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/*-------------------------------------------------------------------------
*
* be-secure.c
* functions related to setting up a secure connection to the frontend.
* Secure connections are expected to provide confidentiality,
* message integrity and endpoint authentication.
*
*
* Portions Copyright (c) 1996-2014, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/libpq/be-secure.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <sys/stat.h>
#include <signal.h>
#include <fcntl.h>
#include <ctype.h>
#include <sys/socket.h>
#include <unistd.h>
#include <netdb.h>
#include <netinet/in.h>
#ifdef HAVE_NETINET_TCP_H
#include <netinet/tcp.h>
#include <arpa/inet.h>
#endif
#include "libpq/libpq.h"
#include "tcop/tcopprot.h"
#include "utils/memutils.h"
char *ssl_cert_file;
char *ssl_key_file;
char *ssl_ca_file;
char *ssl_crl_file;
/*
* How much data can be sent across a secure connection
* (total in both directions) before we require renegotiation.
* Set to 0 to disable renegotiation completely.
*/
int ssl_renegotiation_limit;
#ifdef USE_SSL
bool ssl_loaded_verify_locations = false;
#endif
/* GUC variable controlling SSL cipher list */
char *SSLCipherSuites = NULL;
/* GUC variable for default ECHD curve. */
char *SSLECDHCurve;
/* GUC variable: if false, prefer client ciphers */
bool SSLPreferServerCiphers;
/* ------------------------------------------------------------ */
/* Procedures common to all secure sessions */
/* ------------------------------------------------------------ */
/*
* Initialize global context
*/
int
secure_initialize(void)
{
#ifdef USE_SSL
be_tls_init();
#endif
return 0;
}
/*
* Indicate if we have loaded the root CA store to verify certificates
*/
bool
secure_loaded_verify_locations(void)
{
#ifdef USE_SSL
return ssl_loaded_verify_locations;
#else
return false;
#endif
}
/*
* Attempt to negotiate secure session.
*/
int
secure_open_server(Port *port)
{
int r = 0;
#ifdef USE_SSL
r = be_tls_open_server(port);
#endif
return r;
}
/*
* Close secure session.
*/
void
secure_close(Port *port)
{
#ifdef USE_SSL
if (port->ssl_in_use)
be_tls_close(port);
#endif
}
/*
* Read data from a secure connection.
*/
ssize_t
secure_read(Port *port, void *ptr, size_t len)
{
ssize_t n;
#ifdef USE_SSL
if (port->ssl_in_use)
{
n = be_tls_read(port, ptr, len);
}
else
#endif
{
n = secure_raw_read(port, ptr, len);
}
return n;
}
ssize_t
secure_raw_read(Port *port, void *ptr, size_t len)
{
ssize_t n;
prepare_for_client_read();
n = recv(port->sock, ptr, len, 0);
client_read_ended();
return n;
}
/*
* Write data to a secure connection.
*/
ssize_t
secure_write(Port *port, void *ptr, size_t len)
{
ssize_t n;
#ifdef USE_SSL
if (port->ssl_in_use)
{
n = be_tls_write(port, ptr, len);
}
else
#endif
n = secure_raw_write(port, ptr, len);
return n;
}
ssize_t
secure_raw_write(Port *port, const void *ptr, size_t len)
{
return send(port->sock, ptr, len, 0);
}
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