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/* (C) 2015 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <string.h>
#include <osmocom/core/utils.h>
#include <osmocom/crypt/auth.h>
#include "logging.h"
#include "rand.h"
/* compute given number of vectors using either aud2g or aud2g or a combination
* of both. Handles re-synchronization if rand_auts and auts are set */
int auc_compute_vectors(struct osmo_auth_vector *vec, unsigned int num_vec,
struct osmo_sub_auth_data *aud2g,
struct osmo_sub_auth_data *aud3g,
const uint8_t *rand_auts, const uint8_t *auts)
{
unsigned int i;
uint8_t rand[16];
int rc;
if (aud2g && (aud2g->algo == OSMO_AUTH_ALG_NONE
|| aud2g->type == OSMO_AUTH_TYPE_NONE))
aud2g = NULL;
if (aud3g && (aud3g->algo == OSMO_AUTH_ALG_NONE
|| aud3g->type == OSMO_AUTH_TYPE_NONE))
aud3g = NULL;
if (!aud2g && !aud3g) {
LOGP(DAUC, LOGL_ERROR, "auc_compute_vectors() called"
" with neither 2G nor 3G auth data available\n");
return -1;
}
if (aud2g && aud2g->type != OSMO_AUTH_TYPE_GSM) {
LOGP(DAUC, LOGL_ERROR, "auc_compute_vectors() called"
" with non-2G auth data passed for aud2g arg\n");
return -1;
}
if (aud3g && aud3g->type != OSMO_AUTH_TYPE_UMTS) {
LOGP(DAUC, LOGL_ERROR, "auc_compute_vectors() called"
" with non-3G auth data passed for aud3g arg\n");
return -1;
}
if ((rand_auts != NULL) != (auts != NULL)) {
LOGP(DAUC, LOGL_ERROR, "auc_compute_vectors() with only one"
" of AUTS and AUTS_RAND given, need both or neither\n");
return -1;
}
if (auts && !aud3g) {
LOGP(DAUC, LOGL_ERROR, "auc_compute_vectors() with AUTS called"
" but no 3G auth data passed\n");
return -1;
}
/* compute quintuples */
for (i = 0; i < num_vec; i++) {
rc = rand_get(rand, sizeof(rand));
DEBUGP(DAUC, "rand %s\n", osmo_hexdump_nospc(rand, sizeof(rand)));
if (rc != sizeof(rand)) {
LOGP(DAUC, LOGL_ERROR, "Unable to read %zu random "
"bytes: rc=%d\n", sizeof(rand), rc);
goto out;
}
if (aud2g && !aud3g) {
/* 2G only case: output directly to vec */
DEBUGP(DAUC, "compute vector [%u]/%u: 2G only\n",
i, num_vec);
rc = osmo_auth_gen_vec(vec+i, aud2g, rand);
if (rc < 0) {
LOGP(DAUC, LOGL_ERROR, "Error in 2G vector "
"generation: %d\n", rc);
goto out;
}
} else if (aud3g) {
/* 3G or 3G + 2G case */
if (!aud2g)
DEBUGP(DAUC, "compute vector [%u]/%u: 3G only\n",
i, num_vec);
if (rand_auts && auts)
rc = osmo_auth_gen_vec_auts(vec+i, aud3g,
auts, rand_auts,
rand);
else
rc = osmo_auth_gen_vec(vec+i, aud3g, rand);
if (rc < 0) {
LOGP(DAUC, LOGL_ERROR, "Error in 3G vector "
"generation: %d\n", rc);
goto out;
}
}
if (aud2g && aud3g) {
/* separate 2G + 3G case: patch 2G into 3G */
struct osmo_auth_vector vtmp;
DEBUGP(DAUC, "compute vector [%u]/%u:"
" separate 2G + 3G\n", i, num_vec);
rc = osmo_auth_gen_vec(&vtmp, aud2g, rand);
if (rc < 0) {
LOGP(DAUC, LOGL_ERROR, "Error in 2G vector "
"generation: %d\n", rc);
goto out;
}
memcpy(&vec[i].kc, vtmp.kc, sizeof(vec[i].kc));
memcpy(&vec[i].sres, vtmp.sres, sizeof(vec[i].sres));
vec[i].auth_types |= OSMO_AUTH_TYPE_GSM;
}
}
out:
return i;
}
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