libavformat/tls.c

   1 /*
   2  * TLS/SSL Protocol
   3  * Copyright (c) 2011 Martin Storsjo
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * Libav is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "avformat.h"
  23 #include "url.h"
  24 #include "libavutil/avstring.h"
  25 #if CONFIG_GNUTLS
  26 #include <gnutls/gnutls.h>
  27 #define TLS_read(c, buf, size)  gnutls_record_recv(c->session, buf, size)
  28 #define TLS_write(c, buf, size) gnutls_record_send(c->session, buf, size)
  29 #define TLS_shutdown(c)         gnutls_bye(c->session, GNUTLS_SHUT_RDWR)
  30 #define TLS_free(c) do { \
  31         if (c->session) \
  32             gnutls_deinit(c->session); \
  33         if (c->cred) \
  34             gnutls_certificate_free_credentials(c->cred); \
  35     } while (0)
  36 #elif CONFIG_OPENSSL
  37 #include <openssl/bio.h>
  38 #include <openssl/ssl.h>
  39 #include <openssl/err.h>
  40 #define TLS_read(c, buf, size)  SSL_read(c->ssl,  buf, size)
  41 #define TLS_write(c, buf, size) SSL_write(c->ssl, buf, size)
  42 #define TLS_shutdown(c)         SSL_shutdown(c->ssl)
  43 #define TLS_free(c) do { \
  44         if (c->ssl) \
  45             SSL_free(c->ssl); \
  46         if (c->ctx) \
  47             SSL_CTX_free(c->ctx); \
  48     } while (0)
  49 #endif
  50 #include "network.h"
  51 #include "os_support.h"
  52 #include "internal.h"
  53 #if HAVE_POLL_H
  54 #include <poll.h>
  55 #endif
  56
  57 typedef struct {
  58     const AVClass *class;
  59     URLContext *tcp;
  60 #if CONFIG_GNUTLS
  61     gnutls_session_t session;
  62     gnutls_certificate_credentials_t cred;
  63 #elif CONFIG_OPENSSL
  64     SSL_CTX *ctx;
  65     SSL *ssl;
  66 #endif
  67     int fd;
  68 } TLSContext;
  69
  70 static int do_tls_poll(URLContext *h, int ret)
  71 {
  72     TLSContext *c = h->priv_data;
  73     struct pollfd p = { c->fd, 0, 0 };
  74 #if CONFIG_GNUTLS
  75     if (ret != GNUTLS_E_AGAIN && ret != GNUTLS_E_INTERRUPTED) {
  76         av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret));
  77         return AVERROR(EIO);
  78     }
  79     if (gnutls_record_get_direction(c->session))
  80         p.events = POLLOUT;
  81     else
  82         p.events = POLLIN;
  83 #elif CONFIG_OPENSSL
  84     ret = SSL_get_error(c->ssl, ret);
  85     if (ret == SSL_ERROR_WANT_READ) {
  86         p.events = POLLIN;
  87     } else if (ret == SSL_ERROR_WANT_WRITE) {
  88         p.events = POLLOUT;
  89     } else {
  90         av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
  91         return AVERROR(EIO);
  92     }
  93 #endif
  94     if (h->flags & AVIO_FLAG_NONBLOCK)
  95         return AVERROR(EAGAIN);
  96     while (1) {
  97         int n = poll(&p, 1, 100);
  98         if (n > 0)
  99             break;
 100         if (ff_check_interrupt(&h->interrupt_callback))
 101             return AVERROR(EINTR);
 102     }
 103     return 0;
 104 }
 105
 106 static int tls_open(URLContext *h, const char *uri, int flags)
 107 {
 108     TLSContext *c = h->priv_data;
 109     int ret;
 110     int port;
 111     char buf[200], host[200];
 112     int numerichost = 0;
 113     struct addrinfo hints = { 0 }, *ai = NULL;
 114     const char *proxy_path;
 115     int use_proxy;
 116
 117     ff_tls_init();
 118
 119     av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0, uri);
 120     ff_url_join(buf, sizeof(buf), "tcp", NULL, host, port, NULL);
 121
 122     hints.ai_flags = AI_NUMERICHOST;
 123     if (!getaddrinfo(host, NULL, &hints, &ai)) {
 124         numerichost = 1;
 125         freeaddrinfo(ai);
 126     }
 127
 128     proxy_path = getenv("http_proxy");
 129     use_proxy = !ff_http_match_no_proxy(getenv("no_proxy"), host) &&
 130                 proxy_path != NULL && av_strstart(proxy_path, "http://", NULL);
 131
 132     if (use_proxy) {
 133         char proxy_host[200], proxy_auth[200], dest[200];
 134         int proxy_port;
 135         av_url_split(NULL, 0, proxy_auth, sizeof(proxy_auth),
 136                      proxy_host, sizeof(proxy_host), &proxy_port, NULL, 0,
 137                      proxy_path);
 138         ff_url_join(dest, sizeof(dest), NULL, NULL, host, port, NULL);
 139         ff_url_join(buf, sizeof(buf), "httpproxy", proxy_auth, proxy_host,
 140                     proxy_port, "/%s", dest);
 141     }
 142
 143     ret = ffurl_open(&c->tcp, buf, AVIO_FLAG_READ_WRITE,
 144                      &h->interrupt_callback, NULL);
 145     if (ret)
 146         goto fail;
 147     c->fd = ffurl_get_file_handle(c->tcp);
 148
 149 #if CONFIG_GNUTLS
 150     gnutls_init(&c->session, GNUTLS_CLIENT);
 151     if (!numerichost)
 152         gnutls_server_name_set(c->session, GNUTLS_NAME_DNS, host, strlen(host));
 153     gnutls_certificate_allocate_credentials(&c->cred);
 154     gnutls_certificate_set_verify_flags(c->cred, 0);
 155     gnutls_credentials_set(c->session, GNUTLS_CRD_CERTIFICATE, c->cred);
 156     gnutls_transport_set_ptr(c->session, (gnutls_transport_ptr_t)
 157                                          (intptr_t) c->fd);
 158     gnutls_priority_set_direct(c->session, "NORMAL", NULL);
 159     while (1) {
 160         ret = gnutls_handshake(c->session);
 161         if (ret == 0)
 162             break;
 163         if ((ret = do_tls_poll(h, ret)) < 0)
 164             goto fail;
 165     }
 166 #elif CONFIG_OPENSSL
 167     c->ctx = SSL_CTX_new(TLSv1_client_method());
 168     if (!c->ctx) {
 169         av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
 170         ret = AVERROR(EIO);
 171         goto fail;
 172     }
 173     c->ssl = SSL_new(c->ctx);
 174     if (!c->ssl) {
 175         av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
 176         ret = AVERROR(EIO);
 177         goto fail;
 178     }
 179     SSL_set_fd(c->ssl, c->fd);
 180     if (!numerichost)
 181         SSL_set_tlsext_host_name(c->ssl, host);
 182     while (1) {
 183         ret = SSL_connect(c->ssl);
 184         if (ret > 0)
 185             break;
 186         if (ret == 0) {
 187             av_log(h, AV_LOG_ERROR, "Unable to negotiate TLS/SSL session\n");
 188             ret = AVERROR(EIO);
 189             goto fail;
 190         }
 191         if ((ret = do_tls_poll(h, ret)) < 0)
 192             goto fail;
 193     }
 194 #endif
 195     return 0;
 196 fail:
 197     TLS_free(c);
 198     if (c->tcp)
 199         ffurl_close(c->tcp);
 200     ff_tls_deinit();
 201     return ret;
 202 }
 203
 204 static int tls_read(URLContext *h, uint8_t *buf, int size)
 205 {
 206     TLSContext *c = h->priv_data;
 207     while (1) {
 208         int ret = TLS_read(c, buf, size);
 209         if (ret > 0)
 210             return ret;
 211         if (ret == 0)
 212             return AVERROR_EOF;
 213         if ((ret = do_tls_poll(h, ret)) < 0)
 214             return ret;
 215     }
 216     return 0;
 217 }
 218
 219 static int tls_write(URLContext *h, const uint8_t *buf, int size)
 220 {
 221     TLSContext *c = h->priv_data;
 222     while (1) {
 223         int ret = TLS_write(c, buf, size);
 224         if (ret > 0)
 225             return ret;
 226         if (ret == 0)
 227             return AVERROR_EOF;
 228         if ((ret = do_tls_poll(h, ret)) < 0)
 229             return ret;
 230     }
 231     return 0;
 232 }
 233
 234 static int tls_close(URLContext *h)
 235 {
 236     TLSContext *c = h->priv_data;
 237     TLS_shutdown(c);
 238     TLS_free(c);
 239     ffurl_close(c->tcp);
 240     ff_tls_deinit();
 241     return 0;
 242 }
 243
 244 URLProtocol ff_tls_protocol = {
 245     .name           = "tls",
 246     .url_open       = tls_open,
 247     .url_read       = tls_read,
 248     .url_write      = tls_write,
 249     .url_close      = tls_close,
 250     .priv_data_size = sizeof(TLSContext),
 251     .flags          = URL_PROTOCOL_FLAG_NETWORK,
 252 };