X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=lib%2Fvconn-ssl.c;h=383714af47bb8bde4d341a30d606e416fecbab9e;hb=5d69c233557908e25f25acaa8d21da10de1a2868;hp=a7060d74bb9a91e4f1bd7c80829437a9b4132a1a;hpb=d838ee2e03256bb3b116de6ed05548011ed97728;p=sliver-openvswitch.git diff --git a/lib/vconn-ssl.c b/lib/vconn-ssl.c index a7060d74b..383714af4 100644 --- a/lib/vconn-ssl.c +++ b/lib/vconn-ssl.c @@ -31,25 +31,31 @@ * derivatives without specific, written prior permission. */ +#include #include "vconn-ssl.h" #include "dhparams.h" #include +#include #include #include #include #include #include #include +#include #include +#include +#include #include -#include "buffer.h" -#include "socket-util.h" -#include "util.h" -#include "openflow.h" +#include "dynamic-string.h" +#include "ofpbuf.h" +#include "openflow/openflow.h" #include "packets.h" #include "poll-loop.h" -#include "ofp-print.h" #include "socket-util.h" +#include "socket-util.h" +#include "util.h" +#include "vconn-provider.h" #include "vconn.h" #include "vlog.h" @@ -75,8 +81,8 @@ struct ssl_vconn enum session_type type; int fd; SSL *ssl; - struct buffer *rxbuf; - struct buffer *txbuf; + struct ofpbuf *rxbuf; + struct ofpbuf *txbuf; struct poll_waiter *tx_waiter; /* rx_want and tx_want record the result of the last call to SSL_read() @@ -144,14 +150,32 @@ static SSL_CTX *ctx; /* Required configuration. */ static bool has_private_key, has_certificate, has_ca_cert; +/* Ordinarily, we require a CA certificate for the peer to be locally + * available. 'has_ca_cert' is true when this is the case, and neither of the + * following variables matter. + * + * We can, however, bootstrap the CA certificate from the peer at the beginning + * of our first connection then use that certificate on all subsequent + * connections, saving it to a file for use in future runs also. In this case, + * 'has_ca_cert' is false, 'bootstrap_ca_cert' is true, and 'ca_cert_file' + * names the file to be saved. */ +static bool bootstrap_ca_cert; +static char *ca_cert_file; + +/* Who knows what can trigger various SSL errors, so let's throttle them down + * quite a bit. */ +static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(10, 25); + static int ssl_init(void); static int do_ssl_init(void); static bool ssl_wants_io(int ssl_error); static void ssl_close(struct vconn *); +static void ssl_clear_txbuf(struct ssl_vconn *); static int interpret_ssl_error(const char *function, int ret, int error, int *want); static void ssl_tx_poll_callback(int fd, short int revents, void *vconn_); static DH *tmp_dh_callback(SSL *ssl, int is_export UNUSED, int keylength); +static void log_ca_cert(const char *file_name, X509 *cert); short int want_to_poll_events(int want) @@ -190,12 +214,13 @@ new_ssl_vconn(const char *name, int fd, enum session_type type, VLOG_ERR("Certificate must be configured to use SSL"); goto error; } - if (!has_ca_cert) { + if (!has_ca_cert && !bootstrap_ca_cert) { VLOG_ERR("CA certificate must be configured to use SSL"); goto error; } if (!SSL_CTX_check_private_key(ctx)) { - VLOG_ERR("Private key does not match certificate public key"); + VLOG_ERR("Private key does not match certificate public key: %s", + ERR_error_string(ERR_get_error(), NULL)); goto error; } @@ -218,12 +243,14 @@ new_ssl_vconn(const char *name, int fd, enum session_type type, VLOG_ERR("SSL_set_fd: %s", ERR_error_string(ERR_get_error(), NULL)); goto error; } + if (bootstrap_ca_cert && type == CLIENT) { + SSL_set_verify(ssl, SSL_VERIFY_NONE, NULL); + } /* Create and return the ssl_vconn. */ sslv = xmalloc(sizeof *sslv); - sslv->vconn.class = &ssl_vconn_class; - sslv->vconn.connect_status = EAGAIN; - sslv->vconn.ip = sin->sin_addr.s_addr; + vconn_init(&sslv->vconn, &ssl_vconn_class, EAGAIN, sin->sin_addr.s_addr, + name); sslv->state = state; sslv->type = type; sslv->fd = fd; @@ -246,7 +273,7 @@ error: static struct ssl_vconn * ssl_vconn_cast(struct vconn *vconn) { - assert(vconn->class == &ssl_vconn_class); + vconn_assert_class(vconn, &ssl_vconn_class); return CONTAINER_OF(vconn, struct ssl_vconn, vconn); } @@ -270,7 +297,7 @@ ssl_open(const char *name, char *suffix, struct vconn **vconnp) host_name = strtok_r(suffix, "::", &save_ptr); port_string = strtok_r(NULL, "::", &save_ptr); if (!host_name) { - error(0, "%s: bad peer name format", name); + ofp_error(0, "%s: bad peer name format", name); return EAFNOSUPPORT; } @@ -312,6 +339,93 @@ ssl_open(const char *name, char *suffix, struct vconn **vconnp) } } +static int +do_ca_cert_bootstrap(struct vconn *vconn) +{ + struct ssl_vconn *sslv = ssl_vconn_cast(vconn); + STACK_OF(X509) *chain; + X509 *ca_cert; + FILE *file; + int error; + int fd; + + chain = SSL_get_peer_cert_chain(sslv->ssl); + if (!chain || !sk_X509_num(chain)) { + VLOG_ERR("could not bootstrap CA cert: no certificate presented by " + "peer"); + return EPROTO; + } + ca_cert = sk_X509_value(chain, sk_X509_num(chain) - 1); + + /* Check that 'ca_cert' is self-signed. Otherwise it is not a CA + * certificate and we should not attempt to use it as one. */ + error = X509_check_issued(ca_cert, ca_cert); + if (error) { + VLOG_ERR("could not bootstrap CA cert: obtained certificate is " + "not self-signed (%s)", + X509_verify_cert_error_string(error)); + if (sk_X509_num(chain) < 2) { + VLOG_ERR("only one certificate was received, so probably the peer " + "is not configured to send its CA certificate"); + } + return EPROTO; + } + + fd = open(ca_cert_file, O_CREAT | O_EXCL | O_WRONLY, 0444); + if (fd < 0) { + VLOG_ERR("could not bootstrap CA cert: creating %s failed: %s", + ca_cert_file, strerror(errno)); + return errno; + } + + file = fdopen(fd, "w"); + if (!file) { + int error = errno; + VLOG_ERR("could not bootstrap CA cert: fdopen failed: %s", + strerror(error)); + unlink(ca_cert_file); + return error; + } + + if (!PEM_write_X509(file, ca_cert)) { + VLOG_ERR("could not bootstrap CA cert: PEM_write_X509 to %s failed: " + "%s", ca_cert_file, ERR_error_string(ERR_get_error(), NULL)); + fclose(file); + unlink(ca_cert_file); + return EIO; + } + + if (fclose(file)) { + int error = errno; + VLOG_ERR("could not bootstrap CA cert: writing %s failed: %s", + ca_cert_file, strerror(error)); + unlink(ca_cert_file); + return error; + } + + VLOG_WARN("successfully bootstrapped CA cert to %s", ca_cert_file); + log_ca_cert(ca_cert_file, ca_cert); + bootstrap_ca_cert = false; + has_ca_cert = true; + + /* SSL_CTX_add_client_CA makes a copy of ca_cert's relevant data. */ + SSL_CTX_add_client_CA(ctx, ca_cert); + + /* SSL_CTX_use_certificate() takes ownership of the certificate passed in. + * 'ca_cert' is owned by sslv->ssl, so we need to duplicate it. */ + ca_cert = X509_dup(ca_cert); + if (!ca_cert) { + out_of_memory(); + } + if (SSL_CTX_load_verify_locations(ctx, ca_cert_file, NULL) != 1) { + VLOG_ERR("SSL_CTX_load_verify_locations: %s", + ERR_error_string(ERR_get_error(), NULL)); + return EPROTO; + } + VLOG_WARN("killing successful connection to retry using CA cert"); + return EPROTO; +} + static int ssl_connect(struct vconn *vconn) { @@ -341,6 +455,21 @@ ssl_connect(struct vconn *vconn) shutdown(sslv->fd, SHUT_RDWR); return EPROTO; } + } else if (bootstrap_ca_cert) { + return do_ca_cert_bootstrap(vconn); + } else if ((SSL_get_verify_mode(sslv->ssl) + & (SSL_VERIFY_NONE | SSL_VERIFY_PEER)) + != SSL_VERIFY_PEER) { + /* Two or more SSL connections completed at the same time while we + * were in bootstrap mode. Only one of these can finish the + * bootstrap successfully. The other one(s) must be rejected + * because they were not verified against the bootstrapped CA + * certificate. (Alternatively we could verify them against the CA + * certificate, but that's more trouble than it's worth. These + * connections will succeed the next time they retry, assuming that + * they have a certificate against the correct CA.) */ + VLOG_ERR("rejecting SSL connection during bootstrap race window"); + return EPROTO; } else { return 0; } @@ -354,6 +483,8 @@ ssl_close(struct vconn *vconn) { struct ssl_vconn *sslv = ssl_vconn_cast(vconn); poll_cancel(sslv->tx_waiter); + ssl_clear_txbuf(sslv); + ofpbuf_delete(sslv->rxbuf); SSL_free(sslv->ssl); close(sslv->fd); free(sslv); @@ -367,11 +498,11 @@ interpret_ssl_error(const char *function, int ret, int error, switch (error) { case SSL_ERROR_NONE: - VLOG_ERR("%s: unexpected SSL_ERROR_NONE", function); + VLOG_ERR_RL(&rl, "%s: unexpected SSL_ERROR_NONE", function); break; case SSL_ERROR_ZERO_RETURN: - VLOG_ERR("%s: unexpected SSL_ERROR_ZERO_RETURN", function); + VLOG_ERR_RL(&rl, "%s: unexpected SSL_ERROR_ZERO_RETURN", function); break; case SSL_ERROR_WANT_READ: @@ -383,15 +514,16 @@ interpret_ssl_error(const char *function, int ret, int error, return EAGAIN; case SSL_ERROR_WANT_CONNECT: - VLOG_ERR("%s: unexpected SSL_ERROR_WANT_CONNECT", function); + VLOG_ERR_RL(&rl, "%s: unexpected SSL_ERROR_WANT_CONNECT", function); break; case SSL_ERROR_WANT_ACCEPT: - VLOG_ERR("%s: unexpected SSL_ERROR_WANT_ACCEPT", function); + VLOG_ERR_RL(&rl, "%s: unexpected SSL_ERROR_WANT_ACCEPT", function); break; case SSL_ERROR_WANT_X509_LOOKUP: - VLOG_ERR("%s: unexpected SSL_ERROR_WANT_X509_LOOKUP", function); + VLOG_ERR_RL(&rl, "%s: unexpected SSL_ERROR_WANT_X509_LOOKUP", + function); break; case SSL_ERROR_SYSCALL: { @@ -399,14 +531,17 @@ interpret_ssl_error(const char *function, int ret, int error, if (queued_error == 0) { if (ret < 0) { int status = errno; - VLOG_WARN("%s: system error (%s)", function, strerror(status)); + VLOG_WARN_RL(&rl, "%s: system error (%s)", + function, strerror(status)); return status; } else { - VLOG_WARN("%s: unexpected SSL connection close", function); + VLOG_WARN_RL(&rl, "%s: unexpected SSL connection close", + function); return EPROTO; } } else { - VLOG_DBG("%s: %s", function, ERR_error_string(queued_error, NULL)); + VLOG_WARN_RL(&rl, "%s: %s", + function, ERR_error_string(queued_error, NULL)); break; } } @@ -414,31 +549,33 @@ interpret_ssl_error(const char *function, int ret, int error, case SSL_ERROR_SSL: { int queued_error = ERR_get_error(); if (queued_error != 0) { - VLOG_DBG("%s: %s", function, ERR_error_string(queued_error, NULL)); + VLOG_WARN_RL(&rl, "%s: %s", + function, ERR_error_string(queued_error, NULL)); } else { - VLOG_ERR("%s: SSL_ERROR_SSL without queued error", function); + VLOG_ERR_RL(&rl, "%s: SSL_ERROR_SSL without queued error", + function); } break; } default: - VLOG_ERR("%s: bad SSL error code %d", function, error); + VLOG_ERR_RL(&rl, "%s: bad SSL error code %d", function, error); break; } return EIO; } static int -ssl_recv(struct vconn *vconn, struct buffer **bufferp) +ssl_recv(struct vconn *vconn, struct ofpbuf **bufferp) { struct ssl_vconn *sslv = ssl_vconn_cast(vconn); - struct buffer *rx; + struct ofpbuf *rx; size_t want_bytes; int old_state; ssize_t ret; if (sslv->rxbuf == NULL) { - sslv->rxbuf = buffer_new(1564); + sslv->rxbuf = ofpbuf_new(1564); } rx = sslv->rxbuf; @@ -449,7 +586,8 @@ again: struct ofp_header *oh = rx->data; size_t length = ntohs(oh->length); if (length < sizeof(struct ofp_header)) { - VLOG_ERR("received too-short ofp_header (%zu bytes)", length); + VLOG_ERR_RL(&rl, "received too-short ofp_header (%zu bytes)", + length); return EPROTO; } want_bytes = length - rx->size; @@ -459,13 +597,13 @@ again: return 0; } } - buffer_prealloc_tailroom(rx, want_bytes); + ofpbuf_prealloc_tailroom(rx, want_bytes); /* Behavior of zero-byte SSL_read is poorly defined. */ assert(want_bytes > 0); old_state = SSL_get_state(sslv->ssl); - ret = SSL_read(sslv->ssl, buffer_tail(rx), want_bytes); + ret = SSL_read(sslv->ssl, ofpbuf_tail(rx), want_bytes); if (old_state != SSL_get_state(sslv->ssl)) { sslv->tx_want = SSL_NOTHING; if (sslv->tx_waiter) { @@ -492,7 +630,7 @@ again: if (error == SSL_ERROR_ZERO_RETURN) { /* Connection closed (EOF). */ if (rx->size) { - VLOG_WARN("SSL_read: unexpected connection close"); + VLOG_WARN_RL(&rl, "SSL_read: unexpected connection close"); return EPROTO; } else { return EOF; @@ -506,7 +644,7 @@ again: static void ssl_clear_txbuf(struct ssl_vconn *sslv) { - buffer_delete(sslv->txbuf); + ofpbuf_delete(sslv->txbuf); sslv->txbuf = NULL; sslv->tx_waiter = NULL; } @@ -533,14 +671,14 @@ ssl_do_tx(struct vconn *vconn) } sslv->tx_want = SSL_NOTHING; if (ret > 0) { - buffer_pull(sslv->txbuf, ret); + ofpbuf_pull(sslv->txbuf, ret); if (sslv->txbuf->size == 0) { return 0; } } else { int ssl_error = SSL_get_error(sslv->ssl, ret); if (ssl_error == SSL_ERROR_ZERO_RETURN) { - VLOG_WARN("SSL_write: connection closed"); + VLOG_WARN_RL(&rl, "SSL_write: connection closed"); return EPIPE; } else { return interpret_ssl_error("SSL_write", ret, ssl_error, @@ -564,7 +702,7 @@ ssl_tx_poll_callback(int fd UNUSED, short int revents UNUSED, void *vconn_) } static int -ssl_send(struct vconn *vconn, struct buffer *buffer) +ssl_send(struct vconn *vconn, struct ofpbuf *buffer) { struct ssl_vconn *sslv = ssl_vconn_cast(vconn); @@ -640,35 +778,37 @@ ssl_wait(struct vconn *vconn, enum vconn_wait_type wait) } struct vconn_class ssl_vconn_class = { - .name = "ssl", - .open = ssl_open, - .close = ssl_close, - .connect = ssl_connect, - .recv = ssl_recv, - .send = ssl_send, - .wait = ssl_wait, + "ssl", /* name */ + ssl_open, /* open */ + ssl_close, /* close */ + ssl_connect, /* connect */ + ssl_recv, /* recv */ + ssl_send, /* send */ + ssl_wait, /* wait */ }; /* Passive SSL. */ -struct pssl_vconn +struct pssl_pvconn { - struct vconn vconn; + struct pvconn pvconn; int fd; }; -static struct pssl_vconn * -pssl_vconn_cast(struct vconn *vconn) +struct pvconn_class pssl_pvconn_class; + +static struct pssl_pvconn * +pssl_pvconn_cast(struct pvconn *pvconn) { - assert(vconn->class == &pssl_vconn_class); - return CONTAINER_OF(vconn, struct pssl_vconn, vconn); + pvconn_assert_class(pvconn, &pssl_pvconn_class); + return CONTAINER_OF(pvconn, struct pssl_pvconn, pvconn); } static int -pssl_open(const char *name, char *suffix, struct vconn **vconnp) +pssl_open(const char *name, char *suffix, struct pvconn **pvconnp) { struct sockaddr_in sin; - struct pssl_vconn *pssl; + struct pssl_pvconn *pssl; int retval; int fd; unsigned int yes = 1; @@ -719,25 +859,24 @@ pssl_open(const char *name, char *suffix, struct vconn **vconnp) } pssl = xmalloc(sizeof *pssl); - pssl->vconn.class = &pssl_vconn_class; - pssl->vconn.connect_status = 0; + pvconn_init(&pssl->pvconn, &pssl_pvconn_class, name); pssl->fd = fd; - *vconnp = &pssl->vconn; + *pvconnp = &pssl->pvconn; return 0; } static void -pssl_close(struct vconn *vconn) +pssl_close(struct pvconn *pvconn) { - struct pssl_vconn *pssl = pssl_vconn_cast(vconn); + struct pssl_pvconn *pssl = pssl_pvconn_cast(pvconn); close(pssl->fd); free(pssl); } static int -pssl_accept(struct vconn *vconn, struct vconn **new_vconnp) +pssl_accept(struct pvconn *pvconn, struct vconn **new_vconnp) { - struct pssl_vconn *pssl = pssl_vconn_cast(vconn); + struct pssl_pvconn *pssl = pssl_pvconn_cast(pvconn); struct sockaddr_in sin; socklen_t sin_len = sizeof sin; char name[128]; @@ -748,7 +887,7 @@ pssl_accept(struct vconn *vconn, struct vconn **new_vconnp) if (new_fd < 0) { int error = errno; if (error != EAGAIN) { - VLOG_DBG("accept: %s", strerror(error)); + VLOG_DBG_RL(&rl, "accept: %s", strerror(error)); } return error; } @@ -768,19 +907,18 @@ pssl_accept(struct vconn *vconn, struct vconn **new_vconnp) } static void -pssl_wait(struct vconn *vconn, enum vconn_wait_type wait) +pssl_wait(struct pvconn *pvconn) { - struct pssl_vconn *pssl = pssl_vconn_cast(vconn); - assert(wait == WAIT_ACCEPT); + struct pssl_pvconn *pssl = pssl_pvconn_cast(pvconn); poll_fd_wait(pssl->fd, POLLIN); } -struct vconn_class pssl_vconn_class = { - .name = "pssl", - .open = pssl_open, - .close = pssl_close, - .accept = pssl_accept, - .wait = pssl_wait, +struct pvconn_class pssl_pvconn_class = { + "pssl", + pssl_open, + pssl_close, + pssl_accept, + pssl_wait, }; /* @@ -857,14 +995,15 @@ tmp_dh_callback(SSL *ssl, int is_export UNUSED, int keylength) if (!dh->dh) { dh->dh = dh->constructor(); if (!dh->dh) { - fatal(ENOMEM, "out of memory constructing " - "Diffie-Hellman parameters"); + ofp_fatal(ENOMEM, "out of memory constructing " + "Diffie-Hellman parameters"); } } return dh->dh; } } - VLOG_ERR("no Diffie-Hellman parameters for key length %d", keylength); + VLOG_ERR_RL(&rl, "no Diffie-Hellman parameters for key length %d", + keylength); return NULL; } @@ -903,30 +1042,167 @@ vconn_ssl_set_certificate_file(const char *file_name) has_certificate = true; } +/* Reads the X509 certificate or certificates in file 'file_name'. On success, + * stores the address of the first element in an array of pointers to + * certificates in '*certs' and the number of certificates in the array in + * '*n_certs', and returns 0. On failure, stores a null pointer in '*certs', 0 + * in '*n_certs', and returns a positive errno value. + * + * The caller is responsible for freeing '*certs'. */ +int +read_cert_file(const char *file_name, X509 ***certs, size_t *n_certs) +{ + FILE *file; + size_t allocated_certs = 0; + + *certs = NULL; + *n_certs = 0; + + file = fopen(file_name, "r"); + if (!file) { + VLOG_ERR("failed to open %s for reading: %s", + file_name, strerror(errno)); + return errno; + } + + for (;;) { + X509 *certificate; + int c; + + /* Read certificate from file. */ + certificate = PEM_read_X509(file, NULL, NULL, NULL); + if (!certificate) { + size_t i; + + VLOG_ERR("PEM_read_X509 failed reading %s: %s", + file_name, ERR_error_string(ERR_get_error(), NULL)); + for (i = 0; i < *n_certs; i++) { + X509_free((*certs)[i]); + } + free(*certs); + *certs = NULL; + *n_certs = 0; + return EIO; + } + + /* Add certificate to array. */ + if (*n_certs >= allocated_certs) { + allocated_certs = 1 + 2 * allocated_certs; + *certs = xrealloc(*certs, sizeof *certs * allocated_certs); + } + (*certs)[(*n_certs)++] = certificate; + + /* Are there additional certificates in the file? */ + do { + c = getc(file); + } while (isspace(c)); + if (c == EOF) { + break; + } + ungetc(c, file); + } + fclose(file); + return 0; +} + + +/* Sets 'file_name' as the name of a file containing one or more X509 + * certificates to send to the peer. Typical use in OpenFlow is to send the CA + * certificate to the peer, which enables a switch to pick up the controller's + * CA certificate on its first connection. */ void -vconn_ssl_set_ca_cert_file(const char *file_name) +vconn_ssl_set_peer_ca_cert_file(const char *file_name) { - STACK_OF(X509_NAME) *ca_list; + X509 **certs; + size_t n_certs; + size_t i; if (ssl_init()) { return; } - /* Set up list of CAs that the server will accept from the client. */ - ca_list = SSL_load_client_CA_file(file_name); - if (ca_list == NULL) { - VLOG_ERR("SSL_load_client_CA_file: %s", - ERR_error_string(ERR_get_error(), NULL)); - return; + if (!read_cert_file(file_name, &certs, &n_certs)) { + for (i = 0; i < n_certs; i++) { + if (SSL_CTX_add_extra_chain_cert(ctx, certs[i]) != 1) { + VLOG_ERR("SSL_CTX_add_extra_chain_cert: %s", + ERR_error_string(ERR_get_error(), NULL)); + } + } + free(certs); } - SSL_CTX_set_client_CA_list(ctx, ca_list); +} - /* Set up CAs for OpenSSL to trust in verifying the peer's certificate. */ - if (SSL_CTX_load_verify_locations(ctx, file_name, NULL) != 1) { - VLOG_ERR("SSL_CTX_load_verify_locations: %s", - ERR_error_string(ERR_get_error(), NULL)); +/* Logs fingerprint of CA certificate 'cert' obtained from 'file_name'. */ +static void +log_ca_cert(const char *file_name, X509 *cert) +{ + unsigned char digest[EVP_MAX_MD_SIZE]; + unsigned int n_bytes; + struct ds fp; + char *subject; + + ds_init(&fp); + if (!X509_digest(cert, EVP_sha1(), digest, &n_bytes)) { + ds_put_cstr(&fp, ""); + } else { + unsigned int i; + for (i = 0; i < n_bytes; i++) { + if (i) { + ds_put_char(&fp, ':'); + } + ds_put_format(&fp, "%02hhx", digest[i]); + } + } + subject = X509_NAME_oneline(X509_get_subject_name(cert), NULL, 0); + VLOG_WARN("Trusting CA cert from %s (%s) (fingerprint %s)", file_name, + subject ? subject : "", ds_cstr(&fp)); + free(subject); + ds_destroy(&fp); +} + +/* Sets 'file_name' as the name of the file from which to read the CA + * certificate used to verify the peer within SSL connections. If 'bootstrap' + * is false, the file must exist. If 'bootstrap' is false, then the file is + * read if it is exists; if it does not, then it will be created from the CA + * certificate received from the peer on the first SSL connection. */ +void +vconn_ssl_set_ca_cert_file(const char *file_name, bool bootstrap) +{ + X509 **certs; + size_t n_certs; + struct stat s; + + if (ssl_init()) { return; } - has_ca_cert = true; + if (bootstrap && stat(file_name, &s) && errno == ENOENT) { + bootstrap_ca_cert = true; + ca_cert_file = xstrdup(file_name); + } else if (!read_cert_file(file_name, &certs, &n_certs)) { + size_t i; + + /* Set up list of CAs that the server will accept from the client. */ + for (i = 0; i < n_certs; i++) { + /* SSL_CTX_add_client_CA makes a copy of the relevant data. */ + if (SSL_CTX_add_client_CA(ctx, certs[i]) != 1) { + VLOG_ERR("failed to add client certificate %d from %s: %s", + i, file_name, + ERR_error_string(ERR_get_error(), NULL)); + } else { + log_ca_cert(file_name, certs[i]); + } + X509_free(certs[i]); + } + + /* Set up CAs for OpenSSL to trust in verifying the peer's + * certificate. */ + if (SSL_CTX_load_verify_locations(ctx, file_name, NULL) != 1) { + VLOG_ERR("SSL_CTX_load_verify_locations: %s", + ERR_error_string(ERR_get_error(), NULL)); + return; + } + + has_ca_cert = true; + } }