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/* ========================================================================
* Copyright 1988-2007 University of Washington
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
*
* ========================================================================
*/
/*
* Program: Kerberos 5 check password
*
* Author: Mark Crispin
* Networks and Distributed Computing
* Computing & Communications
* University of Washington
* Administration Building, AG-44
* Seattle, WA 98195
* Internet: MRC@CAC.Washington.EDU
*
* Date: 1 August 1988
* Last Edited: 11 October 2007
*/
/* Check password
* Accepts: login passwd struct
* password string
* argument count
* argument vector
* Returns: passwd struct if password validated, NIL otherwise
*/
struct passwd *checkpw (struct passwd *pw,char *pass,int argc,char *argv[])
{
char svrnam[MAILTMPLEN],cltnam[MAILTMPLEN];
krb5_context ctx;
krb5_timestamp now;
krb5_principal service;
krb5_ccache ccache;
krb5_error_code code;
krb5_creds *crd = (krb5_creds *) memset (fs_get (sizeof (krb5_creds)),0,
sizeof (krb5_creds));
struct passwd *ret = NIL;
if (*pass) { /* only if password non-empty */
/* make service name */
sprintf (svrnam,"%.80s@%.512s",
(char *) mail_parameters (NIL,GET_SERVICENAME,NIL),
tcp_serverhost ());
/* make client name with principal */
sprintf (cltnam,"%.80s/%.80s",pw->pw_name,
(char *) mail_parameters (NIL,GET_SERVICENAME,NIL));
/* get a context */
if (!krb5_init_context (&ctx)) {
/* get time, client and server principals */
if (!krb5_timeofday (ctx,&now) &&
/* Normally, kerb_cp_svr_name (defined/set in env_unix.c) is NIL, so
* only the user name is used as a client principal. A few sites want
* to have separate client principals for different services, but many
* other sites vehemently object...
*/
!krb5_parse_name (ctx,kerb_cp_svr_name ? cltnam : pw->pw_name,
&crd->client) &&
!krb5_parse_name (ctx,svrnam,&service) &&
!krb5_build_principal_ext(ctx,&crd->server,
krb5_princ_realm (ctx,crd->client)->length,
krb5_princ_realm (ctx,crd->client)->data,
KRB5_TGS_NAME_SIZE,KRB5_TGS_NAME,
krb5_princ_realm (ctx,crd->client)->length,
krb5_princ_realm (ctx,crd->client)->data,
0)) {
/* expire in 3 minutes */
crd->times.endtime = now + (3 * 60);
if (krb5_cc_resolve (ctx,"MEMORY:pwk",&ccache) ||
krb5_cc_initialize (ctx,ccache,crd->client)) ccache = 0;
if (!krb5_get_in_tkt_with_password (ctx,NIL,NIL,NIL,NIL,pass,ccache,
crd,0) &&
!krb5_verify_init_creds (ctx,crd,service,0,ccache ? &ccache : 0,0))
ret = pw;
krb5_free_creds (ctx,crd);/* flush creds and service principal */
krb5_free_principal (ctx,service);
}
krb5_free_context (ctx); /* don't need context any more */
}
}
return ret;
}
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