Jacob Erlbeck | 3b5d407 | 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 | |
Harald Welte | 53373bc | 2016-04-20 17:11:43 +0200 | [diff] [blame] | 22 | #include <osmocom/gsm/protocol/gsm_04_08_gprs.h> |
Neels Hofmeyr | 93bafb6 | 2017-01-13 03:12:08 +0100 | [diff] [blame] | 23 | #include <osmocom/core/utils.h> |
Neels Hofmeyr | 396f2e6 | 2017-09-04 15:13:25 +0200 | [diff] [blame] | 24 | #include <osmocom/sgsn/sgsn.h> |
| 25 | #include <osmocom/sgsn/gprs_sgsn.h> |
| 26 | #include <osmocom/sgsn/gprs_gmm.h> |
| 27 | #include <osmocom/sgsn/gprs_subscriber.h> |
| 28 | #include <osmocom/sgsn/debug.h> |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 29 | |
| 30 | const struct value_string auth_state_names[] = { |
| 31 | { SGSN_AUTH_ACCEPTED, "accepted"}, |
| 32 | { SGSN_AUTH_REJECTED, "rejected"}, |
| 33 | { SGSN_AUTH_UNKNOWN, "unknown"}, |
Harald Welte | 7c55ede | 2016-05-05 18:31:37 +0200 | [diff] [blame] | 34 | { SGSN_AUTH_AUTHENTICATE, "authenticate" }, |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 35 | { SGSN_AUTH_UMTS_RESYNC, "UMTS-resync" }, |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 36 | { 0, NULL } |
| 37 | }; |
Jacob Erlbeck | 3b5d407 | 2014-10-24 15:11:03 +0200 | [diff] [blame] | 38 | |
Jacob Erlbeck | f951a01 | 2014-11-07 14:17:44 +0100 | [diff] [blame] | 39 | const struct value_string *sgsn_auth_state_names = auth_state_names; |
| 40 | |
Jacob Erlbeck | a0b6efb | 2014-11-13 10:48:39 +0100 | [diff] [blame] | 41 | void sgsn_auth_init(void) |
Jacob Erlbeck | 3b5d407 | 2014-10-24 15:11:03 +0200 | [diff] [blame] | 42 | { |
Jacob Erlbeck | a0b6efb | 2014-11-13 10:48:39 +0100 | [diff] [blame] | 43 | INIT_LLIST_HEAD(&sgsn->cfg.imsi_acl); |
Jacob Erlbeck | 3b5d407 | 2014-10-24 15:11:03 +0200 | [diff] [blame] | 44 | } |
| 45 | |
| 46 | /* temporary IMSI ACL hack */ |
| 47 | struct imsi_acl_entry *sgsn_acl_lookup(const char *imsi, struct sgsn_config *cfg) |
| 48 | { |
| 49 | struct imsi_acl_entry *acl; |
| 50 | llist_for_each_entry(acl, &cfg->imsi_acl, list) { |
| 51 | if (!strcmp(imsi, acl->imsi)) |
| 52 | return acl; |
| 53 | } |
| 54 | return NULL; |
| 55 | } |
| 56 | |
| 57 | int sgsn_acl_add(const char *imsi, struct sgsn_config *cfg) |
| 58 | { |
| 59 | struct imsi_acl_entry *acl; |
| 60 | |
| 61 | if (sgsn_acl_lookup(imsi, cfg)) |
| 62 | return -EEXIST; |
| 63 | |
| 64 | acl = talloc_zero(NULL, struct imsi_acl_entry); |
| 65 | if (!acl) |
| 66 | return -ENOMEM; |
Neels Hofmeyr | 93bafb6 | 2017-01-13 03:12:08 +0100 | [diff] [blame] | 67 | osmo_strlcpy(acl->imsi, imsi, sizeof(acl->imsi)); |
Jacob Erlbeck | 3b5d407 | 2014-10-24 15:11:03 +0200 | [diff] [blame] | 68 | |
| 69 | llist_add(&acl->list, &cfg->imsi_acl); |
| 70 | |
| 71 | return 0; |
| 72 | } |
| 73 | |
| 74 | int sgsn_acl_del(const char *imsi, struct sgsn_config *cfg) |
| 75 | { |
| 76 | struct imsi_acl_entry *acl; |
| 77 | |
| 78 | acl = sgsn_acl_lookup(imsi, cfg); |
| 79 | if (!acl) |
| 80 | return -ENODEV; |
| 81 | |
| 82 | llist_del(&acl->list); |
| 83 | talloc_free(acl); |
| 84 | |
| 85 | return 0; |
| 86 | } |
| 87 | |
Jacob Erlbeck | a0b6efb | 2014-11-13 10:48:39 +0100 | [diff] [blame] | 88 | enum sgsn_auth_state sgsn_auth_state(struct sgsn_mm_ctx *mmctx) |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 89 | { |
| 90 | char mccmnc[16]; |
Jacob Erlbeck | 106f547 | 2014-11-04 10:08:37 +0100 | [diff] [blame] | 91 | int check_net = 0; |
| 92 | int check_acl = 0; |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 93 | |
| 94 | OSMO_ASSERT(mmctx); |
| 95 | |
Jacob Erlbeck | 106f547 | 2014-11-04 10:08:37 +0100 | [diff] [blame] | 96 | switch (sgsn->cfg.auth_policy) { |
| 97 | case SGSN_AUTH_POLICY_OPEN: |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 98 | return SGSN_AUTH_ACCEPTED; |
| 99 | |
Jacob Erlbeck | 106f547 | 2014-11-04 10:08:37 +0100 | [diff] [blame] | 100 | case SGSN_AUTH_POLICY_CLOSED: |
| 101 | check_net = 1; |
| 102 | check_acl = 1; |
| 103 | break; |
| 104 | |
| 105 | case SGSN_AUTH_POLICY_ACL_ONLY: |
| 106 | check_acl = 1; |
| 107 | break; |
Jacob Erlbeck | be2c8d9 | 2014-11-12 10:18:09 +0100 | [diff] [blame] | 108 | |
| 109 | case SGSN_AUTH_POLICY_REMOTE: |
| 110 | if (!mmctx->subscr) |
| 111 | return mmctx->auth_state; |
| 112 | |
Jacob Erlbeck | 98a95ac | 2014-11-28 14:55:25 +0100 | [diff] [blame] | 113 | if (mmctx->subscr->flags & GPRS_SUBSCRIBER_UPDATE_PENDING_MASK) |
Jacob Erlbeck | be2c8d9 | 2014-11-12 10:18:09 +0100 | [diff] [blame] | 114 | return mmctx->auth_state; |
| 115 | |
Jacob Erlbeck | 9d4f46c | 2014-12-17 13:20:08 +0100 | [diff] [blame] | 116 | if (sgsn->cfg.require_authentication && |
Neels Hofmeyr | aa4ed67 | 2018-04-22 19:29:41 +0200 | [diff] [blame] | 117 | (!sgsn_mm_ctx_is_authenticated(mmctx) || |
Jacob Erlbeck | 98a95ac | 2014-11-28 14:55:25 +0100 | [diff] [blame] | 118 | mmctx->subscr->sgsn_data->auth_triplets_updated)) |
Jacob Erlbeck | 2e5e94c | 2014-12-08 15:26:47 +0100 | [diff] [blame] | 119 | return SGSN_AUTH_AUTHENTICATE; |
| 120 | |
Jacob Erlbeck | be2c8d9 | 2014-11-12 10:18:09 +0100 | [diff] [blame] | 121 | if (mmctx->subscr->authorized) |
| 122 | return SGSN_AUTH_ACCEPTED; |
| 123 | |
| 124 | return SGSN_AUTH_REJECTED; |
Jacob Erlbeck | 106f547 | 2014-11-04 10:08:37 +0100 | [diff] [blame] | 125 | } |
| 126 | |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 127 | if (!strlen(mmctx->imsi)) { |
| 128 | LOGMMCTXP(LOGL_NOTICE, mmctx, |
| 129 | "Missing IMSI, authorization state not known\n"); |
| 130 | return SGSN_AUTH_UNKNOWN; |
| 131 | } |
| 132 | |
Jacob Erlbeck | 106f547 | 2014-11-04 10:08:37 +0100 | [diff] [blame] | 133 | if (check_net) { |
| 134 | /* We simply assume that the IMSI exists, as long as it is part |
| 135 | * of 'our' network */ |
Neels Hofmeyr | 10719b7 | 2018-02-21 00:39:36 +0100 | [diff] [blame] | 136 | snprintf(mccmnc, sizeof(mccmnc), "%s%s", |
| 137 | osmo_mcc_name(mmctx->ra.mcc), |
| 138 | osmo_mnc_name(mmctx->ra.mnc, mmctx->ra.mnc_3_digits)); |
| 139 | if (strncmp(mccmnc, mmctx->imsi, mmctx->ra.mnc_3_digits ? 6 : 5) == 0) |
Jacob Erlbeck | 106f547 | 2014-11-04 10:08:37 +0100 | [diff] [blame] | 140 | return SGSN_AUTH_ACCEPTED; |
| 141 | } |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 142 | |
Jacob Erlbeck | 106f547 | 2014-11-04 10:08:37 +0100 | [diff] [blame] | 143 | if (check_acl && sgsn_acl_lookup(mmctx->imsi, &sgsn->cfg)) |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 144 | return SGSN_AUTH_ACCEPTED; |
| 145 | |
| 146 | return SGSN_AUTH_REJECTED; |
| 147 | } |
| 148 | |
Jacob Erlbeck | 98a95ac | 2014-11-28 14:55:25 +0100 | [diff] [blame] | 149 | /* |
| 150 | * This function is directly called by e.g. the GMM layer. It returns either |
| 151 | * after calling sgsn_auth_update directly or after triggering an asynchronous |
| 152 | * procedure which will call sgsn_auth_update later on. |
| 153 | */ |
Jacob Erlbeck | a0b6efb | 2014-11-13 10:48:39 +0100 | [diff] [blame] | 154 | int sgsn_auth_request(struct sgsn_mm_ctx *mmctx) |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 155 | { |
Neels Hofmeyr | 0e5d807 | 2017-01-10 00:49:56 +0100 | [diff] [blame] | 156 | struct gprs_subscr *subscr; |
Jacob Erlbeck | 98a95ac | 2014-11-28 14:55:25 +0100 | [diff] [blame] | 157 | struct gsm_auth_tuple *at; |
| 158 | int need_update_location; |
| 159 | int rc; |
| 160 | |
Jacob Erlbeck | be2c8d9 | 2014-11-12 10:18:09 +0100 | [diff] [blame] | 161 | LOGMMCTXP(LOGL_DEBUG, mmctx, "Requesting authorization\n"); |
| 162 | |
Jacob Erlbeck | 98a95ac | 2014-11-28 14:55:25 +0100 | [diff] [blame] | 163 | if (sgsn->cfg.auth_policy != SGSN_AUTH_POLICY_REMOTE) { |
| 164 | sgsn_auth_update(mmctx); |
| 165 | return 0; |
| 166 | } |
| 167 | |
Jacob Erlbeck | 771573c | 2014-12-19 18:08:48 +0100 | [diff] [blame] | 168 | need_update_location = sgsn->cfg.require_update_location && |
| 169 | (mmctx->subscr == NULL || |
| 170 | mmctx->pending_req == GSM48_MT_GMM_ATTACH_REQ); |
Jacob Erlbeck | 98a95ac | 2014-11-28 14:55:25 +0100 | [diff] [blame] | 171 | |
| 172 | /* This has the side effect of registering the subscr with the mmctx */ |
| 173 | subscr = gprs_subscr_get_or_create_by_mmctx(mmctx); |
Neels Hofmeyr | 0e5d807 | 2017-01-10 00:49:56 +0100 | [diff] [blame] | 174 | gprs_subscr_put(subscr); |
Jacob Erlbeck | 98a95ac | 2014-11-28 14:55:25 +0100 | [diff] [blame] | 175 | |
| 176 | OSMO_ASSERT(mmctx->subscr != NULL); |
| 177 | |
Neels Hofmeyr | aa4ed67 | 2018-04-22 19:29:41 +0200 | [diff] [blame] | 178 | if (sgsn->cfg.require_authentication && !sgsn_mm_ctx_is_authenticated(mmctx)) { |
Jacob Erlbeck | 98a95ac | 2014-11-28 14:55:25 +0100 | [diff] [blame] | 179 | /* Find next tuple */ |
| 180 | at = sgsn_auth_get_tuple(mmctx, mmctx->auth_triplet.key_seq); |
| 181 | |
| 182 | if (!at) { |
| 183 | /* No valid tuple found, request fresh ones */ |
| 184 | mmctx->auth_triplet.key_seq = GSM_KEY_SEQ_INVAL; |
Jacob Erlbeck | be2c8d9 | 2014-11-12 10:18:09 +0100 | [diff] [blame] | 185 | LOGMMCTXP(LOGL_INFO, mmctx, |
Jacob Erlbeck | 98a95ac | 2014-11-28 14:55:25 +0100 | [diff] [blame] | 186 | "Requesting authentication tuples\n"); |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 187 | rc = gprs_subscr_request_auth_info(mmctx, NULL, NULL); |
Jacob Erlbeck | 98a95ac | 2014-11-28 14:55:25 +0100 | [diff] [blame] | 188 | if (rc >= 0) |
| 189 | return 0; |
| 190 | |
| 191 | return rc; |
Jacob Erlbeck | be2c8d9 | 2014-11-12 10:18:09 +0100 | [diff] [blame] | 192 | } |
Jacob Erlbeck | 98a95ac | 2014-11-28 14:55:25 +0100 | [diff] [blame] | 193 | |
| 194 | mmctx->auth_triplet = *at; |
| 195 | } else if (need_update_location) { |
| 196 | LOGMMCTXP(LOGL_INFO, mmctx, |
| 197 | "Missing information, requesting subscriber data\n"); |
Jacob Erlbeck | 771573c | 2014-12-19 18:08:48 +0100 | [diff] [blame] | 198 | rc = gprs_subscr_request_update_location(mmctx); |
| 199 | if (rc >= 0) |
Jacob Erlbeck | 98a95ac | 2014-11-28 14:55:25 +0100 | [diff] [blame] | 200 | return 0; |
Jacob Erlbeck | 771573c | 2014-12-19 18:08:48 +0100 | [diff] [blame] | 201 | |
| 202 | return rc; |
Jacob Erlbeck | be2c8d9 | 2014-11-12 10:18:09 +0100 | [diff] [blame] | 203 | } |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 204 | |
Jacob Erlbeck | a0b6efb | 2014-11-13 10:48:39 +0100 | [diff] [blame] | 205 | sgsn_auth_update(mmctx); |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 206 | return 0; |
| 207 | } |
| 208 | |
Jacob Erlbeck | a0b6efb | 2014-11-13 10:48:39 +0100 | [diff] [blame] | 209 | void sgsn_auth_update(struct sgsn_mm_ctx *mmctx) |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 210 | { |
Jacob Erlbeck | f951a01 | 2014-11-07 14:17:44 +0100 | [diff] [blame] | 211 | enum sgsn_auth_state auth_state; |
Neels Hofmeyr | 0e5d807 | 2017-01-10 00:49:56 +0100 | [diff] [blame] | 212 | struct gprs_subscr *subscr = mmctx->subscr; |
Jacob Erlbeck | 98a95ac | 2014-11-28 14:55:25 +0100 | [diff] [blame] | 213 | struct gsm_auth_tuple *at; |
Jacob Erlbeck | af3d5c5 | 2015-01-05 17:51:17 +0100 | [diff] [blame] | 214 | int gmm_cause; |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 215 | |
Jacob Erlbeck | a0b6efb | 2014-11-13 10:48:39 +0100 | [diff] [blame] | 216 | auth_state = sgsn_auth_state(mmctx); |
Jacob Erlbeck | 3ea2260 | 2014-12-19 18:17:10 +0100 | [diff] [blame] | 217 | |
| 218 | LOGMMCTXP(LOGL_DEBUG, mmctx, "Updating authorization (%s -> %s)\n", |
| 219 | get_value_string(sgsn_auth_state_names, mmctx->auth_state), |
| 220 | get_value_string(sgsn_auth_state_names, auth_state)); |
| 221 | |
Jacob Erlbeck | be2c8d9 | 2014-11-12 10:18:09 +0100 | [diff] [blame] | 222 | if (auth_state == SGSN_AUTH_UNKNOWN && subscr && |
Jacob Erlbeck | 98a95ac | 2014-11-28 14:55:25 +0100 | [diff] [blame] | 223 | !(subscr->flags & GPRS_SUBSCRIBER_UPDATE_PENDING_MASK)) { |
| 224 | /* Reject requests if gprs_subscr_request_update_location fails */ |
Jacob Erlbeck | f951a01 | 2014-11-07 14:17:44 +0100 | [diff] [blame] | 225 | LOGMMCTXP(LOGL_ERROR, mmctx, |
| 226 | "Missing information, authorization not possible\n"); |
| 227 | auth_state = SGSN_AUTH_REJECTED; |
| 228 | } |
| 229 | |
Jacob Erlbeck | 98a95ac | 2014-11-28 14:55:25 +0100 | [diff] [blame] | 230 | if (auth_state == SGSN_AUTH_AUTHENTICATE && |
| 231 | mmctx->auth_triplet.key_seq == GSM_KEY_SEQ_INVAL) { |
| 232 | /* The current tuple is not valid, but we are possibly called |
| 233 | * because new auth tuples have been received */ |
| 234 | at = sgsn_auth_get_tuple(mmctx, mmctx->auth_triplet.key_seq); |
| 235 | if (!at) { |
| 236 | LOGMMCTXP(LOGL_ERROR, mmctx, |
| 237 | "Missing auth tuples, authorization not possible\n"); |
| 238 | auth_state = SGSN_AUTH_REJECTED; |
| 239 | } else { |
| 240 | mmctx->auth_triplet = *at; |
| 241 | } |
| 242 | } |
| 243 | |
Jacob Erlbeck | f951a01 | 2014-11-07 14:17:44 +0100 | [diff] [blame] | 244 | if (mmctx->auth_state == auth_state) |
| 245 | return; |
| 246 | |
| 247 | LOGMMCTXP(LOGL_INFO, mmctx, "Got authorization update: state %s -> %s\n", |
| 248 | get_value_string(sgsn_auth_state_names, mmctx->auth_state), |
| 249 | get_value_string(sgsn_auth_state_names, auth_state)); |
| 250 | |
| 251 | mmctx->auth_state = auth_state; |
| 252 | |
| 253 | switch (auth_state) { |
Jacob Erlbeck | 2e5e94c | 2014-12-08 15:26:47 +0100 | [diff] [blame] | 254 | case SGSN_AUTH_AUTHENTICATE: |
Jacob Erlbeck | 98a95ac | 2014-11-28 14:55:25 +0100 | [diff] [blame] | 255 | if (subscr) |
| 256 | subscr->sgsn_data->auth_triplets_updated = 0; |
| 257 | |
Jacob Erlbeck | 2e5e94c | 2014-12-08 15:26:47 +0100 | [diff] [blame] | 258 | gsm0408_gprs_authenticate(mmctx); |
| 259 | break; |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 260 | case SGSN_AUTH_ACCEPTED: |
| 261 | gsm0408_gprs_access_granted(mmctx); |
| 262 | break; |
| 263 | case SGSN_AUTH_REJECTED: |
Jacob Erlbeck | d6267d1 | 2015-01-19 11:10:04 +0100 | [diff] [blame] | 264 | gmm_cause = |
| 265 | subscr ? subscr->sgsn_data->error_cause : |
| 266 | SGSN_ERROR_CAUSE_NONE; |
Jacob Erlbeck | af3d5c5 | 2015-01-05 17:51:17 +0100 | [diff] [blame] | 267 | |
Jacob Erlbeck | 98647ca | 2014-11-11 14:47:38 +0100 | [diff] [blame] | 268 | if (subscr && (subscr->flags & GPRS_SUBSCRIBER_CANCELLED) != 0) |
Jacob Erlbeck | af3d5c5 | 2015-01-05 17:51:17 +0100 | [diff] [blame] | 269 | gsm0408_gprs_access_cancelled(mmctx, gmm_cause); |
Jacob Erlbeck | 98647ca | 2014-11-11 14:47:38 +0100 | [diff] [blame] | 270 | else |
Jacob Erlbeck | af3d5c5 | 2015-01-05 17:51:17 +0100 | [diff] [blame] | 271 | gsm0408_gprs_access_denied(mmctx, gmm_cause); |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 272 | break; |
| 273 | default: |
| 274 | break; |
| 275 | } |
| 276 | } |
Jacob Erlbeck | 7921ab1 | 2014-12-08 15:52:00 +0100 | [diff] [blame] | 277 | |
| 278 | struct gsm_auth_tuple *sgsn_auth_get_tuple(struct sgsn_mm_ctx *mmctx, |
| 279 | unsigned key_seq) |
| 280 | { |
| 281 | unsigned count; |
| 282 | unsigned idx; |
| 283 | struct gsm_auth_tuple *at = NULL; |
| 284 | |
| 285 | struct sgsn_subscriber_data *sdata; |
| 286 | |
| 287 | if (!mmctx->subscr) |
| 288 | return NULL; |
| 289 | |
| 290 | if (key_seq == GSM_KEY_SEQ_INVAL) |
| 291 | /* Start with 0 after increment module array size */ |
| 292 | idx = ARRAY_SIZE(sdata->auth_triplets) - 1; |
| 293 | else |
| 294 | idx = key_seq; |
| 295 | |
| 296 | sdata = mmctx->subscr->sgsn_data; |
| 297 | |
| 298 | /* Find next tuple */ |
| 299 | for (count = ARRAY_SIZE(sdata->auth_triplets); count > 0; count--) { |
| 300 | idx = (idx + 1) % ARRAY_SIZE(sdata->auth_triplets); |
| 301 | |
| 302 | if (sdata->auth_triplets[idx].key_seq == GSM_KEY_SEQ_INVAL) |
| 303 | continue; |
| 304 | |
| 305 | if (sdata->auth_triplets[idx].use_count == 0) { |
| 306 | at = &sdata->auth_triplets[idx]; |
| 307 | at->use_count = 1; |
| 308 | return at; |
| 309 | } |
| 310 | } |
| 311 | |
| 312 | return NULL; |
| 313 | } |