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/*
* appl/telnet/libtelnet/forward.c
*/
/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/* General-purpose forwarding routines. These routines may be put into */
/* libkrb5.a to allow widespread use */
#if defined(KERBEROS) || defined(KRB5)
#include <stdio.h>
#include <pwd.h>
#include <netdb.h>
#include "k5-int.h"
/* Decode, decrypt and store the forwarded creds in the local ccache. */
krb5_error_code
rd_and_store_for_creds(context, auth_context, inbuf, ticket, lusername)
krb5_context context;
krb5_auth_context * auth_context;
krb5_data *inbuf;
krb5_ticket *ticket;
char *lusername;
{
krb5_creds **creds;
krb5_error_code retval;
char ccname[35];
krb5_ccache ccache = NULL;
struct passwd *pwd;
if (!(pwd = (struct passwd *) getpwnam(lusername)))
return -1;
if (retval = krb5_rd_cred(context, auth_context, inbuf, &creds, NULL))
return(retval);
sprintf(ccname, "FILE:/tmp/krb5cc_%d", pwd->pw_uid);
if (retval = krb5_cc_resolve(context, ccname, &ccache))
goto cleanup;
if (retval = krb5_cc_initialize(context, ccache, ticket->enc_part2->client))
goto cleanup;
if (retval = krb5_cc_store_cred(context, ccache, *creds))
goto cleanup;
if (retval = chown(ccname+5, pwd->pw_uid, -1))
goto cleanup;
cleanup:
krb5_free_creds(context, *creds);
return retval;
}
#define KRB5_DEFAULT_LIFE 60*60*8 /* 8 hours */
/* helper function: convert flags to necessary KDC options */
#define flags2options(flags) (flags & KDC_TKT_COMMON_MASK)
/* Get a TGT for use at the remote host */
krb5_error_code INTERFACE
get_for_creds(context, auth_context, rhost, client, forwardable, outbuf)
krb5_context context;
krb5_auth_context * auth_context;
char *rhost;
krb5_principal client;
int forwardable; /* Should forwarded TGT also be forwardable? */
krb5_data *outbuf;
{
krb5_replay_data replaydata;
krb5_data * scratch;
struct hostent *hp;
krb5_address **addrs;
krb5_error_code retval;
krb5_error *err_reply;
krb5_creds creds, tgt;
krb5_creds *pcreds;
krb5_ccache cc;
krb5_flags kdcoptions;
krb5_timestamp now;
char *remote_host = 0;
char **hrealms = 0;
int i;
memset((char *)&creds, 0, sizeof(creds));
if (!rhost || !(hp = gethostbyname(rhost)))
return KRB5_ERR_BAD_HOSTNAME;
remote_host = (char *) malloc(strlen(hp->h_name)+1);
if (!remote_host) {
retval = ENOMEM;
goto errout;
}
strcpy(remote_host, hp->h_name);
if (retval = krb5_get_host_realm(context, remote_host, &hrealms))
goto errout;
if (!hrealms[0]) {
retval = KRB5_ERR_HOST_REALM_UNKNOWN;
goto errout;
}
/* Count elements */
for(i=0; hp->h_addr_list[i]; i++);
addrs = (krb5_address **) malloc ((i+1)*sizeof(*addrs));
if (!addrs) {
retval = ENOMEM;
goto errout;
}
memset(addrs, 0, (i+1)*sizeof(*addrs));
for(i=0; hp->h_addr_list[i]; i++) {
addrs[i] = (krb5_address *) malloc(sizeof(krb5_address));
if (!addrs[i]) {
retval = ENOMEM;
goto errout;
}
addrs[i]->addrtype = hp->h_addrtype;
addrs[i]->length = hp->h_length;
addrs[i]->contents = (unsigned char *)malloc(addrs[i]->length);
if (!addrs[i]->contents) {
retval = ENOMEM;
goto errout;
}
memcpy ((char *)addrs[i]->contents, hp->h_addr_list[i],
addrs[i]->length);
}
addrs[i] = 0;
if (retval = krb5_copy_principal(context, client, &creds.client))
goto errout;
if (retval = krb5_build_principal_ext(context, &creds.server,
strlen(hrealms[0]),
hrealms[0],
KRB5_TGS_NAME_SIZE,
KRB5_TGS_NAME,
client->realm.length,
client->realm.data,
0))
goto errout;
creds.times.starttime = 0;
if (retval = krb5_timeofday(context, &now))
goto errout;
creds.times.endtime = now + KRB5_DEFAULT_LIFE;
creds.times.renew_till = 0;
if (retval = krb5_cc_default(context, &cc))
goto errout;
/* fetch tgt directly from cache */
retval = krb5_cc_retrieve_cred (context, cc, KRB5_TC_MATCH_SRV_NAMEONLY,
&creds, &tgt);
krb5_cc_close(context, cc);
if (retval)
goto errout;
/* tgt->client must be equal to creds.client */
if (!krb5_principal_compare(context, tgt.client, creds.client)) {
retval = KRB5_PRINC_NOMATCH;
goto errout;
}
if (!tgt.ticket.length) {
retval = KRB5_NO_TKT_SUPPLIED;
goto errout;
}
kdcoptions = flags2options(tgt.ticket_flags)|KDC_OPT_FORWARDED;
if (!forwardable) /* Reset KDC_OPT_FORWARDABLE */
kdcoptions &= ~(KDC_OPT_FORWARDABLE);
if (retval = krb5_get_cred_via_tkt(context, &tgt, kdcoptions,
addrs, &creds, &pcreds))
goto errout;
retval = krb5_mk_1cred(context, auth_context, pcreds,
&scratch, &replaydata);
krb5_free_creds(context, pcreds);
*outbuf = *scratch;
krb5_xfree(scratch);
errout:
if (remote_host)
free(remote_host);
if (hrealms)
krb5_xfree(hrealms);
if (addrs)
krb5_free_addresses(context, addrs);
krb5_free_cred_contents(context, &creds);
return retval;
}
#endif /* defined(KRB5) && defined(FORWARD) */
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