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ffmpeg/libavformat/tls.c

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/*
* 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"
#include "libavutil/parseutils.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(h, 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(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
return AVERROR(EIO);
}
#endif
if (h->flags & AVIO_FLAG_NONBLOCK)
return AVERROR(EAGAIN);
while (1) {
int n = poll(&p, 1, 100);
if (n > 0)
break;
if (ff_check_interrupt(&h->interrupt_callback))
return AVERROR(EINTR);
}
return 0;
}
static void set_options(URLContext *h, const char *uri)
{
TLSContext *c = h->priv_data;
char buf[1024], key[1024];
int has_cert, has_key, verify = 0;
#if CONFIG_GNUTLS
int ret;
#endif
const char *p = strchr(uri, '?');
if (!p)
return;
if (av_find_info_tag(buf, sizeof(buf), "cafile", p)) {
#if CONFIG_GNUTLS
ret = gnutls_certificate_set_x509_trust_file(c->cred, buf, GNUTLS_X509_FMT_PEM);
if (ret < 0)
av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret));
#elif CONFIG_OPENSSL
if (!SSL_CTX_load_verify_locations(c->ctx, buf, NULL))
av_log(h, AV_LOG_ERROR, "SSL_CTX_load_verify_locations %s\n", ERR_error_string(ERR_get_error(), NULL));
#endif
}
if (av_find_info_tag(buf, sizeof(buf), "verify", p)) {
char *endptr = NULL;
verify = strtol(buf, &endptr, 10);
if (buf == endptr)
verify = 1;
}
has_cert = av_find_info_tag(buf, sizeof(buf), "cert", p);
has_key = av_find_info_tag(key, sizeof(key), "key", p);
#if CONFIG_GNUTLS
if (has_cert && has_key) {
ret = gnutls_certificate_set_x509_key_file(c->cred, buf, key, GNUTLS_X509_FMT_PEM);
if (ret < 0)
av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret));
} else if (has_cert ^ has_key) {
av_log(h, AV_LOG_ERROR, "cert and key required\n");
}
gnutls_certificate_set_verify_flags(c->cred, verify);
#elif CONFIG_OPENSSL
if (has_cert && !SSL_CTX_use_certificate_chain_file(c->ctx, buf))
av_log(h, AV_LOG_ERROR, "SSL_CTX_use_certificate_chain_file %s\n", ERR_error_string(ERR_get_error(), NULL));
if (has_key && !SSL_CTX_use_PrivateKey_file(c->ctx, key, SSL_FILETYPE_PEM))
av_log(h, AV_LOG_ERROR, "SSL_CTX_use_PrivateKey_file %s\n", ERR_error_string(ERR_get_error(), NULL));
if (verify)
SSL_CTX_set_verify(c->ctx, SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT, 0);
#endif
}
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], path[1024];
int numerichost = 0;
struct addrinfo hints = { 0 }, *ai = NULL;
const char *proxy_path;
int use_proxy;
int server = 0;
const char *p = strchr(uri, '?');
if (p && av_find_info_tag(buf, sizeof(buf), "listen", p))
server = 1;
ff_tls_init();
proxy_path = getenv("http_proxy");
use_proxy = (proxy_path != NULL) && !getenv("no_proxy") &&
av_strstart(proxy_path, "http://", NULL);
av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, path, sizeof(path), uri);
ff_url_join(buf, sizeof(buf), "tcp", NULL, host, port, "%s", path);
hints.ai_flags = AI_NUMERICHOST;
if (!getaddrinfo(host, NULL, &hints, &ai)) {
numerichost = 1;
freeaddrinfo(ai);
}
if (use_proxy) {
char proxy_host[200], proxy_auth[200], dest[200];
int proxy_port;
av_url_split(NULL, 0, proxy_auth, sizeof(proxy_auth),
proxy_host, sizeof(proxy_host), &proxy_port, NULL, 0,
proxy_path);
ff_url_join(dest, sizeof(dest), NULL, NULL, host, port, NULL);
ff_url_join(buf, sizeof(buf), "httpproxy", proxy_auth, proxy_host,
proxy_port, "/%s", dest);
}
ret = ffurl_open(&c->tcp, buf, AVIO_FLAG_READ_WRITE,
&h->interrupt_callback, NULL);
if (ret)
goto fail;
c->fd = ffurl_get_file_handle(c->tcp);
#if CONFIG_GNUTLS
gnutls_init(&c->session, server ? GNUTLS_SERVER : GNUTLS_CLIENT);
if (!numerichost)
gnutls_server_name_set(c->session, GNUTLS_NAME_DNS, host, strlen(host));
gnutls_certificate_allocate_credentials(&c->cred);
set_options(h, uri);
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(server ? TLSv1_server_method() : TLSv1_client_method());
if (!c->ctx) {
av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
ret = AVERROR(EIO);
goto fail;
}
set_options(h, uri);
c->ssl = SSL_new(c->ctx);
if (!c->ssl) {
av_log(h, 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 (!server && !numerichost)
SSL_set_tlsext_host_name(c->ssl, host);
while (1) {
ret = server ? SSL_accept(c->ssl) : SSL_connect(c->ssl);
if (ret > 0)
break;
if (ret == 0) {
av_log(h, 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_EOF;
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_EOF;
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_close = tls_close,
.priv_data_size = sizeof(TLSContext),
.flags = URL_PROTOCOL_FLAG_NETWORK,
};
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