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/*
* $Source$
* $Author$
*
* 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
*/
#if !defined(lint) && !defined(SABER)
static char rcsid_sendauth_c [] =
"$Id$";
#endif /* !lint & !SABER */
#include <krb5/krb5.h>
#include <krb5/osconf.h>
#include <krb5/kdb.h>
#include <krb5/kdb_dbm.h>
#include <krb5/ext-proto.h>
#include <krb5/los-proto.h>
#include <com_err.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <netinet/in.h>
#define WORKING_RCACHE
extern krb5_flags krb5_kdc_default_options;
static char *sendauth_version = "KRB5_SENDAUTH_V1.0";
krb5_error_code
krb5_sendauth(/* IN */
fd, appl_version, client, server, ap_req_options,
checksump,
/* IN/OUT */
credsp, ccache,
/* OUT */
sequence, newkey,
error, rep_result)
krb5_pointer fd;
char *appl_version;
krb5_principal client;
krb5_principal server;
krb5_flags ap_req_options;
krb5_int32 *sequence;
krb5_keyblock **newkey;
krb5_checksum *checksump;
krb5_creds *credsp;
krb5_ccache ccache;
krb5_error **error;
krb5_ap_rep_enc_part **rep_result;
{
krb5_flags kdc_options = krb5_kdc_default_options;
krb5_octet result;
krb5_creds creds;
krb5_error_code retval = 0;
krb5_authenticator authent;
krb5_data inbuf, outbuf;
int len;
/*
* 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(fd, &outbuf))
return(retval);
outbuf.length = strlen(appl_version) + 1;
outbuf.data = appl_version;
if (retval = krb5_write_message(fd, &outbuf))
return(retval);
/*
* Now, read back a byte: 0 means no error, 1 means bad sendauth
* version, 2 means bad application version
*/
if ((len = krb5_net_read(*((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));
if (!credsp) {
if (!ccache)
return(KRB5_NOCREDS_SUPPLIED);
if (retval = krb5_copy_principal(server, &creds.server))
return(retval);
if (retval = krb5_copy_principal(client, &creds.client)) {
krb5_free_principal(creds.server);
return(retval);
}
/* creds.times.endtime = 0; -- memset 0 takes care of this
zero means "as long as possible" */
/* creds.keyblock.keytype = 0; -- as well as this.
zero means no session keytype
preference */
credsp = &creds;
}
if (!credsp->ticket.length) {
if (retval = krb5_get_credentials(kdc_options,
ccache,
&creds)) {
krb5_free_cred_contents(&creds);
return(retval);
}
}
/*
* Generate a random sequence number
*/
if (sequence &&
(retval = krb5_generate_seq_number(&credsp->keyblock, sequence))) {
memset((char *)&authent, 0, sizeof(authent));
krb5_free_cred_contents(&creds);
return(retval);
}
/*
* OK, get the authentication header!
*/
if (retval = krb5_mk_req_extended(ap_req_options, checksump,
kdc_options,
sequence ? *sequence : 0, newkey,
ccache, credsp, &authent, &outbuf)) {
memset((char *)&authent, 0, sizeof(authent));
krb5_free_cred_contents(&creds);
return(retval);
}
/*
* First write the length of the AP_REQ message, then write
* the message itself.
*/
if (retval = krb5_write_message(fd, &outbuf)) {
krb5_free_cred_contents(&creds);
memset((char *)&authent, 0, sizeof(authent));
return(retval);
}
free(outbuf.data);
/*
* 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(fd, &inbuf)) {
krb5_free_cred_contents(&creds);
memset((char *)&authent, 0, sizeof(authent));
return(retval);
}
if (inbuf.length) {
if (error) {
if (retval = krb5_rd_error(&inbuf, error)) {
xfree(inbuf.data);
return(retval);
}
}
xfree(inbuf.data);
krb5_free_cred_contents(&creds);
memset((char *)&authent, 0, sizeof(authent));
return(KRB5_SENDAUTH_REJECTED);
}
/*
* 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;
krb5_error_code problem = 0;
if (retval = krb5_read_message(fd, &inbuf)) {
krb5_free_cred_contents(&creds);
memset((char *)&authent, 0, sizeof(authent));
return(retval);
}
problem = krb5_rd_rep(&inbuf,
&credsp->keyblock,
&repl);
if (problem || ((repl->ctime != authent.ctime) ||
(repl->cusec != authent.cusec)))
problem = KRB5_SENDAUTH_MUTUAL_FAILED;
memset((char *)&authent, 0, sizeof(authent));
krb5_free_cred_contents(&creds);
xfree(inbuf.data);
if (problem) {
krb5_free_ap_rep_enc_part(repl);
return(problem);
}
/*
* 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(repl);
} else
krb5_free_cred_contents(&creds);
return(0);
}
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