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/* $Id: kadm_ser_wrap.c,v 1.3 1997/02/19 06:08:37 tholo Exp $ */
/*-
* Copyright (C) 1989 by the Massachusetts Institute of Technology
*
* Export of this software from the United States of America is assumed
* to 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.
*/
/*
* Kerberos administration server-side support functions
*/
/*
kadm_ser_wrap.c
unwraps wrapped packets and calls the appropriate server subroutine
*/
#include <kadm_locl.h>
#include <sys/param.h>
/* GLOBAL */
Kadm_Server server_parm;
/*
kadm_ser_init
set up the server_parm structure
*/
int
kadm_ser_init(int inter, char *realm)
/* interactive or from file */
{
struct servent *sep;
struct hostent *hp;
char *dot, admin[MAXHOSTNAMELEN], hostname[MAXHOSTNAMELEN];
(void) init_kadm_err_tbl();
(void) init_krb_err_tbl();
if (gethostname(hostname, sizeof(hostname)))
return KADM_NO_HOSTNAME;
(void) strcpy(server_parm.sname, PWSERV_NAME);
if (krb_get_admhst(admin, realm, 1) != KSUCCESS)
return KADM_NO_MAST;
if ((dot = strchr(admin, '.')) != NULL)
*dot = '\0';
(void) strcpy(server_parm.sinst, admin);
(void) strcpy(server_parm.krbrlm, realm);
server_parm.admin_fd = -1;
/* setting up the addrs */
if ((sep = getservbyname(KADM_SNAME, "tcp")) == NULL)
return KADM_NO_SERV;
bzero((char *)&server_parm.admin_addr,sizeof(server_parm.admin_addr));
server_parm.admin_addr.sin_family = AF_INET;
if ((hp = gethostbyname(hostname)) == NULL)
return KADM_NO_HOSTNAME;
bcopy(hp->h_addr, (char *) &server_parm.admin_addr.sin_addr.s_addr,
hp->h_length);
server_parm.admin_addr.sin_port = sep->s_port;
/* setting up the database */
if (kdb_get_master_key((inter==1), &server_parm.master_key,
server_parm.master_key_schedule) != 0)
return KADM_NO_MAST;
if ((server_parm.master_key_version =
kdb_verify_master_key(&server_parm.master_key,
server_parm.master_key_schedule,stderr))<0)
return KADM_NO_VERI;
return KADM_SUCCESS;
}
static void errpkt(u_char **dat, int *dat_len, int code)
{
u_int32_t retcode;
char *pdat;
free((char *)*dat); /* free up req */
*dat_len = KADM_VERSIZE + sizeof(u_int32_t);
*dat = (u_char *) malloc((unsigned)*dat_len);
pdat = (char *) *dat;
retcode = htonl((u_int32_t) code);
(void) strncpy(pdat, KADM_ULOSE, KADM_VERSIZE);
bcopy((char *)&retcode, &pdat[KADM_VERSIZE], sizeof(u_int32_t));
return;
}
/*
kadm_ser_in
unwrap the data stored in dat, process, and return it.
*/
int
kadm_ser_in(u_char **dat, int *dat_len)
{
u_char *in_st; /* pointer into the sent packet */
int in_len,retc; /* where in packet we are, for
returns */
u_int32_t r_len; /* length of the actual packet */
KTEXT_ST authent; /* the authenticator */
AUTH_DAT ad; /* who is this, klink */
u_int32_t ncksum; /* checksum of encrypted data */
des_key_schedule sess_sched; /* our schedule */
MSG_DAT msg_st;
u_char *retdat, *tmpdat;
int retval, retlen;
if (strncmp(KADM_VERSTR, (char *)*dat, KADM_VERSIZE)) {
errpkt(dat, dat_len, KADM_BAD_VER);
return KADM_BAD_VER;
}
in_len = KADM_VERSIZE;
/* get the length */
if ((retc = stv_long(*dat, &r_len, in_len, *dat_len)) < 0)
return KADM_LENGTH_ERROR;
in_len += retc;
authent.length = *dat_len - r_len - KADM_VERSIZE - sizeof(u_int32_t);
bcopy((char *)(*dat) + in_len, (char *)authent.dat, authent.length);
authent.mbz = 0;
/* service key should be set before here */
if ((retc = krb_rd_req(&authent, server_parm.sname, server_parm.sinst,
server_parm.recv_addr.sin_addr.s_addr, &ad, (char *)0)))
{
errpkt(dat, dat_len,retc + krb_err_base);
return retc + krb_err_base;
}
#define clr_cli_secrets() {bzero((char *)sess_sched, sizeof(sess_sched)); bzero((char *)ad.session, sizeof(ad.session));}
in_st = *dat + *dat_len - r_len;
#ifdef NOENCRYPTION
ncksum = 0;
#else
ncksum = des_quad_cksum((des_cblock *)in_st, (des_cblock *)0, (long) r_len, 0, &ad.session);
#endif
if (ncksum!=ad.checksum) { /* yow, are we correct yet */
clr_cli_secrets();
errpkt(dat, dat_len,KADM_BAD_CHK);
return KADM_BAD_CHK;
}
#ifdef NOENCRYPTION
bzero(sess_sched, sizeof(sess_sched));
#else
des_key_sched(&ad.session, sess_sched);
#endif
if ((retc = (int) krb_rd_priv(in_st, r_len, sess_sched, &ad.session,
&server_parm.recv_addr,
&server_parm.admin_addr, &msg_st))) {
clr_cli_secrets();
errpkt(dat, dat_len,retc + krb_err_base);
return retc + krb_err_base;
}
switch (msg_st.app_data[0]) {
case CHANGE_PW:
retval = kadm_ser_cpw(msg_st.app_data+1,(int) msg_st.app_length,&ad,
&retdat, &retlen);
break;
case ADD_ENT:
retval = kadm_ser_add(msg_st.app_data+1,(int) msg_st.app_length,&ad,
&retdat, &retlen);
break;
case GET_ENT:
retval = kadm_ser_get(msg_st.app_data+1,(int) msg_st.app_length,&ad,
&retdat, &retlen);
break;
case MOD_ENT:
retval = kadm_ser_mod(msg_st.app_data+1,(int) msg_st.app_length,&ad,
&retdat, &retlen);
break;
default:
clr_cli_secrets();
errpkt(dat, dat_len, KADM_NO_OPCODE);
return KADM_NO_OPCODE;
}
/* Now seal the response back into a priv msg */
free((char *)*dat);
tmpdat = (u_char *) malloc((unsigned)(retlen + KADM_VERSIZE +
sizeof(u_int32_t)));
(void) strncpy((char *)tmpdat, KADM_VERSTR, KADM_VERSIZE);
retval = htonl((u_int32_t)retval);
bcopy((char *)&retval, (char *)tmpdat + KADM_VERSIZE, sizeof(u_int32_t));
if (retlen) {
bcopy((char *)retdat, (char *)tmpdat + KADM_VERSIZE + sizeof(u_int32_t),
retlen);
free((char *)retdat);
}
/* slop for mk_priv stuff */
*dat = (u_char *) malloc((unsigned) (retlen + KADM_VERSIZE +
sizeof(u_int32_t) + 200));
if ((*dat_len = krb_mk_priv(tmpdat, *dat,
(u_int32_t) (retlen + KADM_VERSIZE +
sizeof(u_int32_t)),
sess_sched,
&ad.session, &server_parm.admin_addr,
&server_parm.recv_addr)) < 0) {
clr_cli_secrets();
errpkt(dat, dat_len, KADM_NO_ENCRYPT);
return KADM_NO_ENCRYPT;
}
clr_cli_secrets();
return KADM_SUCCESS;
}
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