serverutils.c File Reference

GnuTLS based functions for server communication. More...

#include "serverutils.h"
#include "../base/hosts.h"
#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <gcrypt.h>
#include <glib.h>
#include <gnutls/x509.h>
#include <netdb.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>

Include dependency graph for serverutils.c:

Go to the source code of this file.

Macros
#define	_GNU_SOURCE
#define	G_LOG_DOMAIN   "lib serv"
	GLib log domain. More...

Functions
static int	server_attach_internal (int socket, gnutls_session_t *session, const char *host, int port)
	Attach a socket to a session, and shake hands with the peer. More...
static int	server_new_internal (unsigned int end_type, const char *priority, const gchar *ca_cert_file, const gchar *cert_file, const gchar *key_file, gnutls_session_t *server_session, gnutls_certificate_credentials_t *server_credentials)
	Make a session for connecting to a server. More...
static int	close_unix (gvm_connection_t *client_connection)
	Close UNIX socket connection. More...
void	gvm_connection_free (gvm_connection_t *client_connection)
	Free connection. More...
int	gvm_server_verify (gnutls_session_t session)
	Verify certificate. More...
int	load_gnutls_file (const char *file, gnutls_datum_t *loaded_file)
	Loads a file's data into gnutls_datum_t struct. More...
void	unload_gnutls_file (gnutls_datum_t *data)
	Unloads a gnutls_datum_t struct's data. More...
static void	set_cert_pub_mem (const char *data)
	Save cert_pub_mem with public certificate. More...
static void	set_cert_priv_mem (const char *data)
	Save cert_priv_mem with private certificate. More...
static const char *	get_cert_priv_mem ()
	Get private certificate from cert_priv_mem. More...
static const char *	get_cert_pub_mem ()
	Get public certificate from cert_pub_mem. More...
static int	client_cert_callback (gnutls_session_t session, const gnutls_datum_t *req_ca_rdn, int nreqs, const gnutls_pk_algorithm_t *sign_algos, int sign_algos_length, gnutls_retr2_st *st)
	Callback function to be called in order to retrieve the certificate to be used in the handshake. More...
int	gvm_server_open_verify (gnutls_session_t *session, const char *host, int port, const char *ca_mem, const char *pub_mem, const char *priv_mem, int verify)
	Connect to the server using a given host, port and cert. More...
int	gvm_server_open_with_cert (gnutls_session_t *session, const char *host, int port, const char *ca_mem, const char *pub_mem, const char *priv_mem)
	Connect to the server using a given host, port and cert. More...
int	gvm_server_open (gnutls_session_t *session, const char *host, int port)
	Connect to the server using a given host and port. More...
int	gvm_server_close (int socket, gnutls_session_t session)
	Close a server connection and its socket. More...
void	gvm_connection_close (gvm_connection_t *connection)
	Close a server connection and its socket. More...
int	gvm_server_attach (int socket, gnutls_session_t *session)
	Attach a socket to a session, and shake hands with the peer. More...
static int	gvm_server_vsendf_internal (gnutls_session_t *session, const char *fmt, va_list ap, int quiet)
	Send a string to the server. More...
static int	unix_vsendf_internal (int socket, const char *fmt, va_list ap, int quiet)
	Send a string to the server. More...
static int	gvm_connection_vsendf_internal (gvm_connection_t *connection, const char *fmt, va_list ap, int quiet)
	Send a string to the connection. More...
int	gvm_server_vsendf (gnutls_session_t *session, const char *fmt, va_list ap)
	Send a string to the server. More...
int	gvm_socket_vsendf (int socket, const char *fmt, va_list ap)
	Send a string to the server. More...
int	gvm_connection_vsendf (gvm_connection_t *connection, const char *fmt, va_list ap)
	Send a string to the server. More...
int	gvm_server_vsendf_quiet (gnutls_session_t *session, const char *fmt, va_list ap)
	Send a string to the server, refraining from logging besides warnings. More...
int	gvm_connection_vsendf_quiet (gvm_connection_t *connection, const char *fmt, va_list ap)
	Send a string to the server, refraining from logging besides warnings. More...
int	gvm_server_sendf (gnutls_session_t *session, const char *format,...)
	Format and send a string to the server. More...
int	gvm_connection_sendf (gvm_connection_t *connection, const char *format,...)
	Format and send a string to the server. More...
int	gvm_server_sendf_quiet (gnutls_session_t *session, const char *format,...)
	Format and send a string to the server. More...
int	gvm_connection_sendf_quiet (gvm_connection_t *connection, const char *format,...)
	Format and send a string to the server. More...
int	gvm_server_sendf_xml (gnutls_session_t *session, const char *format,...)
	Format and send an XML string to the server. More...
int	gvm_connection_sendf_xml (gvm_connection_t *connection, const char *format,...)
	Format and send an XML string to the server. More...
int	gvm_server_sendf_xml_quiet (gnutls_session_t *session, const char *format,...)
	Format and send an XML string to the server. More...
int	gvm_connection_sendf_xml_quiet (gvm_connection_t *connection, const char *format,...)
	Format and send an XML string to the server. More...
static int	server_new_gnutls_init (gnutls_certificate_credentials_t *server_credentials)
	Initialize a server session. More...
static int	server_new_gnutls_set (unsigned int end_type, const char *priority, gnutls_session_t *server_session, gnutls_certificate_credentials_t *server_credentials)
	Set the server credencials. More...
int	gvm_server_new (unsigned int end_type, gchar *ca_cert_file, gchar *cert_file, gchar *key_file, gnutls_session_t *server_session, gnutls_certificate_credentials_t *server_credentials)
	Make a session for connecting to a server. More...
int	gvm_server_new_mem (unsigned int end_type, const char *ca_cert, const char *pub_key, const char *priv_key, gnutls_session_t *session, gnutls_certificate_credentials_t *credentials)
	Make a session for connecting to a server, with certificates stored in memory. More...
int	set_gnutls_dhparams (gnutls_certificate_credentials_t creds, const char *dhparams_file)
	Set a gnutls session's Diffie-Hellman parameters. More...
int	gvm_server_free (int server_socket, gnutls_session_t server_session, gnutls_certificate_credentials_t server_credentials)
	Cleanup a server session. More...

Variables
struct sockaddr_in	address
	Server address. More...
static char *	cert_pub_mem = NULL
static char *	cert_priv_mem = NULL

Detailed Description

GnuTLS based functions for server communication.

This library supplies low-level communication functions for communication with a server over GnuTLS.

Definition in file serverutils.c.

Macro Definition Documentation

_GNU_SOURCE

#define _GNU_SOURCE

Definition at line 28 of file serverutils.c.

G_LOG_DOMAIN

#define G_LOG_DOMAIN   "lib serv"

GLib log domain.

Definition at line 52 of file serverutils.c.

Function Documentation

client_cert_callback()

static int client_cert_callback ( gnutls_session_t  session, const gnutls_datum_t *  req_ca_rdn, int  nreqs, const gnutls_pk_algorithm_t *  sign_algos, int  sign_algos_length, gnutls_retr2_st *  st  )

static

Callback function to be called in order to retrieve the certificate to be used in the handshake.

Parameters

[in]	session	Pointer to GNUTLS session. Not in used. Can be NULL.
[in]	req_ca_rdn	Contains a list with the CA names that the server considers trusted. Not in used. Can be NULL.
[in]	nreqs	Number of CA requested. Not in used. Can be NULL.
[in]	sign_algos	contains a list with server's acceptable public key algorithms. Not in used. Can be NULL.
[in]	sign_algos_length	Algos list length. Not in used. Can be NULL.
[out]	st	Should contain the certificates and private keys

Returns

0 on success, non-null otherwise.

Definition at line 275 of file serverutils.c.

{
  int ret;
  gnutls_datum_t data;
  static gnutls_x509_crt_t crt;
  static gnutls_x509_privkey_t key;

  (void) session;
  (void) req_ca_rdn;
  (void) nreqs;
  (void) sign_algos;
  (void) sign_algos_length;
  data.data = (unsigned char *) g_strdup (get_cert_pub_mem ());
  data.size = strlen (get_cert_pub_mem ());
  gnutls_x509_crt_init (&crt);
  ret = gnutls_x509_crt_import (crt, &data, GNUTLS_X509_FMT_PEM);
  g_free (data.data);
  if (ret)
    return ret;
  st->cert.x509 = &crt;
  st->cert_type = GNUTLS_CRT_X509;
  st->ncerts = 1;

  data.data = (unsigned char *) g_strdup (get_cert_priv_mem ());
  data.size = strlen (get_cert_priv_mem ());
  gnutls_x509_privkey_init (&key);
  ret = gnutls_x509_privkey_import (key, &data, GNUTLS_X509_FMT_PEM);
  g_free (data.data);
  if (ret)
    return ret;
  st->key.x509 = key;
  st->key_type = GNUTLS_PRIVKEY_X509;
  return 0;
}

References get_cert_priv_mem(), and get_cert_pub_mem().

Referenced by gvm_server_open_verify().

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close_unix()

static int close_unix ( gvm_connection_t *  client_connection )

static

Close UNIX socket connection.

Parameters

[in]

client_connection

Client connection.

Returns

0 success, -1 error.

Definition at line 76 of file serverutils.c.

{
  /* Turn off blocking. */
  if (fcntl (client_connection->socket, F_SETFL, O_NONBLOCK) == -1)
    {
      g_warning ("%s: failed to set server socket flag: %s\n", __FUNCTION__,
                 strerror (errno));
      return -1;
    }

  if (shutdown (client_connection->socket, SHUT_RDWR) == -1)
    {
      if (errno == ENOTCONN)
        return 0;
      g_warning ("%s: failed to shutdown server socket: %s\n", __FUNCTION__,
                 strerror (errno));
      return -1;
    }

  if (close (client_connection->socket) == -1)
    {
      g_warning ("%s: failed to close server socket: %s\n", __FUNCTION__,
                 strerror (errno));
      return -1;
    }

  return 0;
}

References gvm_connection_t::socket.

Referenced by gvm_connection_free().

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get_cert_priv_mem()

static const char* get_cert_priv_mem ( )

static

Get private certificate from cert_priv_mem.

Returns

The DER or PEM encoded certificate.

Definition at line 246 of file serverutils.c.

{
  return cert_priv_mem;
}

References cert_priv_mem.

Referenced by client_cert_callback().

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get_cert_pub_mem()

static const char* get_cert_pub_mem ( )

static

Get public certificate from cert_pub_mem.

Returns

The DER or PEM encoded certificate.

Definition at line 256 of file serverutils.c.

{
  return cert_pub_mem;
}

References cert_pub_mem.

Referenced by client_cert_callback().

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gvm_connection_close()

void gvm_connection_close

(

gvm_connection_t *

connection

)

Close a server connection and its socket.

Parameters

[in]

connection

Connection.

Returns

0 on success, -1 on error.

Definition at line 520 of file serverutils.c.

{
  gvm_connection_free (connection);
}

References gvm_connection_free().

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gvm_connection_free()

void gvm_connection_free

(

gvm_connection_t *

client_connection

)

Free connection.

Parameters

[in]

client_connection

Connection.

Definition at line 111 of file serverutils.c.

{
  if (client_connection->tls)
    gvm_server_free (client_connection->socket, client_connection->session,
                     client_connection->credentials);
  else
    close_unix (client_connection);
}

References close_unix(), gvm_connection_t::credentials, gvm_server_free(), gvm_connection_t::session, gvm_connection_t::socket, and gvm_connection_t::tls.

Referenced by gvm_connection_close().

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gvm_connection_sendf()

int gvm_connection_sendf	(	gvm_connection_t *	connection,
		const char *	format,
			...
	)

Format and send a string to the server.

Parameters

[in]	connection	Connection.
[in]	format	printf-style format string for message.

Returns

0 on success, -1 on error.

Definition at line 839 of file serverutils.c.

{
  va_list ap;
  int rc;

  va_start (ap, format);
  rc = gvm_connection_vsendf (connection, format, ap);
  va_end (ap);
  return rc;
}

References gvm_connection_vsendf().

Referenced by gmp_ping_c(), gmp_resume_task_report_c(), gmp_start_task_report_c(), gmp_stop_task_c(), and gvm_connection_sendf_xml().

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gvm_connection_sendf_quiet()

int gvm_connection_sendf_quiet	(	gvm_connection_t *	connection,
		const char *	format,
			...
	)

Format and send a string to the server.

Parameters

[in]	connection	Connection.
[in]	format	printf-style format string for message.

Returns

0 on success, -1 on error.

Definition at line 879 of file serverutils.c.

{
  va_list ap;
  int rc;

  va_start (ap, format);
  rc = gvm_connection_vsendf_quiet (connection, format, ap);
  va_end (ap);
  return rc;
}

References gvm_connection_vsendf_quiet().

Referenced by gvm_connection_sendf_xml_quiet().

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gvm_connection_sendf_xml()

int gvm_connection_sendf_xml	(	gvm_connection_t *	connection,
		const char *	format,
			...
	)

Format and send an XML string to the server.

Escape XML in string and character args.

Parameters

[in]	connection	Connection.
[in]	format	printf-style format string for message.

Returns

0 on success, -1 on error.

Definition at line 927 of file serverutils.c.

{
  va_list ap;
  gchar *msg;
  int rc;

  va_start (ap, format);
  msg = g_markup_vprintf_escaped (format, ap);
  rc = gvm_connection_sendf (connection, "%s", msg);
  g_free (msg);
  va_end (ap);
  return rc;
}

References gvm_connection_sendf().

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gvm_connection_sendf_xml_quiet()

int gvm_connection_sendf_xml_quiet	(	gvm_connection_t *	connection,
		const char *	format,
			...
	)

Format and send an XML string to the server.

Escape XML in string and character args.

Quiet version, only logs warnings.

Parameters

[in]	connection	Connection.
[in]	format	printf-style format string for message.

Returns

0 on success, -1 on error.

Definition at line 981 of file serverutils.c.

{
  va_list ap;
  gchar *msg;
  int rc;

  va_start (ap, format);
  msg = g_markup_vprintf_escaped (format, ap);
  rc = gvm_connection_sendf_quiet (connection, "%s", msg);
  g_free (msg);
  va_end (ap);
  return rc;
}

References gvm_connection_sendf_quiet().

Referenced by gmp_authenticate_info_ext_c().

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gvm_connection_vsendf()

int gvm_connection_vsendf	(	gvm_connection_t *	connection,
		const char *	fmt,
		va_list	ap
	)

Send a string to the server.

Parameters

[in]	connection	Connection.
[in]	fmt	Format of string to send.
[in]	ap	Args for fmt.

Returns

0 on success, 1 if server closed connection, -1 on error.

Definition at line 773 of file serverutils.c.

{
  return gvm_connection_vsendf_internal (connection, fmt, ap, 0);
}

References gvm_connection_vsendf_internal().

Referenced by gvm_connection_sendf().

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gvm_connection_vsendf_internal()

static int gvm_connection_vsendf_internal ( gvm_connection_t *  connection, const char *  fmt, va_list  ap, int  quiet  )

static

Send a string to the connection.

Parameters

[in]	connection	Connection.
[in]	fmt	Format of string to send.
[in]	ap	Args for fmt.
[in]	quiet	Whether to log debug and info messages. Useful for hiding passwords.

Returns

0 on success, 1 if server closed connection, -1 on error.

Definition at line 725 of file serverutils.c.

{
  if (connection->tls)
    return gvm_server_vsendf_internal (&connection->session, fmt, ap, quiet);
  return unix_vsendf_internal (connection->socket, fmt, ap, quiet);
}

References gvm_server_vsendf_internal(), gvm_connection_t::session, gvm_connection_t::socket, gvm_connection_t::tls, and unix_vsendf_internal().

Referenced by gvm_connection_vsendf(), and gvm_connection_vsendf_quiet().

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gvm_connection_vsendf_quiet()

int gvm_connection_vsendf_quiet	(	gvm_connection_t *	connection,
		const char *	fmt,
		va_list	ap
	)

Send a string to the server, refraining from logging besides warnings.

Parameters

[in]	connection	Connection.
[in]	fmt	Format of string to send.
[in]	ap	Args for fmt.

Returns

0 on success, 1 if server closed connection, -1 on error.

Definition at line 804 of file serverutils.c.

{
  return gvm_connection_vsendf_internal (connection, fmt, ap, 1);
}

References gvm_connection_vsendf_internal().

Referenced by gvm_connection_sendf_quiet().

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gvm_server_attach()

int gvm_server_attach	(	int	socket,
		gnutls_session_t *	session
	)

Attach a socket to a session, and shake hands with the peer.

Parameters

[in]	socket	Socket.
[in]	session	Pointer to GNUTLS session. FIXME: Why is this a pointer to a session?

Returns

0 on success, -1 on error.

Definition at line 585 of file serverutils.c.

{
  int ret;

  ret = server_attach_internal (socket, session, NULL, 0);
  return ret ? -1 : 0;
}

References server_attach_internal().

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gvm_server_close()

int gvm_server_close	(	int	socket,
		gnutls_session_t	session
	)

Close a server connection and its socket.

Parameters

[in]	socket	Socket connected to server.
[in]	session	GNUTLS session with server.

Returns

0 on success, -1 on error.

Definition at line 507 of file serverutils.c.

{
  return gvm_server_free (socket, session, NULL);
}

References gvm_server_free().

Referenced by osp_connection_close().

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gvm_server_free()

int gvm_server_free	(	int	server_socket,
		gnutls_session_t	server_session,
		gnutls_certificate_credentials_t	server_credentials
	)

Cleanup a server session.

This shuts down the TLS session, closes the socket and releases the TLS resources.

Parameters

[in]	server_socket	The socket connected to the server.
[in]	server_session	The session with the server.
[in]	server_credentials	Credentials or NULL.

Returns

0 success, -1 error.

Definition at line 1273 of file serverutils.c.

{
  /* Turn off blocking. */
  // FIX get flags first
  if (fcntl (server_socket, F_SETFL, O_NONBLOCK) == -1)
    {
      g_warning ("%s: failed to set server socket flag: %s\n", __FUNCTION__,
                 strerror (errno));
      return -1;
    }

  while (1)
    {
      int ret = gnutls_bye (server_session, GNUTLS_SHUT_WR);
      if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
        {
          continue;
        }
      if (ret)
        {
          g_debug ("   Failed to gnutls_bye: %s\n",
                   gnutls_strerror ((int) ret));
          /* Carry on successfully anyway, as this often fails, perhaps
           * because the server is closing the connection first. */
          break;
        }
      break;
    }

  /* The former separate code in gvm_server_close and here
     differed in the order the TLS session and socket was closed.  The
     way we do it here seems to be the right thing but for full
     backward compatibility we do it for calls from
     gvm_server_close in the old way.  We can distinguish the two
     modes by the existence of server_credentials.  */
  if (server_credentials)
    {
      if (close (server_socket) == -1)
        {
          g_warning ("%s: failed to close server socket: %s\n", __FUNCTION__,
                     strerror (errno));
          return -1;
        }
      gnutls_deinit (server_session);
      gnutls_certificate_free_credentials (server_credentials);
    }
  else
    {
      gnutls_deinit (server_session);
      close (server_socket);
    }

  gnutls_global_deinit ();

  return 0;
}

Referenced by gvm_connection_free(), and gvm_server_close().

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gvm_server_new()

int gvm_server_new	(	unsigned int	end_type,
		gchar *	ca_cert_file,
		gchar *	cert_file,
		gchar *	key_file,
		gnutls_session_t *	server_session,
		gnutls_certificate_credentials_t *	server_credentials
	)

Make a session for connecting to a server.

Parameters

[in]	end_type	Connection end type (GNUTLS_SERVER or GNUTLS_CLIENT).
[in]	ca_cert_file	Certificate authority file.
[in]	cert_file	Certificate file.
[in]	key_file	Key file.
[out]	server_session	The session with the server.
[out]	server_credentials	Server credentials.

Returns

0 on success, -1 on error.

Definition at line 1155 of file serverutils.c.

{
  return server_new_internal (end_type, NULL, ca_cert_file, cert_file, key_file,
                              server_session, server_credentials);
}

References server_new_internal().

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gvm_server_new_mem()

int gvm_server_new_mem	(	unsigned int	end_type,
		const char *	ca_cert,
		const char *	pub_key,
		const char *	priv_key,
		gnutls_session_t *	session,
		gnutls_certificate_credentials_t *	credentials
	)

Make a session for connecting to a server, with certificates stored in memory.

Parameters

[in]	end_type	Connecton end type: GNUTLS_SERVER or GNUTLS_CLIENT.
[in]	ca_cert	Certificate authority public key.
[in]	pub_key	Public key.
[in]	priv_key	Private key.
[out]	session	The session with the server.
[out]	credentials	Server credentials.

Returns

0 on success, -1 on error.

Definition at line 1177 of file serverutils.c.

{
  if (server_new_gnutls_init (credentials))
    return -1;

  if (pub_key && priv_key)
    {
      int ret;
      gnutls_datum_t pub, priv;

      pub.data = (void *) pub_key;
      pub.size = strlen (pub_key);
      priv.data = (void *) priv_key;
      priv.size = strlen (priv_key);

      ret = gnutls_certificate_set_x509_key_mem (*credentials, &pub, &priv,
                                                 GNUTLS_X509_FMT_PEM);
      if (ret < 0)
        {
          g_warning ("%s: %s\n", __FUNCTION__, gnutls_strerror (ret));
          return -1;
        }
    }

  if (ca_cert)
    {
      int ret;
      gnutls_datum_t data;

      data.data = (void *) ca_cert;
      data.size = strlen (ca_cert);
      ret = gnutls_certificate_set_x509_trust_mem (*credentials, &data,
                                                   GNUTLS_X509_FMT_PEM);
      if (ret < 0)
        {
          g_warning ("%s: %s\n", __FUNCTION__, gnutls_strerror (ret));
          gnutls_certificate_free_credentials (*credentials);
          return -1;
        }
    }

  if (server_new_gnutls_set (end_type, NULL, session, credentials))
    {
      gnutls_certificate_free_credentials (*credentials);
      return -1;
    }

  return 0;
}

References server_new_gnutls_init(), and server_new_gnutls_set().

Referenced by gvm_server_open_verify().

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gvm_server_open()

int gvm_server_open	(	gnutls_session_t *	session,
		const char *	host,
		int	port
	)

Connect to the server using a given host and port.

Parameters

[in]	session	Pointer to GNUTLS session.
[in]	host	Host to connect to.
[in]	port	Port to connect to.

Returns

0 on success, -1 on error.

Definition at line 493 of file serverutils.c.

{
  return gvm_server_open_with_cert (session, host, port, NULL, NULL, NULL);
}

References gvm_server_open_with_cert().

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gvm_server_open_verify()

int gvm_server_open_verify	(	gnutls_session_t *	session,
		const char *	host,
		int	port,
		const char *	ca_mem,
		const char *	pub_mem,
		const char *	priv_mem,
		int	verify
	)

Connect to the server using a given host, port and cert.

Parameters

[in]	session	Pointer to GNUTLS session.
[in]	host	Host to connect to.
[in]	port	Port to connect to.
[in]	ca_mem	CA cert.
[in]	pub_mem	Public key.
[in]	priv_mem	Private key.
[in]	verify	Whether to verify.

Returns

0 on success, -1 on error.

Warning

On success we are leaking the credentials. We can't free them because the session only makes a shallow copy.

Definition at line 327 of file serverutils.c.

{
  int ret;
  int server_socket;
  struct addrinfo address_hints;
  struct addrinfo *addresses, *address;
  gchar *port_string;
  int host_type;

  gnutls_certificate_credentials_t credentials;

  /* Ensure that host and port have sane values. */
  if (port < 1 || port > 65535)
    {
      g_warning ("Failed to create client TLS session. "
                 "Invalid port %d",
                 port);
      return -1;
    }
  host_type = gvm_get_host_type (host);
  if (!(host_type == HOST_TYPE_NAME || host_type == HOST_TYPE_IPV4
        || host_type == HOST_TYPE_IPV6))
    {
      g_warning ("Failed to create client TLS session. Invalid host %s", host);
      return -1;
    }

  if (gvm_server_new_mem (GNUTLS_CLIENT, ca_mem, pub_mem, priv_mem, session,
                          &credentials))
    {
      g_warning ("Failed to create client TLS session.");
      return -1;
    }

  if (ca_mem && pub_mem && priv_mem)
    {
      set_cert_pub_mem (pub_mem);
      set_cert_priv_mem (priv_mem);

      gnutls_certificate_set_retrieve_function (credentials,
                                                client_cert_callback);
    }

  /* Create the port string. */

  port_string = g_strdup_printf ("%i", port);

  /* Get all possible addresses. */

  memset (&address_hints, 0, sizeof (address_hints));
  address_hints.ai_family = AF_UNSPEC; /* IPv4 or IPv6. */
  address_hints.ai_socktype = SOCK_STREAM;
  address_hints.ai_protocol = 0;

  if (getaddrinfo (host, port_string, &address_hints, &addresses))
    {
      g_free (port_string);
      g_warning ("Failed to get server addresses for %s: %s", host,
                 gai_strerror (errno));
      gnutls_deinit (*session);
      gnutls_certificate_free_credentials (credentials);
      return -1;
    }
  g_free (port_string);

  /* Try to connect to each address in turn. */

  for (address = addresses; address; address = address->ai_next)
    {
      /* Make server socket. */

      if (address->ai_family == AF_INET6)
        server_socket = socket (PF_INET6, SOCK_STREAM, 0);
      else
        server_socket = socket (PF_INET, SOCK_STREAM, 0);
      if (server_socket == -1)
        {
          g_warning ("Failed to create server socket");
          freeaddrinfo (addresses);
          gnutls_deinit (*session);
          gnutls_certificate_free_credentials (credentials);
          return -1;
        }

      /* Connect to server. */

      if (connect (server_socket, address->ai_addr, address->ai_addrlen) == -1)
        {
          close (server_socket);
          continue;
        }
      break;
    }

  freeaddrinfo (addresses);

  if (address == NULL)
    {
      g_warning ("Failed to connect to server");
      gnutls_deinit (*session);
      gnutls_certificate_free_credentials (credentials);
      return -1;
    }

  g_debug ("   Connected to server '%s' port %d.", host, port);

  /* Complete setup of server session. */
  ret = server_attach_internal (server_socket, session, host, port);
  if (ret)
    {
      if (ret == -2)
        {
          close (server_socket);
          gnutls_deinit (*session);
          gnutls_certificate_free_credentials (credentials);
        }
      close (server_socket);
      return -1;
    }
  if (verify && gvm_server_verify (*session))
    {
      close (server_socket);
      return -1;
    }

  return server_socket;
}

References address, client_cert_callback(), gvm_get_host_type(), gvm_server_new_mem(), gvm_server_verify(), HOST_TYPE_IPV4, HOST_TYPE_IPV6, HOST_TYPE_NAME, server_attach_internal(), set_cert_priv_mem(), and set_cert_pub_mem().

Referenced by gvm_server_open_with_cert().

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gvm_server_open_with_cert()

int gvm_server_open_with_cert	(	gnutls_session_t *	session,
		const char *	host,
		int	port,
		const char *	ca_mem,
		const char *	pub_mem,
		const char *	priv_mem
	)

Connect to the server using a given host, port and cert.

Verify if all cert args are given.

Parameters

[in]	session	Pointer to GNUTLS session.
[in]	host	Host to connect to.
[in]	port	Port to connect to.
[in]	ca_mem	CA cert.
[in]	pub_mem	Public key.
[in]	priv_mem	Private key.

Returns

0 on success, -1 on error.

Definition at line 475 of file serverutils.c.

{
  return gvm_server_open_verify (session, host, port, ca_mem, pub_mem, priv_mem,
                                 ca_mem && pub_mem && priv_mem);
}

References gvm_server_open_verify().

Referenced by gvm_server_open(), and osp_send_command().

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gvm_server_sendf()

int gvm_server_sendf	(	gnutls_session_t *	session,
		const char *	format,
			...
	)

Format and send a string to the server.

Parameters

[in]	session	Pointer to GNUTLS session.
[in]	format	printf-style format string for message.

Returns

0 on success, -1 on error.

Definition at line 819 of file serverutils.c.

{
  va_list ap;
  int rc;

  va_start (ap, format);
  rc = gvm_server_vsendf (session, format, ap);
  va_end (ap);
  return rc;
}

References gvm_server_vsendf().

Referenced by gmp_create_lsc_credential_ext(), gmp_create_target_ext(), gmp_create_task_ext(), gmp_delete_config_ext(), gmp_delete_lsc_credential_ext(), gmp_delete_port_list_ext(), gmp_delete_report(), gmp_delete_target_ext(), gmp_delete_task(), gmp_delete_task_ext(), gmp_get_report_ext(), gmp_get_system_reports(), gmp_get_system_reports_ext(), gmp_get_targets(), gmp_get_task_ext(), gmp_get_tasks(), gmp_get_tasks_ext(), gmp_modify_task_file(), gmp_ping(), gmp_resume_task_report(), gmp_start_task_report(), gmp_stop_task(), and gvm_server_sendf_xml().

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gvm_server_sendf_quiet()

int gvm_server_sendf_quiet	(	gnutls_session_t *	session,
		const char *	format,
			...
	)

Format and send a string to the server.

Parameters

[in]	session	Pointer to GNUTLS session.
[in]	format	printf-style format string for message.

Returns

0 on success, -1 on error.

Definition at line 859 of file serverutils.c.

{
  va_list ap;
  int rc;

  va_start (ap, format);
  rc = gvm_server_vsendf_quiet (session, format, ap);
  va_end (ap);
  return rc;
}

References gvm_server_vsendf_quiet().

Referenced by gvm_server_sendf_xml_quiet().

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gvm_server_sendf_xml()

int gvm_server_sendf_xml	(	gnutls_session_t *	session,
		const char *	format,
			...
	)

Format and send an XML string to the server.

Escape XML in string and character args.

Parameters

[in]	session	Pointer to GNUTLS session.
[in]	format	printf-style format string for message.

Returns

0 on success, -1 on error.

Definition at line 902 of file serverutils.c.

{
  va_list ap;
  gchar *msg;
  int rc;

  va_start (ap, format);
  msg = g_markup_vprintf_escaped (format, ap);
  rc = gvm_server_sendf (session, "%s", msg);
  g_free (msg);
  va_end (ap);
  return rc;
}

References gvm_server_sendf().

Referenced by gmp_create_lsc_credential(), gmp_create_lsc_credential_key(), and gmp_create_task().

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gvm_server_sendf_xml_quiet()

int gvm_server_sendf_xml_quiet	(	gnutls_session_t *	session,
		const char *	format,
			...
	)

Format and send an XML string to the server.

Escape XML in string and character args.

Quiet version, only logs warnings.

Parameters

[in]	session	Pointer to GNUTLS session.
[in]	format	printf-style format string for message.

Returns

0 on success, -1 on error.

Definition at line 954 of file serverutils.c.

{
  va_list ap;
  gchar *msg;
  int rc;

  va_start (ap, format);
  msg = g_markup_vprintf_escaped (format, ap);
  rc = gvm_server_sendf_quiet (session, "%s", msg);
  g_free (msg);
  va_end (ap);
  return rc;
}

References gvm_server_sendf_quiet().

Referenced by gmp_authenticate(), gmp_authenticate_info_ext(), and gmp_create_lsc_credential().

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gvm_server_verify()

int gvm_server_verify

(

gnutls_session_t

session

)

Verify certificate.

Parameters

[in]

session

Pointer to GNUTLS session.

Returns

0 on success, 1 on failure, -1 on error.

Definition at line 130 of file serverutils.c.

{
  unsigned int status;
  int ret;

  ret = gnutls_certificate_verify_peers2 (session, &status);
  if (ret < 0)
    {
      g_warning ("%s: failed to verify peers: %s", __FUNCTION__,
                 gnutls_strerror (ret));
      return -1;
    }

  if (status & GNUTLS_CERT_INVALID)
    g_warning ("%s: the certificate is not trusted", __FUNCTION__);

  if (status & GNUTLS_CERT_SIGNER_NOT_CA)
    g_warning ("%s: the certificate's issuer is not a CA", __FUNCTION__);

  if (status & GNUTLS_CERT_INSECURE_ALGORITHM)
    g_warning ("%s: the certificate was signed using an insecure algorithm",
               __FUNCTION__);

  if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
    g_warning ("%s: the certificate hasn't got a known issuer", __FUNCTION__);

  if (status & GNUTLS_CERT_REVOKED)
    g_warning ("%s: the certificate has been revoked", __FUNCTION__);

  if (status & GNUTLS_CERT_EXPIRED)
    g_warning ("%s: the certificate has expired", __FUNCTION__);

  if (status & GNUTLS_CERT_NOT_ACTIVATED)
    g_warning ("%s: the certificate is not yet activated", __FUNCTION__);

  if (status)
    return 1;

  return 0;
}

Referenced by gvm_server_open_verify().

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gvm_server_vsendf()

int gvm_server_vsendf	(	gnutls_session_t *	session,
		const char *	fmt,
		va_list	ap
	)

Send a string to the server.

Parameters

[in]	session	Pointer to GNUTLS session.
[in]	fmt	Format of string to send.
[in]	ap	Args for fmt.

Returns

0 on success, 1 if server closed connection, -1 on error.

Definition at line 743 of file serverutils.c.

{
  return gvm_server_vsendf_internal (session, fmt, ap, 0);
}

References gvm_server_vsendf_internal().

Referenced by gvm_server_sendf().

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gvm_server_vsendf_internal()

static int gvm_server_vsendf_internal ( gnutls_session_t *  session, const char *  fmt, va_list  ap, int  quiet  )

static

Send a string to the server.

Parameters

[in]	session	Pointer to GNUTLS session.
[in]	fmt	Format of string to send.
[in]	ap	Args for fmt.
[in]	quiet	Whether to log debug and info messages. Useful for hiding passwords.

Returns

0 on success, 1 if server closed connection, -1 on error.

Definition at line 605 of file serverutils.c.

{
  char *sref, *string;
  int rc = 0, left;

  left = vasprintf (&string, fmt, ap);
  if (left == -1)
    string = NULL;

  sref = string;
  while (left > 0)
    {
      ssize_t count;

      if (quiet == 0)
        g_debug ("   send %d from %.*s[...]", left, left < 30 ? left : 30,
                 string);
      count = gnutls_record_send (*session, string, left);
      if (count < 0)
        {
          if (count == GNUTLS_E_INTERRUPTED)
            /* Interrupted, try write again. */
            continue;
          if (count == GNUTLS_E_REHANDSHAKE)
            {
              /* \todo Rehandshake. */
              if (quiet == 0)
                g_message ("   %s rehandshake", __FUNCTION__);
              continue;
            }
          g_warning ("Failed to write to server: %s", gnutls_strerror (count));
          rc = -1;
          goto out;
        }
      if (count == 0)
        {
          /* Server closed connection. */
          if (quiet == 0)
            g_debug ("=  server closed");
          rc = 1;
          goto out;
        }
      if (quiet == 0)
        g_debug ("=> %.*s", (int) count, string);
      string += count;
      left -= count;
    }
  if (quiet == 0)
    g_debug ("=> done");

out:
  g_free (sref);
  return rc;
}

Referenced by gvm_connection_vsendf_internal(), gvm_server_vsendf(), and gvm_server_vsendf_quiet().

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gvm_server_vsendf_quiet()

int gvm_server_vsendf_quiet	(	gnutls_session_t *	session,
		const char *	fmt,
		va_list	ap
	)

Send a string to the server, refraining from logging besides warnings.

Parameters

[in]	session	Pointer to GNUTLS session.
[in]	fmt	Format of string to send.
[in]	ap	Args for fmt.

Returns

0 on success, 1 if server closed connection, -1 on error.

Definition at line 789 of file serverutils.c.

{
  return gvm_server_vsendf_internal (session, fmt, ap, 1);
}

References gvm_server_vsendf_internal().

Referenced by gvm_server_sendf_quiet().

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gvm_socket_vsendf()

int gvm_socket_vsendf	(	int	socket,
		const char *	fmt,
		va_list	ap
	)

Send a string to the server.

Parameters

[in]	socket	Socket to send string through.
[in]	fmt	Format of string to send.
[in]	ap	Args for fmt.

Returns

0 on success, 1 if server closed connection, -1 on error.

Definition at line 758 of file serverutils.c.

{
  return unix_vsendf_internal (socket, fmt, ap, 0);
}

References unix_vsendf_internal().

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load_gnutls_file()

int load_gnutls_file	(	const char *	file,
		gnutls_datum_t *	loaded_file
	)

Loads a file's data into gnutls_datum_t struct.

Parameters

[in]	file	File to load.
[out]	loaded_file	Destination to load file into.

Returns

0 if success, -1 if error.

Definition at line 180 of file serverutils.c.

{
  FILE *f = NULL;
  int64_t filelen;
  void *ptr;

  if (!(f = fopen (file, "r")) || fseek (f, 0, SEEK_END) != 0
      || (filelen = ftell (f)) < 0 || fseek (f, 0, SEEK_SET) != 0
      || !(ptr = g_malloc0 ((size_t) filelen))
      || fread (ptr, 1, (size_t) filelen, f) < (size_t) filelen)
    {
      if (f)
        fclose (f);
      return -1;
    }

  loaded_file->data = ptr;
  loaded_file->size = filelen;
  fclose (f);
  return 0;
}

Referenced by set_gnutls_dhparams().

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server_attach_internal()

static int server_attach_internal ( int  socket, gnutls_session_t *  session, const char *  host, int  port  )

static

Attach a socket to a session, and shake hands with the peer.

Parameters

[in]	socket	Socket.
[in]	session	Pointer to GNUTLS session.
[in]	host	NULL or the name of the host for diagnostics
[in]	port	Port number for diagnostics; only used if host is not NULL

Returns

0 on success, -1 on general error, -2 if the TLS handshake failed.

Definition at line 537 of file serverutils.c.

{
  unsigned int retries;

  gnutls_transport_set_ptr (*session,
                            (gnutls_transport_ptr_t) GSIZE_TO_POINTER (socket));

  retries = 0;
  while (1)
    {
      int ret = gnutls_handshake (*session);
      if (ret >= 0)
        break;
      if (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED)
        {
          if (retries > 10)
            usleep (MIN ((retries - 10) * 10000, 5000000));
          retries++;
          continue;
        }
      if (host)
        g_debug ("Failed to shake hands with server '%s' port %d: %s", host,
                 port, gnutls_strerror (ret));
      else
        g_debug ("Failed to shake hands with peer: %s", gnutls_strerror (ret));
      if (shutdown (socket, SHUT_RDWR) == -1)
        g_debug ("Failed to shutdown server socket");
      return -2;
    }
  if (host)
    g_debug ("   Shook hands with server '%s' port %d.", host, port);
  else
    g_debug ("   Shook hands with peer.");

  return 0;
}

Referenced by gvm_server_attach(), and gvm_server_open_verify().

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server_new_gnutls_init()

static int server_new_gnutls_init ( gnutls_certificate_credentials_t *  server_credentials )

static

Initialize a server session.

Parameters

[in]

server_credentials

Credentials to be allocated.

Returns

0 on success, -1 on error.

Definition at line 1002 of file serverutils.c.

{
  /* Turn off use of /dev/random, as this can block. */
  gcry_control (GCRYCTL_ENABLE_QUICK_RANDOM, 0);

  /* Initialize security library. */
  if (gnutls_global_init ())
    {
      g_warning ("Failed to initialize GNUTLS.");
      return -1;
    }
  /* Setup server session. */
  if (gnutls_certificate_allocate_credentials (server_credentials))
    {
      g_warning ("%s: failed to allocate server credentials\n", __FUNCTION__);
      return -1;
    }
  return 0;
}

Referenced by gvm_server_new_mem(), and server_new_internal().

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server_new_gnutls_set()

static int server_new_gnutls_set ( unsigned int  end_type, const char *  priority, gnutls_session_t *  server_session, gnutls_certificate_credentials_t *  server_credentials  )

static

Set the server credencials.

Parameters

[in]	end_type	Connection end type.
[in]	priority	TLS priority to be set. If no one is given, NORMAL is default.
[in]	server_session	GNUTLS session.
[in]	server_credentials	Credentials to be set.

Returns

0 on success, -1 on error.

Definition at line 1032 of file serverutils.c.

{
  int err_gnutls;

  if (gnutls_init (server_session, end_type))
    {
      g_warning ("%s: failed to initialise server session\n", __FUNCTION__);
      return -1;
    }

  /* Depending on gnutls version different priority strings are
     possible. At least from 3.0 this is an option:
     "NONE:+VERS-TLS1.0:+CIPHER-ALL:+COMP-ALL:+RSA:+DHE-RSA:+DHE-DSS:+MAC-ALL"
     But in fact this function is only for internal
     purposes, not for scanning abilities. So, the conservative "NORMAL"
     is chosen.
  */

  if ((err_gnutls = gnutls_priority_set_direct (
         *server_session, priority ? priority : "NORMAL", NULL)))
    {
      g_warning ("%s: failed to set tls priorities: %s\n", __FUNCTION__,
                 gnutls_strerror (err_gnutls));
      gnutls_deinit (*server_session);
      return -1;
    }

  if (gnutls_credentials_set (*server_session, GNUTLS_CRD_CERTIFICATE,
                              *server_credentials))
    {
      g_warning ("%s: failed to set server credentials\n", __FUNCTION__);
      gnutls_deinit (*server_session);
      return -1;
    }

  if (end_type == GNUTLS_SERVER)
    gnutls_certificate_server_set_request (*server_session,
                                           GNUTLS_CERT_REQUEST);
  return 0;
}

Referenced by gvm_server_new_mem(), and server_new_internal().

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server_new_internal()

static int server_new_internal ( unsigned int  end_type, const char *  priority, const gchar *  ca_cert_file, const gchar *  cert_file, const gchar *  key_file, gnutls_session_t *  server_session, gnutls_certificate_credentials_t *  server_credentials  )

static

Make a session for connecting to a server.

Parameters

[in]	end_type	Connection end type (GNUTLS_SERVER or GNUTLS_CLIENT).
[in]	priority	Custom priority string or NULL.
[in]	ca_cert_file	Certificate authority file.
[in]	cert_file	Certificate file.
[in]	key_file	Key file.
[out]	server_session	The session with the server.
[out]	server_credentials	Server credentials.

Returns

0 on success, -1 on error.

Definition at line 1090 of file serverutils.c.

{
  if (server_new_gnutls_init (server_credentials))
    return -1;

  if (cert_file && key_file)
    {
      int ret;

      ret = gnutls_certificate_set_x509_key_file (
        *server_credentials, cert_file, key_file, GNUTLS_X509_FMT_PEM);
      if (ret < 0)
        {
          g_warning ("%s: failed to set credentials key file: %s\n",
                     __FUNCTION__, gnutls_strerror (ret));
          g_warning ("%s:   cert file: %s\n", __FUNCTION__, cert_file);
          g_warning ("%s:   key file : %s\n", __FUNCTION__, key_file);
          gnutls_certificate_free_credentials (*server_credentials);
          return -1;
        }
    }

  if (ca_cert_file)
    {
      int ret;

      ret = gnutls_certificate_set_x509_trust_file (
        *server_credentials, ca_cert_file, GNUTLS_X509_FMT_PEM);
      if (ret < 0)
        {
          g_warning ("%s: failed to set credentials trust file: %s\n",
                     __FUNCTION__, gnutls_strerror (ret));
          g_warning ("%s: trust file: %s\n", __FUNCTION__, ca_cert_file);
          gnutls_certificate_free_credentials (*server_credentials);
          return -1;
        }
    }

  if (server_new_gnutls_set (end_type, priority, server_session,
                             server_credentials))
    {
      gnutls_certificate_free_credentials (*server_credentials);
      return -1;
    }

  return 0;
}

References server_new_gnutls_init(), and server_new_gnutls_set().

Referenced by gvm_server_new().

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set_cert_priv_mem()

static void set_cert_priv_mem ( const char *  data )

static

Save cert_priv_mem with private certificate.

Parameters

[in]

data

The DER or PEM encoded certificate.

Definition at line 234 of file serverutils.c.

{
  if (cert_priv_mem)
    g_free (cert_priv_mem);
  cert_priv_mem = g_strdup (data);
}

References cert_priv_mem.

Referenced by gvm_server_open_verify().

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set_cert_pub_mem()

static void set_cert_pub_mem ( const char *  data )

static

Save cert_pub_mem with public certificate.

Parameters

[in]

data

The DER or PEM encoded certificate.

Definition at line 222 of file serverutils.c.

{
  if (cert_pub_mem)
    g_free (cert_pub_mem);
  cert_pub_mem = g_strdup (data);
}

References cert_pub_mem.

Referenced by gvm_server_open_verify().

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set_gnutls_dhparams()

int set_gnutls_dhparams	(	gnutls_certificate_credentials_t	creds,
		const char *	dhparams_file
	)

Set a gnutls session's Diffie-Hellman parameters.

Parameters

[in]	creds	GnuTLS credentials.
[in]	dhparams_file	Path to PEM file containing the DH parameters.

Returns

0 on success, -1 on error.

Definition at line 1239 of file serverutils.c.

{
  int ret;
  gnutls_datum_t data;

  if (!creds || !dhparams_file)
    return -1;

  if (load_gnutls_file (dhparams_file, &data))
    return -1;
  gnutls_dh_params_t params = g_malloc0 (sizeof (gnutls_dh_params_t));
  ret = gnutls_dh_params_import_pkcs3 (params, &data, GNUTLS_X509_FMT_PEM);
  unload_gnutls_file (&data);
  if (ret)
    return -1;
  else
    gnutls_certificate_set_dh_params (creds, params);
  return 0;
}

References load_gnutls_file(), and unload_gnutls_file().

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unix_vsendf_internal()

static int unix_vsendf_internal ( int  socket, const char *  fmt, va_list  ap, int  quiet  )

static

Send a string to the server.

Parameters

[in]	socket	Socket.
[in]	fmt	Format of string to send.
[in]	ap	Args for fmt.
[in]	quiet	Whether to log debug and info messages. Useful for hiding passwords.

Returns

0 on success, 1 if server closed connection, -1 on error.

Definition at line 673 of file serverutils.c.

{
  char *string_start, *string;
  int rc = 0, left;

  left = vasprintf (&string, fmt, ap);
  if (left == -1)
    string = NULL;

  string_start = string;
  while (left > 0)
    {
      ssize_t count;

      if (quiet == 0)
        g_debug ("   send %d from %.*s[...]", left, left < 30 ? left : 30,
                 string);
      count = write (socket, string, left);
      if (count < 0)
        {
          if (errno == EINTR || errno == EAGAIN)
            continue;
          g_warning ("Failed to write to server: %s", strerror (errno));
          rc = -1;
          goto out;
        }
      if (quiet == 0)
        g_debug ("=> %.*s", (int) count, string);

      string += count;
      left -= count;
    }
  if (quiet == 0)
    g_debug ("=> done");

out:
  g_free (string_start);
  return rc;
}

Referenced by gvm_connection_vsendf_internal(), and gvm_socket_vsendf().

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unload_gnutls_file()

void unload_gnutls_file

(

gnutls_datum_t *

data

)

Unloads a gnutls_datum_t struct's data.

Parameters

[in]

data

Pointer to gnutls_datum_t struct to be unloaded.

Definition at line 208 of file serverutils.c.

{
  if (data)
    g_free (data->data);
}

Referenced by set_gnutls_dhparams().

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Variable Documentation

address

struct sockaddr_in address

Server address.

Definition at line 57 of file serverutils.c.

Referenced by gvm_server_open_verify().

cert_priv_mem

char* cert_priv_mem = NULL

static

Definition at line 215 of file serverutils.c.

Referenced by get_cert_priv_mem(), and set_cert_priv_mem().

cert_pub_mem

char* cert_pub_mem = NULL

static

Definition at line 214 of file serverutils.c.

Referenced by get_cert_pub_mem(), and set_cert_pub_mem().