lavf: split tls.c

Move the OpenSSL and GnuTLS implementations to their own files. Other
than the connection code (including options) and some boilerplate, no
code is actually shared.

Signed-off-by: Martin Storsjö <martin@martin.st>

1 files changed, 14 insertions, 361 deletions

diff --git a/libavformat/tls.c b/libavformat/tls.c
index 00fe876a42..eee3fc3d7d 100644
--- a/libavformat/tls.c
+++ b/libavformat/tls.c
@@ -20,209 +20,28 @@
  */
 
 #include "avformat.h"
+#include "internal.h"
+#include "network.h"
+#include "os_support.h"
 #include "url.h"
+#include "tls.h"
 #include "libavutil/avstring.h"
 #include "libavutil/opt.h"
 #include "libavutil/parseutils.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)
-
-static ssize_t gnutls_url_pull(gnutls_transport_ptr_t transport,
-                               void *buf, size_t len)
-{
-    URLContext *h = (URLContext*) transport;
-    int ret = ffurl_read(h, buf, len);
-    if (ret >= 0)
-        return ret;
-    if (ret == AVERROR_EXIT)
-        return 0;
-    errno = EIO;
-    return -1;
-}
-static ssize_t gnutls_url_push(gnutls_transport_ptr_t transport,
-                               const void *buf, size_t len)
-{
-    URLContext *h = (URLContext*) transport;
-    int ret = ffurl_write(h, buf, len);
-    if (ret >= 0)
-        return ret;
-    if (ret == AVERROR_EXIT)
-        return 0;
-    errno = EIO;
-    return -1;
-}
-#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)
-
-static int url_bio_create(BIO *b)
-{
-    b->init = 1;
-    b->ptr = NULL;
-    b->flags = 0;
-    return 1;
-}
-
-static int url_bio_destroy(BIO *b)
-{
-    return 1;
-}
-
-static int url_bio_bread(BIO *b, char *buf, int len)
-{
-    URLContext *h = b->ptr;
-    int ret = ffurl_read(h, buf, len);
-    if (ret >= 0)
-        return ret;
-    BIO_clear_retry_flags(b);
-    if (ret == AVERROR_EXIT)
-        return 0;
-    return -1;
-}
-
-static int url_bio_bwrite(BIO *b, const char *buf, int len)
-{
-    URLContext *h = b->ptr;
-    int ret = ffurl_write(h, buf, len);
-    if (ret >= 0)
-        return ret;
-    BIO_clear_retry_flags(b);
-    if (ret == AVERROR_EXIT)
-        return 0;
-    return -1;
-}
 
-static long url_bio_ctrl(BIO *b, int cmd, long num, void *ptr)
+int ff_tls_open_underlying(TLSShared *c, URLContext *parent, const char *uri, AVDictionary **options)
 {
-    if (cmd == BIO_CTRL_FLUSH) {
-        BIO_clear_retry_flags(b);
-        return 1;
-    }
-    return 0;
-}
-
-static int url_bio_bputs(BIO *b, const char *str)
-{
-    return url_bio_bwrite(b, str, strlen(str));
-}
-
-static BIO_METHOD url_bio_method = {
-    .type = BIO_TYPE_SOURCE_SINK,
-    .name = "urlprotocol bio",
-    .bwrite = url_bio_bwrite,
-    .bread = url_bio_bread,
-    .bputs = url_bio_bputs,
-    .bgets = NULL,
-    .ctrl = url_bio_ctrl,
-    .create = url_bio_create,
-    .destroy = url_bio_destroy,
-};
-
-#endif
-#include "network.h"
-#include "os_support.h"
-#include "internal.h"
-#if HAVE_POLL_H
-#include <poll.h>
-#endif
-
-typedef struct TLSContext {
-    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
-    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 },
-    {"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 print_tls_error(URLContext *h, int ret)
-{
-#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));
-        break;
-    }
-#elif CONFIG_OPENSSL
-    av_log(h, AV_LOG_ERROR, "%s\n", ERR_error_string(ERR_get_error(), NULL));
-#endif
-    return AVERROR(EIO);
-}
-
-static int tls_open(URLContext *h, const char *uri, int flags, AVDictionary **options)
-{
-    TLSContext *c = h->priv_data;
-    int ret;
     int port;
     const char *p;
-    char buf[200], host[200], opts[50] = "";
-    int numerichost = 0;
+    char buf[200], opts[50] = "";
     struct addrinfo hints = { 0 }, *ai = NULL;
     const char *proxy_path;
     int use_proxy;
-#if CONFIG_OPENSSL && !CONFIG_GNUTLS
-    BIO *bio;
-#endif
-
-    ff_tls_init();
 
     if (c->listen)
         snprintf(opts, sizeof(opts), "?listen=1");
 
-    av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port, NULL, 0, uri);
+    av_url_split(NULL, 0, NULL, 0, c->host, sizeof(c->host), &port, NULL, 0, uri);
 
     p = strchr(uri, '?');
 
@@ -233,16 +52,16 @@ static int tls_open(URLContext *h, const char *uri, int flags, AVDictionary **op
             c->listen = 1;
     }
 
-    ff_url_join(buf, sizeof(buf), "tcp", NULL, host, port, "%s", p);
+    ff_url_join(buf, sizeof(buf), "tcp", NULL, c->host, port, "%s", p);
 
     hints.ai_flags = AI_NUMERICHOST;
-    if (!getaddrinfo(host, NULL, &hints, &ai)) {
-        numerichost = 1;
+    if (!getaddrinfo(c->host, NULL, &hints, &ai)) {
+        c->numerichost = 1;
         freeaddrinfo(ai);
     }
 
     proxy_path = getenv("http_proxy");
-    use_proxy = !ff_http_match_no_proxy(getenv("no_proxy"), host) &&
+    use_proxy = !ff_http_match_no_proxy(getenv("no_proxy"), c->host) &&
                 proxy_path && av_strstart(proxy_path, "http://", NULL);
 
     if (use_proxy) {
@@ -251,177 +70,11 @@ static int tls_open(URLContext *h, const char *uri, int flags, AVDictionary **op
         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(dest, sizeof(dest), NULL, NULL, c->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, options);
-    if (ret)
-        goto fail;
-
-#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);
-    if (c->ca_file)
-        gnutls_certificate_set_x509_trust_file(c->cred, c->ca_file, GNUTLS_X509_FMT_PEM);
-#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;
-        }
-    }
-    gnutls_credentials_set(c->session, GNUTLS_CRD_CERTIFICATE, c->cred);
-    gnutls_transport_set_pull_function(c->session, gnutls_url_pull);
-    gnutls_transport_set_push_function(c->session, gnutls_url_push);
-    gnutls_transport_set_ptr(c->session, c->tcp);
-    gnutls_priority_set_direct(c->session, "NORMAL", NULL);
-    ret = gnutls_handshake(c->session);
-    if (ret) {
-        ret = print_tls_error(h, ret);
-        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;
-    }
-    if (c->ca_file)
-        SSL_CTX_load_verify_locations(c->ctx, c->ca_file, 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, 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;
-    }
-    bio = BIO_new(&url_bio_method);
-    bio->ptr = c->tcp;
-    SSL_set_bio(c->ssl, bio, bio);
-    if (!c->listen && !numerichost)
-        SSL_set_tlsext_host_name(c->ssl, host);
-    ret = c->listen ? SSL_accept(c->ssl) : SSL_connect(c->ssl);
-    if (ret == 0) {
-        av_log(h, AV_LOG_ERROR, "Unable to negotiate TLS/SSL session\n");
-        ret = AVERROR(EIO);
-        goto fail;
-    } else if (ret < 0) {
-        ret = print_tls_error(h, ret);
-        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;
-    int ret = TLS_read(c, buf, size);
-    if (ret > 0)
-        return ret;
-    if (ret == 0)
-        return AVERROR_EOF;
-    return print_tls_error(h, ret);
+    return ffurl_open(&c->tcp, buf, AVIO_FLAG_READ_WRITE,
+                      &parent->interrupt_callback, options);
 }
-
-static int tls_write(URLContext *h, const uint8_t *buf, int size)
-{
-    TLSContext *c = h->priv_data;
-    int ret = TLS_write(c, buf, size);
-    if (ret > 0)
-        return ret;
-    if (ret == 0)
-        return AVERROR_EOF;
-    return print_tls_error(h, ret);
-}
-
-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_open2      = 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,
-};