2 * Copyright (c) 2008, 2009, 2010 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 "stream-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 "stream-provider.h"
46 #define THIS_MODULE VLM_stream_ssl
65 enum session_type type;
70 /* rx_want and tx_want record the result of the last call to SSL_read()
71 * and SSL_write(), respectively:
73 * - If the call reported that data needed to be read from the file
74 * descriptor, the corresponding member is set to SSL_READING.
76 * - If the call reported that data needed to be written to the file
77 * descriptor, the corresponding member is set to SSL_WRITING.
79 * - Otherwise, the member is set to SSL_NOTHING, indicating that the
80 * call completed successfully (or with an error) and that there is no
83 * These are needed because there is no way to ask OpenSSL what a data read
84 * or write would require without giving it a buffer to receive into or
85 * data to send, respectively. (Note that the SSL_want() status is
86 * overwritten by each SSL_read() or SSL_write() call, so we can't rely on
89 * A single call to SSL_read() or SSL_write() can perform both reading
90 * and writing and thus invalidate not one of these values but actually
91 * both. Consider this situation, for example:
93 * - SSL_write() blocks on a read, so tx_want gets SSL_READING.
95 * - SSL_read() laters succeeds reading from 'fd' and clears out the
96 * whole receive buffer, so rx_want gets SSL_READING.
98 * - Client calls stream_wait(STREAM_RECV) and stream_wait(STREAM_SEND)
101 * - Now we're stuck blocking until the peer sends us data, even though
102 * SSL_write() could now succeed, which could easily be a deadlock
105 * On the other hand, we can't reset both tx_want and rx_want on every call
106 * to SSL_read() or SSL_write(), because that would produce livelock,
107 * e.g. in this situation:
109 * - SSL_write() blocks, so tx_want gets SSL_READING or SSL_WRITING.
111 * - SSL_read() blocks, so rx_want gets SSL_READING or SSL_WRITING,
112 * but tx_want gets reset to SSL_NOTHING.
114 * - Client calls stream_wait(STREAM_RECV) and stream_wait(STREAM_SEND)
117 * - Client wakes up immediately since SSL_NOTHING in tx_want indicates
118 * that no blocking is necessary.
120 * The solution we adopt here is to set tx_want to SSL_NOTHING after
121 * calling SSL_read() only if the SSL state of the connection changed,
122 * which indicates that an SSL-level renegotiation made some progress, and
123 * similarly for rx_want and SSL_write(). This prevents both the
124 * deadlock and livelock situations above.
126 int rx_want, tx_want;
129 /* SSL context created by ssl_init(). */
132 /* Required configuration. */
133 static bool has_private_key, has_certificate, has_ca_cert;
135 /* Ordinarily, we require a CA certificate for the peer to be locally
136 * available. 'has_ca_cert' is true when this is the case, and neither of the
137 * following variables matter.
139 * We can, however, bootstrap the CA certificate from the peer at the beginning
140 * of our first connection then use that certificate on all subsequent
141 * connections, saving it to a file for use in future runs also. In this case,
142 * 'has_ca_cert' is false, 'bootstrap_ca_cert' is true, and 'ca_cert_file'
143 * names the file to be saved. */
144 static bool bootstrap_ca_cert;
145 static char *ca_cert_file;
147 /* Who knows what can trigger various SSL errors, so let's throttle them down
149 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(10, 25);
151 static int ssl_init(void);
152 static int do_ssl_init(void);
153 static bool ssl_wants_io(int ssl_error);
154 static void ssl_close(struct stream *);
155 static void ssl_clear_txbuf(struct ssl_stream *);
156 static int interpret_ssl_error(const char *function, int ret, int error,
158 static DH *tmp_dh_callback(SSL *ssl, int is_export UNUSED, int keylength);
159 static void log_ca_cert(const char *file_name, X509 *cert);
162 want_to_poll_events(int want)
180 new_ssl_stream(const char *name, int fd, enum session_type type,
181 enum ssl_state state, const struct sockaddr_in *remote,
182 struct stream **streamp)
184 struct sockaddr_in local;
185 socklen_t local_len = sizeof local;
186 struct ssl_stream *sslv;
191 /* Check for all the needful configuration. */
193 if (!has_private_key) {
194 VLOG_ERR("Private key must be configured to use SSL");
195 retval = ENOPROTOOPT;
197 if (!has_certificate) {
198 VLOG_ERR("Certificate must be configured to use SSL");
199 retval = ENOPROTOOPT;
201 if (!has_ca_cert && !bootstrap_ca_cert) {
202 VLOG_ERR("CA certificate must be configured to use SSL");
203 retval = ENOPROTOOPT;
205 if (!SSL_CTX_check_private_key(ctx)) {
206 VLOG_ERR("Private key does not match certificate public key: %s",
207 ERR_error_string(ERR_get_error(), NULL));
208 retval = ENOPROTOOPT;
214 /* Get the local IP and port information */
215 retval = getsockname(fd, (struct sockaddr *) &local, &local_len);
217 memset(&local, 0, sizeof local);
221 retval = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &on, sizeof on);
223 VLOG_ERR("%s: setsockopt(TCP_NODELAY): %s", name, strerror(errno));
228 /* Create and configure OpenSSL stream. */
231 VLOG_ERR("SSL_new: %s", ERR_error_string(ERR_get_error(), NULL));
232 retval = ENOPROTOOPT;
235 if (SSL_set_fd(ssl, fd) == 0) {
236 VLOG_ERR("SSL_set_fd: %s", ERR_error_string(ERR_get_error(), NULL));
237 retval = ENOPROTOOPT;
240 if (bootstrap_ca_cert && type == CLIENT) {
241 SSL_set_verify(ssl, SSL_VERIFY_NONE, NULL);
244 /* Create and return the ssl_stream. */
245 sslv = xmalloc(sizeof *sslv);
246 stream_init(&sslv->stream, &ssl_stream_class, EAGAIN, name);
247 stream_set_remote_ip(&sslv->stream, remote->sin_addr.s_addr);
248 stream_set_remote_port(&sslv->stream, remote->sin_port);
249 stream_set_local_ip(&sslv->stream, local.sin_addr.s_addr);
250 stream_set_local_port(&sslv->stream, local.sin_port);
256 sslv->rx_want = sslv->tx_want = SSL_NOTHING;
257 *streamp = &sslv->stream;
268 static struct ssl_stream *
269 ssl_stream_cast(struct stream *stream)
271 stream_assert_class(stream, &ssl_stream_class);
272 return CONTAINER_OF(stream, struct ssl_stream, stream);
276 ssl_open(const char *name, char *suffix, struct stream **streamp)
278 struct sockaddr_in sin;
286 error = inet_open_active(SOCK_STREAM, suffix, OFP_SSL_PORT, &sin, &fd);
288 int state = error ? STATE_TCP_CONNECTING : STATE_SSL_CONNECTING;
289 return new_ssl_stream(name, fd, CLIENT, state, &sin, streamp);
291 VLOG_ERR("%s: connect: %s", name, strerror(error));
297 do_ca_cert_bootstrap(struct stream *stream)
299 struct ssl_stream *sslv = ssl_stream_cast(stream);
300 STACK_OF(X509) *chain;
306 chain = SSL_get_peer_cert_chain(sslv->ssl);
307 if (!chain || !sk_X509_num(chain)) {
308 VLOG_ERR("could not bootstrap CA cert: no certificate presented by "
312 ca_cert = sk_X509_value(chain, sk_X509_num(chain) - 1);
314 /* Check that 'ca_cert' is self-signed. Otherwise it is not a CA
315 * certificate and we should not attempt to use it as one. */
316 error = X509_check_issued(ca_cert, ca_cert);
318 VLOG_ERR("could not bootstrap CA cert: obtained certificate is "
319 "not self-signed (%s)",
320 X509_verify_cert_error_string(error));
321 if (sk_X509_num(chain) < 2) {
322 VLOG_ERR("only one certificate was received, so probably the peer "
323 "is not configured to send its CA certificate");
328 fd = open(ca_cert_file, O_CREAT | O_EXCL | O_WRONLY, 0444);
330 VLOG_ERR("could not bootstrap CA cert: creating %s failed: %s",
331 ca_cert_file, strerror(errno));
335 file = fdopen(fd, "w");
338 VLOG_ERR("could not bootstrap CA cert: fdopen failed: %s",
340 unlink(ca_cert_file);
344 if (!PEM_write_X509(file, ca_cert)) {
345 VLOG_ERR("could not bootstrap CA cert: PEM_write_X509 to %s failed: "
346 "%s", ca_cert_file, ERR_error_string(ERR_get_error(), NULL));
348 unlink(ca_cert_file);
354 VLOG_ERR("could not bootstrap CA cert: writing %s failed: %s",
355 ca_cert_file, strerror(error));
356 unlink(ca_cert_file);
360 VLOG_INFO("successfully bootstrapped CA cert to %s", ca_cert_file);
361 log_ca_cert(ca_cert_file, ca_cert);
362 bootstrap_ca_cert = false;
365 /* SSL_CTX_add_client_CA makes a copy of ca_cert's relevant data. */
366 SSL_CTX_add_client_CA(ctx, ca_cert);
368 /* SSL_CTX_use_certificate() takes ownership of the certificate passed in.
369 * 'ca_cert' is owned by sslv->ssl, so we need to duplicate it. */
370 ca_cert = X509_dup(ca_cert);
374 if (SSL_CTX_load_verify_locations(ctx, ca_cert_file, NULL) != 1) {
375 VLOG_ERR("SSL_CTX_load_verify_locations: %s",
376 ERR_error_string(ERR_get_error(), NULL));
379 VLOG_INFO("killing successful connection to retry using CA cert");
384 ssl_connect(struct stream *stream)
386 struct ssl_stream *sslv = ssl_stream_cast(stream);
389 switch (sslv->state) {
390 case STATE_TCP_CONNECTING:
391 retval = check_connection_completion(sslv->fd);
395 sslv->state = STATE_SSL_CONNECTING;
398 case STATE_SSL_CONNECTING:
399 retval = (sslv->type == CLIENT
400 ? SSL_connect(sslv->ssl) : SSL_accept(sslv->ssl));
402 int error = SSL_get_error(sslv->ssl, retval);
403 if (retval < 0 && ssl_wants_io(error)) {
407 interpret_ssl_error((sslv->type == CLIENT ? "SSL_connect"
408 : "SSL_accept"), retval, error, &unused);
409 shutdown(sslv->fd, SHUT_RDWR);
412 } else if (bootstrap_ca_cert) {
413 return do_ca_cert_bootstrap(stream);
414 } else if ((SSL_get_verify_mode(sslv->ssl)
415 & (SSL_VERIFY_NONE | SSL_VERIFY_PEER))
416 != SSL_VERIFY_PEER) {
417 /* Two or more SSL connections completed at the same time while we
418 * were in bootstrap mode. Only one of these can finish the
419 * bootstrap successfully. The other one(s) must be rejected
420 * because they were not verified against the bootstrapped CA
421 * certificate. (Alternatively we could verify them against the CA
422 * certificate, but that's more trouble than it's worth. These
423 * connections will succeed the next time they retry, assuming that
424 * they have a certificate against the correct CA.) */
425 VLOG_ERR("rejecting SSL connection during bootstrap race window");
436 ssl_close(struct stream *stream)
438 struct ssl_stream *sslv = ssl_stream_cast(stream);
439 ssl_clear_txbuf(sslv);
446 interpret_ssl_error(const char *function, int ret, int error,
453 VLOG_ERR_RL(&rl, "%s: unexpected SSL_ERROR_NONE", function);
456 case SSL_ERROR_ZERO_RETURN:
457 VLOG_ERR_RL(&rl, "%s: unexpected SSL_ERROR_ZERO_RETURN", function);
460 case SSL_ERROR_WANT_READ:
464 case SSL_ERROR_WANT_WRITE:
468 case SSL_ERROR_WANT_CONNECT:
469 VLOG_ERR_RL(&rl, "%s: unexpected SSL_ERROR_WANT_CONNECT", function);
472 case SSL_ERROR_WANT_ACCEPT:
473 VLOG_ERR_RL(&rl, "%s: unexpected SSL_ERROR_WANT_ACCEPT", function);
476 case SSL_ERROR_WANT_X509_LOOKUP:
477 VLOG_ERR_RL(&rl, "%s: unexpected SSL_ERROR_WANT_X509_LOOKUP",
481 case SSL_ERROR_SYSCALL: {
482 int queued_error = ERR_get_error();
483 if (queued_error == 0) {
486 VLOG_WARN_RL(&rl, "%s: system error (%s)",
487 function, strerror(status));
490 VLOG_WARN_RL(&rl, "%s: unexpected SSL connection close",
495 VLOG_WARN_RL(&rl, "%s: %s",
496 function, ERR_error_string(queued_error, NULL));
501 case SSL_ERROR_SSL: {
502 int queued_error = ERR_get_error();
503 if (queued_error != 0) {
504 VLOG_WARN_RL(&rl, "%s: %s",
505 function, ERR_error_string(queued_error, NULL));
507 VLOG_ERR_RL(&rl, "%s: SSL_ERROR_SSL without queued error",
514 VLOG_ERR_RL(&rl, "%s: bad SSL error code %d", function, error);
521 ssl_recv(struct stream *stream, void *buffer, size_t n)
523 struct ssl_stream *sslv = ssl_stream_cast(stream);
527 /* Behavior of zero-byte SSL_read is poorly defined. */
530 old_state = SSL_get_state(sslv->ssl);
531 ret = SSL_read(sslv->ssl, buffer, n);
532 if (old_state != SSL_get_state(sslv->ssl)) {
533 sslv->tx_want = SSL_NOTHING;
535 sslv->rx_want = SSL_NOTHING;
540 int error = SSL_get_error(sslv->ssl, ret);
541 if (error == SSL_ERROR_ZERO_RETURN) {
544 return interpret_ssl_error("SSL_read", ret, error, &sslv->rx_want);
550 ssl_clear_txbuf(struct ssl_stream *sslv)
552 ofpbuf_delete(sslv->txbuf);
557 ssl_do_tx(struct stream *stream)
559 struct ssl_stream *sslv = ssl_stream_cast(stream);
562 int old_state = SSL_get_state(sslv->ssl);
563 int ret = SSL_write(sslv->ssl, sslv->txbuf->data, sslv->txbuf->size);
564 if (old_state != SSL_get_state(sslv->ssl)) {
565 sslv->rx_want = SSL_NOTHING;
567 sslv->tx_want = SSL_NOTHING;
569 ofpbuf_pull(sslv->txbuf, ret);
570 if (sslv->txbuf->size == 0) {
574 int ssl_error = SSL_get_error(sslv->ssl, ret);
575 if (ssl_error == SSL_ERROR_ZERO_RETURN) {
576 VLOG_WARN_RL(&rl, "SSL_write: connection closed");
579 return interpret_ssl_error("SSL_write", ret, ssl_error,
587 ssl_send(struct stream *stream, const void *buffer, size_t n)
589 struct ssl_stream *sslv = ssl_stream_cast(stream);
596 sslv->txbuf = ofpbuf_clone_data(buffer, n);
597 error = ssl_do_tx(stream);
600 ssl_clear_txbuf(sslv);
603 leak_checker_claim(buffer);
613 ssl_run(struct stream *stream)
615 struct ssl_stream *sslv = ssl_stream_cast(stream);
617 if (sslv->txbuf && ssl_do_tx(stream) != EAGAIN) {
618 ssl_clear_txbuf(sslv);
623 ssl_run_wait(struct stream *stream)
625 struct ssl_stream *sslv = ssl_stream_cast(stream);
627 if (sslv->tx_want != SSL_NOTHING) {
628 poll_fd_wait(sslv->fd, want_to_poll_events(sslv->tx_want));
633 ssl_wait(struct stream *stream, enum stream_wait_type wait)
635 struct ssl_stream *sslv = ssl_stream_cast(stream);
639 if (stream_connect(stream) != EAGAIN) {
640 poll_immediate_wake();
642 switch (sslv->state) {
643 case STATE_TCP_CONNECTING:
644 poll_fd_wait(sslv->fd, POLLOUT);
647 case STATE_SSL_CONNECTING:
648 /* ssl_connect() called SSL_accept() or SSL_connect(), which
649 * set up the status that we test here. */
650 poll_fd_wait(sslv->fd,
651 want_to_poll_events(SSL_want(sslv->ssl)));
661 if (sslv->rx_want != SSL_NOTHING) {
662 poll_fd_wait(sslv->fd, want_to_poll_events(sslv->rx_want));
664 poll_immediate_wake();
670 /* We have room in our tx queue. */
671 poll_immediate_wake();
673 /* stream_run_wait() will do the right thing; don't bother with
683 struct stream_class ssl_stream_class = {
686 ssl_close, /* close */
687 ssl_connect, /* connect */
691 ssl_run_wait, /* run_wait */
699 struct pstream pstream;
703 struct pstream_class pssl_pstream_class;
705 static struct pssl_pstream *
706 pssl_pstream_cast(struct pstream *pstream)
708 pstream_assert_class(pstream, &pssl_pstream_class);
709 return CONTAINER_OF(pstream, struct pssl_pstream, pstream);
713 pssl_open(const char *name UNUSED, char *suffix, struct pstream **pstreamp)
715 struct pssl_pstream *pssl;
716 struct sockaddr_in sin;
717 char bound_name[128];
726 fd = inet_open_passive(SOCK_STREAM, suffix, OFP_SSL_PORT, NULL);
730 sprintf(bound_name, "pssl:%"PRIu16":"IP_FMT,
731 ntohs(sin.sin_port), IP_ARGS(&sin.sin_addr.s_addr));
733 pssl = xmalloc(sizeof *pssl);
734 pstream_init(&pssl->pstream, &pssl_pstream_class, bound_name);
736 *pstreamp = &pssl->pstream;
741 pssl_close(struct pstream *pstream)
743 struct pssl_pstream *pssl = pssl_pstream_cast(pstream);
749 pssl_accept(struct pstream *pstream, struct stream **new_streamp)
751 struct pssl_pstream *pssl = pssl_pstream_cast(pstream);
752 struct sockaddr_in sin;
753 socklen_t sin_len = sizeof sin;
758 new_fd = accept(pssl->fd, &sin, &sin_len);
761 if (error != EAGAIN) {
762 VLOG_DBG_RL(&rl, "accept: %s", strerror(error));
767 error = set_nonblocking(new_fd);
773 sprintf(name, "ssl:"IP_FMT, IP_ARGS(&sin.sin_addr));
774 if (sin.sin_port != htons(OFP_SSL_PORT)) {
775 sprintf(strchr(name, '\0'), ":%"PRIu16, ntohs(sin.sin_port));
777 return new_ssl_stream(name, new_fd, SERVER, STATE_SSL_CONNECTING, &sin,
782 pssl_wait(struct pstream *pstream)
784 struct pssl_pstream *pssl = pssl_pstream_cast(pstream);
785 poll_fd_wait(pssl->fd, POLLIN);
788 struct pstream_class pssl_pstream_class = {
797 * Returns true if OpenSSL error is WANT_READ or WANT_WRITE, indicating that
798 * OpenSSL is requesting that we call it back when the socket is ready for read
799 * or writing, respectively.
802 ssl_wants_io(int ssl_error)
804 return (ssl_error == SSL_ERROR_WANT_WRITE
805 || ssl_error == SSL_ERROR_WANT_READ);
811 static int init_status = -1;
812 if (init_status < 0) {
813 init_status = do_ssl_init();
814 assert(init_status >= 0);
825 SSL_load_error_strings();
827 method = TLSv1_method();
828 if (method == NULL) {
829 VLOG_ERR("TLSv1_method: %s", ERR_error_string(ERR_get_error(), NULL));
833 ctx = SSL_CTX_new(method);
835 VLOG_ERR("SSL_CTX_new: %s", ERR_error_string(ERR_get_error(), NULL));
838 SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
839 SSL_CTX_set_tmp_dh_callback(ctx, tmp_dh_callback);
840 SSL_CTX_set_mode(ctx, SSL_MODE_ENABLE_PARTIAL_WRITE);
841 SSL_CTX_set_mode(ctx, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
842 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT,
849 tmp_dh_callback(SSL *ssl UNUSED, int is_export UNUSED, int keylength)
854 DH *(*constructor)(void);
857 static struct dh dh_table[] = {
858 {1024, NULL, get_dh1024},
859 {2048, NULL, get_dh2048},
860 {4096, NULL, get_dh4096},
865 for (dh = dh_table; dh < &dh_table[ARRAY_SIZE(dh_table)]; dh++) {
866 if (dh->keylength == keylength) {
868 dh->dh = dh->constructor();
870 ovs_fatal(ENOMEM, "out of memory constructing "
871 "Diffie-Hellman parameters");
877 VLOG_ERR_RL(&rl, "no Diffie-Hellman parameters for key length %d",
882 /* Returns true if SSL is at least partially configured. */
884 stream_ssl_is_configured(void)
886 return has_private_key || has_certificate || has_ca_cert;
890 stream_ssl_set_private_key_file(const char *file_name)
895 if (SSL_CTX_use_PrivateKey_file(ctx, file_name, SSL_FILETYPE_PEM) != 1) {
896 VLOG_ERR("SSL_use_PrivateKey_file: %s",
897 ERR_error_string(ERR_get_error(), NULL));
900 has_private_key = true;
904 stream_ssl_set_certificate_file(const char *file_name)
909 if (SSL_CTX_use_certificate_chain_file(ctx, file_name) != 1) {
910 VLOG_ERR("SSL_use_certificate_file: %s",
911 ERR_error_string(ERR_get_error(), NULL));
914 has_certificate = true;
917 /* Reads the X509 certificate or certificates in file 'file_name'. On success,
918 * stores the address of the first element in an array of pointers to
919 * certificates in '*certs' and the number of certificates in the array in
920 * '*n_certs', and returns 0. On failure, stores a null pointer in '*certs', 0
921 * in '*n_certs', and returns a positive errno value.
923 * The caller is responsible for freeing '*certs'. */
925 read_cert_file(const char *file_name, X509 ***certs, size_t *n_certs)
928 size_t allocated_certs = 0;
933 file = fopen(file_name, "r");
935 VLOG_ERR("failed to open %s for reading: %s",
936 file_name, strerror(errno));
944 /* Read certificate from file. */
945 certificate = PEM_read_X509(file, NULL, NULL, NULL);
949 VLOG_ERR("PEM_read_X509 failed reading %s: %s",
950 file_name, ERR_error_string(ERR_get_error(), NULL));
951 for (i = 0; i < *n_certs; i++) {
952 X509_free((*certs)[i]);
960 /* Add certificate to array. */
961 if (*n_certs >= allocated_certs) {
962 *certs = x2nrealloc(*certs, &allocated_certs, sizeof **certs);
964 (*certs)[(*n_certs)++] = certificate;
966 /* Are there additional certificates in the file? */
969 } while (isspace(c));
980 /* Sets 'file_name' as the name of a file containing one or more X509
981 * certificates to send to the peer. Typical use in OpenFlow is to send the CA
982 * certificate to the peer, which enables a switch to pick up the controller's
983 * CA certificate on its first connection. */
985 stream_ssl_set_peer_ca_cert_file(const char *file_name)
995 if (!read_cert_file(file_name, &certs, &n_certs)) {
996 for (i = 0; i < n_certs; i++) {
997 if (SSL_CTX_add_extra_chain_cert(ctx, certs[i]) != 1) {
998 VLOG_ERR("SSL_CTX_add_extra_chain_cert: %s",
999 ERR_error_string(ERR_get_error(), NULL));
1006 /* Logs fingerprint of CA certificate 'cert' obtained from 'file_name'. */
1008 log_ca_cert(const char *file_name, X509 *cert)
1010 unsigned char digest[EVP_MAX_MD_SIZE];
1011 unsigned int n_bytes;
1016 if (!X509_digest(cert, EVP_sha1(), digest, &n_bytes)) {
1017 ds_put_cstr(&fp, "<out of memory>");
1020 for (i = 0; i < n_bytes; i++) {
1022 ds_put_char(&fp, ':');
1024 ds_put_format(&fp, "%02hhx", digest[i]);
1027 subject = X509_NAME_oneline(X509_get_subject_name(cert), NULL, 0);
1028 VLOG_INFO("Trusting CA cert from %s (%s) (fingerprint %s)", file_name,
1029 subject ? subject : "<out of memory>", ds_cstr(&fp));
1034 /* Sets 'file_name' as the name of the file from which to read the CA
1035 * certificate used to verify the peer within SSL connections. If 'bootstrap'
1036 * is false, the file must exist. If 'bootstrap' is false, then the file is
1037 * read if it is exists; if it does not, then it will be created from the CA
1038 * certificate received from the peer on the first SSL connection. */
1040 stream_ssl_set_ca_cert_file(const char *file_name, bool bootstrap)
1050 if (bootstrap && stat(file_name, &s) && errno == ENOENT) {
1051 bootstrap_ca_cert = true;
1052 ca_cert_file = xstrdup(file_name);
1053 } else if (!read_cert_file(file_name, &certs, &n_certs)) {
1056 /* Set up list of CAs that the server will accept from the client. */
1057 for (i = 0; i < n_certs; i++) {
1058 /* SSL_CTX_add_client_CA makes a copy of the relevant data. */
1059 if (SSL_CTX_add_client_CA(ctx, certs[i]) != 1) {
1060 VLOG_ERR("failed to add client certificate %d from %s: %s",
1062 ERR_error_string(ERR_get_error(), NULL));
1064 log_ca_cert(file_name, certs[i]);
1066 X509_free(certs[i]);
1069 /* Set up CAs for OpenSSL to trust in verifying the peer's
1071 if (SSL_CTX_load_verify_locations(ctx, file_name, NULL) != 1) {
1072 VLOG_ERR("SSL_CTX_load_verify_locations: %s",
1073 ERR_error_string(ERR_get_error(), NULL));