Harald Welte | e72cf55 | 2016-04-28 07:18:49 +0200 | [diff] [blame] | 1 | /* (C) 2015 by Harald Welte <laforge@gnumonks.org> |
| 2 | * |
| 3 | * All Rights Reserved |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU Affero General Public License as published by |
| 7 | * the Free Software Foundation; either version 3 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU Affero General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU Affero General Public License |
| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | * |
| 18 | */ |
| 19 | |
| 20 | #include <string.h> |
| 21 | |
| 22 | #include <osmocom/core/utils.h> |
| 23 | #include <osmocom/crypt/auth.h> |
| 24 | |
| 25 | #include "logging.h" |
| 26 | #include "rand.h" |
| 27 | |
| 28 | /* compute given number of vectors using either aud2g or aud2g or a combination |
| 29 | * of both. Handles re-synchrnization if rand_auts and auts are set */ |
| 30 | int auc_compute_vectors(struct osmo_auth_vector *vec, unsigned int num_vec, |
| 31 | struct osmo_sub_auth_data *aud2g, |
| 32 | struct osmo_sub_auth_data *aud3g, |
| 33 | const uint8_t *rand_auts, const uint8_t *auts) |
| 34 | { |
| 35 | unsigned int i; |
| 36 | uint8_t rand[16]; |
| 37 | int rc; |
| 38 | |
| 39 | if (aud2g->algo == OSMO_AUTH_ALG_NONE) |
| 40 | aud2g = NULL; |
| 41 | if (aud3g->algo == OSMO_AUTH_ALG_NONE) |
| 42 | aud3g = NULL; |
| 43 | |
| 44 | if (!aud2g && !aud3g) |
| 45 | return -1; |
| 46 | |
| 47 | /* compute quintuples */ |
| 48 | for (i = 0; i < num_vec; i++) { |
| 49 | rc = rand_get(rand, sizeof(rand)); |
| 50 | if (rc != sizeof(rand)) { |
| 51 | LOGP(DAUC, LOGL_ERROR, "Unable to read %zu random " |
| 52 | "bytes: rc=%d\n", sizeof(rand), rc); |
| 53 | goto out; |
| 54 | } |
| 55 | |
| 56 | if (aud2g && !aud3g) { |
| 57 | /* 2G only case: output directly to vec */ |
| 58 | rc = osmo_auth_gen_vec(vec+i, aud2g, rand); |
| 59 | if (rc < 0) { |
| 60 | LOGP(DAUC, LOGL_ERROR, "Error in 2G vector " |
| 61 | "generation: %d\n", rc); |
| 62 | goto out; |
| 63 | } |
| 64 | } else if (aud3g) { |
| 65 | /* 3G or 3G + 2G case */ |
| 66 | if (rand_auts && auts) |
| 67 | rc = osmo_auth_gen_vec_auts(vec+i, aud3g, |
| 68 | rand_auts, |
| 69 | auts, rand); |
| 70 | else |
| 71 | rc = osmo_auth_gen_vec(vec+i, aud3g, rand); |
| 72 | if (rc < 0) { |
| 73 | LOGP(DAUC, LOGL_ERROR, "Error in 3G vector " |
| 74 | "generation: %d\n", rc); |
| 75 | goto out; |
| 76 | } |
| 77 | } |
| 78 | if (aud2g && aud3g) { |
| 79 | /* separate 2G + 3G case: patch 2G into 3G */ |
| 80 | struct osmo_auth_vector vtmp; |
| 81 | rc = osmo_auth_gen_vec(&vtmp, aud2g, rand); |
| 82 | if (rc < 0) { |
| 83 | LOGP(DAUC, LOGL_ERROR, "Error in 2G vector " |
| 84 | "generation: %d\n", rc); |
| 85 | goto out; |
| 86 | } |
| 87 | memcpy(&vec[i].kc, vtmp.kc, sizeof(vec[i].kc)); |
| 88 | memcpy(&vec[i].sres, vtmp.sres, sizeof(vec[i].sres)); |
| 89 | vec[i].auth_types |= OSMO_AUTH_TYPE_GSM; |
| 90 | } |
| 91 | } |
| 92 | out: |
| 93 | return i; |
| 94 | } |