/* db_berkeley.c--SASL berkeley db interface
 * Rob Siemborski
 * Tim Martin
 * $Id: allockey.c,v 1.2 2002/05/22 17:57:42 snsimon Exp $
 */
/* 
 * Copyright (c) 2001 Carnegie Mellon University.  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. The name "Carnegie Mellon University" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For permission or any other legal
 *    details, please contact  
 *      Office of Technology Transfer
 *      Carnegie Mellon University
 *      5000 Forbes Avenue
 *      Pittsburgh, PA  15213-3890
 *      (412) 268-4387, fax: (412) 268-7395
 *      tech-transfer@andrew.cmu.edu
 *
 * 4. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by Computing Services
 *     at Carnegie Mellon University (http://www.cmu.edu/computing/)."
 *
 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <config.h>

#include <sys/stat.h>
#include <stdlib.h>
#include "sasldb.h"

/*
 * Construct a key
 *
 */
int _sasldb_alloc_key(const sasl_utils_t *utils,
		      const char *auth_identity,
		      const char *realm,
		      const char *propName,
		      char **key,
		      size_t *key_len)
{
  size_t auth_id_len, realm_len, prop_len;

  if(!utils || !auth_identity || !realm || !propName || !key || !key_len)
	return SASL_BADPARAM;

  auth_id_len = strlen(auth_identity);
  realm_len = strlen(realm);
  prop_len = strlen(propName);

  *key_len = auth_id_len + realm_len + prop_len + 2;
  *key = utils->malloc(*key_len);
  if (! *key)
    return SASL_NOMEM;
  memcpy(*key, auth_identity, auth_id_len);
  (*key)[auth_id_len] = '\0';
  memcpy(*key + auth_id_len + 1, realm, realm_len);
  (*key)[auth_id_len + realm_len + 1] = '\0';
  memcpy(*key + auth_id_len + realm_len + 2, propName, prop_len);

  return SASL_OK;
}

/*
 * decode a key
 */
int _sasldb_parse_key(const char *key, const size_t key_len,
		      char *authid, const size_t max_authid,
		      char *realm, const size_t max_realm,
		      char *propName, const size_t max_propname) 
{
    unsigned i = 0;
    unsigned numnulls = 0;
    unsigned alen = 0, rlen = 0, pnlen = 0;

    if(!key || !key_len
       || (authid && !max_authid)
       || (realm && !max_realm)
       || (propName && !max_propname))
	return SASL_BADPARAM;

    for(i=0; i<key_len; i++) {
	if(key[i] == '\0') numnulls++;
    }

    if(numnulls != 2) return SASL_BADPARAM;

    alen = strlen(key);
    rlen = strlen(key + alen + 1);
    pnlen = key_len - alen - rlen - 2;
    

    if(authid) {
	if(alen >= max_authid)
	    return SASL_BUFOVER;
	strncpy(authid, key, max_authid);
    }

    if(realm) {
	if(rlen >= max_realm)
	    return SASL_BUFOVER;
	strncpy(realm, key + alen + 1, max_realm);
    }
    
    if(propName) {
	if(pnlen >= max_propname)
	    return SASL_BUFOVER;
	strncpy(propName, key + alen + rlen + 2, pnlen);

	/* Have to add the missing NULL */
	propName[pnlen] = '\0';
    }

    return SASL_OK;
}

/* These are more or less aliases to the correct functions */
int _sasldb_getsecret(const sasl_utils_t *utils,
		      sasl_conn_t *context,
		      const char *authid,
		      const char *realm,
		      sasl_secret_t ** secret) 
{
    char buf[8192];
    size_t len;
    sasl_secret_t *out;
    int ret;
    
    if(!secret) {
	utils->seterror(context, 0, "No secret pointer in _sasldb_getsecret");
	return SASL_BADPARAM;
    }

    ret = _sasldb_getdata(utils, context, authid, realm, SASL_AUX_PASSWORD,
			  buf, 8192, &len);
    
    if(ret != SASL_OK) {
	return ret;
    }
    
    out = utils->malloc(sizeof(sasl_secret_t) + len);
    if(!out) {
	utils->seterror(context, 0, "Out of Memory in _sasldb_getsecret");
	return SASL_NOMEM;
    }

    out->len = len;
    memcpy(out->data, buf, len);
    out->data[len]='\0';

    *secret = out;

    return SASL_OK;
}

int _sasldb_putsecret(const sasl_utils_t *utils,
		      sasl_conn_t *context,
		      const char *authid,
		      const char *realm,
		      const sasl_secret_t * secret) 
{
    const char *param = SASL_AUX_PASSWORD;
    param++; /* skip leading * */
    return _sasldb_putdata(utils, context, authid, realm, param,
			   (secret ? secret->data : NULL),
			   (secret ? secret->len : 0));
}