lib/gssapi/krb5: implement GSS_C_CHANNEL_BOUND_FLAG for gss_init_sec_context()

[heimdal.git] / lib / hdb / keys.c

/*
 * Copyright (c) 1997 - 2011 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"
#include "hdb_locl.h"

#include <pkinit_asn1.h>
#include <base64.h>

/*
 * free all the memory used by (len, keys)
 */

void
hdb_free_keys(krb5_context context, int len, Key *keys)
{
    size_t i;

    for (i = 0; i < len; i++) {
        free(keys[i].mkvno);
        keys[i].mkvno = NULL;
        if (keys[i].salt != NULL) {
            free_Salt(keys[i].salt);
            free(keys[i].salt);
            keys[i].salt = NULL;
        }
        krb5_free_keyblock_contents(context, &keys[i].key);
    }
    free (keys);
}

/*
 * for each entry in `default_keys' try to parse it as a sequence
 * of etype:salttype:salt, syntax of this if something like:
 * [(des|des3|etype):](pw-salt|afs3)[:string], if etype is omitted it
 *      means all etypes, and if string is omitted is means the default
 * string (for that principal). Additional special values:
 *      v5 == pw-salt, and
 *      v4 == des:pw-salt:
 *      afs or afs3 == des:afs3-salt
 */

static const krb5_enctype des_etypes[] = {
    KRB5_ENCTYPE_DES_CBC_MD5,
    KRB5_ENCTYPE_DES_CBC_MD4,
    KRB5_ENCTYPE_DES_CBC_CRC
};

static const krb5_enctype all_etypes[] = {
    KRB5_ENCTYPE_AES256_CTS_HMAC_SHA1_96,
    KRB5_ENCTYPE_DES3_CBC_SHA1,
    KRB5_ENCTYPE_ARCFOUR_HMAC_MD5
};

static krb5_error_code
parse_key_set(krb5_context context, const char *key,
              krb5_enctype **ret_enctypes, size_t *ret_num_enctypes,
              krb5_salt *salt, krb5_principal principal)
{
    const char *p;
    char buf[3][256];
    int num_buf = 0;
    int i, num_enctypes = 0;
    krb5_enctype e;
    const krb5_enctype *enctypes = NULL;
    krb5_error_code ret;

    p = key;

    *ret_enctypes = NULL;
    *ret_num_enctypes = 0;

    /* split p in a list of :-separated strings */
    for(num_buf = 0; num_buf < 3; num_buf++)
        if(strsep_copy(&p, ":", buf[num_buf], sizeof(buf[num_buf])) == -1)
            break;

    salt->saltvalue.data = NULL;
    salt->saltvalue.length = 0;

    for(i = 0; i < num_buf; i++) {
        if(enctypes == NULL && num_buf > 1) {
            /* this might be a etype specifier */
            /* XXX there should be a string_to_etypes handling
               special cases like `des' and `all' */
            if(strcmp(buf[i], "des") == 0) {
                enctypes = des_etypes;
                num_enctypes = sizeof(des_etypes)/sizeof(des_etypes[0]);
            } else if(strcmp(buf[i], "des3") == 0) {
                e = KRB5_ENCTYPE_DES3_CBC_SHA1;
                enctypes = &e;
                num_enctypes = 1;
            } else {
                ret = krb5_string_to_enctype(context, buf[i], &e);
                if (ret == 0) {
                    enctypes = &e;
                    num_enctypes = 1;
                } else
                    return ret;
            }
            continue;
        }
        if(salt->salttype == 0) {
            /* interpret string as a salt specifier, if no etype
               is set, this sets default values */
            /* XXX should perhaps use string_to_salttype, but that
               interface sucks */
            if(strcmp(buf[i], "pw-salt") == 0) {
                if(enctypes == NULL) {
                    enctypes = all_etypes;
                    num_enctypes = sizeof(all_etypes)/sizeof(all_etypes[0]);
                }
                salt->salttype = KRB5_PW_SALT;
            } else if(strcmp(buf[i], "afs3-salt") == 0) {
                if(enctypes == NULL) {
                    enctypes = des_etypes;
                    num_enctypes = sizeof(des_etypes)/sizeof(des_etypes[0]);
                }
                salt->salttype = KRB5_AFS3_SALT;
            }
            continue;
        }

        if (salt->saltvalue.data != NULL)
            free(salt->saltvalue.data);
        /* if there is a final string, use it as the string to
           salt with, this is mostly useful with null salt for
           v4 compat, and a cell name for afs compat */
        salt->saltvalue.data = strdup(buf[i]);
        if (salt->saltvalue.data == NULL)
            return krb5_enomem(context);
        salt->saltvalue.length = strlen(buf[i]);
    }

    if(enctypes == NULL || salt->salttype == 0) {
        krb5_free_salt(context, *salt);
        krb5_set_error_message(context, EINVAL, "bad value for default_keys `%s'", key);
        return EINVAL;
    }

    /* if no salt was specified make up default salt */
    if(salt->saltvalue.data == NULL) {
        if(salt->salttype == KRB5_PW_SALT) {
            ret = krb5_get_pw_salt(context, principal, salt);
            if (ret)
                return ret;
        } else if(salt->salttype == KRB5_AFS3_SALT) {
            krb5_const_realm realm = krb5_principal_get_realm(context, principal);
            salt->saltvalue.data = strdup(realm);
            if(salt->saltvalue.data == NULL) {
                krb5_set_error_message(context, ENOMEM,
                                       "out of memory while "
                                       "parsing salt specifiers");
                return ENOMEM;
            }
            strlwr(salt->saltvalue.data);
            salt->saltvalue.length = strlen(realm);
        }
    }

    *ret_enctypes = malloc(sizeof(enctypes[0]) * num_enctypes);
    if (*ret_enctypes == NULL) {
        krb5_free_salt(context, *salt);
        krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
        return ENOMEM;
    }
    memcpy(*ret_enctypes, enctypes, sizeof(enctypes[0]) * num_enctypes);
    *ret_num_enctypes = num_enctypes;

    return 0;
}

/**
 * This function prunes an HDB entry's historic keys by kvno.
 *
 * @param context   Context
 * @param entry     HDB entry
 * @param kvno      Keyset kvno to prune, or zero to prune all too-old keys
 */
krb5_error_code
hdb_prune_keys_kvno(krb5_context context, hdb_entry *entry, int kvno)
{
    HDB_extension *ext;
    HDB_Ext_KeySet *keys;
    hdb_keyset *elem;
    time_t keep_time = 0;
    size_t nelem;
    size_t i;

    /*
     * XXX Pruning old keys for namespace principals may not be desirable, but!
     * as long as the `set_time's of the base keys for a namespace principal
     * match the `epoch's of the corresponding KeyRotation periods, it will be
     * perfectly acceptable to prune old [base] keys for namespace principals
     * just as for any other principal.  Therefore, we may not need to make any
     * changes here w.r.t. namespace principals.
     */

    ext = hdb_find_extension(entry, choice_HDB_extension_data_hist_keys);
    if (ext == NULL)
        return 0;
    keys = &ext->data.u.hist_keys;
    nelem = keys->len;

    /*
     * Optionally drop key history for keys older than now - max_life, which is
     * all the keys no longer needed to decrypt extant tickets.
     */
    if (kvno == 0 && entry->max_life != NULL && nelem > 0) {
        time_t ceiling = time(NULL) - *entry->max_life;

        /*
         * Compute most recent key timestamp that predates the current time
         * by at least the entry's maximum ticket lifetime.
         */
        for (i = 0; i < nelem; ++i) {
            elem = &keys->val[i];
            if (elem->set_time && *elem->set_time < ceiling
                && (keep_time == 0 || *elem->set_time > keep_time))
                keep_time = *elem->set_time;
        }
    }

    if (kvno == 0 && keep_time == 0)
        return 0;

    for (i = 0; i < nelem; /* see below */) {
        elem = &keys->val[i];
        if ((kvno && kvno == elem->kvno) ||
            (keep_time && elem->set_time && *elem->set_time < keep_time)) {
            remove_HDB_Ext_KeySet(keys, i);
            /*
             * Removing the i'th element shifts the tail down, continue
             * at same index with reduced upper bound.
             */
            --nelem;
            continue;
        }
        ++i;
    }

    return 0;
}

/**
 * This function prunes an HDB entry's keys that are too old to have been used
 * to mint still valid tickets (based on the entry's maximum ticket lifetime).
 * 
 * @param context   Context
 * @param entry     HDB entry
 */
krb5_error_code
hdb_prune_keys(krb5_context context, hdb_entry *entry)
{
    if (!krb5_config_get_bool_default(context, NULL, FALSE,
                                      "kadmin", "prune-key-history", NULL))
        return 0;
    return hdb_prune_keys_kvno(context, entry, 0);
}

/**
 * This function adds a keyset to an HDB entry's key history.
 *
 * @param context   Context
 * @param entry     HDB entry
 * @param kvno      Key version number of the key to add to the history
 * @param key       The Key to add
 */
krb5_error_code
hdb_add_history_keyset(krb5_context context,
                       hdb_entry *entry,
                       const hdb_keyset *ks)
{
    size_t i;
    HDB_Ext_KeySet *hist_keys;
    HDB_extension ext;
    HDB_extension *extp;
    krb5_error_code ret = 0;

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

    extp = hdb_find_extension(entry, choice_HDB_extension_data_hist_keys);
    if (extp == NULL) {
        ext.mandatory = FALSE;
        ext.data.element = choice_HDB_extension_data_hist_keys;
        ext.data.u.hist_keys.len = 0;
        ext.data.u.hist_keys.val = 0;
        extp = &ext;
    }
    hist_keys = &extp->data.u.hist_keys;

    for (i = 0; i < hist_keys->len; i++) {
        if (hist_keys->val[i].kvno == ks->kvno) {
            /* Replace existing */
            free_HDB_keyset(&hist_keys->val[i]);
            ret = copy_HDB_keyset(ks, &hist_keys->val[i]);
            break;
        }
    }
    if (i >= hist_keys->len)
        ret = add_HDB_Ext_KeySet(hist_keys, ks); /* Append new */
    if (ret == 0 && extp == &ext)
        ret = hdb_replace_extension(context, entry, &ext);
    free_HDB_extension(&ext);
    return ret;
}

/**
 * This function adds an HDB entry's current keyset to the entry's key
 * history.  The current keyset is left alone; the caller is responsible
 * for freeing it.
 *
 * @param context   Context
 * @param entry     HDB entry
 *
 * @return Zero on success, or an error code otherwise.
 */
krb5_error_code
hdb_add_current_keys_to_history(krb5_context context, hdb_entry *entry)
{
    krb5_error_code ret;
    hdb_keyset ks;
    time_t newtime;

    if (entry->keys.len == 0)
        return 0; /* nothing to do */

    ret = hdb_entry_get_pw_change_time(entry, &newtime);
    if (ret)
        return ret;

    ks.keys = entry->keys;
    ks.kvno = entry->kvno;
    ks.set_time = &newtime;

    ret = hdb_add_history_keyset(context, entry, &ks);
    if (ret == 0)
        ret = hdb_prune_keys(context, entry);
    return ret;
}

/**
 * This function adds a key to an HDB entry's key history.
 *
 * @param context   Context
 * @param entry     HDB entry
 * @param kvno      Key version number of the key to add to the history
 * @param key       The Key to add
 *
 * @return Zero on success, or an error code otherwise.
 */
krb5_error_code
hdb_add_history_key(krb5_context context, hdb_entry *entry, krb5_kvno kvno, Key *key)
{
    size_t i;
    hdb_keyset keyset;
    HDB_Ext_KeySet *hist_keys;
    HDB_extension ext;
    HDB_extension *extp;
    krb5_error_code ret;

    memset(&keyset, 0, sizeof (keyset));
    memset(&ext, 0, sizeof (ext));

    extp = hdb_find_extension(entry, choice_HDB_extension_data_hist_keys);
    if (extp == NULL) {
        ext.data.element = choice_HDB_extension_data_hist_keys;
        extp = &ext;
    }

    extp->mandatory = FALSE;
    hist_keys = &extp->data.u.hist_keys;

    for (i = 0; i < hist_keys->len; i++) {
        if (hist_keys->val[i].kvno == kvno) {
            ret = add_Keys(&hist_keys->val[i].keys, key);
            goto out;
        }
    }

    keyset.kvno = kvno;
    ret = add_Keys(&keyset.keys, key);
    if (ret)
        goto out;
    ret = add_HDB_Ext_KeySet(hist_keys, &keyset);
    if (ret)
        goto out;
    if (extp == &ext) {
        ret = hdb_replace_extension(context, entry, &ext);
        if (ret)
            goto out;
    }

out:
    free_HDB_keyset(&keyset);
    free_HDB_extension(&ext);
    return ret;
}

/**
 * This function changes an hdb_entry's kvno, swapping the current key
 * set with a historical keyset.  If no historical keys are found then
 * an error is returned (the caller can still set entry->kvno directly).
 *
 * @param context       krb5_context
 * @param new_kvno      New kvno for the entry
 * @param entry         hdb_entry to modify
 */
krb5_error_code
hdb_change_kvno(krb5_context context, krb5_kvno new_kvno, hdb_entry *entry)
{
    HDB_extension ext;
    HDB_extension *extp;
    hdb_keyset keyset;
    HDB_Ext_KeySet *hist_keys;
    size_t i;
    int found = 0;
    krb5_error_code ret;

    if (entry->kvno == new_kvno)
        return 0;

    extp = hdb_find_extension(entry, choice_HDB_extension_data_hist_keys);
    if (extp == NULL) {
        memset(&ext, 0, sizeof (ext));
        ext.data.element = choice_HDB_extension_data_hist_keys;
        extp = &ext;
    }

    memset(&keyset, 0, sizeof (keyset));
    hist_keys = &extp->data.u.hist_keys;
    for (i = 0; i < hist_keys->len; i++) {
        if (hist_keys->val[i].kvno == new_kvno) {
            found = 1;
            ret = copy_HDB_keyset(&hist_keys->val[i], &keyset);
            if (ret)
                goto out;
            ret = remove_HDB_Ext_KeySet(hist_keys, i);
            if (ret)
                goto out;
            break;
        }
    }

    if (!found)
        return HDB_ERR_KVNO_NOT_FOUND;

    ret = hdb_add_current_keys_to_history(context, entry);
    if (ret)
        goto out;

    /* Note: we do nothing with keyset.set_time */
    entry->kvno = new_kvno;
    entry->keys = keyset.keys; /* shortcut */
    memset(&keyset.keys, 0, sizeof (keyset.keys));

out:
    free_HDB_keyset(&keyset);
    return ret;
}


static krb5_error_code
add_enctype_to_key_set(Key **key_set, size_t *nkeyset,
                       krb5_enctype enctype, krb5_salt *salt)
{
    krb5_error_code ret;
    Key key, *tmp;

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

    tmp = realloc(*key_set, (*nkeyset + 1) * sizeof((*key_set)[0]));
    if (tmp == NULL)
        return ENOMEM;

    *key_set = tmp;

    key.key.keytype = enctype;
    key.key.keyvalue.length = 0;
    key.key.keyvalue.data = NULL;

    if (salt) {
        key.salt = calloc(1, sizeof(*key.salt));
        if (key.salt == NULL) {
            free_Key(&key);
            return ENOMEM;
        }

        key.salt->type = salt->salttype;
        krb5_data_zero (&key.salt->salt);

        ret = krb5_data_copy(&key.salt->salt,
                             salt->saltvalue.data,
                             salt->saltvalue.length);
        if (ret) {
            free_Key(&key);
            return ret;
        }
    } else
        key.salt = NULL;

    (*key_set)[*nkeyset] = key;

    *nkeyset += 1;

    return 0;
}


static
krb5_error_code
ks_tuple2str(krb5_context context, int n_ks_tuple,
             krb5_key_salt_tuple *ks_tuple, char ***ks_tuple_strs)
{
        size_t i;
        char **ksnames;
        krb5_error_code rc = KRB5_PROG_ETYPE_NOSUPP;

        *ks_tuple_strs = NULL;
        if (n_ks_tuple < 1)
                return 0;

        if ((ksnames = calloc(n_ks_tuple + 1, sizeof (*ksnames))) == NULL)
                return (errno);

        for (i = 0; i < n_ks_tuple; i++) {
            char *ename, *sname;

            if (krb5_enctype_to_string(context, ks_tuple[i].ks_enctype, &ename))
                goto out;
            if (krb5_salttype_to_string(context, ks_tuple[i].ks_enctype,
                                        ks_tuple[i].ks_salttype, &sname)) {
                free(ename);
                goto out;
            }

            if (asprintf(&ksnames[i], "%s:%s", ename, sname) == -1) {
                    rc = errno;
                    free(ename);
                    free(sname);
                    goto out;
            }
            free(ename);
            free(sname);
        }

        ksnames[i] = NULL;
        *ks_tuple_strs = ksnames;
        return 0;

out:
        for (i = 0; i < n_ks_tuple; i++)
                free(ksnames[i]);
        free(ksnames);
        return (rc);
}

/*
 *
 */

static char **
glob_rules_keys(krb5_context context, krb5_const_principal principal)
{
    const krb5_config_binding *list;
    krb5_principal pattern;
    krb5_error_code ret;

    list = krb5_config_get_list(context, NULL, "kadmin",
                                "default_key_rules", NULL);
    if (list == NULL)
        return NULL;

    while (list) {
        if (list->type == krb5_config_string) {
            ret = krb5_parse_name(context, list->name, &pattern);
            if (ret == 0) {
                ret = krb5_principal_match(context, principal, pattern);
                krb5_free_principal(context, pattern);
                if (ret) {
                    return krb5_config_get_strings(context, list, 
                                                   list->name, NULL);
                }
            }
        }
        list = list->next;
    }
    return NULL;    
}

/*
 * NIST guidance in Section 5.1 of [SP800-132] requires that a portion
 * of the salt of at least 128 bits shall be randomly generated.
 */
static krb5_error_code
add_random_to_salt(krb5_context context, krb5_salt *in, krb5_salt *out)
{
    krb5_error_code ret;
    char *p;
    unsigned char random[16];
    char *s;
    int slen;

    krb5_generate_random_block(random, sizeof(random));

    slen = rk_base64_encode(random, sizeof(random), &s);
    if (slen < 0)
        return ENOMEM;

    ret = krb5_data_alloc(&out->saltvalue, slen + in->saltvalue.length);
    if (ret) {
        free(s);
        return ret;
    }

    p = out->saltvalue.data;
    memcpy(p, s, slen);
    memcpy(&p[slen], in->saltvalue.data, in->saltvalue.length);

    out->salttype = in->salttype;
    free(s);

    return 0;
}

/*
 * Generate the `key_set' from the [kadmin]default_keys statement. If
 * `no_salt' is set, salt is not important (and will not be set) since
 * it's random keys that is going to be created.
 */

krb5_error_code
hdb_generate_key_set(krb5_context context, krb5_principal principal,
                     krb5_key_salt_tuple *ks_tuple, int n_ks_tuple,
                     Key **ret_key_set, size_t *nkeyset, int no_salt)
{
    char **ktypes = NULL;
    char **kp;
    krb5_error_code ret;
    Key *k, *key_set;
    size_t i, j;
    char **ks_tuple_strs;
    char **config_ktypes = NULL;
    static const char *default_keytypes[] = {
        "aes256-cts-hmac-sha1-96:pw-salt",
        "des3-cbc-sha1:pw-salt",
        "arcfour-hmac-md5:pw-salt",
        NULL
    };

    if ((ret = ks_tuple2str(context, n_ks_tuple, ks_tuple, &ks_tuple_strs)))
            return ret;

    ktypes = ks_tuple_strs;
    if (ktypes == NULL) {
        config_ktypes = glob_rules_keys(context, principal);
        ktypes = config_ktypes;
    }
    if (ktypes == NULL) {
        config_ktypes = krb5_config_get_strings(context, NULL, "kadmin",
                                                "default_keys", NULL);
        ktypes = config_ktypes;
    }
    if (ktypes == NULL)
        ktypes = (char **)(intptr_t)default_keytypes;

    *ret_key_set = key_set = NULL;
    *nkeyset = 0;

    for(kp = ktypes; kp && *kp; kp++) {
        const char *p;
        krb5_salt salt;
        krb5_enctype *enctypes;
        size_t num_enctypes;

        p = *kp;
        /* check alias */
        if(strcmp(p, "v5") == 0)
            p = "pw-salt";
        else if(strcmp(p, "v4") == 0)
            p = "des:pw-salt:";
        else if(strcmp(p, "afs") == 0 || strcmp(p, "afs3") == 0)
            p = "des:afs3-salt";
        else if (strcmp(p, "arcfour-hmac-md5") == 0)
            p = "arcfour-hmac-md5:pw-salt";

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

        ret = parse_key_set(context, p,
                            &enctypes, &num_enctypes, &salt, principal);
        if (ret) {
            krb5_warn(context, ret, "bad value for default_keys `%s'", *kp);
            ret = 0;
            krb5_free_salt(context, salt);
            continue;
        }

        for (i = 0; i < num_enctypes; i++) {
            krb5_salt *saltp = no_salt ? NULL : &salt;
            krb5_salt rsalt;

            /* find duplicates */
            for (j = 0; j < *nkeyset; j++) {

                k = &key_set[j];

                if (k->key.keytype == enctypes[i]) {
                    if (no_salt)
                        break;
                    if (k->salt == NULL && salt.salttype == KRB5_PW_SALT)
                        break;
                    if (k->salt->type == salt.salttype &&
                        k->salt->salt.length == salt.saltvalue.length &&
                        memcmp(k->salt->salt.data, salt.saltvalue.data,
                               salt.saltvalue.length) == 0)
                        break;
                }
            }
            /* not a duplicate, lets add it */
            if (j < *nkeyset)
                continue;

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

            /* prepend salt with randomness if required */
            if (!no_salt &&
                _krb5_enctype_requires_random_salt(context, enctypes[i])) {
                saltp = &rsalt;
                ret = add_random_to_salt(context, &salt, &rsalt);
            }

            if (ret == 0)
                ret = add_enctype_to_key_set(&key_set, nkeyset, enctypes[i],
                                             saltp);
            krb5_free_salt(context, rsalt);

            if (ret) {
                free(enctypes);
                krb5_free_salt(context, salt);
                goto out;
            }
        }
        free(enctypes);
        krb5_free_salt(context, salt);
    }

    *ret_key_set = key_set;

 out:
    if (config_ktypes != NULL)
        krb5_config_free_strings(config_ktypes);

    for(kp = ks_tuple_strs; kp && *kp; kp++)
        free(*kp);
    free(ks_tuple_strs);

    if (ret) {
        krb5_warn(context, ret,
                  "failed to parse the [kadmin]default_keys values");

        for (i = 0; i < *nkeyset; i++)
            free_Key(&key_set[i]);
        free(key_set);
    } else if (*nkeyset == 0) {
        krb5_warnx(context,
                   "failed to parse any of the [kadmin]default_keys values");
        ret = EINVAL; /* XXX */
    }

    return ret;
}


krb5_error_code
hdb_generate_key_set_password_with_ks_tuple(krb5_context context,
                                            krb5_principal principal,
                                            const char *password,
                                            krb5_key_salt_tuple *ks_tuple,
                                            int n_ks_tuple,
                                            Key **keys, size_t *num_keys)
{
    krb5_error_code ret;
    size_t i;

    ret = hdb_generate_key_set(context, principal, ks_tuple, n_ks_tuple,
                                keys, num_keys, 0);
    if (ret)
        return ret;

    for (i = 0; i < (*num_keys); i++) {
        krb5_salt salt;
        Key *key = &(*keys)[i];

        salt.salttype = key->salt->type;
        salt.saltvalue.length = key->salt->salt.length;
        salt.saltvalue.data = key->salt->salt.data;

        ret = krb5_string_to_key_salt (context,
                                       key->key.keytype,
                                       password,
                                       salt,
                                       &key->key);
        if(ret)
            break;
    }

    if(ret) {
        hdb_free_keys (context, *num_keys, *keys);
        return ret;
    }
    return ret;
}


krb5_error_code
hdb_generate_key_set_password(krb5_context context,
                              krb5_principal principal,
                              const char *password,
                              Key **keys, size_t *num_keys)
{

    return hdb_generate_key_set_password_with_ks_tuple(context, principal,
                                                       password, NULL, 0,
                                                       keys, num_keys);
}