1 files changed, 472 insertions, 0 deletions
diff --git a/3rdParty/Ldns/src/src/tsig.c b/3rdParty/Ldns/src/src/tsig.c
new file mode 100644
index 0000000..90c20a0
--- /dev/null
+++ b/3rdParty/Ldns/src/src/tsig.c
@@ -0,0 +1,472 @@
+/*
+ * tsig.c
+ *
+ * contains the functions needed for TSIG [RFC2845]
+ *
+ * (c) 2005-2006 NLnet Labs
+ * See the file LICENSE for the license
+ */
+
+#include <ldns/config.h>
+
+#include <ldns/ldns.h>
+
+#include <strings.h>
+
+#ifdef HAVE_SSL
+#include <openssl/hmac.h>
+#include <openssl/md5.h>
+#endif /* HAVE_SSL */
+
+char *
+ldns_tsig_algorithm(ldns_tsig_credentials *tc)
+{
+	return tc->algorithm;
+}
+
+char *
+ldns_tsig_keyname(ldns_tsig_credentials *tc)
+{
+	return tc->keyname;
+}
+
+char *
+ldns_tsig_keydata(ldns_tsig_credentials *tc)
+{
+	return tc->keydata;
+}
+
+char *
+ldns_tsig_keyname_clone(ldns_tsig_credentials *tc)
+{
+	return strdup(tc->keyname);
+}
+
+char *
+ldns_tsig_keydata_clone(ldns_tsig_credentials *tc)
+{
+	return strdup(tc->keydata);
+}
+
+/*
+ *  Makes an exact copy of the wire, but with the tsig rr removed
+ */
+uint8_t *
+ldns_tsig_prepare_pkt_wire(uint8_t *wire, size_t wire_len, size_t *result_len)
+{
+	uint8_t *wire2 = NULL;
+	uint16_t qd_count;
+	uint16_t an_count;
+	uint16_t ns_count;
+	uint16_t ar_count;
+	ldns_rr *rr;
+
+	size_t pos;
+	uint16_t i;
+
+	ldns_status status;
+
+	if(wire_len < LDNS_HEADER_SIZE) {
+		return NULL;
+	}
+	/* fake parse the wire */
+	qd_count = LDNS_QDCOUNT(wire);
+	an_count = LDNS_ANCOUNT(wire);
+	ns_count = LDNS_NSCOUNT(wire);
+	ar_count = LDNS_ARCOUNT(wire);
+
+	if (ar_count > 0) {
+		ar_count--;
+	} else {
+		return NULL;
+	}
+
+	pos = LDNS_HEADER_SIZE;
+
+	for (i = 0; i < qd_count; i++) {
+		status = ldns_wire2rr(&rr, wire, wire_len, &pos, LDNS_SECTION_QUESTION);
+		if (status != LDNS_STATUS_OK) {
+			return NULL;
+		}
+		ldns_rr_free(rr);
+	}
+
+	for (i = 0; i < an_count; i++) {
+		status = ldns_wire2rr(&rr, wire, wire_len, &pos, LDNS_SECTION_ANSWER);
+		if (status != LDNS_STATUS_OK) {
+			return NULL;
+		}
+		ldns_rr_free(rr);
+	}
+
+	for (i = 0; i < ns_count; i++) {
+		status = ldns_wire2rr(&rr, wire, wire_len, &pos, LDNS_SECTION_AUTHORITY);
+		if (status != LDNS_STATUS_OK) {
+			return NULL;
+		}
+		ldns_rr_free(rr);
+	}
+
+	for (i = 0; i < ar_count; i++) {
+		status = ldns_wire2rr(&rr, wire, wire_len, &pos,
+				LDNS_SECTION_ADDITIONAL);
+		if (status != LDNS_STATUS_OK) {
+			return NULL;
+		}
+		ldns_rr_free(rr);
+	}
+
+	*result_len = pos;
+	wire2 = LDNS_XMALLOC(uint8_t, *result_len);
+	if(!wire2) {
+		return NULL;
+	}
+	memcpy(wire2, wire, *result_len);
+
+	ldns_write_uint16(wire2 + LDNS_ARCOUNT_OFF, ar_count);
+
+	return wire2;
+}
+
+#ifdef HAVE_SSL
+static const EVP_MD *
+ldns_digest_function(char *name)
+{
+	/* these are the mandatory algorithms from RFC4635 */
+	/* The optional algorithms are not yet implemented */
+	if (strlen(name) == 12 
+			&& strncasecmp(name, "hmac-sha256.", 11) == 0) {
+#ifdef HAVE_EVP_SHA256
+		return EVP_sha256();
+#else
+		return NULL;
+#endif
+	} else if (strlen(name) == 10
+			&& strncasecmp(name, "hmac-sha1.", 9) == 0) {
+		return EVP_sha1();
+	} else if (strlen(name) == 25 
+			&& strncasecmp(name, "hmac-md5.sig-alg.reg.int.", 25) 
+			== 0) {
+		return EVP_md5();
+	} else {
+		return NULL;
+	}
+}
+#endif
+
+#ifdef HAVE_SSL
+static ldns_status
+ldns_tsig_mac_new(ldns_rdf **tsig_mac, uint8_t *pkt_wire, size_t pkt_wire_size,
+		const char *key_data, ldns_rdf *key_name_rdf, ldns_rdf *fudge_rdf,
+		ldns_rdf *algorithm_rdf, ldns_rdf *time_signed_rdf, ldns_rdf *error_rdf,
+		ldns_rdf *other_data_rdf, ldns_rdf *orig_mac_rdf, int tsig_timers_only)
+{
+	ldns_status status;
+	char *wireformat;
+	int wiresize;
+	unsigned char *mac_bytes = NULL;
+	unsigned char *key_bytes = NULL;
+	int key_size;
+	const EVP_MD *digester;
+	char *algorithm_name = NULL;
+	unsigned int md_len = EVP_MAX_MD_SIZE;
+	ldns_rdf *result = NULL;
+	ldns_buffer *data_buffer = NULL;
+	ldns_rdf *canonical_key_name_rdf = NULL;
+	ldns_rdf *canonical_algorithm_rdf = NULL;
+	
+	if (key_name_rdf == NULL || algorithm_rdf == NULL) {
+		return LDNS_STATUS_NULL;
+	}
+	canonical_key_name_rdf  = ldns_rdf_clone(key_name_rdf);
+	canonical_algorithm_rdf = ldns_rdf_clone(algorithm_rdf);
+
+	if (canonical_key_name_rdf == NULL 
+			|| canonical_algorithm_rdf  == NULL) {
+		return LDNS_STATUS_MEM_ERR;
+	}
+	/*
+	 * prepare the digestable information
+	 */
+	data_buffer = ldns_buffer_new(LDNS_MAX_PACKETLEN);
+	if (!data_buffer) {
+		status = LDNS_STATUS_MEM_ERR;
+		goto clean;
+	}
+	/* if orig_mac is not NULL, add it too */
+	if (orig_mac_rdf) {
+		(void) ldns_rdf2buffer_wire(data_buffer, orig_mac_rdf);
+ 	}
+	ldns_buffer_write(data_buffer, pkt_wire, pkt_wire_size);
+	if (!tsig_timers_only) {
+		ldns_dname2canonical(canonical_key_name_rdf);
+		(void)ldns_rdf2buffer_wire(data_buffer, 
+				canonical_key_name_rdf);
+		ldns_buffer_write_u16(data_buffer, LDNS_RR_CLASS_ANY);
+		ldns_buffer_write_u32(data_buffer, 0);
+		ldns_dname2canonical(canonical_algorithm_rdf);
+		(void)ldns_rdf2buffer_wire(data_buffer, 
+				canonical_algorithm_rdf);
+	}
+	(void)ldns_rdf2buffer_wire(data_buffer, time_signed_rdf);
+	(void)ldns_rdf2buffer_wire(data_buffer, fudge_rdf);
+	if (!tsig_timers_only) {
+		(void)ldns_rdf2buffer_wire(data_buffer, error_rdf);
+		(void)ldns_rdf2buffer_wire(data_buffer, other_data_rdf);
+	}
+
+	wireformat = (char *) data_buffer->_data;
+	wiresize = (int) ldns_buffer_position(data_buffer);
+
+	algorithm_name = ldns_rdf2str(algorithm_rdf);
+	if(!algorithm_name) {
+		status = LDNS_STATUS_MEM_ERR;
+		goto clean;
+	}
+
+	/* prepare the key */
+	key_bytes = LDNS_XMALLOC(unsigned char,
+			ldns_b64_pton_calculate_size(strlen(key_data)));
+	if(!key_bytes) {
+		status = LDNS_STATUS_MEM_ERR;
+		goto clean;
+	}
+	key_size = ldns_b64_pton(key_data, key_bytes,
+	ldns_b64_pton_calculate_size(strlen(key_data)));
+	if (key_size < 0) {
+		status = LDNS_STATUS_INVALID_B64;
+		goto clean;
+	}
+	/* hmac it */
+	/* 2 spare bytes for the length */
+	mac_bytes = LDNS_XMALLOC(unsigned char, md_len+2);
+	if(!mac_bytes) {
+		status = LDNS_STATUS_MEM_ERR;
+		goto clean;
+	}
+	memset(mac_bytes, 0, md_len+2);
+
+	digester = ldns_digest_function(algorithm_name);
+
+	if (digester) {
+		(void) HMAC(digester, key_bytes, key_size, (void *)wireformat,
+		            (size_t) wiresize, mac_bytes + 2, &md_len);
+
+		ldns_write_uint16(mac_bytes, md_len);
+		result = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_INT16_DATA, md_len + 2,
+				mac_bytes);
+	} else {
+		status = LDNS_STATUS_CRYPTO_UNKNOWN_ALGO;
+		goto clean;
+	}
+	*tsig_mac = result;
+	status = LDNS_STATUS_OK;
+  clean:
+	LDNS_FREE(mac_bytes);
+	LDNS_FREE(key_bytes);
+	LDNS_FREE(algorithm_name);
+	ldns_buffer_free(data_buffer);
+	ldns_rdf_free(canonical_algorithm_rdf);
+	ldns_rdf_free(canonical_key_name_rdf);
+	return status;
+}
+#endif /*  HAVE_SSL */
+
+
+#ifdef HAVE_SSL
+bool
+ldns_pkt_tsig_verify(ldns_pkt *pkt, uint8_t *wire, size_t wirelen, const char *key_name,
+	const char *key_data, ldns_rdf *orig_mac_rdf)
+{
+	return ldns_pkt_tsig_verify_next(pkt, wire, wirelen, key_name, key_data, orig_mac_rdf, 0);
+}
+
+bool
+ldns_pkt_tsig_verify_next(ldns_pkt *pkt, uint8_t *wire, size_t wirelen, const char* key_name,
+	const char *key_data, ldns_rdf *orig_mac_rdf, int tsig_timers_only)
+{
+	ldns_rdf *fudge_rdf;
+	ldns_rdf *algorithm_rdf;
+	ldns_rdf *time_signed_rdf;
+	ldns_rdf *orig_id_rdf;
+	ldns_rdf *error_rdf;
+	ldns_rdf *other_data_rdf;
+	ldns_rdf *pkt_mac_rdf;
+	ldns_rdf *my_mac_rdf;
+	ldns_rdf *key_name_rdf = ldns_rdf_new_frm_str(LDNS_RDF_TYPE_DNAME, key_name);
+	uint16_t pkt_id, orig_pkt_id;
+	ldns_status status;
+
+	uint8_t *prepared_wire = NULL;
+	size_t prepared_wire_size = 0;
+
+	ldns_rr *orig_tsig = ldns_pkt_tsig(pkt);
+
+	if (!orig_tsig || ldns_rr_rd_count(orig_tsig) <= 6) {
+		ldns_rdf_deep_free(key_name_rdf);
+		return false;
+	}
+	algorithm_rdf = ldns_rr_rdf(orig_tsig, 0);
+	time_signed_rdf = ldns_rr_rdf(orig_tsig, 1);
+	fudge_rdf = ldns_rr_rdf(orig_tsig, 2);
+	pkt_mac_rdf = ldns_rr_rdf(orig_tsig, 3);
+	orig_id_rdf = ldns_rr_rdf(orig_tsig, 4);
+	error_rdf = ldns_rr_rdf(orig_tsig, 5);
+	other_data_rdf = ldns_rr_rdf(orig_tsig, 6);
+
+	/* remove temporarily */
+	ldns_pkt_set_tsig(pkt, NULL);
+	/* temporarily change the id to the original id */
+	pkt_id = ldns_pkt_id(pkt);
+	orig_pkt_id = ldns_rdf2native_int16(orig_id_rdf);
+	ldns_pkt_set_id(pkt, orig_pkt_id);
+
+	prepared_wire = ldns_tsig_prepare_pkt_wire(wire, wirelen, &prepared_wire_size);
+
+	status = ldns_tsig_mac_new(&my_mac_rdf, prepared_wire, prepared_wire_size,
+			key_data, key_name_rdf, fudge_rdf, algorithm_rdf,
+			time_signed_rdf, error_rdf, other_data_rdf, orig_mac_rdf, tsig_timers_only);
+
+	LDNS_FREE(prepared_wire);
+
+	if (status != LDNS_STATUS_OK) {
+		ldns_rdf_deep_free(key_name_rdf);
+		return false;
+	}
+	/* Put back the values */
+	ldns_pkt_set_tsig(pkt, orig_tsig);
+	ldns_pkt_set_id(pkt, pkt_id);
+
+	ldns_rdf_deep_free(key_name_rdf);
+
+	if (ldns_rdf_compare(pkt_mac_rdf, my_mac_rdf) == 0) {
+		ldns_rdf_deep_free(my_mac_rdf);
+		return true;
+	} else {
+		ldns_rdf_deep_free(my_mac_rdf);
+		return false;
+	}
+}
+#endif /* HAVE_SSL */
+
+#ifdef HAVE_SSL
+ldns_status
+ldns_pkt_tsig_sign(ldns_pkt *pkt, const char *key_name, const char *key_data,
+	uint16_t fudge, const char *algorithm_name, ldns_rdf *query_mac)
+{
+	return ldns_pkt_tsig_sign_next(pkt, key_name, key_data, fudge, algorithm_name, query_mac, 0);
+}
+
+ldns_status
+ldns_pkt_tsig_sign_next(ldns_pkt *pkt, const char *key_name, const char *key_data,
+	uint16_t fudge, const char *algorithm_name, ldns_rdf *query_mac, int tsig_timers_only)
+{
+	ldns_rr *tsig_rr;
+	ldns_rdf *key_name_rdf = ldns_rdf_new_frm_str(LDNS_RDF_TYPE_DNAME, key_name);
+	ldns_rdf *fudge_rdf = NULL;
+	ldns_rdf *orig_id_rdf = NULL;
+	ldns_rdf *algorithm_rdf;
+	ldns_rdf *error_rdf = NULL;
+	ldns_rdf *mac_rdf = NULL;
+	ldns_rdf *other_data_rdf = NULL;
+
+	ldns_status status = LDNS_STATUS_OK;
+
+	uint8_t *pkt_wire = NULL;
+	size_t pkt_wire_len;
+
+	struct timeval tv_time_signed;
+	uint8_t *time_signed = NULL;
+	ldns_rdf *time_signed_rdf = NULL;
+
+	algorithm_rdf = ldns_rdf_new_frm_str(LDNS_RDF_TYPE_DNAME, algorithm_name);
+	if(!key_name_rdf || !algorithm_rdf) {
+		status = LDNS_STATUS_MEM_ERR;
+		goto clean;
+	}
+
+	/* eww don't have create tsigtime rdf yet :( */
+	/* bleh :p */
+	if (gettimeofday(&tv_time_signed, NULL) == 0) {
+		time_signed = LDNS_XMALLOC(uint8_t, 6);
+		if(!time_signed) {
+			status = LDNS_STATUS_MEM_ERR;
+			goto clean;
+		}
+		ldns_write_uint64_as_uint48(time_signed,
+				(uint64_t)tv_time_signed.tv_sec);
+	} else {
+		status = LDNS_STATUS_INTERNAL_ERR;
+		goto clean;
+	}
+
+	time_signed_rdf = ldns_rdf_new(LDNS_RDF_TYPE_TSIGTIME, 6, time_signed);
+	if(!time_signed_rdf) {
+		LDNS_FREE(time_signed);
+		status = LDNS_STATUS_MEM_ERR;
+		goto clean;
+	}
+
+	fudge_rdf = ldns_native2rdf_int16(LDNS_RDF_TYPE_INT16, fudge);
+
+	orig_id_rdf = ldns_native2rdf_int16(LDNS_RDF_TYPE_INT16, ldns_pkt_id(pkt));
+
+	error_rdf = ldns_native2rdf_int16(LDNS_RDF_TYPE_INT16, 0);
+
+	other_data_rdf = ldns_native2rdf_int16_data(0, NULL);
+
+	if(!fudge_rdf || !orig_id_rdf || !error_rdf || !other_data_rdf) {
+		status = LDNS_STATUS_MEM_ERR;
+		goto clean;
+	}
+
+	if (ldns_pkt2wire(&pkt_wire, pkt, &pkt_wire_len) != LDNS_STATUS_OK) {
+		status = LDNS_STATUS_ERR;
+		goto clean;
+	}
+
+	status = ldns_tsig_mac_new(&mac_rdf, pkt_wire, pkt_wire_len,
+			key_data, key_name_rdf, fudge_rdf, algorithm_rdf,
+			time_signed_rdf, error_rdf, other_data_rdf, query_mac, tsig_timers_only);
+
+	if (!mac_rdf) {
+		goto clean;
+	}
+
+	LDNS_FREE(pkt_wire);
+
+	/* Create the TSIG RR */
+	tsig_rr = ldns_rr_new();
+	if(!tsig_rr) {
+		status = LDNS_STATUS_MEM_ERR;
+		goto clean;
+	}
+	ldns_rr_set_owner(tsig_rr, key_name_rdf);
+	ldns_rr_set_class(tsig_rr, LDNS_RR_CLASS_ANY);
+	ldns_rr_set_type(tsig_rr, LDNS_RR_TYPE_TSIG);
+	ldns_rr_set_ttl(tsig_rr, 0);
+
+	ldns_rr_push_rdf(tsig_rr, algorithm_rdf);
+	ldns_rr_push_rdf(tsig_rr, time_signed_rdf);
+	ldns_rr_push_rdf(tsig_rr, fudge_rdf);
+	ldns_rr_push_rdf(tsig_rr, mac_rdf);
+	ldns_rr_push_rdf(tsig_rr, orig_id_rdf);
+	ldns_rr_push_rdf(tsig_rr, error_rdf);
+	ldns_rr_push_rdf(tsig_rr, other_data_rdf);
+
+	ldns_pkt_set_tsig(pkt, tsig_rr);
+
+	return status;
+
+  clean:
+	LDNS_FREE(pkt_wire);
+	ldns_rdf_free(key_name_rdf);
+	ldns_rdf_free(algorithm_rdf);
+	ldns_rdf_free(time_signed_rdf);
+	ldns_rdf_free(fudge_rdf);
+	ldns_rdf_free(orig_id_rdf);
+	ldns_rdf_free(error_rdf);
+	ldns_rdf_free(other_data_rdf);
+	return status;
+}
+#endif /* HAVE_SSL */