yading@11: /*
yading@11:  * TLS/SSL Protocol
yading@11:  * Copyright (c) 2011 Martin Storsjo
yading@11:  *
yading@11:  * This file is part of Libav.
yading@11:  *
yading@11:  * Libav is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * Libav is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with Libav; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "avformat.h"
yading@11: #include "url.h"
yading@11: #include "libavutil/avstring.h"
yading@11: #include "libavutil/parseutils.h"
yading@11: #if CONFIG_GNUTLS
yading@11: #include <gnutls/gnutls.h>
yading@11: #define TLS_read(c, buf, size)  gnutls_record_recv(c->session, buf, size)
yading@11: #define TLS_write(c, buf, size) gnutls_record_send(c->session, buf, size)
yading@11: #define TLS_shutdown(c)         gnutls_bye(c->session, GNUTLS_SHUT_RDWR)
yading@11: #define TLS_free(c) do { \
yading@11:         if (c->session) \
yading@11:             gnutls_deinit(c->session); \
yading@11:         if (c->cred) \
yading@11:             gnutls_certificate_free_credentials(c->cred); \
yading@11:     } while (0)
yading@11: #elif CONFIG_OPENSSL
yading@11: #include <openssl/bio.h>
yading@11: #include <openssl/ssl.h>
yading@11: #include <openssl/err.h>
yading@11: #define TLS_read(c, buf, size)  SSL_read(c->ssl,  buf, size)
yading@11: #define TLS_write(c, buf, size) SSL_write(c->ssl, buf, size)
yading@11: #define TLS_shutdown(c)         SSL_shutdown(c->ssl)
yading@11: #define TLS_free(c) do { \
yading@11:         if (c->ssl) \
yading@11:             SSL_free(c->ssl); \
yading@11:         if (c->ctx) \
yading@11:             SSL_CTX_free(c->ctx); \
yading@11:     } while (0)
yading@11: #endif
yading@11: #include "network.h"
yading@11: #include "os_support.h"
yading@11: #include "internal.h"
yading@11: #if HAVE_POLL_H
yading@11: #include <poll.h>
yading@11: #endif
yading@11: 
yading@11: typedef struct {
yading@11:     const AVClass *class;
yading@11:     URLContext *tcp;
yading@11: #if CONFIG_GNUTLS
yading@11:     gnutls_session_t session;
yading@11:     gnutls_certificate_credentials_t cred;
yading@11: #elif CONFIG_OPENSSL
yading@11:     SSL_CTX *ctx;
yading@11:     SSL *ssl;
yading@11: #endif
yading@11:     int fd;
yading@11: } TLSContext;
yading@11: 
yading@11: static int do_tls_poll(URLContext *h, int ret)
yading@11: {
yading@11:     TLSContext *c = h->priv_data;
yading@11:     struct pollfd p = { c->fd, 0, 0 };
yading@11: #if CONFIG_GNUTLS
yading@11:     if (ret != GNUTLS_E_AGAIN && ret != GNUTLS_E_INTERRUPTED) {
yading@11:         av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret));
yading@11:         return AVERROR(EIO);
yading@11:     }
yading@11:     if (gnutls_record_get_direction(c->session))
yading@11:         p.events = POLLOUT;
yading@11:     else
yading@11:         p.events = POLLIN;
yading@11: #elif CONFIG_OPENSSL
yading@11:     ret = SSL_get_error(c->ssl, ret);
yading@11:     if (ret == SSL_ERROR_WANT_READ) {
yading@11:         p.events = POLLIN;
yading@11:     } else if (ret == SSL_ERROR_WANT_WRITE) {
yading@11:         p.events = POLLOUT;
yading@11:     } else {
yading@11:         av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
yading@11:         return AVERROR(EIO);
yading@11:     }
yading@11: #endif
yading@11:     if (h->flags & AVIO_FLAG_NONBLOCK)
yading@11:         return AVERROR(EAGAIN);
yading@11:     while (1) {
yading@11:         int n = poll(&p, 1, 100);
yading@11:         if (n > 0)
yading@11:             break;
yading@11:         if (ff_check_interrupt(&h->interrupt_callback))
yading@11:             return AVERROR(EINTR);
yading@11:     }
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static void set_options(URLContext *h, const char *uri)
yading@11: {
yading@11:     TLSContext *c = h->priv_data;
yading@11:     char buf[1024], key[1024];
yading@11:     int has_cert, has_key, verify = 0;
yading@11: #if CONFIG_GNUTLS
yading@11:     int ret;
yading@11: #endif
yading@11:     const char *p = strchr(uri, '?');
yading@11:     if (!p)
yading@11:         return;
yading@11: 
yading@11:     if (av_find_info_tag(buf, sizeof(buf), "cafile", p)) {
yading@11: #if CONFIG_GNUTLS
yading@11:         ret = gnutls_certificate_set_x509_trust_file(c->cred, buf, GNUTLS_X509_FMT_PEM);
yading@11:         if (ret < 0)
yading@11:             av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret));
yading@11: #elif CONFIG_OPENSSL
yading@11:         if (!SSL_CTX_load_verify_locations(c->ctx, buf, NULL))
yading@11:             av_log(h, AV_LOG_ERROR, "SSL_CTX_load_verify_locations %s\n", ERR_error_string(ERR_get_error(), NULL));
yading@11: #endif
yading@11:     }
yading@11: 
yading@11:     if (av_find_info_tag(buf, sizeof(buf), "verify", p)) {
yading@11:         char *endptr = NULL;
yading@11:         verify = strtol(buf, &endptr, 10);
yading@11:         if (buf == endptr)
yading@11:             verify = 1;
yading@11:     }
yading@11: 
yading@11:     has_cert = av_find_info_tag(buf, sizeof(buf), "cert", p);
yading@11:     has_key  = av_find_info_tag(key, sizeof(key), "key", p);
yading@11: #if CONFIG_GNUTLS
yading@11:     if (has_cert && has_key) {
yading@11:         ret = gnutls_certificate_set_x509_key_file(c->cred, buf, key, GNUTLS_X509_FMT_PEM);
yading@11:         if (ret < 0)
yading@11:             av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret));
yading@11:     } else if (has_cert ^ has_key) {
yading@11:         av_log(h, AV_LOG_ERROR, "cert and key required\n");
yading@11:     }
yading@11:     gnutls_certificate_set_verify_flags(c->cred, verify);
yading@11: #elif CONFIG_OPENSSL
yading@11:     if (has_cert && !SSL_CTX_use_certificate_chain_file(c->ctx, buf))
yading@11:         av_log(h, AV_LOG_ERROR, "SSL_CTX_use_certificate_chain_file %s\n", ERR_error_string(ERR_get_error(), NULL));
yading@11:     if (has_key && !SSL_CTX_use_PrivateKey_file(c->ctx, key, SSL_FILETYPE_PEM))
yading@11:         av_log(h, AV_LOG_ERROR, "SSL_CTX_use_PrivateKey_file %s\n", ERR_error_string(ERR_get_error(), NULL));
yading@11:     if (verify)
yading@11:         SSL_CTX_set_verify(c->ctx, SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT, 0);
yading@11: #endif
yading@11: }
yading@11: 
yading@11: static int tls_open(URLContext *h, const char *uri, int flags)
yading@11: {
yading@11:     TLSContext *c = h->priv_data;
yading@11:     int ret;
yading@11:     int port;
yading@11:     char buf[200], host[200], path[1024];
yading@11:     int numerichost = 0;
yading@11:     struct addrinfo hints = { 0 }, *ai = NULL;
yading@11:     const char *proxy_path;
yading@11:     int use_proxy;
yading@11:     int server = 0;
yading@11:     const char *p = strchr(uri, '?');
yading@11:     if (p && av_find_info_tag(buf, sizeof(buf), "listen", p))
yading@11:         server = 1;
yading@11: 
yading@11:     ff_tls_init();
yading@11: 
yading@11:     av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, path, sizeof(path), uri);
yading@11:     ff_url_join(buf, sizeof(buf), "tcp", NULL, host, port, "%s", path);
yading@11: 
yading@11:     hints.ai_flags = AI_NUMERICHOST;
yading@11:     if (!getaddrinfo(host, NULL, &hints, &ai)) {
yading@11:         numerichost = 1;
yading@11:         freeaddrinfo(ai);
yading@11:     }
yading@11: 
yading@11:     proxy_path = getenv("http_proxy");
yading@11:     use_proxy = !ff_http_match_no_proxy(getenv("no_proxy"), host) &&
yading@11:                 proxy_path != NULL && av_strstart(proxy_path, "http://", NULL);
yading@11: 
yading@11:     if (use_proxy) {
yading@11:         char proxy_host[200], proxy_auth[200], dest[200];
yading@11:         int proxy_port;
yading@11:         av_url_split(NULL, 0, proxy_auth, sizeof(proxy_auth),
yading@11:                      proxy_host, sizeof(proxy_host), &proxy_port, NULL, 0,
yading@11:                      proxy_path);
yading@11:         ff_url_join(dest, sizeof(dest), NULL, NULL, host, port, NULL);
yading@11:         ff_url_join(buf, sizeof(buf), "httpproxy", proxy_auth, proxy_host,
yading@11:                     proxy_port, "/%s", dest);
yading@11:     }
yading@11: 
yading@11:     ret = ffurl_open(&c->tcp, buf, AVIO_FLAG_READ_WRITE,
yading@11:                      &h->interrupt_callback, NULL);
yading@11:     if (ret)
yading@11:         goto fail;
yading@11:     c->fd = ffurl_get_file_handle(c->tcp);
yading@11: 
yading@11: #if CONFIG_GNUTLS
yading@11:     gnutls_init(&c->session, server ? GNUTLS_SERVER : GNUTLS_CLIENT);
yading@11:     if (!numerichost)
yading@11:         gnutls_server_name_set(c->session, GNUTLS_NAME_DNS, host, strlen(host));
yading@11:     gnutls_certificate_allocate_credentials(&c->cred);
yading@11:     set_options(h, uri);
yading@11:     gnutls_credentials_set(c->session, GNUTLS_CRD_CERTIFICATE, c->cred);
yading@11:     gnutls_transport_set_ptr(c->session, (gnutls_transport_ptr_t)
yading@11:                                          (intptr_t) c->fd);
yading@11:     gnutls_priority_set_direct(c->session, "NORMAL", NULL);
yading@11:     while (1) {
yading@11:         ret = gnutls_handshake(c->session);
yading@11:         if (ret == 0)
yading@11:             break;
yading@11:         if ((ret = do_tls_poll(h, ret)) < 0)
yading@11:             goto fail;
yading@11:     }
yading@11: #elif CONFIG_OPENSSL
yading@11:     c->ctx = SSL_CTX_new(server ? TLSv1_server_method() : TLSv1_client_method());
yading@11:     if (!c->ctx) {
yading@11:         av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
yading@11:         ret = AVERROR(EIO);
yading@11:         goto fail;
yading@11:     }
yading@11:     set_options(h, uri);
yading@11:     c->ssl = SSL_new(c->ctx);
yading@11:     if (!c->ssl) {
yading@11:         av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
yading@11:         ret = AVERROR(EIO);
yading@11:         goto fail;
yading@11:     }
yading@11:     SSL_set_fd(c->ssl, c->fd);
yading@11:     if (!server && !numerichost)
yading@11:         SSL_set_tlsext_host_name(c->ssl, host);
yading@11:     while (1) {
yading@11:         ret = server ? SSL_accept(c->ssl) : SSL_connect(c->ssl);
yading@11:         if (ret > 0)
yading@11:             break;
yading@11:         if (ret == 0) {
yading@11:             av_log(h, AV_LOG_ERROR, "Unable to negotiate TLS/SSL session\n");
yading@11:             ret = AVERROR(EIO);
yading@11:             goto fail;
yading@11:         }
yading@11:         if ((ret = do_tls_poll(h, ret)) < 0)
yading@11:             goto fail;
yading@11:     }
yading@11: #endif
yading@11:     return 0;
yading@11: fail:
yading@11:     TLS_free(c);
yading@11:     if (c->tcp)
yading@11:         ffurl_close(c->tcp);
yading@11:     ff_tls_deinit();
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: static int tls_read(URLContext *h, uint8_t *buf, int size)
yading@11: {
yading@11:     TLSContext *c = h->priv_data;
yading@11:     while (1) {
yading@11:         int ret = TLS_read(c, buf, size);
yading@11:         if (ret > 0)
yading@11:             return ret;
yading@11:         if (ret == 0)
yading@11:             return AVERROR_EOF;
yading@11:         if ((ret = do_tls_poll(h, ret)) < 0)
yading@11:             return ret;
yading@11:     }
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int tls_write(URLContext *h, const uint8_t *buf, int size)
yading@11: {
yading@11:     TLSContext *c = h->priv_data;
yading@11:     while (1) {
yading@11:         int ret = TLS_write(c, buf, size);
yading@11:         if (ret > 0)
yading@11:             return ret;
yading@11:         if (ret == 0)
yading@11:             return AVERROR_EOF;
yading@11:         if ((ret = do_tls_poll(h, ret)) < 0)
yading@11:             return ret;
yading@11:     }
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int tls_close(URLContext *h)
yading@11: {
yading@11:     TLSContext *c = h->priv_data;
yading@11:     TLS_shutdown(c);
yading@11:     TLS_free(c);
yading@11:     ffurl_close(c->tcp);
yading@11:     ff_tls_deinit();
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: URLProtocol ff_tls_protocol = {
yading@11:     .name           = "tls",
yading@11:     .url_open       = tls_open,
yading@11:     .url_read       = tls_read,
yading@11:     .url_write      = tls_write,
yading@11:     .url_close      = tls_close,
yading@11:     .priv_data_size = sizeof(TLSContext),
yading@11:     .flags          = URL_PROTOCOL_FLAG_NETWORK,
yading@11: };