| /* (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; |
| } |