/* * TLS/SSL Protocol * Copyright (c) 2011 Martin Storsjo * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; 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/parseutils.h" #if CONFIG_GNUTLS #include <gnutls/gnutls.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 #include "network.h" #include "os_support.h" #include "internal.h" #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; } TLSContext; static int do_tls_poll(URLContext *h, int ret) { TLSContext *c = h->priv_data; struct pollfd p = { c->fd, 0, 0 }; #if CONFIG_GNUTLS if (ret != GNUTLS_E_AGAIN && ret != GNUTLS_E_INTERRUPTED) { 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], key[1024]; int has_cert, has_key, verify = 0; #if CONFIG_GNUTLS int ret; #endif const char *p = strchr(uri, '?'); if (!p) return; if (av_find_info_tag(buf, sizeof(buf), "cafile", p)) { #if CONFIG_GNUTLS ret = gnutls_certificate_set_x509_trust_file(c->cred, buf, GNUTLS_X509_FMT_PEM); if (ret < 0) av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret)); #elif CONFIG_OPENSSL if (!SSL_CTX_load_verify_locations(c->ctx, buf, NULL)) av_log(h, AV_LOG_ERROR, "SSL_CTX_load_verify_locations %s\n", ERR_error_string(ERR_get_error(), NULL)); #endif } if (av_find_info_tag(buf, sizeof(buf), "verify", p)) { char *endptr = NULL; verify = strtol(buf, &endptr, 10); if (buf == endptr) verify = 1; } has_cert = av_find_info_tag(buf, sizeof(buf), "cert", p); has_key = av_find_info_tag(key, sizeof(key), "key", p); #if CONFIG_GNUTLS if (has_cert && has_key) { ret = gnutls_certificate_set_x509_key_file(c->cred, buf, key, GNUTLS_X509_FMT_PEM); if (ret < 0) av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret)); } else if (has_cert ^ has_key) { av_log(h, AV_LOG_ERROR, "cert and key required\n"); } gnutls_certificate_set_verify_flags(c->cred, verify); #elif CONFIG_OPENSSL if (has_cert && !SSL_CTX_use_certificate_chain_file(c->ctx, buf)) av_log(h, AV_LOG_ERROR, "SSL_CTX_use_certificate_chain_file %s\n", ERR_error_string(ERR_get_error(), NULL)); if (has_key && !SSL_CTX_use_PrivateKey_file(c->ctx, key, SSL_FILETYPE_PEM)) av_log(h, AV_LOG_ERROR, "SSL_CTX_use_PrivateKey_file %s\n", ERR_error_string(ERR_get_error(), NULL)); if (verify) SSL_CTX_set_verify(c->ctx, SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT, 0); #endif } 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], path[1024]; int numerichost = 0; struct addrinfo hints = { 0 }, *ai = NULL; const char *proxy_path; int use_proxy; int server = 0; const char *p = strchr(uri, '?'); if (p && av_find_info_tag(buf, sizeof(buf), "listen", p)) server = 1; ff_tls_init(); av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, path, sizeof(path), uri); ff_url_join(buf, sizeof(buf), "tcp", NULL, host, port, "%s", path); 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 != NULL && 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, server ? GNUTLS_SERVER : GNUTLS_CLIENT); if (!numerichost) gnutls_server_name_set(c->session, GNUTLS_NAME_DNS, host, strlen(host)); gnutls_certificate_allocate_credentials(&c->cred); set_options(h, uri); 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; } #elif CONFIG_OPENSSL c->ctx = SSL_CTX_new(server ? 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); 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 (!server && !numerichost) SSL_set_tlsext_host_name(c->ssl, host); while (1) { ret = server ? 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, };