gstreamer/ext/curl/gstcurlsshsink.c

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/* GStreamer
* Copyright (C) 2011 Axis Communications <dev-gstreamer@axis.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-curlsshsink
* @title: curlsshsink
* @short_description: sink that uploads data to a server using libcurl
*
* This is a network sink that uses libcurl.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstcurlbasesink.h"
#include "gstcurlsshsink.h"
#include <curl/curl.h>
#include <string.h>
#include <stdio.h>
#ifdef G_OS_WIN32
#include <winsock2.h>
#else
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#endif
#include <sys/types.h>
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>
/* Default values */
#define GST_CAT_DEFAULT gst_curl_ssh_sink_debug
/* Plugin specific settings */
GST_DEBUG_CATEGORY_STATIC (gst_curl_ssh_sink_debug);
enum
{
PROP_0,
PROP_SSH_AUTH_TYPE,
PROP_SSH_PUB_KEYFILE,
PROP_SSH_PRIV_KEYFILE,
PROP_SSH_KEY_PASSPHRASE,
PROP_SSH_KNOWNHOSTS,
PROP_SSH_HOST_PUBLIC_KEY_MD5,
PROP_SSH_ACCEPT_UNKNOWNHOST
};
/* curl SSH-key matching callback */
static gint curl_ssh_sink_sshkey_cb (CURL * easy_handle,
const struct curl_khkey *knownkey, const struct curl_khkey *foundkey,
enum curl_khmatch, void *clientp);
/* Object class function declarations */
static void gst_curl_ssh_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_curl_ssh_sink_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_curl_ssh_sink_finalize (GObject * gobject);
static gboolean gst_curl_ssh_sink_set_options_unlocked (GstCurlBaseSink *
bcsink);
/* private functions */
#define gst_curl_ssh_sink_parent_class parent_class
G_DEFINE_TYPE (GstCurlSshSink, gst_curl_ssh_sink, GST_TYPE_CURL_BASE_SINK);
/* Register the auth types with the GLib type system */
#define GST_TYPE_CURL_SSH_SINK_AUTH_TYPE (gst_curl_ssh_sink_auth_get_type ())
static GType
gst_curl_ssh_sink_auth_get_type (void)
{
static GType gtype = 0;
if (!gtype) {
static const GEnumValue auth_types[] = {
{GST_CURLSSH_AUTH_NONE, "Not allowed", "none"},
{GST_CURLSSH_AUTH_PUBLICKEY, "Public/private key files", "pubkey"},
{GST_CURLSSH_AUTH_PASSWORD, "Password authentication", "password"},
{0, NULL, NULL}
};
gtype = g_enum_register_static ("GstCurlSshAuthType", auth_types);
}
return gtype;
}
static void
gst_curl_ssh_sink_class_init (GstCurlSshSinkClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GST_DEBUG_CATEGORY_INIT (gst_curl_ssh_sink_debug, "curlsshsink", 0,
"curl ssh sink element");
GST_DEBUG_OBJECT (klass, "class_init");
gst_element_class_set_static_metadata (element_class,
"Curl SSH sink", "Sink/Network",
"Upload data over SSH/SFTP using libcurl", "Sorin L. <sorin@axis.com>");
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_curl_ssh_sink_finalize);
gobject_class->set_property = gst_curl_ssh_sink_set_property;
gobject_class->get_property = gst_curl_ssh_sink_get_property;
klass->set_options_unlocked = gst_curl_ssh_sink_set_options_unlocked;
g_object_class_install_property (gobject_class, PROP_SSH_AUTH_TYPE,
g_param_spec_enum ("ssh-auth-type", "SSH authentication type",
"SSH authentication method to authenticate on the SSH/SFTP server",
GST_TYPE_CURL_SSH_SINK_AUTH_TYPE, GST_CURLSSH_AUTH_NONE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_SSH_PUB_KEYFILE,
g_param_spec_string ("ssh-pub-keyfile",
"SSH public key file",
"The complete path & filename of the SSH public key file",
NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_SSH_PRIV_KEYFILE,
g_param_spec_string ("ssh-priv-keyfile",
"SSH private key file",
"The complete path & filename of the SSH private key file",
NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_SSH_KEY_PASSPHRASE,
g_param_spec_string ("ssh-key-passphrase", "Passphrase of the priv key",
"The passphrase used to protect the SSH private key file",
NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_SSH_KNOWNHOSTS,
g_param_spec_string ("ssh-knownhosts",
"SSH known hosts",
"The complete path & filename of the SSH 'known_hosts' file",
NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_SSH_HOST_PUBLIC_KEY_MD5,
g_param_spec_string ("ssh-host-pubkey-md5",
"MD5 checksum of the remote host's public key",
"MD5 checksum (32 hexadecimal digits, case-insensitive) of the "
"remote host's public key",
NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_SSH_ACCEPT_UNKNOWNHOST,
g_param_spec_boolean ("ssh-accept-unknownhost",
"SSH accept unknown host",
"Accept an unknown remote public host key",
FALSE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}
static void
gst_curl_ssh_sink_init (GstCurlSshSink * sink)
{
sink->ssh_auth_type = GST_CURLSSH_AUTH_NONE;
sink->ssh_pub_keyfile = NULL;
sink->ssh_priv_keyfile = NULL;
sink->ssh_key_passphrase = NULL;
sink->ssh_knownhosts = NULL;
sink->ssh_host_public_key_md5 = NULL;
sink->ssh_accept_unknownhost = FALSE;
}
static void
gst_curl_ssh_sink_finalize (GObject * gobject)
{
GstCurlSshSink *this = GST_CURL_SSH_SINK (gobject);
GST_DEBUG ("finalizing curlsshsink");
g_free (this->ssh_pub_keyfile);
g_free (this->ssh_priv_keyfile);
g_free (this->ssh_key_passphrase);
g_free (this->ssh_knownhosts);
g_free (this->ssh_host_public_key_md5);
G_OBJECT_CLASS (parent_class)->finalize (gobject);
}
static void
gst_curl_ssh_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstCurlSshSink *sink;
GstState cur_state;
g_return_if_fail (GST_IS_CURL_SSH_SINK (object));
sink = GST_CURL_SSH_SINK (object);
gst_element_get_state (GST_ELEMENT (sink), &cur_state, NULL, 0);
if (cur_state == GST_STATE_PLAYING || cur_state == GST_STATE_PAUSED) {
return;
}
GST_OBJECT_LOCK (sink);
switch (prop_id) {
case PROP_SSH_AUTH_TYPE:
sink->ssh_auth_type = g_value_get_enum (value);
GST_DEBUG_OBJECT (sink, "ssh_auth_type set to %d", sink->ssh_auth_type);
break;
case PROP_SSH_PUB_KEYFILE:
g_free (sink->ssh_pub_keyfile);
sink->ssh_pub_keyfile = g_value_dup_string (value);
GST_DEBUG_OBJECT (sink, "ssh_pub_keyfile set to %s",
sink->ssh_pub_keyfile);
break;
case PROP_SSH_PRIV_KEYFILE:
g_free (sink->ssh_priv_keyfile);
sink->ssh_priv_keyfile = g_value_dup_string (value);
GST_DEBUG_OBJECT (sink, "ssh_priv_keyfile set to %s",
sink->ssh_priv_keyfile);
break;
case PROP_SSH_KEY_PASSPHRASE:
g_free (sink->ssh_key_passphrase);
sink->ssh_key_passphrase = g_value_dup_string (value);
GST_DEBUG_OBJECT (sink, "ssh_key_passphrase set to %s",
sink->ssh_key_passphrase);
break;
case PROP_SSH_KNOWNHOSTS:
g_free (sink->ssh_knownhosts);
sink->ssh_knownhosts = g_value_dup_string (value);
GST_DEBUG_OBJECT (sink, "ssh_knownhosts set to %s", sink->ssh_knownhosts);
break;
case PROP_SSH_HOST_PUBLIC_KEY_MD5:
g_free (sink->ssh_host_public_key_md5);
sink->ssh_host_public_key_md5 = g_value_dup_string (value);
GST_DEBUG_OBJECT (sink, "ssh_host_public_key_md5 set to %s",
sink->ssh_host_public_key_md5);
break;
case PROP_SSH_ACCEPT_UNKNOWNHOST:
sink->ssh_accept_unknownhost = g_value_get_boolean (value);
GST_DEBUG_OBJECT (sink, "ssh_accept_unknownhost set to %d",
sink->ssh_accept_unknownhost);
break;
default:
GST_DEBUG_OBJECT (sink, "invalid property id %d", prop_id);
break;
}
GST_OBJECT_UNLOCK (sink);
}
static void
gst_curl_ssh_sink_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstCurlSshSink *sink;
g_return_if_fail (GST_IS_CURL_SSH_SINK (object));
sink = GST_CURL_SSH_SINK (object);
switch (prop_id) {
case PROP_SSH_AUTH_TYPE:
g_value_set_enum (value, sink->ssh_auth_type);
break;
case PROP_SSH_PUB_KEYFILE:
g_value_set_string (value, sink->ssh_pub_keyfile);
break;
case PROP_SSH_PRIV_KEYFILE:
g_value_set_string (value, sink->ssh_priv_keyfile);
break;
case PROP_SSH_KEY_PASSPHRASE:
g_value_set_string (value, sink->ssh_key_passphrase);
break;
case PROP_SSH_KNOWNHOSTS:
g_value_set_string (value, sink->ssh_knownhosts);
break;
case PROP_SSH_HOST_PUBLIC_KEY_MD5:
g_value_set_string (value, sink->ssh_host_public_key_md5);
break;
case PROP_SSH_ACCEPT_UNKNOWNHOST:
g_value_set_boolean (value, sink->ssh_accept_unknownhost);
break;
default:
GST_DEBUG_OBJECT (sink, "invalid property id");
break;
}
}
static gboolean
gst_curl_ssh_sink_set_options_unlocked (GstCurlBaseSink * bcsink)
{
GstCurlSshSink *sink = GST_CURL_SSH_SINK (bcsink);
CURLcode curl_err = CURLE_OK;
/* set SSH specific options here */
if (sink->ssh_pub_keyfile) {
if ((curl_err = curl_easy_setopt (bcsink->curl, CURLOPT_SSH_PUBLIC_KEYFILE,
sink->ssh_pub_keyfile)) != CURLE_OK) {
bcsink->error = g_strdup_printf ("failed to set public key file: %s",
curl_easy_strerror (curl_err));
return FALSE;
}
}
if (sink->ssh_priv_keyfile) {
if ((curl_err = curl_easy_setopt (bcsink->curl, CURLOPT_SSH_PRIVATE_KEYFILE,
sink->ssh_priv_keyfile)) != CURLE_OK) {
bcsink->error = g_strdup_printf ("failed to set private key file: %s",
curl_easy_strerror (curl_err));
return FALSE;
}
}
if (sink->ssh_knownhosts) {
if ((curl_err = curl_easy_setopt (bcsink->curl, CURLOPT_SSH_KNOWNHOSTS,
sink->ssh_knownhosts)) != CURLE_OK) {
bcsink->error = g_strdup_printf ("failed to set known_hosts file: %s",
curl_easy_strerror (curl_err));
return FALSE;
}
}
if (sink->ssh_host_public_key_md5) {
/* libcurl is freaking tricky. If the input string is not exactly 32
* hexdigits long it silently ignores CURLOPT_SSH_HOST_PUBLIC_KEY_MD5 and
* performs the transfer without authenticating the server! */
if (strlen (sink->ssh_host_public_key_md5) != 32) {
bcsink->error = g_strdup ("MD5-hash string has invalid length, "
"must be exactly 32 hexdigits!");
return FALSE;
}
if ((curl_err =
curl_easy_setopt (bcsink->curl, CURLOPT_SSH_HOST_PUBLIC_KEY_MD5,
sink->ssh_host_public_key_md5)) != CURLE_OK) {
bcsink->error = g_strdup_printf ("failed to set remote host's public "
"key MD5: %s", curl_easy_strerror (curl_err));
return FALSE;
}
}
/* make sure we only accept PASSWORD or PUBLICKEY auth methods
* (can be extended later) */
if (sink->ssh_auth_type == GST_CURLSSH_AUTH_PASSWORD ||
sink->ssh_auth_type == GST_CURLSSH_AUTH_PUBLICKEY) {
/* set the SSH_AUTH_TYPE */
if ((curl_err = curl_easy_setopt (bcsink->curl, CURLOPT_SSH_AUTH_TYPES,
sink->ssh_auth_type)) != CURLE_OK) {
bcsink->error = g_strdup_printf ("failed to set authentication type: %s",
curl_easy_strerror (curl_err));
return FALSE;
}
/* if key authentication -> provide the private key passphrase as well */
if (sink->ssh_auth_type == GST_CURLSSH_AUTH_PUBLICKEY) {
if (sink->ssh_key_passphrase) {
if ((curl_err = curl_easy_setopt (bcsink->curl, CURLOPT_KEYPASSWD,
sink->ssh_key_passphrase)) != CURLE_OK) {
bcsink->error = g_strdup_printf ("failed to set private key "
"passphrase: %s", curl_easy_strerror (curl_err));
return FALSE;
}
} else {
/* The user did not provide the passphrase for the private key.
* This can still be a valid situation, if (s)he chose not to
* protect the private key with a passphrase - but not recommended! */
GST_WARNING_OBJECT (sink, "Warning: key authentication chosen but "
"'ssh-key-passphrase' not provided!");
}
}
} else {
bcsink->error = g_strdup_printf ("Error: unsupported authentication type: "
"%d.", sink->ssh_auth_type);
return FALSE;
}
/* Install the SSH_KEYFUNCTION callback...
* IMPORTANT: this callback gets called only if CURLOPT_SSH_KNOWNHOSTS
* is also set! */
if ((curl_err = curl_easy_setopt (bcsink->curl, CURLOPT_SSH_KEYFUNCTION,
curl_ssh_sink_sshkey_cb)) != CURLE_OK) {
bcsink->error = g_strdup_printf ("failed to set SSH_KEYFUNCTION callback: "
"%s", curl_easy_strerror (curl_err));
return FALSE;
}
/* SSH_KEYFUNCTION callback successfully installed so go on and
* set the '*clientp' parameter as well */
if ((curl_err =
curl_easy_setopt (bcsink->curl, CURLOPT_SSH_KEYDATA,
sink)) != CURLE_OK) {
bcsink->error = g_strdup_printf ("failed to set CURLOPT_SSH_KEYDATA: %s",
curl_easy_strerror (curl_err));
return FALSE;
}
return TRUE;
}
/* A 'curl_sshkey_cb' callback function. It gets called when the known_host
* matching has been done, to allow the application to act and decide for
* libcurl how to proceed.
* The callback will only be called if CURLOPT_SSH_KNOWNHOSTS is also set!
* NOTE:
* * use CURLOPT_SSH_KEYFUNCTION to install the callback func
* * use CURLOPT_SSH_KEYDATA to pass in the actual "*clientp"
*/
static gint
curl_ssh_sink_sshkey_cb (CURL * easy_handle, /* easy handle */
const struct curl_khkey *knownkey, /* known - key from known_hosts */
const struct curl_khkey *foundkey, /* found - key from remote end */
enum curl_khmatch match, /* libcurl's view on the keys */
void *clientp)
{
GstCurlSshSink *sink = (GstCurlSshSink *) clientp;
/* the default action to be taken upon pub key matching */
guint res_action = CURLKHSTAT_REJECT;
switch (match) {
case CURLKHMATCH_OK:
res_action = CURLKHSTAT_FINE;
GST_INFO_OBJECT (sink,
"Remote public host key is matching known_hosts, OK to proceed.");
break;
case CURLKHMATCH_MISMATCH:
GST_WARNING_OBJECT (sink,
"Remote public host key mismatch in known_hosts, aborting "
"connection.");
/* Reject the connection. The old mismatching key has to be manually
* removed from 'known_hosts' before being able to connect again to
* the respective host. */
break;
case CURLKHMATCH_MISSING:
GST_OBJECT_LOCK (sink);
if (sink->ssh_accept_unknownhost == TRUE) {
/* the key was not found in known_hosts but the user chose to
* accept it */
res_action = CURLKHSTAT_FINE_ADD_TO_FILE;
GST_INFO_OBJECT (sink, "Accepting and adding new public host key to "
"known_hosts.");
} else {
/* the key was not found in known_hosts and the user chose not
* to accept connections to unknown hosts */
GST_WARNING_OBJECT (sink,
"Remote public host key is unknown, rejecting connection.");
}
GST_OBJECT_UNLOCK (sink);
break;
default:
/* something went wrong, we got some bogus key match result */
GST_CURL_BASE_SINK (sink)->error =
g_strdup ("libcurl internal error during known_host matching");
break;
}
return res_action;
}