*
* radius.c
*
-* RADIUS plugin for pppd. Performs PAP, CHAP and MS-CHAP authentication
-* using RADIUS.
+* RADIUS plugin for pppd. Performs PAP, CHAP, MS-CHAP, MS-CHAPv2
+* authentication using RADIUS.
*
* Copyright (C) 2002 Roaring Penguin Software Inc.
*
* Copyright (C) 1995,1996,1997,1998 Lars Fenneberg <lf@elemental.net>
* Copyright (C) 2002 Roaring Penguin Software Inc.
*
+* MPPE support is by Ralf Hofmann, <ralf.hofmann@elvido.net>, with
+* modification from Frank Cusack, <frank@google.com>.
+*
* This plugin may be distributed according to the terms of the GNU
* General Public License, version 2 or (at your option) any later version.
*
***********************************************************************/
static char const RCSID[] =
-"$Id: radius.c,v 1.5 2002/03/04 14:59:51 dfs Exp $";
+"$Id: radius.c,v 1.11 2002/07/15 11:04:18 kad Exp $";
#include "pppd.h"
#include "chap.h"
#ifdef CHAPMS
#include "chap_ms.h"
+#ifdef MPPE
+#include "md5.h"
+#endif
#endif
#include "radiusclient.h"
#include "fsm.h"
static void radius_ip_up(void *opaque, int arg);
static void radius_ip_down(void *opaque, int arg);
static void make_username_realm(char *user);
-static int radius_setparams(VALUE_PAIR *vp, char *msg);
+static int radius_setparams(chap_state *cstate, VALUE_PAIR *vp, char *msg,
+ REQUEST_INFO *req_info);
static void radius_choose_ip(u_int32_t *addrp);
static int radius_init(char *msg);
static int get_client_port(char *ifname);
static int radius_allowed_address(u_int32_t addr);
+#ifdef MPPE
+static int radius_setmppekeys(VALUE_PAIR *vp, REQUEST_INFO *req_info,
+ chap_state *);
+static int radius_setmppekeys2(VALUE_PAIR *vp, REQUEST_INFO *req_info);
+#endif
#ifndef MAXSESSIONID
#define MAXSESSIONID 32
if (rstate.authserver) {
result = rc_auth_using_server(rstate.authserver,
rstate.client_port, send,
- &received, radius_msg);
+ &received, radius_msg, NULL);
} else {
- result = rc_auth(rstate.client_port, send, &received, radius_msg);
+ result = rc_auth(rstate.client_port, send, &received, radius_msg, NULL);
}
if (result == OK_RC) {
- if (radius_setparams(received, radius_msg) < 0) {
+ if (radius_setparams(NULL, received, radius_msg, NULL) < 0) {
result = ERROR_RC;
}
}
* %RETURNS:
* CHAP_SUCCESS if we can authenticate, CHAP_FAILURE if we cannot.
* %DESCRIPTION:
-* Performs CHAP and MS-CHAP authentication using RADIUS
+* Performs CHAP, MS-CHAP and MS-CHAPv2 authentication using RADIUS.
***********************************************************************/
static int
radius_chap_auth(char *user,
static char radius_msg[BUF_LEN];
int result;
u_char cpassword[MAX_RESPONSE_LENGTH + 1];
+#ifdef MPPE
+ /* Need the RADIUS secret and Request Authenticator to decode MPPE */
+ REQUEST_INFO request_info, *req_info = &request_info;
+#else
+ REQUEST_INFO *req_info = NULL;
+#endif
+
radius_msg[0] = 0;
if (radius_init(radius_msg) < 0) {
if ((cstate->chal_type != CHAP_DIGEST_MD5)
#ifdef CHAPMS
&& (cstate->chal_type != CHAP_MICROSOFT)
+ && (cstate->chal_type != CHAP_MICROSOFT_V2)
#endif
) {
error("RADIUS: Challenge type %u unsupported", cstate->chal_type);
case CHAP_MICROSOFT:
{
/* MS-CHAP-Challenge and MS-CHAP-Response */
- MS_ChapResponse *rmd = remmd;
+ MS_ChapResponse *rmd = (MS_ChapResponse *) remmd;
u_char *p = cpassword;
*p++ = cstate->chal_id;
cpassword, MS_CHAP_RESPONSE_LEN + 1, VENDOR_MICROSOFT);
break;
}
+
+ case CHAP_MICROSOFT_V2:
+ {
+ /* MS-CHAP-Challenge and MS-CHAP2-Response */
+ MS_Chap2Response *rmd = (MS_Chap2Response *) remmd;
+ u_char *p = cpassword;
+
+ *p++ = cstate->chal_id;
+ /* The idiots use a different field order in RADIUS than PPP */
+ memcpy(p, rmd->Flags, sizeof(rmd->Flags));
+ p += sizeof(rmd->Flags);
+ memcpy(p, rmd->PeerChallenge, sizeof(rmd->PeerChallenge));
+ p += sizeof(rmd->PeerChallenge);
+ memcpy(p, rmd->Reserved, sizeof(rmd->Reserved));
+ p += sizeof(rmd->Reserved);
+ memcpy(p, rmd->NTResp, sizeof(rmd->NTResp));
+
+ rc_avpair_add(&send, PW_MS_CHAP_CHALLENGE,
+ cstate->challenge, cstate->chal_len, VENDOR_MICROSOFT);
+ rc_avpair_add(&send, PW_MS_CHAP2_RESPONSE,
+ cpassword, MS_CHAP2_RESPONSE_LEN + 1, VENDOR_MICROSOFT);
+ break;
+ }
#endif
}
if (rstate.authserver) {
result = rc_auth_using_server(rstate.authserver,
rstate.client_port, send,
- &received, radius_msg);
+ &received, radius_msg, req_info);
} else {
- result = rc_auth(rstate.client_port, send, &received, radius_msg);
+ result = rc_auth(rstate.client_port, send, &received, radius_msg,
+ req_info);
}
if (result == OK_RC) {
if (!rstate.done_chap_once) {
- if (radius_setparams(received, radius_msg) < 0) {
+ if (radius_setparams(cstate, received, radius_msg, req_info) < 0) {
error("%s", radius_msg);
result = ERROR_RC;
} else {
/**********************************************************************
* %FUNCTION: radius_setparams
* %ARGUMENTS:
+* cstate -- pppd's chap_state structure
* vp -- received value-pairs
* msg -- buffer in which to place error message. Holds up to BUF_LEN chars
* %RETURNS:
* >= 0 on success; -1 on failure
* %DESCRIPTION:
-* Parses attributes sent by RADIUS server and sets them in pppd. Currently,
-* used only to set IP address.
+* Parses attributes sent by RADIUS server and sets them in pppd.
***********************************************************************/
static int
-radius_setparams(VALUE_PAIR *vp, char *msg)
+radius_setparams(chap_state *cstate, VALUE_PAIR *vp, char *msg,
+ REQUEST_INFO *req_info)
{
u_int32_t remote;
+ int ms_chap2_success = 0;
/* Send RADIUS attributes to anyone else who might be interested */
if (radius_attributes_hook) {
return -1;
}
break;
+
case PW_FRAMED_PROTOCOL:
/* check for framed protocol type */
/* if not PPP then also exit */
}
break;
+ case PW_SESSION_TIMEOUT:
+ /* Session timeout */
+ maxconnect = vp->lvalue;
+ break;
+#ifdef MAXOCTETS
+ case PW_SESSION_OCTETS_LIMIT:
+ /* Session traffic limit */
+ maxoctets = vp->lvalue;
+ break;
+ case PW_OCTETS_DIRECTION:
+ /* Session traffic limit direction check */
+ maxoctets_dir = ( vp->lvalue > 4 ) 0 : vp->lvalue ;
+ break;
+#endif
case PW_FRAMED_IP_ADDRESS:
/* seting up remote IP addresses */
remote = vp->lvalue;
rstate.choose_ip = 1;
rstate.ip_addr = remote;
}
- break;
+ break;
}
+#ifdef CHAPMS
+ } else if (vp->vendorcode == VENDOR_MICROSOFT) {
+ switch (vp->attribute) {
+ case PW_MS_CHAP2_SUCCESS:
+ if ((vp->lvalue != 43) || strncmp(vp->strvalue + 1, "S=", 2)) {
+ slprintf(msg,BUF_LEN,"RADIUS: bad MS-CHAP2-Success packet");
+ return -1;
+ }
+ memcpy(cstate->saresponse, vp->strvalue + 3,
+ MS_AUTH_RESPONSE_LENGTH);
+ cstate->saresponse[MS_AUTH_RESPONSE_LENGTH] = '\0';
+ ms_chap2_success = 1;
+ break;
+
+#ifdef MPPE
+ case PW_MS_CHAP_MPPE_KEYS:
+ if (radius_setmppekeys(vp, req_info, cstate) < 0) {
+ slprintf(msg, BUF_LEN,
+ "RADIUS: bad MS-CHAP-MPPE-Keys attribute");
+ return -1;
+ }
+ break;
+
+ case PW_MS_MPPE_SEND_KEY:
+ case PW_MS_MPPE_RECV_KEY:
+ if (radius_setmppekeys2(vp, req_info) < 0) {
+ slprintf(msg, BUF_LEN,
+ "RADIUS: bad MS-MPPE-%s-Key attribute",
+ (vp->attribute == PW_MS_MPPE_SEND_KEY)?
+ "Send": "Recv");
+ return -1;
+ }
+ break;
+#endif /* MPPE */
+#if 0
+ case PW_MS_MPPE_ENCRYPTION_POLICY:
+ case PW_MS_MPPE_ENCRYPTION_TYPES:
+ case PW_MS_PRIMARY_DNS_SERVER:
+ case PW_MS_SECONDARY_DNS_SERVER:
+ case PW_MS_PRIMARY_NBNS_SERVER:
+ case PW_MS_SECONDARY_NBNS_SERVER:
+ break;
+#endif
+ }
+#endif /* CHAPMS */
}
vp = vp->next;
}
+
+ /* Require a valid MS-CHAP2-SUCCESS for MS-CHAPv2 auth */
+ if (cstate && (cstate->chal_type == CHAP_MICROSOFT_V2) && !ms_chap2_success)
+ return -1;
+
+ return 0;
+}
+
+#ifdef MPPE
+/**********************************************************************
+* %FUNCTION: radius_setmppekeys
+* %ARGUMENTS:
+* vp -- value pair holding MS-CHAP-MPPE-KEYS attribute
+* req_info -- radius request information used for encryption
+* cstate -- chap_state structure for challenge info
+* %RETURNS:
+* >= 0 on success; -1 on failure
+* %DESCRIPTION:
+* Decrypt the "key" provided by the RADIUS server for MPPE encryption.
+* See RFC 2548.
+***********************************************************************/
+static int
+radius_setmppekeys(VALUE_PAIR *vp, REQUEST_INFO *req_info, chap_state *cstate)
+{
+ int i;
+ MD5_CTX Context;
+ u_char plain[32];
+ u_char buf[16];
+
+ if (vp->lvalue != 32) {
+ error("RADIUS: Incorrect attribute length (%d) for MS-CHAP-MPPE-Keys",
+ vp->lvalue);
+ return -1;
+ }
+
+ memcpy(plain, vp->strvalue, sizeof(plain));
+
+ MD5Init(&Context);
+ MD5Update(&Context, req_info->secret, strlen(req_info->secret));
+ MD5Update(&Context, req_info->request_vector, AUTH_VECTOR_LEN);
+ MD5Final(buf, &Context);
+
+ for (i = 0; i < 16; i++)
+ plain[i] ^= buf[i];
+
+ MD5Init(&Context);
+ MD5Update(&Context, req_info->secret, strlen(req_info->secret));
+ MD5Update(&Context, vp->strvalue, 16);
+ MD5Final(buf, &Context);
+
+ for(i = 0; i < 16; i++)
+ plain[i + 16] ^= buf[i];
+
+ /*
+ * Annoying. The "key" returned is just the NTPasswordHashHash, which
+ * the NAS (us) doesn't need; we only need the start key. So we have
+ * to generate the start key, sigh. NB: We do not support the LM-Key.
+ */
+ mppe_set_keys(cstate->challenge, &plain[8]);
+
+ return 0;
+}
+
+/**********************************************************************
+* %FUNCTION: radius_setmppekeys2
+* %ARGUMENTS:
+* vp -- value pair holding MS-MPPE-SEND-KEY or MS-MPPE-RECV-KEY attribute
+* req_info -- radius request information used for encryption
+* %RETURNS:
+* >= 0 on success; -1 on failure
+* %DESCRIPTION:
+* Decrypt the key provided by the RADIUS server for MPPE encryption.
+* See RFC 2548.
+***********************************************************************/
+static int
+radius_setmppekeys2(VALUE_PAIR *vp, REQUEST_INFO *req_info)
+{
+ int i;
+ MD5_CTX Context;
+ u_char *salt = vp->strvalue;
+ u_char *crypt = vp->strvalue + 2;
+ u_char plain[32];
+ u_char buf[MD5_SIGNATURE_SIZE];
+ char *type = "Send";
+
+ if (vp->attribute == PW_MS_MPPE_RECV_KEY)
+ type = "Recv";
+
+ if (vp->lvalue != 34) {
+ error("RADIUS: Incorrect attribute length (%d) for MS-MPPE-%s-Key",
+ vp->lvalue, type);
+ return -1;
+ }
+
+ if ((salt[0] & 0x80) == 0) {
+ error("RADIUS: Illegal salt value for MS-MPPE-%s-Key attribute", type);
+ return -1;
+ }
+
+ memcpy(plain, crypt, 32);
+
+ MD5Init(&Context);
+ MD5Update(&Context, req_info->secret, strlen(req_info->secret));
+ MD5Update(&Context, req_info->request_vector, AUTH_VECTOR_LEN);
+ MD5Update(&Context, salt, 2);
+ MD5Final(buf, &Context);
+
+ for (i = 0; i < 16; i++)
+ plain[i] ^= buf[i];
+
+ if (plain[0] != sizeof(mppe_send_key) /* 16 */) {
+ error("RADIUS: Incorrect key length (%d) for MS-MPPE-%s-Key attribute",
+ (int) plain[0], type);
+ return -1;
+ }
+
+ MD5Init(&Context);
+ MD5Update(&Context, req_info->secret, strlen(req_info->secret));
+ MD5Update(&Context, crypt, 16);
+ MD5Final(buf, &Context);
+
+ plain[16] ^= buf[0]; /* only need the first byte */
+
+ if (vp->attribute == PW_MS_MPPE_SEND_KEY)
+ memcpy(mppe_send_key, plain + 1, 16);
+ else
+ memcpy(mppe_recv_key, plain + 1, 16);
+
return 0;
}
+#endif /* MPPE */
/**********************************************************************
* %FUNCTION: radius_acct_start
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