radeapclient.c

RADIUS认证协议

	newvp = paircreate(ATTRIBUTE_EAP_SIM_KEY, PW_TYPE_OCTETS);
	memcpy(newvp->strvalue,    eapsim_mk.K_aut, EAPSIM_AUTH_SIZE);
	newvp->length = EAPSIM_AUTH_SIZE;
	pairreplace(&(rep->vps), newvp);

	return 1;
}

/*
 * this code runs the EAP-SIM client state machine.
 * the *request* is from the server.
 * the *reponse* is to the server.
 *
 */
static int respond_eap_sim(RADIUS_PACKET *req,
			   RADIUS_PACKET *resp)
{
	enum eapsim_clientstates state, newstate;
	enum eapsim_subtype subtype;
	VALUE_PAIR *vp, *statevp, *radstate, *eapid;
	char statenamebuf[32], subtypenamebuf[32];

	if ((radstate = paircopy2(req->vps, PW_STATE)) == NULL)
	{
		return 0;
	}

	if ((eapid = paircopy2(req->vps, ATTRIBUTE_EAP_ID)) == NULL)
	{
		return 0;
	}

	/* first, dig up the state from the request packet, setting
	 * outselves to be in EAP-SIM-Start state if there is none.
	 */

	if((statevp = pairfind(resp->vps, ATTRIBUTE_EAP_SIM_STATE)) == NULL)
	{
		/* must be initial request */
		statevp = paircreate(ATTRIBUTE_EAP_SIM_STATE, PW_TYPE_INTEGER);
		statevp->lvalue = eapsim_client_init;
		pairreplace(&(resp->vps), statevp);
	}
	state = statevp->lvalue;

	/*
	 * map the attributes, and authenticate them.
	 */
	unmap_eapsim_types(req);

	printf("<+++ EAP-sim decoded packet:\n");
	vp_printlist(stdout, req->vps);

	if((vp = pairfind(req->vps, ATTRIBUTE_EAP_SIM_SUBTYPE)) == NULL)
	{
		return 0;
	}
	subtype = vp->lvalue;

	/*
	 * look for the appropriate state, and process incoming message
	 */
	switch(state) {
	case eapsim_client_init:
		switch(subtype) {
		case eapsim_start:
			newstate = process_eap_start(req, resp);
			break;

		case eapsim_challenge:
		case eapsim_notification:
		case eapsim_reauth:
		default:
			fprintf(stderr, "radeapclient: sim in state %s message %s is illegal. Reply dropped.\n",
				sim_state2name(state, statenamebuf, sizeof(statenamebuf)),
				sim_subtype2name(subtype, subtypenamebuf, sizeof(subtypenamebuf)));
			/* invalid state, drop message */
			return 0;
		}
		break;

	case eapsim_client_start:
		switch(subtype) {
		case eapsim_start:
			/* NOT SURE ABOUT THIS ONE, retransmit, I guess */
			newstate = process_eap_start(req, resp);
			break;

		case eapsim_challenge:
			newstate = process_eap_challenge(req, resp);
			break;

		default:
			fprintf(stderr, "radeapclient: sim in state %s message %s is illegal. Reply dropped.\n",
				sim_state2name(state, statenamebuf, sizeof(statenamebuf)),
				sim_subtype2name(subtype, subtypenamebuf, sizeof(subtypenamebuf)));
			/* invalid state, drop message */
			return 0;
		}
		break;


	default:
		fprintf(stderr, "radeapclient: sim in illegal state %s\n",
			sim_state2name(state, statenamebuf, sizeof(statenamebuf)));
		return 0;
	}

	/* copy the eap state object in */
	pairreplace(&(resp->vps), eapid);

	/* update stete info, and send new packet */
	map_eapsim_types(resp);

	/* copy the radius state object in */
	pairreplace(&(resp->vps), radstate);

	statevp->lvalue = newstate;
	return 1;
}

static int respond_eap_md5(RADIUS_PACKET *req,
			   RADIUS_PACKET *rep)
{
	VALUE_PAIR *vp, *id, *state;
	int valuesize, namesize;
	unsigned char identifier;
	unsigned char *value;
	unsigned char *name;
	MD5_CTX	context;
	char    response[16];

	cleanresp(rep);

	if ((state = paircopy2(req->vps, PW_STATE)) == NULL)
	{
		fprintf(stderr, "radeapclient: no state attribute found\n");
		return 0;
	}

	if ((id = paircopy2(req->vps, ATTRIBUTE_EAP_ID)) == NULL)
	{
		fprintf(stderr, "radeapclient: no EAP-ID attribute found\n");
		return 0;
	}
	identifier = id->lvalue;

	if ((vp = pairfind(req->vps, ATTRIBUTE_EAP_BASE+PW_EAP_MD5)) == NULL)
	{
		fprintf(stderr, "radeapclient: no EAP-MD5 attribute found\n");
		return 0;
	}

	/* got the details of the MD5 challenge */
	valuesize = vp->strvalue[0];
	value = &vp->strvalue[1];
	name  = &vp->strvalue[valuesize+1];
	namesize = vp->length - (valuesize + 1);

	/* sanitize items */
	if(valuesize > vp->length)
	{
		fprintf(stderr, "radeapclient: md5 valuesize if too big (%d > %d)\n",
			valuesize, vp->length);
		return 0;
	}

	/* now do the CHAP operation ourself, rather than build the
	 * buffer. We could also call rad_chap_encode, but it wants
	 * a CHAP-Challenge, which we don't want to bother with.
	 */
	librad_MD5Init(&context);
	librad_MD5Update(&context, &identifier, 1);
	librad_MD5Update(&context, password, strlen(password));
	librad_MD5Update(&context, value, valuesize);
	librad_MD5Final(response, &context);

	vp = paircreate(ATTRIBUTE_EAP_BASE+PW_EAP_MD5, PW_TYPE_OCTETS);
	vp->strvalue[0]=16;
	memcpy(&vp->strvalue[1], response, 16);
	vp->length = 17;

	pairreplace(&(rep->vps), vp);

	pairreplace(&(rep->vps), id);

	/* copy the state object in */
	pairreplace(&(rep->vps), state);

	return 1;
}



static int sendrecv_eap(RADIUS_PACKET *rep)
{
	RADIUS_PACKET *req = NULL;
	VALUE_PAIR *vp, *vpnext;
	int tried_eap_md5 = 0;

	/*
	 *	Keep a copy of the the User-Password attribute.
	 */
	if ((vp = pairfind(rep->vps, ATTRIBUTE_EAP_MD5_PASSWORD)) != NULL) {
		strNcpy(password, (char *)vp->strvalue, sizeof(vp->strvalue));

	} else 	if ((vp = pairfind(rep->vps, PW_PASSWORD)) != NULL) {
		strNcpy(password, (char *)vp->strvalue, sizeof(vp->strvalue));
		/*
		 *	Otherwise keep a copy of the CHAP-Password attribute.
		 */
	} else if ((vp = pairfind(rep->vps, PW_CHAP_PASSWORD)) != NULL) {
		strNcpy(password, (char *)vp->strvalue, sizeof(vp->strvalue));
	} else {
		*password = '\0';
	}

 again:
	rep->id++;

	printf("\n+++> About to send encoded packet:\n");
	vp_printlist(stdout, rep->vps);

	/*
	 * if there are EAP types, encode them into an EAP-Message
	 *
	 */
	map_eap_types(rep);

	/*
	 *  Fix up Digest-Attributes issues
	 */
	for (vp = rep->vps; vp != NULL; vp = vp->next) {
		switch (vp->attribute) {
		default:
			break;

		case PW_DIGEST_REALM:
		case PW_DIGEST_NONCE:
		case PW_DIGEST_METHOD:
		case PW_DIGEST_URI:
		case PW_DIGEST_QOP:
		case PW_DIGEST_ALGORITHM:
		case PW_DIGEST_BODY_DIGEST:
		case PW_DIGEST_CNONCE:
		case PW_DIGEST_NONCE_COUNT:
		case PW_DIGEST_USER_NAME:
			/* overlapping! */
			memmove(&vp->strvalue[2], &vp->strvalue[0], vp->length);
			vp->strvalue[0] = vp->attribute - PW_DIGEST_REALM + 1;
			vp->length += 2;
			vp->strvalue[1] = vp->length;
			vp->attribute = PW_DIGEST_ATTRIBUTES;
			break;
		}
	}

	/*
	 *	If we've already sent a packet, free up the old
	 *	one, and ensure that the next packet has a unique
	 *	ID and authentication vector.
	 */
	if (rep->data) {
		free(rep->data);
		rep->data = NULL;
	}

	librad_md5_calc(rep->vector, rep->vector,
			sizeof(rep->vector));

	if (*password != '\0') {
		if ((vp = pairfind(rep->vps, PW_PASSWORD)) != NULL) {
			strNcpy((char *)vp->strvalue, password, strlen(password) + 1);
			vp->length = strlen(password);

		} else if ((vp = pairfind(rep->vps, PW_CHAP_PASSWORD)) != NULL) {
			strNcpy((char *)vp->strvalue, password, strlen(password) + 1);
			vp->length = strlen(password);

			rad_chap_encode(rep, (char *) vp->strvalue, rep->id, vp);
			vp->length = 17;
		}
	} /* there WAS a password */

	/* send the response, wait for the next request */
	send_packet(rep, &req);

	/* okay got back the packet, go and decode the EAP-Message. */
	unmap_eap_types(req);

	printf("<+++ EAP decoded packet:\n");
	vp_printlist(stdout, req->vps);

	/* now look for the code type. */
	for (vp = req->vps; vp != NULL; vp = vpnext) {
		vpnext = vp->next;

		switch (vp->attribute) {
		default:
			break;

		case ATTRIBUTE_EAP_BASE+PW_EAP_MD5:
			if(respond_eap_md5(req, rep) && tried_eap_md5 < 3)
			{
				tried_eap_md5++;
				goto again;
			}
			break;

		case ATTRIBUTE_EAP_BASE+PW_EAP_SIM:
			if(respond_eap_sim(req, rep))
			{
				goto again;
			}
			break;
		}
	}

	return 1;
}


int main(int argc, char **argv)
{
	RADIUS_PACKET *req;
	char *p;
	int c;
	int port = 0;
	char *filename = NULL;
	FILE *fp;
	int count = 1;
	int id;

	id = ((int)getpid() & 0xff);
	librad_debug = 0;

	radlog_dest = RADLOG_STDERR;

	while ((c = getopt(argc, argv, "c:d:f:hi:qst:r:S:xXv")) != EOF)
	{
		switch(c) {
		case 'c':
			if (!isdigit((int) *optarg))
				usage();
			count = atoi(optarg);
			break;
		case 'd':
			radius_dir = optarg;
			break;
		case 'f':
			filename = optarg;
			break;
		case 'q':
			do_output = 0;
			break;
		case 'x':
		        debug_flag++;
			librad_debug++;
			break;

		case 'X':
		  sha1_data_problems = 1;
		  break;



		case 'r':
			if (!isdigit((int) *optarg))
				usage();
			retries = atoi(optarg);
			break;
		case 'i':
			if (!isdigit((int) *optarg))
				usage();
			id = atoi(optarg);
			if ((id < 0) || (id > 255)) {
				usage();
			}
			break;
		case 's':
			do_summary = 1;
			break;
		case 't':
			if (!isdigit((int) *optarg))
				usage();
			timeout = atof(optarg);
			break;
		case 'v':
			printf("radclient: $Id: radeapclient.c,v 1.7 2004/02/26 19:04:29 aland Exp $ built on " __DATE__ " at " __TIME__ "\n");
			exit(0);
			break;
               case 'S':
		       fp = fopen(optarg, "r");
                       if (!fp) {
                               fprintf(stderr, "radclient: Error opening %s: %s\n",
                                       optarg, strerror(errno));
                               exit(1);
                       }
                       if (fgets(filesecret, sizeof(filesecret), fp) == NULL) {
                               fprintf(stderr, "radclient: Error reading %s: %s\n",
                                       optarg, strerror(errno));
                               exit(1);
                       }
		       fclose(fp);

                       /* truncate newline */
		       p = filesecret + strlen(filesecret) - 1;
		       while ((p >= filesecret) &&
			      (*p < ' ')) {
			       *p = '\0';
			       --p;
		       }

                       if (strlen(filesecret) < 2) {
                               fprintf(stderr, "radclient: Secret in %s is too short\n", optarg);
                               exit(1);
                       }
                       secret = filesecret;
		       break;
		case 'h':
		default:
			usage();
			break;
		}
	}
	argc -= (optind - 1);
	argv += (optind - 1);

	if ((argc < 3)  ||
	    ((secret == NULL) && (argc < 4))) {
		usage();
	}

	if (dict_init(radius_dir, RADIUS_DICTIONARY) < 0) {
		librad_perror("radclient");
		return 1;
	}

	if ((req = rad_alloc(1)) == NULL) {
		librad_perror("radclient");
		exit(1);
	}

#if 0
	{
		FILE *randinit;

		if((randinit = fopen("/dev/urandom", "r")) == NULL)
		{
			perror("/dev/urandom");
		} else {
			fread(randctx.randrsl, 256, 1, randinit);
			fclose(randinit);
		}
	}
	lrad_randinit(&randctx, 1);
#endif

	req->id = id;

	/*
	 *	Strip port from hostname if needed.
	 */
	if ((p = strchr(argv[1], ':')) != NULL) {
		*p++ = 0;
		port = atoi(p);
	}

	/*
	 *	See what kind of request we want to send.
	 */
	if (strcmp(argv[2], "auth") == 0) {
		if (port == 0) port = getport("radius");
		if (port == 0) port = PW_AUTH_UDP_PORT;
		req->code = PW_AUTHENTICATION_REQUEST;

	} else if (strcmp(argv[2], "acct") == 0) {
		if (port == 0) port = getport("radacct");
		if (port == 0) port = PW_ACCT_UDP_PORT;
		req->code = PW_ACCOUNTING_REQUEST;
		do_summary = 0;

	} else if (strcmp(argv[2], "status") == 0) {
		if (port == 0) port = getport("radius");
		if (port == 0) port = PW_AUTH_UDP_PORT;
		req->code = PW_STATUS_SERVER;

	} else if (strcmp(argv[2], "disconnect") == 0) {
		if (port == 0) port = PW_POD_UDP_PORT;
		req->code = PW_DISCONNECT_REQUEST;

	} else if (isdigit((int) argv[2][0])) {
		if (port == 0) port = getport("radius");
		if (port == 0) port = PW_AUTH_UDP_PORT;
		req->code = atoi(argv[2]);
	} else {
		usage();
	}

	/*
	 *	Ensure that the configuration is initialized.
	 */
	memset(&mainconfig, 0, sizeof(mainconfig));

	/*
	 *	Resolve hostname.
	 */
	req->dst_port = port;
	req->dst_ipaddr = ip_getaddr(argv[1]);
	if (req->dst_ipaddr == INADDR_NONE) {
		fprintf(stderr, "radclient: Failed to find IP address for host %s\n", argv[1]);
		exit(1);
	}

	/*
	 *	Add the secret.
	 */
	if (argv[3]) secret = argv[3];

	/*
	 *	Read valuepairs.
	 *	Maybe read them, from stdin, if there's no
	 *	filename, or if the filename is '-'.
	 */
	if (filename && (strcmp(filename, "-") != 0)) {
		fp = fopen(filename, "r");
		if (!fp) {
			fprintf(stderr, "radclient: Error opening %s: %s\n",
				filename, strerror(errno));
			exit(1);
		}
	} else {
		fp = stdin;
	}

	/*
	 *	Send request.
	 */
	if ((req->sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
		perror("radclient: socket: ");
		exit(1);
	}

	while(!filedone) {
		if(req->vps) pairfree(&req->vps);

		if ((req->vps = readvp2(fp, &filedone, "radeapclient:"))
		    == NULL) {
			break;
		}

		sendrecv_eap(req);
	}

	if(do_summary) {
		printf("\n\t   Total approved auths:  %d\n", totalapp);
		printf("\t     Total denied auths:  %d\n", totaldeny);
	}
	return 0;
}