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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6147 | serge | 1 | /* |
| 2 | * TLS/SSL Protocol |
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| 3 | * Copyright (c) 2011 Martin Storsjo |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include |
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| 23 | |||
| 24 | #include |
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| 25 | #include |
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| 26 | |||
| 27 | #include "avformat.h" |
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| 28 | #include "internal.h" |
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| 29 | #include "network.h" |
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| 30 | #include "os_support.h" |
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| 31 | #include "url.h" |
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| 32 | #include "tls.h" |
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| 33 | #include "libavcodec/internal.h" |
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| 34 | #include "libavutil/avstring.h" |
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| 35 | #include "libavutil/opt.h" |
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| 36 | #include "libavutil/parseutils.h" |
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| 37 | |||
| 38 | #if HAVE_THREADS && GNUTLS_VERSION_NUMBER <= 0x020b00 |
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| 39 | #include |
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| 40 | #include "libavutil/thread.h" |
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| 41 | GCRY_THREAD_OPTION_PTHREAD_IMPL; |
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| 42 | #endif |
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| 43 | |||
| 44 | typedef struct TLSContext { |
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| 45 | const AVClass *class; |
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| 46 | TLSShared tls_shared; |
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| 47 | gnutls_session_t session; |
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| 48 | gnutls_certificate_credentials_t cred; |
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| 49 | int need_shutdown; |
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| 50 | } TLSContext; |
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| 51 | |||
| 52 | void ff_gnutls_init(void) |
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| 53 | { |
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| 54 | avpriv_lock_avformat(); |
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| 55 | #if HAVE_THREADS && GNUTLS_VERSION_NUMBER < 0x020b00 |
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| 56 | if (gcry_control(GCRYCTL_ANY_INITIALIZATION_P) == 0) |
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| 57 | gcry_control(GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread); |
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| 58 | #endif |
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| 59 | gnutls_global_init(); |
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| 60 | avpriv_unlock_avformat(); |
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| 61 | } |
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| 62 | |||
| 63 | void ff_gnutls_deinit(void) |
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| 64 | { |
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| 65 | avpriv_lock_avformat(); |
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| 66 | gnutls_global_deinit(); |
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| 67 | avpriv_unlock_avformat(); |
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| 68 | } |
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| 69 | |||
| 70 | static int print_tls_error(URLContext *h, int ret) |
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| 71 | { |
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| 72 | switch (ret) { |
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| 73 | case GNUTLS_E_AGAIN: |
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| 74 | case GNUTLS_E_INTERRUPTED: |
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| 75 | break; |
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| 76 | case GNUTLS_E_WARNING_ALERT_RECEIVED: |
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| 77 | av_log(h, AV_LOG_WARNING, "%s\n", gnutls_strerror(ret)); |
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| 78 | break; |
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| 79 | default: |
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| 80 | av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret)); |
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| 81 | break; |
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| 82 | } |
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| 83 | return AVERROR(EIO); |
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| 84 | } |
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| 85 | |||
| 86 | static int tls_close(URLContext *h) |
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| 87 | { |
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| 88 | TLSContext *c = h->priv_data; |
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| 89 | if (c->need_shutdown) |
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| 90 | gnutls_bye(c->session, GNUTLS_SHUT_WR); |
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| 91 | if (c->session) |
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| 92 | gnutls_deinit(c->session); |
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| 93 | if (c->cred) |
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| 94 | gnutls_certificate_free_credentials(c->cred); |
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| 95 | if (c->tls_shared.tcp) |
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| 96 | ffurl_close(c->tls_shared.tcp); |
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| 97 | ff_gnutls_deinit(); |
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| 98 | return 0; |
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| 99 | } |
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| 100 | |||
| 101 | static ssize_t gnutls_url_pull(gnutls_transport_ptr_t transport, |
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| 102 | void *buf, size_t len) |
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| 103 | { |
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| 104 | URLContext *h = (URLContext*) transport; |
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| 105 | int ret = ffurl_read(h, buf, len); |
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| 106 | if (ret >= 0) |
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| 107 | return ret; |
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| 108 | if (ret == AVERROR_EXIT) |
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| 109 | return 0; |
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| 110 | errno = EIO; |
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| 111 | return -1; |
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| 112 | } |
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| 113 | |||
| 114 | static ssize_t gnutls_url_push(gnutls_transport_ptr_t transport, |
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| 115 | const void *buf, size_t len) |
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| 116 | { |
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| 117 | URLContext *h = (URLContext*) transport; |
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| 118 | int ret = ffurl_write(h, buf, len); |
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| 119 | if (ret >= 0) |
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| 120 | return ret; |
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| 121 | if (ret == AVERROR_EXIT) |
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| 122 | return 0; |
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| 123 | errno = EIO; |
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| 124 | return -1; |
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| 125 | } |
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| 126 | |||
| 127 | static int tls_open(URLContext *h, const char *uri, int flags, AVDictionary **options) |
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| 128 | { |
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| 129 | TLSContext *p = h->priv_data; |
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| 130 | TLSShared *c = &p->tls_shared; |
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| 131 | int ret; |
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| 132 | |||
| 133 | ff_gnutls_init(); |
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| 134 | |||
| 135 | if ((ret = ff_tls_open_underlying(c, h, uri, options)) < 0) |
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| 136 | goto fail; |
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| 137 | |||
| 138 | gnutls_init(&p->session, c->listen ? GNUTLS_SERVER : GNUTLS_CLIENT); |
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| 139 | if (!c->listen && !c->numerichost) |
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| 140 | gnutls_server_name_set(p->session, GNUTLS_NAME_DNS, c->host, strlen(c->host)); |
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| 141 | gnutls_certificate_allocate_credentials(&p->cred); |
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| 142 | if (c->ca_file) { |
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| 143 | ret = gnutls_certificate_set_x509_trust_file(p->cred, c->ca_file, GNUTLS_X509_FMT_PEM); |
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| 144 | if (ret < 0) |
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| 145 | av_log(h, AV_LOG_ERROR, "%s\n", gnutls_strerror(ret)); |
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| 146 | } |
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| 147 | #if GNUTLS_VERSION_NUMBER >= 0x030020 |
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| 148 | else |
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| 149 | gnutls_certificate_set_x509_system_trust(p->cred); |
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| 150 | #endif |
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| 151 | gnutls_certificate_set_verify_flags(p->cred, c->verify ? |
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| 152 | GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT : 0); |
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| 153 | if (c->cert_file && c->key_file) { |
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| 154 | ret = gnutls_certificate_set_x509_key_file(p->cred, |
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| 155 | c->cert_file, c->key_file, |
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| 156 | GNUTLS_X509_FMT_PEM); |
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| 157 | if (ret < 0) { |
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| 158 | av_log(h, AV_LOG_ERROR, |
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| 159 | "Unable to set cert/key files %s and %s: %s\n", |
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| 160 | c->cert_file, c->key_file, gnutls_strerror(ret)); |
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| 161 | ret = AVERROR(EIO); |
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| 162 | goto fail; |
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| 163 | } |
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| 164 | } else if (c->cert_file || c->key_file) |
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| 165 | av_log(h, AV_LOG_ERROR, "cert and key required\n"); |
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| 166 | gnutls_credentials_set(p->session, GNUTLS_CRD_CERTIFICATE, p->cred); |
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| 167 | gnutls_transport_set_pull_function(p->session, gnutls_url_pull); |
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| 168 | gnutls_transport_set_push_function(p->session, gnutls_url_push); |
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| 169 | gnutls_transport_set_ptr(p->session, c->tcp); |
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| 170 | gnutls_priority_set_direct(p->session, "NORMAL", NULL); |
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| 171 | ret = gnutls_handshake(p->session); |
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| 172 | if (ret) { |
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| 173 | ret = print_tls_error(h, ret); |
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| 174 | goto fail; |
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| 175 | } |
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| 176 | p->need_shutdown = 1; |
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| 177 | if (c->verify) { |
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| 178 | unsigned int status, cert_list_size; |
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| 179 | gnutls_x509_crt_t cert; |
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| 180 | const gnutls_datum_t *cert_list; |
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| 181 | if ((ret = gnutls_certificate_verify_peers2(p->session, &status)) < 0) { |
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| 182 | av_log(h, AV_LOG_ERROR, "Unable to verify peer certificate: %s\n", |
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| 183 | gnutls_strerror(ret)); |
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| 184 | ret = AVERROR(EIO); |
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| 185 | goto fail; |
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| 186 | } |
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| 187 | if (status & GNUTLS_CERT_INVALID) { |
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| 188 | av_log(h, AV_LOG_ERROR, "Peer certificate failed verification\n"); |
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| 189 | ret = AVERROR(EIO); |
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| 190 | goto fail; |
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| 191 | } |
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| 192 | if (gnutls_certificate_type_get(p->session) != GNUTLS_CRT_X509) { |
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| 193 | av_log(h, AV_LOG_ERROR, "Unsupported certificate type\n"); |
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| 194 | ret = AVERROR(EIO); |
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| 195 | goto fail; |
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| 196 | } |
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| 197 | gnutls_x509_crt_init(&cert); |
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| 198 | cert_list = gnutls_certificate_get_peers(p->session, &cert_list_size); |
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| 199 | gnutls_x509_crt_import(cert, cert_list, GNUTLS_X509_FMT_DER); |
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| 200 | ret = gnutls_x509_crt_check_hostname(cert, c->host); |
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| 201 | gnutls_x509_crt_deinit(cert); |
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| 202 | if (!ret) { |
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| 203 | av_log(h, AV_LOG_ERROR, |
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| 204 | "The certificate's owner does not match hostname %s\n", c->host); |
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| 205 | ret = AVERROR(EIO); |
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| 206 | goto fail; |
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| 207 | } |
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| 208 | } |
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| 209 | |||
| 210 | return 0; |
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| 211 | fail: |
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| 212 | tls_close(h); |
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| 213 | return ret; |
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| 214 | } |
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| 215 | |||
| 216 | static int tls_read(URLContext *h, uint8_t *buf, int size) |
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| 217 | { |
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| 218 | TLSContext *c = h->priv_data; |
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| 219 | int ret = gnutls_record_recv(c->session, buf, size); |
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| 220 | if (ret > 0) |
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| 221 | return ret; |
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| 222 | if (ret == 0) |
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| 223 | return AVERROR_EOF; |
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| 224 | return print_tls_error(h, ret); |
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| 225 | } |
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| 226 | |||
| 227 | static int tls_write(URLContext *h, const uint8_t *buf, int size) |
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| 228 | { |
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| 229 | TLSContext *c = h->priv_data; |
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| 230 | int ret = gnutls_record_send(c->session, buf, size); |
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| 231 | if (ret > 0) |
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| 232 | return ret; |
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| 233 | if (ret == 0) |
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| 234 | return AVERROR_EOF; |
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| 235 | return print_tls_error(h, ret); |
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| 236 | } |
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| 237 | |||
| 238 | static const AVOption options[] = { |
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| 239 | TLS_COMMON_OPTIONS(TLSContext, tls_shared), |
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| 240 | { NULL } |
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| 241 | }; |
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| 242 | |||
| 243 | static const AVClass tls_class = { |
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| 244 | .class_name = "tls", |
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| 245 | .item_name = av_default_item_name, |
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| 246 | .option = options, |
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| 247 | .version = LIBAVUTIL_VERSION_INT, |
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| 248 | }; |
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| 249 | |||
| 250 | URLProtocol ff_tls_gnutls_protocol = { |
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| 251 | .name = "tls", |
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| 252 | .url_open2 = tls_open, |
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| 253 | .url_read = tls_read, |
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| 254 | .url_write = tls_write, |
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| 255 | .url_close = tls_close, |
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| 256 | .priv_data_size = sizeof(TLSContext), |
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| 257 | .flags = URL_PROTOCOL_FLAG_NETWORK, |
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| 258 | .priv_data_class = &tls_class, |
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| 259 | }; |