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/*
* Copyright (C) 2000-1 Brendan Cully <brendan@kublai.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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, USA.
*/
/* common SASL helper routines */
#include "mutt.h"
#include "account.h"
#include "mutt_sasl.h"
#include "mutt_socket.h"
#include <sasl.h>
#include <sys/socket.h>
#include <netinet/in.h>
/* arbitrary. SASL will probably use a smaller buffer anyway. OTOH it's
* been a while since I've had access to an SASL server which negotiated
* a protection buffer. */
#define M_SASL_MAXBUF 65536
static sasl_callback_t mutt_sasl_callbacks[5];
static int mutt_sasl_start (void);
/* callbacks */
static int mutt_sasl_cb_log (void* context, int priority, const char* message);
static int mutt_sasl_cb_authname (void* context, int id, const char** result,
unsigned int* len);
static int mutt_sasl_cb_pass (sasl_conn_t* conn, void* context, int id,
sasl_secret_t** psecret);
/* socket wrappers for a SASL security layer */
static int mutt_sasl_conn_open (CONNECTION* conn);
static int mutt_sasl_conn_close (CONNECTION* conn);
static int mutt_sasl_conn_read (CONNECTION* conn, char* buf, size_t len);
static int mutt_sasl_conn_write (CONNECTION* conn, const char* buf,
size_t count);
/* mutt_sasl_start: called before doing a SASL exchange - initialises library
* (if neccessary). */
int mutt_sasl_start (void)
{
static unsigned char sasl_init = 0;
sasl_callback_t* callback, callbacks[2];
int rc;
if (sasl_init)
return SASL_OK;
/* set up default logging callback */
callback = callbacks;
callback->id = SASL_CB_LOG;
callback->proc = mutt_sasl_cb_log;
callback->context = NULL;
callback++;
callback->id = SASL_CB_LIST_END;
callback->proc = NULL;
callback->context = NULL;
rc = sasl_client_init (callbacks);
if (rc != SASL_OK)
{
dprint (1, (debugfile, "mutt_sasl_start: libsasl initialisation failed.\n"));
return SASL_FAIL;
}
sasl_init = 1;
return SASL_OK;
}
/* mutt_sasl_client_new: wrapper for sasl_client_new which also sets various
* security properties. If this turns out to be fine for POP too we can
* probably stop exporting mutt_sasl_get_callbacks(). */
int mutt_sasl_client_new (CONNECTION* conn, sasl_conn_t** saslconn)
{
sasl_security_properties_t secprops;
sasl_external_properties_t extprops;
const char* service;
int rc;
if (mutt_sasl_start () != SASL_OK)
return -1;
switch (conn->account.type)
{
case M_ACCT_TYPE_IMAP:
service = "imap";
break;
case M_ACCT_TYPE_POP:
service = "pop-3";
break;
default:
dprint (1, (debugfile, "mutt_sasl_client_new: account type unset\n"));
return -1;
}
rc = sasl_client_new (service, conn->account.host,
mutt_sasl_get_callbacks (&conn->account), SASL_SECURITY_LAYER, saslconn);
if (rc != SASL_OK)
{
dprint (1, (debugfile,
"mutt_sasl_client_new: Error allocating SASL connection\n"));
return -1;
}
/*** set sasl IP properties, necessary for use with krb4 ***/
/* Do we need to fail if this fails? I would assume having these unset
* would just disable KRB4. Who wrote this code? I'm not sure how this
* interacts with the NSS code either, since that mucks with the fd. */
{
struct sockaddr_in local, remote;
socklen_t size;
size = sizeof (local);
if (getsockname (conn->fd, (struct sockaddr*) &local, &size))
return -1;
size = sizeof(remote);
if (getpeername(conn->fd, (struct sockaddr*) &remote, &size))
return -1;
#ifdef SASL_IP_LOCAL
if (sasl_setprop(*saslconn, SASL_IP_LOCAL, &local) != SASL_OK)
{
dprint (1, (debugfile,
"mutt_sasl_client_new: Error setting local IP address\n"));
return -1;
}
#endif
#ifdef SASL_IP_REMOTE
if (sasl_setprop(*saslconn, SASL_IP_REMOTE, &remote) != SASL_OK)
{
dprint (1, (debugfile,
"mutt_sasl_client_new: Error setting remote IP address\n"));
return -1;
}
#endif
}
/* set security properties. We use NOPLAINTEXT globally, since we can
* just fall back to LOGIN in the IMAP case anyway. If that doesn't
* work for POP, we can make it a flag or move this code into
* imap/auth_sasl.c */
memset (&secprops, 0, sizeof (secprops));
secprops.max_ssf = (sasl_ssf_t) -1;
secprops.maxbufsize = M_SASL_MAXBUF;
secprops.security_flags |= SASL_SEC_NOPLAINTEXT;
if (sasl_setprop (*saslconn, SASL_SEC_PROPS, &secprops) != SASL_OK)
{
dprint (1, (debugfile,
"mutt_sasl_client_new: Error setting security properties\n"));
return -1;
}
/* we currently don't have an SSF finder for NSS (I don't know the API).
* If someone does it'd probably be trivial to write mutt_nss_get_ssf().
* I have a feeling more SSL code could be shared between those two files,
* but I haven't looked into it yet, since I still don't know the APIs. */
#if defined(USE_SSL) && !defined(USE_NSS)
if (conn->account.flags & M_ACCT_SSL)
{
memset (&extprops, 0, sizeof (extprops));
extprops.ssf = conn->ssf;
dprint (2, (debugfile, "External SSF: %d\n", extprops.ssf));
if (sasl_setprop (*saslconn, SASL_SSF_EXTERNAL, &extprops) != SASL_OK)
{
dprint (1, (debugfile, "mutt_sasl_client_new: Error setting external properties\n"));
return -1;
}
}
#endif
return 0;
}
sasl_callback_t* mutt_sasl_get_callbacks (ACCOUNT* account)
{
sasl_callback_t* callback;
callback = mutt_sasl_callbacks;
callback->id = SASL_CB_AUTHNAME;
callback->proc = mutt_sasl_cb_authname;
callback->context = account;
callback++;
callback->id = SASL_CB_USER;
callback->proc = mutt_sasl_cb_authname;
callback->context = account;
callback++;
callback->id = SASL_CB_PASS;
callback->proc = mutt_sasl_cb_pass;
callback->context = account;
callback++;
callback->id = SASL_CB_GETREALM;
callback->proc = NULL;
callback->context = NULL;
callback++;
callback->id = SASL_CB_LIST_END;
callback->proc = NULL;
callback->context = NULL;
return mutt_sasl_callbacks;
}
int mutt_sasl_interact (sasl_interact_t* interaction)
{
char prompt[SHORT_STRING];
char resp[SHORT_STRING];
while (interaction->id != SASL_CB_LIST_END)
{
dprint (2, (debugfile, "mutt_sasl_interact: filling in SASL interaction %ld.\n", interaction->id));
snprintf (prompt, sizeof (prompt), "%s: ", interaction->prompt);
resp[0] = '\0';
if (mutt_get_field (prompt, resp, sizeof (resp), 0))
return SASL_FAIL;
interaction->len = mutt_strlen (resp)+1;
interaction->result = safe_malloc (interaction->len);
memcpy (interaction->result, resp, interaction->len);
interaction++;
}
return SASL_OK;
}
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