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/* $Id: authsaslcram.c,v 1.6 2006/06/01 10:47:32 mrsam Exp $ */
/*
** Copyright 1998 - 2006 Double Precision, Inc. See COPYING for
** distribution information.
*/
#include "courier_auth_config.h"
#include "random128/random128.h"
#include "courierauthsasl.h"
#include <stdlib.h>
#include <string.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <ctype.h>
#include <stdio.h>
#include <errno.h>
extern char *strdupdefdomain(const char *userid, const char *s1,
const char *s2, const char *s3);
int authsasl_cram(const char *method, const char *initresponse,
char *(*getresp)(const char *, void *),
void *callback_arg,
char **authtype,
char **authdata)
{
const char *randtoken;
char hostnamebuf[256];
char *challenge;
char *challenge_base64;
char *response;
char *chrsp;
char *q, *r, *s, *t;
int plen;
if (initresponse && *initresponse)
{
if (write(2, "authsasl_cram: invalid request.\n", 32) < 0)
; /* ignore gcc warning */
return (AUTHSASL_ERROR);
}
randtoken=random128();
hostnamebuf[0]=0;
if (gethostname(hostnamebuf, sizeof(hostnamebuf)-1))
strcpy(hostnamebuf, "cram");
challenge=malloc(strlen(randtoken)+strlen(hostnamebuf)
+sizeof("<@>"));
if (!challenge)
{
perror("malloc");
return (AUTHSASL_ERROR);
}
strcat(strcat(strcat(strcat(strcpy(challenge, "<"),
randtoken), "@"), hostnamebuf), ">");
challenge_base64=authsasl_tobase64(challenge, -1);
free(challenge);
if (!challenge_base64)
{
perror("malloc");
return (AUTHSASL_ERROR);
}
response=getresp(challenge_base64, callback_arg);
if (!response)
{
free(challenge_base64);
return (AUTHSASL_ERROR);
}
if (*response == '*')
{
free(challenge_base64);
free(response);
return (AUTHSASL_ABORTED);
}
/* If DEFDOMAIN is set, pick apart the response and reassemble
* it, potentially with a default domain appended to the username */
q=getenv("DEFDOMAIN");
if (q && q[0])
{
r = 0;
if ( (plen = authsasl_frombase64(response)) > 0 &&
(response[plen]=0, (s = strchr(response, ' ')) != 0) &&
(*s++ = 0, (t = strdupdefdomain(response, " ", s, "")) != 0) )
{
r = authsasl_tobase64(t, -1);
free(t);
}
free(response);
if ((response = r) == 0)
{
free(challenge_base64);
return (AUTHSASL_ERROR);
}
}
chrsp=malloc(strlen(challenge_base64)+strlen(response)+3);
if (!chrsp)
{
free(challenge_base64);
free(response);
perror("malloc");
return (AUTHSASL_ERROR);
}
strcat(strcat(strcat(strcpy(chrsp, challenge_base64), "\n"),
response), "\n");
free(challenge_base64);
free(response);
if ( (*authtype=malloc(strlen(method)+1)) == 0)
{
free(chrsp);
perror("malloc");
return (AUTHSASL_ERROR);
}
strcpy( *authtype, method );
*authdata=chrsp;
for (chrsp= *authtype; *chrsp; chrsp++)
*chrsp= tolower( (int)(unsigned char)*chrsp );
return (AUTHSASL_OK);
}
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