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/* saslserver.c -- shared SASL code for server-side authentication
*
* Copyright (c) 1998-2003 Carnegie Mellon University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any other legal
* details, please contact
* Office of Technology Transfer
* Carnegie Mellon University
* 5000 Forbes Avenue
* Pittsburgh, PA 15213-3890
* (412) 268-4387, fax: (412) 268-7395
* tech-transfer@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: saslserver.c,v 1.5 2003/10/22 18:30:56 rjs3 Exp $ */
#include <config.h>
#include <string.h>
#include <sasl/sasl.h>
#include <sasl/saslutil.h>
#include "prot.h"
#include "imap_err.h"
#define BASE64_BUF_SIZE 21848 /* per RFC 2222bis: ((16K / 3) + 1) * 4 */
int saslserver(sasl_conn_t *conn, const char *mech,
const char *init_resp, const char *resp_prefix,
const char *continuation,
struct protstream *pin, struct protstream *pout,
int *sasl_result, char **success_data)
{
static char base64[BASE64_BUF_SIZE+1];
char *clientin = NULL;
unsigned int clientinlen = 0;
const char *serverout;
unsigned int serveroutlen;
int r = SASL_OK;
if (success_data) *success_data = NULL;
/* initial response */
if (init_resp) {
clientin = base64;
if (!strcmp(init_resp, "=")) {
/* zero-length initial response */
base64[0] = '\0';
}
else {
r = sasl_decode64(init_resp, strlen(init_resp),
clientin, BASE64_BUF_SIZE, &clientinlen);
}
}
/* start the exchange */
if (r == SASL_OK)
r = sasl_server_start(conn, mech, clientin, clientinlen,
&serverout, &serveroutlen);
while (r == SASL_CONTINUE) {
char *p;
/* send the challenge to the client */
if (serverout) {
r = sasl_encode64(serverout, serveroutlen,
base64, BASE64_BUF_SIZE, NULL);
if (r != SASL_OK) break;
prot_printf(pout, "%s%s\r\n", continuation, base64);
}
/* get response from the client */
if (!prot_fgets(base64, BASE64_BUF_SIZE, pin) ||
strncasecmp(base64, resp_prefix, strlen(resp_prefix))) {
if (sasl_result) *sasl_result = SASL_FAIL;
return IMAP_SASL_PROTERR;
}
/* trim CRLF */
p = base64 + strlen(base64) - 1;
if (p >= base64 && *p == '\n') *p-- = '\0';
if (p >= base64 && *p == '\r') *p-- = '\0';
/* trim prefix */
p = base64 + strlen(resp_prefix);
/* check if client cancelled */
if (p[0] == '*') {
if(sasl_result) *sasl_result = SASL_BADPROT;
return IMAP_SASL_CANCEL;
}
/* decode the response */
clientin = base64;
r = sasl_decode64(p, strlen(p),
clientin, BASE64_BUF_SIZE, &clientinlen);
if (r != SASL_OK) break;
/* do the next step */
r = sasl_server_step(conn, clientin, clientinlen,
&serverout, &serveroutlen);
}
/* success data */
if (r == SASL_OK && serverout && success_data) {
r = sasl_encode64(serverout, serveroutlen,
base64, BASE64_BUF_SIZE, NULL);
if (r == SASL_OK)
*success_data = base64;
}
if(sasl_result) *sasl_result = r;
return (r == SASL_OK ? 0 : IMAP_SASL_FAIL);
}

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