Jacob Erlbeck | 4760eae | 2014-10-24 15:11:03 +0200 | [diff] [blame] | 1 | /* MS authorization and subscriber data handling */ |
| 2 | |
| 3 | /* (C) 2009-2010 by Harald Welte <laforge@gnumonks.org> |
| 4 | * |
| 5 | * All Rights Reserved |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU Affero General Public License as published by |
| 9 | * the Free Software Foundation; either version 3 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU Affero General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Affero General Public License |
| 18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | #include <openbsc/sgsn.h> |
| 23 | #include <openbsc/gprs_sgsn.h> |
Jacob Erlbeck | c64af7a | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 24 | #include <openbsc/gprs_gmm.h> |
Jacob Erlbeck | d04f7cc | 2014-11-12 10:18:09 +0100 | [diff] [blame] | 25 | #include <openbsc/gsm_subscriber.h> |
Jacob Erlbeck | c64af7a | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 26 | |
| 27 | #include <openbsc/debug.h> |
| 28 | |
| 29 | const struct value_string auth_state_names[] = { |
| 30 | { SGSN_AUTH_ACCEPTED, "accepted"}, |
| 31 | { SGSN_AUTH_REJECTED, "rejected"}, |
| 32 | { SGSN_AUTH_UNKNOWN, "unknown"}, |
| 33 | { 0, NULL } |
| 34 | }; |
Jacob Erlbeck | 4760eae | 2014-10-24 15:11:03 +0200 | [diff] [blame] | 35 | |
Jacob Erlbeck | 802d78a | 2014-11-07 14:17:44 +0100 | [diff] [blame] | 36 | const struct value_string *sgsn_auth_state_names = auth_state_names; |
| 37 | |
Jacob Erlbeck | b2acd74 | 2014-11-13 10:48:39 +0100 | [diff] [blame] | 38 | void sgsn_auth_init(void) |
Jacob Erlbeck | 4760eae | 2014-10-24 15:11:03 +0200 | [diff] [blame] | 39 | { |
Jacob Erlbeck | b2acd74 | 2014-11-13 10:48:39 +0100 | [diff] [blame] | 40 | INIT_LLIST_HEAD(&sgsn->cfg.imsi_acl); |
Jacob Erlbeck | 4760eae | 2014-10-24 15:11:03 +0200 | [diff] [blame] | 41 | } |
| 42 | |
| 43 | /* temporary IMSI ACL hack */ |
| 44 | struct imsi_acl_entry *sgsn_acl_lookup(const char *imsi, struct sgsn_config *cfg) |
| 45 | { |
| 46 | struct imsi_acl_entry *acl; |
| 47 | llist_for_each_entry(acl, &cfg->imsi_acl, list) { |
| 48 | if (!strcmp(imsi, acl->imsi)) |
| 49 | return acl; |
| 50 | } |
| 51 | return NULL; |
| 52 | } |
| 53 | |
| 54 | int sgsn_acl_add(const char *imsi, struct sgsn_config *cfg) |
| 55 | { |
| 56 | struct imsi_acl_entry *acl; |
| 57 | |
| 58 | if (sgsn_acl_lookup(imsi, cfg)) |
| 59 | return -EEXIST; |
| 60 | |
| 61 | acl = talloc_zero(NULL, struct imsi_acl_entry); |
| 62 | if (!acl) |
| 63 | return -ENOMEM; |
| 64 | strncpy(acl->imsi, imsi, sizeof(acl->imsi)); |
| 65 | |
| 66 | llist_add(&acl->list, &cfg->imsi_acl); |
| 67 | |
| 68 | return 0; |
| 69 | } |
| 70 | |
| 71 | int sgsn_acl_del(const char *imsi, struct sgsn_config *cfg) |
| 72 | { |
| 73 | struct imsi_acl_entry *acl; |
| 74 | |
| 75 | acl = sgsn_acl_lookup(imsi, cfg); |
| 76 | if (!acl) |
| 77 | return -ENODEV; |
| 78 | |
| 79 | llist_del(&acl->list); |
| 80 | talloc_free(acl); |
| 81 | |
| 82 | return 0; |
| 83 | } |
| 84 | |
Jacob Erlbeck | b2acd74 | 2014-11-13 10:48:39 +0100 | [diff] [blame] | 85 | enum sgsn_auth_state sgsn_auth_state(struct sgsn_mm_ctx *mmctx) |
Jacob Erlbeck | c64af7a | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 86 | { |
| 87 | char mccmnc[16]; |
Jacob Erlbeck | d7b7773 | 2014-11-04 10:08:37 +0100 | [diff] [blame] | 88 | int check_net = 0; |
| 89 | int check_acl = 0; |
Jacob Erlbeck | c64af7a | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 90 | |
| 91 | OSMO_ASSERT(mmctx); |
| 92 | |
Jacob Erlbeck | d7b7773 | 2014-11-04 10:08:37 +0100 | [diff] [blame] | 93 | switch (sgsn->cfg.auth_policy) { |
| 94 | case SGSN_AUTH_POLICY_OPEN: |
Jacob Erlbeck | c64af7a | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 95 | return SGSN_AUTH_ACCEPTED; |
| 96 | |
Jacob Erlbeck | d7b7773 | 2014-11-04 10:08:37 +0100 | [diff] [blame] | 97 | case SGSN_AUTH_POLICY_CLOSED: |
| 98 | check_net = 1; |
| 99 | check_acl = 1; |
| 100 | break; |
| 101 | |
| 102 | case SGSN_AUTH_POLICY_ACL_ONLY: |
| 103 | check_acl = 1; |
| 104 | break; |
Jacob Erlbeck | d04f7cc | 2014-11-12 10:18:09 +0100 | [diff] [blame] | 105 | |
| 106 | case SGSN_AUTH_POLICY_REMOTE: |
| 107 | if (!mmctx->subscr) |
| 108 | return mmctx->auth_state; |
| 109 | |
| 110 | if (mmctx->subscr->flags & GPRS_SUBSCRIBER_UPDATE_PENDING) |
| 111 | return mmctx->auth_state; |
| 112 | |
| 113 | if (mmctx->subscr->authorized) |
| 114 | return SGSN_AUTH_ACCEPTED; |
| 115 | |
| 116 | return SGSN_AUTH_REJECTED; |
Jacob Erlbeck | d7b7773 | 2014-11-04 10:08:37 +0100 | [diff] [blame] | 117 | } |
| 118 | |
Jacob Erlbeck | c64af7a | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 119 | if (!strlen(mmctx->imsi)) { |
| 120 | LOGMMCTXP(LOGL_NOTICE, mmctx, |
| 121 | "Missing IMSI, authorization state not known\n"); |
| 122 | return SGSN_AUTH_UNKNOWN; |
| 123 | } |
| 124 | |
Jacob Erlbeck | d7b7773 | 2014-11-04 10:08:37 +0100 | [diff] [blame] | 125 | if (check_net) { |
| 126 | /* We simply assume that the IMSI exists, as long as it is part |
| 127 | * of 'our' network */ |
| 128 | snprintf(mccmnc, sizeof(mccmnc), "%03d%02d", |
| 129 | mmctx->ra.mcc, mmctx->ra.mnc); |
| 130 | if (strncmp(mccmnc, mmctx->imsi, 5) == 0) |
| 131 | return SGSN_AUTH_ACCEPTED; |
| 132 | } |
Jacob Erlbeck | c64af7a | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 133 | |
Jacob Erlbeck | d7b7773 | 2014-11-04 10:08:37 +0100 | [diff] [blame] | 134 | if (check_acl && sgsn_acl_lookup(mmctx->imsi, &sgsn->cfg)) |
Jacob Erlbeck | c64af7a | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 135 | return SGSN_AUTH_ACCEPTED; |
| 136 | |
| 137 | return SGSN_AUTH_REJECTED; |
| 138 | } |
| 139 | |
Jacob Erlbeck | b2acd74 | 2014-11-13 10:48:39 +0100 | [diff] [blame] | 140 | int sgsn_auth_request(struct sgsn_mm_ctx *mmctx) |
Jacob Erlbeck | c64af7a | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 141 | { |
Jacob Erlbeck | d04f7cc | 2014-11-12 10:18:09 +0100 | [diff] [blame] | 142 | LOGMMCTXP(LOGL_DEBUG, mmctx, "Requesting authorization\n"); |
| 143 | |
| 144 | if (sgsn->cfg.auth_policy == SGSN_AUTH_POLICY_REMOTE && !mmctx->subscr) { |
| 145 | if (gprs_subscr_request_update(mmctx) >= 0) { |
| 146 | LOGMMCTXP(LOGL_INFO, mmctx, |
| 147 | "Missing information, requesting subscriber data\n"); |
| 148 | return 0; |
| 149 | } |
| 150 | } |
Jacob Erlbeck | c64af7a | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 151 | |
Jacob Erlbeck | b2acd74 | 2014-11-13 10:48:39 +0100 | [diff] [blame] | 152 | sgsn_auth_update(mmctx); |
Jacob Erlbeck | c64af7a | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 153 | |
Jacob Erlbeck | c64af7a | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 154 | return 0; |
| 155 | } |
| 156 | |
Jacob Erlbeck | b2acd74 | 2014-11-13 10:48:39 +0100 | [diff] [blame] | 157 | void sgsn_auth_update(struct sgsn_mm_ctx *mmctx) |
Jacob Erlbeck | c64af7a | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 158 | { |
Jacob Erlbeck | 802d78a | 2014-11-07 14:17:44 +0100 | [diff] [blame] | 159 | enum sgsn_auth_state auth_state; |
Jacob Erlbeck | d04f7cc | 2014-11-12 10:18:09 +0100 | [diff] [blame] | 160 | struct gsm_subscriber *subscr = mmctx->subscr; |
Jacob Erlbeck | c64af7a | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 161 | |
Jacob Erlbeck | 802d78a | 2014-11-07 14:17:44 +0100 | [diff] [blame] | 162 | LOGMMCTXP(LOGL_DEBUG, mmctx, "Updating authorization\n"); |
Jacob Erlbeck | c64af7a | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 163 | |
Jacob Erlbeck | b2acd74 | 2014-11-13 10:48:39 +0100 | [diff] [blame] | 164 | auth_state = sgsn_auth_state(mmctx); |
Jacob Erlbeck | d04f7cc | 2014-11-12 10:18:09 +0100 | [diff] [blame] | 165 | if (auth_state == SGSN_AUTH_UNKNOWN && subscr && |
| 166 | !(subscr->flags & GPRS_SUBSCRIBER_UPDATE_PENDING)) { |
| 167 | /* Reject requests if gprs_subscr_request_update fails */ |
Jacob Erlbeck | 802d78a | 2014-11-07 14:17:44 +0100 | [diff] [blame] | 168 | LOGMMCTXP(LOGL_ERROR, mmctx, |
| 169 | "Missing information, authorization not possible\n"); |
| 170 | auth_state = SGSN_AUTH_REJECTED; |
| 171 | } |
| 172 | |
| 173 | if (mmctx->auth_state == auth_state) |
| 174 | return; |
| 175 | |
| 176 | LOGMMCTXP(LOGL_INFO, mmctx, "Got authorization update: state %s -> %s\n", |
| 177 | get_value_string(sgsn_auth_state_names, mmctx->auth_state), |
| 178 | get_value_string(sgsn_auth_state_names, auth_state)); |
| 179 | |
| 180 | mmctx->auth_state = auth_state; |
| 181 | |
| 182 | switch (auth_state) { |
Jacob Erlbeck | c64af7a | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 183 | case SGSN_AUTH_ACCEPTED: |
| 184 | gsm0408_gprs_access_granted(mmctx); |
| 185 | break; |
| 186 | case SGSN_AUTH_REJECTED: |
Jacob Erlbeck | bf0b874 | 2014-11-11 14:47:38 +0100 | [diff] [blame] | 187 | if (subscr && (subscr->flags & GPRS_SUBSCRIBER_CANCELLED) != 0) |
| 188 | gsm0408_gprs_access_cancelled(mmctx); |
| 189 | else |
| 190 | gsm0408_gprs_access_denied(mmctx); |
Jacob Erlbeck | c64af7a | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 191 | break; |
| 192 | default: |
| 193 | break; |
| 194 | } |
| 195 | } |