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/*
* lib/krb5/krb/get_creds.c
*
* Copyright 1990 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*
* krb5_get_credentials()
*/
/*
Attempts to use the credentials cache or TGS exchange to get an additional
ticket for the
client identified by in_creds->client, the server identified by
in_creds->server, with options options, expiration date specified in
in_creds->times.endtime (0 means as long as possible), session key type
specified in in_creds->keyblock.enctype (if non-zero)
Any returned ticket and intermediate ticket-granting tickets are
stored in ccache.
returns errors from encryption routines, system errors
*/
#include "k5-int.h"
static krb5_error_code
krb5_get_credentials_core(context, options, ccache, in_creds, out_creds,
mcreds, fields)
krb5_context context;
const krb5_flags options;
krb5_ccache ccache;
krb5_creds *in_creds;
krb5_creds **out_creds;
krb5_creds *mcreds;
krb5_flags *fields;
{
krb5_error_code retval;
if (!in_creds || !in_creds->server || !in_creds->client)
return EINVAL;
memset((char *)mcreds, 0, sizeof(krb5_creds));
mcreds->magic = KV5M_CREDS;
mcreds->times.endtime = in_creds->times.endtime;
#ifdef HAVE_C_STRUCTURE_ASSIGNMENT
mcreds->keyblock = in_creds->keyblock;
#else
memcpy(&mcreds->keyblock, &in_creds->keyblock, sizeof(krb5_keyblock));
#endif
mcreds->authdata = in_creds->authdata;
mcreds->server = in_creds->server;
mcreds->client = in_creds->client;
*fields = KRB5_TC_MATCH_TIMES /*XXX |KRB5_TC_MATCH_SKEY_TYPE */
| KRB5_TC_MATCH_AUTHDATA ;
if (mcreds->keyblock.enctype)
*fields |= KRB5_TC_MATCH_KTYPE;
if (options & KRB5_GC_USER_USER) {
/* also match on identical 2nd tkt and tkt encrypted in a
session key */
*fields |= KRB5_TC_MATCH_2ND_TKT|KRB5_TC_MATCH_IS_SKEY;
mcreds->is_skey = TRUE;
mcreds->second_ticket = in_creds->second_ticket;
if (!in_creds->second_ticket.length)
return KRB5_NO_2ND_TKT;
}
return 0;
}
KRB5_DLLIMP krb5_error_code KRB5_CALLCONV
krb5_get_credentials(context, options, ccache, in_creds, out_creds)
krb5_context context;
const krb5_flags options;
krb5_ccache ccache;
krb5_creds FAR *in_creds;
krb5_creds FAR * FAR *out_creds;
{
krb5_error_code retval;
krb5_creds mcreds;
krb5_creds *ncreds;
krb5_creds **tgts;
krb5_flags fields;
retval = krb5_get_credentials_core(context, options, ccache,
in_creds, out_creds,
&mcreds, &fields);
if (retval) return retval;
if ((ncreds = (krb5_creds *)malloc(sizeof(krb5_creds))) == NULL)
return ENOMEM;
memset((char *)ncreds, 0, sizeof(krb5_creds));
ncreds->magic = KV5M_CREDS;
/* The caller is now responsible for cleaning up in_creds */
if ((retval = krb5_cc_retrieve_cred(context, ccache, fields, &mcreds,
ncreds))) {
krb5_xfree(ncreds);
ncreds = in_creds;
} else {
*out_creds = ncreds;
}
if (retval != KRB5_CC_NOTFOUND || options & KRB5_GC_CACHED)
return retval;
retval = krb5_get_cred_from_kdc(context, ccache, ncreds, out_creds, &tgts);
if (tgts) {
register int i = 0;
krb5_error_code rv2;
while (tgts[i]) {
if ((rv2 = krb5_cc_store_cred(context, ccache, tgts[i]))) {
retval = rv2;
break;
}
i++;
}
krb5_free_tgt_creds(context, tgts);
}
if (!retval)
retval = krb5_cc_store_cred(context, ccache, *out_creds);
return retval;
}
#define INT_GC_VALIDATE 1
#define INT_GC_RENEW 2
static krb5_error_code
krb5_get_credentials_val_renew_core(context, options, ccache,
in_creds, out_creds, which)
krb5_context context;
const krb5_flags options;
krb5_ccache ccache;
krb5_creds *in_creds;
krb5_creds **out_creds;
int which;
{
krb5_error_code retval;
krb5_creds mcreds;
krb5_principal tmp;
krb5_creds **tgts = 0;
krb5_flags fields;
retval = krb5_get_credentials_core(context, options, ccache,
in_creds, out_creds,
&mcreds, &fields);
if (retval) return retval;
switch(which) {
case INT_GC_VALIDATE:
retval = krb5_get_cred_from_kdc_validate(context, ccache,
in_creds, out_creds, &tgts);
break;
case INT_GC_RENEW:
retval = krb5_get_cred_from_kdc_renew(context, ccache,
in_creds, out_creds, &tgts);
break;
default:
/* Should never happen */
retval = 255;
break;
}
if (retval) return retval;
if (tgts) krb5_free_tgt_creds(context, tgts);
retval = krb5_cc_get_principal(context, ccache, &tmp);
if (retval) return retval;
retval = krb5_cc_initialize(context, ccache, tmp);
if (retval) return retval;
retval = krb5_cc_store_cred(context, ccache, *out_creds);
return retval;
}
krb5_error_code
krb5_get_credentials_validate(context, options, ccache, in_creds, out_creds)
krb5_context context;
const krb5_flags options;
krb5_ccache ccache;
krb5_creds *in_creds;
krb5_creds **out_creds;
{
return(krb5_get_credentials_val_renew_core(context, options, ccache,
in_creds, out_creds,
INT_GC_VALIDATE));
}
krb5_error_code
krb5_get_credentials_renew(context, options, ccache, in_creds, out_creds)
krb5_context context;
const krb5_flags options;
krb5_ccache ccache;
krb5_creds *in_creds;
krb5_creds **out_creds;
{
return(krb5_get_credentials_val_renew_core(context, options, ccache,
in_creds, out_creds,
INT_GC_RENEW));
}
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