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#include <stdlib.h>
#include <string.h>
#include <openssl/md5.h>
#include "log.h"
#include "pwdb.h"
#include "radius.h"
static uint8_t* encrypt_password(const char *passwd, const char *secret, const uint8_t *RA, int *epasswd_len)
{
uint8_t *epasswd;
int i, j, chunk_cnt;
uint8_t b[16], c[16];
MD5_CTX ctx;
chunk_cnt = (strlen(passwd) - 1) / 16 + 1;
epasswd = malloc(chunk_cnt * 16);
if (!epasswd) {
log_emerg("radius: out of memory\n");
return NULL;
}
memset(epasswd, 0, chunk_cnt * 16);
memcpy(epasswd, passwd, strlen(passwd));
memcpy(c, RA, 16);
for (i = 0; i < chunk_cnt; i++) {
MD5_Init(&ctx);
MD5_Update(&ctx, secret, strlen(secret));
MD5_Update(&ctx, c, 16);
MD5_Final(b, &ctx);
for(j = 0; j < 16; j++)
epasswd[i * 16 + j] ^= b[j];
memcpy(c, epasswd + i * 16, 16);
}
*epasswd_len = chunk_cnt * 16;
return epasswd;
}
static int rad_auth_send(struct rad_req_t *req)
{
int i;
for(i = 0; i < conf_max_try; i++) {
if (rad_req_send(req))
goto out;
rad_req_wait(req, conf_timeout);
if (req->reply) {
if (req->reply->id != req->pack->id) {
rad_packet_free(req->reply);
req->reply = NULL;
} else
break;
}
}
if (!req->reply)
log_ppp_warn("radius:auth: no response\n");
else if (req->reply->code == CODE_ACCESS_ACCEPT) {
rad_proc_attrs(req);
return PWDB_SUCCESS;
}
out:
return PWDB_DENIED;
}
int rad_auth_pap(struct radius_pd_t *rpd, const char *username, va_list args)
{
struct rad_req_t *req;
int r = PWDB_DENIED;
//int id = va_arg(args, int);
const char *passwd = va_arg(args, const char *);
uint8_t *epasswd;
int epasswd_len;
req = rad_req_alloc(rpd, CODE_ACCESS_REQUEST, username);
if (!req)
return PWDB_DENIED;
epasswd = encrypt_password(passwd, conf_auth_secret, req->RA, &epasswd_len);
if (!epasswd)
goto out;
if (rad_packet_add_octets(req->pack, "User-Password", epasswd, epasswd_len)) {
free(epasswd);
goto out;
}
free(epasswd);
rad_auth_send(req);
out:
rad_req_free(req);
return r;
}
int rad_auth_chap_md5(struct radius_pd_t *rpd, const char *username, va_list args)
{
struct rad_req_t *req;
int r = PWDB_DENIED;
uint8_t chap_password[17];
int id = va_arg(args, int);
uint8_t *challenge = va_arg(args, uint8_t *);
int challenge_len = va_arg(args, int);
uint8_t *response = va_arg(args, uint8_t *);
chap_password[0] = id;
memcpy(chap_password + 1, response, 16);
req = rad_req_alloc(rpd, CODE_ACCESS_REQUEST, username);
if (!req)
return PWDB_DENIED;
if (challenge_len == 16)
memcpy(req->RA, challenge, 16);
else {
if (rad_packet_add_octets(req->pack, "CHAP-Challenge", challenge, challenge_len))
goto out;
}
if (rad_packet_add_octets(req->pack, "CHAP-Password", chap_password, 17))
goto out;
r = rad_auth_send(req);
out:
rad_req_free(req);
return r;
}
int rad_auth_mschap_v1(struct radius_pd_t *rpd, const char *username, va_list args)
{
int r;
struct rad_req_t *req;
uint8_t response[50];
int id = va_arg(args, int);
const uint8_t *challenge = va_arg(args, const uint8_t *);
int challenge_len = va_arg(args, int);
const uint8_t *lm_response = va_arg(args, const uint8_t *);
const uint8_t *nt_response = va_arg(args, const uint8_t *);
int flags = va_arg(args, int);
req = rad_req_alloc(rpd, CODE_ACCESS_REQUEST, username);
if (!req)
return PWDB_DENIED;
response[0] = id;
response[1] = flags;
memcpy(response + 2, lm_response, 24);
memcpy(response + 2 + 24, nt_response, 24);
if (rad_packet_add_vendor_octets(req->pack, "Microsoft", "MS-CHAP-Challenge", challenge, challenge_len))
goto out;
if (rad_packet_add_vendor_octets(req->pack, "Microsoft", "MS-CHAP-Response", response, sizeof(response)))
goto out;
r = rad_auth_send(req);
out:
rad_req_free(req);
return r;
}
int rad_auth_mschap_v2(struct radius_pd_t *rpd, const char *username, va_list args)
{
int r;
struct rad_req_t *req;
struct rad_attr_t *ra;
uint8_t mschap_response[50];
int id = va_arg(args, int);
const uint8_t *challenge = va_arg(args, const uint8_t *);
const uint8_t *peer_challenge = va_arg(args, const uint8_t *);
const uint8_t *reserved = va_arg(args, const uint8_t *);
const uint8_t *response = va_arg(args, const uint8_t *);
int flags = va_arg(args, int);
uint8_t *authenticator = va_arg(args, uint8_t *);
req = rad_req_alloc(rpd, CODE_ACCESS_REQUEST, username);
if (!req)
return PWDB_DENIED;
mschap_response[0] = id;
mschap_response[1] = flags;
memcpy(mschap_response + 2, peer_challenge, 16);
memcpy(mschap_response + 2 + 16, reserved, 8);
memcpy(mschap_response + 2 + 16 + 8, response, 24);
if (rad_packet_add_vendor_octets(req->pack, "Microsoft", "MS-CHAP-Challenge", challenge, 16))
goto out;
if (rad_packet_add_vendor_octets(req->pack, "Microsoft", "MS-CHAP2-Response", mschap_response, sizeof(mschap_response)))
goto out;
r = rad_auth_send(req);
if (r == PWDB_SUCCESS) {
ra = rad_packet_find_vendor_attr(req->reply, "Microsoft", "MS-CHAP2-Success");
if (!ra) {
log_error("radius:auth:mschap-v2: 'MS-CHAP-Success' not found in radius response\n");
r = PWDB_DENIED;
} else
memcpy(authenticator, ra->val.octets + 3, 40);
}
out:
rad_req_free(req);
return r;
}
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