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IuCS auth: generate auth tuples, factor out

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Factor out hardcoded-Ki and auth tuple creation into a static function.

Add generation of fresh random bytes and generate a valid auth tuple so that
the authentication token is different for every MM Auth.
This commit is contained in:
Neels Hofmeyr
2016-04-12 15:15:35 +02:00
parent 3aa8b30bb3
commit c7fcdeb18e
1 changed files with 32 additions and 11 deletions
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43
openbsc/src/libmsc/gsm_04_08.c
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@@ -28,6 +28,7 @@
#include <errno.h>
#include <time.h>
#include <netinet/in.h>
#include <openssl/rand.h>
#include "bscconfig.h"
@@ -62,6 +63,7 @@
#include <osmocom/core/msgb.h>
#include <osmocom/core/talloc.h>
#include <osmocom/gsm/tlv.h>
#include <osmocom/crypt/auth.h>
#include <openbsc/msc_ifaces.h>
#include <openbsc/iu.h>
@@ -142,6 +144,33 @@ void allocate_security_operation(struct gsm_subscriber_connection *conn)
struct gsm_security_operation);
}
int iu_hack__get_hardcoded_auth_tuple(struct gsm_auth_tuple *atuple)
{
uint8_t tmp_rand[16];
struct osmo_auth_vector vec;
/* Ki 000102030405060708090a0b0c0d0e0f */
struct osmo_sub_auth_data auth = {
.type = OSMO_AUTH_TYPE_GSM,
.algo = OSMO_AUTH_ALG_COMP128v1,
.u.gsm.ki = {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d,
0x0e, 0x0f
},
};
RAND_bytes(&tmp_rand, sizeof(tmp_rand));
memset(&vec, 0, sizeof(vec));
osmo_auth_gen_vec(&vec, &auth, tmp_rand);
atuple->key_seq = 0;
memcpy(&atuple->rand, &tmp_rand, sizeof(tmp_rand));
memcpy(&atuple->sres, &vec.sres, sizeof(vec.sres));
memcpy(&atuple->kc, &vec.kc, sizeof(vec.kc));
return AUTH_DO_AUTH;
}
int gsm48_secure_channel(struct gsm_subscriber_connection *conn, int key_seq,
gsm_cbfn *cb, void *cb_data)
{
@@ -177,18 +206,10 @@ int gsm48_secure_channel(struct gsm_subscriber_connection *conn, int key_seq,
/* If not done yet, try to get info for this user */
if (status < 0) {
/* DEV HACK: hardcode keys for Iu */
if (conn->via_iface == IFACE_IU) {
/* Ki 000102030405060708090a0b0c0d0e0f */
atuple = (struct gsm_auth_tuple ) {
.key_seq = 0,
.rand = { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 },
.sres = { 0x61, 0xb5, 0x69, 0xf5 },
.kc = { 0xd9, 0xd9, 0xc2, 0xed, 0x62, 0x7d, 0x68, 0x00 },
};
rc = AUTH_DO_AUTH;
}
if (conn->via_iface == IFACE_IU)
rc = iu_hack__get_hardcoded_auth_tuple(&atuple);
else
rc = auth_get_tuple_for_subscr(&atuple, subscr, key_seq);
rc = auth_get_tuple_for_subscr(&atuple, subscr, key_seq);
DEBUGP(DMM, "auth_get_tuple_for_subscr(%s) == %d\n",
subscr_name(subscr), rc);
if (rc <= 0) {