kopia lustrzana https://github.com/espressif/esp-idf
678 wiersze
19 KiB
C
678 wiersze
19 KiB
C
![]() |
/*
|
||
|
* chap-new.c - New CHAP implementation.
|
||
|
*
|
||
|
* Copyright (c) 2003 Paul Mackerras. All rights reserved.
|
||
|
*
|
||
|
* Redistribution and use in source and binary forms, with or without
|
||
|
* modification, are permitted provided that the following conditions
|
||
|
* are met:
|
||
|
*
|
||
|
* 1. Redistributions of source code must retain the above copyright
|
||
|
* notice, this list of conditions and the following disclaimer.
|
||
|
*
|
||
|
* 2. The name(s) of the authors of this software must not be used to
|
||
|
* endorse or promote products derived from this software without
|
||
|
* prior written permission.
|
||
|
*
|
||
|
* 3. Redistributions of any form whatsoever must retain the following
|
||
|
* acknowledgment:
|
||
|
* "This product includes software developed by Paul Mackerras
|
||
|
* <paulus@samba.org>".
|
||
|
*
|
||
|
* THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
|
||
|
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
|
||
|
* AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
|
||
|
* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
||
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
|
||
|
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
|
||
|
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
||
|
*/
|
||
|
|
||
|
#include "lwip/opt.h"
|
||
|
#if PPP_SUPPORT && CHAP_SUPPORT /* don't build if not configured for use in lwipopts.h */
|
||
|
|
||
|
#if 0 /* UNUSED */
|
||
|
#include <stdlib.h>
|
||
|
#include <string.h>
|
||
|
#endif /* UNUSED */
|
||
|
|
||
|
#include "netif/ppp/ppp_impl.h"
|
||
|
|
||
|
#if 0 /* UNUSED */
|
||
|
#include "session.h"
|
||
|
#endif /* UNUSED */
|
||
|
|
||
|
#include "netif/ppp/chap-new.h"
|
||
|
#include "netif/ppp/chap-md5.h"
|
||
|
#if MSCHAP_SUPPORT
|
||
|
#include "netif/ppp/chap_ms.h"
|
||
|
#endif
|
||
|
#include "netif/ppp/magic.h"
|
||
|
|
||
|
#if 0 /* UNUSED */
|
||
|
/* Hook for a plugin to validate CHAP challenge */
|
||
|
int (*chap_verify_hook)(const char *name, const char *ourname, int id,
|
||
|
const struct chap_digest_type *digest,
|
||
|
const unsigned char *challenge, const unsigned char *response,
|
||
|
char *message, int message_space) = NULL;
|
||
|
#endif /* UNUSED */
|
||
|
|
||
|
#if PPP_OPTIONS
|
||
|
/*
|
||
|
* Command-line options.
|
||
|
*/
|
||
|
static option_t chap_option_list[] = {
|
||
|
{ "chap-restart", o_int, &chap_timeout_time,
|
||
|
"Set timeout for CHAP", OPT_PRIO },
|
||
|
{ "chap-max-challenge", o_int, &pcb->settings.chap_max_transmits,
|
||
|
"Set max #xmits for challenge", OPT_PRIO },
|
||
|
{ "chap-interval", o_int, &pcb->settings.chap_rechallenge_time,
|
||
|
"Set interval for rechallenge", OPT_PRIO },
|
||
|
{ NULL }
|
||
|
};
|
||
|
#endif /* PPP_OPTIONS */
|
||
|
|
||
|
|
||
|
/* Values for flags in chap_client_state and chap_server_state */
|
||
|
#define LOWERUP 1
|
||
|
#define AUTH_STARTED 2
|
||
|
#define AUTH_DONE 4
|
||
|
#define AUTH_FAILED 8
|
||
|
#define TIMEOUT_PENDING 0x10
|
||
|
#define CHALLENGE_VALID 0x20
|
||
|
|
||
|
/*
|
||
|
* Prototypes.
|
||
|
*/
|
||
|
static void chap_init(ppp_pcb *pcb);
|
||
|
static void chap_lowerup(ppp_pcb *pcb);
|
||
|
static void chap_lowerdown(ppp_pcb *pcb);
|
||
|
#if PPP_SERVER
|
||
|
static void chap_timeout(void *arg);
|
||
|
static void chap_generate_challenge(ppp_pcb *pcb);
|
||
|
static void chap_handle_response(ppp_pcb *pcb, int code,
|
||
|
unsigned char *pkt, int len);
|
||
|
static int chap_verify_response(ppp_pcb *pcb, const char *name, const char *ourname, int id,
|
||
|
const struct chap_digest_type *digest,
|
||
|
const unsigned char *challenge, const unsigned char *response,
|
||
|
char *message, int message_space);
|
||
|
#endif /* PPP_SERVER */
|
||
|
static void chap_respond(ppp_pcb *pcb, int id,
|
||
|
unsigned char *pkt, int len);
|
||
|
static void chap_handle_status(ppp_pcb *pcb, int code, int id,
|
||
|
unsigned char *pkt, int len);
|
||
|
static void chap_protrej(ppp_pcb *pcb);
|
||
|
static void chap_input(ppp_pcb *pcb, unsigned char *pkt, int pktlen);
|
||
|
#if PRINTPKT_SUPPORT
|
||
|
static int chap_print_pkt(const unsigned char *p, int plen,
|
||
|
void (*printer) (void *, const char *, ...), void *arg);
|
||
|
#endif /* PRINTPKT_SUPPORT */
|
||
|
|
||
|
/* List of digest types that we know about */
|
||
|
static const struct chap_digest_type* const chap_digests[] = {
|
||
|
&md5_digest,
|
||
|
#if MSCHAP_SUPPORT
|
||
|
&chapms_digest,
|
||
|
&chapms2_digest,
|
||
|
#endif /* MSCHAP_SUPPORT */
|
||
|
NULL
|
||
|
};
|
||
|
|
||
|
/*
|
||
|
* chap_init - reset to initial state.
|
||
|
*/
|
||
|
static void chap_init(ppp_pcb *pcb) {
|
||
|
LWIP_UNUSED_ARG(pcb);
|
||
|
|
||
|
#if 0 /* Not necessary, everything is cleared in ppp_clear() */
|
||
|
memset(&pcb->chap_client, 0, sizeof(chap_client_state));
|
||
|
#if PPP_SERVER
|
||
|
memset(&pcb->chap_server, 0, sizeof(chap_server_state));
|
||
|
#endif /* PPP_SERVER */
|
||
|
#endif /* 0 */
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* chap_lowerup - we can start doing stuff now.
|
||
|
*/
|
||
|
static void chap_lowerup(ppp_pcb *pcb) {
|
||
|
|
||
|
pcb->chap_client.flags |= LOWERUP;
|
||
|
#if PPP_SERVER
|
||
|
pcb->chap_server.flags |= LOWERUP;
|
||
|
if (pcb->chap_server.flags & AUTH_STARTED)
|
||
|
chap_timeout(pcb);
|
||
|
#endif /* PPP_SERVER */
|
||
|
}
|
||
|
|
||
|
static void chap_lowerdown(ppp_pcb *pcb) {
|
||
|
|
||
|
pcb->chap_client.flags = 0;
|
||
|
#if PPP_SERVER
|
||
|
if (pcb->chap_server.flags & TIMEOUT_PENDING)
|
||
|
UNTIMEOUT(chap_timeout, pcb);
|
||
|
pcb->chap_server.flags = 0;
|
||
|
#endif /* PPP_SERVER */
|
||
|
}
|
||
|
|
||
|
#if PPP_SERVER
|
||
|
/*
|
||
|
* chap_auth_peer - Start authenticating the peer.
|
||
|
* If the lower layer is already up, we start sending challenges,
|
||
|
* otherwise we wait for the lower layer to come up.
|
||
|
*/
|
||
|
void chap_auth_peer(ppp_pcb *pcb, const char *our_name, int digest_code) {
|
||
|
const struct chap_digest_type *dp;
|
||
|
int i;
|
||
|
|
||
|
if (pcb->chap_server.flags & AUTH_STARTED) {
|
||
|
ppp_error("CHAP: peer authentication already started!");
|
||
|
return;
|
||
|
}
|
||
|
for (i = 0; (dp = chap_digests[i]) != NULL; ++i)
|
||
|
if (dp->code == digest_code)
|
||
|
break;
|
||
|
if (dp == NULL)
|
||
|
ppp_fatal("CHAP digest 0x%x requested but not available",
|
||
|
digest_code);
|
||
|
|
||
|
pcb->chap_server.digest = dp;
|
||
|
pcb->chap_server.name = our_name;
|
||
|
/* Start with a random ID value */
|
||
|
pcb->chap_server.id = magic();
|
||
|
pcb->chap_server.flags |= AUTH_STARTED;
|
||
|
if (pcb->chap_server.flags & LOWERUP)
|
||
|
chap_timeout(pcb);
|
||
|
}
|
||
|
#endif /* PPP_SERVER */
|
||
|
|
||
|
/*
|
||
|
* chap_auth_with_peer - Prepare to authenticate ourselves to the peer.
|
||
|
* There isn't much to do until we receive a challenge.
|
||
|
*/
|
||
|
void chap_auth_with_peer(ppp_pcb *pcb, const char *our_name, int digest_code) {
|
||
|
const struct chap_digest_type *dp;
|
||
|
int i;
|
||
|
|
||
|
if(NULL == our_name)
|
||
|
return;
|
||
|
|
||
|
if (pcb->chap_client.flags & AUTH_STARTED) {
|
||
|
ppp_error("CHAP: authentication with peer already started!");
|
||
|
return;
|
||
|
}
|
||
|
for (i = 0; (dp = chap_digests[i]) != NULL; ++i)
|
||
|
if (dp->code == digest_code)
|
||
|
break;
|
||
|
|
||
|
if (dp == NULL)
|
||
|
ppp_fatal("CHAP digest 0x%x requested but not available",
|
||
|
digest_code);
|
||
|
|
||
|
pcb->chap_client.digest = dp;
|
||
|
pcb->chap_client.name = our_name;
|
||
|
pcb->chap_client.flags |= AUTH_STARTED;
|
||
|
}
|
||
|
|
||
|
#if PPP_SERVER
|
||
|
/*
|
||
|
* chap_timeout - It's time to send another challenge to the peer.
|
||
|
* This could be either a retransmission of a previous challenge,
|
||
|
* or a new challenge to start re-authentication.
|
||
|
*/
|
||
|
static void chap_timeout(void *arg) {
|
||
|
ppp_pcb *pcb = (ppp_pcb*)arg;
|
||
|
struct pbuf *p;
|
||
|
|
||
|
pcb->chap_server.flags &= ~TIMEOUT_PENDING;
|
||
|
if ((pcb->chap_server.flags & CHALLENGE_VALID) == 0) {
|
||
|
pcb->chap_server.challenge_xmits = 0;
|
||
|
chap_generate_challenge(pcb);
|
||
|
pcb->chap_server.flags |= CHALLENGE_VALID;
|
||
|
} else if (pcb->chap_server.challenge_xmits >= pcb->settings.chap_max_transmits) {
|
||
|
pcb->chap_server.flags &= ~CHALLENGE_VALID;
|
||
|
pcb->chap_server.flags |= AUTH_DONE | AUTH_FAILED;
|
||
|
auth_peer_fail(pcb, PPP_CHAP);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
p = pbuf_alloc(PBUF_RAW, (u16_t)(pcb->chap_server.challenge_pktlen), PPP_CTRL_PBUF_TYPE);
|
||
|
if(NULL == p)
|
||
|
return;
|
||
|
if(p->tot_len != p->len) {
|
||
|
pbuf_free(p);
|
||
|
return;
|
||
|
}
|
||
|
MEMCPY(p->payload, pcb->chap_server.challenge, pcb->chap_server.challenge_pktlen);
|
||
|
ppp_write(pcb, p);
|
||
|
++pcb->chap_server.challenge_xmits;
|
||
|
pcb->chap_server.flags |= TIMEOUT_PENDING;
|
||
|
TIMEOUT(chap_timeout, arg, pcb->settings.chap_timeout_time);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* chap_generate_challenge - generate a challenge string and format
|
||
|
* the challenge packet in pcb->chap_server.challenge_pkt.
|
||
|
*/
|
||
|
static void chap_generate_challenge(ppp_pcb *pcb) {
|
||
|
int clen = 1, nlen, len;
|
||
|
unsigned char *p;
|
||
|
|
||
|
p = pcb->chap_server.challenge;
|
||
|
MAKEHEADER(p, PPP_CHAP);
|
||
|
p += CHAP_HDRLEN;
|
||
|
pcb->chap_server.digest->generate_challenge(pcb, p);
|
||
|
clen = *p;
|
||
|
nlen = strlen(pcb->chap_server.name);
|
||
|
memcpy(p + 1 + clen, pcb->chap_server.name, nlen);
|
||
|
|
||
|
len = CHAP_HDRLEN + 1 + clen + nlen;
|
||
|
pcb->chap_server.challenge_pktlen = PPP_HDRLEN + len;
|
||
|
|
||
|
p = pcb->chap_server.challenge + PPP_HDRLEN;
|
||
|
p[0] = CHAP_CHALLENGE;
|
||
|
p[1] = ++pcb->chap_server.id;
|
||
|
p[2] = len >> 8;
|
||
|
p[3] = len;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* chap_handle_response - check the response to our challenge.
|
||
|
*/
|
||
|
static void chap_handle_response(ppp_pcb *pcb, int id,
|
||
|
unsigned char *pkt, int len) {
|
||
|
int response_len, ok, mlen;
|
||
|
const unsigned char *response;
|
||
|
unsigned char *outp;
|
||
|
struct pbuf *p;
|
||
|
const char *name = NULL; /* initialized to shut gcc up */
|
||
|
#if 0 /* UNUSED */
|
||
|
int (*verifier)(const char *, const char *, int, const struct chap_digest_type *,
|
||
|
const unsigned char *, const unsigned char *, char *, int);
|
||
|
#endif /* UNUSED */
|
||
|
char rname[MAXNAMELEN+1];
|
||
|
char message[256];
|
||
|
|
||
|
if ((pcb->chap_server.flags & LOWERUP) == 0)
|
||
|
return;
|
||
|
if (id != pcb->chap_server.challenge[PPP_HDRLEN+1] || len < 2)
|
||
|
return;
|
||
|
if (pcb->chap_server.flags & CHALLENGE_VALID) {
|
||
|
response = pkt;
|
||
|
GETCHAR(response_len, pkt);
|
||
|
len -= response_len + 1; /* length of name */
|
||
|
name = (char *)pkt + response_len;
|
||
|
if (len < 0)
|
||
|
return;
|
||
|
|
||
|
if (pcb->chap_server.flags & TIMEOUT_PENDING) {
|
||
|
pcb->chap_server.flags &= ~TIMEOUT_PENDING;
|
||
|
UNTIMEOUT(chap_timeout, pcb);
|
||
|
}
|
||
|
#if PPP_REMOTENAME
|
||
|
if (pcb->settings.explicit_remote) {
|
||
|
name = pcb->remote_name;
|
||
|
} else
|
||
|
#endif /* PPP_REMOTENAME */
|
||
|
{
|
||
|
/* Null terminate and clean remote name. */
|
||
|
ppp_slprintf(rname, sizeof(rname), "%.*v", len, name);
|
||
|
name = rname;
|
||
|
}
|
||
|
|
||
|
#if 0 /* UNUSED */
|
||
|
if (chap_verify_hook)
|
||
|
verifier = chap_verify_hook;
|
||
|
else
|
||
|
verifier = chap_verify_response;
|
||
|
ok = (*verifier)(name, pcb->chap_server.name, id, pcb->chap_server.digest,
|
||
|
pcb->chap_server.challenge + PPP_HDRLEN + CHAP_HDRLEN,
|
||
|
response, pcb->chap_server.message, sizeof(pcb->chap_server.message));
|
||
|
#endif /* UNUSED */
|
||
|
ok = chap_verify_response(pcb, name, pcb->chap_server.name, id, pcb->chap_server.digest,
|
||
|
pcb->chap_server.challenge + PPP_HDRLEN + CHAP_HDRLEN,
|
||
|
response, message, sizeof(message));
|
||
|
#if 0 /* UNUSED */
|
||
|
if (!ok || !auth_number()) {
|
||
|
#endif /* UNUSED */
|
||
|
if (!ok) {
|
||
|
pcb->chap_server.flags |= AUTH_FAILED;
|
||
|
ppp_warn("Peer %q failed CHAP authentication", name);
|
||
|
}
|
||
|
} else if ((pcb->chap_server.flags & AUTH_DONE) == 0)
|
||
|
return;
|
||
|
|
||
|
/* send the response */
|
||
|
mlen = strlen(message);
|
||
|
len = CHAP_HDRLEN + mlen;
|
||
|
p = pbuf_alloc(PBUF_RAW, (u16_t)(PPP_HDRLEN +len), PPP_CTRL_PBUF_TYPE);
|
||
|
if(NULL == p)
|
||
|
return;
|
||
|
if(p->tot_len != p->len) {
|
||
|
pbuf_free(p);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
outp = (unsigned char *)p->payload;
|
||
|
MAKEHEADER(outp, PPP_CHAP);
|
||
|
|
||
|
outp[0] = (pcb->chap_server.flags & AUTH_FAILED)? CHAP_FAILURE: CHAP_SUCCESS;
|
||
|
outp[1] = id;
|
||
|
outp[2] = len >> 8;
|
||
|
outp[3] = len;
|
||
|
if (mlen > 0)
|
||
|
memcpy(outp + CHAP_HDRLEN, message, mlen);
|
||
|
ppp_write(pcb, p);
|
||
|
|
||
|
if (pcb->chap_server.flags & CHALLENGE_VALID) {
|
||
|
pcb->chap_server.flags &= ~CHALLENGE_VALID;
|
||
|
if (!(pcb->chap_server.flags & AUTH_DONE) && !(pcb->chap_server.flags & AUTH_FAILED)) {
|
||
|
|
||
|
#if 0 /* UNUSED */
|
||
|
/*
|
||
|
* Auth is OK, so now we need to check session restrictions
|
||
|
* to ensure everything is OK, but only if we used a
|
||
|
* plugin, and only if we're configured to check. This
|
||
|
* allows us to do PAM checks on PPP servers that
|
||
|
* authenticate against ActiveDirectory, and use AD for
|
||
|
* account info (like when using Winbind integrated with
|
||
|
* PAM).
|
||
|
*/
|
||
|
if (session_mgmt &&
|
||
|
session_check(name, NULL, devnam, NULL) == 0) {
|
||
|
pcb->chap_server.flags |= AUTH_FAILED;
|
||
|
ppp_warn("Peer %q failed CHAP Session verification", name);
|
||
|
}
|
||
|
#endif /* UNUSED */
|
||
|
|
||
|
}
|
||
|
if (pcb->chap_server.flags & AUTH_FAILED) {
|
||
|
auth_peer_fail(pcb, PPP_CHAP);
|
||
|
} else {
|
||
|
if ((pcb->chap_server.flags & AUTH_DONE) == 0)
|
||
|
auth_peer_success(pcb, PPP_CHAP,
|
||
|
pcb->chap_server.digest->code,
|
||
|
name, strlen(name));
|
||
|
if (pcb->settings.chap_rechallenge_time) {
|
||
|
pcb->chap_server.flags |= TIMEOUT_PENDING;
|
||
|
TIMEOUT(chap_timeout, pcb,
|
||
|
pcb->settings.chap_rechallenge_time);
|
||
|
}
|
||
|
}
|
||
|
pcb->chap_server.flags |= AUTH_DONE;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* 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 chap_verify_response(ppp_pcb *pcb, const char *name, const char *ourname, int id,
|
||
|
const struct chap_digest_type *digest,
|
||
|
const unsigned char *challenge, const 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(pcb, name, ourname, (char *)secret, &secret_len, 1)) {
|
||
|
ppp_error("No CHAP secret found for authenticating %q", name);
|
||
|
return 0;
|
||
|
}
|
||
|
ok = digest->verify_response(pcb, id, name, secret, secret_len, challenge,
|
||
|
response, message, message_space);
|
||
|
memset(secret, 0, sizeof(secret));
|
||
|
|
||
|
return ok;
|
||
|
}
|
||
|
#endif /* PPP_SERVER */
|
||
|
|
||
|
/*
|
||
|
* chap_respond - Generate and send a response to a challenge.
|
||
|
*/
|
||
|
static void chap_respond(ppp_pcb *pcb, int id,
|
||
|
unsigned char *pkt, int len) {
|
||
|
int clen, nlen;
|
||
|
int secret_len;
|
||
|
struct pbuf *p;
|
||
|
u_char *outp;
|
||
|
char rname[MAXNAMELEN+1];
|
||
|
char secret[MAXSECRETLEN+1];
|
||
|
|
||
|
p = pbuf_alloc(PBUF_RAW, (u16_t)(RESP_MAX_PKTLEN), PPP_CTRL_PBUF_TYPE);
|
||
|
if(NULL == p)
|
||
|
return;
|
||
|
if(p->tot_len != p->len) {
|
||
|
pbuf_free(p);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
if ((pcb->chap_client.flags & (LOWERUP | AUTH_STARTED)) != (LOWERUP | AUTH_STARTED))
|
||
|
return; /* not ready */
|
||
|
if (len < 2 || len < pkt[0] + 1)
|
||
|
return; /* too short */
|
||
|
clen = pkt[0];
|
||
|
nlen = len - (clen + 1);
|
||
|
|
||
|
/* Null terminate and clean remote name. */
|
||
|
ppp_slprintf(rname, sizeof(rname), "%.*v", nlen, pkt + clen + 1);
|
||
|
|
||
|
#if PPP_REMOTENAME
|
||
|
/* Microsoft doesn't send their name back in the PPP packet */
|
||
|
if (pcb->settings.explicit_remote || (pcb->settings.remote_name[0] != 0 && rname[0] == 0))
|
||
|
strlcpy(rname, pcb->settings.remote_name, sizeof(rname));
|
||
|
#endif /* PPP_REMOTENAME */
|
||
|
|
||
|
/* get secret for authenticating ourselves with the specified host */
|
||
|
if (!get_secret(pcb, pcb->chap_client.name, rname, secret, &secret_len, 0)) {
|
||
|
secret_len = 0; /* assume null secret if can't find one */
|
||
|
ppp_warn("No CHAP secret found for authenticating us to %q", rname);
|
||
|
}
|
||
|
|
||
|
outp = (u_char*)p->payload;
|
||
|
MAKEHEADER(outp, PPP_CHAP);
|
||
|
outp += CHAP_HDRLEN;
|
||
|
|
||
|
pcb->chap_client.digest->make_response(pcb, outp, id, pcb->chap_client.name, pkt,
|
||
|
secret, secret_len, pcb->chap_client.priv);
|
||
|
memset(secret, 0, secret_len);
|
||
|
|
||
|
clen = *outp;
|
||
|
nlen = strlen(pcb->chap_client.name);
|
||
|
memcpy(outp + clen + 1, pcb->chap_client.name, nlen);
|
||
|
|
||
|
outp = (u_char*)p->payload + PPP_HDRLEN;
|
||
|
len = CHAP_HDRLEN + clen + 1 + nlen;
|
||
|
outp[0] = CHAP_RESPONSE;
|
||
|
outp[1] = id;
|
||
|
outp[2] = len >> 8;
|
||
|
outp[3] = len;
|
||
|
|
||
|
pbuf_realloc(p, PPP_HDRLEN + len);
|
||
|
ppp_write(pcb, p);
|
||
|
}
|
||
|
|
||
|
static void chap_handle_status(ppp_pcb *pcb, int code, int id,
|
||
|
unsigned char *pkt, int len) {
|
||
|
const char *msg = NULL;
|
||
|
LWIP_UNUSED_ARG(id);
|
||
|
|
||
|
if ((pcb->chap_client.flags & (AUTH_DONE|AUTH_STARTED|LOWERUP))
|
||
|
!= (AUTH_STARTED|LOWERUP))
|
||
|
return;
|
||
|
pcb->chap_client.flags |= AUTH_DONE;
|
||
|
|
||
|
if (code == CHAP_SUCCESS) {
|
||
|
/* used for MS-CHAP v2 mutual auth, yuck */
|
||
|
if (pcb->chap_client.digest->check_success != NULL) {
|
||
|
if (!(*pcb->chap_client.digest->check_success)(pcb, pkt, len, pcb->chap_client.priv))
|
||
|
code = CHAP_FAILURE;
|
||
|
} else
|
||
|
msg = "CHAP authentication succeeded";
|
||
|
} else {
|
||
|
if (pcb->chap_client.digest->handle_failure != NULL)
|
||
|
(*pcb->chap_client.digest->handle_failure)(pcb, pkt, len);
|
||
|
else
|
||
|
msg = "CHAP authentication failed";
|
||
|
}
|
||
|
if (msg) {
|
||
|
if (len > 0)
|
||
|
ppp_info("%s: %.*v", msg, len, pkt);
|
||
|
else
|
||
|
ppp_info("%s", msg);
|
||
|
}
|
||
|
if (code == CHAP_SUCCESS)
|
||
|
auth_withpeer_success(pcb, PPP_CHAP, pcb->chap_client.digest->code);
|
||
|
else {
|
||
|
pcb->chap_client.flags |= AUTH_FAILED;
|
||
|
ppp_error("CHAP authentication failed");
|
||
|
auth_withpeer_fail(pcb, PPP_CHAP);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static void chap_input(ppp_pcb *pcb, unsigned char *pkt, int pktlen) {
|
||
|
unsigned char code, id;
|
||
|
int len;
|
||
|
|
||
|
if (pktlen < CHAP_HDRLEN)
|
||
|
return;
|
||
|
GETCHAR(code, pkt);
|
||
|
GETCHAR(id, pkt);
|
||
|
GETSHORT(len, pkt);
|
||
|
if (len < CHAP_HDRLEN || len > pktlen)
|
||
|
return;
|
||
|
len -= CHAP_HDRLEN;
|
||
|
|
||
|
switch (code) {
|
||
|
case CHAP_CHALLENGE:
|
||
|
chap_respond(pcb, id, pkt, len);
|
||
|
break;
|
||
|
#if PPP_SERVER
|
||
|
case CHAP_RESPONSE:
|
||
|
chap_handle_response(pcb, id, pkt, len);
|
||
|
break;
|
||
|
#endif /* PPP_SERVER */
|
||
|
case CHAP_FAILURE:
|
||
|
case CHAP_SUCCESS:
|
||
|
chap_handle_status(pcb, code, id, pkt, len);
|
||
|
break;
|
||
|
default:
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static void chap_protrej(ppp_pcb *pcb) {
|
||
|
|
||
|
#if PPP_SERVER
|
||
|
if (pcb->chap_server.flags & TIMEOUT_PENDING) {
|
||
|
pcb->chap_server.flags &= ~TIMEOUT_PENDING;
|
||
|
UNTIMEOUT(chap_timeout, pcb);
|
||
|
}
|
||
|
if (pcb->chap_server.flags & AUTH_STARTED) {
|
||
|
pcb->chap_server.flags = 0;
|
||
|
auth_peer_fail(pcb, PPP_CHAP);
|
||
|
}
|
||
|
#endif /* PPP_SERVER */
|
||
|
if ((pcb->chap_client.flags & (AUTH_STARTED|AUTH_DONE)) == AUTH_STARTED) {
|
||
|
pcb->chap_client.flags &= ~AUTH_STARTED;
|
||
|
ppp_error("CHAP authentication failed due to protocol-reject");
|
||
|
auth_withpeer_fail(pcb, PPP_CHAP);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
#if PRINTPKT_SUPPORT
|
||
|
/*
|
||
|
* chap_print_pkt - print the contents of a CHAP packet.
|
||
|
*/
|
||
|
static const char* const chap_code_names[] = {
|
||
|
"Challenge", "Response", "Success", "Failure"
|
||
|
};
|
||
|
|
||
|
static int chap_print_pkt(const unsigned char *p, int plen,
|
||
|
void (*printer) (void *, const char *, ...), void *arg) {
|
||
|
int code, id, len;
|
||
|
int clen, nlen;
|
||
|
unsigned char x;
|
||
|
|
||
|
if (plen < CHAP_HDRLEN)
|
||
|
return 0;
|
||
|
GETCHAR(code, p);
|
||
|
GETCHAR(id, p);
|
||
|
GETSHORT(len, p);
|
||
|
if (len < CHAP_HDRLEN || len > plen)
|
||
|
return 0;
|
||
|
|
||
|
if (code >= 1 && code <= (int)sizeof(chap_code_names) / (int)sizeof(char *))
|
||
|
printer(arg, " %s", chap_code_names[code-1]);
|
||
|
else
|
||
|
printer(arg, " code=0x%x", code);
|
||
|
printer(arg, " id=0x%x", id);
|
||
|
len -= CHAP_HDRLEN;
|
||
|
switch (code) {
|
||
|
case CHAP_CHALLENGE:
|
||
|
case CHAP_RESPONSE:
|
||
|
if (len < 1)
|
||
|
break;
|
||
|
clen = p[0];
|
||
|
if (len < clen + 1)
|
||
|
break;
|
||
|
++p;
|
||
|
nlen = len - clen - 1;
|
||
|
printer(arg, " <");
|
||
|
for (; clen > 0; --clen) {
|
||
|
GETCHAR(x, p);
|
||
|
printer(arg, "%.2x", x);
|
||
|
}
|
||
|
printer(arg, ">, name = ");
|
||
|
ppp_print_string(p, nlen, printer, arg);
|
||
|
break;
|
||
|
case CHAP_FAILURE:
|
||
|
case CHAP_SUCCESS:
|
||
|
printer(arg, " ");
|
||
|
ppp_print_string(p, len, printer, arg);
|
||
|
break;
|
||
|
default:
|
||
|
for (clen = len; clen > 0; --clen) {
|
||
|
GETCHAR(x, p);
|
||
|
printer(arg, " %.2x", x);
|
||
|
}
|
||
|
/* no break */
|
||
|
}
|
||
|
|
||
|
return len + CHAP_HDRLEN;
|
||
|
}
|
||
|
#endif /* PRINTPKT_SUPPORT */
|
||
|
|
||
|
const struct protent chap_protent = {
|
||
|
PPP_CHAP,
|
||
|
chap_init,
|
||
|
chap_input,
|
||
|
chap_protrej,
|
||
|
chap_lowerup,
|
||
|
chap_lowerdown,
|
||
|
NULL, /* open */
|
||
|
NULL, /* close */
|
||
|
#if PRINTPKT_SUPPORT
|
||
|
chap_print_pkt,
|
||
|
#endif /* PRINTPKT_SUPPORT */
|
||
|
#if PPP_DATAINPUT
|
||
|
NULL, /* datainput */
|
||
|
#endif /* PPP_DATAINPUT */
|
||
|
#if PRINTPKT_SUPPORT
|
||
|
"CHAP", /* name */
|
||
|
NULL, /* data_name */
|
||
|
#endif /* PRINTPKT_SUPPORT */
|
||
|
#if PPP_OPTIONS
|
||
|
chap_option_list,
|
||
|
NULL, /* check_options */
|
||
|
#endif /* PPP_OPTIONS */
|
||
|
#if DEMAND_SUPPORT
|
||
|
NULL,
|
||
|
NULL
|
||
|
#endif /* DEMAND_SUPPORT */
|
||
|
};
|
||
|
|
||
|
#endif /* PPP_SUPPORT && CHAP_SUPPORT */
|