SecurityModeControl.c 42 KB
Newer Older
Cedric Roux's avatar
 
Cedric Roux committed
1
/*****************************************************************************
Cedric Roux's avatar
Cedric Roux committed
2 3
            Eurecom OpenAirInterface 3
            Copyright(c) 2012 Eurecom
Cedric Roux's avatar
 
Cedric Roux committed
4

Cedric Roux's avatar
Cedric Roux committed
5
Source      SecurityModeControl.c
Cedric Roux's avatar
 
Cedric Roux committed
6

Cedric Roux's avatar
Cedric Roux committed
7
Version     0.1
Cedric Roux's avatar
 
Cedric Roux committed
8

Cedric Roux's avatar
Cedric Roux committed
9
Date        2013/04/22
Cedric Roux's avatar
 
Cedric Roux committed
10

Cedric Roux's avatar
Cedric Roux committed
11
Product     NAS stack
Cedric Roux's avatar
 
Cedric Roux committed
12

Cedric Roux's avatar
Cedric Roux committed
13
Subsystem   Template body file
Cedric Roux's avatar
 
Cedric Roux committed
14

Cedric Roux's avatar
Cedric Roux committed
15
Author      Frederic Maurel
Cedric Roux's avatar
 
Cedric Roux committed
16

Cedric Roux's avatar
Cedric Roux committed
17 18
Description Defines the security mode control EMM procedure executed by the
        Non-Access Stratum.
Cedric Roux's avatar
 
Cedric Roux committed
19

Cedric Roux's avatar
Cedric Roux committed
20 21 22 23
        The purpose of the NAS security mode control procedure is to
        take an EPS security context into use, and initialise and start
        NAS signalling security between the UE and the MME with the
        corresponding EPS NAS keys and EPS security algorithms.
Cedric Roux's avatar
 
Cedric Roux committed
24

Cedric Roux's avatar
Cedric Roux committed
25 26 27
        Furthermore, the network may also initiate a SECURITY MODE COM-
        MAND in order to change the NAS security algorithms for a cur-
        rent EPS security context already in use.
Cedric Roux's avatar
 
Cedric Roux committed
28 29 30 31 32 33 34 35 36 37 38 39

*****************************************************************************/

#include "emm_proc.h"
#include "nas_log.h"
#include "nas_timer.h"

#include "emmData.h"

#include "emm_sap.h"
#include "emm_cause.h"

Cedric Roux's avatar
Cedric Roux committed
40 41
#include <stdlib.h> // malloc, free
#include <string.h> // memcpy
42 43 44 45 46
#include <inttypes.h>

#if defined(ENABLE_ITTI)
# include "assertions.h"
#endif
Cedric Roux's avatar
 
Cedric Roux committed
47 48 49 50 51 52 53 54 55 56 57 58 59 60 61

/****************************************************************************/
/****************  E X T E R N A L    D E F I N I T I O N S  ****************/
/****************************************************************************/

/****************************************************************************/
/*******************  L O C A L    D E F I N I T I O N S  *******************/
/****************************************************************************/

/*
 * --------------------------------------------------------------------------
 *  Internal data handled by the security mode control procedure in the UE
 * --------------------------------------------------------------------------
 */
#ifdef NAS_UE
Cedric Roux's avatar
Cedric Roux committed
62 63
static int _security_kdf(const OctetString *kasme, OctetString *key,
                         UInt8_t algo_dist, UInt8_t algo_id);
Cedric Roux's avatar
 
Cedric Roux committed
64

Cedric Roux's avatar
Cedric Roux committed
65 66 67 68 69 70
static int _security_knas_enc(const OctetString *kasme, OctetString *knas_enc,
                              UInt8_t eia);
static int _security_knas_int(const OctetString *kasme, OctetString *knas_int,
                              UInt8_t eea);
static int _security_kenb(const OctetString *kasme, OctetString *kenb,
                          UInt32_t count);
Cedric Roux's avatar
 
Cedric Roux committed
71 72 73 74 75

/*
 * Internal data used for security mode control procedure
 */
static struct {
Cedric Roux's avatar
Cedric Roux committed
76
    OctetString kenb;           /* eNodeB security key      */
Cedric Roux's avatar
 
Cedric Roux committed
77 78
} _security_data;

Cedric Roux's avatar
Cedric Roux committed
79 80
static void _security_release(emm_security_context_t *ctx);
#endif  // NAS_UE
Cedric Roux's avatar
 
Cedric Roux committed
81 82 83 84 85 86 87 88 89 90

/*
 * --------------------------------------------------------------------------
 *  Internal data handled by the security mode control procedure in the MME
 * --------------------------------------------------------------------------
 */
#ifdef NAS_MME
/*
 * Timer handlers
 */
Cedric Roux's avatar
Cedric Roux committed
91
static void *_security_t3460_handler(void *);
Cedric Roux's avatar
 
Cedric Roux committed
92 93 94 95 96 97

/*
 * Function executed whenever the ongoing EMM procedure that initiated
 * the security mode control procedure is aborted or the maximum value of the
 * retransmission timer counter is exceed
 */
Cedric Roux's avatar
Cedric Roux committed
98
static int _security_abort(void *);
Cedric Roux's avatar
 
Cedric Roux committed
99 100 101 102 103

/*
 * Internal data used for security mode control procedure
 */
typedef struct {
Cedric Roux's avatar
Cedric Roux committed
104 105 106 107 108 109 110 111 112
    unsigned int ueid;          /* UE identifier        */
#define SECURITY_COUNTER_MAX    5
    unsigned int retransmission_count;  /* Retransmission counter   */
    int ksi;                /* NAS key set identifier   */
    int eea;            /* Replayed EPS encryption algorithms   */
    int eia;            /* Replayed EPS integrity algorithms    */
    int notify_failure;     /* Indicates whether the security mode control
                 * procedure failure shall be notified to the
                 * ongoing EMM procedure        */
Cedric Roux's avatar
 
Cedric Roux committed
113 114
} security_data_t;

Cedric Roux's avatar
Cedric Roux committed
115
static int _security_request(security_data_t *data, int is_new);
Cedric Roux's avatar
 
Cedric Roux committed
116 117 118 119 120 121 122 123
#endif // NAS_MME

/****************************************************************************/
/******************  E X P O R T E D    F U N C T I O N S  ******************/
/****************************************************************************/

/*
 * --------------------------------------------------------------------------
Cedric Roux's avatar
Cedric Roux committed
124
 *      Security mode control procedure executed by the UE
Cedric Roux's avatar
 
Cedric Roux committed
125 126 127 128 129
 * --------------------------------------------------------------------------
 */
#ifdef NAS_UE
/****************************************************************************
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
130
 ** Name:    emm_proc_security_mode_command()                          **
Cedric Roux's avatar
 
Cedric Roux committed
131 132
 **                                                                        **
 ** Description: Performs the MME requested security mode control proce-   **
Cedric Roux's avatar
Cedric Roux committed
133
 **      dure.                                                     **
Cedric Roux's avatar
 
Cedric Roux committed
134 135
 **                                                                        **
 **              3GPP TS 24.301, section 5.4.3.3                           **
Cedric Roux's avatar
Cedric Roux committed
136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154
 **      Upon receiving the SECURITY MODE COMMAND message, the UE  **
 **      shall check whether the message can be accepted or not.   **
 **      If accepted the UE shall send a SECURITY MODE COMPLETE    **
 **      message integrity protected with the selected NAS inte-   **
 **      grity algorithm and ciphered with the selected NAS ciphe- **
 **      ring algorithm.                                           **
 **                                                                        **
 ** Inputs:  native_ksi:    TRUE if the security context is of type    **
 **             native (for KSIASME)                       **
 **      ksi:       The NAS ket sey identifier                 **
 **      seea:      Selected EPS cyphering algorithm           **
 **      seia:      Selected EPS integrity algorithm           **
 **      reea:      Replayed EPS cyphering algorithm           **
 **      reia:      Replayed EPS integrity algorithm           **
 **      Others:    None                                       **
 **                                                                        **
 ** Outputs:     None                                                      **
 **      Return:    RETURNok, RETURNerror                      **
 **      Others:    None                                       **
Cedric Roux's avatar
 
Cedric Roux committed
155 156 157
 **                                                                        **
 ***************************************************************************/
int emm_proc_security_mode_command(int native_ksi, int ksi,
Cedric Roux's avatar
Cedric Roux committed
158
                                   int seea, int seia, int reea, int reia)
Cedric Roux's avatar
 
Cedric Roux committed
159 160 161 162 163 164 165 166
{
    LOG_FUNC_IN;

    int rc = RETURNerror;
    int emm_cause = EMM_CAUSE_SUCCESS;
    int security_context_is_new = FALSE;

    LOG_TRACE(INFO, "EMM-PROC  - Security mode control requested (ksi=%d)",
Cedric Roux's avatar
Cedric Roux committed
167
              ksi);
Cedric Roux's avatar
 
Cedric Roux committed
168 169 170 171 172 173 174 175 176 177

    /* Delete any previously stored RAND and RES and stop timer T3416 */
    (void) emm_proc_authentication_delete();

    /*
     * Check the replayed UE security capabilities
     */
    UInt8_t eea = (0x80 >> _emm_data.security->capability.encryption);
    UInt8_t eia = (0x80 >> _emm_data.security->capability.integrity);
    if ( (reea != eea) || (reia != eia) ) {
Cedric Roux's avatar
Cedric Roux committed
178 179 180 181 182 183 184 185 186
        LOG_TRACE(WARNING, "EMM-PROC  - Replayed UE security capabilities "
                  "rejected");
        emm_cause = EMM_CAUSE_UE_SECURITY_MISMATCH;

        /* XXX - For testing purpose UE always accepts EIA0
         * The UE shall accept "null integrity protection algorithm" EIA0 only
         * if a PDN connection for emergency bearer services is established or
         * the UE is establishing a PDN connection for emergency bearer services
         */
Cedric Roux's avatar
 
Cedric Roux committed
187 188 189 190 191
    }
    /*
     * Check the non-current EPS security context
     */
    else if (_emm_data.non_current == NULL) {
Cedric Roux's avatar
Cedric Roux committed
192 193 194
        LOG_TRACE(WARNING, "EMM-PROC  - Non-current EPS security context "
                  "is not valid");
        emm_cause = EMM_CAUSE_SECURITY_MODE_REJECTED;
Cedric Roux's avatar
 
Cedric Roux committed
195 196 197 198 199
    }
    /*
     * Update the non-current EPS security context
     */
    else {
Cedric Roux's avatar
Cedric Roux committed
200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296
        /* Update selected cyphering and integrity algorithms */
        _emm_data.non_current->capability.encryption = seea;
        _emm_data.non_current->capability.integrity = seia;

        /* Derive the NAS cyphering key */
        if (_emm_data.non_current->knas_enc.value == NULL) {
            _emm_data.non_current->knas_enc.value =
                (uint8_t *)malloc(AUTH_KNAS_ENC_SIZE);
            _emm_data.non_current->knas_enc.length = AUTH_KNAS_ENC_SIZE;
        }
        if (_emm_data.non_current->knas_enc.value != NULL) {
            rc = _security_knas_enc(&_emm_data.non_current->kasme,
                                    &_emm_data.non_current->knas_enc, seea);
        }
        /* Derive the NAS integrity key */
        if (_emm_data.non_current->knas_int.value == NULL) {
            _emm_data.non_current->knas_int.value =
                (uint8_t *)malloc(AUTH_KNAS_INT_SIZE);
            _emm_data.non_current->knas_int.length = AUTH_KNAS_INT_SIZE;
        }
        if (_emm_data.non_current->knas_int.value != NULL) {
            if (rc != RETURNerror) {
                rc = _security_knas_int(&_emm_data.non_current->kasme,
                                        &_emm_data.non_current->knas_int, seea);
            }
        }
        /* Derive the eNodeB key */
        if (_security_data.kenb.value == NULL) {
            _security_data.kenb.value = (uint8_t *)malloc(AUTH_KENB_SIZE);
            _security_data.kenb.length = AUTH_KENB_SIZE;
        }
        if (_security_data.kenb.value != NULL) {
            if (rc != RETURNerror) {
                rc = _security_kenb(&_security_data.kenb,
                                    &_emm_data.security->kasme,
                                    *(UInt32_t *)(&_emm_data.non_current->ul_count));
            }
        }

        /*
         * NAS security mode command accepted by the UE
         */
        if (rc != RETURNerror) {
            /* Update the current EPS security context */
            if ( native_ksi && (_emm_data.security->type != EMM_KSI_NATIVE) ) {
                /* The type of security context flag included in the SECURITY
                 * MODE COMMAND message is set to "native security context" and
                 * the UE has a mapped EPS security context as the current EPS
                 * security context */
                if ( (_emm_data.non_current->type == EMM_KSI_NATIVE) &&
                        (_emm_data.non_current->eksi == ksi) ) {
                    /* The KSI matches the non-current native EPS security
                     * context; the UE shall take the non-current native EPS
                     * security context into use which then becomes the
                     * current native EPS security context and delete the
                     * mapped EPS security context */
                    LOG_TRACE(INFO,
                              "EMM-PROC  - Update Current security context");
                    /* Release non-current security context */
                    _security_release(_emm_data.security);
                    _emm_data.security = _emm_data.non_current;
                    /* Reset the uplink NAS COUNT counter */
                    _emm_data.security->ul_count.overflow = 0;
                    _emm_data.security->ul_count.seq_num = 0;
                    /* Set new security context indicator */
                    security_context_is_new = TRUE;
                }
            }

            if ( !native_ksi && (_emm_data.security->type != EMM_KSI_NATIVE) ) {
                /* The type of security context flag included in the SECURITY
                 * MODE COMMAND message is set to "mapped security context" and
                 * the UE has a mapped EPS security context as the current EPS
                 * security context */
                if (ksi != _emm_data.security->eksi) {
                    /* The KSI does not match the current EPS security context;
                     * the UE shall reset the uplink NAS COUNT counter */
                    LOG_TRACE(INFO,
                              "EMM-PROC  - Reset uplink NAS COUNT counter");
                    _emm_data.security->ul_count.overflow = 0;
                    _emm_data.security->ul_count.seq_num = 0;
                }
            }
        }
        /*
         * NAS security mode command not accepted by the UE
         */
        else {
            /* Setup EMM cause code */
            emm_cause = EMM_CAUSE_SECURITY_MODE_REJECTED;
            /* Release security mode control internal data */
            if (_security_data.kenb.value) {
                free(_security_data.kenb.value);
                _security_data.kenb.value = NULL;
                _security_data.kenb.length = 0;
            }
        }
Cedric Roux's avatar
 
Cedric Roux committed
297 298 299 300 301 302
    }

    /* Setup EMM procedure handler to be executed upon receiving
     * lower layer notification */
    rc = emm_proc_lowerlayer_initialize(NULL, NULL, NULL, NULL);
    if (rc != RETURNok) {
Cedric Roux's avatar
Cedric Roux committed
303 304 305
        LOG_TRACE(WARNING,
                  "EMM-PROC  - Failed to initialize EMM procedure handler");
        LOG_FUNC_RETURN (RETURNerror);
Cedric Roux's avatar
 
Cedric Roux committed
306 307 308 309 310 311 312 313 314 315 316 317 318 319
    }

    /*
     * Notify EMM-AS SAP that Security Mode response message has to be sent
     * to the network
     */
    emm_sap_t emm_sap;
    emm_sap.primitive = EMMAS_SECURITY_RES;
    emm_sap.u.emm_as.u.security.guti = _emm_data.guti;
    emm_sap.u.emm_as.u.security.ueid = 0;
    emm_sap.u.emm_as.u.security.msgType = EMM_AS_MSG_TYPE_SMC;
    emm_sap.u.emm_as.u.security.emm_cause = emm_cause;
    /* Setup EPS NAS security data */
    emm_as_set_security_data(&emm_sap.u.emm_as.u.security.sctx,
Cedric Roux's avatar
Cedric Roux committed
320
                             _emm_data.security, security_context_is_new, TRUE);
Cedric Roux's avatar
 
Cedric Roux committed
321 322 323 324 325 326 327 328
    rc = emm_sap_send(&emm_sap);

    LOG_FUNC_RETURN (rc);
}
#endif // NAS_UE

/*
 * --------------------------------------------------------------------------
Cedric Roux's avatar
Cedric Roux committed
329
 *      Security mode control procedure executed by the MME
Cedric Roux's avatar
 
Cedric Roux committed
330 331 332 333 334
 * --------------------------------------------------------------------------
 */
#ifdef NAS_MME
/****************************************************************************
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
335
 ** Name:    emm_proc_security_mode_control()                          **
Cedric Roux's avatar
 
Cedric Roux committed
336 337 338 339
 **                                                                        **
 ** Description: Initiates the security mode control procedure.            **
 **                                                                        **
 **              3GPP TS 24.301, section 5.4.3.2                           **
Cedric Roux's avatar
Cedric Roux committed
340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363
 **      The MME initiates the NAS security mode control procedure **
 **      by sending a SECURITY MODE COMMAND message to the UE and  **
 **      starting timer T3460. The message shall be sent unciphe-  **
 **      red but shall be integrity protected using the NAS inte-  **
 **      grity key based on KASME.                                 **
 **                                                                        **
 ** Inputs:  ueid:      UE lower layer identifier                  **
 **      ksi:       NAS key set identifier                     **
 **      eea:       Replayed EPS encryption algorithms         **
 **      eia:       Replayed EPS integrity algorithms          **
 **      success:   Callback function executed when the secu-  **
 **             rity mode control procedure successfully   **
 **             completes                                  **
 **      reject:    Callback function executed when the secu-  **
 **             rity mode control procedure fails or is    **
 **             rejected                                   **
 **      failure:   Callback function executed whener a lower  **
 **             layer failure occured before the security  **
 **             mode control procedure comnpletes          **
 **      Others:    None                                       **
 **                                                                        **
 ** Outputs:     None                                                      **
 **      Return:    RETURNok, RETURNerror                      **
 **      Others:    None                                       **
Cedric Roux's avatar
 
Cedric Roux committed
364 365 366
 **                                                                        **
 ***************************************************************************/
int emm_proc_security_mode_control(unsigned int ueid, int ksi, int eea, int eia,
Cedric Roux's avatar
Cedric Roux committed
367 368 369
                                   emm_common_success_callback_t success,
                                   emm_common_reject_callback_t reject,
                                   emm_common_failure_callback_t failure)
Cedric Roux's avatar
 
Cedric Roux committed
370 371 372 373 374 375 376
{
    LOG_FUNC_IN;

    int rc = RETURNerror;
    int security_context_is_new = FALSE;

    LOG_TRACE(INFO, "EMM-PROC  - Initiate security mode control procedure "
Cedric Roux's avatar
Cedric Roux committed
377
              "KSI = %d", ksi);
Cedric Roux's avatar
 
Cedric Roux committed
378 379

    /* Get the UE context */
Cedric Roux's avatar
Cedric Roux committed
380
    emm_data_context_t *emm_ctx = NULL;
Cedric Roux's avatar
 
Cedric Roux committed
381 382 383 384 385 386 387 388 389 390 391 392

#if defined(EPC_BUILD)
    if (ueid > 0) {
        emm_ctx = emm_data_context_get(&_emm_data, ueid);
    }
#else
    if (ueid < EMM_DATA_NB_UE_MAX) {
        emm_ctx = _emm_data.ctx[ueid];
    }
#endif

    if (emm_ctx && emm_ctx->security) {
Cedric Roux's avatar
Cedric Roux committed
393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409
        if (emm_ctx->security->type == EMM_KSI_NOT_AVAILABLE) {
            /* The security mode control procedure is initiated to take into use
             * the EPS security context created after a successful execution of
             * the EPS authentication procedure */
            emm_ctx->security->type = EMM_KSI_NATIVE;
            emm_ctx->security->eksi = ksi;
            emm_ctx->security->dl_count.overflow = 0;
            emm_ctx->security->dl_count.seq_num = 0;

            /* TODO !!! Compute Kasme, and NAS cyphering and integrity keys */

            /* Set new security context indicator */
            security_context_is_new = TRUE;
        }
    } else {
        LOG_TRACE(WARNING, "EMM-PROC  - No EPS security context exists");
        LOG_FUNC_RETURN (RETURNerror);
Cedric Roux's avatar
 
Cedric Roux committed
410 411 412
    }

    /* Allocate parameters of the retransmission timer callback */
Cedric Roux's avatar
Cedric Roux committed
413 414
    security_data_t *data =
        (security_data_t *)malloc(sizeof(security_data_t));
Cedric Roux's avatar
 
Cedric Roux committed
415 416

    if (data != NULL) {
Cedric Roux's avatar
Cedric Roux committed
417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445
        /* Setup ongoing EMM procedure callback functions */
        rc = emm_proc_common_initialize(ueid, success, reject, failure,
                                        _security_abort, data);
        if (rc != RETURNok) {
            LOG_TRACE(WARNING, "Failed to initialize EMM callback functions");
            free(data);
            LOG_FUNC_RETURN (RETURNerror);
        }
        /* Set the UE identifier */
        data->ueid = ueid;
        /* Reset the retransmission counter */
        data->retransmission_count = 0;
        /* Set the key set identifier */
        data->ksi = ksi;
        /* Set the EPS encryption algorithms to be replayed to the UE */
        data->eea = eea;
        /* Set the EPS integrity algorithms to be replayed to the UE */
        data->eia = eia;
        /* Set the failure notification indicator */
        data->notify_failure = FALSE;
        /* Send security mode command message to the UE */
        rc = _security_request(data, security_context_is_new);
        if (rc != RETURNerror) {
            /*
             * Notify EMM that common procedure has been initiated
             */
            emm_sap_t emm_sap;
            emm_sap.primitive = EMMREG_COMMON_PROC_REQ;
            emm_sap.u.emm_reg.ueid = ueid;
446
            emm_sap.u.emm_reg.ctx  = emm_ctx;
Cedric Roux's avatar
Cedric Roux committed
447 448
            rc = emm_sap_send(&emm_sap);
        }
Cedric Roux's avatar
 
Cedric Roux committed
449 450 451 452 453 454 455
    }

    LOG_FUNC_RETURN (rc);
}

/****************************************************************************
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
456
 ** Name:    emm_proc_security_mode_complete()                         **
Cedric Roux's avatar
 
Cedric Roux committed
457 458
 **                                                                        **
 ** Description: Performs the security mode control completion procedure   **
Cedric Roux's avatar
Cedric Roux committed
459
 **      executed by the network.                                  **
Cedric Roux's avatar
 
Cedric Roux committed
460 461
 **                                                                        **
 **              3GPP TS 24.301, section 5.4.3.4                           **
Cedric Roux's avatar
Cedric Roux committed
462 463 464 465 466
 **      Upon receiving the SECURITY MODE COMPLETE message, the    **
 **      MME shall stop timer T3460.                               **
 **      From this time onward the MME shall integrity protect and **
 **      encipher all signalling messages with the selected NAS    **
 **      integrity and ciphering algorithms.                       **
Cedric Roux's avatar
 
Cedric Roux committed
467
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
468 469
 ** Inputs:  ueid:      UE lower layer identifier                  **
 **      Others:    None                                       **
Cedric Roux's avatar
 
Cedric Roux committed
470
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
471 472 473
 ** Outputs:     None                                                      **
 **      Return:    RETURNok, RETURNerror                      **
 **      Others:    None                                       **
Cedric Roux's avatar
 
Cedric Roux committed
474 475 476 477
 **                                                                        **
 ***************************************************************************/
int emm_proc_security_mode_complete(unsigned int ueid)
{
Cedric Roux's avatar
Cedric Roux committed
478
    emm_data_context_t *emm_ctx = NULL;
Cedric Roux's avatar
 
Cedric Roux committed
479 480 481 482 483 484 485 486 487 488 489 490 491

    int rc = RETURNerror;
    emm_sap_t emm_sap;

    LOG_FUNC_IN;

    LOG_TRACE(INFO, "EMM-PROC  - Security mode complete (ueid=%u)", ueid);

    /* Stop timer T3460 */
    LOG_TRACE(INFO, "EMM-PROC  - Stop timer T3460 (%d)", T3460.id);
    T3460.id = nas_timer_stop(T3460.id);

    /* Release retransmission timer paramaters */
Cedric Roux's avatar
Cedric Roux committed
492 493 494 495
    security_data_t *data = (security_data_t *)(emm_proc_common_get_args(ueid));
    if (data) {
        free(data);
    }
Cedric Roux's avatar
 
Cedric Roux committed
496 497 498 499 500 501 502 503 504 505 506 507 508

    /* Get the UE context */
#if defined(EPC_BUILD)
    if (ueid > 0) {
        emm_ctx = emm_data_context_get(&_emm_data, ueid);
    }
#else
    if (ueid < EMM_DATA_NB_UE_MAX) {
        emm_ctx = _emm_data.ctx[ueid];
    }
#endif

    if (emm_ctx && emm_ctx->security) {
Cedric Roux's avatar
Cedric Roux committed
509 510 511 512 513 514 515 516 517 518 519 520 521
        /*
         * Notify EMM that the authentication procedure successfully completed
         */
        emm_sap.primitive = EMMREG_COMMON_PROC_CNF;
        emm_sap.u.emm_reg.ueid = ueid;
        emm_sap.u.emm_reg.u.common.is_attached = emm_ctx->is_attached;
    } else {
        LOG_TRACE(ERROR, "EMM-PROC  - No EPS security context exists");
        /*
         * Notify EMM that the authentication procedure failed
         */
        emm_sap.primitive = EMMREG_COMMON_PROC_REJ;
        emm_sap.u.emm_reg.ueid = ueid;
Cedric Roux's avatar
 
Cedric Roux committed
522 523 524 525 526 527 528 529 530
    }

    rc = emm_sap_send(&emm_sap);

    LOG_FUNC_RETURN (rc);
}

/****************************************************************************
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
531
 ** Name:    emm_proc_security_mode_reject()                           **
Cedric Roux's avatar
 
Cedric Roux committed
532 533 534 535
 **                                                                        **
 ** Description: Performs the security mode control not accepted by the UE **
 **                                                                        **
 **              3GPP TS 24.301, section 5.4.3.5                           **
Cedric Roux's avatar
Cedric Roux committed
536 537 538 539 540 541 542
 **      Upon receiving the SECURITY MODE REJECT message, the MME  **
 **      shall stop timer T3460 and abort the ongoing procedure    **
 **      that triggered the initiation of the NAS security mode    **
 **      control procedure.                                        **
 **      The MME shall apply the EPS security context in use befo- **
 **      re the initiation of the security mode control procedure, **
 **      if any, to protect any subsequent messages.               **
Cedric Roux's avatar
 
Cedric Roux committed
543 544
 **                                                                        **
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
545 546
 ** Inputs:  ueid:      UE lower layer identifier                  **
 **      Others:    None                                       **
Cedric Roux's avatar
 
Cedric Roux committed
547
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
548 549 550
 ** Outputs:     None                                                      **
 **      Return:    RETURNok, RETURNerror                      **
 **      Others:    None                                       **
Cedric Roux's avatar
 
Cedric Roux committed
551 552 553 554
 **                                                                        **
 ***************************************************************************/
int emm_proc_security_mode_reject(unsigned int ueid)
{
Cedric Roux's avatar
Cedric Roux committed
555
    emm_data_context_t *emm_ctx = NULL;
Cedric Roux's avatar
 
Cedric Roux committed
556 557 558 559 560 561 562 563 564 565 566 567
    int rc = RETURNerror;

    LOG_FUNC_IN;

    LOG_TRACE(WARNING, "EMM-PROC  - Security mode command not accepted by the UE"
              "(ueid=0x%08x)", ueid);

    /* Stop timer T3460 */
    LOG_TRACE(INFO, "EMM-PROC  - Stop timer T3460 (%d)", T3460.id);
    T3460.id = nas_timer_stop(T3460.id);

    /* Release retransmission timer paramaters */
Cedric Roux's avatar
Cedric Roux committed
568 569 570 571
    security_data_t *data = (security_data_t *)(emm_proc_common_get_args(ueid));
    if (data) {
        free(data);
    }
Cedric Roux's avatar
 
Cedric Roux committed
572 573 574 575 576

    /* Get the UE context */
#if defined(EPC_BUILD)
    if (ueid > 0) {
        emm_ctx = emm_data_context_get(&_emm_data, ueid);
577
        DevAssert(emm_ctx != NULL);
Cedric Roux's avatar
 
Cedric Roux committed
578 579 580 581 582 583 584 585
    }
#else
    if (ueid < EMM_DATA_NB_UE_MAX) {
        emm_ctx = _emm_data.ctx[ueid];
    }
#endif
    /* Set the key set identifier to its previous value */
    if (emm_ctx && emm_ctx->security) {
Cedric Roux's avatar
Cedric Roux committed
586 587 588 589 590 591 592
        /* XXX - Usually, the MME should be able to maintain a current and
         * a non-current EPS security context simultaneously as the UE do.
         * This implementation choose to have only one security context by UE
         * in the MME, thus security mode control procedure is only performed
         * to take into use the first EPS security context created after a
         * successful execution of the EPS authentication procedure */
        emm_ctx->security->type = EMM_KSI_NOT_AVAILABLE;
Cedric Roux's avatar
 
Cedric Roux committed
593 594 595 596 597 598 599 600
    }

    /*
     * Notify EMM that the authentication procedure failed
     */
    emm_sap_t emm_sap;
    emm_sap.primitive = EMMREG_COMMON_PROC_REJ;
    emm_sap.u.emm_reg.ueid = ueid;
601
    emm_sap.u.emm_reg.ctx  = emm_ctx;
Cedric Roux's avatar
 
Cedric Roux committed
602 603 604 605 606 607 608 609 610 611 612 613 614
    rc = emm_sap_send(&emm_sap);

    LOG_FUNC_RETURN (rc);
}
#endif // NAS_MME

/****************************************************************************/
/*********************  L O C A L    F U N C T I O N S  *********************/
/****************************************************************************/

#ifdef NAS_UE
/*
 * --------------------------------------------------------------------------
Cedric Roux's avatar
Cedric Roux committed
615
 *              UE specific local functions
Cedric Roux's avatar
 
Cedric Roux committed
616 617 618 619 620
 * --------------------------------------------------------------------------
 */

/****************************************************************************
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
621
 ** Name:    _security_release()                                       **
Cedric Roux's avatar
 
Cedric Roux committed
622 623 624
 **                                                                        **
 ** Description: Releases the given EPS NAS security context               **
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
625 626
 ** Inputs:  ctx:       The EPS NAS security context to release    **
 **      Others:    None                                       **
Cedric Roux's avatar
 
Cedric Roux committed
627
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
628 629 630
 ** Outputs:     None                                                      **
 **      Return:    None                                       **
 **      Others:    None                                       **
Cedric Roux's avatar
 
Cedric Roux committed
631 632
 **                                                                        **
 ***************************************************************************/
Cedric Roux's avatar
Cedric Roux committed
633
static void _security_release(emm_security_context_t *ctx)
Cedric Roux's avatar
 
Cedric Roux committed
634 635 636 637
{
    LOG_FUNC_IN;

    if (ctx) {
Cedric Roux's avatar
Cedric Roux committed
638 639 640 641 642 643 644 645 646 647 648 649 650 651
        /* Release Kasme security key */
        if (ctx->kasme.value) {
            free(ctx->kasme.value);
        }
        /* Release NAS cyphering key */
        if (ctx->knas_enc.value) {
            free(ctx->knas_enc.value);
        }
        /* Release NAS integrity key */
        if (ctx->knas_int.value) {
            free(ctx->knas_int.value);
        }
        /* Release the NAS security context */
        free(ctx);
Cedric Roux's avatar
 
Cedric Roux committed
652 653 654 655 656 657 658
    }

    LOG_FUNC_OUT;
}

/****************************************************************************
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
659
 ** Name:    _security_knas_enc()                                      **
Cedric Roux's avatar
 
Cedric Roux committed
660 661
 **                                                                        **
 ** Description: Algorithm Key generation function used for the derivation **
Cedric Roux's avatar
Cedric Roux committed
662
 **      of NAS encryption key Knas-enc from the Kasme.            **
Cedric Roux's avatar
 
Cedric Roux committed
663 664 665
 **                                                                        **
 **              3GPP TS 33.401, Annex A.7                                 **
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
666 667 668
 ** Inputs:  kasme:     Key Access Security Management Entity      **
 **      eea:       Cyphering algorithm identity               **
 **      Others:    None                                       **
Cedric Roux's avatar
 
Cedric Roux committed
669
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
670 671 672
 ** Outputs:     knas_enc:  Derived key for NAS cyphering algorithm    **
 **      Return:    RETURNok, RETURNerror                      **
 **      Others:    None                                       **
Cedric Roux's avatar
 
Cedric Roux committed
673 674
 **                                                                        **
 ***************************************************************************/
Cedric Roux's avatar
Cedric Roux committed
675 676
static int _security_knas_enc(const OctetString *kasme, OctetString *knas_enc,
                              UInt8_t eea)
Cedric Roux's avatar
 
Cedric Roux committed
677 678 679 680 681 682 683
{
    LOG_FUNC_IN;
    LOG_FUNC_RETURN (_security_kdf(kasme, knas_enc, 0x01, eea));
}

/****************************************************************************
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
684
 ** Name:    _security_knas_int()                                      **
Cedric Roux's avatar
 
Cedric Roux committed
685 686
 **                                                                        **
 ** Description: Algorithm Key generation function used for the derivation **
Cedric Roux's avatar
Cedric Roux committed
687
 **      of NAS integrity key Knas-int from the Kasme.             **
Cedric Roux's avatar
 
Cedric Roux committed
688 689 690
 **                                                                        **
 **              3GPP TS 33.401, Annex A.7                                 **
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
691 692 693
 ** Inputs:  kasme:     Key Access Security Management Entity      **
 **      eia:       Integrity algorithm identity               **
 **      Others:    None                                       **
Cedric Roux's avatar
 
Cedric Roux committed
694
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
695 696 697
 ** Outputs:     knas_int:  Derived key for NAS integrity algorithm    **
 **      Return:    RETURNok, RETURNerror                      **
 **      Others:    None                                       **
Cedric Roux's avatar
 
Cedric Roux committed
698 699
 **                                                                        **
 ***************************************************************************/
Cedric Roux's avatar
Cedric Roux committed
700 701
static int _security_knas_int(const OctetString *kasme, OctetString *knas_int,
                              UInt8_t eia)
Cedric Roux's avatar
 
Cedric Roux committed
702 703 704 705 706 707 708
{
    LOG_FUNC_IN;
    LOG_FUNC_RETURN (_security_kdf(kasme, knas_int, 0x02, eia));
}

/****************************************************************************
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
709
 ** Name:    _security_kenb()                                          **
Cedric Roux's avatar
 
Cedric Roux committed
710 711
 **                                                                        **
 ** Description: Computes the eNodeB key from Kasme and the given value of **
Cedric Roux's avatar
Cedric Roux committed
712
 **      uplink NAS counter.                                       **
Cedric Roux's avatar
 
Cedric Roux committed
713 714 715
 **                                                                        **
 **              3GPP TS 33.401, Annex A.3                                 **
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
716 717 718
 ** Inputs:  kasme:     Key Access Security Management Entity      **
 **      count:     Uplink NAS counter value                   **
 **      Others:    None                                       **
Cedric Roux's avatar
 
Cedric Roux committed
719
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
720 721 722
 ** Outputs:     kenb:      eNodeB security key                        **
 **      Return:    RETURNok, RETURNerror                      **
 **      Others:    None                                       **
Cedric Roux's avatar
 
Cedric Roux committed
723 724
 **                                                                        **
 ***************************************************************************/
Cedric Roux's avatar
Cedric Roux committed
725 726
static int _security_kenb(const OctetString *kasme, OctetString *kenb,
                          UInt32_t count)
Cedric Roux's avatar
 
Cedric Roux committed
727 728 729 730 731 732 733 734
{
    /* Compute the KDF input parameter
     * S = FC(0x11) || UL NAS Count || 0x00 0x04
     */
    UInt8_t input[kasme->length];
    UInt16_t length = 4;
    int offset = 0;

Cedric Roux's avatar
Cedric Roux committed
735 736 737 738
    input[offset] = 0x11;
    offset += 1;
    input[offset] = count;
    offset += length;
Cedric Roux's avatar
 
Cedric Roux committed
739 740 741 742 743 744 745 746 747
    input[offset] = length;

    /* TODO !!! Compute the derived key */
    // todo_hmac_256(key, input, kasme->value);
    return (RETURNok);
}

/****************************************************************************
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
748
 ** Name:    _security_kdf()                                           **
Cedric Roux's avatar
 
Cedric Roux committed
749 750
 **                                                                        **
 ** Description: Algorithm Key generation function used for the derivation **
Cedric Roux's avatar
Cedric Roux committed
751 752
 **      of keys for NAS integrity and NAS encryption algorithms   **
 **      from Kasme, algorithm types and algorithm identities.     **
Cedric Roux's avatar
 
Cedric Roux committed
753 754 755
 **                                                                        **
 **              3GPP TS 33.401, Annex A.7                                 **
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
756 757 758 759
 ** Inputs:  kasme:     Key Access Security Management Entity      **
 **      algo_dist: Algorithm type distinguisher               **
 **      algo_id:   Algorithm identity                         **
 **      Others:    None                                       **
Cedric Roux's avatar
 
Cedric Roux committed
760
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
761 762 763
 ** Outputs:     key:       Derived key for NAS security protection    **
 **      Return:    RETURNok, RETURNerror                      **
 **      Others:    None                                       **
Cedric Roux's avatar
 
Cedric Roux committed
764 765
 **                                                                        **
 ***************************************************************************/
Cedric Roux's avatar
Cedric Roux committed
766 767
static int _security_kdf(const OctetString *kasme, OctetString *key,
                         UInt8_t algo_dist, UInt8_t algo_id)
Cedric Roux's avatar
 
Cedric Roux committed
768 769 770
{
    /* Compute the KDF input parameter
     * S = FC(0x15) || Algorithm distinguisher || 0x00 0x01
Cedric Roux's avatar
Cedric Roux committed
771
            || Algorithm identity || 0x00 0x01
Cedric Roux's avatar
 
Cedric Roux committed
772 773 774 775 776 777
    */
    UInt8_t input[kasme->length];
    UInt16_t length = 1;
    int offset = 0;
    int size_of_length = sizeof(length);

Cedric Roux's avatar
Cedric Roux committed
778 779 780 781 782 783 784 785
    input[offset] = 0x15;
    offset += 1;
    input[offset] = algo_dist;
    offset += length;
    input[offset] = length;
    offset += size_of_length;
    input[offset] = algo_id;
    offset += length;
Cedric Roux's avatar
 
Cedric Roux committed
786 787 788 789 790 791 792 793 794 795 796
    input[offset] = length;

    /* TODO !!! Compute the derived key */
    // todo_hmac_256(key, input, kasme->value);
    return (RETURNok);
}
#endif // NAS_UE

#ifdef NAS_MME
/*
 * --------------------------------------------------------------------------
Cedric Roux's avatar
Cedric Roux committed
797
 *              Timer handlers
Cedric Roux's avatar
 
Cedric Roux committed
798 799 800 801 802
 * --------------------------------------------------------------------------
 */

/****************************************************************************
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
803
 ** Name:    _security_t3460_handler()                                 **
Cedric Roux's avatar
 
Cedric Roux committed
804 805
 **                                                                        **
 ** Description: T3460 timeout handler                                     **
Cedric Roux's avatar
Cedric Roux committed
806 807 808 809
 **      Upon T3460 timer expiration, the security mode command    **
 **      message is retransmitted and the timer restarted. When    **
 **      retransmission counter is exceed, the MME shall abort the **
 **      security mode control procedure.                          **
Cedric Roux's avatar
 
Cedric Roux committed
810 811 812
 **                                                                        **
 **              3GPP TS 24.301, section 5.4.3.7, case b                   **
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
813 814
 ** Inputs:  args:      handler parameters                         **
 **      Others:    None                                       **
Cedric Roux's avatar
 
Cedric Roux committed
815
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
816 817 818
 ** Outputs:     None                                                      **
 **      Return:    None                                       **
 **      Others:    None                                       **
Cedric Roux's avatar
 
Cedric Roux committed
819 820
 **                                                                        **
 ***************************************************************************/
Cedric Roux's avatar
Cedric Roux committed
821
static void *_security_t3460_handler(void *args)
Cedric Roux's avatar
 
Cedric Roux committed
822 823 824 825 826
{
    LOG_FUNC_IN;

    int rc;

Cedric Roux's avatar
Cedric Roux committed
827
    security_data_t *data = (security_data_t *)(args);
Cedric Roux's avatar
 
Cedric Roux committed
828 829 830 831 832

    /* Increment the retransmission counter */
    data->retransmission_count += 1;

    LOG_TRACE(WARNING, "EMM-PROC  - T3460 timer expired, retransmission "
Cedric Roux's avatar
Cedric Roux committed
833
              "counter = %d", data->retransmission_count);
Cedric Roux's avatar
 
Cedric Roux committed
834 835

    if (data->retransmission_count < SECURITY_COUNTER_MAX) {
Cedric Roux's avatar
Cedric Roux committed
836 837 838 839 840 841 842
        /* Send security mode command message to the UE */
        rc = _security_request(data, FALSE);
    } else {
        /* Set the failure notification indicator */
        data->notify_failure = TRUE;
        /* Abort the security mode control procedure */
        rc = _security_abort(data);
Cedric Roux's avatar
 
Cedric Roux committed
843 844 845 846 847 848 849
    }

    LOG_FUNC_RETURN (NULL);
}

/*
 * --------------------------------------------------------------------------
Cedric Roux's avatar
Cedric Roux committed
850
 *              MME specific local functions
Cedric Roux's avatar
 
Cedric Roux committed
851 852 853 854 855
 * --------------------------------------------------------------------------
 */

/****************************************************************************
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
856
 ** Name:    _security_request()                                       **
Cedric Roux's avatar
 
Cedric Roux committed
857 858 859
 **                                                                        **
 ** Description: Sends SECURITY MODE COMMAND message and start timer T3460 **
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
860 861 862 863
 ** Inputs:  data:      Security mode control internal data        **
 **      is_new:    Indicates whether a new security context   **
 **             has just been taken into use               **
 **      Others:    None                                       **
Cedric Roux's avatar
 
Cedric Roux committed
864
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
865 866 867
 ** Outputs:     None                                                      **
 **      Return:    RETURNok, RETURNerror                      **
 **      Others:    T3460                                      **
Cedric Roux's avatar
 
Cedric Roux committed
868 869
 **                                                                        **
 ***************************************************************************/
Cedric Roux's avatar
Cedric Roux committed
870
int _security_request(security_data_t *data, int is_new)
Cedric Roux's avatar
 
Cedric Roux committed
871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906
{
    struct emm_data_context_s *emm_ctx = NULL;

    emm_sap_t emm_sap;
    int rc;

    LOG_FUNC_IN;

    /*
     * Notify EMM-AS SAP that Security Mode Command message has to be sent
     * to the UE
     */
    emm_sap.primitive = EMMAS_SECURITY_REQ;
    emm_sap.u.emm_as.u.security.guti = NULL;
    emm_sap.u.emm_as.u.security.ueid = data->ueid;
    emm_sap.u.emm_as.u.security.msgType = EMM_AS_MSG_TYPE_SMC;
    emm_sap.u.emm_as.u.security.ksi = data->ksi;
    emm_sap.u.emm_as.u.security.eea = data->eea;
    emm_sap.u.emm_as.u.security.eia = data->eia;

#if defined(EPC_BUILD)
    if (data->ueid > 0) {
        emm_ctx = emm_data_context_get(&_emm_data, data->ueid);
    }
#else
    if (data->ueid < EMM_DATA_NB_UE_MAX) {
        emm_ctx = _emm_data.ctx[data->ueid];
    }
#endif

    /* Setup EPS NAS security data */
    emm_as_set_security_data(&emm_sap.u.emm_as.u.security.sctx,
                             emm_ctx->security, is_new, FALSE);
    rc = emm_sap_send(&emm_sap);

    if (rc != RETURNerror) {
Cedric Roux's avatar
Cedric Roux committed
907 908 909 910 911 912 913 914 915
        if (T3460.id != NAS_TIMER_INACTIVE_ID) {
            /* Re-start T3460 timer */
            T3460.id = nas_timer_restart(T3460.id);
        } else {
            /* Start T3460 timer */
            T3460.id = nas_timer_start(T3460.sec, _security_t3460_handler, data);
        }
        LOG_TRACE(INFO,"EMM-PROC  - Timer T3460 (%d) expires in %ld seconds",
                  T3460.id, T3460.sec);
Cedric Roux's avatar
 
Cedric Roux committed
916 917 918 919 920 921 922
    }

    LOG_FUNC_RETURN (rc);
}

/****************************************************************************
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
923
 ** Name:    _security_abort()                                         **
Cedric Roux's avatar
 
Cedric Roux committed
924 925
 **                                                                        **
 ** Description: Aborts the security mode control procedure currently in   **
Cedric Roux's avatar
Cedric Roux committed
926
 **      progress                                                  **
Cedric Roux's avatar
 
Cedric Roux committed
927
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
928 929
 ** Inputs:  args:      Security mode control data to be released  **
 **      Others:    None                                       **
Cedric Roux's avatar
 
Cedric Roux committed
930
 **                                                                        **
Cedric Roux's avatar
Cedric Roux committed
931 932 933
 ** Outputs:     None                                                      **
 **      Return:    RETURNok, RETURNerror                      **
 **      Others:    T3460                                      **
Cedric Roux's avatar
 
Cedric Roux committed
934 935
 **                                                                        **
 ***************************************************************************/
Cedric Roux's avatar
Cedric Roux committed
936
static int _security_abort(void *args)
Cedric Roux's avatar
 
Cedric Roux committed
937 938 939 940 941
{
    LOG_FUNC_IN;

    int rc = RETURNerror;

Cedric Roux's avatar
Cedric Roux committed
942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969
    security_data_t *data = (security_data_t *)(args);

    if (data) {
        unsigned int ueid = data->ueid;
        int notify_failure = data->notify_failure;

        LOG_TRACE(WARNING, "EMM-PROC  - Abort security mode control procedure "
                  "(ueid=%u)", ueid);

        /* Stop timer T3460 */
        if (T3460.id != NAS_TIMER_INACTIVE_ID) {
            LOG_TRACE(INFO, "EMM-PROC  - Stop timer T3460 (%d)", T3460.id);
            T3460.id = nas_timer_stop(T3460.id);
        }
        /* Release retransmission timer paramaters */
        free(data);

        /*
         * Notify EMM that the security mode control procedure failed
         */
        if (notify_failure) {
            emm_sap_t emm_sap;
            emm_sap.primitive = EMMREG_COMMON_PROC_REJ;
            emm_sap.u.emm_reg.ueid = ueid;
            rc = emm_sap_send(&emm_sap);
        } else {
            rc = RETURNok;
        }
Cedric Roux's avatar
 
Cedric Roux committed
970 971 972 973 974 975 976
    }

    LOG_FUNC_RETURN (rc);
}

#endif // NAS_MME