2 * Copyright (c) 2008, 2009 Nicira Networks.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 #include "vconn-ssl.h"
25 #include <netinet/tcp.h>
26 #include <openssl/err.h>
27 #include <openssl/ssl.h>
28 #include <openssl/x509v3.h>
30 #include <sys/fcntl.h>
33 #include "dynamic-string.h"
34 #include "leak-checker.h"
36 #include "openflow/openflow.h"
38 #include "poll-loop.h"
39 #include "socket-util.h"
40 #include "socket-util.h"
42 #include "vconn-provider.h"
46 #define THIS_MODULE VLM_vconn_ssl
65 enum session_type type;
71 /* rx_want and tx_want record the result of the last call to SSL_read()
72 * and SSL_write(), respectively:
74 * - If the call reported that data needed to be read from the file
75 * descriptor, the corresponding member is set to SSL_READING.
77 * - If the call reported that data needed to be written to the file
78 * descriptor, the corresponding member is set to SSL_WRITING.
80 * - Otherwise, the member is set to SSL_NOTHING, indicating that the
81 * call completed successfully (or with an error) and that there is no
84 * These are needed because there is no way to ask OpenSSL what a data read
85 * or write would require without giving it a buffer to receive into or
86 * data to send, respectively. (Note that the SSL_want() status is
87 * overwritten by each SSL_read() or SSL_write() call, so we can't rely on
90 * A single call to SSL_read() or SSL_write() can perform both reading
91 * and writing and thus invalidate not one of these values but actually
92 * both. Consider this situation, for example:
94 * - SSL_write() blocks on a read, so tx_want gets SSL_READING.
96 * - SSL_read() laters succeeds reading from 'fd' and clears out the
97 * whole receive buffer, so rx_want gets SSL_READING.
99 * - Client calls vconn_wait(WAIT_RECV) and vconn_wait(WAIT_SEND) and
102 * - Now we're stuck blocking until the peer sends us data, even though
103 * SSL_write() could now succeed, which could easily be a deadlock
106 * On the other hand, we can't reset both tx_want and rx_want on every call
107 * to SSL_read() or SSL_write(), because that would produce livelock,
108 * e.g. in this situation:
110 * - SSL_write() blocks, so tx_want gets SSL_READING or SSL_WRITING.
112 * - SSL_read() blocks, so rx_want gets SSL_READING or SSL_WRITING,
113 * but tx_want gets reset to SSL_NOTHING.
115 * - Client calls vconn_wait(WAIT_RECV) and vconn_wait(WAIT_SEND) and
118 * - Client wakes up immediately since SSL_NOTHING in tx_want indicates
119 * that no blocking is necessary.
121 * The solution we adopt here is to set tx_want to SSL_NOTHING after
122 * calling SSL_read() only if the SSL state of the connection changed,
123 * which indicates that an SSL-level renegotiation made some progress, and
124 * similarly for rx_want and SSL_write(). This prevents both the
125 * deadlock and livelock situations above.
127 int rx_want, tx_want;
130 /* SSL context created by ssl_init(). */
133 /* Required configuration. */
134 static bool has_private_key, has_certificate, has_ca_cert;
136 /* Ordinarily, we require a CA certificate for the peer to be locally
137 * available. 'has_ca_cert' is true when this is the case, and neither of the
138 * following variables matter.
140 * We can, however, bootstrap the CA certificate from the peer at the beginning
141 * of our first connection then use that certificate on all subsequent
142 * connections, saving it to a file for use in future runs also. In this case,
143 * 'has_ca_cert' is false, 'bootstrap_ca_cert' is true, and 'ca_cert_file'
144 * names the file to be saved. */
145 static bool bootstrap_ca_cert;
146 static char *ca_cert_file;
148 /* Who knows what can trigger various SSL errors, so let's throttle them down
150 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(10, 25);
152 static int ssl_init(void);
153 static int do_ssl_init(void);
154 static bool ssl_wants_io(int ssl_error);
155 static void ssl_close(struct vconn *);
156 static void ssl_clear_txbuf(struct ssl_vconn *);
157 static int interpret_ssl_error(const char *function, int ret, int error,
159 static DH *tmp_dh_callback(SSL *ssl, int is_export UNUSED, int keylength);
160 static void log_ca_cert(const char *file_name, X509 *cert);
163 want_to_poll_events(int want)
181 new_ssl_vconn(const char *name, int fd, enum session_type type,
182 enum ssl_state state, const struct sockaddr_in *remote,
183 struct vconn **vconnp)
185 struct sockaddr_in local;
186 socklen_t local_len = sizeof local;
187 struct ssl_vconn *sslv;
192 /* Check for all the needful configuration. */
194 if (!has_private_key) {
195 VLOG_ERR("Private key must be configured to use SSL");
196 retval = ENOPROTOOPT;
198 if (!has_certificate) {
199 VLOG_ERR("Certificate must be configured to use SSL");
200 retval = ENOPROTOOPT;
202 if (!has_ca_cert && !bootstrap_ca_cert) {
203 VLOG_ERR("CA certificate must be configured to use SSL");
204 retval = ENOPROTOOPT;
206 if (!SSL_CTX_check_private_key(ctx)) {
207 VLOG_ERR("Private key does not match certificate public key: %s",
208 ERR_error_string(ERR_get_error(), NULL));
209 retval = ENOPROTOOPT;
215 /* Get the local IP and port information */
216 retval = getsockname(fd, (struct sockaddr *) &local, &local_len);
218 memset(&local, 0, sizeof local);
222 retval = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &on, sizeof on);
224 VLOG_ERR("%s: setsockopt(TCP_NODELAY): %s", name, strerror(errno));
229 /* Create and configure OpenSSL stream. */
232 VLOG_ERR("SSL_new: %s", ERR_error_string(ERR_get_error(), NULL));
233 retval = ENOPROTOOPT;
236 if (SSL_set_fd(ssl, fd) == 0) {
237 VLOG_ERR("SSL_set_fd: %s", ERR_error_string(ERR_get_error(), NULL));
238 retval = ENOPROTOOPT;
241 if (bootstrap_ca_cert && type == CLIENT) {
242 SSL_set_verify(ssl, SSL_VERIFY_NONE, NULL);
245 /* Create and return the ssl_vconn. */
246 sslv = xmalloc(sizeof *sslv);
247 vconn_init(&sslv->vconn, &ssl_vconn_class, EAGAIN, name);
248 vconn_set_remote_ip(&sslv->vconn, remote->sin_addr.s_addr);
249 vconn_set_remote_port(&sslv->vconn, remote->sin_port);
250 vconn_set_local_ip(&sslv->vconn, local.sin_addr.s_addr);
251 vconn_set_local_port(&sslv->vconn, local.sin_port);
258 sslv->rx_want = sslv->tx_want = SSL_NOTHING;
259 *vconnp = &sslv->vconn;
270 static struct ssl_vconn *
271 ssl_vconn_cast(struct vconn *vconn)
273 vconn_assert_class(vconn, &ssl_vconn_class);
274 return CONTAINER_OF(vconn, struct ssl_vconn, vconn);
278 ssl_open(const char *name, char *suffix, struct vconn **vconnp)
280 struct sockaddr_in sin;
288 error = inet_open_active(SOCK_STREAM, suffix, OFP_SSL_PORT, &sin, &fd);
290 int state = error ? STATE_TCP_CONNECTING : STATE_SSL_CONNECTING;
291 return new_ssl_vconn(name, fd, CLIENT, state, &sin, vconnp);
293 VLOG_ERR("%s: connect: %s", name, strerror(error));
299 do_ca_cert_bootstrap(struct vconn *vconn)
301 struct ssl_vconn *sslv = ssl_vconn_cast(vconn);
302 STACK_OF(X509) *chain;
308 chain = SSL_get_peer_cert_chain(sslv->ssl);
309 if (!chain || !sk_X509_num(chain)) {
310 VLOG_ERR("could not bootstrap CA cert: no certificate presented by "
314 ca_cert = sk_X509_value(chain, sk_X509_num(chain) - 1);
316 /* Check that 'ca_cert' is self-signed. Otherwise it is not a CA
317 * certificate and we should not attempt to use it as one. */
318 error = X509_check_issued(ca_cert, ca_cert);
320 VLOG_ERR("could not bootstrap CA cert: obtained certificate is "
321 "not self-signed (%s)",
322 X509_verify_cert_error_string(error));
323 if (sk_X509_num(chain) < 2) {
324 VLOG_ERR("only one certificate was received, so probably the peer "
325 "is not configured to send its CA certificate");
330 fd = open(ca_cert_file, O_CREAT | O_EXCL | O_WRONLY, 0444);
332 VLOG_ERR("could not bootstrap CA cert: creating %s failed: %s",
333 ca_cert_file, strerror(errno));
337 file = fdopen(fd, "w");
340 VLOG_ERR("could not bootstrap CA cert: fdopen failed: %s",
342 unlink(ca_cert_file);
346 if (!PEM_write_X509(file, ca_cert)) {
347 VLOG_ERR("could not bootstrap CA cert: PEM_write_X509 to %s failed: "
348 "%s", ca_cert_file, ERR_error_string(ERR_get_error(), NULL));
350 unlink(ca_cert_file);
356 VLOG_ERR("could not bootstrap CA cert: writing %s failed: %s",
357 ca_cert_file, strerror(error));
358 unlink(ca_cert_file);
362 VLOG_INFO("successfully bootstrapped CA cert to %s", ca_cert_file);
363 log_ca_cert(ca_cert_file, ca_cert);
364 bootstrap_ca_cert = false;
367 /* SSL_CTX_add_client_CA makes a copy of ca_cert's relevant data. */
368 SSL_CTX_add_client_CA(ctx, ca_cert);
370 /* SSL_CTX_use_certificate() takes ownership of the certificate passed in.
371 * 'ca_cert' is owned by sslv->ssl, so we need to duplicate it. */
372 ca_cert = X509_dup(ca_cert);
376 if (SSL_CTX_load_verify_locations(ctx, ca_cert_file, NULL) != 1) {
377 VLOG_ERR("SSL_CTX_load_verify_locations: %s",
378 ERR_error_string(ERR_get_error(), NULL));
381 VLOG_INFO("killing successful connection to retry using CA cert");
386 ssl_connect(struct vconn *vconn)
388 struct ssl_vconn *sslv = ssl_vconn_cast(vconn);
391 switch (sslv->state) {
392 case STATE_TCP_CONNECTING:
393 retval = check_connection_completion(sslv->fd);
397 sslv->state = STATE_SSL_CONNECTING;
400 case STATE_SSL_CONNECTING:
401 retval = (sslv->type == CLIENT
402 ? SSL_connect(sslv->ssl) : SSL_accept(sslv->ssl));
404 int error = SSL_get_error(sslv->ssl, retval);
405 if (retval < 0 && ssl_wants_io(error)) {
409 interpret_ssl_error((sslv->type == CLIENT ? "SSL_connect"
410 : "SSL_accept"), retval, error, &unused);
411 shutdown(sslv->fd, SHUT_RDWR);
414 } else if (bootstrap_ca_cert) {
415 return do_ca_cert_bootstrap(vconn);
416 } else if ((SSL_get_verify_mode(sslv->ssl)
417 & (SSL_VERIFY_NONE | SSL_VERIFY_PEER))
418 != SSL_VERIFY_PEER) {
419 /* Two or more SSL connections completed at the same time while we
420 * were in bootstrap mode. Only one of these can finish the
421 * bootstrap successfully. The other one(s) must be rejected
422 * because they were not verified against the bootstrapped CA
423 * certificate. (Alternatively we could verify them against the CA
424 * certificate, but that's more trouble than it's worth. These
425 * connections will succeed the next time they retry, assuming that
426 * they have a certificate against the correct CA.) */
427 VLOG_ERR("rejecting SSL connection during bootstrap race window");
438 ssl_close(struct vconn *vconn)
440 struct ssl_vconn *sslv = ssl_vconn_cast(vconn);
441 ssl_clear_txbuf(sslv);
442 ofpbuf_delete(sslv->rxbuf);
449 interpret_ssl_error(const char *function, int ret, int error,
456 VLOG_ERR_RL(&rl, "%s: unexpected SSL_ERROR_NONE", function);
459 case SSL_ERROR_ZERO_RETURN:
460 VLOG_ERR_RL(&rl, "%s: unexpected SSL_ERROR_ZERO_RETURN", function);
463 case SSL_ERROR_WANT_READ:
467 case SSL_ERROR_WANT_WRITE:
471 case SSL_ERROR_WANT_CONNECT:
472 VLOG_ERR_RL(&rl, "%s: unexpected SSL_ERROR_WANT_CONNECT", function);
475 case SSL_ERROR_WANT_ACCEPT:
476 VLOG_ERR_RL(&rl, "%s: unexpected SSL_ERROR_WANT_ACCEPT", function);
479 case SSL_ERROR_WANT_X509_LOOKUP:
480 VLOG_ERR_RL(&rl, "%s: unexpected SSL_ERROR_WANT_X509_LOOKUP",
484 case SSL_ERROR_SYSCALL: {
485 int queued_error = ERR_get_error();
486 if (queued_error == 0) {
489 VLOG_WARN_RL(&rl, "%s: system error (%s)",
490 function, strerror(status));
493 VLOG_WARN_RL(&rl, "%s: unexpected SSL connection close",
498 VLOG_WARN_RL(&rl, "%s: %s",
499 function, ERR_error_string(queued_error, NULL));
504 case SSL_ERROR_SSL: {
505 int queued_error = ERR_get_error();
506 if (queued_error != 0) {
507 VLOG_WARN_RL(&rl, "%s: %s",
508 function, ERR_error_string(queued_error, NULL));
510 VLOG_ERR_RL(&rl, "%s: SSL_ERROR_SSL without queued error",
517 VLOG_ERR_RL(&rl, "%s: bad SSL error code %d", function, error);
524 ssl_recv(struct vconn *vconn, struct ofpbuf **bufferp)
526 struct ssl_vconn *sslv = ssl_vconn_cast(vconn);
532 if (sslv->rxbuf == NULL) {
533 sslv->rxbuf = ofpbuf_new(1564);
538 if (sizeof(struct ofp_header) > rx->size) {
539 want_bytes = sizeof(struct ofp_header) - rx->size;
541 struct ofp_header *oh = rx->data;
542 size_t length = ntohs(oh->length);
543 if (length < sizeof(struct ofp_header)) {
544 VLOG_ERR_RL(&rl, "received too-short ofp_header (%zu bytes)",
548 want_bytes = length - rx->size;
555 ofpbuf_prealloc_tailroom(rx, want_bytes);
557 /* Behavior of zero-byte SSL_read is poorly defined. */
558 assert(want_bytes > 0);
560 old_state = SSL_get_state(sslv->ssl);
561 ret = SSL_read(sslv->ssl, ofpbuf_tail(rx), want_bytes);
562 if (old_state != SSL_get_state(sslv->ssl)) {
563 sslv->tx_want = SSL_NOTHING;
565 sslv->rx_want = SSL_NOTHING;
569 if (ret == want_bytes) {
570 if (rx->size > sizeof(struct ofp_header)) {
580 int error = SSL_get_error(sslv->ssl, ret);
581 if (error == SSL_ERROR_ZERO_RETURN) {
582 /* Connection closed (EOF). */
584 VLOG_WARN_RL(&rl, "SSL_read: unexpected connection close");
590 return interpret_ssl_error("SSL_read", ret, error, &sslv->rx_want);
596 ssl_clear_txbuf(struct ssl_vconn *sslv)
598 ofpbuf_delete(sslv->txbuf);
603 ssl_do_tx(struct vconn *vconn)
605 struct ssl_vconn *sslv = ssl_vconn_cast(vconn);
608 int old_state = SSL_get_state(sslv->ssl);
609 int ret = SSL_write(sslv->ssl, sslv->txbuf->data, sslv->txbuf->size);
610 if (old_state != SSL_get_state(sslv->ssl)) {
611 sslv->rx_want = SSL_NOTHING;
613 sslv->tx_want = SSL_NOTHING;
615 ofpbuf_pull(sslv->txbuf, ret);
616 if (sslv->txbuf->size == 0) {
620 int ssl_error = SSL_get_error(sslv->ssl, ret);
621 if (ssl_error == SSL_ERROR_ZERO_RETURN) {
622 VLOG_WARN_RL(&rl, "SSL_write: connection closed");
625 return interpret_ssl_error("SSL_write", ret, ssl_error,
633 ssl_send(struct vconn *vconn, struct ofpbuf *buffer)
635 struct ssl_vconn *sslv = ssl_vconn_cast(vconn);
642 sslv->txbuf = buffer;
643 error = ssl_do_tx(vconn);
646 ssl_clear_txbuf(sslv);
649 leak_checker_claim(buffer);
659 ssl_run(struct vconn *vconn)
661 struct ssl_vconn *sslv = ssl_vconn_cast(vconn);
663 if (sslv->txbuf && ssl_do_tx(vconn) != EAGAIN) {
664 ssl_clear_txbuf(sslv);
669 ssl_run_wait(struct vconn *vconn)
671 struct ssl_vconn *sslv = ssl_vconn_cast(vconn);
673 if (sslv->tx_want != SSL_NOTHING) {
674 poll_fd_wait(sslv->fd, want_to_poll_events(sslv->tx_want));
679 ssl_wait(struct vconn *vconn, enum vconn_wait_type wait)
681 struct ssl_vconn *sslv = ssl_vconn_cast(vconn);
685 if (vconn_connect(vconn) != EAGAIN) {
686 poll_immediate_wake();
688 switch (sslv->state) {
689 case STATE_TCP_CONNECTING:
690 poll_fd_wait(sslv->fd, POLLOUT);
693 case STATE_SSL_CONNECTING:
694 /* ssl_connect() called SSL_accept() or SSL_connect(), which
695 * set up the status that we test here. */
696 poll_fd_wait(sslv->fd,
697 want_to_poll_events(SSL_want(sslv->ssl)));
707 if (sslv->rx_want != SSL_NOTHING) {
708 poll_fd_wait(sslv->fd, want_to_poll_events(sslv->rx_want));
710 poll_immediate_wake();
716 /* We have room in our tx queue. */
717 poll_immediate_wake();
719 /* vconn_run_wait() will do the right thing; don't bother with
729 struct vconn_class ssl_vconn_class = {
732 ssl_close, /* close */
733 ssl_connect, /* connect */
737 ssl_run_wait, /* run_wait */
745 struct pvconn pvconn;
749 struct pvconn_class pssl_pvconn_class;
751 static struct pssl_pvconn *
752 pssl_pvconn_cast(struct pvconn *pvconn)
754 pvconn_assert_class(pvconn, &pssl_pvconn_class);
755 return CONTAINER_OF(pvconn, struct pssl_pvconn, pvconn);
759 pssl_open(const char *name, char *suffix, struct pvconn **pvconnp)
761 struct pssl_pvconn *pssl;
770 fd = inet_open_passive(SOCK_STREAM, suffix, OFP_SSL_PORT);
775 pssl = xmalloc(sizeof *pssl);
776 pvconn_init(&pssl->pvconn, &pssl_pvconn_class, name);
778 *pvconnp = &pssl->pvconn;
783 pssl_close(struct pvconn *pvconn)
785 struct pssl_pvconn *pssl = pssl_pvconn_cast(pvconn);
791 pssl_accept(struct pvconn *pvconn, struct vconn **new_vconnp)
793 struct pssl_pvconn *pssl = pssl_pvconn_cast(pvconn);
794 struct sockaddr_in sin;
795 socklen_t sin_len = sizeof sin;
800 new_fd = accept(pssl->fd, &sin, &sin_len);
803 if (error != EAGAIN) {
804 VLOG_DBG_RL(&rl, "accept: %s", strerror(error));
809 error = set_nonblocking(new_fd);
815 sprintf(name, "ssl:"IP_FMT, IP_ARGS(&sin.sin_addr));
816 if (sin.sin_port != htons(OFP_SSL_PORT)) {
817 sprintf(strchr(name, '\0'), ":%"PRIu16, ntohs(sin.sin_port));
819 return new_ssl_vconn(name, new_fd, SERVER, STATE_SSL_CONNECTING, &sin,
824 pssl_wait(struct pvconn *pvconn)
826 struct pssl_pvconn *pssl = pssl_pvconn_cast(pvconn);
827 poll_fd_wait(pssl->fd, POLLIN);
830 struct pvconn_class pssl_pvconn_class = {
839 * Returns true if OpenSSL error is WANT_READ or WANT_WRITE, indicating that
840 * OpenSSL is requesting that we call it back when the socket is ready for read
841 * or writing, respectively.
844 ssl_wants_io(int ssl_error)
846 return (ssl_error == SSL_ERROR_WANT_WRITE
847 || ssl_error == SSL_ERROR_WANT_READ);
853 static int init_status = -1;
854 if (init_status < 0) {
855 init_status = do_ssl_init();
856 assert(init_status >= 0);
867 SSL_load_error_strings();
869 method = TLSv1_method();
870 if (method == NULL) {
871 VLOG_ERR("TLSv1_method: %s", ERR_error_string(ERR_get_error(), NULL));
875 ctx = SSL_CTX_new(method);
877 VLOG_ERR("SSL_CTX_new: %s", ERR_error_string(ERR_get_error(), NULL));
880 SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
881 SSL_CTX_set_tmp_dh_callback(ctx, tmp_dh_callback);
882 SSL_CTX_set_mode(ctx, SSL_MODE_ENABLE_PARTIAL_WRITE);
883 SSL_CTX_set_mode(ctx, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
884 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT,
891 tmp_dh_callback(SSL *ssl UNUSED, int is_export UNUSED, int keylength)
896 DH *(*constructor)(void);
899 static struct dh dh_table[] = {
900 {1024, NULL, get_dh1024},
901 {2048, NULL, get_dh2048},
902 {4096, NULL, get_dh4096},
907 for (dh = dh_table; dh < &dh_table[ARRAY_SIZE(dh_table)]; dh++) {
908 if (dh->keylength == keylength) {
910 dh->dh = dh->constructor();
912 ovs_fatal(ENOMEM, "out of memory constructing "
913 "Diffie-Hellman parameters");
919 VLOG_ERR_RL(&rl, "no Diffie-Hellman parameters for key length %d",
924 /* Returns true if SSL is at least partially configured. */
926 vconn_ssl_is_configured(void)
928 return has_private_key || has_certificate || has_ca_cert;
932 vconn_ssl_set_private_key_file(const char *file_name)
937 if (SSL_CTX_use_PrivateKey_file(ctx, file_name, SSL_FILETYPE_PEM) != 1) {
938 VLOG_ERR("SSL_use_PrivateKey_file: %s",
939 ERR_error_string(ERR_get_error(), NULL));
942 has_private_key = true;
946 vconn_ssl_set_certificate_file(const char *file_name)
951 if (SSL_CTX_use_certificate_chain_file(ctx, file_name) != 1) {
952 VLOG_ERR("SSL_use_certificate_file: %s",
953 ERR_error_string(ERR_get_error(), NULL));
956 has_certificate = true;
959 /* Reads the X509 certificate or certificates in file 'file_name'. On success,
960 * stores the address of the first element in an array of pointers to
961 * certificates in '*certs' and the number of certificates in the array in
962 * '*n_certs', and returns 0. On failure, stores a null pointer in '*certs', 0
963 * in '*n_certs', and returns a positive errno value.
965 * The caller is responsible for freeing '*certs'. */
967 read_cert_file(const char *file_name, X509 ***certs, size_t *n_certs)
970 size_t allocated_certs = 0;
975 file = fopen(file_name, "r");
977 VLOG_ERR("failed to open %s for reading: %s",
978 file_name, strerror(errno));
986 /* Read certificate from file. */
987 certificate = PEM_read_X509(file, NULL, NULL, NULL);
991 VLOG_ERR("PEM_read_X509 failed reading %s: %s",
992 file_name, ERR_error_string(ERR_get_error(), NULL));
993 for (i = 0; i < *n_certs; i++) {
994 X509_free((*certs)[i]);
1002 /* Add certificate to array. */
1003 if (*n_certs >= allocated_certs) {
1004 *certs = x2nrealloc(*certs, &allocated_certs, sizeof **certs);
1006 (*certs)[(*n_certs)++] = certificate;
1008 /* Are there additional certificates in the file? */
1011 } while (isspace(c));
1022 /* Sets 'file_name' as the name of a file containing one or more X509
1023 * certificates to send to the peer. Typical use in OpenFlow is to send the CA
1024 * certificate to the peer, which enables a switch to pick up the controller's
1025 * CA certificate on its first connection. */
1027 vconn_ssl_set_peer_ca_cert_file(const char *file_name)
1037 if (!read_cert_file(file_name, &certs, &n_certs)) {
1038 for (i = 0; i < n_certs; i++) {
1039 if (SSL_CTX_add_extra_chain_cert(ctx, certs[i]) != 1) {
1040 VLOG_ERR("SSL_CTX_add_extra_chain_cert: %s",
1041 ERR_error_string(ERR_get_error(), NULL));
1048 /* Logs fingerprint of CA certificate 'cert' obtained from 'file_name'. */
1050 log_ca_cert(const char *file_name, X509 *cert)
1052 unsigned char digest[EVP_MAX_MD_SIZE];
1053 unsigned int n_bytes;
1058 if (!X509_digest(cert, EVP_sha1(), digest, &n_bytes)) {
1059 ds_put_cstr(&fp, "<out of memory>");
1062 for (i = 0; i < n_bytes; i++) {
1064 ds_put_char(&fp, ':');
1066 ds_put_format(&fp, "%02hhx", digest[i]);
1069 subject = X509_NAME_oneline(X509_get_subject_name(cert), NULL, 0);
1070 VLOG_INFO("Trusting CA cert from %s (%s) (fingerprint %s)", file_name,
1071 subject ? subject : "<out of memory>", ds_cstr(&fp));
1076 /* Sets 'file_name' as the name of the file from which to read the CA
1077 * certificate used to verify the peer within SSL connections. If 'bootstrap'
1078 * is false, the file must exist. If 'bootstrap' is false, then the file is
1079 * read if it is exists; if it does not, then it will be created from the CA
1080 * certificate received from the peer on the first SSL connection. */
1082 vconn_ssl_set_ca_cert_file(const char *file_name, bool bootstrap)
1092 if (bootstrap && stat(file_name, &s) && errno == ENOENT) {
1093 bootstrap_ca_cert = true;
1094 ca_cert_file = xstrdup(file_name);
1095 } else if (!read_cert_file(file_name, &certs, &n_certs)) {
1098 /* Set up list of CAs that the server will accept from the client. */
1099 for (i = 0; i < n_certs; i++) {
1100 /* SSL_CTX_add_client_CA makes a copy of the relevant data. */
1101 if (SSL_CTX_add_client_CA(ctx, certs[i]) != 1) {
1102 VLOG_ERR("failed to add client certificate %d from %s: %s",
1104 ERR_error_string(ERR_get_error(), NULL));
1106 log_ca_cert(file_name, certs[i]);
1108 X509_free(certs[i]);
1111 /* Set up CAs for OpenSSL to trust in verifying the peer's
1113 if (SSL_CTX_load_verify_locations(ctx, file_name, NULL) != 1) {
1114 VLOG_ERR("SSL_CTX_load_verify_locations: %s",
1115 ERR_error_string(ERR_get_error(), NULL));