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/* Copyright 2010, 2011 NORDUnet A/S. All rights reserved.
See the file COPYING for licensing information. */
#if defined HAVE_CONFIG_H
#include <config.h>
#endif
#include <confuse.h>
#include <string.h>
#include <assert.h>
#include <radsec/radsec.h>
#include <radsec/radsec-impl.h>
#include "peer.h"
#include "debug.h"
#if 0
# common config options
dictionary = STRING
# common realm config options
realm NAME {
type = "UDP"|"TCP"|"TLS"|"DTLS"
timeout = INT
retries = INT
cacertfile = STRING
#cacertpath = STRING
certfile = STRING
certkeyfile = STRING
pskstr = STRING # Transport pre-shared key, UTF-8 form.
pskhexstr = STRING # Transport pre-shared key, ASCII hex form.
pskid = STRING
pskex = "PSK"|"DHE_PSK"|"RSA_PSK"
}
# client specific realm config options
realm NAME {
server {
hostname = STRING
service = STRING
secret = STRING # RADIUS secret
}
}
#endif
/* FIXME: Leaking memory in error cases? */
int
rs_context_read_config(struct rs_context *ctx, const char *config_file)
{
cfg_t *cfg, *cfg_realm, *cfg_server;
int err = 0;
int i, j;
const char *s;
struct rs_config *config = NULL;
cfg_opt_t server_opts[] =
{
CFG_STR ("hostname", NULL, CFGF_NONE),
CFG_STR ("service", "2083", CFGF_NONE),
CFG_STR ("secret", "radsec", CFGF_NONE),
CFG_END ()
};
cfg_opt_t realm_opts[] =
{
CFG_STR ("type", "UDP", CFGF_NONE),
CFG_INT ("timeout", 2, CFGF_NONE), /* FIXME: Remove? */
CFG_INT ("retries", 2, CFGF_NONE), /* FIXME: Remove? */
CFG_STR ("cacertfile", NULL, CFGF_NONE),
/*CFG_STR ("cacertpath", NULL, CFGF_NONE),*/
CFG_STR ("certfile", NULL, CFGF_NONE),
CFG_STR ("certkeyfile", NULL, CFGF_NONE),
CFG_STR ("pskstr", NULL, CFGF_NONE),
CFG_STR ("pskhexstr", NULL, CFGF_NONE),
CFG_STR ("pskid", NULL, CFGF_NONE),
CFG_STR ("pskex", "PSK", CFGF_NONE),
CFG_SEC ("server", server_opts, CFGF_MULTI),
CFG_END ()
};
cfg_opt_t opts[] =
{
CFG_STR ("dictionary", NULL, CFGF_NONE),
CFG_SEC ("realm", realm_opts, CFGF_TITLE | CFGF_MULTI),
CFG_END ()
};
cfg = cfg_init (opts, CFGF_NONE);
if (cfg == NULL)
return rs_err_ctx_push (ctx, RSE_CONFIG, "unable to initialize libconfuse");
err = cfg_parse (cfg, config_file);
switch (err)
{
case CFG_SUCCESS:
break;
case CFG_FILE_ERROR:
return rs_err_ctx_push (ctx, RSE_CONFIG,
"%s: unable to open configuration file",
config_file);
case CFG_PARSE_ERROR:
return rs_err_ctx_push (ctx, RSE_CONFIG, "%s: invalid configuration file",
config_file);
default:
return rs_err_ctx_push (ctx, RSE_CONFIG, "%s: unknown parse error",
config_file);
}
config = rs_calloc (ctx, 1, sizeof (*config));
if (config == NULL)
return rs_err_ctx_push_fl (ctx, RSE_NOMEM, __FILE__, __LINE__, NULL);
ctx->config = config;
config->dictionary = cfg_getstr (cfg, "dictionary");
for (i = 0; i < cfg_size (cfg, "realm"); i++)
{
struct rs_realm *r = NULL;
const char *typestr;
char *pskstr = NULL, *pskhexstr = NULL;
r = rs_calloc (ctx, 1, sizeof(*r));
if (r == NULL)
return rs_err_ctx_push_fl (ctx, RSE_NOMEM, __FILE__, __LINE__, NULL);
if (config->realms != NULL)
{
r->next = config->realms->next;
config->realms->next = r;
}
else
{
config->realms = r;
}
cfg_realm = cfg_getnsec (cfg, "realm", i);
s = cfg_title (cfg_realm);
if (s == NULL)
return rs_err_ctx_push_fl (ctx, RSE_CONFIG, __FILE__, __LINE__,
"missing realm name");
/* We use a copy of the return value of cfg_title() since it's const. */
r->name = strdup (s);
if (r->name == NULL)
return rs_err_ctx_push_fl (ctx, RSE_NOMEM, __FILE__, __LINE__, NULL);
typestr = cfg_getstr (cfg_realm, "type");
if (strcmp (typestr, "UDP") == 0)
r->type = RS_CONN_TYPE_UDP;
else if (strcmp (typestr, "TCP") == 0)
r->type = RS_CONN_TYPE_TCP;
else if (strcmp (typestr, "TLS") == 0)
r->type = RS_CONN_TYPE_TLS;
else if (strcmp (typestr, "DTLS") == 0)
r->type = RS_CONN_TYPE_DTLS;
else
return rs_err_ctx_push_fl (ctx, RSE_CONFIG, __FILE__, __LINE__,
"invalid connection type: %s", typestr);
r->timeout = cfg_getint (cfg_realm, "timeout");
r->retries = cfg_getint (cfg_realm, "retries");
r->cacertfile = cfg_getstr (cfg_realm, "cacertfile");
/*r->cacertpath = cfg_getstr (cfg_realm, "cacertpath");*/
r->certfile = cfg_getstr (cfg_realm, "certfile");
r->certkeyfile = cfg_getstr (cfg_realm, "certkeyfile");
pskstr = cfg_getstr (cfg_realm, "pskstr");
pskhexstr = cfg_getstr (cfg_realm, "pskhexstr");
if (pskstr || pskhexstr)
{
char *kex = cfg_getstr (cfg_realm, "pskex");
rs_cred_type_t type = RS_CRED_NONE;
struct rs_credentials *cred = NULL;
assert (kex != NULL);
if (!strcmp (kex, "PSK"))
type = RS_CRED_TLS_PSK;
else
{
/* TODO: push a warning, using a separate warn stack or
onto the ordinary error stack? */
/* rs_err_ctx_push (ctx, FIXME, "%s: unsupported PSK key exchange"
" algorithm -- PSK not used", kex);*/
}
if (type != RS_CRED_NONE)
{
cred = rs_calloc (ctx, 1, sizeof (*cred));
if (cred == NULL)
return rs_err_ctx_push_fl (ctx, RSE_NOMEM, __FILE__, __LINE__,
NULL);
cred->type = type;
cred->identity = cfg_getstr (cfg_realm, "pskid");
if (pskhexstr)
{
cred->secret_encoding = RS_KEY_ENCODING_ASCII_HEX;
cred->secret = pskhexstr;
if (pskstr)
; /* TODO: warn that we're ignoring pskstr */
}
else
{
cred->secret_encoding = RS_KEY_ENCODING_UTF8;
cred->secret = pskstr;
}
r->transport_cred = cred;
}
}
/* Add peers, one per server stanza. */
for (j = 0; j < cfg_size (cfg_realm, "server"); j++)
{
struct rs_peer *p = peer_create (ctx, &r->peers);
if (p == NULL)
return rs_err_ctx_push_fl (ctx, RSE_NOMEM, __FILE__, __LINE__,
NULL);
p->realm = r;
cfg_server = cfg_getnsec (cfg_realm, "server", j);
/* FIXME: Handle resolve errors, possibly by postponing name
resolution. */
rs_resolv (&p->addr, r->type, cfg_getstr (cfg_server, "hostname"),
cfg_getstr (cfg_server, "service"));
p->secret = cfg_getstr (cfg_server, "secret");
}
}
/* Save config object in context, for freeing in rs_context_destroy(). */
ctx->config->cfg = cfg;
return RSE_OK;
}
struct rs_realm *
rs_conf_find_realm(struct rs_context *ctx, const char *name)
{
struct rs_realm *r;
for (r = ctx->config->realms; r; r = r->next)
if (strcmp (r->name, name) == 0)
return r;
return NULL;
}
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