| /* |
| * TLS/SSL Protocol |
| * Copyright (c) 2011 Martin Storsjo |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "avformat.h" |
| #include "url.h" |
| #include "libavutil/avstring.h" |
| #include "libavutil/opt.h" |
| #include "libavutil/parseutils.h" |
| #include "network.h" |
| #include "os_support.h" |
| #include "internal.h" |
| #if CONFIG_GNUTLS |
| #include <gnutls/gnutls.h> |
| #include <gnutls/x509.h> |
| #define TLS_read(c, buf, size) gnutls_record_recv(c->session, buf, size) |
| #define TLS_write(c, buf, size) gnutls_record_send(c->session, buf, size) |
| #define TLS_shutdown(c) gnutls_bye(c->session, GNUTLS_SHUT_RDWR) |
| #define TLS_free(c) do { \ |
| if (c->session) \ |
| gnutls_deinit(c->session); \ |
| if (c->cred) \ |
| gnutls_certificate_free_credentials(c->cred); \ |
| } while (0) |
| #elif CONFIG_OPENSSL |
| #include <openssl/bio.h> |
| #include <openssl/ssl.h> |
| #include <openssl/err.h> |
| #define TLS_read(c, buf, size) SSL_read(c->ssl, buf, size) |
| #define TLS_write(c, buf, size) SSL_write(c->ssl, buf, size) |
| #define TLS_shutdown(c) SSL_shutdown(c->ssl) |
| #define TLS_free(c) do { \ |
| if (c->ssl) \ |
| SSL_free(c->ssl); \ |
| if (c->ctx) \ |
| SSL_CTX_free(c->ctx); \ |
| } while (0) |
| #endif |
| #if HAVE_POLL_H |
| #include <poll.h> |
| #endif |
| |
| typedef struct { |
| const AVClass *class; |
| URLContext *tcp; |
| #if CONFIG_GNUTLS |
| gnutls_session_t session; |
| gnutls_certificate_credentials_t cred; |
| #elif CONFIG_OPENSSL |
| SSL_CTX *ctx; |
| SSL *ssl; |
| #endif |
| int fd; |
| char *ca_file; |
| int verify; |
| char *cert_file; |
| char *key_file; |
| int listen; |
| } TLSContext; |
| |
| #define OFFSET(x) offsetof(TLSContext, x) |
| #define D AV_OPT_FLAG_DECODING_PARAM |
| #define E AV_OPT_FLAG_ENCODING_PARAM |
| static const AVOption options[] = { |
| {"ca_file", "Certificate Authority database file", OFFSET(ca_file), AV_OPT_TYPE_STRING, .flags = D|E }, |
| {"cafile", "Certificate Authority database file", OFFSET(ca_file), AV_OPT_TYPE_STRING, .flags = D|E }, |
| {"tls_verify", "Verify the peer certificate", OFFSET(verify), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, .flags = D|E }, |
| {"cert_file", "Certificate file", OFFSET(cert_file), AV_OPT_TYPE_STRING, .flags = D|E }, |
| {"key_file", "Private key file", OFFSET(key_file), AV_OPT_TYPE_STRING, .flags = D|E }, |
| {"listen", "Listen for incoming connections", OFFSET(listen), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, .flags = D|E }, |
| { NULL } |
| }; |
| |
| static const AVClass tls_class = { |
| .class_name = "tls", |
| .item_name = av_default_item_name, |
| .option = options, |
| .version = LIBAVUTIL_VERSION_INT, |
| }; |
| |
| static int do_tls_poll(URLContext *h, int ret) |
| { |
| TLSContext *c = h->priv_data; |
| struct pollfd p = { c->fd, 0, 0 }; |
| #if CONFIG_GNUTLS |
| switch (ret) { |
| case GNUTLS_E_AGAIN: |
| case GNUTLS_E_INTERRUPTED: |
| break; |
| case GNUTLS_E_WARNING_ALERT_RECEIVED: |
| av_log(h, AV_LOG_WARNING, "%s\n", gnutls_strerror(ret)); |
| break; |
| default: |
| av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret)); |
| return AVERROR(EIO); |
| } |
| if (gnutls_record_get_direction(c->session)) |
| p.events = POLLOUT; |
| else |
| p.events = POLLIN; |
| #elif CONFIG_OPENSSL |
| ret = SSL_get_error(c->ssl, ret); |
| if (ret == SSL_ERROR_WANT_READ) { |
| p.events = POLLIN; |
| } else if (ret == SSL_ERROR_WANT_WRITE) { |
| p.events = POLLOUT; |
| } else { |
| av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL)); |
| return AVERROR(EIO); |
| } |
| #endif |
| if (h->flags & AVIO_FLAG_NONBLOCK) |
| return AVERROR(EAGAIN); |
| while (1) { |
| int n = poll(&p, 1, 100); |
| if (n > 0) |
| break; |
| if (ff_check_interrupt(&h->interrupt_callback)) |
| return AVERROR(EINTR); |
| } |
| return 0; |
| } |
| |
| static void set_options(URLContext *h, const char *uri) |
| { |
| TLSContext *c = h->priv_data; |
| char buf[1024]; |
| const char *p = strchr(uri, '?'); |
| if (!p) |
| return; |
| |
| if (!c->ca_file && av_find_info_tag(buf, sizeof(buf), "cafile", p)) |
| c->ca_file = av_strdup(buf); |
| |
| if (!c->verify && av_find_info_tag(buf, sizeof(buf), "verify", p)) { |
| char *endptr = NULL; |
| c->verify = strtol(buf, &endptr, 10); |
| if (buf == endptr) |
| c->verify = 1; |
| } |
| |
| if (!c->cert_file && av_find_info_tag(buf, sizeof(buf), "cert", p)) |
| c->cert_file = av_strdup(buf); |
| |
| if (!c->key_file && av_find_info_tag(buf, sizeof(buf), "key", p)) |
| c->key_file = av_strdup(buf); |
| } |
| |
| static int tls_open(URLContext *h, const char *uri, int flags) |
| { |
| TLSContext *c = h->priv_data; |
| int ret; |
| int port; |
| char buf[200], host[200], opts[50] = ""; |
| int numerichost = 0; |
| struct addrinfo hints = { 0 }, *ai = NULL; |
| const char *proxy_path; |
| int use_proxy; |
| const char *p = strchr(uri, '?'); |
| |
| ff_tls_init(); |
| |
| if(p && av_find_info_tag(buf, sizeof(buf), "listen", p)) |
| c->listen = 1; |
| if (c->listen) |
| snprintf(opts, sizeof(opts), "?listen=1"); |
| |
| av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0, uri); |
| ff_url_join(buf, sizeof(buf), "tcp", NULL, host, port, "%s", opts); |
| |
| hints.ai_flags = AI_NUMERICHOST; |
| if (!getaddrinfo(host, NULL, &hints, &ai)) { |
| numerichost = 1; |
| freeaddrinfo(ai); |
| } |
| |
| proxy_path = getenv("http_proxy"); |
| use_proxy = !ff_http_match_no_proxy(getenv("no_proxy"), host) && |
| proxy_path && av_strstart(proxy_path, "http://", NULL); |
| |
| if (use_proxy) { |
| char proxy_host[200], proxy_auth[200], dest[200]; |
| int proxy_port; |
| av_url_split(NULL, 0, proxy_auth, sizeof(proxy_auth), |
| proxy_host, sizeof(proxy_host), &proxy_port, NULL, 0, |
| proxy_path); |
| ff_url_join(dest, sizeof(dest), NULL, NULL, host, port, NULL); |
| ff_url_join(buf, sizeof(buf), "httpproxy", proxy_auth, proxy_host, |
| proxy_port, "/%s", dest); |
| } |
| |
| ret = ffurl_open(&c->tcp, buf, AVIO_FLAG_READ_WRITE, |
| &h->interrupt_callback, NULL); |
| if (ret) |
| goto fail; |
| c->fd = ffurl_get_file_handle(c->tcp); |
| |
| #if CONFIG_GNUTLS |
| gnutls_init(&c->session, c->listen ? GNUTLS_SERVER : GNUTLS_CLIENT); |
| if (!c->listen && !numerichost) |
| gnutls_server_name_set(c->session, GNUTLS_NAME_DNS, host, strlen(host)); |
| gnutls_certificate_allocate_credentials(&c->cred); |
| set_options(h, uri); |
| if (c->ca_file) { |
| ret = gnutls_certificate_set_x509_trust_file(c->cred, c->ca_file, GNUTLS_X509_FMT_PEM); |
| if (ret < 0) |
| av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret)); |
| } |
| #if GNUTLS_VERSION_MAJOR >= 3 |
| else |
| gnutls_certificate_set_x509_system_trust(c->cred); |
| #endif |
| gnutls_certificate_set_verify_flags(c->cred, c->verify ? |
| GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT : 0); |
| if (c->cert_file && c->key_file) { |
| ret = gnutls_certificate_set_x509_key_file(c->cred, |
| c->cert_file, c->key_file, |
| GNUTLS_X509_FMT_PEM); |
| if (ret < 0) { |
| av_log(h, AV_LOG_ERROR, |
| "Unable to set cert/key files %s and %s: %s\n", |
| c->cert_file, c->key_file, gnutls_strerror(ret)); |
| ret = AVERROR(EIO); |
| goto fail; |
| } |
| } else if (c->cert_file || c->key_file) |
| av_log(h, AV_LOG_ERROR, "cert and key required\n"); |
| gnutls_credentials_set(c->session, GNUTLS_CRD_CERTIFICATE, c->cred); |
| gnutls_transport_set_ptr(c->session, (gnutls_transport_ptr_t) |
| (intptr_t) c->fd); |
| gnutls_priority_set_direct(c->session, "NORMAL", NULL); |
| while (1) { |
| ret = gnutls_handshake(c->session); |
| if (ret == 0) |
| break; |
| if ((ret = do_tls_poll(h, ret)) < 0) |
| goto fail; |
| } |
| if (c->verify) { |
| unsigned int status, cert_list_size; |
| gnutls_x509_crt_t cert; |
| const gnutls_datum_t *cert_list; |
| if ((ret = gnutls_certificate_verify_peers2(c->session, &status)) < 0) { |
| av_log(h, AV_LOG_ERROR, "Unable to verify peer certificate: %s\n", |
| gnutls_strerror(ret)); |
| ret = AVERROR(EIO); |
| goto fail; |
| } |
| if (status & GNUTLS_CERT_INVALID) { |
| av_log(h, AV_LOG_ERROR, "Peer certificate failed verification\n"); |
| ret = AVERROR(EIO); |
| goto fail; |
| } |
| if (gnutls_certificate_type_get(c->session) != GNUTLS_CRT_X509) { |
| av_log(h, AV_LOG_ERROR, "Unsupported certificate type\n"); |
| ret = AVERROR(EIO); |
| goto fail; |
| } |
| gnutls_x509_crt_init(&cert); |
| cert_list = gnutls_certificate_get_peers(c->session, &cert_list_size); |
| gnutls_x509_crt_import(cert, cert_list, GNUTLS_X509_FMT_DER); |
| ret = gnutls_x509_crt_check_hostname(cert, host); |
| gnutls_x509_crt_deinit(cert); |
| if (!ret) { |
| av_log(h, AV_LOG_ERROR, |
| "The certificate's owner does not match hostname %s\n", host); |
| ret = AVERROR(EIO); |
| goto fail; |
| } |
| } |
| #elif CONFIG_OPENSSL |
| c->ctx = SSL_CTX_new(c->listen ? TLSv1_server_method() : TLSv1_client_method()); |
| if (!c->ctx) { |
| av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL)); |
| ret = AVERROR(EIO); |
| goto fail; |
| } |
| set_options(h, uri); |
| if (c->ca_file) { |
| if (!SSL_CTX_load_verify_locations(c->ctx, c->ca_file, NULL)) |
| av_log(h, AV_LOG_ERROR, "SSL_CTX_load_verify_locations %s\n", ERR_error_string(ERR_get_error(), NULL)); |
| } |
| if (c->cert_file && !SSL_CTX_use_certificate_chain_file(c->ctx, c->cert_file)) { |
| av_log(h, AV_LOG_ERROR, "Unable to load cert file %s: %s\n", |
| c->cert_file, ERR_error_string(ERR_get_error(), NULL)); |
| ret = AVERROR(EIO); |
| goto fail; |
| } |
| if (c->key_file && !SSL_CTX_use_PrivateKey_file(c->ctx, c->key_file, SSL_FILETYPE_PEM)) { |
| av_log(h, AV_LOG_ERROR, "Unable to load key file %s: %s\n", |
| c->key_file, ERR_error_string(ERR_get_error(), NULL)); |
| ret = AVERROR(EIO); |
| goto fail; |
| } |
| // Note, this doesn't check that the peer certificate actually matches |
| // the requested hostname. |
| if (c->verify) |
| SSL_CTX_set_verify(c->ctx, SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT, NULL); |
| c->ssl = SSL_new(c->ctx); |
| if (!c->ssl) { |
| av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL)); |
| ret = AVERROR(EIO); |
| goto fail; |
| } |
| SSL_set_fd(c->ssl, c->fd); |
| if (!c->listen && !numerichost) |
| SSL_set_tlsext_host_name(c->ssl, host); |
| while (1) { |
| ret = c->listen ? SSL_accept(c->ssl) : SSL_connect(c->ssl); |
| if (ret > 0) |
| break; |
| if (ret == 0) { |
| av_log(h, AV_LOG_ERROR, "Unable to negotiate TLS/SSL session\n"); |
| ret = AVERROR(EIO); |
| goto fail; |
| } |
| if ((ret = do_tls_poll(h, ret)) < 0) |
| goto fail; |
| } |
| #endif |
| return 0; |
| fail: |
| TLS_free(c); |
| if (c->tcp) |
| ffurl_close(c->tcp); |
| ff_tls_deinit(); |
| return ret; |
| } |
| |
| static int tls_read(URLContext *h, uint8_t *buf, int size) |
| { |
| TLSContext *c = h->priv_data; |
| while (1) { |
| int ret = TLS_read(c, buf, size); |
| if (ret > 0) |
| return ret; |
| if (ret == 0) |
| return AVERROR_EOF; |
| if ((ret = do_tls_poll(h, ret)) < 0) |
| return ret; |
| } |
| return 0; |
| } |
| |
| static int tls_write(URLContext *h, const uint8_t *buf, int size) |
| { |
| TLSContext *c = h->priv_data; |
| while (1) { |
| int ret = TLS_write(c, buf, size); |
| if (ret > 0) |
| return ret; |
| if (ret == 0) |
| return AVERROR_EOF; |
| if ((ret = do_tls_poll(h, ret)) < 0) |
| return ret; |
| } |
| return 0; |
| } |
| |
| static int tls_close(URLContext *h) |
| { |
| TLSContext *c = h->priv_data; |
| TLS_shutdown(c); |
| TLS_free(c); |
| ffurl_close(c->tcp); |
| ff_tls_deinit(); |
| return 0; |
| } |
| |
| URLProtocol ff_tls_protocol = { |
| .name = "tls", |
| .url_open = tls_open, |
| .url_read = tls_read, |
| .url_write = tls_write, |
| .url_close = tls_close, |
| .priv_data_size = sizeof(TLSContext), |
| .flags = URL_PROTOCOL_FLAG_NETWORK, |
| .priv_data_class = &tls_class, |
| }; |
