OpenBSD-4.6/kerberosV/src/lib/krb5/context.c
/*
* Copyright (c) 1997 - 2005 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 <com_err.h>
RCSID("$KTH: context.c,v 1.102 2005/05/18 04:20:50 lha Exp $");
#define INIT_FIELD(C, T, E, D, F) \
(C)->E = krb5_config_get_ ## T ## _default ((C), NULL, (D), \
"libdefaults", F, NULL)
/*
* Set the list of etypes `ret_etypes' from the configuration variable
* `name'
*/
static krb5_error_code
set_etypes (krb5_context context,
const char *name,
krb5_enctype **ret_enctypes)
{
char **etypes_str;
krb5_enctype *etypes = NULL;
etypes_str = krb5_config_get_strings(context, NULL, "libdefaults",
name, NULL);
if(etypes_str){
int i, j, k;
for(i = 0; etypes_str[i]; i++);
etypes = malloc((i+1) * sizeof(*etypes));
if (etypes == NULL) {
krb5_config_free_strings (etypes_str);
krb5_set_error_string (context, "malloc: out of memory");
return ENOMEM;
}
for(j = 0, k = 0; j < i; j++) {
krb5_enctype e;
if(krb5_string_to_enctype(context, etypes_str[j], &e) != 0)
continue;
if (krb5_enctype_valid(context, e) != 0)
continue;
etypes[k++] = e;
}
etypes[k] = ETYPE_NULL;
krb5_config_free_strings(etypes_str);
}
*ret_enctypes = etypes;
return 0;
}
/*
* read variables from the configuration file and set in `context'
*/
static krb5_error_code
init_context_from_config_file(krb5_context context)
{
krb5_error_code ret;
const char * tmp;
krb5_enctype *tmptypes;
INIT_FIELD(context, time, max_skew, 5 * 60, "clockskew");
INIT_FIELD(context, time, kdc_timeout, 3, "kdc_timeout");
INIT_FIELD(context, int, max_retries, 3, "max_retries");
INIT_FIELD(context, string, http_proxy, NULL, "http_proxy");
ret = set_etypes (context, "default_etypes", &tmptypes);
if(ret)
return ret;
free(context->etypes);
context->etypes = tmptypes;
ret = set_etypes (context, "default_etypes_des", &tmptypes);
if(ret)
return ret;
free(context->etypes_des);
context->etypes_des = tmptypes;
/* default keytab name */
tmp = NULL;
if(!issuid())
tmp = getenv("KRB5_KTNAME");
if(tmp != NULL)
context->default_keytab = tmp;
else
INIT_FIELD(context, string, default_keytab,
KEYTAB_DEFAULT, "default_keytab_name");
INIT_FIELD(context, string, default_keytab_modify,
NULL, "default_keytab_modify_name");
INIT_FIELD(context, string, time_fmt,
"%Y-%m-%dT%H:%M:%S", "time_format");
INIT_FIELD(context, string, date_fmt,
"%Y-%m-%d", "date_format");
INIT_FIELD(context, bool, log_utc,
FALSE, "log_utc");
/* init dns-proxy slime */
tmp = krb5_config_get_string(context, NULL, "libdefaults",
"dns_proxy", NULL);
if(tmp)
roken_gethostby_setup(context->http_proxy, tmp);
krb5_free_host_realm (context, context->default_realms);
context->default_realms = NULL;
{
krb5_addresses addresses;
char **adr, **a;
krb5_set_extra_addresses(context, NULL);
adr = krb5_config_get_strings(context, NULL,
"libdefaults",
"extra_addresses",
NULL);
memset(&addresses, 0, sizeof(addresses));
for(a = adr; a && *a; a++) {
ret = krb5_parse_address(context, *a, &addresses);
if (ret == 0) {
krb5_add_extra_addresses(context, &addresses);
krb5_free_addresses(context, &addresses);
}
}
krb5_config_free_strings(adr);
krb5_set_ignore_addresses(context, NULL);
adr = krb5_config_get_strings(context, NULL,
"libdefaults",
"ignore_addresses",
NULL);
memset(&addresses, 0, sizeof(addresses));
for(a = adr; a && *a; a++) {
ret = krb5_parse_address(context, *a, &addresses);
if (ret == 0) {
krb5_add_ignore_addresses(context, &addresses);
krb5_free_addresses(context, &addresses);
}
}
krb5_config_free_strings(adr);
}
INIT_FIELD(context, bool, scan_interfaces, TRUE, "scan_interfaces");
INIT_FIELD(context, int, fcache_vno, 0, "fcache_version");
/* prefer dns_lookup_kdc over srv_lookup. */
INIT_FIELD(context, bool, srv_lookup, TRUE, "srv_lookup");
INIT_FIELD(context, bool, srv_lookup, context->srv_lookup, "dns_lookup_kdc");
INIT_FIELD(context, int, large_msg_size, 6000, "large_message_size");
context->default_cc_name = NULL;
return 0;
}
krb5_error_code KRB5_LIB_FUNCTION
krb5_init_context(krb5_context *context)
{
krb5_context p;
krb5_error_code ret;
char **files;
*context = NULL;
p = calloc(1, sizeof(*p));
if(!p)
return ENOMEM;
p->mutex = malloc(sizeof(HEIMDAL_MUTEX));
if (p->mutex == NULL) {
free(p);
return ENOMEM;
}
HEIMDAL_MUTEX_init(p->mutex);
ret = krb5_get_default_config_files(&files);
if(ret)
goto out;
ret = krb5_set_config_files(p, files);
krb5_free_config_files(files);
if(ret)
goto out;
/* init error tables */
krb5_init_ets(p);
p->cc_ops = NULL;
p->num_cc_ops = 0;
krb5_cc_register(p, &krb5_acc_ops, TRUE);
krb5_cc_register(p, &krb5_fcc_ops, TRUE);
krb5_cc_register(p, &krb5_mcc_ops, TRUE);
#ifdef HAVE_KCM
krb5_cc_register(p, &krb5_kcm_ops, TRUE);
#endif
p->num_kt_types = 0;
p->kt_types = NULL;
krb5_kt_register (p, &krb5_fkt_ops);
krb5_kt_register (p, &krb5_wrfkt_ops);
krb5_kt_register (p, &krb5_javakt_ops);
krb5_kt_register (p, &krb5_mkt_ops);
krb5_kt_register (p, &krb5_akf_ops);
krb5_kt_register (p, &krb4_fkt_ops);
krb5_kt_register (p, &krb5_srvtab_fkt_ops);
krb5_kt_register (p, &krb5_any_ops);
out:
if(ret) {
krb5_free_context(p);
p = NULL;
}
*context = p;
return ret;
}
void KRB5_LIB_FUNCTION
krb5_free_context(krb5_context context)
{
if (context->default_cc_name)
free(context->default_cc_name);
free(context->etypes);
free(context->etypes_des);
krb5_free_host_realm (context, context->default_realms);
krb5_config_file_free (context, context->cf);
free_error_table (context->et_list);
free(context->cc_ops);
free(context->kt_types);
krb5_clear_error_string(context);
if(context->warn_dest != NULL)
krb5_closelog(context, context->warn_dest);
krb5_set_extra_addresses(context, NULL);
krb5_set_ignore_addresses(context, NULL);
if (context->mutex != NULL) {
HEIMDAL_MUTEX_destroy(context->mutex);
free(context->mutex);
}
memset(context, 0, sizeof(*context));
free(context);
}
krb5_error_code KRB5_LIB_FUNCTION
krb5_set_config_files(krb5_context context, char **filenames)
{
krb5_error_code ret;
krb5_config_binding *tmp = NULL;
while(filenames != NULL && *filenames != NULL && **filenames != '\0') {
ret = krb5_config_parse_file_multi(context, *filenames, &tmp);
if(ret != 0 && ret != ENOENT && ret != EACCES) {
krb5_config_file_free(context, tmp);
return ret;
}
filenames++;
}
#if 0
/* with this enabled and if there are no config files, Kerberos is
considererd disabled */
if(tmp == NULL)
return ENXIO;
#endif
krb5_config_file_free(context, context->cf);
context->cf = tmp;
ret = init_context_from_config_file(context);
return ret;
}
static krb5_error_code
add_file(char ***pfilenames, int *len, char *file)
{
char **pp = *pfilenames;
int i;
for(i = 0; i < *len; i++) {
if(strcmp(pp[i], file) == 0) {
free(file);
return 0;
}
}
pp = realloc(*pfilenames, (*len + 2) * sizeof(*pp));
if (pp == NULL) {
free(file);
return ENOMEM;
}
pp[*len] = file;
pp[*len + 1] = NULL;
*pfilenames = pp;
*len += 1;
return 0;
}
/*
* `pq' isn't free, its up the the caller
*/
krb5_error_code KRB5_LIB_FUNCTION
krb5_prepend_config_files(const char *filelist, char **pq, char ***ret_pp)
{
krb5_error_code ret;
const char *p, *q;
char **pp;
int len;
char *fn;
pp = NULL;
len = 0;
p = filelist;
while(1) {
ssize_t l;
q = p;
l = strsep_copy(&q, ":", NULL, 0);
if(l == -1)
break;
fn = malloc(l + 1);
if(fn == NULL) {
krb5_free_config_files(pp);
return ENOMEM;
}
l = strsep_copy(&p, ":", fn, l + 1);
ret = add_file(&pp, &len, fn);
if (ret) {
krb5_free_config_files(pp);
return ret;
}
}
if (pq != NULL) {
int i;
for (i = 0; pq[i] != NULL; i++) {
fn = strdup(pq[i]);
if (fn == NULL) {
krb5_free_config_files(pp);
return ENOMEM;
}
ret = add_file(&pp, &len, fn);
if (ret) {
krb5_free_config_files(pp);
return ret;
}
}
}
*ret_pp = pp;
return 0;
}
krb5_error_code KRB5_LIB_FUNCTION
krb5_prepend_config_files_default(const char *filelist, char ***pfilenames)
{
krb5_error_code ret;
char **defpp, **pp = NULL;
ret = krb5_get_default_config_files(&defpp);
if (ret)
return ret;
ret = krb5_prepend_config_files(filelist, defpp, &pp);
krb5_free_config_files(defpp);
if (ret) {
return ret;
}
*pfilenames = pp;
return 0;
}
krb5_error_code KRB5_LIB_FUNCTION
krb5_get_default_config_files(char ***pfilenames)
{
const char *files = NULL;
if (pfilenames == NULL)
return EINVAL;
if(!issuid())
files = getenv("KRB5_CONFIG");
if (files == NULL)
files = krb5_config_file;
return krb5_prepend_config_files(files, NULL, pfilenames);
}
void KRB5_LIB_FUNCTION
krb5_free_config_files(char **filenames)
{
char **p;
for(p = filenames; *p != NULL; p++)
free(*p);
free(filenames);
}
/*
* set `etype' to a malloced list of the default enctypes
*/
static krb5_error_code
default_etypes(krb5_context context, krb5_enctype **etype)
{
krb5_enctype p[] = {
ETYPE_AES256_CTS_HMAC_SHA1_96,
ETYPE_AES128_CTS_HMAC_SHA1_96,
ETYPE_DES3_CBC_SHA1,
ETYPE_DES3_CBC_MD5,
ETYPE_ARCFOUR_HMAC_MD5,
ETYPE_DES_CBC_MD5,
ETYPE_DES_CBC_MD4,
ETYPE_DES_CBC_CRC
};
krb5_enctype *e = NULL, *ep;
int i, n = 0;
for (i = 0; i < sizeof(p)/sizeof(p[0]); i++) {
if (krb5_enctype_valid(context, p[i]) != 0)
continue;
ep = realloc(e, (n + 2) * sizeof(*e));
if (ep == NULL) {
free(e);
krb5_set_error_string (context, "malloc: out of memory");
return ENOMEM;
}
e = ep;
e[n] = p[i];
e[n + 1] = ETYPE_NULL;
n++;
}
*etype = e;
return 0;
}
krb5_error_code KRB5_LIB_FUNCTION
krb5_set_default_in_tkt_etypes(krb5_context context,
const krb5_enctype *etypes)
{
krb5_enctype *p = NULL;
int i;
if(etypes) {
for (i = 0; etypes[i]; ++i) {
krb5_error_code ret;
ret = krb5_enctype_valid(context, etypes[i]);
if (ret)
return ret;
}
++i;
ALLOC(p, i);
if(!p) {
krb5_set_error_string (context, "malloc: out of memory");
return ENOMEM;
}
memmove(p, etypes, i * sizeof(krb5_enctype));
}
if(context->etypes)
free(context->etypes);
context->etypes = p;
return 0;
}
krb5_error_code KRB5_LIB_FUNCTION
krb5_get_default_in_tkt_etypes(krb5_context context,
krb5_enctype **etypes)
{
krb5_enctype *p;
int i;
krb5_error_code ret;
if(context->etypes) {
for(i = 0; context->etypes[i]; i++);
++i;
ALLOC(p, i);
if(!p) {
krb5_set_error_string (context, "malloc: out of memory");
return ENOMEM;
}
memmove(p, context->etypes, i * sizeof(krb5_enctype));
} else {
ret = default_etypes(context, &p);
if (ret)
return ret;
}
*etypes = p;
return 0;
}
const char* KRB5_LIB_FUNCTION
krb5_get_err_text(krb5_context context, krb5_error_code code)
{
const char *p = NULL;
if(context != NULL)
p = com_right(context->et_list, code);
if(p == NULL)
p = strerror(code);
if (p == NULL)
p = "Unknown error";
return p;
}
void KRB5_LIB_FUNCTION
krb5_init_ets(krb5_context context)
{
if(context->et_list == NULL){
krb5_add_et_list(context, initialize_krb5_error_table_r);
krb5_add_et_list(context, initialize_asn1_error_table_r);
krb5_add_et_list(context, initialize_heim_error_table_r);
krb5_add_et_list(context, initialize_k524_error_table_r);
}
}
void KRB5_LIB_FUNCTION
krb5_set_use_admin_kdc (krb5_context context, krb5_boolean flag)
{
context->use_admin_kdc = flag;
}
krb5_boolean KRB5_LIB_FUNCTION
krb5_get_use_admin_kdc (krb5_context context)
{
return context->use_admin_kdc;
}
krb5_error_code KRB5_LIB_FUNCTION
krb5_add_extra_addresses(krb5_context context, krb5_addresses *addresses)
{
if(context->extra_addresses)
return krb5_append_addresses(context,
context->extra_addresses, addresses);
else
return krb5_set_extra_addresses(context, addresses);
}
krb5_error_code KRB5_LIB_FUNCTION
krb5_set_extra_addresses(krb5_context context, const krb5_addresses *addresses)
{
if(context->extra_addresses)
krb5_free_addresses(context, context->extra_addresses);
if(addresses == NULL) {
if(context->extra_addresses != NULL) {
free(context->extra_addresses);
context->extra_addresses = NULL;
}
return 0;
}
if(context->extra_addresses == NULL) {
context->extra_addresses = malloc(sizeof(*context->extra_addresses));
if(context->extra_addresses == NULL) {
krb5_set_error_string (context, "malloc: out of memory");
return ENOMEM;
}
}
return krb5_copy_addresses(context, addresses, context->extra_addresses);
}
krb5_error_code KRB5_LIB_FUNCTION
krb5_get_extra_addresses(krb5_context context, krb5_addresses *addresses)
{
if(context->extra_addresses == NULL) {
memset(addresses, 0, sizeof(*addresses));
return 0;
}
return krb5_copy_addresses(context,context->extra_addresses, addresses);
}
krb5_error_code KRB5_LIB_FUNCTION
krb5_add_ignore_addresses(krb5_context context, krb5_addresses *addresses)
{
if(context->ignore_addresses)
return krb5_append_addresses(context,
context->ignore_addresses, addresses);
else
return krb5_set_ignore_addresses(context, addresses);
}
krb5_error_code KRB5_LIB_FUNCTION
krb5_set_ignore_addresses(krb5_context context, const krb5_addresses *addresses)
{
if(context->ignore_addresses)
krb5_free_addresses(context, context->ignore_addresses);
if(addresses == NULL) {
if(context->ignore_addresses != NULL) {
free(context->ignore_addresses);
context->ignore_addresses = NULL;
}
return 0;
}
if(context->ignore_addresses == NULL) {
context->ignore_addresses = malloc(sizeof(*context->ignore_addresses));
if(context->ignore_addresses == NULL) {
krb5_set_error_string (context, "malloc: out of memory");
return ENOMEM;
}
}
return krb5_copy_addresses(context, addresses, context->ignore_addresses);
}
krb5_error_code KRB5_LIB_FUNCTION
krb5_get_ignore_addresses(krb5_context context, krb5_addresses *addresses)
{
if(context->ignore_addresses == NULL) {
memset(addresses, 0, sizeof(*addresses));
return 0;
}
return krb5_copy_addresses(context, context->ignore_addresses, addresses);
}
krb5_error_code KRB5_LIB_FUNCTION
krb5_set_fcache_version(krb5_context context, int version)
{
context->fcache_vno = version;
return 0;
}
krb5_error_code KRB5_LIB_FUNCTION
krb5_get_fcache_version(krb5_context context, int *version)
{
*version = context->fcache_vno;
return 0;
}
krb5_boolean KRB5_LIB_FUNCTION
krb5_is_thread_safe(void)
{
#ifdef ENABLE_PTHREAD_SUPPORT
return TRUE;
#else
return FALSE;
#endif
}