lavf: split tls.c

Move the OpenSSL and GnuTLS implementations to their own files. Other
than the connection code (including options) and some boilerplate, no
code is actually shared.

Signed-off-by: Martin Storsjö <martin@martin.st>

1 files changed, 228 insertions, 0 deletions

diff --git a/libavformat/tls_gnutls.c b/libavformat/tls_gnutls.c
new file mode 100644
index 0000000000..e8037fa44e
--- /dev/null
+++ b/libavformat/tls_gnutls.c
@@ -0,0 +1,228 @@
+/*
+ * TLS/SSL Protocol
+ * Copyright (c) 2011 Martin Storsjo
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <gnutls/gnutls.h>
+#include <gnutls/x509.h>
+
+#include "avformat.h"
+#include "internal.h"
+#include "network.h"
+#include "os_support.h"
+#include "url.h"
+#include "tls.h"
+#include "libavutil/avstring.h"
+#include "libavutil/opt.h"
+#include "libavutil/parseutils.h"
+
+typedef struct TLSContext {
+    const AVClass *class;
+    TLSShared tls_shared;
+    gnutls_session_t session;
+    gnutls_certificate_credentials_t cred;
+    int need_shutdown;
+} TLSContext;
+
+static int print_tls_error(URLContext *h, int ret)
+{
+    switch (ret) {
+    case GNUTLS_E_AGAIN:
+    case GNUTLS_E_INTERRUPTED:
+        break;
+    case GNUTLS_E_WARNING_ALERT_RECEIVED:
+        av_log(h, AV_LOG_WARNING, "%s\n", gnutls_strerror(ret));
+        break;
+    default:
+        av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret));
+        break;
+    }
+    return AVERROR(EIO);
+}
+
+static int tls_close(URLContext *h)
+{
+    TLSContext *c = h->priv_data;
+    if (c->need_shutdown)
+        gnutls_bye(c->session, GNUTLS_SHUT_RDWR);
+    if (c->session)
+        gnutls_deinit(c->session);
+    if (c->cred)
+        gnutls_certificate_free_credentials(c->cred);
+    if (c->tls_shared.tcp)
+        ffurl_close(c->tls_shared.tcp);
+    ff_tls_deinit();
+    return 0;
+}
+
+static ssize_t gnutls_url_pull(gnutls_transport_ptr_t transport,
+                               void *buf, size_t len)
+{
+    URLContext *h = (URLContext*) transport;
+    int ret = ffurl_read(h, buf, len);
+    if (ret >= 0)
+        return ret;
+    if (ret == AVERROR_EXIT)
+        return 0;
+    errno = EIO;
+    return -1;
+}
+
+static ssize_t gnutls_url_push(gnutls_transport_ptr_t transport,
+                               const void *buf, size_t len)
+{
+    URLContext *h = (URLContext*) transport;
+    int ret = ffurl_write(h, buf, len);
+    if (ret >= 0)
+        return ret;
+    if (ret == AVERROR_EXIT)
+        return 0;
+    errno = EIO;
+    return -1;
+}
+
+static int tls_open(URLContext *h, const char *uri, int flags, AVDictionary **options)
+{
+    TLSContext *p = h->priv_data;
+    TLSShared *c = &p->tls_shared;
+    int ret;
+
+    ff_tls_init();
+
+    if ((ret = ff_tls_open_underlying(c, h, uri, options)) < 0)
+        goto fail;
+
+    gnutls_init(&p->session, c->listen ? GNUTLS_SERVER : GNUTLS_CLIENT);
+    if (!c->listen && !c->numerichost)
+        gnutls_server_name_set(p->session, GNUTLS_NAME_DNS, c->host, strlen(c->host));
+    gnutls_certificate_allocate_credentials(&p->cred);
+    if (c->ca_file)
+        gnutls_certificate_set_x509_trust_file(p->cred, c->ca_file, GNUTLS_X509_FMT_PEM);
+#if GNUTLS_VERSION_MAJOR >= 3
+    else
+        gnutls_certificate_set_x509_system_trust(p->cred);
+#endif
+    gnutls_certificate_set_verify_flags(p->cred, c->verify ?
+                                        GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT : 0);
+    if (c->cert_file && c->key_file) {
+        ret = gnutls_certificate_set_x509_key_file(p->cred,
+                                                   c->cert_file, c->key_file,
+                                                   GNUTLS_X509_FMT_PEM);
+        if (ret < 0) {
+            av_log(h, AV_LOG_ERROR,
+                   "Unable to set cert/key files %s and %s: %s\n",
+                   c->cert_file, c->key_file, gnutls_strerror(ret));
+            ret = AVERROR(EIO);
+            goto fail;
+        }
+    }
+    gnutls_credentials_set(p->session, GNUTLS_CRD_CERTIFICATE, p->cred);
+    gnutls_transport_set_pull_function(p->session, gnutls_url_pull);
+    gnutls_transport_set_push_function(p->session, gnutls_url_push);
+    gnutls_transport_set_ptr(p->session, c->tcp);
+    gnutls_priority_set_direct(p->session, "NORMAL", NULL);
+    ret = gnutls_handshake(p->session);
+    if (ret) {
+        ret = print_tls_error(h, ret);
+        goto fail;
+    }
+    p->need_shutdown = 1;
+    if (c->verify) {
+        unsigned int status, cert_list_size;
+        gnutls_x509_crt_t cert;
+        const gnutls_datum_t *cert_list;
+        if ((ret = gnutls_certificate_verify_peers2(p->session, &status)) < 0) {
+            av_log(h, AV_LOG_ERROR, "Unable to verify peer certificate: %s\n",
+                                    gnutls_strerror(ret));
+            ret = AVERROR(EIO);
+            goto fail;
+        }
+        if (status & GNUTLS_CERT_INVALID) {
+            av_log(h, AV_LOG_ERROR, "Peer certificate failed verification\n");
+            ret = AVERROR(EIO);
+            goto fail;
+        }
+        if (gnutls_certificate_type_get(p->session) != GNUTLS_CRT_X509) {
+            av_log(h, AV_LOG_ERROR, "Unsupported certificate type\n");
+            ret = AVERROR(EIO);
+            goto fail;
+        }
+        gnutls_x509_crt_init(&cert);
+        cert_list = gnutls_certificate_get_peers(p->session, &cert_list_size);
+        gnutls_x509_crt_import(cert, cert_list, GNUTLS_X509_FMT_DER);
+        ret = gnutls_x509_crt_check_hostname(cert, c->host);
+        gnutls_x509_crt_deinit(cert);
+        if (!ret) {
+            av_log(h, AV_LOG_ERROR,
+                   "The certificate's owner does not match hostname %s\n", c->host);
+            ret = AVERROR(EIO);
+            goto fail;
+        }
+    }
+
+    return 0;
+fail:
+    tls_close(h);
+    return ret;
+}
+
+static int tls_read(URLContext *h, uint8_t *buf, int size)
+{
+    TLSContext *c = h->priv_data;
+    int ret = gnutls_record_recv(c->session, buf, size);
+    if (ret > 0)
+        return ret;
+    if (ret == 0)
+        return AVERROR_EOF;
+    return print_tls_error(h, ret);
+}
+
+static int tls_write(URLContext *h, const uint8_t *buf, int size)
+{
+    TLSContext *c = h->priv_data;
+    int ret = gnutls_record_send(c->session, buf, size);
+    if (ret > 0)
+        return ret;
+    if (ret == 0)
+        return AVERROR_EOF;
+    return print_tls_error(h, ret);
+}
+
+static const AVOption options[] = {
+    TLS_COMMON_OPTIONS(TLSContext, tls_shared),
+    { NULL }
+};
+
+static const AVClass tls_class = {
+    .class_name = "tls",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+URLProtocol ff_tls_gnutls_protocol = {
+    .name           = "tls",
+    .url_open2      = tls_open,
+    .url_read       = tls_read,
+    .url_write      = tls_write,
+    .url_close      = tls_close,
+    .priv_data_size = sizeof(TLSContext),
+    .flags          = URL_PROTOCOL_FLAG_NETWORK,
+    .priv_data_class = &tls_class,
+};