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/*
* lib/krb5/krb/sendauth.c
*
* Copyright 1991 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*
* convenience sendauth/recvauth functions
*/
#define NEED_SOCKETS
#include "k5-int.h"
#include "com_err.h"
#include "auth_con.h"
#include <errno.h>
#include <stdio.h>
#include <string.h>
static char *sendauth_version = "KRB5_SENDAUTH_V1.0";
krb5_error_code
krb5_sendauth(context, auth_context,
/* IN */
fd, appl_version, client, server, ap_req_options, in_data,
in_creds,
/* IN/OUT */
ccache,
/* OUT */
error, rep_result, out_creds)
krb5_context context;
krb5_auth_context * auth_context;
krb5_pointer fd;
char * appl_version;
krb5_principal client;
krb5_principal server;
krb5_flags ap_req_options;
krb5_data * in_data;
krb5_creds * in_creds;
krb5_ccache ccache;
krb5_error ** error;
krb5_ap_rep_enc_part ** rep_result;
krb5_creds ** out_creds;
{
krb5_octet result;
krb5_creds creds;
krb5_creds * credsp = NULL;
krb5_creds * credspout = NULL;
krb5_error_code retval = 0;
krb5_data inbuf, outbuf;
int len;
krb5_ccache use_ccache = 0;
if (error)
*error = 0;
/*
* First, send over the length of the sendauth version string;
* then, we send over the sendauth version. Next, we send
* over the length of the application version strings followed
* by the string itself.
*/
outbuf.length = strlen(sendauth_version) + 1;
outbuf.data = sendauth_version;
if ((retval = krb5_write_message(context, fd, &outbuf)))
return(retval);
outbuf.length = strlen(appl_version) + 1;
outbuf.data = appl_version;
if ((retval = krb5_write_message(context, fd, &outbuf)))
return(retval);
/*
* Now, read back a byte: 0 means no error, 1 means bad sendauth
* version, 2 means bad application version
*/
#ifndef ECONNABORTED
#define ECONNABORTED WSAECONNABORTED
#endif
if ((len = krb5_net_read(context, *((int *) fd), (char *)&result, 1)) != 1)
return((len < 0) ? errno : ECONNABORTED);
if (result == 1)
return(KRB5_SENDAUTH_BADAUTHVERS);
else if (result == 2)
return(KRB5_SENDAUTH_BADAPPLVERS);
else if (result != 0)
return(KRB5_SENDAUTH_BADRESPONSE);
/*
* We're finished with the initial negotiations; let's get and
* send over the authentication header. (The AP_REQ message)
*/
/*
* If no credentials were provided, try getting it from the
* credentials cache.
*/
memset((char *)&creds, 0, sizeof(creds));
/*
* See if we need to access the credentials cache
*/
if (!in_creds || !in_creds->ticket.length) {
if (ccache)
use_ccache = ccache;
else if ((retval = krb5_cc_default(context, &use_ccache)))
goto error_return;
}
if (!in_creds) {
if ((retval = krb5_copy_principal(context, server,
&creds.server)))
goto error_return;
if (client)
retval = krb5_copy_principal(context, client,
&creds.client);
else
retval = krb5_cc_get_principal(context, use_ccache,
&creds.client);
if (retval) {
krb5_free_principal(context, creds.server);
goto error_return;
}
/* creds.times.endtime = 0; -- memset 0 takes care of this
zero means "as long as possible" */
/* creds.keyblock.enctype = 0; -- as well as this.
zero means no session enctype
preference */
in_creds = &creds;
}
if (!in_creds->ticket.length) {
if ((retval = krb5_get_credentials(context, 0,
use_ccache, in_creds, &credsp)))
goto error_return;
credspout = credsp;
} else {
credsp = in_creds;
}
if ((retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
in_data, credsp, &outbuf)))
goto error_return;
/*
* First write the length of the AP_REQ message, then write
* the message itself.
*/
retval = krb5_write_message(context, fd, &outbuf);
free(outbuf.data);
if (retval)
goto error_return;
/*
* Now, read back a message. If it was a null message (the
* length was zero) then there was no error. If not, we the
* authentication was rejected, and we need to return the
* error structure.
*/
if ((retval = krb5_read_message(context, fd, &inbuf)))
goto error_return;
if (inbuf.length) {
if (error) {
if ((retval = krb5_rd_error(context, &inbuf, error))) {
krb5_xfree(inbuf.data);
goto error_return;
}
}
retval = KRB5_SENDAUTH_REJECTED;
krb5_xfree(inbuf.data);
goto error_return;
}
/*
* If we asked for mutual authentication, we should now get a
* length field, followed by a AP_REP message
*/
if ((ap_req_options & AP_OPTS_MUTUAL_REQUIRED)) {
krb5_ap_rep_enc_part *repl = 0;
if ((retval = krb5_read_message(context, fd, &inbuf)))
goto error_return;
if ((retval = krb5_rd_rep(context, *auth_context, &inbuf,
&repl))) {
if (repl)
krb5_free_ap_rep_enc_part(context, repl);
krb5_xfree(inbuf.data);
goto error_return;
}
krb5_xfree(inbuf.data);
/*
* If the user wants to look at the AP_REP message,
* copy it for him
*/
if (rep_result)
*rep_result = repl;
else
krb5_free_ap_rep_enc_part(context, repl);
}
retval = 0; /* Normal return */
if (out_creds) {
*out_creds = credsp;
}
error_return:
krb5_free_cred_contents(context, &creds);
if (credspout)
krb5_free_creds(context, credspout);
if (!ccache && use_ccache)
krb5_cc_close(context, use_ccache);
return(retval);
}
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