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jws.c
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jws.c
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/**
*
* Rhonabwy JSON Web Signature (JWS) library
*
* jws.c: functions definitions
*
* Copyright 2020-2021 Nicolas Mora <mail@babelouest.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library 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 library. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <string.h>
#include <ctype.h>
#include <gnutls/gnutls.h>
#include <gnutls/crypto.h>
#include <gnutls/abstract.h>
#include <gnutls/x509.h>
#include <orcania.h>
#include <yder.h>
#include <rhonabwy.h>
static json_t * r_jws_parse_protected(const unsigned char * header_b64url) {
unsigned char * header = NULL;
size_t header_len = 0;
json_t * j_return = NULL;
do {
if (!o_base64url_decode(header_b64url, o_strlen((const char *)header_b64url), NULL, &header_len)) {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_parse_protected - Invalid base64");
break;
}
if ((header = o_malloc(header_len+4)) == NULL) {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_parse_protected - Error allocating resources for header");
break;
}
if (!o_base64url_decode(header_b64url, o_strlen((const char *)header_b64url), header, &header_len)) {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_parse_protected - Invalid base64 (2)");
break;
}
header[header_len] = '\0';
j_return = json_loads((const char *)header, JSON_DECODE_ANY, NULL);
} while(0);
o_free(header);
return j_return;
}
static int r_jws_extract_header(jws_t * jws, json_t * j_header, int x5u_flags) {
int ret;
jwk_t * jwk;
if (json_is_object(j_header)) {
ret = RHN_OK;
if (json_object_get(j_header, "alg") != NULL) {
if (0 != o_strcmp("HS256", json_string_value(json_object_get(j_header, "alg"))) && 0 != o_strcmp("HS384", json_string_value(json_object_get(j_header, "alg"))) && 0 != o_strcmp("HS512", json_string_value(json_object_get(j_header, "alg"))) &&
0 != o_strcmp("RS256", json_string_value(json_object_get(j_header, "alg"))) && 0 != o_strcmp("RS384", json_string_value(json_object_get(j_header, "alg"))) && 0 != o_strcmp("RS512", json_string_value(json_object_get(j_header, "alg"))) &&
0 != o_strcmp("PS256", json_string_value(json_object_get(j_header, "alg"))) && 0 != o_strcmp("PS384", json_string_value(json_object_get(j_header, "alg"))) && 0 != o_strcmp("PS512", json_string_value(json_object_get(j_header, "alg"))) &&
0 != o_strcmp("ES256", json_string_value(json_object_get(j_header, "alg"))) && 0 != o_strcmp("ES384", json_string_value(json_object_get(j_header, "alg"))) && 0 != o_strcmp("ES512", json_string_value(json_object_get(j_header, "alg"))) &&
0 != o_strcmp("EdDSA", json_string_value(json_object_get(j_header, "alg"))) && 0 != o_strcmp("ES256K", json_string_value(json_object_get(j_header, "alg"))) && 0 != o_strcmp("none", json_string_value(json_object_get(j_header, "alg")))) {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_extract_header - Invalid alg");
ret = RHN_ERROR_PARAM;
} else {
jws->alg = r_str_to_jwa_alg(json_string_value(json_object_get(j_header, "alg")));
}
}
if (json_string_length(json_object_get(j_header, "jku"))) {
if (r_jwks_import_from_uri(jws->jwks_pubkey, json_string_value(json_object_get(j_header, "jku")), x5u_flags) != RHN_OK) {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_extract_header - Error loading jwks from uri %s", json_string_value(json_object_get(j_header, "jku")));
}
}
if (json_object_get(j_header, "jwk") != NULL) {
r_jwk_init(&jwk);
if (r_jwk_import_from_json_t(jwk, json_object_get(j_header, "jwk")) == RHN_OK) {
if (r_jwks_append_jwk(jws->jwks_pubkey, jwk) != RHN_OK) {
ret = RHN_ERROR;
}
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_extract_header - Error parsing header jwk");
ret = RHN_ERROR_PARAM;
}
r_jwk_free(jwk);
}
if (json_object_get(j_header, "x5u") != NULL) {
r_jwk_init(&jwk);
if (r_jwk_import_from_x5u(jwk, x5u_flags, json_string_value(json_object_get(j_header, "x5u"))) == RHN_OK) {
if (r_jwks_append_jwk(jws->jwks_pubkey, jwk) != RHN_OK) {
ret = RHN_ERROR;
}
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_extract_header - Error importing x5c");
ret = RHN_ERROR_PARAM;
}
r_jwk_free(jwk);
}
if (json_object_get(j_header, "x5c") != NULL) {
r_jwk_init(&jwk);
if (r_jwk_import_from_x5c(jwk, json_string_value(json_array_get(json_object_get(j_header, "x5c"), 0))) == RHN_OK) {
if (r_jwks_append_jwk(jws->jwks_pubkey, jwk) != RHN_OK) {
ret = RHN_ERROR;
}
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_extract_header - Error importing x5c");
ret = RHN_ERROR_PARAM;
}
r_jwk_free(jwk);
}
} else {
ret = RHN_ERROR_PARAM;
}
return ret;
}
static int r_jws_set_header_value(jws_t * jws, int force) {
int ret = RHN_OK;
char * header_str = NULL;
unsigned char * token_b64 = NULL;
size_t token_b64_len = 0;
if (jws != NULL) {
if (jws->header_b64url == NULL || force) {
if ((header_str = json_dumps(jws->j_header, JSON_COMPACT)) != NULL) {
if ((token_b64 = o_malloc((2*o_strlen(header_str))+4)) != NULL) {
if (o_base64url_encode((const unsigned char *)header_str, o_strlen(header_str), token_b64, &token_b64_len)) {
o_free(jws->header_b64url);
jws->header_b64url = (unsigned char *)o_strndup((const char *)token_b64, token_b64_len);
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_set_header_value - Error o_base64url_encode header_str");
ret = RHN_ERROR;
}
o_free(token_b64);
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_set_header_value - Error allocating resources for token_b64 (1)");
ret = RHN_ERROR_MEMORY;
}
o_free(header_str);
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_set_header_value - Error json_dumps header_str");
ret = RHN_ERROR;
}
}
} else {
ret = RHN_ERROR_PARAM;
}
return ret;
}
static int r_jws_set_payload_value(jws_t * jws, int force) {
int ret = RHN_OK, zip = 0;
unsigned char * token_b64 = NULL, * payload_to_set = NULL;
size_t token_b64_len = 0, payload_to_set_len = 0;
if (jws != NULL) {
if (jws->payload_b64url == NULL || force) {
if (jws->payload_len) {
if (0 == o_strcmp("DEF", r_jws_get_header_str_value(jws, "zip"))) {
zip = 1;
if ((ret = _r_deflate_payload(jws->payload, jws->payload_len, &payload_to_set, &payload_to_set_len)) != RHN_OK) {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_set_payload_value - Error _r_deflate_payload");
}
} else {
payload_to_set = jws->payload;
payload_to_set_len = jws->payload_len;
}
if (ret == RHN_OK) {
if ((token_b64 = o_malloc((2*payload_to_set_len)+4)) != NULL) {
if (o_base64url_encode(payload_to_set, payload_to_set_len, token_b64, &token_b64_len)) {
o_free(jws->payload_b64url);
jws->payload_b64url = (unsigned char *)o_strndup((const char *)token_b64, token_b64_len);
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_set_payload_value - Error o_base64url_encode payload");
ret = RHN_ERROR;
}
o_free(token_b64);
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_set_payload_value - Error allocating resources for token_b64 (2)");
ret = RHN_ERROR_MEMORY;
}
}
if (zip) {
o_free(payload_to_set);
}
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_set_payload_value - Error empty payload");
ret = RHN_ERROR_PARAM;
}
}
} else {
ret = RHN_ERROR_PARAM;
}
return ret;
}
static int r_jws_set_token_values(jws_t * jws, int force) {
int ret;
if ((ret = r_jws_set_header_value(jws, force)) == RHN_OK) {
ret = r_jws_set_payload_value(jws, force);
}
return ret;
}
static unsigned char * r_jws_sign_hmac(jws_t * jws, jwk_t * jwk) {
int alg = GNUTLS_DIG_NULL;
unsigned char * data = NULL, * key = NULL, * sig = NULL, * sig_b64 = NULL, * to_return = NULL;
size_t key_len = 0, sig_len = 0, sig_b64_len = 0;
if (jws->alg == R_JWA_ALG_HS256) {
alg = GNUTLS_DIG_SHA256;
} else if (jws->alg == R_JWA_ALG_HS384) {
alg = GNUTLS_DIG_SHA384;
} else if (jws->alg == R_JWA_ALG_HS512) {
alg = GNUTLS_DIG_SHA512;
}
sig_len = gnutls_hmac_get_len(alg);
sig = o_malloc(sig_len);
sig_b64 = o_malloc(sig_len*2);
key_len = o_strlen(r_jwk_get_property_str(jwk, "k"));
key = o_malloc(key_len);
if (key != NULL) {
if (r_jwk_export_to_symmetric_key(jwk, key, &key_len) != RHN_OK) {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_sign_hmac - Error r_jwk_export_to_symmetric_key");
o_free(key);
key = NULL;
}
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_sign_hmac - Error allocating resources for key");
}
if (key != NULL && sig != NULL && sig_b64 != NULL) {
data = (unsigned char *)msprintf("%s.%s", jws->header_b64url, jws->payload_b64url);
if (!gnutls_hmac_fast(alg, key, key_len, data, o_strlen((const char *)data), sig)) {
if (o_base64url_encode(sig, sig_len, sig_b64, &sig_b64_len)) {
to_return = (unsigned char *)o_strndup((const char *)sig_b64, sig_b64_len);
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_sign_hmac - Error o_base64url_encode sig_b64");
}
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_sign_hmac - Error gnutls_hmac_fast");
}
}
o_free(data);
o_free(sig);
o_free(sig_b64);
o_free(key);
return to_return;
}
static unsigned char * r_jws_sign_rsa(jws_t * jws, jwk_t * jwk) {
gnutls_privkey_t privkey = r_jwk_export_to_gnutls_privkey(jwk);
gnutls_datum_t body_dat, sig_dat;
unsigned char * to_return = NULL;
int alg = GNUTLS_DIG_NULL, res, flag = 0;
size_t ret_size = 0;
switch (jws->alg) {
case R_JWA_ALG_RS256:
alg = GNUTLS_DIG_SHA256;
break;
case R_JWA_ALG_RS384:
alg = GNUTLS_DIG_SHA384;
break;
case R_JWA_ALG_RS512:
alg = GNUTLS_DIG_SHA512;
break;
/* RSA-PSS signature is available with GnuTLS >= 3.6 */
#if GNUTLS_VERSION_NUMBER >= 0x030600
case R_JWA_ALG_PS256:
alg = GNUTLS_SIGN_RSA_PSS_SHA256;
flag = GNUTLS_PRIVKEY_SIGN_FLAG_RSA_PSS;
break;
case R_JWA_ALG_PS384:
alg = GNUTLS_SIGN_RSA_PSS_SHA384;
flag = GNUTLS_PRIVKEY_SIGN_FLAG_RSA_PSS;
break;
case R_JWA_ALG_PS512:
alg = GNUTLS_SIGN_RSA_PSS_SHA512;
flag = GNUTLS_PRIVKEY_SIGN_FLAG_RSA_PSS;
break;
#endif
default:
break;
}
if (privkey != NULL && GNUTLS_PK_RSA == gnutls_privkey_get_pk_algorithm(privkey, NULL)) {
body_dat.data = (unsigned char *)msprintf("%s.%s", jws->header_b64url, jws->payload_b64url);
body_dat.size = o_strlen((const char *)body_dat.data);
if (!(res =
#if GNUTLS_VERSION_NUMBER >= 0x030600
gnutls_privkey_sign_data2
#else
gnutls_privkey_sign_data
#endif
(privkey, alg, flag, &body_dat, &sig_dat))) {
if ((to_return = o_malloc(sig_dat.size*2)) != NULL) {
if (o_base64url_encode(sig_dat.data, sig_dat.size, to_return, &ret_size)) {
to_return[ret_size] = '\0';
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_sign_rsa - Error o_base64url_encode for to_return");
o_free(to_return);
to_return = NULL;
}
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_sign_rsa - Error allocating resources for to_return");
}
gnutls_free(sig_dat.data);
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_sign_rsa - Error gnutls_privkey_sign_data2, res %d", res);
}
o_free(body_dat.data);
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_sign_rsa - Error extracting privkey");
}
gnutls_privkey_deinit(privkey);
return to_return;
}
static unsigned char * r_jws_sign_ecdsa(jws_t * jws, jwk_t * jwk) {
#if GNUTLS_VERSION_NUMBER >= 0x030600
gnutls_privkey_t privkey = r_jwk_export_to_gnutls_privkey(jwk);
gnutls_datum_t body_dat, sig_dat, r, s;
unsigned char * binary_sig = NULL, * to_return = NULL;
int alg = GNUTLS_DIG_NULL, res;
unsigned int adj = 0;
int r_padding = 0, s_padding = 0, r_out_padding = 0, s_out_padding = 0;
size_t sig_size, ret_size = 0;
if (jws->alg == R_JWA_ALG_ES256) {
alg = GNUTLS_DIG_SHA256;
adj = 32;
} else if (jws->alg == R_JWA_ALG_ES384) {
alg = GNUTLS_DIG_SHA384;
adj = 48;
} else if (jws->alg == R_JWA_ALG_ES512) {
alg = GNUTLS_DIG_SHA512;
adj = 66;
}
if (privkey != NULL && GNUTLS_PK_EC == gnutls_privkey_get_pk_algorithm(privkey, NULL)) {
body_dat.data = (unsigned char *)msprintf("%s.%s", jws->header_b64url, jws->payload_b64url);
body_dat.size = o_strlen((const char *)body_dat.data);
if (!(res = gnutls_privkey_sign_data(privkey, alg, 0, &body_dat, &sig_dat))) {
if (!gnutls_decode_rs_value(&sig_dat, &r, &s)) {
if (r.size > adj) {
r_padding = r.size - adj;
} else if (r.size < adj) {
r_out_padding = adj - r.size;
}
if (s.size > adj) {
s_padding = s.size - adj;
} else if (s.size < adj) {
s_out_padding = adj - s.size;
}
sig_size = adj << 1;
if ((binary_sig = o_malloc(sig_size)) != NULL) {
memset(binary_sig, 0, sig_size);
memcpy(binary_sig + r_out_padding, r.data + r_padding, r.size - r_padding);
memcpy(binary_sig + (r.size - r_padding + r_out_padding) + s_out_padding, s.data + s_padding, (s.size - s_padding));
if ((to_return = o_malloc(sig_size*2)) != NULL) {
if (o_base64url_encode(binary_sig, sig_size, to_return, &ret_size)) {
to_return[ret_size] = '\0';
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_sign_ecdsa - Error o_base64url_encode for to_return");
o_free(to_return);
to_return = NULL;
}
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_sign_ecdsa - Error allocating resources for to_return");
}
o_free(binary_sig);
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_sign_ecdsa - Error allocating resources for binary_sig");
}
gnutls_free(r.data);
gnutls_free(s.data);
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_sign_ecdsa - Error gnutls_decode_rs_value");
}
gnutls_free(sig_dat.data);
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_sign_ecdsa - Error gnutls_privkey_sign_data: %d", res);
}
o_free(body_dat.data);
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_sign_ecdsa - Error extracting privkey");
}
gnutls_privkey_deinit(privkey);
return to_return;
#else
(void)(jws);
(void)(jwk);
return NULL;
#endif
}
static unsigned char * r_jws_sign_eddsa(jws_t * jws, jwk_t * jwk) {
#if GNUTLS_VERSION_NUMBER >= 0x030600
gnutls_privkey_t privkey = r_jwk_export_to_gnutls_privkey(jwk);
gnutls_datum_t body_dat, sig_dat;
unsigned char * to_return = NULL;
int res;
size_t ret_size = 0;
if (privkey != NULL && GNUTLS_PK_EDDSA_ED25519 == gnutls_privkey_get_pk_algorithm(privkey, NULL)) {
body_dat.data = (unsigned char *)msprintf("%s.%s", jws->header_b64url, jws->payload_b64url);
body_dat.size = o_strlen((const char *)body_dat.data);
if (!(res = gnutls_privkey_sign_data(privkey, GNUTLS_DIG_SHA512, 0, &body_dat, &sig_dat))) {
if ((to_return = o_malloc(sig_dat.size*2)) != NULL) {
if (o_base64url_encode(sig_dat.data, sig_dat.size, to_return, &ret_size)) {
to_return[ret_size] = '\0';
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_sign_eddsa - Error o_base64url_encode for to_return");
o_free(to_return);
to_return = NULL;
}
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_sign_eddsa - Error allocating resources for to_return");
}
gnutls_free(sig_dat.data);
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_sign_eddsa - Error gnutls_privkey_sign_data: %d", res);
}
o_free(body_dat.data);
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_sign_eddsa - Error extracting privkey");
}
gnutls_privkey_deinit(privkey);
return to_return;
#else
(void)(jws);
(void)(jwk);
return NULL;
#endif
}
#if 0
static unsigned char * r_jws_sign_es256k(jws_t * jws, jwk_t * jwk) {
#if GNUTLS_VERSION_NUMBER >= 0x030600
gnutls_privkey_t privkey = r_jwk_export_to_gnutls_privkey(jwk);
gnutls_datum_t body_dat, sig_dat;
unsigned char * to_return = NULL;
int res;
size_t ret_size = 0;
if (privkey != NULL && GNUTLS_PK_EC == gnutls_privkey_get_pk_algorithm(privkey, NULL)) {
body_dat.data = (unsigned char *)msprintf("%s.%s", jws->header_b64url, jws->payload_b64url);
body_dat.size = o_strlen((const char *)body_dat.data);
if (!(res = gnutls_privkey_sign_data(privkey, GNUTLS_DIG_SHA256, 0, &body_dat, &sig_dat))) {
if ((to_return = o_malloc(sig_dat.size*2)) != NULL) {
if (o_base64url_encode(sig_dat.data, sig_dat.size, to_return, &ret_size)) {
to_return[ret_size] = '\0';
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_sign_es256k - Error o_base64url_encode for to_return");
o_free(to_return);
to_return = NULL;
}
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_sign_es256k - Error allocating resources for to_return");
}
gnutls_free(sig_dat.data);
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_sign_es256k - Error gnutls_privkey_sign_data: %d", res);
}
o_free(body_dat.data);
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_sign_es256k - Error extracting privkey");
}
gnutls_privkey_deinit(privkey);
return to_return;
#else
(void)(jws);
(void)(jwk);
return NULL;
#endif
}
#endif
static int r_jws_verify_sig_hmac(jws_t * jws, jwk_t * jwk) {
unsigned char * sig = r_jws_sign_hmac(jws, jwk);
int ret;
if (sig != NULL && 0 == o_strcmp((const char *)jws->signature_b64url, (const char *)sig)) {
ret = RHN_OK;
} else {
ret = RHN_ERROR_INVALID;
}
o_free(sig);
return ret;
}
static int r_jws_verify_sig_rsa(jws_t * jws, jwk_t * jwk, int x5u_flags) {
int alg = GNUTLS_DIG_NULL, ret = RHN_OK, flag = 0;
gnutls_datum_t sig_dat = {NULL, 0}, data;
gnutls_pubkey_t pubkey = r_jwk_export_to_gnutls_pubkey(jwk, x5u_flags);
unsigned char * sig = NULL;
size_t sig_len = 0;
data.data = (unsigned char *)msprintf("%s.%s", jws->header_b64url, jws->payload_b64url);
data.size = o_strlen((const char *)data.data);
switch (jws->alg) {
case R_JWA_ALG_RS256:
alg = GNUTLS_DIG_SHA256;
break;
case R_JWA_ALG_RS384:
alg = GNUTLS_DIG_SHA384;
break;
case R_JWA_ALG_RS512:
alg = GNUTLS_DIG_SHA512;
break;
#if GNUTLS_VERSION_NUMBER >= 0x030600
case R_JWA_ALG_PS256:
alg = GNUTLS_SIGN_RSA_PSS_SHA256;
flag = GNUTLS_PRIVKEY_SIGN_FLAG_RSA_PSS;
break;
case R_JWA_ALG_PS384:
alg = GNUTLS_SIGN_RSA_PSS_SHA384;
flag = GNUTLS_PRIVKEY_SIGN_FLAG_RSA_PSS;
break;
case R_JWA_ALG_PS512:
alg = GNUTLS_SIGN_RSA_PSS_SHA512;
flag = GNUTLS_PRIVKEY_SIGN_FLAG_RSA_PSS;
break;
#endif
default:
break;
}
if (pubkey != NULL && GNUTLS_PK_RSA == gnutls_pubkey_get_pk_algorithm(pubkey, NULL)) {
sig = o_malloc(o_strlen((const char *)jws->signature_b64url));
if (sig != NULL) {
if (o_base64url_decode(jws->signature_b64url, o_strlen((const char *)jws->signature_b64url), sig, &sig_len)) {
sig_dat.data = sig;
sig_dat.size = sig_len;
if (gnutls_pubkey_verify_data2(pubkey, alg, flag, &data, &sig_dat)) {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_verify_sig_rsa - Error invalid signature");
ret = RHN_ERROR_INVALID;
}
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_verify_sig_rsa - Error o_base64url_decode for sig");
ret = RHN_ERROR;
}
o_free(sig);
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_verify_sig_rsa - Error allocating resources for sig");
ret = RHN_ERROR_MEMORY;
}
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_verify_sig_rsa - Invalid public key");
ret = RHN_ERROR_PARAM;
}
o_free(data.data);
gnutls_pubkey_deinit(pubkey);
return ret;
}
static int r_jws_verify_sig_ecdsa(jws_t * jws, jwk_t * jwk, int x5u_flags) {
#if GNUTLS_VERSION_NUMBER >= 0x030600
int alg = 0, ret = RHN_OK;
gnutls_datum_t sig_dat = {NULL, 0}, r, s, data;
gnutls_pubkey_t pubkey = r_jwk_export_to_gnutls_pubkey(jwk, x5u_flags);
unsigned char * sig = NULL;
size_t sig_len = 0;
data.data = (unsigned char *)msprintf("%s.%s", jws->header_b64url, jws->payload_b64url);
data.size = o_strlen((const char *)data.data);
switch (jws->alg) {
case R_JWA_ALG_ES256:
alg = GNUTLS_SIGN_ECDSA_SHA256;
break;
case R_JWA_ALG_ES384:
alg = GNUTLS_SIGN_ECDSA_SHA384;
break;
case R_JWA_ALG_ES512:
alg = GNUTLS_SIGN_ECDSA_SHA512;
break;
default:
break;
}
if (pubkey != NULL && GNUTLS_PK_EC == gnutls_pubkey_get_pk_algorithm(pubkey, NULL)) {
sig = o_malloc(o_strlen((const char *)jws->signature_b64url));
if (sig != NULL) {
if (o_base64url_decode(jws->signature_b64url, o_strlen((const char *)jws->signature_b64url), sig, &sig_len)) {
if (sig_len == 64) {
r.size = 32;
r.data = sig;
s.size = 32;
s.data = sig + 32;
} else if (sig_len == 96) {
r.size = 48;
r.data = sig;
s.size = 48;
s.data = sig + 48;
} else if (sig_len == 132) {
r.size = 66;
r.data = sig;
s.size = 66;
s.data = sig + 66;
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_verify_sig_ecdsa - Error invalid signature length");
ret = RHN_ERROR_INVALID;
}
if (ret == RHN_OK) {
if (!gnutls_encode_rs_value(&sig_dat, &r, &s)) {
if (gnutls_pubkey_verify_data2(pubkey, alg, 0, &data, &sig_dat)) {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_verify_sig_ecdsa - Error invalid signature");
ret = RHN_ERROR_INVALID;
}
if (sig_dat.data != NULL) {
gnutls_free(sig_dat.data);
}
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_verify_sig_ecdsa - Error gnutls_encode_rs_value");
ret = RHN_ERROR;
}
}
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_verify_sig_ecdsa - Error o_base64url_decode for sig");
ret = RHN_ERROR;
}
o_free(sig);
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_verify_sig_ecdsa - Error allocating resources for sig");
ret = RHN_ERROR_MEMORY;
}
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_verify_sig_ecdsa - Invalid public key");
ret = RHN_ERROR_PARAM;
}
o_free(data.data);
gnutls_pubkey_deinit(pubkey);
return ret;
#else
(void)(jws);
(void)(jwk);
(void)(x5u_flags);
return RHN_ERROR_INVALID;
#endif
}
static int r_jws_verify_sig_eddsa(jws_t * jws, jwk_t * jwk, int x5u_flags) {
#if GNUTLS_VERSION_NUMBER >= 0x030600
int ret = RHN_OK;
gnutls_datum_t sig_dat = {NULL, 0}, data;
gnutls_pubkey_t pubkey = r_jwk_export_to_gnutls_pubkey(jwk, x5u_flags);
unsigned char * sig = NULL;
size_t sig_len = 0;
data.data = (unsigned char *)msprintf("%s.%s", jws->header_b64url, jws->payload_b64url);
data.size = o_strlen((const char *)data.data);
if (pubkey != NULL && GNUTLS_PK_EDDSA_ED25519 == gnutls_pubkey_get_pk_algorithm(pubkey, NULL)) {
sig = o_malloc(o_strlen((const char *)jws->signature_b64url));
if (sig != NULL) {
if (o_base64url_decode(jws->signature_b64url, o_strlen((const char *)jws->signature_b64url), sig, &sig_len)) {
sig_dat.data = sig;
sig_dat.size = sig_len;
if (gnutls_pubkey_verify_data2(pubkey, GNUTLS_SIGN_EDDSA_ED25519, 0, &data, &sig_dat)) {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_verify_sig_eddsa - Error invalid signature");
ret = RHN_ERROR_INVALID;
}
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_verify_sig_eddsa - Error o_base64url_decode for sig");
ret = RHN_ERROR;
}
o_free(sig);
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_verify_sig_eddsa - Error allocating resources for sig");
ret = RHN_ERROR_MEMORY;
}
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_verify_sig_eddsa - Invalid public key");
ret = RHN_ERROR_PARAM;
}
o_free(data.data);
gnutls_pubkey_deinit(pubkey);
return ret;
#else
(void)(jws);
(void)(jwk);
(void)(x5u_flags);
return RHN_ERROR_INVALID;
#endif
}
#if 0
static int r_jws_verify_sig_es256k(jws_t * jws, jwk_t * jwk, int x5u_flags) {
#if GNUTLS_VERSION_NUMBER >= 0x030600
int ret = RHN_OK;
gnutls_datum_t sig_dat = {NULL, 0}, data;
gnutls_pubkey_t pubkey = r_jwk_export_to_gnutls_pubkey(jwk, x5u_flags);
unsigned char * sig = NULL;
size_t sig_len = 0;
data.data = (unsigned char *)msprintf("%s.%s", jws->header_b64url, jws->payload_b64url);
data.size = o_strlen((const char *)data.data);
if (pubkey != NULL && GNUTLS_PK_EC == gnutls_pubkey_get_pk_algorithm(pubkey, NULL)) {
sig = o_malloc(o_strlen((const char *)jws->signature_b64url));
if (sig != NULL) {
if (o_base64url_decode(jws->signature_b64url, o_strlen((const char *)jws->signature_b64url), sig, &sig_len)) {
sig_dat.data = sig;
sig_dat.size = sig_len;
if (gnutls_pubkey_verify_data2(pubkey, GNUTLS_SIGN_ECDSA_SHA256, 0, &data, &sig_dat)) {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_verify_sig_es256k - Error invalid signature");
ret = RHN_ERROR_INVALID;
}
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_verify_sig_es256k - Error o_base64url_decode for sig");
ret = RHN_ERROR;
}
o_free(sig);
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_verify_sig_es256k - Error allocating resources for sig");
ret = RHN_ERROR_MEMORY;
}
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_verify_sig_es256k - Invalid public key");
ret = RHN_ERROR_PARAM;
}
o_free(data.data);
gnutls_pubkey_deinit(pubkey);
return ret;
#else
(void)(jws);
(void)(jwk);
(void)(x5u_flags);
return RHN_ERROR_INVALID;
#endif
}
#endif
static int _r_verify_signature(jws_t * jws, jwk_t * jwk, jwa_alg alg, int x5u_flags) {
int ret;
switch (alg) {
case R_JWA_ALG_HS256:
case R_JWA_ALG_HS384:
case R_JWA_ALG_HS512:
if (r_jwk_key_type(jwk, NULL, x5u_flags) & R_KEY_TYPE_HMAC) {
ret = r_jws_verify_sig_hmac(jws, jwk);
} else {
ret = RHN_ERROR_INVALID;
}
break;
case R_JWA_ALG_RS256:
case R_JWA_ALG_RS384:
case R_JWA_ALG_RS512:
case R_JWA_ALG_PS256:
case R_JWA_ALG_PS384:
case R_JWA_ALG_PS512:
if (r_jwk_key_type(jwk, NULL, x5u_flags) & R_KEY_TYPE_RSA) {
ret = r_jws_verify_sig_rsa(jws, jwk, x5u_flags);
} else {
ret = RHN_ERROR_INVALID;
}
break;
case R_JWA_ALG_ES256:
case R_JWA_ALG_ES384:
case R_JWA_ALG_ES512:
if (r_jwk_key_type(jwk, NULL, x5u_flags) & R_KEY_TYPE_EC) {
ret = r_jws_verify_sig_ecdsa(jws, jwk, x5u_flags);
} else {
ret = RHN_ERROR_INVALID;
}
break;
case R_JWA_ALG_EDDSA:
if (r_jwk_key_type(jwk, NULL, x5u_flags) & R_KEY_TYPE_EDDSA) {
ret = r_jws_verify_sig_eddsa(jws, jwk, x5u_flags);
} else {
ret = RHN_ERROR_INVALID;
}
break;
#if 0
case R_JWA_ALG_ES256K:
if (r_jwk_key_type(jwk, NULL, x5u_flags) & R_KEY_TYPE_EC) {
ret = r_jws_verify_sig_es256k(jws, jwk, x5u_flags);
} else {
ret = RHN_ERROR_INVALID;
}
break;
#endif
default:
ret = RHN_ERROR_INVALID;
break;
}
return ret;
}
static unsigned char * r_generate_signature(jws_t * jws, jwk_t * jwk, jwa_alg alg, int x5u_flags) {
unsigned char * str_ret = NULL;
if (jws != NULL && (jwk != NULL || alg == R_JWA_ALG_NONE)) {
switch (alg) {
case R_JWA_ALG_HS256:
case R_JWA_ALG_HS384:
case R_JWA_ALG_HS512:
if (r_jwk_key_type(jwk, NULL, x5u_flags) & R_KEY_TYPE_HMAC) {
str_ret = r_jws_sign_hmac(jws, jwk);
}
break;
case R_JWA_ALG_RS256:
case R_JWA_ALG_RS384:
case R_JWA_ALG_RS512:
case R_JWA_ALG_PS256:
case R_JWA_ALG_PS384:
case R_JWA_ALG_PS512:
if (r_jwk_key_type(jwk, NULL, x5u_flags) & R_KEY_TYPE_RSA) {
str_ret = r_jws_sign_rsa(jws, jwk);
}
break;
case R_JWA_ALG_ES256:
case R_JWA_ALG_ES384:
case R_JWA_ALG_ES512:
if (r_jwk_key_type(jwk, NULL, x5u_flags) & R_KEY_TYPE_EC) {
str_ret = r_jws_sign_ecdsa(jws, jwk);
}
break;
case R_JWA_ALG_EDDSA:
if (r_jwk_key_type(jwk, NULL, x5u_flags) & R_KEY_TYPE_EDDSA) {
str_ret = r_jws_sign_eddsa(jws, jwk);
}
break;
case R_JWA_ALG_NONE:
str_ret = (unsigned char *)o_strdup("");
break;
#if 0
case R_JWA_ALG_ES256K:
if (r_jwk_key_type(jwk, NULL, x5u_flags) & R_KEY_TYPE_EC) {
str_ret = r_jws_sign_es256k(jws, jwk);
}
break;
#endif
default:
y_log_message(Y_LOG_LEVEL_ERROR, "r_generate_signature - Unsupported algorithm");
break;
}
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_generate_signature - Error input parameters");
}
return str_ret;
}
int r_jws_init(jws_t ** jws) {
int ret;
if (jws != NULL) {
if ((*jws = o_malloc(sizeof(jws_t))) != NULL) {
if (((*jws)->j_header = json_object()) != NULL) {
if (r_jwks_init(&(*jws)->jwks_pubkey) == RHN_OK) {
if (r_jwks_init(&(*jws)->jwks_privkey) == RHN_OK) {
(*jws)->alg = R_JWA_ALG_UNKNOWN;
(*jws)->header_b64url = NULL;
(*jws)->payload_b64url = NULL;
(*jws)->signature_b64url = NULL;
(*jws)->payload = NULL;
(*jws)->payload_len = 0;
(*jws)->j_json_serialization = NULL;
(*jws)->token_mode = R_JSON_MODE_COMPACT;
ret = RHN_OK;
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_init - Error allocating resources for jwks_privkey");
ret = RHN_ERROR_MEMORY;
}
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_init - Error allocating resources for jwks_pubkey");
ret = RHN_ERROR_MEMORY;
}
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_init - Error allocating resources for j_header");
ret = RHN_ERROR_MEMORY;
}
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_init - Error allocating resources for jws");
ret = RHN_ERROR_MEMORY;
}
} else {
ret = RHN_ERROR_PARAM;
}
if (ret != RHN_OK && jws != NULL) {
r_jws_free(*jws);
*jws = NULL;
}
return ret;
}
void r_jws_free(jws_t * jws) {
if (jws != NULL) {
r_jwks_free(jws->jwks_privkey);
r_jwks_free(jws->jwks_pubkey);
o_free(jws->header_b64url);
o_free(jws->payload_b64url);
o_free(jws->signature_b64url);
json_decref(jws->j_header);
o_free(jws->payload);
json_decref(jws->j_json_serialization);
o_free(jws);
}
}
jws_t * r_jws_copy(jws_t * jws) {
jws_t * jws_copy = NULL;
if (jws != NULL) {
if (r_jws_init(&jws_copy) == RHN_OK) {
if (r_jws_set_payload(jws_copy, jws->payload, jws->payload_len) == RHN_OK) {
jws_copy->header_b64url = (unsigned char *)o_strdup((const char *)jws->header_b64url);
jws_copy->payload_b64url = (unsigned char *)o_strdup((const char *)jws->payload_b64url);
jws_copy->signature_b64url = (unsigned char *)o_strdup((const char *)jws->signature_b64url);
jws_copy->alg = jws->alg;
r_jwks_free(jws_copy->jwks_privkey);
jws_copy->jwks_privkey = r_jwks_copy(jws->jwks_privkey);
r_jwks_free(jws_copy->jwks_pubkey);
jws_copy->jwks_pubkey = r_jwks_copy(jws->jwks_pubkey);
json_decref(jws_copy->j_header);
jws_copy->j_header = json_deep_copy(jws->j_header);
jws_copy->j_json_serialization = json_deep_copy(jws->j_json_serialization);
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_copy - Error allocating resources for jws_copy->payload");
r_jws_free(jws_copy);
jws_copy = NULL;
}
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_copy - Error r_jws_init");
}
}
return jws_copy;
}
int r_jws_set_payload(jws_t * jws, const unsigned char * payload, size_t payload_len) {
int ret;
if (jws != NULL) {
o_free(jws->payload);
if (payload != NULL && payload_len) {
if ((jws->payload = o_malloc(payload_len)) != NULL) {
memcpy(jws->payload, payload, payload_len);
jws->payload_len = payload_len;
ret = RHN_OK;
} else {
y_log_message(Y_LOG_LEVEL_ERROR, "r_jws_set_payload - Error allocating resources for payload");
ret = RHN_ERROR_MEMORY;
}
} else {
jws->payload = NULL;
jws->payload_len = 0;
ret = RHN_OK;
}
} else {
ret = RHN_ERROR_PARAM;
}
return ret;
}
const unsigned char * r_jws_get_payload(jws_t * jws, size_t * payload_len) {
if (jws != NULL) {
if (payload_len != NULL) {
*payload_len = jws->payload_len;
}
return jws->payload;
}
return NULL;
}
int r_jws_set_alg(jws_t * jws, jwa_alg alg) {
int ret = RHN_OK;
if (jws != NULL) {
switch (alg) {
case R_JWA_ALG_NONE: