397 lines
13 KiB
C
397 lines
13 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/opt.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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#include <gnutls/x509.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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char *ca_file;
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int verify;
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char *cert_file;
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char *key_file;
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int listen;
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} TLSContext;
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#define OFFSET(x) offsetof(TLSContext, x)
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#define D AV_OPT_FLAG_DECODING_PARAM
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#define E AV_OPT_FLAG_ENCODING_PARAM
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static const AVOption options[] = {
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{"ca_file", "Certificate Authority database file", OFFSET(ca_file), AV_OPT_TYPE_STRING, .flags = D|E },
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{"cafile", "Certificate Authority database file", OFFSET(ca_file), AV_OPT_TYPE_STRING, .flags = D|E },
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{"tls_verify", "Verify the peer certificate", OFFSET(verify), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, .flags = D|E },
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{"cert_file", "Certificate file", OFFSET(cert_file), AV_OPT_TYPE_STRING, .flags = D|E },
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{"key_file", "Private key file", OFFSET(key_file), AV_OPT_TYPE_STRING, .flags = D|E },
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{"listen", "Listen for incoming connections", OFFSET(listen), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, .flags = D|E },
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{ NULL }
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};
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static const AVClass tls_class = {
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.class_name = "tls",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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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];
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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 (!c->ca_file && av_find_info_tag(buf, sizeof(buf), "cafile", p))
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c->ca_file = av_strdup(buf);
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if (!c->verify && av_find_info_tag(buf, sizeof(buf), "verify", p)) {
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char *endptr = NULL;
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c->verify = strtol(buf, &endptr, 10);
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if (buf == endptr)
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c->verify = 1;
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}
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if (!c->cert_file && av_find_info_tag(buf, sizeof(buf), "cert", p))
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c->cert_file = av_strdup(buf);
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if (!c->key_file && av_find_info_tag(buf, sizeof(buf), "key", p))
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c->key_file = av_strdup(buf);
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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], opts[50] = "";
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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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const char *p = strchr(uri, '?');
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ff_tls_init();
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if(p && av_find_info_tag(buf, sizeof(buf), "listen", p))
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c->listen = 1;
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if (c->listen)
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snprintf(opts, sizeof(opts), "?listen=1");
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av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0, uri);
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ff_url_join(buf, sizeof(buf), "tcp", NULL, host, port, "%s", opts);
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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, c->listen ? GNUTLS_SERVER : GNUTLS_CLIENT);
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if (!c->listen && !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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if (c->ca_file) {
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ret = gnutls_certificate_set_x509_trust_file(c->cred, c->ca_file, 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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}
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#if GNUTLS_VERSION_MAJOR >= 3
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else
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gnutls_certificate_set_x509_system_trust(c->cred);
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#endif
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gnutls_certificate_set_verify_flags(c->cred, c->verify ?
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GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT : 0);
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if (c->cert_file && c->key_file) {
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ret = gnutls_certificate_set_x509_key_file(c->cred,
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c->cert_file, c->key_file,
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GNUTLS_X509_FMT_PEM);
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if (ret < 0) {
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av_log(h, AV_LOG_ERROR,
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"Unable to set cert/key files %s and %s: %s\n",
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c->cert_file, c->key_file, gnutls_strerror(ret));
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ret = AVERROR(EIO);
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goto fail;
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}
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} else if (c->cert_file || c->key_file)
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av_log(h, AV_LOG_ERROR, "cert and key required\n");
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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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if (c->verify) {
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unsigned int status, cert_list_size;
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gnutls_x509_crt_t cert;
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const gnutls_datum_t *cert_list;
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if ((ret = gnutls_certificate_verify_peers2(c->session, &status)) < 0) {
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av_log(h, AV_LOG_ERROR, "Unable to verify peer certificate: %s\n",
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gnutls_strerror(ret));
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ret = AVERROR(EIO);
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goto fail;
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}
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if (status & GNUTLS_CERT_INVALID) {
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av_log(h, AV_LOG_ERROR, "Peer certificate failed verification\n");
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ret = AVERROR(EIO);
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goto fail;
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}
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if (gnutls_certificate_type_get(c->session) != GNUTLS_CRT_X509) {
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av_log(h, AV_LOG_ERROR, "Unsupported certificate type\n");
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ret = AVERROR(EIO);
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goto fail;
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}
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gnutls_x509_crt_init(&cert);
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cert_list = gnutls_certificate_get_peers(c->session, &cert_list_size);
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gnutls_x509_crt_import(cert, cert_list, GNUTLS_X509_FMT_DER);
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ret = gnutls_x509_crt_check_hostname(cert, host);
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gnutls_x509_crt_deinit(cert);
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if (!ret) {
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av_log(h, AV_LOG_ERROR,
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"The certificate's owner does not match hostname %s\n", host);
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ret = AVERROR(EIO);
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goto fail;
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}
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}
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#elif CONFIG_OPENSSL
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c->ctx = SSL_CTX_new(c->listen ? 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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if (c->ca_file) {
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if (!SSL_CTX_load_verify_locations(c->ctx, c->ca_file, 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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}
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if (c->cert_file && !SSL_CTX_use_certificate_chain_file(c->ctx, c->cert_file)) {
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av_log(h, AV_LOG_ERROR, "Unable to load cert file %s: %s\n",
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c->cert_file, 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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if (c->key_file && !SSL_CTX_use_PrivateKey_file(c->ctx, c->key_file, SSL_FILETYPE_PEM)) {
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av_log(h, AV_LOG_ERROR, "Unable to load key file %s: %s\n",
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c->key_file, 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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// Note, this doesn't check that the peer certificate actually matches
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// the requested hostname.
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if (c->verify)
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SSL_CTX_set_verify(c->ctx, SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT, NULL);
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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 (!c->listen && !numerichost)
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SSL_set_tlsext_host_name(c->ssl, host);
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while (1) {
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ret = c->listen ? 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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.priv_data_class = &tls_class,
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};
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