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generate random challenge during CHAP auth

This commit is contained in:
Andre Puschmann 2018-05-04 14:31:18 +02:00
parent 47c09fc034
commit 6add9ed4b4
1 changed files with 9 additions and 6 deletions
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15
srsue/src/upper/nas.cc
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@ -84,6 +84,10 @@ void nas::init(usim_interface_nas *usim_,
have_guti = true;
have_ctxt = true;
}
// set seed for rand (used in CHAP auth)
srand(time(NULL));
running = true;
}
@ -1240,18 +1244,16 @@ void nas::send_esm_information_response(const uint8 proc_transaction_id) {
16 /* data value */ +
cfg.user.length();
uint8_t challenge[len];
uint8_t challenge[len] = {};
challenge[0] = 0x01; // challenge code
challenge[1] = chap_id; // ID
challenge[2] = (len >> 8) & 0xff;
challenge[3] = len & 0xff;
challenge[4] = 16;
uint8_t chal_val[16] = { 0xed, 0x0b, 0x26, 0x26, 0xed, 0x0b, 0x26, 0x26,
0xed, 0x0b, 0x26, 0x26, 0xed, 0x0b, 0x26, 0x26 };
// Append random challenge value
for (int i = 0; i < 16; i++) {
challenge[5 + i] = chal_val[i];
challenge[5 + i] = rand() & 0xFF;
}
// add user as name field
@ -1261,7 +1263,7 @@ void nas::send_esm_information_response(const uint8 proc_transaction_id) {
}
// Generate response
uint8_t response[len];
uint8_t response[len] = {};
response[0] = 0x02; // response code
response[1] = chap_id;
response[2] = (len >> 8) & 0xff;
@ -1282,6 +1284,7 @@ void nas::send_esm_information_response(const uint8 proc_transaction_id) {
}
// copy original challenge behind secret
uint8_t *chal_val = &challenge[5];
memcpy(&resp_val[1+cfg.pass.length()], chal_val, 16);
// Compute MD5 of resp_val and add to response