* Implemented EAP-TLS authentication
*/
-/*
- * TODO:
- */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
#include <stdio.h>
#include <stdlib.h>
#include "pathnames.h"
#include "md5.h"
#include "eap.h"
+#ifdef USE_PEAP
+#include "peap.h"
+#endif /* USE_PEAP */
#ifdef USE_SRP
+#ifdef HAVE_TIME_H
+#include <time.h>
+#endif
#include <t_pwd.h>
#include <t_server.h>
#include <t_client.h>
#include "eap-tls.h"
#endif /* USE_EAPTLS */
+#ifdef CHAPMS
+#include "chap_ms.h"
+#include "chap-new.h"
+
+extern int chapms_strip_domain;
+#endif /* CHAPMS */
+
eap_state eap_states[NUM_PPP]; /* EAP state; one for each unit */
#ifdef USE_SRP
static char *pn_secret = NULL; /* Pseudonym generating secret */
#ifdef USE_EAPTLS
esp->es_client.ea_using_eaptls = 0;
#endif /* USE_EAPTLS */
+#ifdef CHAPMS
+ esp->es_client.digest = chap_find_digest(CHAP_MICROSOFT_V2);
+ esp->es_server.digest = chap_find_digest(CHAP_MICROSOFT_V2);
+#endif
}
/*
tpw.pebuf.name = esp->es_server.ea_peer;
tpw.pebuf.password.len = t_fromb64((char *)tpw.pwbuf,
cp);
- tpw.pebuf.password.data = tpw.pwbuf;
+ tpw.pebuf.password.data = (char*) tpw.pwbuf;
tpw.pebuf.salt.len = t_fromb64((char *)tpw.saltbuf,
cp2);
tpw.pebuf.salt.data = tpw.saltbuf;
}
break;
+#ifdef CHAPMS
+ case eapMSCHAPv2Chall:
+#endif
case eapMD5Chall:
if (status != 0) {
esp->es_server.ea_state = eapBadAuth;
#endif /* USE_EAPTLS */
}
+#if CHAPMS
+/*
+ * eap_chap_verify_response - check whether the peer's response matches
+ * what we think it should be. Returns 1 if it does (authentication
+ * succeeded), or 0 if it doesn't.
+ */
+static int
+eap_chap_verify_response(char *name, char *ourname, int id,
+ struct chap_digest_type *digest,
+ unsigned char *challenge, unsigned char *response,
+ char *message, int message_space)
+{
+ int ok;
+ unsigned char secret[MAXSECRETLEN];
+ int secret_len;
+
+ /* Get the secret that the peer is supposed to know */
+ if (!get_secret(0, name, ourname, (char *)secret, &secret_len, 1)) {
+ error("No CHAP secret found for authenticating %q", name);
+ return 0;
+ }
+
+ ok = digest->verify_response(id, name, secret, secret_len, challenge,
+ response, message, message_space);
+ memset(secret, 0, sizeof(secret));
+
+ return ok;
+}
+
+/*
+ * Format and send an CHAPV2-Success/Failure EAP Request message.
+ */
+static void
+eap_chapms2_send_request(eap_state *esp, u_char id,
+ u_char opcode, u_char chapid,
+ char *message, int message_len)
+{
+ u_char *outp;
+ int msglen;
+
+ outp = outpacket_buf;
+
+ MAKEHEADER(outp, PPP_EAP);
+
+ msglen = EAP_HEADERLEN + 5 * sizeof (u_char);
+ msglen += message_len;
+
+ PUTCHAR(EAP_REQUEST, outp);
+ PUTCHAR(id, outp);
+ PUTSHORT(msglen, outp);
+ PUTCHAR(EAPT_MSCHAPV2, outp);
+ PUTCHAR(opcode, outp);
+ PUTCHAR(chapid, outp);
+ /* MS len */
+ PUTSHORT(msglen - 5, outp);
+ BCOPY(message, outp, message_len);
+
+ output(esp->es_unit, outpacket_buf, PPP_HDRLEN + msglen);
+
+ if (opcode == CHAP_SUCCESS) {
+ auth_peer_success(esp->es_unit, PPP_EAP, 0,
+ esp->es_server.ea_peer, esp->es_server.ea_peerlen);
+ }
+ else {
+ esp->es_server.ea_state = eapBadAuth;
+ auth_peer_fail(esp->es_unit, PPP_EAP);
+ }
+}
+#endif /* CHAPMS */
+
/*
* Format an EAP Request message and send it to the peer. Message
* type depends on current state. (Server operation)
INCPTR(esp->es_server.ea_namelen, outp);
break;
+#ifdef CHAPMS
+ case eapMSCHAPv2Chall:
+ esp->es_server.digest->generate_challenge(esp->es_challenge);
+ challen = esp->es_challenge[0];
+ esp->es_challen = challen;
+
+ PUTCHAR(EAPT_MSCHAPV2, outp);
+ PUTCHAR(CHAP_CHALLENGE, outp);
+ PUTCHAR(esp->es_server.ea_id, outp);
+ /* MS len */
+ PUTSHORT(5 + challen +
+ esp->es_server.ea_namelen,
+ outp);
+ /* challen + challenge */
+ BCOPY(esp->es_challenge, outp, challen+1);
+ INCPTR(challen+1, outp);
+ BCOPY(esp->es_server.ea_name,
+ outp,
+ esp->es_server.ea_namelen);
+ INCPTR(esp->es_server.ea_namelen, outp);
+ break;
+#endif /* CHAPMS */
+
#ifdef USE_EAPTLS
case eapTlsStart:
PUTCHAR(EAPT_TLS, outp);
}
#endif /* USE_SRP */
+#if CHAPMS
+/*
+ * Format and send an CHAPV2-Challenge EAP Response message.
+ */
+static void
+eap_chapv2_response(eap_state *esp, u_char id, u_char chapid, u_char *response, char *user, int user_len)
+{
+ u_char *outp;
+ int msglen;
+
+ outp = outpacket_buf;
+
+ MAKEHEADER(outp, PPP_EAP);
+
+ PUTCHAR(EAP_RESPONSE, outp);
+ PUTCHAR(id, outp);
+ esp->es_client.ea_id = id;
+ msglen = EAP_HEADERLEN + 6 * sizeof (u_char) + MS_CHAP2_RESPONSE_LEN + user_len;
+ PUTSHORT(msglen, outp);
+ PUTCHAR(EAPT_MSCHAPV2, outp);
+ PUTCHAR(CHAP_RESPONSE, outp);
+ PUTCHAR(chapid, outp);
+ PUTCHAR(0, outp);
+ /* len */
+ PUTCHAR(5 + user_len + MS_CHAP2_RESPONSE_LEN, outp);
+ BCOPY(response, outp, MS_CHAP2_RESPONSE_LEN+1); // VLEN + VALUE
+ INCPTR(MS_CHAP2_RESPONSE_LEN+1, outp);
+ BCOPY(user, outp, user_len);
+
+ output(esp->es_unit, outpacket_buf, PPP_HDRLEN + msglen);
+}
+#endif
+
/*
* eap_request - Receive EAP Request message (client mode).
*/
/* Init ssl session */
if(!eaptls_init_ssl_client(esp)) {
dbglog("cannot init ssl");
- eap_send_nak(esp, id, EAPT_TLS);
+ eap_send_nak(esp, id, EAPT_MSCHAPV2);
esp->es_client.ea_using_eaptls = 0;
break;
}
}
/* The server has sent a bad start packet. */
- eap_send_nak(esp, id, EAPT_TLS);
+ eap_send_nak(esp, id, EAPT_MSCHAPV2);
break;
case eapTlsRecvAck:
break;
default:
- eap_send_nak(esp, id, EAPT_TLS);
+ eap_send_nak(esp, id, EAPT_MSCHAPV2);
esp->es_client.ea_using_eaptls = 0;
break;
}
}
break;
#endif /* USE_SRP */
+
+#ifdef CHAPMS
+ case EAPT_MSCHAPV2:
+ if (len < 4) {
+ error("EAP: received invalid MSCHAPv2 packet, too short");
+ return;
+ }
+ unsigned char opcode;
+ GETCHAR(opcode, inp);
+ unsigned char chapid; /* Chapv2-ID */
+ GETCHAR(chapid, inp);
+ short mssize;
+ GETSHORT(mssize, inp);
+
+ /* Validate the mssize field */
+ if (len != mssize) {
+ error("EAP: received invalid MSCHAPv2 packet, invalid length");
+ return;
+ }
+ len -= 4;
+
+ /* If MSCHAPv2 digest was not found, NAK the packet */
+ if (!esp->es_client.digest) {
+ error("EAP MSCHAPv2 not supported");
+ eap_send_nak(esp, id, EAPT_SRP);
+ return;
+ }
+
+ switch (opcode) {
+ case CHAP_CHALLENGE: {
+
+ /* make_response() expects: VLEN + VALUE */
+ u_char *challenge = inp;
+
+ unsigned char vsize;
+ GETCHAR(vsize, inp);
+ len -= 1;
+
+ /* Validate the VALUE field */
+ if (vsize != MS_CHAP2_PEER_CHAL_LEN || len < MS_CHAP2_PEER_CHAL_LEN) {
+ error("EAP: received invalid MSCHAPv2 packet, invalid value-length: %d", vsize);
+ return;
+ }
+
+ /* Increment past the VALUE field */
+ INCPTR(MS_CHAP2_PEER_CHAL_LEN, inp);
+ len -= MS_CHAP2_PEER_CHAL_LEN;
+
+ /* Extract the hostname */
+ rhostname[0] = '\0';
+ if (len > 0) {
+ if (len >= sizeof (rhostname)) {
+ dbglog("EAP: trimming really long peer name down");
+ len = sizeof(rhostname) - 1;
+ }
+ BCOPY(inp, rhostname, len);
+ rhostname[len] = '\0';
+ }
+
+ /* In case the remote doesn't give us his name. */
+ if (explicit_remote || (remote_name[0] != '\0' && len == 0))
+ strlcpy(rhostname, remote_name, sizeof(rhostname));
+
+ /* Get the secret for authenticating ourselves with the specified host. */
+ if (!get_secret(esp->es_unit, esp->es_client.ea_name,
+ rhostname, secret, &secret_len, 0)) {
+ dbglog("EAP: no CHAP secret for auth to %q", rhostname);
+ eap_send_nak(esp, id, EAPT_SRP);
+ break;
+ }
+ esp->es_client.ea_namelen = strlen(esp->es_client.ea_name);
+
+ /* Create the MSCHAPv2 response (and add to cache) */
+ unsigned char response[MS_CHAP2_RESPONSE_LEN+1]; // VLEN + VALUE
+ esp->es_client.digest->make_response(response, chapid, esp->es_client.ea_name,
+ challenge, secret, secret_len, NULL);
+
+ eap_chapv2_response(esp, id, chapid, response, esp->es_client.ea_name, esp->es_client.ea_namelen);
+ break;
+ }
+ case CHAP_SUCCESS: {
+
+ /* Check response for mutual authentication */
+ u_char status = CHAP_FAILURE;
+ if (esp->es_client.digest->check_success(chapid, inp, len) == 1) {
+ info("Chap authentication succeeded! %.*v", len, inp);
+ status = CHAP_SUCCESS;
+ }
+ eap_send_response(esp, id, EAPT_MSCHAPV2, &status, sizeof(status));
+ break;
+ }
+ case CHAP_FAILURE: {
+
+ /* Process the failure string, and log appropriate information */
+ esp->es_client.digest->handle_failure(inp, len);
+
+ u_char status = CHAP_FAILURE;
+ eap_send_response(esp, id, EAPT_MSCHAPV2, &status, sizeof(status));
+ goto client_failure; /* force termination */
+ }
+ default:
+
+ error("EAP: received invalid MSCHAPv2 packet, invalid or unsupported opcode: %d", opcode);
+ eap_send_nak(esp, id, EAPT_SRP);
+ }
+
+ break;
+#endif /* CHAPMS */
+#ifdef USE_PEAP
+ case EAPT_PEAP:
+
+ /* Initialize the PEAP context (if not already initialized) */
+ if (!esp->ea_peap) {
+ rhostname[0] = '\0';
+ if (explicit_remote || (remote_name[0] != '\0')) {
+ strlcpy(rhostname, remote_name, sizeof (rhostname));
+ }
+ if (peap_init(&esp->ea_peap, rhostname)) {
+ eap_send_nak(esp, id, EAPT_TLS);
+ break;
+ }
+ }
+
+ /* Process the PEAP packet */
+ if (peap_process(esp, id, inp, len)) {
+ eap_send_nak(esp, id, EAPT_TLS);
+ }
+
+ break;
+#endif /* USE_PEAP */
default:
info("EAP: unknown authentication type %d; Naking", typenum);
}
return;
-#ifdef USE_SRP
client_failure:
esp->es_client.ea_state = eapBadAuth;
if (esp->es_client.ea_timeout > 0) {
UNTIMEOUT(eap_client_timeout, (void *)esp);
}
esp->es_client.ea_session = NULL;
+#ifdef USE_SRP
t_clientclose(tc);
auth_withpeer_fail(esp->es_unit, PPP_EAP);
#endif /* USE_SRP */
struct t_num A;
SHA1_CTX ctxt;
u_char dig[SHA_DIGESTSIZE];
- SHA1_CTX ctxt;
- u_char dig[SHA_DIGESTSIZE];
#endif /* USE_SRP */
#ifdef USE_EAPTLS
struct eaptls_session *ets;
u_char flags;
#endif /* USE_EAPTLS */
+#ifdef CHAPMS
+ u_char opcode;
+ int (*chap_verifier)(char *, char *, int, struct chap_digest_type *,
+ unsigned char *, unsigned char *, char *, int);
+ char response_message[256];
+#endif /* CHAPMS */
/*
* Ignore responses if we're not open
break;
#endif /* USE_EAPTLS */
+#ifdef CHAPMS
+ case EAPT_MSCHAPV2:
+ info("EAP: peer proposes MSCHAPv2");
+ /* If MSCHAPv2 digest was not found, NAK the packet */
+ if (!esp->es_server.digest) {
+ error("EAP MSCHAPv2 not supported");
+ eap_send_nak(esp, id, EAPT_SRP);
+ break;
+ }
+ esp->es_server.ea_state = eapMSCHAPv2Chall;
+ break;
+#endif /* CHAPMS */
+
default:
dbglog("EAP: peer requesting unknown Type %d", vallen);
switch (esp->es_server.ea_state) {
TIMEOUT(eap_rechallenge, esp, esp->es_rechallenge);
break;
+#ifdef CHAPMS
+ case EAPT_MSCHAPV2:
+ if (len < 1) {
+ error("EAP: received MSCHAPv2 with no data");
+ eap_figure_next_state(esp, 1);
+ break;
+ }
+ GETCHAR(opcode, inp);
+ len--;
+
+ switch (opcode) {
+ case CHAP_RESPONSE:
+ if (esp->es_server.ea_state != eapMSCHAPv2Chall) {
+ error("EAP: unexpected MSCHAPv2-Response");
+ eap_figure_next_state(esp, 1);
+ break;
+ }
+ /* skip MS ID + len */
+ INCPTR(3, inp);
+ GETCHAR(vallen, inp);
+ len -= 4;
+
+ if (vallen != MS_CHAP2_RESPONSE_LEN || vallen > len) {
+ error("EAP: Invalid MSCHAPv2-Response "
+ "length %d", vallen);
+ eap_figure_next_state(esp, 1);
+ break;
+ }
+
+ /* Not so likely to happen. */
+ if (len - vallen >= sizeof (rhostname)) {
+ dbglog("EAP: trimming really long peer name down");
+ BCOPY(inp + vallen, rhostname, sizeof (rhostname) - 1);
+ rhostname[sizeof (rhostname) - 1] = '\0';
+ } else {
+ BCOPY(inp + vallen, rhostname, len - vallen);
+ rhostname[len - vallen] = '\0';
+ }
+
+ /* In case the remote doesn't give us his name. */
+ if (explicit_remote ||
+ (remote_name[0] != '\0' && vallen == len))
+ strlcpy(rhostname, remote_name, sizeof (rhostname));
+
+ /* strip the MS domain name */
+ if (chapms_strip_domain && strrchr(rhostname, '\\')) {
+ char tmp[MAXNAMELEN+1];
+
+ strcpy(tmp, strrchr(rhostname, '\\') + 1);
+ strcpy(rhostname, tmp);
+ }
+
+ if (chap_verify_hook)
+ chap_verifier = chap_verify_hook;
+ else
+ chap_verifier = eap_chap_verify_response;
+
+ esp->es_server.ea_id += 1;
+ if ((*chap_verifier)(rhostname,
+ esp->es_server.ea_name,
+ id,
+ esp->es_server.digest,
+ esp->es_challenge,
+ inp - 1,
+ response_message,
+ sizeof(response_message)))
+ {
+ info("EAP: MSCHAPv2 success for peer %q",
+ rhostname);
+ esp->es_server.ea_type = EAPT_MSCHAPV2;
+ eap_chapms2_send_request(esp,
+ esp->es_server.ea_id,
+ CHAP_SUCCESS,
+ esp->es_server.ea_id,
+ response_message,
+ strlen(response_message));
+ eap_figure_next_state(esp, 0);
+ if (esp->es_rechallenge != 0)
+ TIMEOUT(eap_rechallenge, esp, esp->es_rechallenge);
+ }
+ else {
+ warn("EAP: MSCHAPv2 failure for peer %q",
+ rhostname);
+ eap_chapms2_send_request(esp,
+ esp->es_server.ea_id,
+ CHAP_FAILURE,
+ esp->es_server.ea_id,
+ response_message,
+ strlen(response_message));
+ }
+ break;
+ case CHAP_SUCCESS:
+ info("EAP: MSCHAPv2 success confirmed");
+ break;
+ case CHAP_FAILURE:
+ info("EAP: MSCHAPv2 failure confirmed");
+ break;
+ default:
+ error("EAP: Unhandled MSCHAPv2 opcode %d", opcode);
+ eap_send_nak(esp, id, EAPT_SRP);
+ }
+
+ break;
+#endif /* CHAPMS */
+
#ifdef USE_SRP
case EAPT_SRP:
if (len < 1) {
PRINTMSG(inp, len);
}
+#ifdef USE_PEAP
+ peap_finish(&esp->ea_peap);
+#endif
+
esp->es_client.ea_state = eapOpen;
auth_withpeer_success(esp->es_unit, PPP_EAP, 0);
}
esp->es_client.ea_state = eapBadAuth;
error("EAP: peer reports authentication failure");
+
+#ifdef USE_PEAP
+ peap_finish(&esp->ea_peap);
+#endif
+
auth_withpeer_fail(esp->es_unit, PPP_EAP);
}
"OTP", "Generic-Token", NULL, NULL,
"RSA", "DSS", "KEA", "KEA-Validate",
"TLS", "Defender", "Windows 2000", "Arcot",
- "Cisco", "Nokia", "SRP"
+ "Cisco", "Nokia", "SRP", NULL,
+ "TTLS", "RAS", "AKA", "3COM", "PEAP",
+ "MSCHAPv2"
};
static int
#ifdef USE_EAPTLS
u_char flags;
#endif /* USE_EAPTLS */
+#ifdef CHAPMS
+ u_char opcode;
+#endif /* CHAPMS */
if (inlen < EAP_HEADERLEN)
return (0);
}
break;
+#ifdef CHAPMS
+ case EAPT_MSCHAPV2:
+ if (len <= 0)
+ break;
+ GETCHAR(opcode, inp);
+ len--;
+ switch (opcode) {
+ case CHAP_CHALLENGE:
+ INCPTR(3, inp);
+ len -= 3;
+ GETCHAR(vallen, inp);
+ len--;
+ if (vallen > len)
+ goto truncated;
+ len -= vallen;
+ printer(arg, " Challenge <");
+ for (; vallen > 0; --vallen) {
+ u_char val;
+ GETCHAR(val, inp);
+ printer(arg, "%.2x", val);
+ }
+ printer(arg, ">");
+ if (len > 0) {
+ printer(arg, ", <Name ");
+ print_string((char *)inp, len, printer, arg);
+ printer(arg, ">");
+ INCPTR(len, inp);
+ len = 0;
+ } else {
+ printer(arg, ", <No name>");
+ }
+ break;
+ case CHAP_SUCCESS:
+ INCPTR(3, inp);
+ len -= 3;
+ printer(arg, " Success <Message ");
+ print_string((char *)inp, len, printer, arg);
+ printer(arg, ">");
+ break;
+ case CHAP_FAILURE:
+ INCPTR(3, inp);
+ len -= 3;
+ printer(arg, " Failure <Message ");
+ print_string((char *)inp, len, printer, arg);
+ printer(arg, ">");
+ break;
+ default:
+ INCPTR(3, inp);
+ len -= 3;
+ printer(arg, " opcode=0x%x <%.*B>", opcode, len, inp);
+ break;
+ }
+ break;
+#endif /* CHAPMS */
+
#ifdef USE_EAPTLS
case EAPT_TLS:
if (len < 1)
break;
#endif /* USE_EAPTLS */
+#ifdef USE_SRP
case EAPT_SRP:
if (len < 3)
goto truncated;
break;
}
break;
+#endif /* USE_SRP */
}
break;
len--;
printer(arg, " <Suggested-type %02X", rtype);
if (rtype >= 1 &&
- rtype < sizeof (eap_typenames) / sizeof (char *))
+ rtype <= sizeof (eap_typenames) / sizeof (char *))
printer(arg, " (%s)", eap_typenames[rtype-1]);
printer(arg, ">");
break;
}
break;
+#ifdef CHAPMS
+ case EAPT_MSCHAPV2:
+ if (len <= 0)
+ break;
+ GETCHAR(opcode, inp);
+ len--;
+ switch (opcode) {
+ case CHAP_RESPONSE:
+ INCPTR(3, inp);
+ len -= 3;
+ GETCHAR(vallen, inp);
+ len--;
+ if (vallen > len)
+ goto truncated;
+ len -= vallen;
+ printer(arg, " Response <");
+ for (; vallen > 0; --vallen) {
+ u_char val;
+ GETCHAR(val, inp);
+ printer(arg, "%.2x", val);
+ }
+ printer(arg, ">");
+ if (len > 0) {
+ printer(arg, ", <Name ");
+ print_string((char *)inp, len, printer, arg);
+ printer(arg, ">");
+ INCPTR(len, inp);
+ len = 0;
+ } else {
+ printer(arg, ", <No name>");
+ }
+ break;
+ case CHAP_SUCCESS:
+ printer(arg, " Success");
+ break;
+ case CHAP_FAILURE:
+ printer(arg, " Failure");
+ break;
+ default:
+ printer(arg, " opcode=0x%x <%.*B>", opcode, len, inp);
+ break;
+ }
+ break;
+#endif /* CHAPMS */
+
+#ifdef USE_SRP
case EAPT_SRP:
if (len < 1)
goto truncated;
break;
}
break;
+#endif /* USE_SRP */
}
break;
projects / ppp.git / blobdiff