6 * Copyright (c) 2012, JANET(UK)
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10 * modification, are permitted provided that the following conditions
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21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
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37 #include <freeradius-devel/ident.h>
40 #include "eap_chbind.h"
42 #define MAX_PACKET_LEN 1024
45 * Process any channel bindings included in the request.
47 CHBIND_REQ *chbind_allocate()
50 ret = malloc(sizeof CHBIND_REQUQEST);
52 memset(ret, 0, sizeof CHBIND_REQUEST);
56 void *chbind_free(CHBIND_REQ *chbind)
58 /* free the chbind response, if allocated by chbind_process */
59 if (chbind->chbind_resp)
65 int chbind_process(REQUEST *req, CHBIND_REQ *chbind_req)
67 int rcode = PW_AUTHENTICATION_REJECT;
69 VALUE_PAIR *user_vp = NULL;
74 /* check input parameters */
75 rad_assert((request != NULL) &&
76 (chbind_req != NULL) &&
77 (chbind_req->username != NULL) &&
78 (chbind_req->chbind_req_buf != NULL));
79 if (chbind_req->len < 4)
80 return PW_AUTHENTICATION_REJECT; /* Is this the right response? */
82 /* Set-up NULL response for cases where channel bindings can't be processed */
83 chbind_req->chbind_resp = NULL;
84 chbind_req->chbind_resp_len = 0;
86 /* Set-up the fake request */
87 fake = request_alloc_fake(request);
88 rad_assert(fake->packet->vps == NULL);
89 vp = pairmake("Freeradius-Proxied-To", "127.0.0.1", T_OP_EQ);
91 pairadd(&fake->packet->vps, vp);
94 /* Add the username to the fake request */
95 vp = paircreate(PW_USER_NAME, 0, PW_TYPE_STRING);
97 memcpy(vp->vp_octets, chbind_req->username, chbind_req->username_len);
98 vp->length = chbind_req->username_len;
100 pairadd(&fake->packet-vps, vp);
101 fake->username = pairfind(fake->packet->vps, PW_USER_NAME, 0);
103 /* Copy the request state into the fake request */
104 vp = paircopy(req->state);
106 pairadd(&fake->packet->vps, vp);
108 /* Add the channel binding attributes to the fake packet */
109 if (0 != (datalen = chbind_get_data((chbind_packet_t *)chbind_req, chbind_req_len,
110 CHBIND_NSID_RADIUS, &attr_data))) {
111 if (0 < radattr2vp(NULL, NULL, NULL, attr_data, datalen, &vp)) {
112 /* If radaddr2vp fails, return NULL string for channel binding response */
114 return PW_AUTHENTICATION_OK;
117 pairadd(&fake->packet->vps, vp);
120 /* Set virtual server based on configuration for channel bindings,
121 this is hard-coded to "chbind" for now */
122 fake->server = pairmake("Virtual-Server", "chbind", T_OP_EQ);
124 /* Call rad_authenticate */
125 rad_authenticate(fake);
127 switch(fake->reply->code) {
128 /* If rad_authenticate succeeded, build a reply */
130 case RLM_MODULE_HANDLED:
131 if (chbind_req->chbind_resp = chbind_build_response(fake, &chbind_req->chbind_resp_len))
132 rcode = PW_AUTHENTICATION_ACK;
134 rcode = PW_AUTHENTICATION_REJECT;
137 /* If we got any other response from rad_authenticate, it maps to a reject */
139 rcode = PW_AUTHENTICATION_REJECT;
149 * Parse channel binding packet to obtain data for a specific NSID.
150 * See http://tools.ietf.org/html/draft-ietf-emu-chbind-13#section-5.3.2:
153 size_t chbind_get_data(chbind_packet_t *chbind_packet,
154 size_t chbind_packet_len,
156 uint8_t **radbuf_data)
158 size_t chbind_data_len = chbind_packet_len-1;
160 if (chbind_packet->code != CHBIND_CODE_REQUEST)
162 while (pos + 3 < chbind_data_len) {
163 size_t len = (chbind_packet->data[pos] << 8) +
164 chbind_packet->data[pos + 1];
165 uint8_t nsid = chbind_packet->data[pos + 2];
166 if (pos + 3 > chbind_data_len + len) {
167 /* malformed packet; warn here */
170 if (nsid == desired_nsid) {
171 *radbuf_data = &chbind_packet->data[pos+3];
176 /* didn't find any data matching nsid */
177 if (pos != chbind_data_len) {
178 /* warn about malformed packet */
184 uint8_t *chbind_build_response(REQUEST *req, int *resp_len)
186 uint8_t *resp, *rp = NULL;
187 uint16_t rlen, len = 0;
190 resp = malloc(MAX_PACKET_LEN + 4);
193 /* Set-up the chbind header fields (except length, computed later) */
194 vp = pairfind(fake->config_items, PW_CHBIND_RESPONSE_CODE, 0);
195 resp[0] = vp->vp_integer;
197 resp[3] = CHBIND_NSID_RADIUS;
199 /* Encode the chbind attributes into the response */
200 for (vp = fake->reply->vps, rlen = 4;
201 (vp != NULL) && (rlen < MAX_PACKET_LEN + 4);
203 len = rad_vp2attr(NULL, NULL, NULL, *vp, resp[rlen], (MAX_PACKET_LEN + 4) - rlen);
206 /* Write the length field into the header */
207 resp[1] = (uint8_t)(rlen >> 8);
208 resp[2] = (uint8_t)(rlen & 0x00FF);
209 size_t len = (chbind_packet->data[pos] << 8) +
210 chbind_packet->data[pos + 1];
212 /* Output the length of the entire response (attrs + header) */
213 *resp_len = rlen + 4;