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  1. /*
  2.  * TLS/SSL Protocol
  3.  * Copyright (c) 2011 Martin Storsjo
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg 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.  * FFmpeg 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 FFmpeg; 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. #include "libavutil/opt.h"
  26. #include "libavutil/parseutils.h"
  27. #if CONFIG_GNUTLS
  28. #include <gnutls/gnutls.h>
  29. #include <gnutls/x509.h>
  30. #define TLS_read(c, buf, size)  gnutls_record_recv(c->session, buf, size)
  31. #define TLS_write(c, buf, size) gnutls_record_send(c->session, buf, size)
  32. #define TLS_shutdown(c)         gnutls_bye(c->session, GNUTLS_SHUT_RDWR)
  33. #define TLS_free(c) do { \
  34.         if (c->session) \
  35.             gnutls_deinit(c->session); \
  36.         if (c->cred) \
  37.             gnutls_certificate_free_credentials(c->cred); \
  38.     } while (0)
  39. #elif CONFIG_OPENSSL
  40. #include <openssl/bio.h>
  41. #include <openssl/ssl.h>
  42. #include <openssl/err.h>
  43. #define TLS_read(c, buf, size)  SSL_read(c->ssl,  buf, size)
  44. #define TLS_write(c, buf, size) SSL_write(c->ssl, buf, size)
  45. #define TLS_shutdown(c)         SSL_shutdown(c->ssl)
  46. #define TLS_free(c) do { \
  47.         if (c->ssl) \
  48.             SSL_free(c->ssl); \
  49.         if (c->ctx) \
  50.             SSL_CTX_free(c->ctx); \
  51.     } while (0)
  52. #endif
  53. #include "network.h"
  54. #include "os_support.h"
  55. #include "internal.h"
  56. #if HAVE_POLL_H
  57. #include <poll.h>
  58. #endif
  59.  
  60. typedef struct {
  61.     const AVClass *class;
  62.     URLContext *tcp;
  63. #if CONFIG_GNUTLS
  64.     gnutls_session_t session;
  65.     gnutls_certificate_credentials_t cred;
  66. #elif CONFIG_OPENSSL
  67.     SSL_CTX *ctx;
  68.     SSL *ssl;
  69. #endif
  70.     int fd;
  71.     char *ca_file;
  72.     int verify;
  73.     char *cert_file;
  74.     char *key_file;
  75.     int listen;
  76. } TLSContext;
  77.  
  78. #define OFFSET(x) offsetof(TLSContext, x)
  79. #define D AV_OPT_FLAG_DECODING_PARAM
  80. #define E AV_OPT_FLAG_ENCODING_PARAM
  81. static const AVOption options[] = {
  82.     {"ca_file",    "Certificate Authority database file", OFFSET(ca_file),   AV_OPT_TYPE_STRING, .flags = D|E },
  83.     {"cafile",     "Certificate Authority database file", OFFSET(ca_file),   AV_OPT_TYPE_STRING, .flags = D|E },
  84.     {"tls_verify", "Verify the peer certificate",         OFFSET(verify),    AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, .flags = D|E },
  85.     {"cert_file",  "Certificate file",                    OFFSET(cert_file), AV_OPT_TYPE_STRING, .flags = D|E },
  86.     {"key_file",   "Private key file",                    OFFSET(key_file),  AV_OPT_TYPE_STRING, .flags = D|E },
  87.     {"listen",     "Listen for incoming connections",     OFFSET(listen),    AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, .flags = D|E },
  88.     { NULL }
  89. };
  90.  
  91. static const AVClass tls_class = {
  92.     .class_name = "tls",
  93.     .item_name  = av_default_item_name,
  94.     .option     = options,
  95.     .version    = LIBAVUTIL_VERSION_INT,
  96. };
  97.  
  98. static int do_tls_poll(URLContext *h, int ret)
  99. {
  100.     TLSContext *c = h->priv_data;
  101.     struct pollfd p = { c->fd, 0, 0 };
  102. #if CONFIG_GNUTLS
  103.     switch (ret) {
  104.     case GNUTLS_E_AGAIN:
  105.     case GNUTLS_E_INTERRUPTED:
  106.         break;
  107.     case GNUTLS_E_WARNING_ALERT_RECEIVED:
  108.         av_log(h, AV_LOG_WARNING, "%s\n", gnutls_strerror(ret));
  109.         break;
  110.     default:
  111.         av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret));
  112.         return AVERROR(EIO);
  113.     }
  114.     if (gnutls_record_get_direction(c->session))
  115.         p.events = POLLOUT;
  116.     else
  117.         p.events = POLLIN;
  118. #elif CONFIG_OPENSSL
  119.     ret = SSL_get_error(c->ssl, ret);
  120.     if (ret == SSL_ERROR_WANT_READ) {
  121.         p.events = POLLIN;
  122.     } else if (ret == SSL_ERROR_WANT_WRITE) {
  123.         p.events = POLLOUT;
  124.     } else {
  125.         av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
  126.         return AVERROR(EIO);
  127.     }
  128. #endif
  129.     if (h->flags & AVIO_FLAG_NONBLOCK)
  130.         return AVERROR(EAGAIN);
  131.     while (1) {
  132.         int n = poll(&p, 1, 100);
  133.         if (n > 0)
  134.             break;
  135.         if (ff_check_interrupt(&h->interrupt_callback))
  136.             return AVERROR(EINTR);
  137.     }
  138.     return 0;
  139. }
  140.  
  141. static void set_options(URLContext *h, const char *uri)
  142. {
  143.     TLSContext *c = h->priv_data;
  144.     char buf[1024];
  145.     const char *p = strchr(uri, '?');
  146.     if (!p)
  147.         return;
  148.  
  149.     if (!c->ca_file && av_find_info_tag(buf, sizeof(buf), "cafile", p))
  150.         c->ca_file = av_strdup(buf);
  151.  
  152.     if (!c->verify && av_find_info_tag(buf, sizeof(buf), "verify", p)) {
  153.         char *endptr = NULL;
  154.         c->verify = strtol(buf, &endptr, 10);
  155.         if (buf == endptr)
  156.             c->verify = 1;
  157.     }
  158.  
  159.     if (!c->cert_file && av_find_info_tag(buf, sizeof(buf), "cert", p))
  160.         c->cert_file = av_strdup(buf);
  161.  
  162.     if (!c->key_file && av_find_info_tag(buf, sizeof(buf), "key", p))
  163.         c->key_file = av_strdup(buf);
  164. }
  165.  
  166. static int tls_open(URLContext *h, const char *uri, int flags)
  167. {
  168.     TLSContext *c = h->priv_data;
  169.     int ret;
  170.     int port;
  171.     char buf[200], host[200], opts[50] = "";
  172.     int numerichost = 0;
  173.     struct addrinfo hints = { 0 }, *ai = NULL;
  174.     const char *proxy_path;
  175.     int use_proxy;
  176.     const char *p = strchr(uri, '?');
  177.  
  178.     ff_tls_init();
  179.  
  180.     if(p && av_find_info_tag(buf, sizeof(buf), "listen", p))
  181.         c->listen = 1;
  182.     if (c->listen)
  183.         snprintf(opts, sizeof(opts), "?listen=1");
  184.  
  185.     av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0, uri);
  186.     ff_url_join(buf, sizeof(buf), "tcp", NULL, host, port, "%s", opts);
  187.  
  188.     hints.ai_flags = AI_NUMERICHOST;
  189.     if (!getaddrinfo(host, NULL, &hints, &ai)) {
  190.         numerichost = 1;
  191.         freeaddrinfo(ai);
  192.     }
  193.  
  194.     proxy_path = getenv("http_proxy");
  195.     use_proxy = !ff_http_match_no_proxy(getenv("no_proxy"), host) &&
  196.                 proxy_path != NULL && av_strstart(proxy_path, "http://", NULL);
  197.  
  198.     if (use_proxy) {
  199.         char proxy_host[200], proxy_auth[200], dest[200];
  200.         int proxy_port;
  201.         av_url_split(NULL, 0, proxy_auth, sizeof(proxy_auth),
  202.                      proxy_host, sizeof(proxy_host), &proxy_port, NULL, 0,
  203.                      proxy_path);
  204.         ff_url_join(dest, sizeof(dest), NULL, NULL, host, port, NULL);
  205.         ff_url_join(buf, sizeof(buf), "httpproxy", proxy_auth, proxy_host,
  206.                     proxy_port, "/%s", dest);
  207.     }
  208.  
  209.     ret = ffurl_open(&c->tcp, buf, AVIO_FLAG_READ_WRITE,
  210.                      &h->interrupt_callback, NULL);
  211.     if (ret)
  212.         goto fail;
  213.     c->fd = ffurl_get_file_handle(c->tcp);
  214.  
  215. #if CONFIG_GNUTLS
  216.     gnutls_init(&c->session, c->listen ? GNUTLS_SERVER : GNUTLS_CLIENT);
  217.     if (!c->listen && !numerichost)
  218.         gnutls_server_name_set(c->session, GNUTLS_NAME_DNS, host, strlen(host));
  219.     gnutls_certificate_allocate_credentials(&c->cred);
  220.     set_options(h, uri);
  221.     if (c->ca_file) {
  222.         ret = gnutls_certificate_set_x509_trust_file(c->cred, c->ca_file, GNUTLS_X509_FMT_PEM);
  223.         if (ret < 0)
  224.             av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret));
  225.     }
  226. #if GNUTLS_VERSION_MAJOR >= 3
  227.     else
  228.         gnutls_certificate_set_x509_system_trust(c->cred);
  229. #endif
  230.     gnutls_certificate_set_verify_flags(c->cred, c->verify ?
  231.                                         GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT : 0);
  232.     if (c->cert_file && c->key_file) {
  233.         ret = gnutls_certificate_set_x509_key_file(c->cred,
  234.                                                    c->cert_file, c->key_file,
  235.                                                    GNUTLS_X509_FMT_PEM);
  236.         if (ret < 0) {
  237.             av_log(h, AV_LOG_ERROR,
  238.                    "Unable to set cert/key files %s and %s: %s\n",
  239.                    c->cert_file, c->key_file, gnutls_strerror(ret));
  240.             ret = AVERROR(EIO);
  241.             goto fail;
  242.         }
  243.     } else if (c->cert_file || c->key_file)
  244.         av_log(h, AV_LOG_ERROR, "cert and key required\n");
  245.     gnutls_credentials_set(c->session, GNUTLS_CRD_CERTIFICATE, c->cred);
  246.     gnutls_transport_set_ptr(c->session, (gnutls_transport_ptr_t)
  247.                                          (intptr_t) c->fd);
  248.     gnutls_priority_set_direct(c->session, "NORMAL", NULL);
  249.     while (1) {
  250.         ret = gnutls_handshake(c->session);
  251.         if (ret == 0)
  252.             break;
  253.         if ((ret = do_tls_poll(h, ret)) < 0)
  254.             goto fail;
  255.     }
  256.     if (c->verify) {
  257.         unsigned int status, cert_list_size;
  258.         gnutls_x509_crt_t cert;
  259.         const gnutls_datum_t *cert_list;
  260.         if ((ret = gnutls_certificate_verify_peers2(c->session, &status)) < 0) {
  261.             av_log(h, AV_LOG_ERROR, "Unable to verify peer certificate: %s\n",
  262.                                     gnutls_strerror(ret));
  263.             ret = AVERROR(EIO);
  264.             goto fail;
  265.         }
  266.         if (status & GNUTLS_CERT_INVALID) {
  267.             av_log(h, AV_LOG_ERROR, "Peer certificate failed verification\n");
  268.             ret = AVERROR(EIO);
  269.             goto fail;
  270.         }
  271.         if (gnutls_certificate_type_get(c->session) != GNUTLS_CRT_X509) {
  272.             av_log(h, AV_LOG_ERROR, "Unsupported certificate type\n");
  273.             ret = AVERROR(EIO);
  274.             goto fail;
  275.         }
  276.         gnutls_x509_crt_init(&cert);
  277.         cert_list = gnutls_certificate_get_peers(c->session, &cert_list_size);
  278.         gnutls_x509_crt_import(cert, cert_list, GNUTLS_X509_FMT_DER);
  279.         ret = gnutls_x509_crt_check_hostname(cert, host);
  280.         gnutls_x509_crt_deinit(cert);
  281.         if (!ret) {
  282.             av_log(h, AV_LOG_ERROR,
  283.                    "The certificate's owner does not match hostname %s\n", host);
  284.             ret = AVERROR(EIO);
  285.             goto fail;
  286.         }
  287.     }
  288. #elif CONFIG_OPENSSL
  289.     c->ctx = SSL_CTX_new(c->listen ? TLSv1_server_method() : TLSv1_client_method());
  290.     if (!c->ctx) {
  291.         av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
  292.         ret = AVERROR(EIO);
  293.         goto fail;
  294.     }
  295.     set_options(h, uri);
  296.     if (c->ca_file) {
  297.         if (!SSL_CTX_load_verify_locations(c->ctx, c->ca_file, NULL))
  298.             av_log(h, AV_LOG_ERROR, "SSL_CTX_load_verify_locations %s\n", ERR_error_string(ERR_get_error(), NULL));
  299.     }
  300.     if (c->cert_file && !SSL_CTX_use_certificate_chain_file(c->ctx, c->cert_file)) {
  301.         av_log(h, AV_LOG_ERROR, "Unable to load cert file %s: %s\n",
  302.                c->cert_file, ERR_error_string(ERR_get_error(), NULL));
  303.         ret = AVERROR(EIO);
  304.         goto fail;
  305.     }
  306.     if (c->key_file && !SSL_CTX_use_PrivateKey_file(c->ctx, c->key_file, SSL_FILETYPE_PEM)) {
  307.         av_log(h, AV_LOG_ERROR, "Unable to load key file %s: %s\n",
  308.                c->key_file, ERR_error_string(ERR_get_error(), NULL));
  309.         ret = AVERROR(EIO);
  310.         goto fail;
  311.     }
  312.     // Note, this doesn't check that the peer certificate actually matches
  313.     // the requested hostname.
  314.     if (c->verify)
  315.         SSL_CTX_set_verify(c->ctx, SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT, NULL);
  316.     c->ssl = SSL_new(c->ctx);
  317.     if (!c->ssl) {
  318.         av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
  319.         ret = AVERROR(EIO);
  320.         goto fail;
  321.     }
  322.     SSL_set_fd(c->ssl, c->fd);
  323.     if (!c->listen && !numerichost)
  324.         SSL_set_tlsext_host_name(c->ssl, host);
  325.     while (1) {
  326.         ret = c->listen ? SSL_accept(c->ssl) : SSL_connect(c->ssl);
  327.         if (ret > 0)
  328.             break;
  329.         if (ret == 0) {
  330.             av_log(h, AV_LOG_ERROR, "Unable to negotiate TLS/SSL session\n");
  331.             ret = AVERROR(EIO);
  332.             goto fail;
  333.         }
  334.         if ((ret = do_tls_poll(h, ret)) < 0)
  335.             goto fail;
  336.     }
  337. #endif
  338.     return 0;
  339. fail:
  340.     TLS_free(c);
  341.     if (c->tcp)
  342.         ffurl_close(c->tcp);
  343.     ff_tls_deinit();
  344.     return ret;
  345. }
  346.  
  347. static int tls_read(URLContext *h, uint8_t *buf, int size)
  348. {
  349.     TLSContext *c = h->priv_data;
  350.     while (1) {
  351.         int ret = TLS_read(c, buf, size);
  352.         if (ret > 0)
  353.             return ret;
  354.         if (ret == 0)
  355.             return AVERROR_EOF;
  356.         if ((ret = do_tls_poll(h, ret)) < 0)
  357.             return ret;
  358.     }
  359.     return 0;
  360. }
  361.  
  362. static int tls_write(URLContext *h, const uint8_t *buf, int size)
  363. {
  364.     TLSContext *c = h->priv_data;
  365.     while (1) {
  366.         int ret = TLS_write(c, buf, size);
  367.         if (ret > 0)
  368.             return ret;
  369.         if (ret == 0)
  370.             return AVERROR_EOF;
  371.         if ((ret = do_tls_poll(h, ret)) < 0)
  372.             return ret;
  373.     }
  374.     return 0;
  375. }
  376.  
  377. static int tls_close(URLContext *h)
  378. {
  379.     TLSContext *c = h->priv_data;
  380.     TLS_shutdown(c);
  381.     TLS_free(c);
  382.     ffurl_close(c->tcp);
  383.     ff_tls_deinit();
  384.     return 0;
  385. }
  386.  
  387. URLProtocol ff_tls_protocol = {
  388.     .name           = "tls",
  389.     .url_open       = tls_open,
  390.     .url_read       = tls_read,
  391.     .url_write      = tls_write,
  392.     .url_close      = tls_close,
  393.     .priv_data_size = sizeof(TLSContext),
  394.     .flags          = URL_PROTOCOL_FLAG_NETWORK,
  395.     .priv_data_class = &tls_class,
  396. };
  397.