#include "hdb_locl.h"
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);
}
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_ARCFOUR_HMAC_MD5,
KRB5_ENCTYPE_DES3_CBC_SHA1
};
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;
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) {
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) {
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;
}
{
salt->saltvalue.data = strdup(buf[i]);
if (salt->saltvalue.data == NULL) {
krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
return ENOMEM;
}
salt->saltvalue.length = strlen(buf[i]);
}
}
if(enctypes == NULL || salt->salttype == 0) {
krb5_set_error_message(context, EINVAL, "bad value for default_keys `%s'", key);
return EINVAL;
}
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;
}
krb5_error_code
hdb_add_current_keys_to_history(krb5_context context, hdb_entry *entry)
{
krb5_boolean replace = FALSE;
krb5_error_code ret;
HDB_extension *ext;
hdb_keyset newkeyset;
time_t newtime;
if (entry->keys.len == 0)
return 0;
ext = hdb_find_extension(entry, choice_HDB_extension_data_hist_keys);
if (ext == NULL) {
replace = TRUE;
ext = calloc(1, sizeof (*ext));
if (ext == NULL)
return krb5_enomem(context);
ext->data.element = choice_HDB_extension_data_hist_keys;
}
ret = hdb_entry_get_pw_change_time(entry, &newtime);
if (ret)
goto out;
memset(&newkeyset, 0, sizeof(newkeyset));
newkeyset.keys = entry->keys;
newkeyset.kvno = entry->kvno;
newkeyset.set_time = &newtime;
ret = add_HDB_Ext_KeySet(&ext->data.u.hist_keys, &newkeyset);
if (ret)
goto out;
if (replace) {
ret = hdb_replace_extension(context, entry, ext);
if (ret)
goto out;
}
out:
if (replace && ext) {
free_HDB_extension(ext);
free(ext);
}
return ret;
}
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;
}
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;
}
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;
entry->kvno = new_kvno;
entry->keys = keyset.keys;
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;
char *ename, *sname;
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, sizeof (*ksnames))) == NULL)
return (errno);
for (i = 0; i < n_ks_tuple; i++) {
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))
goto out;
if (asprintf(&ksnames[i], "%s:%s", ename, sname) == -1) {
rc = errno;
free(ename);
free(sname);
goto out;
}
free(ename);
free(sname);
}
*ks_tuple_strs = ksnames;
rc = 0;
out:
for (i = 0; i < n_ks_tuple; i++)
free(ksnames[i]);
free(ksnames);
return (rc);
}
krb5_error_code
hdb_generate_key_set(krb5_context context, krb5_principal principal,
int n_ks_tuple, krb5_key_salt_tuple *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;
static const char *default_keytypes[] = {
"aes256-cts-hmac-sha1-96:pw-salt",
"aes128-cts-hmac-sha1-96:pw-salt",
"des3-cbc-sha1:pw-salt",
NULL
};
*ret_key_set = key_set = NULL;
*nkeyset = 0;
if ((ret = ks_tuple2str(context, n_ks_tuple, ks_tuple, &ks_tuple_strs)))
return ret;
if (ks_tuple_strs == NULL)
ktypes = krb5_config_get_strings(context, NULL, "kadmin",
"default_keys", NULL);
if (ktypes == NULL)
ktypes = (char **)(intptr_t)default_keytypes;
ret = 0;
for(kp = ktypes; kp && *kp; kp++) {
const char *p;
krb5_salt salt;
krb5_enctype *etypes;
size_t num_etypes;
p = *kp;
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,
&etypes, &num_etypes, &salt, principal);
if (ret) {
krb5_warn(context, ret, "bad value for default_keys `%s'", *kp);
ret = 0;
continue;
}
for (i = 0; i < num_etypes; i++) {
for (j = 0; j < *nkeyset; j++) {
k = &key_set[j];
if (k->key.keytype == etypes[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;
}
}
if (j == *nkeyset) {
ret = add_enctype_to_key_set(&key_set, nkeyset, etypes[i],
no_salt ? NULL : &salt);
if (ret) {
free(etypes);
krb5_free_salt(context, salt);
goto out;
}
}
}
free(etypes);
krb5_free_salt(context, salt);
}
*ret_key_set = key_set;
out:
if (ktypes != (char **)(intptr_t)default_keytypes)
krb5_config_free_strings(ktypes);
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;
}
return ret;
}
krb5_error_code
hdb_generate_key_set_password(krb5_context context,
krb5_principal principal,
const char *password,
int n_ks_tuple, krb5_key_salt_tuple *ks_tuple,
Key **keys, size_t *num_keys)
{
krb5_error_code ret;
size_t i;
*keys = NULL;
*num_keys = 0;
ret = hdb_generate_key_set(context, principal, n_ks_tuple, ks_tuple,
keys, num_keys, 0);
if (ret)
return ret;
for (i = 0; i < (*num_keys); i++) {
krb5_salt salt;
if ((*keys)[i].salt) {
salt.salttype = (*keys)[i].salt->type;
salt.saltvalue.length = (*keys)[i].salt->salt.length;
salt.saltvalue.data = (*keys)[i].salt->salt.data;
} else {
memset(&salt, 0, sizeof(salt));
}
ret = krb5_string_to_key_salt (context,
(*keys)[i].key.keytype,
password,
salt,
&(*keys)[i].key);
if(ret)
break;
}
if(ret) {
hdb_free_keys (context, *num_keys, *keys);
return ret;
}
return ret;
}