mirror of https://gerrit.osmocom.org/libosmocore
571 lines
15 KiB
C
571 lines
15 KiB
C
/*
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* (C) 2014 by sysmocom - s.f.m.c. GmbH
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* Author: Jacob Erlbeck
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* (C) 2015 by Holger Hans Peter Freyther
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* (C) 2016 by Harald Welte <laforge@gnumonks.org>
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* All Rights Reserved
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*
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* SPDX-License-Identifier: GPL-2.0+
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <osmocom/gsm/tlv.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/gsm/gsm48_ie.h>
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#include <osmocom/gsm/gsup.h>
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#include <stdint.h>
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/*! \addtogroup gsup
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* @{
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* \file gsup.c
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* Osmocom Generic Subscriber Update Protocol
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*/
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const struct value_string osmo_gsup_message_type_names[] = {
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OSMO_VALUE_STRING(OSMO_GSUP_MSGT_UPDATE_LOCATION_REQUEST),
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OSMO_VALUE_STRING(OSMO_GSUP_MSGT_UPDATE_LOCATION_ERROR),
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OSMO_VALUE_STRING(OSMO_GSUP_MSGT_UPDATE_LOCATION_RESULT),
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OSMO_VALUE_STRING(OSMO_GSUP_MSGT_SEND_AUTH_INFO_REQUEST),
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OSMO_VALUE_STRING(OSMO_GSUP_MSGT_SEND_AUTH_INFO_ERROR),
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OSMO_VALUE_STRING(OSMO_GSUP_MSGT_SEND_AUTH_INFO_RESULT),
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OSMO_VALUE_STRING(OSMO_GSUP_MSGT_AUTH_FAIL_REPORT),
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OSMO_VALUE_STRING(OSMO_GSUP_MSGT_PURGE_MS_REQUEST),
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OSMO_VALUE_STRING(OSMO_GSUP_MSGT_PURGE_MS_ERROR),
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OSMO_VALUE_STRING(OSMO_GSUP_MSGT_PURGE_MS_RESULT),
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OSMO_VALUE_STRING(OSMO_GSUP_MSGT_INSERT_DATA_REQUEST),
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OSMO_VALUE_STRING(OSMO_GSUP_MSGT_INSERT_DATA_ERROR),
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OSMO_VALUE_STRING(OSMO_GSUP_MSGT_INSERT_DATA_RESULT),
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OSMO_VALUE_STRING(OSMO_GSUP_MSGT_DELETE_DATA_REQUEST),
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OSMO_VALUE_STRING(OSMO_GSUP_MSGT_DELETE_DATA_ERROR),
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OSMO_VALUE_STRING(OSMO_GSUP_MSGT_DELETE_DATA_RESULT),
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OSMO_VALUE_STRING(OSMO_GSUP_MSGT_LOCATION_CANCEL_REQUEST),
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OSMO_VALUE_STRING(OSMO_GSUP_MSGT_LOCATION_CANCEL_ERROR),
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OSMO_VALUE_STRING(OSMO_GSUP_MSGT_LOCATION_CANCEL_RESULT),
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{ 0, NULL }
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};
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static int decode_pdp_info(uint8_t *data, size_t data_len,
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struct osmo_gsup_pdp_info *pdp_info)
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{
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int rc;
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uint8_t tag;
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uint8_t *value;
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size_t value_len;
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/* specific parts */
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while (data_len > 0) {
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enum osmo_gsup_iei iei;
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rc = osmo_shift_tlv(&data, &data_len, &tag, &value, &value_len);
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if (rc < 0)
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return -GMM_CAUSE_PROTO_ERR_UNSPEC;
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iei = tag;
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switch (iei) {
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case OSMO_GSUP_PDP_CONTEXT_ID_IE:
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pdp_info->context_id = osmo_decode_big_endian(value, value_len);
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break;
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case OSMO_GSUP_PDP_TYPE_IE:
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pdp_info->pdp_type =
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osmo_decode_big_endian(value, value_len) & 0x0fff;
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break;
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case OSMO_GSUP_ACCESS_POINT_NAME_IE:
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pdp_info->apn_enc = value;
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pdp_info->apn_enc_len = value_len;
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break;
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case OSMO_GSUP_PDP_QOS_IE:
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pdp_info->qos_enc = value;
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pdp_info->qos_enc_len = value_len;
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break;
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case OSMO_GSUP_CHARG_CHAR_IE:
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pdp_info->pdp_charg_enc = value;
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pdp_info->pdp_charg_enc_len = value_len;
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break;
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default:
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LOGP(DLGSUP, LOGL_ERROR,
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"GSUP IE type %d not expected in PDP info\n", iei);
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continue;
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}
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}
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return 0;
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}
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static int decode_auth_info(uint8_t *data, size_t data_len,
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struct osmo_auth_vector *auth_vector)
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{
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int rc;
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uint8_t tag;
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uint8_t *value;
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size_t value_len;
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enum osmo_gsup_iei iei;
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uint8_t presence = 0;
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/* specific parts */
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while (data_len > 0) {
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rc = osmo_shift_tlv(&data, &data_len, &tag, &value, &value_len);
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if (rc < 0)
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return -GMM_CAUSE_PROTO_ERR_UNSPEC;
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iei = tag;
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switch (iei) {
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case OSMO_GSUP_RAND_IE:
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if (value_len != sizeof(auth_vector->rand))
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goto parse_error;
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memcpy(auth_vector->rand, value, value_len);
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presence |= (1 << 0);
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break;
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case OSMO_GSUP_SRES_IE:
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if (value_len != sizeof(auth_vector->sres))
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goto parse_error;
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memcpy(auth_vector->sres, value, value_len);
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presence |= (1 << 1);
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break;
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case OSMO_GSUP_KC_IE:
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if (value_len != sizeof(auth_vector->kc))
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goto parse_error;
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memcpy(auth_vector->kc, value, value_len);
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presence |= (1 << 2);
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break;
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case OSMO_GSUP_IK_IE:
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if (value_len != sizeof(auth_vector->ik))
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goto parse_error;
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memcpy(auth_vector->ik, value, value_len);
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presence |= (1 << 4);
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break;
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case OSMO_GSUP_CK_IE:
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if (value_len != sizeof(auth_vector->ck))
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goto parse_error;
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memcpy(auth_vector->ck, value, value_len);
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presence |= (1 << 5);
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break;
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case OSMO_GSUP_AUTN_IE:
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if (value_len != sizeof(auth_vector->autn))
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goto parse_error;
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memcpy(auth_vector->autn, value, value_len);
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presence |= (1 << 6);
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break;
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case OSMO_GSUP_RES_IE:
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if (value_len > sizeof(auth_vector->res))
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goto parse_error;
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memcpy(auth_vector->res, value, value_len);
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auth_vector->res_len = value_len;
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presence |= (1 << 7);
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break;
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default:
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LOGP(DLGSUP, LOGL_ERROR,
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"GSUP IE type %d not expected in PDP info\n", iei);
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continue;
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}
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}
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if (presence & 0x07)
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auth_vector->auth_types |= OSMO_AUTH_TYPE_GSM;
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if (presence & 0xf0)
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auth_vector->auth_types |= OSMO_AUTH_TYPE_UMTS;
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return 0;
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parse_error:
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LOGP(DLGSUP, LOGL_ERROR,
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"GSUP IE type %d, length %zu invalid in PDP info\n", iei, value_len);
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return -1;
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}
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/*! Decode (parse) a GSUP message
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* \param[in] const_data input data to be parsed
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* \param[in] data_len length of input (\a const_data)
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* \param[out] gsup_msg callee-allocated output data structure
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* \returns 0 on success; negative otherwise
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*/
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int osmo_gsup_decode(const uint8_t *const_data, size_t data_len,
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struct osmo_gsup_message *gsup_msg)
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{
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int rc;
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uint8_t tag;
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/* the shift/match functions expect non-const pointers, but we'll
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* either copy the data or cast pointers back to const before returning
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* them
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*/
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uint8_t *data = (uint8_t *)const_data;
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uint8_t *value;
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size_t value_len;
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static const struct osmo_gsup_pdp_info empty_pdp_info = {0};
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static const struct osmo_auth_vector empty_auth_info = {{0}};
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static const struct osmo_gsup_message empty_gsup_message = {0};
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*gsup_msg = empty_gsup_message;
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/* generic part */
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rc = osmo_shift_v_fixed(&data, &data_len, 1, &value);
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if (rc < 0)
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return -GMM_CAUSE_INV_MAND_INFO;
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gsup_msg->message_type = osmo_decode_big_endian(value, 1);
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rc = osmo_match_shift_tlv(&data, &data_len, OSMO_GSUP_IMSI_IE,
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&value, &value_len);
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if (rc <= 0)
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return -GMM_CAUSE_INV_MAND_INFO;
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if (value_len * 2 + 1 > sizeof(gsup_msg->imsi))
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return -GMM_CAUSE_INV_MAND_INFO;
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/* Note that gsm48_decode_bcd_number expects the number of encoded IMSI
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* octets in the first octet. By coincidence (the TLV encoding) the byte
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* before the value part already contains this length so we can use it
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* here.
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*/
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OSMO_ASSERT(value[-1] == value_len);
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gsm48_decode_bcd_number(gsup_msg->imsi, sizeof(gsup_msg->imsi),
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value - 1, 0);
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/* specific parts */
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while (data_len > 0) {
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enum osmo_gsup_iei iei;
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struct osmo_gsup_pdp_info pdp_info;
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struct osmo_auth_vector auth_info;
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rc = osmo_shift_tlv(&data, &data_len, &tag, &value, &value_len);
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if (rc < 0)
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return -GMM_CAUSE_PROTO_ERR_UNSPEC;
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iei = tag;
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switch (iei) {
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case OSMO_GSUP_IMSI_IE:
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case OSMO_GSUP_PDP_TYPE_IE:
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case OSMO_GSUP_ACCESS_POINT_NAME_IE:
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case OSMO_GSUP_SRES_IE:
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case OSMO_GSUP_KC_IE:
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LOGP(DLGSUP, LOGL_NOTICE,
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"GSUP IE type %d not expected (ignored)\n", iei);
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continue;
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case OSMO_GSUP_CAUSE_IE:
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gsup_msg->cause = osmo_decode_big_endian(value, value_len);
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break;
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case OSMO_GSUP_CANCEL_TYPE_IE:
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gsup_msg->cancel_type =
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osmo_decode_big_endian(value, value_len) + 1;
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break;
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case OSMO_GSUP_PDP_INFO_COMPL_IE:
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gsup_msg->pdp_info_compl = 1;
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break;
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case OSMO_GSUP_FREEZE_PTMSI_IE:
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gsup_msg->freeze_ptmsi = 1;
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break;
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case OSMO_GSUP_PDP_CONTEXT_ID_IE:
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/* When these IE appear in the top-level part of the
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* message, they are used by Delete Subscr Info to delete
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* single entries. We don't have an extra list for
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* these but use the PDP info list instead */
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/* fall through */
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case OSMO_GSUP_PDP_INFO_IE:
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if (gsup_msg->num_pdp_infos >= OSMO_GSUP_MAX_NUM_PDP_INFO) {
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LOGP(DLGSUP, LOGL_ERROR,
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"GSUP IE type %d (PDP_INFO) max exceeded\n",
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iei);
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return -GMM_CAUSE_COND_IE_ERR;
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}
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pdp_info = empty_pdp_info;
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if (iei == OSMO_GSUP_PDP_INFO_IE) {
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rc = decode_pdp_info(value, value_len, &pdp_info);
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if (rc < 0)
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return rc;
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pdp_info.have_info = 1;
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} else {
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pdp_info.context_id =
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osmo_decode_big_endian(value, value_len);
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}
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gsup_msg->pdp_infos[gsup_msg->num_pdp_infos++] =
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pdp_info;
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break;
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case OSMO_GSUP_AUTH_TUPLE_IE:
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if (gsup_msg->num_auth_vectors >= OSMO_GSUP_MAX_NUM_AUTH_INFO) {
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LOGP(DLGSUP, LOGL_ERROR,
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"GSUP IE type %d (AUTH_INFO) max exceeded\n",
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iei);
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return -GMM_CAUSE_INV_MAND_INFO;
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}
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auth_info = empty_auth_info;
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rc = decode_auth_info(value, value_len, &auth_info);
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if (rc < 0)
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return rc;
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gsup_msg->auth_vectors[gsup_msg->num_auth_vectors++] =
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auth_info;
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break;
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case OSMO_GSUP_AUTS_IE:
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if (value_len != 14) {
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LOGP(DLGSUP, LOGL_ERROR,
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"AUTS length != 14 received\n");
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return -GMM_CAUSE_COND_IE_ERR;
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}
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gsup_msg->auts = value;
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break;
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case OSMO_GSUP_RAND_IE:
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if (value_len != 16) {
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LOGP(DLGSUP, LOGL_ERROR,
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"RAND length != 16 received\n");
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return -GMM_CAUSE_COND_IE_ERR;
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}
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gsup_msg->rand = value;
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break;
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case OSMO_GSUP_MSISDN_IE:
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gsup_msg->msisdn_enc = value;
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gsup_msg->msisdn_enc_len = value_len;
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break;
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case OSMO_GSUP_HLR_NUMBER_IE:
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gsup_msg->hlr_enc = value;
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gsup_msg->hlr_enc_len = value_len;
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break;
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case OSMO_GSUP_CN_DOMAIN_IE:
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gsup_msg->cn_domain = *value;
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break;
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case OSMO_GSUP_CHARG_CHAR_IE:
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gsup_msg->pdp_charg_enc = value;
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gsup_msg->pdp_charg_enc_len = value_len;
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break;
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default:
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LOGP(DLGSUP, LOGL_NOTICE,
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"GSUP IE type %d unknown\n", iei);
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continue;
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}
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}
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return 0;
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}
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static void encode_pdp_info(struct msgb *msg, enum osmo_gsup_iei iei,
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const struct osmo_gsup_pdp_info *pdp_info)
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{
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uint8_t *len_field;
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size_t old_len;
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uint8_t u8;
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len_field = msgb_tlv_put(msg, iei, 0, NULL) - 1;
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old_len = msgb_length(msg);
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u8 = pdp_info->context_id;
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msgb_tlv_put(msg, OSMO_GSUP_PDP_CONTEXT_ID_IE, sizeof(u8), &u8);
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if (pdp_info->pdp_type) {
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msgb_tlv_put(msg, OSMO_GSUP_PDP_TYPE_IE,
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OSMO_GSUP_PDP_TYPE_SIZE,
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osmo_encode_big_endian(pdp_info->pdp_type | 0xf000,
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OSMO_GSUP_PDP_TYPE_SIZE));
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}
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if (pdp_info->apn_enc) {
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msgb_tlv_put(msg, OSMO_GSUP_ACCESS_POINT_NAME_IE,
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pdp_info->apn_enc_len, pdp_info->apn_enc);
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}
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if (pdp_info->qos_enc) {
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msgb_tlv_put(msg, OSMO_GSUP_PDP_QOS_IE,
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pdp_info->qos_enc_len, pdp_info->qos_enc);
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}
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if (pdp_info->pdp_charg_enc) {
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msgb_tlv_put(msg, OSMO_GSUP_CHARG_CHAR_IE,
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pdp_info->pdp_charg_enc_len, pdp_info->pdp_charg_enc);
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}
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/* Update length field */
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*len_field = msgb_length(msg) - old_len;
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}
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static void encode_auth_info(struct msgb *msg, enum osmo_gsup_iei iei,
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const struct osmo_auth_vector *auth_vector)
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{
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uint8_t *len_field;
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size_t old_len;
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len_field = msgb_tlv_put(msg, iei, 0, NULL) - 1;
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old_len = msgb_length(msg);
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if (auth_vector->auth_types & OSMO_AUTH_TYPE_GSM) {
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msgb_tlv_put(msg, OSMO_GSUP_RAND_IE,
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sizeof(auth_vector->rand), auth_vector->rand);
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msgb_tlv_put(msg, OSMO_GSUP_SRES_IE,
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sizeof(auth_vector->sres), auth_vector->sres);
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msgb_tlv_put(msg, OSMO_GSUP_KC_IE,
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sizeof(auth_vector->kc), auth_vector->kc);
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}
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if (auth_vector->auth_types & OSMO_AUTH_TYPE_UMTS) {
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msgb_tlv_put(msg, OSMO_GSUP_IK_IE,
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sizeof(auth_vector->ik), auth_vector->ik);
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msgb_tlv_put(msg, OSMO_GSUP_CK_IE,
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sizeof(auth_vector->ck), auth_vector->ck);
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msgb_tlv_put(msg, OSMO_GSUP_AUTN_IE,
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sizeof(auth_vector->autn), auth_vector->autn);
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msgb_tlv_put(msg, OSMO_GSUP_RES_IE,
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auth_vector->res_len, auth_vector->res);
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}
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/* Update length field */
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*len_field = msgb_length(msg) - old_len;
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}
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/*! Encode a GSUP message
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* \param[out] msg message buffer to which encoded message is written
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* \param[in] gsup_msg \ref osmo_gsup_message data to be encoded
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* \returns 0 on success; negative otherwise
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*/
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int osmo_gsup_encode(struct msgb *msg, const struct osmo_gsup_message *gsup_msg)
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{
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uint8_t u8;
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int idx;
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uint8_t bcd_buf[GSM48_MI_SIZE] = {0};
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size_t bcd_len;
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/* generic part */
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if(!gsup_msg->message_type)
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return -ENOMEM;
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msgb_v_put(msg, gsup_msg->message_type);
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bcd_len = gsm48_encode_bcd_number(bcd_buf, sizeof(bcd_buf), 0,
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gsup_msg->imsi);
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if (bcd_len <= 0 || bcd_len > sizeof(bcd_buf))
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return -EINVAL;
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/* Note that gsm48_encode_bcd_number puts the length into the first
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* octet. Since msgb_tlv_put will add this length byte, we'll have to
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* skip it */
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msgb_tlv_put(msg, OSMO_GSUP_IMSI_IE, bcd_len - 1, &bcd_buf[1]);
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/* specific parts */
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if (gsup_msg->msisdn_enc)
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msgb_tlv_put(msg, OSMO_GSUP_MSISDN_IE,
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gsup_msg->msisdn_enc_len, gsup_msg->msisdn_enc);
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if (gsup_msg->hlr_enc)
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msgb_tlv_put(msg, OSMO_GSUP_HLR_NUMBER_IE,
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gsup_msg->hlr_enc_len, gsup_msg->hlr_enc);
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if ((u8 = gsup_msg->cause))
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msgb_tlv_put(msg, OSMO_GSUP_CAUSE_IE, sizeof(u8), &u8);
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if ((u8 = gsup_msg->cancel_type)) {
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u8 -= 1;
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msgb_tlv_put(msg, OSMO_GSUP_CANCEL_TYPE_IE, sizeof(u8), &u8);
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}
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if (gsup_msg->pdp_info_compl)
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msgb_tlv_put(msg, OSMO_GSUP_PDP_INFO_COMPL_IE, 0, &u8);
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if (gsup_msg->freeze_ptmsi)
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msgb_tlv_put(msg, OSMO_GSUP_FREEZE_PTMSI_IE, 0, &u8);
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for (idx = 0; idx < gsup_msg->num_pdp_infos; idx++) {
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const struct osmo_gsup_pdp_info *pdp_info;
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pdp_info = &gsup_msg->pdp_infos[idx];
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if (pdp_info->context_id == 0)
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continue;
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if (pdp_info->have_info) {
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encode_pdp_info(msg, OSMO_GSUP_PDP_INFO_IE, pdp_info);
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} else {
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u8 = pdp_info->context_id;
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msgb_tlv_put(msg, OSMO_GSUP_PDP_CONTEXT_ID_IE,
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sizeof(u8), &u8);
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}
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}
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for (idx = 0; idx < gsup_msg->num_auth_vectors; idx++) {
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const struct osmo_auth_vector *auth_vector;
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|
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auth_vector = &gsup_msg->auth_vectors[idx];
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encode_auth_info(msg, OSMO_GSUP_AUTH_TUPLE_IE, auth_vector);
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}
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if (gsup_msg->auts)
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msgb_tlv_put(msg, OSMO_GSUP_AUTS_IE, 14, gsup_msg->auts);
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if (gsup_msg->rand)
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msgb_tlv_put(msg, OSMO_GSUP_RAND_IE, 16, gsup_msg->rand);
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if (gsup_msg->cn_domain) {
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uint8_t dn = gsup_msg->cn_domain;
|
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msgb_tlv_put(msg, OSMO_GSUP_CN_DOMAIN_IE, 1, &dn);
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}
|
|
|
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if (gsup_msg->pdp_charg_enc) {
|
|
msgb_tlv_put(msg, OSMO_GSUP_CHARG_CHAR_IE,
|
|
gsup_msg->pdp_charg_enc_len, gsup_msg->pdp_charg_enc);
|
|
}
|
|
|
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return 0;
|
|
}
|
|
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/*! @} */
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