t_dst.c

package of develop dns

/*
 * Write a sig in buf to file at path.
 */
static int
sig_tofile(char *path, isc_buffer_t *buf) {
	int		rval;
	int		fd;
	int		len;
	int		nprobs;
	int		cnt;
	unsigned char	c;
	unsigned char	val;

	cnt = 0;
	nprobs = 0;
	len = buf->used - buf->current;

	t_info("buf: current %d used %d len %d\n",
	       buf->current, buf->used, len);

	fd = open(path, O_CREAT|O_TRUNC|O_WRONLY, S_IRWXU|S_IRWXO|S_IRWXG);
	if (fd < 0) {
		t_info("open %s failed %d\n", path, errno);
		return(1);
	}

	while (len) {
		c = (unsigned char) isc_buffer_getuint8(buf);
		val = ((c >> 4 ) & 0x0f);
		if ((0 <= val) && (val <= 9))
			val = '0' + val;
		else
			val = 'A' + val - 10;
		rval = write(fd, &val, 1);
		if (rval != 1) {
			++nprobs;
			t_info("write failed %d %d\n", rval, errno);
			break;
		}
		val = (c & 0x0f);
		if ((0 <= val) && (val <= 9))
			val = '0' + val;
		else
			val = 'A' + val - 10;
		rval = write(fd, &val, 1);
		if (rval != 1) {
			++nprobs;
			t_info("write failed %d %d\n", rval, errno);
			break;
		}
		--len;
		++cnt;
		if ((cnt % 16) == 0) {
			val = '\n';
			rval = write(fd, &val, 1);
			if (rval != 1) {
				++nprobs;
				t_info("write failed %d %d\n", rval, errno);
				break;
			}
		}
	}
	val = '\n';
	rval = write(fd, &val, 1);
	if (rval != 1) {
		++nprobs;
		t_info("write failed %d %d\n", rval, errno);
	}
	(void) close(fd);
	return(nprobs);
}

#endif	/* NEWSIG */

/*
 * Read sig in file at path to buf.
 */
static int
sig_fromfile(char *path, isc_buffer_t *iscbuf) {
	int		rval;
	int		len;
	int		fd;
	unsigned char	val;
	struct stat	sb;
	char		*p;
	char		*buf;

	rval = stat(path, &sb);
	if (rval != 0) {
		t_info("stat %s failed, errno == %d\n", path, errno);
		return(1);
	}

	buf = (char *) malloc((sb.st_size + 1) * sizeof(unsigned char));
	if (buf == NULL) {
		t_info("malloc failed, errno == %d\n", errno);
		return(1);
	}

	fd = open(path, O_RDONLY);
	if (fd < 0) {
		t_info("open failed, errno == %d\n", errno);
		(void) free(buf);
		return(1);
	}

	len = sb.st_size;
	p = buf;
	while (len) {
		rval = read(fd, p, len);
		if (rval > 0) {
			len -= rval;
			p += rval;
		}
		else {
			t_info("read failed %d, errno == %d\n", rval, errno);
			(void) free(buf);
			(void) close(fd);
			return(1);
		}
	}
	close(fd);

	p = buf;
	len = sb.st_size;
	while(len) {
		if (*p == '\n') {
			++p;
			--len;
			continue;
		}
		if (('0' <= *p) && (*p <= '9'))
			val = *p - '0';
		else
			val = *p - 'A' + 10;
		++p;
		val <<= 4;
		--len;
		if (('0' <= *p) && (*p <= '9'))
			val |= (*p - '0');
		else
			val |= (*p - 'A' + 10);
		++p;
		--len;
		isc_buffer_putuint8(iscbuf, val);
	}
	(void) free(buf);
	return(0);
}

static void
t2_sigchk(char *datapath, char *sigpath, char *keyname,
		int id, int alg, int type,
		isc_mem_t *mctx, char *expected_result,
		int *nfails, int *nprobs)
{
	int		rval;
	int		len;
	int		fd;
	int		exp_res;
	dst_key_t	*key = NULL;
	unsigned char	sig[T_SIGMAX];
	unsigned char	*p;
	unsigned char	*data;
	struct stat	sb;
	isc_result_t	isc_result;
	isc_buffer_t	databuf;
	isc_buffer_t	sigbuf;
	isc_region_t	datareg;
	isc_region_t	sigreg;
	dns_fixedname_t	fname;
	dns_name_t	*name;
	isc_buffer_t	b;
	dst_context_t	*ctx = NULL;

	/*
	 * Read data from file in a form usable by dst_verify.
	 */
	rval = stat(datapath, &sb);
	if (rval != 0) {
		t_info("t2_sigchk: stat (%s) failed %d\n", datapath, errno);
		++*nprobs;
		return;
	}

	data = (unsigned char *) malloc(sb.st_size * sizeof(char));
	if (data == NULL) {
		t_info("t2_sigchk: malloc failed %d\n", errno);
		++*nprobs;
		return;
	}

	fd = open(datapath, O_RDONLY);
	if (fd < 0) {
		t_info("t2_sigchk: open failed %d\n", errno);
		(void) free(data);
		++*nprobs;
		return;
	}

	p = data;
	len = sb.st_size;
	do {
		rval = read(fd, p, len);
		if (rval > 0) {
			len -= rval;
			p += rval;
		}
	} while (len);
	(void) close(fd);

	/*
	 * Read key from file in a form usable by dst_verify.
	 */
	dns_fixedname_init(&fname);
	name = dns_fixedname_name(&fname);
	isc_buffer_init(&b, keyname, strlen(keyname));
	isc_buffer_add(&b, strlen(keyname));
	dns_name_fromtext(name, &b, dns_rootname, ISC_FALSE, NULL);
	isc_result = dst_key_fromfile(name, id, alg, type, NULL, mctx, &key);
	if (isc_result != ISC_R_SUCCESS) {
		t_info("dst_key_fromfile failed %s\n",
			isc_result_totext(isc_result));
		(void) free(data);
		++*nprobs;
		return;
	}

	isc_buffer_init(&databuf, data, sb.st_size);
	isc_buffer_add(&databuf, sb.st_size);
	isc_buffer_usedregion(&databuf, &datareg);

#ifdef	NEWSIG

	/*
	 * If we're generating a signature for the first time,
	 * sign the data and save the signature to a file
	 */

	memset(sig, 0, sizeof(sig));
	isc_buffer_init(&sigbuf, sig, sizeof(sig));

	isc_result = dst_context_create(key, mctx, &ctx);
	if (isc_result != ISC_R_SUCCESS) {
		t_info("dst_context_create(%d) failed %s\n",
		       dst_result_totext(isc_result));
		(void) free(data);
		dst_key_free(&key);
		++*nprobs;
		return;
	}
	isc_result = dst_context_adddata(ctx, &datareg);
	if (isc_result != ISC_R_SUCCESS) {
		t_info("dst_context_adddata(%d) failed %s\n",
		       dst_result_totext(isc_result));
		(void) free(data);
		dst_key_free(&key);
		dst_context_destroy(&ctx);
		++*nprobs;
		return;
	}
	isc_result = dst_context_sign(ctx, &sigbuf);
	if (isc_result != ISC_R_SUCCESS) {
		t_info("dst_sign(%d) failed %s\n",
		       dst_result_totext(isc_result));
		(void) free(data);
		dst_key_free(&key);
		dst_context_destroy(&ctx);
		++*nprobs;
		return;
	}
	dst_context_destroy(&ctx);

	rval = sig_tofile(sigpath, &sigbuf);
	if (rval != 0) {
		t_info("sig_tofile failed\n");
		++*nprobs;
		(void) free(data);
		dst_key_free(&key);
		return;
	}

#endif	/* NEWSIG */

	memset(sig, 0, sizeof(sig));
	isc_buffer_init(&sigbuf, sig, sizeof(sig));

	/*
	 * Read precomputed signature from file in a form usable by dst_verify.
	 */
	rval = sig_fromfile(sigpath, &sigbuf);
	if (rval != 0) {
		t_info("sig_fromfile failed\n");
		(void) free(data);
		dst_key_free(&key);
		++*nprobs;
		return;
	}

	/*
	 * Verify that the key signed the data.
	 */
	isc_buffer_remainingregion(&sigbuf, &sigreg);

	exp_res = 0;
	if (strstr(expected_result, "!"))
		exp_res = 1;

	isc_result = dst_context_create(key, mctx, &ctx);
	if (isc_result != ISC_R_SUCCESS) {
		t_info("dst_context_create returned %s\n",
			isc_result_totext(isc_result));
		++*nfails;
	}
	isc_result = dst_context_adddata(ctx, &datareg);
	if (isc_result != ISC_R_SUCCESS) {
		t_info("dst_context_adddata returned %s\n",
			isc_result_totext(isc_result));
		dst_context_destroy(&ctx);
		++*nfails;
	}
	isc_result = dst_context_verify(ctx, &sigreg);
	if (	((exp_res == 0) && (isc_result != ISC_R_SUCCESS))	||
		((exp_res != 0) && (isc_result == ISC_R_SUCCESS)))	{

		t_info("dst_context_verify returned %s, expected %s\n",
			isc_result_totext(isc_result),
			expected_result);
		dst_context_destroy(&ctx);
		++*nfails;
	}

	(void) free(data);
	dst_context_destroy(&ctx);
	dst_key_free(&key);
	return;
}

/*
 * The astute observer will note that t1() signs then verifies data
 * during the test but that t2() verifies data that has been
 * signed at some earlier time, possibly with an entire different
 * version or implementation of the DSA and RSA algorithms
 */
static const char *a2 =
		"the dst module provides the capability to "
		"verify data signed with the RSA and DSA algorithms";

/*
 * av ==  datafile, sigpath, keyname, keyid, alg, exp_result.
 */
static int
t2_vfy(char **av) {
	char		*datapath;
	char		*sigpath;
	char		*keyname;
	char		*key;
	int		keyid;
	char		*alg;
	int		algid;
	char		*exp_result;
	int		nfails;
	int		nprobs;
	isc_mem_t	*mctx;
	isc_entropy_t	*ectx;
	isc_result_t	isc_result;
	int		result;

	datapath	= *av++;
	sigpath		= *av++;
	keyname		= *av++;
	key		= *av++;
	keyid		= atoi(key);
	alg		= *av++;
	exp_result	= *av++;
	nfails		= 0;
	nprobs		= 0;

	if (! strcasecmp(alg, "DST_ALG_DSA"))
		algid = DST_ALG_DSA;
	else if (! strcasecmp(alg, "DST_ALG_RSAMD5"))
		algid = DST_ALG_RSAMD5;
	else {
		t_info("Unknown algorithm %s\n", alg);
		return(T_UNRESOLVED);
	}

	mctx = NULL;
	isc_result = isc_mem_create(0, 0, &mctx);
	if (isc_result != ISC_R_SUCCESS) {
		t_info("isc_mem_create failed %s\n",
		       isc_result_totext(isc_result));
		return(T_UNRESOLVED);
	}
	ectx = NULL;
	isc_result = isc_entropy_create(mctx, &ectx);
	if (isc_result != ISC_R_SUCCESS) {
		t_info("isc_entropy_create failed %s\n",
		       isc_result_totext(isc_result));
		return(T_UNRESOLVED);
	}
	result = isc_entropy_createfilesource(ectx, "randomfile");
	if (isc_result != ISC_R_SUCCESS) {
		t_info("isc_entropy_create failed %s\n",
		       isc_result_totext(isc_result));
		return(T_UNRESOLVED);
	}
	isc_result = dst_lib_init(mctx, ectx, ISC_ENTROPY_BLOCKING);
	if (isc_result != ISC_R_SUCCESS) {
		t_info("dst_lib_init failed %s\n",
		       isc_result_totext(isc_result));
		return(T_UNRESOLVED);
	}

	if (!dst_algorithm_supported(DST_ALG_RSAMD5)) {
		dst_lib_destroy();
		t_info("library built without crypto support\n");
		return (T_UNTESTED);
	}

	t_info("testing %s, %s, %s, %s, %s, %s\n",
			datapath, sigpath, keyname, key, alg, exp_result);
	t2_sigchk(datapath, sigpath, keyname, keyid,
			algid, DST_TYPE_PRIVATE|DST_TYPE_PUBLIC,
			mctx, exp_result,
			&nfails, &nprobs);

	dst_lib_destroy();

	isc_entropy_detach(&ectx);

	isc_mem_destroy(&mctx);

	result = T_UNRESOLVED;
	if (nfails)
		result = T_FAIL;
	else if ((nfails == 0) && (nprobs == 0))
		result = T_PASS;

	return(result);
}

static void
t2(void) {
	int	result;
	t_assert("dst", 2, T_REQUIRED, a2);
	result = t_eval("dst_2_data", t2_vfy, 6);
	t_result(result);
}

testspec_t	T_testlist[] = {
	{	t1,	"basic dst module verification"	},
	{	t2,	"signature ineffability"	},
	{	NULL,	NULL				}
};