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get_cred.c

/*
 * Copyright (c) 1997 - 2004 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_cred.c,v 1.91.4.3 2004/01/09 00:47:17 lha Exp $");

/*
 * Take the `body' and encode it into `padata' using the credentials
 * in `creds'.
 */

static krb5_error_code
make_pa_tgs_req(krb5_context context, 
            krb5_auth_context ac,
            KDC_REQ_BODY *body,
            PA_DATA *padata,
            krb5_creds *creds,
            krb5_key_usage usage)
{
    u_char *buf;
    size_t buf_size;
    size_t len;
    krb5_data in_data;
    krb5_error_code ret;

    ASN1_MALLOC_ENCODE(KDC_REQ_BODY, buf, buf_size, body, &len, ret);
    if (ret)
      goto out;
    if(buf_size != len)
      krb5_abortx(context, "internal error in ASN.1 encoder");

    in_data.length = len;
    in_data.data   = buf;
    ret = krb5_mk_req_internal(context, &ac, 0, &in_data, creds,
                         &padata->padata_value,
                         KRB5_KU_TGS_REQ_AUTH_CKSUM,
                         usage
                         /* KRB5_KU_TGS_REQ_AUTH */);
out:
    free (buf);
    if(ret)
      return ret;
    padata->padata_type = KRB5_PADATA_TGS_REQ;
    return 0;
}

/*
 * Set the `enc-authorization-data' in `req_body' based on `authdata'
 */

static krb5_error_code
set_auth_data (krb5_context context,
             KDC_REQ_BODY *req_body,
             krb5_authdata *authdata,
             krb5_keyblock *key)
{
    if(authdata->len) {
      size_t len;
      unsigned char *buf;
      krb5_crypto crypto;
      krb5_error_code ret;

      ASN1_MALLOC_ENCODE(AuthorizationData, buf, len, authdata, &len, ret);
      if (ret)
          return ret;

      ALLOC(req_body->enc_authorization_data, 1);
      if (req_body->enc_authorization_data == NULL) {
          free (buf);
          krb5_set_error_string(context, "malloc: out of memory");
          return ENOMEM;
      }
      ret = krb5_crypto_init(context, key, 0, &crypto);
      if (ret) {
          free (buf);
          free (req_body->enc_authorization_data);
          return ret;
      }
      krb5_encrypt_EncryptedData(context, 
                           crypto,
                           KRB5_KU_TGS_REQ_AUTH_DAT_SUBKEY, 
                           /* KRB5_KU_TGS_REQ_AUTH_DAT_SESSION? */
                           buf,
                           len,
                           0,
                           req_body->enc_authorization_data);
      free (buf);
      krb5_crypto_destroy(context, crypto);
    } else {
      req_body->enc_authorization_data = NULL;
    }
    return 0;
}    

/*
 * Create a tgs-req in `t' with `addresses', `flags', `second_ticket'
 * (if not-NULL), `in_creds', `krbtgt', and returning the generated
 * subkey in `subkey'.
 */

static krb5_error_code
init_tgs_req (krb5_context context,
            krb5_ccache ccache,
            krb5_addresses *addresses,
            krb5_kdc_flags flags,
            Ticket *second_ticket,
            krb5_creds *in_creds,
            krb5_creds *krbtgt,
            unsigned nonce,
            krb5_keyblock **subkey,
            TGS_REQ *t,
            krb5_key_usage usage)
{
    krb5_error_code ret = 0;

    memset(t, 0, sizeof(*t));
    t->pvno = 5;
    t->msg_type = krb_tgs_req;
    if (in_creds->session.keytype) {
      ALLOC_SEQ(&t->req_body.etype, 1);
      if(t->req_body.etype.val == NULL) {
          ret = ENOMEM;
          krb5_set_error_string(context, "malloc: out of memory");
          goto fail;
      }
      t->req_body.etype.val[0] = in_creds->session.keytype;
    } else {
      ret = krb5_init_etype(context, 
                        &t->req_body.etype.len, 
                        &t->req_body.etype.val, 
                        NULL);
    }
    if (ret)
      goto fail;
    t->req_body.addresses = addresses;
    t->req_body.kdc_options = flags.b;
    ret = copy_Realm(&in_creds->server->realm, &t->req_body.realm);
    if (ret)
      goto fail;
    ALLOC(t->req_body.sname, 1);
    if (t->req_body.sname == NULL) {
      ret = ENOMEM;
      krb5_set_error_string(context, "malloc: out of memory");
      goto fail;
    }

    /* some versions of some code might require that the client be
       present in TGS-REQs, but this is clearly against the spec */

    ret = copy_PrincipalName(&in_creds->server->name, t->req_body.sname);
    if (ret)
      goto fail;

    /* req_body.till should be NULL if there is no endtime specified,
       but old MIT code (like DCE secd) doesn't like that */
    ALLOC(t->req_body.till, 1);
    if(t->req_body.till == NULL){
      ret = ENOMEM;
      krb5_set_error_string(context, "malloc: out of memory");
      goto fail;
    }
    *t->req_body.till = in_creds->times.endtime;
    
    t->req_body.nonce = nonce;
    if(second_ticket){
      ALLOC(t->req_body.additional_tickets, 1);
      if (t->req_body.additional_tickets == NULL) {
          ret = ENOMEM;
          krb5_set_error_string(context, "malloc: out of memory");
          goto fail;
      }
      ALLOC_SEQ(t->req_body.additional_tickets, 1);
      if (t->req_body.additional_tickets->val == NULL) {
          ret = ENOMEM;
          krb5_set_error_string(context, "malloc: out of memory");
          goto fail;
      }
      ret = copy_Ticket(second_ticket, t->req_body.additional_tickets->val); 
      if (ret)
          goto fail;
    }
    ALLOC(t->padata, 1);
    if (t->padata == NULL) {
      ret = ENOMEM;
      krb5_set_error_string(context, "malloc: out of memory");
      goto fail;
    }
    ALLOC_SEQ(t->padata, 1);
    if (t->padata->val == NULL) {
      ret = ENOMEM;
      krb5_set_error_string(context, "malloc: out of memory");
      goto fail;
    }

    {
      krb5_auth_context ac;
      krb5_keyblock *key = NULL;

      ret = krb5_auth_con_init(context, &ac);
      if(ret)
          goto fail;

      if (krb5_config_get_bool_default(context, NULL, FALSE,
                               "realms",
                               krbtgt->server->realm,
                               "tgs_require_subkey",
                               NULL))
      {
          ret = krb5_generate_subkey (context, &krbtgt->session, &key);
          if (ret) {
            krb5_auth_con_free (context, ac);
            goto fail;
          }

          ret = krb5_auth_con_setlocalsubkey(context, ac, key);
          if (ret) {
            if (key)
                krb5_free_keyblock (context, key);
            krb5_auth_con_free (context, ac);
            goto fail;
          }
      }

      ret = set_auth_data (context, &t->req_body, &in_creds->authdata, key);
      if (ret) {
          if (key)
            krb5_free_keyblock (context, key);
          krb5_auth_con_free (context, ac);
          goto fail;
      }

      ret = make_pa_tgs_req(context,
                        ac,
                        &t->req_body, 
                        t->padata->val,
                        krbtgt,
                        usage);
      if(ret) {
          if (key)
            krb5_free_keyblock (context, key);
          krb5_auth_con_free(context, ac);
          goto fail;
      }
      *subkey = key;
      
      krb5_auth_con_free(context, ac);
    }
fail:
    if (ret) {
      t->req_body.addresses = NULL;
      free_TGS_REQ (t);
    }
    return ret;
}

krb5_error_code
_krb5_get_krbtgt(krb5_context context,
             krb5_ccache  id,
             krb5_realm realm,
             krb5_creds **cred)
{
    krb5_error_code ret;
    krb5_creds tmp_cred;

    memset(&tmp_cred, 0, sizeof(tmp_cred));

    ret = krb5_cc_get_principal(context, id, &tmp_cred.client);
    if (ret)
      return ret;

    ret = krb5_make_principal(context, 
                        &tmp_cred.server,
                        realm,
                        KRB5_TGS_NAME,
                        realm,
                        NULL);
    if(ret) {
      krb5_free_principal(context, tmp_cred.client);
      return ret;
    }
    ret = krb5_get_credentials(context,
                         KRB5_GC_CACHED,
                         id,
                         &tmp_cred,
                         cred);
    krb5_free_principal(context, tmp_cred.client);
    krb5_free_principal(context, tmp_cred.server);
    if(ret)
      return ret;
    return 0;
}

/* DCE compatible decrypt proc */
static krb5_error_code
decrypt_tkt_with_subkey (krb5_context context,
                   krb5_keyblock *key,
                   krb5_key_usage usage,
                   krb5_const_pointer subkey,
                   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 && subkey){
      /* DCE compat -- try to decrypt with subkey */
      ret = krb5_crypto_init(context, (krb5_keyblock*)subkey, 0, &crypto);
      if (ret)
          return ret;
      ret = krb5_decrypt_EncryptedData (context,
                                crypto,
                                KRB5_KU_TGS_REP_ENC_PART_SUB_KEY,
                                &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);
    return ret;
}

static krb5_error_code
get_cred_kdc_usage(krb5_context context, 
               krb5_ccache id, 
               krb5_kdc_flags flags,
               krb5_addresses *addresses, 
               krb5_creds *in_creds, 
               krb5_creds *krbtgt,
               krb5_creds *out_creds,
               krb5_key_usage usage)
{
    TGS_REQ req;
    krb5_data enc;
    krb5_data resp;
    krb5_kdc_rep rep;
    KRB_ERROR error;
    krb5_error_code ret;
    unsigned nonce;
    krb5_keyblock *subkey = NULL;
    u_char *buf = NULL;
    size_t buf_size;
    size_t len;
    Ticket second_ticket;
    
    krb5_generate_random_block(&nonce, sizeof(nonce));
    nonce &= 0xffffffff;
    
    if(flags.b.enc_tkt_in_skey){
      ret = decode_Ticket(in_creds->second_ticket.data, 
                      in_creds->second_ticket.length, 
                      &second_ticket, &len);
      if(ret)
          return ret;
    }

    ret = init_tgs_req (context,
                  id,
                  addresses,
                  flags,
                  flags.b.enc_tkt_in_skey ? &second_ticket : NULL,
                  in_creds,
                  krbtgt,
                  nonce,
                  &subkey, 
                  &req,
                  usage);
    if(flags.b.enc_tkt_in_skey)
      free_Ticket(&second_ticket);
    if (ret)
      goto out;

    ASN1_MALLOC_ENCODE(TGS_REQ, buf, buf_size, &req, &enc.length, ret);
    if (ret) 
      goto out;
    if(enc.length != buf_size)
      krb5_abortx(context, "internal error in ASN.1 encoder");

    /* don't free addresses */
    req.req_body.addresses = NULL;
    free_TGS_REQ(&req);

    enc.data = buf + buf_size - enc.length;
    if (ret)
      goto out;
    
    /*
     * Send and receive
     */

    ret = krb5_sendto_kdc (context, &enc, 
                     &krbtgt->server->name.name_string.val[1], &resp);
    if(ret)
      goto out;

    memset(&rep, 0, sizeof(rep));
    if(decode_TGS_REP(resp.data, resp.length, &rep.kdc_rep, &len) == 0){
      ret = krb5_copy_principal(context, 
                          in_creds->client, 
                          &out_creds->client);
      if(ret)
          goto out;
      ret = krb5_copy_principal(context, 
                          in_creds->server, 
                          &out_creds->server);
      if(ret)
          goto out;
      /* this should go someplace else */
      out_creds->times.endtime = in_creds->times.endtime;

      ret = _krb5_extract_ticket(context,
                           &rep,
                           out_creds,
                           &krbtgt->session,
                           NULL,
                           KRB5_KU_TGS_REP_ENC_PART_SESSION,
                           &krbtgt->addresses,
                           nonce,
                           TRUE,
                           flags.b.request_anonymous,
                           decrypt_tkt_with_subkey,
                           subkey);
      krb5_free_kdc_rep(context, &rep);
      if (ret)
          goto out;
    } else if(krb5_rd_error(context, &resp, &error) == 0) {
      ret = krb5_error_from_rd_error(context, &error, in_creds);
      krb5_free_error_contents(context, &error);
    } else if(resp.data && ((char*)resp.data)[0] == 4) {
      ret = KRB5KRB_AP_ERR_V4_REPLY;
      krb5_clear_error_string(context);
    } else {
      ret = KRB5KRB_AP_ERR_MSG_TYPE;
      krb5_clear_error_string(context);
    }
    krb5_data_free(&resp);
 out:
    if(subkey){
      krb5_free_keyblock_contents(context, subkey);
      free(subkey);
    }
    if (buf)
      free (buf);
    return ret;
    
}

static krb5_error_code
get_cred_kdc(krb5_context context, 
           krb5_ccache id, 
           krb5_kdc_flags flags,
           krb5_addresses *addresses, 
           krb5_creds *in_creds, 
           krb5_creds *krbtgt,
           krb5_creds *out_creds)
{
    krb5_error_code ret;

    ret = get_cred_kdc_usage(context, id, flags, addresses, in_creds,
                       krbtgt, out_creds, KRB5_KU_TGS_REQ_AUTH);
    if (ret == KRB5KRB_AP_ERR_BAD_INTEGRITY) {
      krb5_clear_error_string (context);
      ret = get_cred_kdc_usage(context, id, flags, addresses, in_creds,
                         krbtgt, out_creds, KRB5_KU_AP_REQ_AUTH);
    }
    return ret;
}

/* same as above, just get local addresses first */

static krb5_error_code
get_cred_kdc_la(krb5_context context, krb5_ccache id, krb5_kdc_flags flags, 
            krb5_creds *in_creds, krb5_creds *krbtgt, 
            krb5_creds *out_creds)
{
    krb5_error_code ret;
    krb5_addresses addresses, *addrs = &addresses;
    
    krb5_get_all_client_addrs(context, &addresses);
    /* XXX this sucks. */
    if(addresses.len == 0)
      addrs = NULL;
    ret = get_cred_kdc(context, id, flags, addrs, 
                   in_creds, krbtgt, out_creds);
    krb5_free_addresses(context, &addresses);
    return ret;
}

krb5_error_code
krb5_get_kdc_cred(krb5_context context,
              krb5_ccache id,
              krb5_kdc_flags flags,
              krb5_addresses *addresses,
              Ticket  *second_ticket,
              krb5_creds *in_creds,
              krb5_creds **out_creds
              )
{
    krb5_error_code ret;
    krb5_creds *krbtgt;

    *out_creds = calloc(1, sizeof(**out_creds));
    if(*out_creds == NULL) {
      krb5_set_error_string(context, "malloc: out of memory");
      return ENOMEM;
    }
    ret = _krb5_get_krbtgt (context,
                      id,
                      in_creds->server->realm,
                      &krbtgt);
    if(ret) {
      free(*out_creds);
      return ret;
    }
    ret = get_cred_kdc(context, id, flags, addresses, 
                   in_creds, krbtgt, *out_creds);
    krb5_free_creds (context, krbtgt);
    if(ret)
      free(*out_creds);
    return ret;
}


static krb5_error_code
find_cred(krb5_context context,
        krb5_ccache id,
        krb5_principal server,
        krb5_creds **tgts,
        krb5_creds *out_creds)
{
    krb5_error_code ret;
    krb5_creds mcreds;
    mcreds.server = server;
    ret = krb5_cc_retrieve_cred(context, id, KRB5_TC_DONT_MATCH_REALM, 
                        &mcreds, out_creds);
    if(ret == 0)
      return 0;
    while(tgts && *tgts){
      if(krb5_compare_creds(context, KRB5_TC_DONT_MATCH_REALM, 
                        &mcreds, *tgts)){
          ret = krb5_copy_creds_contents(context, *tgts, out_creds);
          return ret;
      }
      tgts++;
    }
    krb5_clear_error_string(context);
    return KRB5_CC_NOTFOUND;
}

static krb5_error_code
add_cred(krb5_context context, krb5_creds ***tgts, krb5_creds *tkt)
{
    int i;
    krb5_error_code ret;
    krb5_creds **tmp = *tgts;

    for(i = 0; tmp && tmp[i]; i++); /* XXX */
    tmp = realloc(tmp, (i+2)*sizeof(*tmp));
    if(tmp == NULL) {
      krb5_set_error_string(context, "malloc: out of memory");
      return ENOMEM;
    }
    *tgts = tmp;
    ret = krb5_copy_creds(context, tkt, &tmp[i]);
    tmp[i+1] = NULL;
    return ret;
}

/*
get_cred(server)
      creds = cc_get_cred(server)
      if(creds) return creds
      tgt = cc_get_cred(krbtgt/server_realm@any_realm)
      if(tgt)
            return get_cred_tgt(server, tgt)
      if(client_realm == server_realm)
            return NULL
      tgt = get_cred(krbtgt/server_realm@client_realm)
      while(tgt_inst != server_realm)
            tgt = get_cred(krbtgt/server_realm@tgt_inst)
      return get_cred_tgt(server, tgt)
      */

static krb5_error_code
get_cred_from_kdc_flags(krb5_context context,
                  krb5_kdc_flags flags,
                  krb5_ccache ccache,
                  krb5_creds *in_creds,
                  krb5_creds **out_creds,
                  krb5_creds ***ret_tgts)
{
    krb5_error_code ret;
    krb5_creds *tgt, tmp_creds;
    krb5_const_realm client_realm, server_realm, try_realm;

    *out_creds = NULL;

    client_realm = *krb5_princ_realm(context, in_creds->client);
    server_realm = *krb5_princ_realm(context, in_creds->server);
    memset(&tmp_creds, 0, sizeof(tmp_creds));
    ret = krb5_copy_principal(context, in_creds->client, &tmp_creds.client);
    if(ret)
      return ret;

    try_realm = krb5_config_get_string(context, NULL, "capaths", 
                               client_realm, server_realm, NULL);
    
#if 1
    /* XXX remove in future release */
    if(try_realm == NULL)
      try_realm = krb5_config_get_string(context, NULL, "libdefaults", 
                                 "capath", server_realm, NULL);
#endif

    if (try_realm == NULL)
      try_realm = client_realm;

    ret = krb5_make_principal(context,
                        &tmp_creds.server,
                        try_realm,
                        KRB5_TGS_NAME,
                        server_realm, 
                        NULL);
    if(ret){
      krb5_free_principal(context, tmp_creds.client);
      return ret;
    }
    {
      krb5_creds tgts;
      /* XXX try krb5_cc_retrieve_cred first? */
      ret = find_cred(context, ccache, tmp_creds.server, 
                  *ret_tgts, &tgts);
      if(ret == 0){
          *out_creds = calloc(1, sizeof(**out_creds));
          if(*out_creds == NULL) {
            krb5_set_error_string(context, "malloc: out of memory");
            ret = ENOMEM;
          } else {
            krb5_boolean noaddr;

            krb5_appdefault_boolean(context, NULL, tgts.server->realm,
                              "no-addresses", FALSE, &noaddr);

            if (noaddr)
                ret = get_cred_kdc(context, ccache, flags, NULL,
                               in_creds, &tgts, *out_creds);
            else
                ret = get_cred_kdc_la(context, ccache, flags, 
                                in_creds, &tgts, *out_creds);
            if (ret) {
                free (*out_creds);
                *out_creds = NULL;
            }
          }
          krb5_free_creds_contents(context, &tgts);
          krb5_free_principal(context, tmp_creds.server);
          krb5_free_principal(context, tmp_creds.client);
          return ret;
      }
    }
    if(krb5_realm_compare(context, in_creds->client, in_creds->server)) {
      krb5_clear_error_string (context);
      return KRB5_CC_NOTFOUND;
    }
    /* XXX this can loop forever */
    while(1){
      general_string tgt_inst;

      ret = get_cred_from_kdc_flags(context, flags, ccache, &tmp_creds, 
                              &tgt, ret_tgts);
      if(ret) {
          krb5_free_principal(context, tmp_creds.server);
          krb5_free_principal(context, tmp_creds.client);
          return ret;
      }
      ret = add_cred(context, ret_tgts, tgt);
      if(ret) {
          krb5_free_principal(context, tmp_creds.server);
          krb5_free_principal(context, tmp_creds.client);
          return ret;
      }
      tgt_inst = tgt->server->name.name_string.val[1];
      if(strcmp(tgt_inst, server_realm) == 0)
          break;
      krb5_free_principal(context, tmp_creds.server);
      ret = krb5_make_principal(context, &tmp_creds.server, 
                          tgt_inst, KRB5_TGS_NAME, server_realm, NULL);
      if(ret) {
          krb5_free_principal(context, tmp_creds.server);
          krb5_free_principal(context, tmp_creds.client);
          return ret;
      }
      ret = krb5_free_creds(context, tgt);
      if(ret) {
          krb5_free_principal(context, tmp_creds.server);
          krb5_free_principal(context, tmp_creds.client);
          return ret;
      }
    }
      
    krb5_free_principal(context, tmp_creds.server);
    krb5_free_principal(context, tmp_creds.client);
    *out_creds = calloc(1, sizeof(**out_creds));
    if(*out_creds == NULL) {
      krb5_set_error_string(context, "malloc: out of memory");
      ret = ENOMEM;
    } else {
      krb5_boolean noaddr;

      krb5_appdefault_boolean(context, NULL, tgt->server->realm,
                        "no-addresses", FALSE, &noaddr);
      if (noaddr)
          ret = get_cred_kdc (context, ccache, flags, NULL,
                        in_creds, tgt, *out_creds);
      else
          ret = get_cred_kdc_la(context, ccache, flags, 
                          in_creds, tgt, *out_creds);
      if (ret) {
          free (*out_creds);
          *out_creds = NULL;
      }
    }
    krb5_free_creds(context, tgt);
    return ret;
}

krb5_error_code
krb5_get_cred_from_kdc_opt(krb5_context context,
                     krb5_ccache ccache,
                     krb5_creds *in_creds,
                     krb5_creds **out_creds,
                     krb5_creds ***ret_tgts,
                     krb5_flags flags)
{
    krb5_kdc_flags f;
    f.i = flags;
    return get_cred_from_kdc_flags(context, f, ccache, 
                           in_creds, out_creds, ret_tgts);
}

krb5_error_code
krb5_get_cred_from_kdc(krb5_context context,
                   krb5_ccache ccache,
                   krb5_creds *in_creds,
                   krb5_creds **out_creds,
                   krb5_creds ***ret_tgts)
{
    return krb5_get_cred_from_kdc_opt(context, ccache, 
                              in_creds, out_creds, ret_tgts, 0);
}
     

krb5_error_code
krb5_get_credentials_with_flags(krb5_context context,
                        krb5_flags options,
                        krb5_kdc_flags flags,
                        krb5_ccache ccache,
                        krb5_creds *in_creds,
                        krb5_creds **out_creds)
{
    krb5_error_code ret;
    krb5_creds **tgts;
    krb5_creds *res_creds;
    int i;
    
    *out_creds = NULL;
    res_creds = calloc(1, sizeof(*res_creds));
    if (res_creds == NULL) {
      krb5_set_error_string(context, "malloc: out of memory");
      return ENOMEM;
    }

    ret = krb5_cc_retrieve_cred(context,
                        ccache,
                        in_creds->session.keytype ?
                        KRB5_TC_MATCH_KEYTYPE : 0,
                        in_creds, res_creds);
    if(ret == 0) {
      *out_creds = res_creds;
      return 0;
    }
    free(res_creds);
    if(ret != KRB5_CC_END)
      return ret;
    if(options & KRB5_GC_CACHED) {
      krb5_clear_error_string (context);
      return KRB5_CC_NOTFOUND;
    }
    if(options & KRB5_GC_USER_USER)
      flags.b.enc_tkt_in_skey = 1;
    tgts = NULL;
    ret = get_cred_from_kdc_flags(context, flags, ccache, 
                          in_creds, out_creds, &tgts);
    for(i = 0; tgts && tgts[i]; i++) {
      krb5_cc_store_cred(context, ccache, tgts[i]);
      krb5_free_creds(context, tgts[i]);
    }
    free(tgts);
    if(ret == 0 && flags.b.enc_tkt_in_skey == 0)
      krb5_cc_store_cred(context, ccache, *out_creds);
    return ret;
}

krb5_error_code
krb5_get_credentials(krb5_context context,
                 krb5_flags options,
                 krb5_ccache ccache,
                 krb5_creds *in_creds,
                 krb5_creds **out_creds)
{
    krb5_kdc_flags flags;
    flags.i = 0;
    return krb5_get_credentials_with_flags(context, options, flags,
                                 ccache, in_creds, out_creds);
}

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