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nas: use MME security header when receiving identity request 

this basically avoids sending a integrity protected or ciphered
identity response to a plain identity request
This commit is contained in:
Andre Puschmann 2020-04-03 21:25:16 +02:00
parent 057844d7d6
commit a4abd96ab6
1 changed files with 1 additions and 0 deletions
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srsue/src/stack/upper/nas.cc
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@ -1359,6 +1359,7 @@ void nas::parse_identity_request(unique_byte_buffer_t pdu, const uint8_t sec_hdr
// do not respond if request is not protected (TS 24.301 Sec. 4.4.4.2)
if (sec_hdr_type >= LIBLTE_MME_SECURITY_HDR_TYPE_INTEGRITY ||
(sec_hdr_type == LIBLTE_MME_SECURITY_HDR_TYPE_PLAIN_NAS && id_req.id_type == LIBLTE_MME_MOBILE_ID_TYPE_IMSI)) {
current_sec_hdr = sec_hdr_type; // use MME protection level until security (re-)activation
send_identity_response(id_req.id_type);
} else {
nas_log->info("Not sending identity response due to missing integrity protection.\n");