mirror of https://git.ffmpeg.org/ffmpeg.git
317 lines
9.6 KiB
C
317 lines
9.6 KiB
C
/*
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* TLS/SSL Protocol
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* Copyright (c) 2011 Martin Storsjo
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "url.h"
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#include "libavutil/avstring.h"
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#include "libavutil/parseutils.h"
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#if CONFIG_GNUTLS
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#include <gnutls/gnutls.h>
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#define TLS_read(c, buf, size) gnutls_record_recv(c->session, buf, size)
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#define TLS_write(c, buf, size) gnutls_record_send(c->session, buf, size)
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#define TLS_shutdown(c) gnutls_bye(c->session, GNUTLS_SHUT_RDWR)
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#define TLS_free(c) do { \
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if (c->session) \
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gnutls_deinit(c->session); \
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if (c->cred) \
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gnutls_certificate_free_credentials(c->cred); \
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} while (0)
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#elif CONFIG_OPENSSL
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#include <openssl/bio.h>
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#include <openssl/ssl.h>
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#include <openssl/err.h>
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#define TLS_read(c, buf, size) SSL_read(c->ssl, buf, size)
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#define TLS_write(c, buf, size) SSL_write(c->ssl, buf, size)
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#define TLS_shutdown(c) SSL_shutdown(c->ssl)
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#define TLS_free(c) do { \
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if (c->ssl) \
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SSL_free(c->ssl); \
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if (c->ctx) \
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SSL_CTX_free(c->ctx); \
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} while (0)
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#endif
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#include "network.h"
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#include "os_support.h"
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#include "internal.h"
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#if HAVE_POLL_H
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#include <poll.h>
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#endif
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typedef struct {
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const AVClass *class;
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URLContext *tcp;
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#if CONFIG_GNUTLS
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gnutls_session_t session;
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gnutls_certificate_credentials_t cred;
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#elif CONFIG_OPENSSL
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SSL_CTX *ctx;
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SSL *ssl;
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#endif
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int fd;
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} TLSContext;
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static int do_tls_poll(URLContext *h, int ret)
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{
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TLSContext *c = h->priv_data;
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struct pollfd p = { c->fd, 0, 0 };
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#if CONFIG_GNUTLS
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switch (ret) {
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case GNUTLS_E_AGAIN:
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case GNUTLS_E_INTERRUPTED:
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break;
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case GNUTLS_E_WARNING_ALERT_RECEIVED:
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av_log(h, AV_LOG_WARNING, "%s\n", gnutls_strerror(ret));
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break;
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default:
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av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret));
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return AVERROR(EIO);
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}
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if (gnutls_record_get_direction(c->session))
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p.events = POLLOUT;
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else
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p.events = POLLIN;
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#elif CONFIG_OPENSSL
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ret = SSL_get_error(c->ssl, ret);
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if (ret == SSL_ERROR_WANT_READ) {
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p.events = POLLIN;
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} else if (ret == SSL_ERROR_WANT_WRITE) {
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p.events = POLLOUT;
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} else {
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av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
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return AVERROR(EIO);
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}
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#endif
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if (h->flags & AVIO_FLAG_NONBLOCK)
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return AVERROR(EAGAIN);
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while (1) {
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int n = poll(&p, 1, 100);
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if (n > 0)
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break;
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if (ff_check_interrupt(&h->interrupt_callback))
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return AVERROR(EINTR);
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}
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return 0;
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}
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static void set_options(URLContext *h, const char *uri)
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{
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TLSContext *c = h->priv_data;
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char buf[1024], key[1024];
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int has_cert, has_key, verify = 0;
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#if CONFIG_GNUTLS
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int ret;
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#endif
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const char *p = strchr(uri, '?');
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if (!p)
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return;
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if (av_find_info_tag(buf, sizeof(buf), "cafile", p)) {
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#if CONFIG_GNUTLS
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ret = gnutls_certificate_set_x509_trust_file(c->cred, buf, GNUTLS_X509_FMT_PEM);
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if (ret < 0)
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av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret));
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#elif CONFIG_OPENSSL
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if (!SSL_CTX_load_verify_locations(c->ctx, buf, NULL))
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av_log(h, AV_LOG_ERROR, "SSL_CTX_load_verify_locations %s\n", ERR_error_string(ERR_get_error(), NULL));
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#endif
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}
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if (av_find_info_tag(buf, sizeof(buf), "verify", p)) {
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char *endptr = NULL;
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verify = strtol(buf, &endptr, 10);
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if (buf == endptr)
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verify = 1;
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}
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has_cert = av_find_info_tag(buf, sizeof(buf), "cert", p);
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has_key = av_find_info_tag(key, sizeof(key), "key", p);
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#if CONFIG_GNUTLS
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if (has_cert && has_key) {
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ret = gnutls_certificate_set_x509_key_file(c->cred, buf, key, GNUTLS_X509_FMT_PEM);
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if (ret < 0)
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av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret));
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} else if (has_cert ^ has_key) {
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av_log(h, AV_LOG_ERROR, "cert and key required\n");
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}
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gnutls_certificate_set_verify_flags(c->cred, verify);
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#elif CONFIG_OPENSSL
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if (has_cert && !SSL_CTX_use_certificate_chain_file(c->ctx, buf))
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av_log(h, AV_LOG_ERROR, "SSL_CTX_use_certificate_chain_file %s\n", ERR_error_string(ERR_get_error(), NULL));
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if (has_key && !SSL_CTX_use_PrivateKey_file(c->ctx, key, SSL_FILETYPE_PEM))
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av_log(h, AV_LOG_ERROR, "SSL_CTX_use_PrivateKey_file %s\n", ERR_error_string(ERR_get_error(), NULL));
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if (verify)
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SSL_CTX_set_verify(c->ctx, SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT, 0);
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#endif
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}
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static int tls_open(URLContext *h, const char *uri, int flags)
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{
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TLSContext *c = h->priv_data;
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int ret;
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int port;
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char buf[200], host[200], path[1024];
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int numerichost = 0;
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struct addrinfo hints = { 0 }, *ai = NULL;
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const char *proxy_path;
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int use_proxy;
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int server = 0;
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const char *p = strchr(uri, '?');
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if (p && av_find_info_tag(buf, sizeof(buf), "listen", p))
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server = 1;
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ff_tls_init();
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av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, path, sizeof(path), uri);
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ff_url_join(buf, sizeof(buf), "tcp", NULL, host, port, "%s", path);
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hints.ai_flags = AI_NUMERICHOST;
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if (!getaddrinfo(host, NULL, &hints, &ai)) {
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numerichost = 1;
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freeaddrinfo(ai);
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}
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proxy_path = getenv("http_proxy");
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use_proxy = !ff_http_match_no_proxy(getenv("no_proxy"), host) &&
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proxy_path != NULL && av_strstart(proxy_path, "http://", NULL);
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if (use_proxy) {
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char proxy_host[200], proxy_auth[200], dest[200];
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int proxy_port;
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av_url_split(NULL, 0, proxy_auth, sizeof(proxy_auth),
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proxy_host, sizeof(proxy_host), &proxy_port, NULL, 0,
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proxy_path);
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ff_url_join(dest, sizeof(dest), NULL, NULL, host, port, NULL);
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ff_url_join(buf, sizeof(buf), "httpproxy", proxy_auth, proxy_host,
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proxy_port, "/%s", dest);
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}
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ret = ffurl_open(&c->tcp, buf, AVIO_FLAG_READ_WRITE,
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&h->interrupt_callback, NULL);
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if (ret)
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goto fail;
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c->fd = ffurl_get_file_handle(c->tcp);
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#if CONFIG_GNUTLS
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gnutls_init(&c->session, server ? GNUTLS_SERVER : GNUTLS_CLIENT);
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if (!numerichost)
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gnutls_server_name_set(c->session, GNUTLS_NAME_DNS, host, strlen(host));
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gnutls_certificate_allocate_credentials(&c->cred);
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set_options(h, uri);
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gnutls_credentials_set(c->session, GNUTLS_CRD_CERTIFICATE, c->cred);
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gnutls_transport_set_ptr(c->session, (gnutls_transport_ptr_t)
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(intptr_t) c->fd);
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gnutls_priority_set_direct(c->session, "NORMAL", NULL);
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while (1) {
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ret = gnutls_handshake(c->session);
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if (ret == 0)
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break;
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if ((ret = do_tls_poll(h, ret)) < 0)
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goto fail;
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}
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#elif CONFIG_OPENSSL
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c->ctx = SSL_CTX_new(server ? TLSv1_server_method() : TLSv1_client_method());
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if (!c->ctx) {
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av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
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ret = AVERROR(EIO);
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goto fail;
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}
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set_options(h, uri);
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c->ssl = SSL_new(c->ctx);
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if (!c->ssl) {
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av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
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ret = AVERROR(EIO);
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goto fail;
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}
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SSL_set_fd(c->ssl, c->fd);
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if (!server && !numerichost)
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SSL_set_tlsext_host_name(c->ssl, host);
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while (1) {
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ret = server ? SSL_accept(c->ssl) : SSL_connect(c->ssl);
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if (ret > 0)
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break;
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if (ret == 0) {
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av_log(h, AV_LOG_ERROR, "Unable to negotiate TLS/SSL session\n");
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ret = AVERROR(EIO);
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goto fail;
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}
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if ((ret = do_tls_poll(h, ret)) < 0)
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goto fail;
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}
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#endif
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return 0;
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fail:
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TLS_free(c);
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if (c->tcp)
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ffurl_close(c->tcp);
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ff_tls_deinit();
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return ret;
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}
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static int tls_read(URLContext *h, uint8_t *buf, int size)
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{
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TLSContext *c = h->priv_data;
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while (1) {
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int ret = TLS_read(c, buf, size);
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if (ret > 0)
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return ret;
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if (ret == 0)
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return AVERROR_EOF;
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if ((ret = do_tls_poll(h, ret)) < 0)
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return ret;
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}
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return 0;
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}
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static int tls_write(URLContext *h, const uint8_t *buf, int size)
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{
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TLSContext *c = h->priv_data;
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while (1) {
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int ret = TLS_write(c, buf, size);
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if (ret > 0)
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return ret;
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if (ret == 0)
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return AVERROR_EOF;
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if ((ret = do_tls_poll(h, ret)) < 0)
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return ret;
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}
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return 0;
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}
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static int tls_close(URLContext *h)
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{
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TLSContext *c = h->priv_data;
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TLS_shutdown(c);
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TLS_free(c);
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ffurl_close(c->tcp);
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ff_tls_deinit();
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return 0;
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}
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URLProtocol ff_tls_protocol = {
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.name = "tls",
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.url_open = tls_open,
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.url_read = tls_read,
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.url_write = tls_write,
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.url_close = tls_close,
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.priv_data_size = sizeof(TLSContext),
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.flags = URL_PROTOCOL_FLAG_NETWORK,
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};
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