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get_in_tkt.c

/*
 * Copyright (c) 1997 - 2002 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden). 
 * All rights reserved. 
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 *
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in the 
 *    documentation and/or other materials provided with the distribution. 
 *
 * 3. Neither the name of the Institute nor the names of its contributors 
 *    may be used to endorse or promote products derived from this software 
 *    without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE. 
 */

#include "krb5_locl.h"

RCSID("$Id: get_in_tkt.c,v 1.107.2.1 2003/09/18 21:00:09 lha Exp $");

krb5_error_code
krb5_init_etype (krb5_context context,
             unsigned *len,
             krb5_enctype **val,
             const krb5_enctype *etypes)
{
    int i;
    krb5_error_code ret;
    krb5_enctype *tmp = NULL;

    ret = 0;
    if (etypes == NULL) {
      ret = krb5_get_default_in_tkt_etypes(context,
                                   &tmp);
      if (ret)
          return ret;
      etypes = tmp;
    }

    for (i = 0; etypes[i]; ++i)
      ;
    *len = i;
    *val = malloc(i * sizeof(**val));
    if (i != 0 && *val == NULL) {
      ret = ENOMEM;
      krb5_set_error_string(context, "malloc: out of memory");
      goto cleanup;
    }
    memmove (*val,
           etypes,
           i * sizeof(*tmp));
cleanup:
    if (tmp != NULL)
      free (tmp);
    return ret;
}


static krb5_error_code
decrypt_tkt (krb5_context context,
           krb5_keyblock *key,
           krb5_key_usage usage,
           krb5_const_pointer decrypt_arg,
           krb5_kdc_rep *dec_rep)
{
    krb5_error_code ret;
    krb5_data data;
    size_t size;
    krb5_crypto crypto;

    ret = krb5_crypto_init(context, key, 0, &crypto);
    if (ret)
      return ret;

    ret = krb5_decrypt_EncryptedData (context,
                              crypto,
                              usage,
                              &dec_rep->kdc_rep.enc_part,
                              &data);
    krb5_crypto_destroy(context, crypto);

    if (ret)
      return ret;

    ret = krb5_decode_EncASRepPart(context,
                           data.data,
                           data.length,
                           &dec_rep->enc_part, 
                           &size);
    if (ret)
      ret = krb5_decode_EncTGSRepPart(context,
                              data.data,
                              data.length,
                              &dec_rep->enc_part, 
                              &size);
    krb5_data_free (&data);
    if (ret)
      return ret;
    return 0;
}

int
_krb5_extract_ticket(krb5_context context, 
                 krb5_kdc_rep *rep, 
                 krb5_creds *creds,       
                 krb5_keyblock *key,
                 krb5_const_pointer keyseed,
                 krb5_key_usage key_usage,
                 krb5_addresses *addrs,
                 unsigned nonce,
                 krb5_boolean allow_server_mismatch,
                 krb5_boolean ignore_cname,
                 krb5_decrypt_proc decrypt_proc,
                 krb5_const_pointer decryptarg)
{
    krb5_error_code ret;
    krb5_principal tmp_principal;
    int tmp;
    time_t tmp_time;
    krb5_timestamp sec_now;

    ret = principalname2krb5_principal (&tmp_principal,
                              rep->kdc_rep.cname,
                              rep->kdc_rep.crealm);
    if (ret)
      goto out;

    /* compare client */

    if (!ignore_cname) {
      tmp = krb5_principal_compare (context, tmp_principal, creds->client);
      if (!tmp) {
          krb5_free_principal (context, tmp_principal);
          krb5_clear_error_string (context);
          ret = KRB5KRB_AP_ERR_MODIFIED;
          goto out;
      }
    }

    krb5_free_principal (context, creds->client);
    creds->client = tmp_principal;

    /* extract ticket */
    ASN1_MALLOC_ENCODE(Ticket, creds->ticket.data, creds->ticket.length, 
                   &rep->kdc_rep.ticket, &creds->ticket.length, ret);
    if(ret)
      goto out;
    creds->second_ticket.length = 0;
    creds->second_ticket.data   = NULL;

    /* compare server */

    ret = principalname2krb5_principal (&tmp_principal,
                              rep->kdc_rep.ticket.sname,
                              rep->kdc_rep.ticket.realm);
    if (ret)
      goto out;
    if(allow_server_mismatch){
      krb5_free_principal(context, creds->server);
      creds->server = tmp_principal;
      tmp_principal = NULL;
    }else{
      tmp = krb5_principal_compare (context, tmp_principal, creds->server);
      krb5_free_principal (context, tmp_principal);
      if (!tmp) {
          ret = KRB5KRB_AP_ERR_MODIFIED;
          krb5_clear_error_string (context);
          goto out;
      }
    }
    
    /* decrypt */

    if (decrypt_proc == NULL)
      decrypt_proc = decrypt_tkt;
    
    ret = (*decrypt_proc)(context, key, key_usage, decryptarg, rep);
    if (ret)
      goto out;

#if 0
    /* XXX should this decode be here, or in the decrypt_proc? */
    ret = krb5_decode_keyblock(context, &rep->enc_part.key, 1);
    if(ret)
      goto out;
#endif

    /* compare nonces */

    if (nonce != rep->enc_part.nonce) {
      ret = KRB5KRB_AP_ERR_MODIFIED;
      krb5_set_error_string(context, "malloc: out of memory");
      goto out;
    }

    /* set kdc-offset */

    krb5_timeofday (context, &sec_now);
    if (rep->enc_part.flags.initial
      && context->kdc_sec_offset == 0
      && krb5_config_get_bool (context, NULL,
                         "libdefaults",
                         "kdc_timesync",
                         NULL)) {
      context->kdc_sec_offset = rep->enc_part.authtime - sec_now;
      krb5_timeofday (context, &sec_now);
    }

    /* check all times */

    if (rep->enc_part.starttime) {
      tmp_time = *rep->enc_part.starttime;
    } else
      tmp_time = rep->enc_part.authtime;

    if (creds->times.starttime == 0
      && abs(tmp_time - sec_now) > context->max_skew) {
      ret = KRB5KRB_AP_ERR_SKEW;
      krb5_set_error_string (context,
                         "time skew (%d) larger than max (%d)",
                         abs(tmp_time - sec_now),
                         (int)context->max_skew);
      goto out;
    }

    if (creds->times.starttime != 0
      && tmp_time != creds->times.starttime) {
      krb5_clear_error_string (context);
      ret = KRB5KRB_AP_ERR_MODIFIED;
      goto out;
    }

    creds->times.starttime = tmp_time;

    if (rep->enc_part.renew_till) {
      tmp_time = *rep->enc_part.renew_till;
    } else
      tmp_time = 0;

    if (creds->times.renew_till != 0
      && tmp_time > creds->times.renew_till) {
      krb5_clear_error_string (context);
      ret = KRB5KRB_AP_ERR_MODIFIED;
      goto out;
    }

    creds->times.renew_till = tmp_time;

    creds->times.authtime = rep->enc_part.authtime;

    if (creds->times.endtime != 0
      && rep->enc_part.endtime > creds->times.endtime) {
      krb5_clear_error_string (context);
      ret = KRB5KRB_AP_ERR_MODIFIED;
      goto out;
    }

    creds->times.endtime  = rep->enc_part.endtime;

    if(rep->enc_part.caddr)
      krb5_copy_addresses (context, rep->enc_part.caddr, &creds->addresses);
    else if(addrs)
      krb5_copy_addresses (context, addrs, &creds->addresses);
    else {
      creds->addresses.len = 0;
      creds->addresses.val = NULL;
    }
    creds->flags.b = rep->enc_part.flags;
        
    creds->authdata.len = 0;
    creds->authdata.val = NULL;
    creds->session.keyvalue.length = 0;
    creds->session.keyvalue.data   = NULL;
    creds->session.keytype = rep->enc_part.key.keytype;
    ret = krb5_data_copy (&creds->session.keyvalue,
                    rep->enc_part.key.keyvalue.data,
                    rep->enc_part.key.keyvalue.length);

out:
    memset (rep->enc_part.key.keyvalue.data, 0,
          rep->enc_part.key.keyvalue.length);
    return ret;
}


static krb5_error_code
make_pa_enc_timestamp(krb5_context context, PA_DATA *pa, 
                  krb5_enctype etype, krb5_keyblock *key)
{
    PA_ENC_TS_ENC p;
    unsigned char *buf;
    size_t buf_size;
    size_t len;
    EncryptedData encdata;
    krb5_error_code ret;
    int32_t sec, usec;
    int usec2;
    krb5_crypto crypto;
    
    krb5_us_timeofday (context, &sec, &usec);
    p.patimestamp = sec;
    usec2         = usec;
    p.pausec      = &usec2;

    ASN1_MALLOC_ENCODE(PA_ENC_TS_ENC, buf, buf_size, &p, &len, ret);
    if (ret)
      return ret;
    if(buf_size != len)
      krb5_abortx(context, "internal error in ASN.1 encoder");
    ret = krb5_crypto_init(context, key, 0, &crypto);
    if (ret) {
      free(buf);
      return ret;
    }
    ret = krb5_encrypt_EncryptedData(context, 
                             crypto,
                             KRB5_KU_PA_ENC_TIMESTAMP,
                             buf,
                             len,
                             0,
                             &encdata);
    free(buf);
    krb5_crypto_destroy(context, crypto);
    if (ret)
      return ret;
                
    ASN1_MALLOC_ENCODE(EncryptedData, buf, buf_size, &encdata, &len, ret);
    free_EncryptedData(&encdata);
    if (ret)
      return ret;
    if(buf_size != len)
      krb5_abortx(context, "internal error in ASN.1 encoder");
    pa->padata_type = KRB5_PADATA_ENC_TIMESTAMP;
    pa->padata_value.length = len;
    pa->padata_value.data = buf;
    return 0;
}

static krb5_error_code
add_padata(krb5_context context,
         METHOD_DATA *md, 
         krb5_principal client,
         krb5_key_proc key_proc,
         krb5_const_pointer keyseed,
         krb5_enctype *enctypes,
         unsigned netypes,
         krb5_salt *salt)
{
    krb5_error_code ret;
    PA_DATA *pa2;
    krb5_salt salt2;
    krb5_enctype *ep;
    int i;
    
    if(salt == NULL) {
      /* default to standard salt */
      ret = krb5_get_pw_salt (context, client, &salt2);
      salt = &salt2;
    }
    if (!enctypes) {
      enctypes = context->etypes;
      netypes = 0;
      for (ep = enctypes; *ep != ETYPE_NULL; ep++)
          netypes++;
    }
    pa2 = realloc (md->val, (md->len + netypes) * sizeof(*md->val));
    if (pa2 == NULL) {
      krb5_set_error_string(context, "malloc: out of memory");
      return ENOMEM;
    }
    md->val = pa2;

    for (i = 0; i < netypes; ++i) {
      krb5_keyblock *key;

      ret = (*key_proc)(context, enctypes[i], *salt, keyseed, &key);
      if (ret)
          continue;
      ret = make_pa_enc_timestamp (context, &md->val[md->len],
                             enctypes[i], key);
      krb5_free_keyblock (context, key);
      if (ret)
          return ret;
      ++md->len;
    }
    if(salt == &salt2)
      krb5_free_salt(context, salt2);
    return 0;
}

static krb5_error_code
init_as_req (krb5_context context,
           krb5_kdc_flags opts,
           krb5_creds *creds,
           const krb5_addresses *addrs,
           const krb5_enctype *etypes,
           const krb5_preauthtype *ptypes,
           const krb5_preauthdata *preauth,
           krb5_key_proc key_proc,
           krb5_const_pointer keyseed,
           unsigned nonce,
           AS_REQ *a)
{
    krb5_error_code ret;
    krb5_salt salt;

    memset(a, 0, sizeof(*a));

    a->pvno = 5;
    a->msg_type = krb_as_req;
    a->req_body.kdc_options = opts.b;
    a->req_body.cname = malloc(sizeof(*a->req_body.cname));
    if (a->req_body.cname == NULL) {
      ret = ENOMEM;
      krb5_set_error_string(context, "malloc: out of memory");
      goto fail;
    }
    a->req_body.sname = malloc(sizeof(*a->req_body.sname));
    if (a->req_body.sname == NULL) {
      ret = ENOMEM;
      krb5_set_error_string(context, "malloc: out of memory");
      goto fail;
    }
    ret = krb5_principal2principalname (a->req_body.cname, creds->client);
    if (ret)
      goto fail;
    ret = krb5_principal2principalname (a->req_body.sname, creds->server);
    if (ret)
      goto fail;
    ret = copy_Realm(&creds->client->realm, &a->req_body.realm);
    if (ret)
      goto fail;

    if(creds->times.starttime) {
      a->req_body.from = malloc(sizeof(*a->req_body.from));
      if (a->req_body.from == NULL) {
          ret = ENOMEM;
          krb5_set_error_string(context, "malloc: out of memory");
          goto fail;
      }
      *a->req_body.from = creds->times.starttime;
    }
    if(creds->times.endtime){
      ALLOC(a->req_body.till, 1);
      *a->req_body.till = creds->times.endtime;
    }
    if(creds->times.renew_till){
      a->req_body.rtime = malloc(sizeof(*a->req_body.rtime));
      if (a->req_body.rtime == NULL) {
          ret = ENOMEM;
          krb5_set_error_string(context, "malloc: out of memory");
          goto fail;
      }
      *a->req_body.rtime = creds->times.renew_till;
    }
    a->req_body.nonce = nonce;
    ret = krb5_init_etype (context,
                     &a->req_body.etype.len,
                     &a->req_body.etype.val,
                     etypes);
    if (ret)
      goto fail;

    /*
     * This means no addresses
     */

    if (addrs && addrs->len == 0) {
      a->req_body.addresses = NULL;
    } else {
      a->req_body.addresses = malloc(sizeof(*a->req_body.addresses));
      if (a->req_body.addresses == NULL) {
          ret = ENOMEM;
          krb5_set_error_string(context, "malloc: out of memory");
          goto fail;
      }

      if (addrs)
          ret = krb5_copy_addresses(context, addrs, a->req_body.addresses);
      else {
          ret = krb5_get_all_client_addrs (context, a->req_body.addresses);
          if(ret == 0 && a->req_body.addresses->len == 0) {
            free(a->req_body.addresses);
            a->req_body.addresses = NULL;
          }
      }
      if (ret)
          return ret;
    }

    a->req_body.enc_authorization_data = NULL;
    a->req_body.additional_tickets = NULL;

    if(preauth != NULL) {
      int i;
      ALLOC(a->padata, 1);
      if(a->padata == NULL) {
          ret = ENOMEM;
          krb5_set_error_string(context, "malloc: out of memory");
          goto fail;
      }
      for(i = 0; i < preauth->len; i++) {
          if(preauth->val[i].type == KRB5_PADATA_ENC_TIMESTAMP){
            int j;
            PA_DATA *tmp = realloc(a->padata->val, 
                               (a->padata->len + 
                              preauth->val[i].info.len) * 
                               sizeof(*a->padata->val));
            if(tmp == NULL) {
                ret = ENOMEM;
                krb5_set_error_string(context, "malloc: out of memory");
                goto fail;
            }
            a->padata->val = tmp;
            for(j = 0; j < preauth->val[i].info.len; j++) {
                krb5_salt *sp = &salt;
                if(preauth->val[i].info.val[j].salttype)
                  salt.salttype = *preauth->val[i].info.val[j].salttype;
                else
                  salt.salttype = KRB5_PW_SALT;
                if(preauth->val[i].info.val[j].salt)
                  salt.saltvalue = *preauth->val[i].info.val[j].salt;
                else
                  if(salt.salttype == KRB5_PW_SALT)
                      sp = NULL;
                  else
                      krb5_data_zero(&salt.saltvalue);
                ret = add_padata(context, a->padata, creds->client, 
                             key_proc, keyseed, 
                             &preauth->val[i].info.val[j].etype, 1,
                             sp);
                if (ret == 0)
                  break;
            }
          }
      }
    } else 
    /* not sure this is the way to use `ptypes' */
    if (ptypes == NULL || *ptypes == KRB5_PADATA_NONE)
      a->padata = NULL;
    else if (*ptypes ==  KRB5_PADATA_ENC_TIMESTAMP) {
      ALLOC(a->padata, 1);
      if (a->padata == NULL) {
          ret = ENOMEM;
          krb5_set_error_string(context, "malloc: out of memory");
          goto fail;
      }
      a->padata->len = 0;
      a->padata->val = NULL;

      /* make a v5 salted pa-data */
      add_padata(context, a->padata, creds->client, 
               key_proc, keyseed, a->req_body.etype.val,
               a->req_body.etype.len, NULL);
      
      /* make a v4 salted pa-data */
      salt.salttype = KRB5_PW_SALT;
      krb5_data_zero(&salt.saltvalue);
      add_padata(context, a->padata, creds->client, 
               key_proc, keyseed, a->req_body.etype.val,
               a->req_body.etype.len, &salt);
    } else {
      krb5_set_error_string (context, "pre-auth type %d not supported",
                         *ptypes);
      ret = KRB5_PREAUTH_BAD_TYPE;
      goto fail;
    }
    return 0;
fail:
    free_AS_REQ(a);
    return ret;
}

static int
set_ptypes(krb5_context context,
         KRB_ERROR *error, 
         krb5_preauthtype **ptypes,
         krb5_preauthdata **preauth)
{
    static krb5_preauthdata preauth2;
    static krb5_preauthtype ptypes2[] = { KRB5_PADATA_ENC_TIMESTAMP, KRB5_PADATA_NONE };

    if(error->e_data) {
      METHOD_DATA md;
      int i;
      decode_METHOD_DATA(error->e_data->data, 
                     error->e_data->length, 
                     &md, 
                     NULL);
      for(i = 0; i < md.len; i++){
          switch(md.val[i].padata_type){
          case KRB5_PADATA_ENC_TIMESTAMP:
            *ptypes = ptypes2;
            break;
          case KRB5_PADATA_ETYPE_INFO:
            *preauth = &preauth2;
            ALLOC_SEQ(*preauth, 1);
            (*preauth)->val[0].type = KRB5_PADATA_ENC_TIMESTAMP;
            krb5_decode_ETYPE_INFO(context,
                               md.val[i].padata_value.data, 
                               md.val[i].padata_value.length,
                               &(*preauth)->val[0].info,
                               NULL);
            break;
          default:
            break;
          }
      }
      free_METHOD_DATA(&md);
    } else {
      *ptypes = ptypes2;
    }
    return(1);
}

krb5_error_code
krb5_get_in_cred(krb5_context context,
             krb5_flags options,
             const krb5_addresses *addrs,
             const krb5_enctype *etypes,
             const krb5_preauthtype *ptypes,
             const krb5_preauthdata *preauth,
             krb5_key_proc key_proc,
             krb5_const_pointer keyseed,
             krb5_decrypt_proc decrypt_proc,
             krb5_const_pointer decryptarg,
             krb5_creds *creds,
             krb5_kdc_rep *ret_as_reply)
{
    krb5_error_code ret;
    AS_REQ a;
    krb5_kdc_rep rep;
    krb5_data req, resp;
    size_t len;
    krb5_salt salt;
    krb5_keyblock *key;
    size_t size;
    krb5_kdc_flags opts;
    PA_DATA *pa;
    krb5_enctype etype;
    krb5_preauthdata *my_preauth = NULL;
    unsigned nonce;
    int done;

    opts.i = options;

    krb5_generate_random_block (&nonce, sizeof(nonce));
    nonce &= 0xffffffff;

    do {
      done = 1;
      ret = init_as_req (context,
                     opts,
                     creds,
                     addrs,
                     etypes,
                     ptypes,
                     preauth,
                     key_proc,
                     keyseed,
                     nonce,
                     &a);
      if (my_preauth) {
          free_ETYPE_INFO(&my_preauth->val[0].info);
          free (my_preauth->val);
      }
      if (ret)
          return ret;

      ASN1_MALLOC_ENCODE(AS_REQ, req.data, req.length, &a, &len, ret);
      free_AS_REQ(&a);
      if (ret)
          return ret;
      if(len != req.length)
          krb5_abortx(context, "internal error in ASN.1 encoder");

      ret = krb5_sendto_kdc (context, &req, &creds->client->realm, &resp);
      krb5_data_free(&req);
      if (ret)
          return ret;

      memset (&rep, 0, sizeof(rep));
      ret = decode_AS_REP(resp.data, resp.length, &rep.kdc_rep, &size);
      if(ret) {
          /* let's try to parse it as a KRB-ERROR */
          KRB_ERROR error;
          int ret2;

          ret2 = krb5_rd_error(context, &resp, &error);
          if(ret2 && resp.data && ((char*)resp.data)[0] == 4)
            ret = KRB5KRB_AP_ERR_V4_REPLY;
          krb5_data_free(&resp);
          if (ret2 == 0) {
            ret = krb5_error_from_rd_error(context, &error, creds);
            /* if no preauth was set and KDC requires it, give it
                   one more try */
            if (!ptypes && !preauth
                && ret == KRB5KDC_ERR_PREAUTH_REQUIRED
#if 0
                  || ret == KRB5KDC_ERR_BADOPTION
#endif
                && set_ptypes(context, &error, &ptypes, &my_preauth)) {
                done = 0;
                preauth = my_preauth;
                krb5_free_error_contents(context, &error);
                krb5_clear_error_string(context);
                continue;
            }
            if(ret_as_reply)
                ret_as_reply->error = error;
            else
                free_KRB_ERROR (&error);
            return ret;
          }
          return ret;
      }
      krb5_data_free(&resp);
    } while(!done);
    
    pa = NULL;
    etype = rep.kdc_rep.enc_part.etype;
    if(rep.kdc_rep.padata){
      int index = 0;
      pa = krb5_find_padata(rep.kdc_rep.padata->val, rep.kdc_rep.padata->len, 
                        KRB5_PADATA_PW_SALT, &index);
      if(pa == NULL) {
          index = 0;
          pa = krb5_find_padata(rep.kdc_rep.padata->val, 
                          rep.kdc_rep.padata->len, 
                          KRB5_PADATA_AFS3_SALT, &index);
      }
    }
    if(pa) {
      salt.salttype = pa->padata_type;
      salt.saltvalue = pa->padata_value;
      
      ret = (*key_proc)(context, etype, salt, keyseed, &key);
    } else {
      /* make a v5 salted pa-data */
      ret = krb5_get_pw_salt (context, creds->client, &salt);
      
      if (ret)
          goto out;
      ret = (*key_proc)(context, etype, salt, keyseed, &key);
      krb5_free_salt(context, salt);
    }
    if (ret)
      goto out;
      
    ret = _krb5_extract_ticket(context, 
                         &rep, 
                         creds, 
                         key, 
                         keyseed, 
                         KRB5_KU_AS_REP_ENC_PART,
                         NULL, 
                         nonce, 
                         FALSE, 
                         opts.b.request_anonymous,
                         decrypt_proc, 
                         decryptarg);
    memset (key->keyvalue.data, 0, key->keyvalue.length);
    krb5_free_keyblock_contents (context, key);
    free (key);

out:
    if (ret == 0 && ret_as_reply)
      *ret_as_reply = rep;
    else
      krb5_free_kdc_rep (context, &rep);
    return ret;
}

krb5_error_code
krb5_get_in_tkt(krb5_context context,
            krb5_flags options,
            const krb5_addresses *addrs,
            const krb5_enctype *etypes,
            const krb5_preauthtype *ptypes,
            krb5_key_proc key_proc,
            krb5_const_pointer keyseed,
            krb5_decrypt_proc decrypt_proc,
            krb5_const_pointer decryptarg,
            krb5_creds *creds,
            krb5_ccache ccache,
            krb5_kdc_rep *ret_as_reply)
{
    krb5_error_code ret;
    krb5_kdc_flags opts;
    opts.i = 0;
    opts.b = int2KDCOptions(options);
    
    ret = krb5_get_in_cred (context,
                      opts.i,
                      addrs,
                      etypes,
                      ptypes,
                      NULL,
                      key_proc,
                      keyseed,
                      decrypt_proc,
                      decryptarg,
                      creds,
                      ret_as_reply);
    if(ret) 
      return ret;
    if (ccache)
      ret = krb5_cc_store_cred (context, ccache, creds);
    return ret;
}

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