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|
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
* Authors: Jeffrey Stedfast <fejj@ximian.com>
*
* Copyright 2001 Ximian, Inc. (www.ximian.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
*/
/* NOTE: This is the default implementation of CamelTcpStreamSSL,
* used when the Mozilla NSS libraries are used. If you configured
* OpenSSL support instead, then this file won't be compiled and
* the CamelTcpStreamSSL implementation in camel-tcp-stream-openssl.c
* will be used instead.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_NSS
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <nspr.h>
#include <prio.h>
#include <prerror.h>
#include <prerr.h>
#include "nss.h" /* Don't use <> here or it will include the system nss.h instead */
#include <ssl.h>
#include <cert.h>
#include <certdb.h>
#include <pk11func.h>
/* this is commented because otherwise we get an error about the
redefinition of MD5Context...yay */
/*#include <e-util/md5-utils.h>*/
#include "camel-tcp-stream-ssl.h"
#include "camel-session.h"
static CamelTcpStreamClass *parent_class = NULL;
/* Returns the class for a CamelTcpStreamSSL */
#define CTSS_CLASS(so) CAMEL_TCP_STREAM_SSL_CLASS (CAMEL_OBJECT_GET_CLASS (so))
static ssize_t stream_read (CamelStream *stream, char *buffer, size_t n);
static ssize_t stream_write (CamelStream *stream, const char *buffer, size_t n);
static int stream_flush (CamelStream *stream);
static int stream_close (CamelStream *stream);
static PRFileDesc *enable_ssl (CamelTcpStreamSSL *ssl, PRFileDesc *fd);
static int stream_connect (CamelTcpStream *stream, struct hostent *host, int port);
static int stream_getsockopt (CamelTcpStream *stream, CamelSockOptData *data);
static int stream_setsockopt (CamelTcpStream *stream, const CamelSockOptData *data);
static CamelTcpAddress *stream_get_local_address (CamelTcpStream *stream);
static CamelTcpAddress *stream_get_remote_address (CamelTcpStream *stream);
struct _CamelTcpStreamSSLPrivate {
PRFileDesc *sockfd;
CamelService *service;
char *expected_host;
gboolean ssl_mode;
};
static void
camel_tcp_stream_ssl_class_init (CamelTcpStreamSSLClass *camel_tcp_stream_ssl_class)
{
CamelTcpStreamClass *camel_tcp_stream_class =
CAMEL_TCP_STREAM_CLASS (camel_tcp_stream_ssl_class);
CamelStreamClass *camel_stream_class =
CAMEL_STREAM_CLASS (camel_tcp_stream_ssl_class);
parent_class = CAMEL_TCP_STREAM_CLASS (camel_type_get_global_classfuncs (camel_tcp_stream_get_type ()));
/* virtual method overload */
camel_stream_class->read = stream_read;
camel_stream_class->write = stream_write;
camel_stream_class->flush = stream_flush;
camel_stream_class->close = stream_close;
camel_tcp_stream_class->connect = stream_connect;
camel_tcp_stream_class->getsockopt = stream_getsockopt;
camel_tcp_stream_class->setsockopt = stream_setsockopt;
camel_tcp_stream_class->get_local_address = stream_get_local_address;
camel_tcp_stream_class->get_remote_address = stream_get_remote_address;
}
static void
camel_tcp_stream_ssl_init (gpointer object, gpointer klass)
{
CamelTcpStreamSSL *stream = CAMEL_TCP_STREAM_SSL (object);
stream->priv = g_new0 (struct _CamelTcpStreamSSLPrivate, 1);
}
static void
camel_tcp_stream_ssl_finalize (CamelObject *object)
{
CamelTcpStreamSSL *stream = CAMEL_TCP_STREAM_SSL (object);
if (stream->priv->sockfd != NULL)
PR_Close (stream->priv->sockfd);
g_free (stream->priv->expected_host);
g_free (stream->priv);
}
CamelType
camel_tcp_stream_ssl_get_type (void)
{
static CamelType type = CAMEL_INVALID_TYPE;
if (type == CAMEL_INVALID_TYPE) {
type = camel_type_register (camel_tcp_stream_get_type (),
"CamelTcpStreamSSL",
sizeof (CamelTcpStreamSSL),
sizeof (CamelTcpStreamSSLClass),
(CamelObjectClassInitFunc) camel_tcp_stream_ssl_class_init,
NULL,
(CamelObjectInitFunc) camel_tcp_stream_ssl_init,
(CamelObjectFinalizeFunc) camel_tcp_stream_ssl_finalize);
}
return type;
}
/**
* camel_tcp_stream_ssl_new:
* @service: camel service
* @expected_host: host that the stream is expected to connect with.
*
* Since the SSL certificate authenticator may need to prompt the
* user, a CamelService is needed. @expected_host is needed as a
* protection against an MITM attack.
*
* Return value: a ssl stream (in ssl mode)
**/
CamelStream *
camel_tcp_stream_ssl_new (CamelService *service, const char *expected_host)
{
CamelTcpStreamSSL *stream;
stream = CAMEL_TCP_STREAM_SSL (camel_object_new (camel_tcp_stream_ssl_get_type ()));
stream->priv->service = service;
stream->priv->expected_host = g_strdup (expected_host);
stream->priv->ssl_mode = TRUE;
return CAMEL_STREAM (stream);
}
/**
* camel_tcp_stream_ssl_new_raw:
* @service: camel service
* @expected_host: host that the stream is expected to connect with.
*
* Since the SSL certificate authenticator may need to prompt the
* user, a CamelService is needed. @expected_host is needed as a
* protection against an MITM attack.
*
* Return value: a ssl-capable stream (in non ssl mode)
**/
CamelStream *
camel_tcp_stream_ssl_new_raw (CamelService *service, const char *expected_host)
{
CamelTcpStreamSSL *stream;
stream = CAMEL_TCP_STREAM_SSL (camel_object_new (camel_tcp_stream_ssl_get_type ()));
stream->priv->service = service;
stream->priv->expected_host = g_strdup (expected_host);
stream->priv->ssl_mode = FALSE;
return CAMEL_STREAM (stream);
}
static void
set_errno (int code)
{
/* FIXME: this should handle more. */
switch (code) {
case PR_INVALID_ARGUMENT_ERROR:
errno = EINVAL;
break;
case PR_PENDING_INTERRUPT_ERROR:
errno = EINTR;
break;
case PR_IO_PENDING_ERROR:
case PR_IO_TIMEOUT_ERROR:
errno = EAGAIN;
break;
case PR_WOULD_BLOCK_ERROR:
errno = EWOULDBLOCK;
break;
case PR_IN_PROGRESS_ERROR:
errno = EINPROGRESS;
break;
case PR_ALREADY_INITIATED_ERROR:
errno = EALREADY;
break;
case PR_NETWORK_UNREACHABLE_ERROR:
errno = EHOSTUNREACH;
break;
case PR_CONNECT_REFUSED_ERROR:
errno = ECONNREFUSED;
break;
case PR_CONNECT_TIMEOUT_ERROR:
errno = ETIMEDOUT;
break;
case PR_NOT_CONNECTED_ERROR:
errno = ENOTCONN;
break;
case PR_CONNECT_RESET_ERROR:
errno = ECONNRESET;
break;
case PR_IO_ERROR:
default:
errno = EIO;
break;
}
}
/**
* camel_tcp_stream_ssl_enable_ssl:
* @ssl: ssl stream
*
* Toggles an ssl-capable stream into ssl mode (if it isn't already).
*
* Returns 0 on success or -1 on fail.
**/
int
camel_tcp_stream_ssl_enable_ssl (CamelTcpStreamSSL *ssl)
{
PRFileDesc *fd;
g_return_val_if_fail (CAMEL_IS_TCP_STREAM_SSL (ssl), -1);
if (ssl->priv->sockfd && !ssl->priv->ssl_mode) {
fd = enable_ssl (ssl, NULL);
if (fd == NULL) {
int errnosave;
set_errno (PR_GetError ());
errnosave = errno;
errno = errnosave;
return -1;
}
SSL_ResetHandshake (fd, FALSE);
ssl->priv->sockfd = fd;
}
ssl->priv->ssl_mode = TRUE;
return 0;
}
static ssize_t
stream_read (CamelStream *stream, char *buffer, size_t n)
{
CamelTcpStreamSSL *tcp_stream_ssl = CAMEL_TCP_STREAM_SSL (stream);
ssize_t nread;
do {
if (camel_operation_cancel_check (NULL)) {
errno = EINTR;
return -1;
}
nread = PR_Read (tcp_stream_ssl->priv->sockfd, buffer, n);
if (nread == -1)
set_errno (PR_GetError ());
} while (nread == -1 && (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK));
return nread;
}
static ssize_t
stream_write (CamelStream *stream, const char *buffer, size_t n)
{
CamelTcpStreamSSL *tcp_stream_ssl = CAMEL_TCP_STREAM_SSL (stream);
ssize_t w, written = 0;
do {
if (camel_operation_cancel_check (NULL)) {
errno = EINTR;
return -1;
}
do {
w = PR_Write (tcp_stream_ssl->priv->sockfd, buffer + written, n - written);
if (w == -1)
set_errno (PR_GetError ());
} while (w == -1 && (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK));
if (w > 0)
written += w;
} while (w != -1 && written < n);
return written;
}
static int
stream_flush (CamelStream *stream)
{
return PR_Sync (((CamelTcpStreamSSL *)stream)->priv->sockfd);
}
static int
stream_close (CamelStream *stream)
{
if (PR_Close (((CamelTcpStreamSSL *)stream)->priv->sockfd) == PR_FAILURE)
return -1;
((CamelTcpStreamSSL *)stream)->priv->sockfd = NULL;
return 0;
}
#if 0
/* Since this is default implementation, let NSS handle it. */
static SECStatus
ssl_get_client_auth (void *data, PRFileDesc *sockfd,
struct CERTDistNamesStr *caNames,
struct CERTCertificateStr **pRetCert,
struct SECKEYPrivateKeyStr **pRetKey)
{
SECStatus status = SECFailure;
SECKEYPrivateKey *privkey;
CERTCertificate *cert;
void *proto_win;
proto_win = SSL_RevealPinArg (sockfd);
if ((char *) data) {
cert = PK11_FindCertFromNickname ((char *) data, proto_win);
if (cert) {
privKey = PK11_FindKeyByAnyCert (cert, proto_win);
if (privkey) {
status = SECSuccess;
} else {
CERT_DestroyCertificate (cert);
}
}
} else {
/* no nickname given, automatically find the right cert */
CERTCertNicknames *names;
int i;
names = CERT_GetCertNicknames (CERT_GetDefaultCertDB (),
SEC_CERT_NICKNAMES_USER,
proto_win);
if (names != NULL) {
for (i = 0; i < names->numnicknames; i++) {
cert = PK11_FindCertFromNickname (names->nicknames[i],
proto_win);
if (!cert)
continue;
/* Only check unexpired certs */
if (CERT_CheckCertValidTimes (cert, PR_Now (), PR_FALSE) != secCertTimeValid) {
CERT_DestroyCertificate (cert);
continue;
}
status = NSS_CmpCertChainWCANames (cert, caNames);
if (status == SECSuccess) {
privkey = PK11_FindKeyByAnyCert (cert, proto_win);
if (privkey)
break;
status = SECFailure;
break;
}
CERT_FreeNicknames (names);
}
}
}
if (status == SECSuccess) {
*pRetCert = cert;
*pRetKey = privkey;
}
return status;
}
#endif
#if 0
/* Since this is the default NSS implementation, no need for us to use this. */
static SECStatus
ssl_auth_cert (void *data, PRFileDesc *sockfd, PRBool checksig, PRBool is_server)
{
CERTCertificate *cert;
SECStatus status;
void *pinarg;
char *host;
cert = SSL_PeerCertificate (sockfd);
pinarg = SSL_RevealPinArg (sockfd);
status = CERT_VerifyCertNow ((CERTCertDBHandle *)data, cert,
checksig, certUsageSSLClient, pinarg);
if (status != SECSuccess)
return SECFailure;
/* Certificate is OK. Since this is the client side of an SSL
* connection, we need to verify that the name field in the cert
* matches the desired hostname. This is our defense against
* man-in-the-middle attacks.
*/
/* SSL_RevealURL returns a hostname, not a URL. */
host = SSL_RevealURL (sockfd);
if (host && *host) {
status = CERT_VerifyCertName (cert, host);
} else {
PR_SetError (SSL_ERROR_BAD_CERT_DOMAIN, 0);
status = SECFailure;
}
if (host)
PR_Free (host);
return secStatus;
}
#endif
static SECStatus
ssl_bad_cert (void *data, PRFileDesc *sockfd)
{
unsigned char md5sum[16], fingerprint[40], *f;
gboolean accept, valid_cert;
char *prompt, *cert_str;
CamelTcpStreamSSL *ssl;
CERTCertificate *cert;
CamelService *service;
int i;
g_return_val_if_fail (data != NULL, SECFailure);
g_return_val_if_fail (CAMEL_IS_TCP_STREAM_SSL (data), SECFailure);
ssl = CAMEL_TCP_STREAM_SSL (data);
service = ssl->priv->service;
cert = SSL_PeerCertificate (sockfd);
/* calculate the MD5 hash of the raw certificate */
md5_get_digest (cert->derCert.data, cert->derCert.len, md5sum);
/*HASH_HashBuf (HASH_AlgMD5, md5sum, cert->derCert.data, cert->derCert.len);*/
for (i = 0, f = fingerprint; i < 16; i++, f += 3)
sprintf (f, "%.2x%c", md5sum[i], i != 15 ? ':' : '\0');
valid_cert = CERT_VerifyCertNow (CERT_GetDefaultCertDB (), cert, TRUE, certUsageSSLClient, NULL);
/*issuer = CERT_FindCertByName (CERT_GetDefaultCertDB (), &cert->derIssuer);
valid_cert = issuer && CERT_VerifySignedData (&cert->signatureWrap, issuer, PR_Now (), NULL);*/
cert_str = g_strdup_printf (_("Issuer: %s\n"
"Subject: %s\n"
"Fingerprint: %s\n"
"Signature: %s"),
CERT_NameToAscii (&cert->issuer),
CERT_NameToAscii (&cert->subject),
fingerprint, valid_cert ? _("GOOD") : _("BAD"));
/* construct our user prompt */
prompt = g_strdup_printf (_("SSL Certificate check for %s:\n\n%s\n\nDo you wish to accept?"),
service->url->host, cert_str);
g_free (cert_str);
/* query the user to find out if we want to accept this certificate */
accept = camel_session_alert_user (service->session, CAMEL_SESSION_ALERT_WARNING, prompt, TRUE);
g_free (prompt);
if (accept) {
#if 0
/* this is how mutt does it but last time I tried to
use CERT_AddTempCertToPerm() I got link errors and
I have also been told by the nss devs that that
function has been deprecated... */
CERTCertTrust trust;
CERT_DecodeTrustString (&trust, "P,,");
CERT_AddTempCertToPerm (cert, NULL, &trust);
#else
SECItem *certs[1];
if (!cert->trust)
cert->trust = PORT_ZAlloc (sizeof (CERTCertTrust));
cert->trust->sslFlags = CERTDB_VALID_PEER | CERTDB_TRUSTED;
certs[0] = &cert->derCert;
CERT_ImportCerts (CERT_GetDefaultCertDB (), certUsageSSLServer, 1, certs,
NULL, TRUE, FALSE, cert->nickname);
#endif
return SECSuccess;
}
return SECFailure;
}
static PRFileDesc *
enable_ssl (CamelTcpStreamSSL *ssl, PRFileDesc *fd)
{
PRFileDesc *ssl_fd;
ssl_fd = SSL_ImportFD (NULL, fd ? fd : ssl->priv->sockfd);
if (!ssl_fd)
return NULL;
SSL_OptionSet (ssl_fd, SSL_SECURITY, PR_TRUE);
SSL_SetURL (ssl_fd, ssl->priv->expected_host);
/*SSL_GetClientAuthDataHook (sslSocket, ssl_get_client_auth, (void *) certNickname);*/
/*SSL_AuthCertificateHook (ssl_fd, ssl_auth_cert, (void *) CERT_GetDefaultCertDB ());*/
SSL_BadCertHook (ssl_fd, ssl_bad_cert, ssl);
ssl->priv->ssl_mode = TRUE;
return ssl_fd;
}
static int
stream_connect (CamelTcpStream *stream, struct hostent *host, int port)
{
CamelTcpStreamSSL *ssl = CAMEL_TCP_STREAM_SSL (stream);
PRIntervalTime timeout = PR_INTERVAL_MIN;
PRNetAddr netaddr;
PRFileDesc *fd;
g_return_val_if_fail (host != NULL, -1);
memset ((void *) &netaddr, 0, sizeof (PRNetAddr));
memcpy (&netaddr.inet.ip, host->h_addr, sizeof (netaddr.inet.ip));
if (PR_InitializeNetAddr (PR_IpAddrNull, port, &netaddr) == PR_FAILURE) {
set_errno (PR_GetError ());
return -1;
}
fd = PR_OpenTCPSocket (host->h_addrtype);
if (fd == NULL) {
set_errno (PR_GetError ());
return -1;
}
if (ssl->priv->ssl_mode) {
PRFileDesc *ssl_fd;
ssl_fd = enable_ssl (ssl, fd);
if (ssl_fd == NULL) {
int errnosave;
set_errno (PR_GetError ());
errnosave = errno;
PR_Close (fd);
errno = errnosave;
return -1;
}
fd = ssl_fd;
}
if (PR_Connect (fd, &netaddr, timeout) == PR_FAILURE) {
int errnosave;
set_errno (PR_GetError ());
if (errno == EINPROGRESS) {
gboolean connected = FALSE;
PRPollDesc poll;
do {
poll.fd = fd;
poll.in_flags = PR_POLL_WRITE | PR_POLL_EXCEPT;
poll.out_flags = 0;
timeout = PR_INTERVAL_MIN;
if (PR_Poll (&poll, 1, timeout) == PR_FAILURE) {
set_errno (PR_GetError ());
goto exception;
}
if (PR_GetConnectStatus (&poll) == PR_FAILURE) {
set_errno (PR_GetError ());
if (errno != EINPROGRESS)
goto exception;
} else {
connected = TRUE;
}
} while (!connected);
} else {
exception:
errnosave = errno;
PR_Close (fd);
ssl->priv->sockfd = NULL;
errno = errnosave;
return -1;
}
errno = 0;
}
ssl->priv->sockfd = fd;
return 0;
}
static int
stream_getsockopt (CamelTcpStream *stream, CamelSockOptData *data)
{
PRSocketOptionData sodata;
memset ((void *) &sodata, 0, sizeof (sodata));
memcpy ((void *) &sodata, (void *) data, sizeof (CamelSockOptData));
if (PR_GetSocketOption (((CamelTcpStreamSSL *)stream)->priv->sockfd, &sodata) == PR_FAILURE)
return -1;
memcpy ((void *) data, (void *) &sodata, sizeof (CamelSockOptData));
return 0;
}
static int
stream_setsockopt (CamelTcpStream *stream, const CamelSockOptData *data)
{
PRSocketOptionData sodata;
memset ((void *) &sodata, 0, sizeof (sodata));
memcpy ((void *) &sodata, (void *) data, sizeof (CamelSockOptData));
if (PR_SetSocketOption (((CamelTcpStreamSSL *)stream)->priv->sockfd, &sodata) == PR_FAILURE)
return -1;
return 0;
}
static CamelTcpAddress *
stream_get_local_address (CamelTcpStream *stream)
{
PRFileDesc *sockfd = CAMEL_TCP_STREAM_SSL (stream)->priv->sockfd;
PRNetAddr addr;
PR_GetSockName (sockfd, &addr);
if (addr.inet.family != PR_AF_INET)
return NULL;
return camel_tcp_address_new (CAMEL_TCP_ADDRESS_IPV4, addr.inet.port,
4, &addr.inet.ip);
}
static CamelTcpAddress *
stream_get_remote_address (CamelTcpStream *stream)
{
PRFileDesc *sockfd = CAMEL_TCP_STREAM_SSL (stream)->priv->sockfd;
PRNetAddr addr;
PR_GetPeerName (sockfd, &addr);
if (addr.inet.family != PR_AF_INET)
return NULL;
return camel_tcp_address_new (CAMEL_TCP_ADDRESS_IPV4, addr.inet.port,
4, &addr.inet.ip);
}
#endif /* HAVE_NSS */
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