crypto/dist/heimdal/lib/45/mk_req.c

   1 /*
   2  * Copyright (c) 1997 - 2000, 2002 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /* implementation of krb_mk_req that uses 524 protocol */
  35
  36 #include "45_locl.h"
  37
  38 __RCSID("$Heimdal: mk_req.c 17445 2006-05-05 10:37:46Z lha $"
  39         "$NetBSD$");
  40
  41 static int lifetime = 255;
  42
  43 static void
  44 build_request(KTEXT req,
  45               const char *name, const char *inst, const char *realm,
  46               uint32_t checksum)
  47 {
  48     struct timeval tv;
  49     krb5_storage *sp;
  50     krb5_data data;
  51     sp = krb5_storage_emem();
  52     krb5_store_stringz(sp, name);
  53     krb5_store_stringz(sp, inst);
  54     krb5_store_stringz(sp, realm);
  55     krb5_store_int32(sp, checksum);
  56     gettimeofday(&tv, NULL);
  57     krb5_store_int8(sp, tv.tv_usec  / 5000);
  58     krb5_store_int32(sp, tv.tv_sec);
  59     krb5_storage_to_data(sp, &data);
  60     krb5_storage_free(sp);
  61     memcpy(req->dat, data.data, data.length);
  62     req->length = (data.length + 7) & ~7;
  63     krb5_data_free(&data);
  64 }
  65
  66 #ifdef KRB_MK_REQ_CONST
  67 int
  68 krb_mk_req(KTEXT authent,
  69            const char *service, const char *instance, const char *realm,
  70            int32_t checksum)
  71 #else
  72 int
  73 krb_mk_req(KTEXT authent,
  74            char *service, char *instance, char *realm,
  75            int32_t checksum)
  76
  77 #endif
  78 {
  79     CREDENTIALS cr;
  80     KTEXT_ST req;
  81     krb5_storage *sp;
  82     int code;
  83     /* XXX get user realm */
  84     const char *myrealm = realm;
  85     krb5_data a;
  86
  87     code = krb_get_cred(service, instance, realm, &cr);
  88     if(code || time(NULL) > krb_life_to_time(cr.issue_date, cr.lifetime)){
  89         code = get_ad_tkt((char *)service,
  90                           (char *)instance, (char *)realm, lifetime);
  91         if(code == KSUCCESS)
  92             code = krb_get_cred(service, instance, realm, &cr);
  93     }
  94
  95     if(code)
  96         return code;
  97
  98     sp = krb5_storage_emem();
  99
 100     krb5_store_int8(sp, KRB_PROT_VERSION);
 101     krb5_store_int8(sp, AUTH_MSG_APPL_REQUEST);
 102
 103     krb5_store_int8(sp, cr.kvno);
 104     krb5_store_stringz(sp, realm);
 105     krb5_store_int8(sp, cr.ticket_st.length);
 106
 107     build_request(&req, cr.pname, cr.pinst, myrealm, checksum);
 108     encrypt_ktext(&req, &cr.session, DES_ENCRYPT);
 109
 110     krb5_store_int8(sp, req.length);
 111
 112     krb5_storage_write(sp, cr.ticket_st.dat, cr.ticket_st.length);
 113     krb5_storage_write(sp, req.dat, req.length);
 114     krb5_storage_to_data(sp, &a);
 115     krb5_storage_free(sp);
 116     memcpy(authent->dat, a.data, a.length);
 117     authent->length = a.length;
 118     krb5_data_free(&a);
 119
 120     memset(&cr, 0, sizeof(cr));
 121     memset(&req, 0, sizeof(req));
 122
 123     return KSUCCESS;
 124 }
 125
 126 /*
 127  * krb_set_lifetime sets the default lifetime for additional tickets
 128  * obtained via krb_mk_req().
 129  *
 130  * It returns the previous value of the default lifetime.
 131  */
 132
 133 int
 134 krb_set_lifetime(int newval)
 135 {
 136     int olife = lifetime;
 137
 138     lifetime = newval;
 139     return(olife);
 140 }