6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
20 * Copyright 2001,2006 The FreeRADIUS server project
21 * Copyright 2001 Kostas Kalevras <kkalev@noc.ntua.gr>
23 * Nov 03 2001, Kostas Kalevras <kkalev@noc.ntua.gr>
24 * - Added authorize() function to set Auth-Type if Chap-Password exists
25 * - Added module messages when rejecting user
28 #include <freeradius-devel/ident.h>
31 #include <freeradius-devel/radiusd.h>
32 #include <freeradius-devel/modules.h>
34 static int chap_authorize(void *instance, REQUEST *request)
37 /* quiet the compiler */
41 if (!pairfind(request->packet->vps, PW_CHAP_PASSWORD)) {
42 return RLM_MODULE_NOOP;
45 if (pairfind(request->config_items, PW_AUTHTYPE) != NULL) {
46 DEBUG2(" rlm_chap: WARNING: Auth-Type already set. Not setting to CHAP");
47 return RLM_MODULE_NOOP;
50 DEBUG(" rlm_chap: Setting 'Auth-Type := CHAP'");
51 pairadd(&request->config_items,
52 pairmake("Auth-Type", "CHAP", T_OP_EQ));
58 * Find the named user in this modules database. Create the set
59 * of attribute-value pairs to check and reply with for this user
60 * from the database. The authentication code only needs to check
61 * the password, the rest is done here.
63 static int chap_authenticate(void *instance, REQUEST *request)
65 VALUE_PAIR *passwd_item, *chap;
66 uint8_t pass_str[MAX_STRING_LEN];
67 VALUE_PAIR *module_fmsg_vp;
68 char module_fmsg[MAX_STRING_LEN];
70 /* quiet the compiler */
74 if (!request->username) {
75 radlog(L_AUTH, "rlm_chap: Attribute \"User-Name\" is required for authentication.\n");
76 return RLM_MODULE_INVALID;
79 chap = pairfind(request->packet->vps, PW_CHAP_PASSWORD);
81 radlog(L_AUTH, "rlm_chap: Attribute \"CHAP-Password\" is required for authentication.");
82 return RLM_MODULE_INVALID;
85 if (chap->length == 0) {
86 radlog(L_ERR, "rlm_chap: empty password supplied");
87 return RLM_MODULE_INVALID;
90 if (chap->length != CHAP_VALUE_LENGTH + 1) {
91 radlog(L_ERR, "rlm_chap: password supplied has wrong length");
92 return RLM_MODULE_INVALID;
96 * Don't print out the CHAP password here. It's binary crap.
98 DEBUG(" rlm_chap: login attempt by \"%s\" with CHAP password",
99 request->username->vp_strvalue);
101 if ((passwd_item = pairfind(request->config_items, PW_CLEARTEXT_PASSWORD)) == NULL){
102 DEBUG(" rlm_chap: Cleartext-Password is required for authentication");
103 snprintf(module_fmsg, sizeof(module_fmsg),
104 "rlm_chap: Clear text password not available");
105 module_fmsg_vp = pairmake("Module-Failure-Message",
106 module_fmsg, T_OP_EQ);
107 pairadd(&request->packet->vps, module_fmsg_vp);
108 return RLM_MODULE_INVALID;
111 DEBUG(" rlm_chap: Using clear text password \"%s\" for user %s authentication.",
112 passwd_item->vp_strvalue, request->username->vp_strvalue);
114 rad_chap_encode(request->packet,pass_str,
115 chap->vp_octets[0],passwd_item);
117 if (memcmp(pass_str + 1, chap->vp_octets + 1,
118 CHAP_VALUE_LENGTH) != 0){
119 DEBUG(" rlm_chap: Password check failed");
120 snprintf(module_fmsg, sizeof(module_fmsg),
121 "rlm_chap: Wrong user password");
122 module_fmsg_vp = pairmake("Module-Failure-Message",
123 module_fmsg, T_OP_EQ);
124 pairadd(&request->packet->vps, module_fmsg_vp);
125 return RLM_MODULE_REJECT;
128 DEBUG(" rlm_chap: chap user %s authenticated succesfully",
129 request->username->vp_strvalue);
131 return RLM_MODULE_OK;
135 * The module name should be the only globally exported symbol.
136 * That is, everything else should be 'static'.
138 * If the module needs to temporarily modify it's instantiation
139 * data, the type should be changed to RLM_TYPE_THREAD_UNSAFE.
140 * The server will then take care of ensuring that the module
141 * is single-threaded.
143 module_t rlm_chap = {
146 RLM_TYPE_CHECK_CONFIG_SAFE, /* type */
147 NULL, /* instantiation */
150 chap_authenticate, /* authentication */
151 chap_authorize, /* authorization */
152 NULL, /* preaccounting */
153 NULL, /* accounting */
154 NULL, /* checksimul */
155 NULL, /* pre-proxy */
156 NULL, /* post-proxy */