
int osmo_gsup_decode(const uint8_t *data, size_t data_len,

46
openbsc/src/gprs/osmo_gsup_messages.c
View File

@ -90,6 +90,7 @@ static int decode_auth_info(uint8_t *data, size_t data_len,
uint8_t *value;
size_t value_len;
enum osmo_gsup_iei iei;
uint8_t presence = 0;
/* specific parts */
while (data_len > 0) {
@ -105,6 +106,7 @@ static int decode_auth_info(uint8_t *data, size_t data_len,
goto parse_error;
memcpy(auth_vector->rand, value, value_len);
presence |= (1 << 0);
break;
case OSMO_GSUP_SRES_IE:
@ -112,6 +114,7 @@ static int decode_auth_info(uint8_t *data, size_t data_len,
goto parse_error;
memcpy(auth_vector->sres, value, value_len);
presence |= (1 << 1);
break;
case OSMO_GSUP_KC_IE:
@ -119,6 +122,35 @@ static int decode_auth_info(uint8_t *data, size_t data_len,
goto parse_error;
memcpy(auth_vector->kc, value, value_len);
presence |= (1 << 2);
break;
case OSMO_GSUP_IK_IE:
if (value_len != sizeof(auth_vector->ik))
goto parse_error;
memcpy(auth_vector->ik, value, value_len);
presence |= (1 << 4);
break;
case OSMO_GSUP_CK_IE:
if (value_len != sizeof(auth_vector->ck))
goto parse_error;
memcpy(auth_vector->ck, value, value_len);
presence |= (1 << 5);
break;
case OSMO_GSUP_AUTN_IE:
if (value_len != sizeof(auth_vector->autn))
goto parse_error;
memcpy(auth_vector->autn, value, value_len);
presence |= (1 << 6);
break;
case OSMO_GSUP_RES_IE:
if (value_len > sizeof(auth_vector->res))
goto parse_error;
memcpy(auth_vector->res, value, value_len);
auth_vector->res_len = value_len;
presence |= (1 << 7);
break;
default:
@ -128,6 +160,11 @@ static int decode_auth_info(uint8_t *data, size_t data_len,
}
}
if (presence & 0x07)
auth_vector->auth_types |= OSMO_AUTH_TYPE_GSM;
if (presence & 0xf0)
auth_vector->auth_types |= OSMO_AUTH_TYPE_UMTS;
return 0;
parse_error:
@ -270,6 +307,15 @@ int osmo_gsup_decode(const uint8_t *const_data, size_t data_len,
auth_info;
break;
case OSMO_GSUP_AUTS_IE:
if (value_len != 16) {
LOGP(DGPRS, LOGL_ERROR,
"AUTS length != 16 received\n");
return -GMM_CAUSE_COND_IE_ERR;
}
gsup_msg->auts = value;
break;
case OSMO_GSUP_MSISDN_IE:
gsup_msg->msisdn_enc = value;
gsup_msg->msisdn_enc_len = value_len;