avformat: Add the tls protocol, using OpenSSL or gnutls

Note, this protocol doesn't yet check verify the server
certificate against a local database of trusted CA root
certificates.

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

1 files changed, 234 insertions, 0 deletions

diff --git a/libavformat/tls.c b/libavformat/tls.c
new file mode 100644
index 0000000000..85bf46f903
--- /dev/null
+++ b/libavformat/tls.c
@@ -0,0 +1,234 @@
+/*
+ * 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 "url.h"
+#include "libavutil/avstring.h"
+#if CONFIG_GNUTLS
+#include <gnutls/gnutls.h>
+#define TLS_read(c, buf, size)  gnutls_record_recv(c->session, buf, size)
+#define TLS_write(c, buf, size) gnutls_record_send(c->session, buf, size)
+#define TLS_shutdown(c)         gnutls_bye(c->session, GNUTLS_SHUT_RDWR)
+#define TLS_free(c) do { \
+        if (c->session) \
+            gnutls_deinit(c->session); \
+        if (c->cred) \
+            gnutls_certificate_free_credentials(c->cred); \
+    } while (0)
+#elif CONFIG_OPENSSL
+#include <openssl/bio.h>
+#include <openssl/ssl.h>
+#include <openssl/err.h>
+#define TLS_read(c, buf, size)  SSL_read(c->ssl,  buf, size)
+#define TLS_write(c, buf, size) SSL_write(c->ssl, buf, size)
+#define TLS_shutdown(c)         SSL_shutdown(c->ssl)
+#define TLS_free(c) do { \
+        if (c->ssl) \
+            SSL_free(c->ssl); \
+        if (c->ctx) \
+            SSL_CTX_free(c->ctx); \
+    } while (0)
+#endif
+#include "network.h"
+#include "os_support.h"
+#include "internal.h"
+#if HAVE_POLL_H
+#include <poll.h>
+#endif
+
+typedef struct {
+    const AVClass *class;
+    URLContext *tcp;
+#if CONFIG_GNUTLS
+    gnutls_session_t session;
+    gnutls_certificate_credentials_t cred;
+#elif CONFIG_OPENSSL
+    SSL_CTX *ctx;
+    SSL *ssl;
+#endif
+    int fd;
+} TLSContext;
+
+static int do_tls_poll(URLContext *h, int ret)
+{
+    TLSContext *c = h->priv_data;
+    struct pollfd p = { c->fd, 0, 0 };
+#if CONFIG_GNUTLS
+    if (ret != GNUTLS_E_AGAIN && ret != GNUTLS_E_INTERRUPTED) {
+        av_log(NULL, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret));
+        return AVERROR(EIO);
+    }
+    if (gnutls_record_get_direction(c->session))
+        p.events = POLLOUT;
+    else
+        p.events = POLLIN;
+#elif CONFIG_OPENSSL
+    ret = SSL_get_error(c->ssl, ret);
+    if (ret == SSL_ERROR_WANT_READ) {
+        p.events = POLLIN;
+    } else if (ret == SSL_ERROR_WANT_WRITE) {
+        p.events = POLLOUT;
+    } else {
+        av_log(NULL, AV_LOG_ERROR, "%s\n", ERR_error_string(ret, NULL));
+        return AVERROR(EIO);
+    }
+#endif
+    if (h->flags & URL_FLAG_NONBLOCK)
+        return AVERROR(EAGAIN);
+    while (1) {
+        int n = poll(&p, 1, 100);
+        if (n > 0)
+            break;
+        if (url_interrupt_cb())
+            return AVERROR(EINTR);
+    }
+    return 0;
+}
+
+static int tls_open(URLContext *h, const char *uri, int flags)
+{
+    TLSContext *c = h->priv_data;
+    int ret;
+    int port;
+    char buf[200], host[200];
+    int numerichost = 0;
+    struct addrinfo hints = { 0 }, *ai = NULL;
+
+    ff_tls_init();
+
+    av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0, uri);
+    ff_url_join(buf, sizeof(buf), "tcp", NULL, host, port, NULL);
+
+    hints.ai_flags = AI_NUMERICHOST;
+    if (!getaddrinfo(host, NULL, &hints, &ai)) {
+        numerichost = 1;
+        freeaddrinfo(ai);
+    }
+
+    ret = ffurl_open(&c->tcp, buf, AVIO_FLAG_READ_WRITE);
+    if (ret)
+        goto fail;
+    c->fd = ffurl_get_file_handle(c->tcp);
+
+#if CONFIG_GNUTLS
+    gnutls_init(&c->session, GNUTLS_CLIENT);
+    if (!numerichost)
+        gnutls_server_name_set(c->session, GNUTLS_NAME_DNS, host, strlen(host));
+    gnutls_certificate_allocate_credentials(&c->cred);
+    gnutls_certificate_set_verify_flags(c->cred, 0);
+    gnutls_credentials_set(c->session, GNUTLS_CRD_CERTIFICATE, c->cred);
+    gnutls_transport_set_ptr(c->session, (gnutls_transport_ptr_t)
+                                         (intptr_t) c->fd);
+    gnutls_priority_set_direct(c->session, "NORMAL", NULL);
+    while (1) {
+        ret = gnutls_handshake(c->session);
+        if (ret == 0)
+            break;
+        if ((ret = do_tls_poll(h, ret)) < 0)
+            goto fail;
+    }
+#elif CONFIG_OPENSSL
+    c->ctx = SSL_CTX_new(SSLv3_client_method());
+    if (!c->ctx) {
+        av_log(NULL, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
+        ret = AVERROR(EIO);
+        goto fail;
+    }
+    c->ssl = SSL_new(c->ctx);
+    if (!c->ssl) {
+        av_log(NULL, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
+        ret = AVERROR(EIO);
+        goto fail;
+    }
+    SSL_set_fd(c->ssl, c->fd);
+    if (!numerichost)
+        SSL_set_tlsext_host_name(c->ssl, host);
+    while (1) {
+        ret = SSL_connect(c->ssl);
+        if (ret > 0)
+            break;
+        if (ret == 0) {
+            av_log(NULL, AV_LOG_ERROR, "Unable to negotiate TLS/SSL session\n");
+            ret = AVERROR(EIO);
+            goto fail;
+        }
+        if ((ret = do_tls_poll(h, ret)) < 0)
+            goto fail;
+    }
+#endif
+    return 0;
+fail:
+    TLS_free(c);
+    if (c->tcp)
+        ffurl_close(c->tcp);
+    ff_tls_deinit();
+    return ret;
+}
+
+static int tls_read(URLContext *h, uint8_t *buf, int size)
+{
+    TLSContext *c = h->priv_data;
+    while (1) {
+        int ret = TLS_read(c, buf, size);
+        if (ret > 0)
+            return ret;
+        if (ret == 0)
+            return AVERROR(EIO);
+        if ((ret = do_tls_poll(h, ret)) < 0)
+            return ret;
+    }
+    return 0;
+}
+
+static int tls_write(URLContext *h, const uint8_t *buf, int size)
+{
+    TLSContext *c = h->priv_data;
+    while (1) {
+        int ret = TLS_write(c, buf, size);
+        if (ret > 0)
+            return ret;
+        if (ret == 0)
+            return AVERROR(EIO);
+        if ((ret = do_tls_poll(h, ret)) < 0)
+            return ret;
+    }
+    return 0;
+}
+
+static int tls_close(URLContext *h)
+{
+    TLSContext *c = h->priv_data;
+    TLS_shutdown(c);
+    TLS_free(c);
+    ffurl_close(c->tcp);
+    ff_tls_deinit();
+    return 0;
+}
+
+URLProtocol ff_tls_protocol = {
+    .name           = "tls",
+    .url_open       = tls_open,
+    .url_read       = tls_read,
+    .url_write      = tls_write,
+    .url_seek       = NULL,
+    .url_close      = tls_close,
+    .priv_data_size = sizeof(TLSContext),
+};