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, 233 insertions, 0 deletions

diff --git a/libavformat/tls_openssl.c b/libavformat/tls_openssl.c
new file mode 100644
index 0000000000..0fc4122394
--- /dev/null
+++ b/libavformat/tls_openssl.c
@@ -0,0 +1,233 @@
+/*
+ * 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 "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"
+
+#include <openssl/bio.h>
+#include <openssl/ssl.h>
+#include <openssl/err.h>
+
+typedef struct TLSContext {
+    const AVClass *class;
+    TLSShared tls_shared;
+    SSL_CTX *ctx;
+    SSL *ssl;
+} TLSContext;
+
+static int print_tls_error(URLContext *h, int ret)
+{
+    av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
+    return AVERROR(EIO);
+}
+
+static int tls_close(URLContext *h)
+{
+    TLSContext *c = h->priv_data;
+    if (c->ssl) {
+        SSL_shutdown(c->ssl);
+        SSL_free(c->ssl);
+    }
+    if (c->ctx)
+        SSL_CTX_free(c->ctx);
+    if (c->tls_shared.tcp)
+        ffurl_close(c->tls_shared.tcp);
+    ff_tls_deinit();
+    return 0;
+}
+
+static int url_bio_create(BIO *b)
+{
+    b->init = 1;
+    b->ptr = NULL;
+    b->flags = 0;
+    return 1;
+}
+
+static int url_bio_destroy(BIO *b)
+{
+    return 1;
+}
+
+static int url_bio_bread(BIO *b, char *buf, int len)
+{
+    URLContext *h = b->ptr;
+    int ret = ffurl_read(h, buf, len);
+    if (ret >= 0)
+        return ret;
+    BIO_clear_retry_flags(b);
+    if (ret == AVERROR_EXIT)
+        return 0;
+    return -1;
+}
+
+static int url_bio_bwrite(BIO *b, const char *buf, int len)
+{
+    URLContext *h = b->ptr;
+    int ret = ffurl_write(h, buf, len);
+    if (ret >= 0)
+        return ret;
+    BIO_clear_retry_flags(b);
+    if (ret == AVERROR_EXIT)
+        return 0;
+    return -1;
+}
+
+static long url_bio_ctrl(BIO *b, int cmd, long num, void *ptr)
+{
+    if (cmd == BIO_CTRL_FLUSH) {
+        BIO_clear_retry_flags(b);
+        return 1;
+    }
+    return 0;
+}
+
+static int url_bio_bputs(BIO *b, const char *str)
+{
+    return url_bio_bwrite(b, str, strlen(str));
+}
+
+static BIO_METHOD url_bio_method = {
+    .type = BIO_TYPE_SOURCE_SINK,
+    .name = "urlprotocol bio",
+    .bwrite = url_bio_bwrite,
+    .bread = url_bio_bread,
+    .bputs = url_bio_bputs,
+    .bgets = NULL,
+    .ctrl = url_bio_ctrl,
+    .create = url_bio_create,
+    .destroy = url_bio_destroy,
+};
+
+static int tls_open(URLContext *h, const char *uri, int flags, AVDictionary **options)
+{
+    TLSContext *p = h->priv_data;
+    TLSShared *c = &p->tls_shared;
+    BIO *bio;
+    int ret;
+
+    ff_tls_init();
+
+    if ((ret = ff_tls_open_underlying(c, h, uri, options)) < 0)
+        goto fail;
+
+    p->ctx = SSL_CTX_new(c->listen ? TLSv1_server_method() : TLSv1_client_method());
+    if (!p->ctx) {
+        av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
+        ret = AVERROR(EIO);
+        goto fail;
+    }
+    if (c->ca_file)
+        SSL_CTX_load_verify_locations(p->ctx, c->ca_file, NULL);
+    if (c->cert_file && !SSL_CTX_use_certificate_chain_file(p->ctx, c->cert_file)) {
+        av_log(h, AV_LOG_ERROR, "Unable to load cert file %s: %s\n",
+               c->cert_file, ERR_error_string(ERR_get_error(), NULL));
+        ret = AVERROR(EIO);
+        goto fail;
+    }
+    if (c->key_file && !SSL_CTX_use_PrivateKey_file(p->ctx, c->key_file, SSL_FILETYPE_PEM)) {
+        av_log(h, AV_LOG_ERROR, "Unable to load key file %s: %s\n",
+               c->key_file, ERR_error_string(ERR_get_error(), NULL));
+        ret = AVERROR(EIO);
+        goto fail;
+    }
+    // Note, this doesn't check that the peer certificate actually matches
+    // the requested hostname.
+    if (c->verify)
+        SSL_CTX_set_verify(p->ctx, SSL_VERIFY_PEER, NULL);
+    p->ssl = SSL_new(p->ctx);
+    if (!p->ssl) {
+        av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
+        ret = AVERROR(EIO);
+        goto fail;
+    }
+    bio = BIO_new(&url_bio_method);
+    bio->ptr = c->tcp;
+    SSL_set_bio(p->ssl, bio, bio);
+    if (!c->listen && !c->numerichost)
+        SSL_set_tlsext_host_name(p->ssl, c->host);
+    ret = c->listen ? SSL_accept(p->ssl) : SSL_connect(p->ssl);
+    if (ret == 0) {
+        av_log(h, AV_LOG_ERROR, "Unable to negotiate TLS/SSL session\n");
+        ret = AVERROR(EIO);
+        goto fail;
+    } else if (ret < 0) {
+        ret = print_tls_error(h, ret);
+        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 = SSL_read(c->ssl, 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 = SSL_write(c->ssl, 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_openssl_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,
+};