Adding upstream version 2.7.6.upstream/2.7.6upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 352 insertions, 0 deletions

diff --git a/src/utils/keymgr/bind_privkey.c b/src/utils/keymgr/bind_privkey.c
new file mode 100644
index 0000000..7e140e4
--- /dev/null
+++ b/src/utils/keymgr/bind_privkey.c
@@ -0,0 +1,352 @@
+/*  Copyright (C) 2018 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <string.h>
+
+#include "contrib/ctype.h"
+#include "contrib/strtonum.h"
+#include "libdnssec/binary.h"
+#include "libdnssec/error.h"
+#include "libdnssec/shared/pem.h"
+#include "libdnssec/shared/shared.h"
+#include "utils/keymgr/bind_privkey.h"
+
+/* -- private key params conversion ---------------------------------------- */
+
+/*!
+ * Private key attribute conversion.
+ */
+typedef struct param_t {
+	char *name;
+	size_t offset;
+	int (*parse_cb)(char *string, void *data);
+	void (*free_cb)(void *data);
+} param_t;
+
+static int parse_algorithm(char *string, void *_algorithm);
+static int parse_binary(char *string, void *_binary);
+static int parse_time(char *string, void *_time);
+
+static void binary_free(void *_binary)
+{
+	dnssec_binary_t *binary = _binary;
+	dnssec_binary_free(binary);
+}
+
+/*!
+ * Know attributes in private key file.
+ */
+const param_t PRIVKEY_CONVERSION_TABLE[] = {
+	#define o(field) offsetof(bind_privkey_t, field)
+	{ "Algorithm",       o(algorithm),        parse_algorithm, NULL },
+	{ "Modulus",         o(modulus),          parse_binary,    binary_free },
+	{ "PublicExponent",  o(public_exponent),  parse_binary,    binary_free },
+	{ "PrivateExponent", o(private_exponent), parse_binary,    binary_free },
+	{ "Prime1",          o(prime_one),        parse_binary,    binary_free },
+	{ "Prime2",          o(prime_two),        parse_binary,    binary_free },
+	{ "Exponent1",       o(exponent_one),     parse_binary,    binary_free },
+	{ "Exponent2",       o(exponent_two),     parse_binary,    binary_free },
+	{ "Coefficient",     o(coefficient),      parse_binary,    binary_free },
+	{ "PrivateKey",      o(private_key),      parse_binary,    binary_free },
+	{ "Created",         o(time_created),     parse_time,      NULL },
+	{ "Publish",         o(time_publish),     parse_time,      NULL },
+	{ "Activate",        o(time_activate),    parse_time,      NULL },
+	{ "Revoke",          o(time_revoke),      parse_time,      NULL },
+	{ "Inactive",        o(time_inactive),    parse_time,      NULL },
+	{ "Delete",          o(time_delete),      parse_time,      NULL },
+	{ NULL }
+	#undef o
+};
+
+/* -- attribute parsing ---------------------------------------------------- */
+
+/*!
+ * Parse key algorithm field.
+ *
+ * Example: 7 (NSEC3RSASHA1)
+ *
+ * Only the numeric value is decoded, the rest of the value is ignored.
+ */
+static int parse_algorithm(char *string, void *_algorithm)
+{
+	char *end = string;
+	while (*end != '\0' && !is_space(*end)) {
+		end += 1;
+	}
+	*end = '\0';
+
+	uint8_t *algorithm = _algorithm;
+	int r = str_to_u8(string, algorithm);
+
+	return (r == KNOT_EOK ? DNSSEC_EOK : DNSSEC_INVALID_KEY_ALGORITHM);
+}
+
+/*!
+ * Parse binary data encoded in Base64.
+ *
+ * Example: AQAB
+ */
+static int parse_binary(char *string, void *_binary)
+{
+	dnssec_binary_t base64 = {
+		.data = (uint8_t *)string,
+		.size = strlen(string)
+	};
+
+	dnssec_binary_t *binary = _binary;
+	return dnssec_binary_from_base64(&base64, binary);
+}
+
+#define LEGACY_DATE_FORMAT "%Y%m%d%H%M%S"
+
+/*!
+ * Parse timestamp in a format in \ref LEGACY_DATE_FORMAT.
+ *
+ * Example: 20140415151855
+ */
+static int parse_time(char *string, void *_time)
+{
+	struct tm tm = { 0 };
+
+	char *end = strptime(string, LEGACY_DATE_FORMAT, &tm);
+	if (end == NULL || *end != '\0') {
+		return DNSSEC_MALFORMED_DATA;
+	}
+
+	time_t *time = _time;
+	*time = timegm(&tm);
+
+	return DNSSEC_EOK;
+}
+
+/* -- key parsing ---------------------------------------------------------- */
+
+/*!
+ * Strip string value of left and right whitespaces.
+ *
+ * \param[in,out] value   Start of the string.
+ * \param[in,out] length  Length of the string.
+ *
+ */
+static void strip(char **value, size_t *length)
+{
+	// strip from left
+	while (*length > 0 && is_space(**value)) {
+		*value += 1;
+		*length -= 1;
+	}
+	// strip from right
+	while (*length > 0 && is_space((*value)[*length - 1])) {
+		*length -= 1;
+	}
+}
+
+/*!
+ * Parse one line of the private key file.
+ */
+static int parse_line(bind_privkey_t *params, char *line, size_t length)
+{
+	assert(params);
+	assert(line);
+
+	char *separator = memchr(line, ':', length);
+	if (!separator) {
+		return DNSSEC_MALFORMED_DATA;
+	}
+
+	char *key = line;
+	size_t key_length = separator - key;
+	strip(&key, &key_length);
+
+	char *value = separator + 1;
+	size_t value_length = (line + length) - value;
+	strip(&value, &value_length);
+
+	if (key_length == 0 || value_length == 0) {
+		return DNSSEC_MALFORMED_DATA;
+	}
+
+	key[key_length] = '\0';
+	value[value_length] = '\0';
+
+	for (const param_t *p = PRIVKEY_CONVERSION_TABLE; p->name != NULL; p++) {
+		size_t name_length = strlen(p->name);
+		if (name_length != key_length) {
+			continue;
+		}
+
+		if (strcasecmp(p->name, key) != 0) {
+			continue;
+		}
+
+		return p->parse_cb(value, (void *)params + p->offset);
+	}
+
+	// ignore unknown attributes
+
+	return DNSSEC_EOK;
+}
+
+int bind_privkey_parse(const char *filename, bind_privkey_t *params_ptr)
+{
+	_cleanup_fclose_ FILE *file = fopen(filename, "r");
+	if (!file) {
+		return DNSSEC_NOT_FOUND;
+	}
+
+	bind_privkey_t params = { 0 };
+
+	_cleanup_free_ char *line = NULL;
+	size_t size = 0;
+	ssize_t read = 0;
+	while ((read = getline(&line, &size, file)) != -1) {
+		int r = parse_line(&params, line, read);
+		if (r != DNSSEC_EOK) {
+			bind_privkey_free(&params);
+			return r;
+		}
+	}
+
+	*params_ptr = params;
+
+	return DNSSEC_EOK;
+}
+
+/* -- freeing -------------------------------------------------------------- */
+
+/*!
+ * Free private key parameters.
+ */
+void bind_privkey_free(bind_privkey_t *params)
+{
+	if (!params) {
+		return;
+	}
+
+	for (const param_t *p = PRIVKEY_CONVERSION_TABLE; p->name != NULL; p++) {
+		if (p->free_cb) {
+			p->free_cb((void *)params + p->offset);
+		}
+	}
+
+	clear_struct(params);
+}
+
+/* -- export to PEM -------------------------------------------------------- */
+
+static int rsa_params_to_pem(const bind_privkey_t *params, dnssec_binary_t *pem)
+{
+	_cleanup_x509_privkey_ gnutls_x509_privkey_t key = NULL;
+	int result = gnutls_x509_privkey_init(&key);
+	if (result != GNUTLS_E_SUCCESS) {
+		return DNSSEC_ENOMEM;
+	}
+
+	gnutls_datum_t m = binary_to_datum(&params->modulus);
+	gnutls_datum_t e = binary_to_datum(&params->public_exponent);
+	gnutls_datum_t d = binary_to_datum(&params->private_exponent);
+	gnutls_datum_t p = binary_to_datum(&params->prime_one);
+	gnutls_datum_t q = binary_to_datum(&params->prime_two);
+	gnutls_datum_t u = binary_to_datum(&params->coefficient);
+
+	result = gnutls_x509_privkey_import_rsa_raw(key, &m, &e, &d, &p, &q, &u);
+	if (result != GNUTLS_E_SUCCESS) {
+		return DNSSEC_KEY_IMPORT_ERROR;
+	}
+
+	return pem_from_x509(key, pem);
+}
+
+/*!
+ * \see lib/key/convert.h
+ */
+static gnutls_ecc_curve_t choose_ecdsa_curve(size_t pubkey_size)
+{
+	switch (pubkey_size) {
+	case 64: return GNUTLS_ECC_CURVE_SECP256R1;
+	case 96: return GNUTLS_ECC_CURVE_SECP384R1;
+	default: return GNUTLS_ECC_CURVE_INVALID;
+	}
+}
+
+static void ecdsa_extract_public_params(dnssec_key_t *key, gnutls_ecc_curve_t *curve,
+					gnutls_datum_t *x, gnutls_datum_t *y)
+{
+	dnssec_binary_t pubkey = { 0 };
+	dnssec_key_get_pubkey(key, &pubkey);
+
+	*curve = choose_ecdsa_curve(pubkey.size);
+
+	size_t param_size = pubkey.size / 2;
+	x->data = pubkey.data;
+	x->size = param_size;
+	y->data = pubkey.data + param_size;
+	y->size = param_size;
+}
+
+static int ecdsa_params_to_pem(dnssec_key_t *dnskey, const bind_privkey_t *params,
+			       dnssec_binary_t *pem)
+{
+	_cleanup_x509_privkey_ gnutls_x509_privkey_t key = NULL;
+	int result = gnutls_x509_privkey_init(&key);
+	if (result != GNUTLS_E_SUCCESS) {
+		return DNSSEC_ENOMEM;
+	}
+
+	gnutls_ecc_curve_t curve = 0;
+	gnutls_datum_t x = { 0 };
+	gnutls_datum_t y = { 0 };
+	ecdsa_extract_public_params(dnskey, &curve, &x, &y);
+
+	gnutls_datum_t k = binary_to_datum(&params->private_key);
+
+	result = gnutls_x509_privkey_import_ecc_raw(key, curve, &x, &y, &k);
+	if (result != DNSSEC_EOK) {
+		return DNSSEC_KEY_IMPORT_ERROR;
+	}
+
+	gnutls_x509_privkey_fix(key);
+
+	return pem_from_x509(key, pem);
+}
+
+int bind_privkey_to_pem(dnssec_key_t *key, bind_privkey_t *params, dnssec_binary_t *pem)
+{
+	dnssec_key_algorithm_t algorithm = dnssec_key_get_algorithm(key);
+	switch (algorithm) {
+	case DNSSEC_KEY_ALGORITHM_RSA_SHA1:
+	case DNSSEC_KEY_ALGORITHM_RSA_SHA1_NSEC3:
+	case DNSSEC_KEY_ALGORITHM_RSA_SHA256:
+	case DNSSEC_KEY_ALGORITHM_RSA_SHA512:
+		return rsa_params_to_pem(params, pem);
+	case DNSSEC_KEY_ALGORITHM_ECDSA_P256_SHA256:
+	case DNSSEC_KEY_ALGORITHM_ECDSA_P384_SHA384:
+		return ecdsa_params_to_pem(key, params, pem);
+	default:
+		return DNSSEC_INVALID_KEY_ALGORITHM;
+	}
+}
+
+void bind_privkey_to_timing(bind_privkey_t *params, knot_kasp_key_timing_t *timing)
+{
+	// unsupported: time_created, time_revoke
+
+	timing->publish = (knot_time_t)params->time_publish;
+	timing->ready   = 0;
+	timing->active  = (knot_time_t)params->time_activate;
+	timing->retire  = (knot_time_t)params->time_inactive;
+	timing->remove  = (knot_time_t)params->time_delete;
+}