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/*
* This program is is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
/**
* $Id$
* @file rlm_chap.c
* @brief Process chap authentication requests.
*
* @copyright 2001,2006 The FreeRADIUS server project
* @copyright 2001 Kostas Kalevras <kkalev@noc.ntua.gr>
*/
RCSID("$Id$")
#include <freeradius-devel/radiusd.h>
#include <freeradius-devel/modules.h>
static rlm_rcode_t CC_HINT(nonnull) mod_authorize(UNUSED void *instance, REQUEST *request)
{
if (!fr_pair_find_by_num(request->packet->vps, PW_CHAP_PASSWORD, 0, TAG_ANY)) {
return RLM_MODULE_NOOP;
}
if (fr_pair_find_by_num(request->config, PW_AUTH_TYPE, 0, TAG_ANY) != NULL) {
RWDEBUG2("&control:Auth-Type already set. Not setting to CHAP");
return RLM_MODULE_NOOP;
}
RINDENT();
RDEBUG("&control:Auth-Type := CHAP");
REXDENT();
pair_make_config("Auth-Type", "CHAP", T_OP_EQ);
return RLM_MODULE_OK;
}
/*
* Find the named user in this modules database. Create the set
* of attribute-value pairs to check and reply with for this user
* from the database. The authentication code only needs to check
* the password, the rest is done here.
*/
static rlm_rcode_t CC_HINT(nonnull) mod_authenticate(UNUSED void *instance, REQUEST *request)
{
VALUE_PAIR *password, *chap;
uint8_t pass_str[MAX_STRING_LEN];
if (!request->username) {
REDEBUG("&request:User-Name attribute is required for authentication");
return RLM_MODULE_INVALID;
}
chap = fr_pair_find_by_num(request->packet->vps, PW_CHAP_PASSWORD, 0, TAG_ANY);
if (!chap) {
REDEBUG("You set '&control:Auth-Type = CHAP' for a request that "
"does not contain a CHAP-Password attribute!");
return RLM_MODULE_INVALID;
}
if (chap->vp_length == 0) {
REDEBUG("&request:CHAP-Password is empty");
return RLM_MODULE_INVALID;
}
if (chap->vp_length != CHAP_VALUE_LENGTH + 1) {
REDEBUG("&request:CHAP-Password has invalid length");
return RLM_MODULE_INVALID;
}
password = fr_pair_find_by_num(request->config, PW_CLEARTEXT_PASSWORD, 0, TAG_ANY);
if (password == NULL) {
if (fr_pair_find_by_num(request->config, PW_USER_PASSWORD, 0, TAG_ANY) != NULL){
REDEBUG("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
REDEBUG("!!! Please update your configuration so that the \"known !!!");
REDEBUG("!!! good\" cleartext password is in Cleartext-Password, !!!");
REDEBUG("!!! and NOT in User-Password. !!!");
REDEBUG("!!! !!!");
REDEBUG("!!! Authentication will fail because of this. !!!");
REDEBUG("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
}
REDEBUG("&control:Cleartext-Password is required for authentication");
return RLM_MODULE_FAIL;
}
rad_chap_encode(request->packet, pass_str, chap->vp_octets[0], password);
if (RDEBUG_ENABLED3) {
uint8_t const *p;
size_t length;
VALUE_PAIR *vp;
char buffer[MAX_STRING_LEN * 2 + 1];
RDEBUG3("Comparing with \"known good\" &control:Cleartext-Password value \"%s\"",
password->vp_strvalue);
vp = fr_pair_find_by_num(request->packet->vps, PW_CHAP_CHALLENGE, 0, TAG_ANY);
if (vp) {
RDEBUG2("Using challenge from &request:CHAP-Challenge");
p = vp->vp_octets;
length = vp->vp_length;
} else {
RDEBUG2("Using challenge from authenticator field");
p = request->packet->vector;
length = sizeof(request->packet->vector);
}
fr_bin2hex(buffer, p, length);
RINDENT();
RDEBUG3("CHAP challenge : %s", buffer);
fr_bin2hex(buffer, chap->vp_octets + 1, CHAP_VALUE_LENGTH);
RDEBUG3("Client sent : %s", buffer);
fr_bin2hex(buffer, pass_str + 1, CHAP_VALUE_LENGTH);
RDEBUG3("We calculated : %s", buffer);
REXDENT();
} else {
RDEBUG2("Comparing with \"known good\" Cleartext-Password");
}
if (rad_digest_cmp(pass_str + 1, chap->vp_octets + 1, CHAP_VALUE_LENGTH) != 0) {
REDEBUG("Password comparison failed: password is incorrect");
return RLM_MODULE_REJECT;
}
RDEBUG("CHAP user \"%s\" authenticated successfully", request->username->vp_strvalue);
return RLM_MODULE_OK;
}
/*
* The module name should be the only globally exported symbol.
* That is, everything else should be 'static'.
*
* If the module needs to temporarily modify it's instantiation
* data, the type should be changed to RLM_TYPE_THREAD_UNSAFE.
* The server will then take care of ensuring that the module
* is single-threaded.
*/
extern module_t rlm_chap;
module_t rlm_chap = {
.magic = RLM_MODULE_INIT,
.name = "chap",
.methods = {
[MOD_AUTHENTICATE] = mod_authenticate,
[MOD_AUTHORIZE] = mod_authorize,
},
};
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