return ret;
}
+static int
+_tls13_derive_exporter(const mac_entry_st *prf,
+ gnutls_session_t session,
+ size_t label_size, const char *label,
+ size_t context_size, const char *context,
+ size_t outsize, char *out,
+ bool early)
+{
+ uint8_t secret[MAX_HASH_SIZE];
+ uint8_t digest[MAX_HASH_SIZE];
+ unsigned digest_size = prf->output_size;
+ int ret;
+
+ ret = _tls13_derive_secret2(prf, label, label_size, NULL, 0,
+ session->key.proto.tls13.ap_expkey,
+ secret);
+ if (ret < 0)
+ return gnutls_assert_val(ret);
+
+ ret = gnutls_hash_fast((gnutls_digest_algorithm_t)prf->id,
+ context, context_size, digest);
+ if (ret < 0)
+ return gnutls_assert_val(ret);
+
+ return _tls13_expand_secret2(prf,
+ EXPORTER_LABEL, sizeof(EXPORTER_LABEL)-1,
+ digest, digest_size,
+ secret, outsize, out);
+}
+
/**
* gnutls_prf_rfc5705:
* @session: is a #gnutls_session_t type.
* @outsize: size of pre-allocated output buffer to hold the output.
* @out: pre-allocated buffer to hold the generated data.
*
- * Exports keyring material from TLS/DTLS session to an application,
- * as specified in RFC5705.
+ * Exports keying material from TLS/DTLS session to an application, as
+ * specified in RFC5705.
*
* In the TLS versions prior to 1.3, it applies the TLS
* Pseudo-Random-Function (PRF) on the master secret and the provided
int ret;
if (vers && vers->tls13_sem) {
- uint8_t secret[MAX_HASH_SIZE];
- uint8_t digest[MAX_HASH_SIZE];
- unsigned digest_size = session->security_parameters.prf->output_size;
-
- /* exporter_master_secret might not be set, when
- * handshake is in progress */
- if (session->internals.handshake_in_progress) {
- gnutls_assert();
- return GNUTLS_E_INVALID_REQUEST;
- }
-
- ret = _tls13_derive_secret(session, label, label_size, NULL, 0,
- session->key.proto.tls13.ap_expkey, secret);
- if (ret < 0)
- return gnutls_assert_val(ret);
-
- ret = gnutls_hash_fast((gnutls_digest_algorithm_t)session->security_parameters.prf->id,
- context, context_size, digest);
- if (ret < 0)
- return gnutls_assert_val(ret);
-
- ret = _tls13_expand_secret(session, EXPORTER_LABEL, sizeof(EXPORTER_LABEL)-1,
- digest, digest_size,
- secret, outsize, out);
+ ret = _tls13_derive_exporter(session->security_parameters.prf,
+ session,
+ label_size, label,
+ context_size, context,
+ outsize, out,
+ 0);
} else {
char *pctx = NULL;
return ret;
}
+/**
+ * gnutls_prf_early:
+ * @session: is a #gnutls_session_t type.
+ * @label_size: length of the @label variable.
+ * @label: label used in PRF computation, typically a short string.
+ * @context_size: length of the @extra variable.
+ * @context: optional extra data to seed the PRF with.
+ * @outsize: size of pre-allocated output buffer to hold the output.
+ * @out: pre-allocated buffer to hold the generated data.
+ *
+ * This function is similar to gnutls_prf_rfc5705(), but only works in
+ * TLS 1.3 or later to export early keying material.
+ *
+ * Note that the keying material is only available after the
+ * ClientHello message is processed and before the application traffic
+ * keys are established. Therefore this function shall be called in a
+ * handshake hook function for %GNUTLS_HANDSHAKE_CLIENT_HELLO.
+ *
+ * The @label variable usually contains a string denoting the purpose
+ * for the generated data.
+ *
+ * The @context variable can be used to add more data to the seed, after
+ * the random variables. It can be used to make sure the
+ * generated output is strongly connected to some additional data
+ * (e.g., a string used in user authentication).
+ *
+ * The output is placed in @out, which must be pre-allocated.
+ *
+ * Note that, to provide the RFC5705 context, the @context variable
+ * must be non-null.
+ *
+ * Returns: %GNUTLS_E_SUCCESS on success, or an error code.
+ *
+ * Since: 3.6.6
+ **/
+int
+gnutls_prf_early(gnutls_session_t session,
+ size_t label_size, const char *label,
+ size_t context_size, const char *context,
+ size_t outsize, char *out)
+{
+ if (session->internals.initial_negotiation_completed ||
+ session->key.binders[0].prf == NULL)
+ return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
+
+ return _tls13_derive_exporter(session->key.binders[0].prf, session,
+ label_size, label,
+ context_size, context,
+ outsize, out,
+ 1);
+}
+
/**
* gnutls_prf:
* @session: is a #gnutls_session_t type.
--- /dev/null
+/*
+ * Copyright (C) 2015-2019 Red Hat, Inc.
+ *
+ * This file is part of GnuTLS.
+ *
+ * GnuTLS 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.
+ *
+ * GnuTLS 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 Lesser General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#if !defined(__linux__) || !defined(__GNUC__)
+
+int main(int argc, char **argv)
+{
+ exit(77);
+}
+
+#else
+
+#include <string.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+#include <gnutls/gnutls.h>
+#include <gnutls/crypto.h>
+
+#include "cert-common.h"
+#include "utils.h"
+#include "virt-time.h"
+
+static void terminate(void);
+
+#define SESSIONS 2
+#define MAX_BUF 5*1024
+#define MSG "Hello TLS"
+
+/* This program tests whether the gnutls_prf() works as
+ * expected.
+ */
+
+static void server_log_func(int level, const char *str)
+{
+ fprintf(stderr, "server|<%d>| %s", level, str);
+}
+
+static void client_log_func(int level, const char *str)
+{
+ fprintf(stderr, "client|<%d>| %s", level, str);
+}
+
+/* These are global */
+static pid_t child;
+
+static const
+gnutls_datum_t hrnd = {(void*)"\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 32};
+static const
+gnutls_datum_t hsrnd = {(void*)"\x00\x05\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 32};
+
+static int gnutls_rnd_works;
+
+int __attribute__ ((visibility ("protected")))
+gnutls_rnd(gnutls_rnd_level_t level, void *data, size_t len)
+{
+ gnutls_rnd_works = 1;
+
+ memset(data, 0xff, len);
+
+ /* Flip the first byte to avoid infinite loop in the RSA
+ * blinding code of Nettle */
+ if (len > 0)
+ memset(data, 0x0, 1);
+ return 0;
+}
+
+static gnutls_datum_t session_ticket_key = { NULL, 0 };
+
+static void dump(const char *name, const uint8_t *data, unsigned data_size)
+{
+ unsigned i;
+
+ fprintf(stderr, "%s", name);
+ for (i=0;i<data_size;i++)
+ fprintf(stderr, "\\x%.2x", (unsigned)data[i]);
+ fprintf(stderr, "\n");
+}
+
+#define TRY(label_size, label, extra_size, extra, size, exp) \
+ { \
+ ret = gnutls_prf_early(session, label_size, label, extra_size, extra, size, \
+ (void*)key_material); \
+ if (ret < 0) { \
+ fprintf(stderr, "gnutls_prf_early: error in %d\n", __LINE__); \
+ gnutls_perror(ret); \
+ exit(1); \
+ } \
+ if (memcmp(key_material, exp, size) != 0) { \
+ fprintf(stderr, "gnutls_prf_early: output doesn't match for '%s'\n", label); \
+ dump("got ", key_material, size); \
+ dump("expected ", exp, size); \
+ exit(1); \
+ } \
+ }
+
+#define KEY_EXP_VALUE "\xc0\x1e\xc2\xa4\xb7\xb4\x04\xaa\x91\x5d\xaf\xe8\xf7\x4d\x19\xdf\xd0\xe6\x08\xd6\xb4\x3b\xcf\xca\xc9\x32\x75\x3b\xe3\x11\x19\xb1\xac\x68"
+#define HELLO_VALUE "\x77\xdb\x10\x0b\xe8\xd0\xb9\x38\xbc\x49\xe6\xbe\xf2\x47\x2a\xcc\x6b\xea\xce\x85\x04\xd3\x9e\xd8\x06\x16\xad\xff\xcd\xbf\x4b"
+#define CONTEXT_VALUE "\xf2\x17\x9f\xf2\x66\x56\x87\x66\xf9\x5c\x8a\xd7\x4e\x1d\x46\xee\x0e\x44\x41\x4c\xcd\xac\xcb\xc0\x31\x41\x2a\xb6\xd7\x01\x62"
+#define NULL_CONTEXT_VALUE "\xcd\x79\x07\x93\xeb\x96\x07\x3e\xec\x78\x90\x89\xf7\x16\x42\x6d\x27\x87\x56\x7c\x7b\x60\x2b\x20\x44\xd1\xea\x0c\x89\xfb\x8b"
+
+static int handshake_callback_called;
+
+static int handshake_callback(gnutls_session_t session, unsigned int htype,
+ unsigned post, unsigned int incoming, const gnutls_datum_t *msg)
+{
+ unsigned char key_material[512];
+ int ret;
+
+ assert(post == GNUTLS_HOOK_POST);
+
+ handshake_callback_called++;
+
+ TRY(13, "key expansion", 0, NULL, 34, (uint8_t*)KEY_EXP_VALUE);
+ TRY(6, "hello", 0, NULL, 31, (uint8_t*)HELLO_VALUE);
+ TRY(7, "context", 5, "abcd\xfa", 31, (uint8_t*)CONTEXT_VALUE);
+ TRY(12, "null-context", 0, "", 31, (uint8_t*)NULL_CONTEXT_VALUE);
+
+ return 0;
+}
+
+static void client(int sds[])
+{
+ gnutls_session_t session;
+ int ret, ii;
+ gnutls_certificate_credentials_t clientx509cred;
+ const char *err;
+ int t;
+ gnutls_datum_t session_data = {NULL, 0};
+ char buffer[MAX_BUF + 1];
+
+ global_init();
+
+ virt_time_init();
+
+ if (debug) {
+ gnutls_global_set_log_function(client_log_func);
+ gnutls_global_set_log_level(4711);
+ }
+
+ gnutls_certificate_allocate_credentials(&clientx509cred);
+
+ for (t = 0; t < SESSIONS; t++) {
+ /* Initialize TLS session
+ */
+ gnutls_init(&session, GNUTLS_CLIENT);
+
+ /* Use default priorities */
+ ret = gnutls_priority_set_direct(session,
+ "NONE:+VERS-TLS1.3:+AES-256-GCM:+AEAD:+SIGN-RSA-PSS-RSAE-SHA384:+GROUP-SECP256R1",
+ &err);
+ if (ret < 0) {
+ fail("client: priority set failed (%s): %s\n",
+ gnutls_strerror(ret), err);
+ exit(1);
+ }
+
+ ret = gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE,
+ clientx509cred);
+ if (ret < 0)
+ exit(1);
+
+ gnutls_handshake_set_random(session, &hrnd);
+ gnutls_transport_set_int(session, sds[t]);
+
+ if (t > 0) {
+ gnutls_session_set_data(session, session_data.data,
+ session_data.size);
+ gnutls_handshake_set_hook_function(session, GNUTLS_HANDSHAKE_CLIENT_HELLO,
+ GNUTLS_HOOK_POST,
+ handshake_callback);
+ }
+
+ /* Perform the TLS handshake
+ */
+ do {
+ ret = gnutls_handshake(session);
+ }
+ while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
+
+ if (ret < 0) {
+ fail("client: Handshake failed: %s\n", strerror(ret));
+ exit(1);
+ } else {
+ if (debug)
+ success("client: Handshake was completed\n");
+ }
+
+ if (debug)
+ success("client: TLS version is: %s\n",
+ gnutls_protocol_get_name
+ (gnutls_protocol_get_version(session)));
+
+ ret = gnutls_cipher_get(session);
+ if (ret != GNUTLS_CIPHER_AES_256_GCM) {
+ fprintf(stderr, "negotiated unexpected cipher: %s\n", gnutls_cipher_get_name(ret));
+ exit(1);
+ }
+
+ ret = gnutls_mac_get(session);
+ if (ret != GNUTLS_MAC_AEAD) {
+ fprintf(stderr, "negotiated unexpected mac: %s\n", gnutls_mac_get_name(ret));
+ exit(1);
+ }
+
+ if (t == 0) {
+ /* get the session data size */
+ ret =
+ gnutls_session_get_data2(session,
+ &session_data);
+ if (ret < 0)
+ fail("Getting resume data failed\n");
+
+ if (handshake_callback_called != 0)
+ fail("client: handshake callback is called\n");
+ } else {
+ if (handshake_callback_called != t)
+ fail("client: handshake callback is not called\n");
+ }
+
+ gnutls_record_send(session, MSG, strlen(MSG));
+
+ do {
+ ret = gnutls_record_recv(session, buffer, MAX_BUF);
+ } while (ret == GNUTLS_E_AGAIN);
+ if (ret == 0) {
+ if (debug)
+ success
+ ("client: Peer has closed the TLS connection\n");
+ } else if (ret < 0) {
+ fail("client: Error: %s\n", gnutls_strerror(ret));
+ }
+
+ if (debug) {
+ printf("- Received %d bytes: ", ret);
+ for (ii = 0; ii < ret; ii++) {
+ fputc(buffer[ii], stdout);
+ }
+ fputs("\n", stdout);
+ }
+
+ gnutls_bye(session, GNUTLS_SHUT_WR);
+
+ close(sds[t]);
+
+ gnutls_deinit(session);
+ }
+
+ gnutls_free(session_data.data);
+ gnutls_certificate_free_credentials(clientx509cred);
+
+ gnutls_global_deinit();
+}
+
+static void terminate(void)
+{
+ int status = 0;
+
+ kill(child, SIGTERM);
+ wait(&status);
+ exit(1);
+}
+
+static void server(int sds[])
+{
+ int ret;
+ gnutls_session_t session;
+ gnutls_certificate_credentials_t serverx509cred;
+ int t;
+ char buffer[MAX_BUF + 1];
+
+ /* this must be called once in the program
+ */
+ global_init();
+
+ virt_time_init();
+
+ if (debug) {
+ gnutls_global_set_log_function(server_log_func);
+ gnutls_global_set_log_level(4711);
+ }
+
+ gnutls_certificate_allocate_credentials(&serverx509cred);
+
+ gnutls_session_ticket_key_generate(&session_ticket_key);
+
+ for (t = 0; t < SESSIONS; t++) {
+ gnutls_init(&session, GNUTLS_SERVER);
+
+ gnutls_session_ticket_enable_server(session,
+ &session_ticket_key);
+
+ /* avoid calling all the priority functions, since the defaults
+ * are adequate.
+ */
+ ret = gnutls_priority_set_direct(session,
+ "NORMAL:-VERS-ALL:+VERS-TLS1.3:-KX-ALL:-SIGN-ALL:+SIGN-RSA-PSS-RSAE-SHA384:-GROUP-ALL:+GROUP-SECP256R1", NULL);
+ if (ret < 0) {
+ fail("server: priority set failed (%s)\n\n",
+ gnutls_strerror(ret));
+ terminate();
+ }
+
+ gnutls_certificate_set_x509_key_mem(serverx509cred,
+ &server_cert, &server_key,
+ GNUTLS_X509_FMT_PEM);
+ gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE,
+ serverx509cred);
+
+ gnutls_handshake_set_random(session, &hsrnd);
+ gnutls_transport_set_int(session, sds[t]);
+
+ if (t > 0) {
+ if (!gnutls_rnd_works) {
+ fprintf(stderr, "gnutls_rnd() could not be overridden, skipping prf checks see #584\n");
+ exit(77);
+ } else {
+ gnutls_handshake_set_hook_function(session, GNUTLS_HANDSHAKE_CLIENT_HELLO,
+ GNUTLS_HOOK_POST,
+ handshake_callback);
+ }
+ }
+
+ do {
+ ret = gnutls_handshake(session);
+ }
+ while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
+ if (ret < 0) {
+ close(sds[t]);
+ gnutls_deinit(session);
+ fail("server: Handshake has failed (%s)\n\n",
+ gnutls_strerror(ret));
+ terminate();
+ }
+ if (debug)
+ success("server: Handshake was completed\n");
+
+ if (debug)
+ success("server: TLS version is: %s\n",
+ gnutls_protocol_get_name
+ (gnutls_protocol_get_version(session)));
+
+ if (t == 0) {
+ if (handshake_callback_called != 0)
+ fail("server: handshake callback is called\n");
+ } else {
+ if (handshake_callback_called != t)
+ fail("server: handshake callback is not called\n");
+ }
+
+ for (;;) {
+ memset(buffer, 0, MAX_BUF + 1);
+ ret = gnutls_record_recv(session, buffer, MAX_BUF);
+
+ if (ret == 0) {
+ if (debug)
+ success
+ ("server: Peer has closed the GnuTLS connection\n");
+ break;
+ } else if (ret < 0) {
+ kill(child, SIGTERM);
+ fail("server: Received corrupted data(%d). Closing...\n", ret);
+ break;
+ } else if (ret > 0) {
+ /* echo data back to the client
+ */
+ gnutls_record_send(session, buffer,
+ strlen(buffer));
+ }
+ }
+
+ /* do not wait for the peer to close the connection.
+ */
+ gnutls_bye(session, GNUTLS_SHUT_WR);
+
+ close(sds[t]);
+ gnutls_deinit(session);
+ }
+
+ gnutls_certificate_free_credentials(serverx509cred);
+
+ gnutls_free(session_ticket_key.data);
+ session_ticket_key.data = NULL;
+
+ gnutls_global_deinit();
+
+ if (debug)
+ success("server: finished\n");
+}
+
+void doit(void)
+{
+ int client_sds[SESSIONS], server_sds[SESSIONS];
+ int i;
+ int ret;
+
+ signal(SIGPIPE, SIG_IGN);
+
+ for (i = 0; i < SESSIONS; i++) {
+ int sockets[2];
+
+ ret = socketpair(AF_UNIX, SOCK_STREAM, 0, sockets);
+ if (ret == -1) {
+ perror("socketpair");
+ fail("socketpair failed\n");
+ return;
+ }
+
+ server_sds[i] = sockets[0];
+ client_sds[i] = sockets[1];
+ }
+
+ child = fork();
+ if (child < 0) {
+ perror("fork");
+ fail("fork");
+ exit(1);
+ }
+
+ if (child) {
+ int status = 0;
+ /* parent */
+
+ for (i = 0; i < SESSIONS; i++)
+ close(client_sds[i]);
+ server(server_sds);
+ wait(&status);
+ check_wait_status(status);
+ } else {
+ for (i = 0; i < SESSIONS; i++)
+ close(server_sds[i]);
+ client(client_sds);
+ exit(0);
+ }
+}
+
+#endif /* _WIN32 */
projects / thirdparty / gnutls.git / commitdiff
