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/*
* $Source$
* $Author$
*
* Copyright 1988 by the Massachusetts Institute of Technology.
*
* For copying and distribution information, please see the file
* <mit-copyright.h>.
*
* Kerberos administration server-side support functions
*/
#ifndef lint
static char rcsid_module_c[] =
"$Header$";
#endif lint
#include <mit-copyright.h>
/*
kadm_ser_wrap.c
unwraps wrapped packets and calls the appropriate server subroutine
*/
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <netdb.h>
#include <sys/socket.h>
#include <krb.h>
#include <kadm.h>
#include <kadm_err.h>
#include <krb_err.h>
#include <syslog.h>
#include "kadm_server.h"
#ifdef OVSEC_KADM
#include <ovsec_admin/admin.h>
extern void *ovsec_handle;
#endif
Kadm_Server server_parm;
/*
kadm_ser_init
set up the server_parm structure
*/
kadm_ser_init(inter, realm)
int inter; /* interactive or from file */
char realm[];
{
struct servent *sep;
struct hostent *hp;
char hostname[MAXHOSTNAMELEN];
char *mkey_name;
krb5_error_code retval;
int numfound = 1;
krb5_boolean more;
krb5_db_entry master_entry;
if (gethostname(hostname, sizeof(hostname)))
return KADM_NO_HOSTNAME;
(void) strcpy(server_parm.sname, PWSERV_NAME);
(void) strcpy(server_parm.sinst, KRB_MASTER);
(void) strcpy(server_parm.krbrlm, realm);
if (krb5_build_principal(&server_parm.sprinc,
strlen(realm),
realm,
PWSERV_NAME,
KRB_MASTER, 0))
return KADM_NO_MAST;
/* setting up the addrs */
server_parm.admin_fd = -1;
if ((sep = getservbyname(KADM_SNAME, "tcp")) == NULL)
return KADM_NO_SERV;
memset((char *)&server_parm.admin_addr, 0,sizeof(server_parm.admin_addr));
server_parm.admin_addr.sin_family = AF_INET;
if ((hp = gethostbyname(hostname)) == NULL)
return KADM_NO_HOSTNAME;
memcpy((char *) &server_parm.admin_addr.sin_addr.s_addr, hp->h_addr,
hp->h_length);
server_parm.admin_addr.sin_port = sep->s_port;
/* setting up the database */
mkey_name = KRB5_KDB_M_NAME;
server_parm.master_keyblock.keytype = KEYTYPE_DES;
#ifdef PROVIDE_DES_CBC_CRC
#ifdef KRB5B4
server_parm.master_encblock.crypto_entry = krb5_des_cst_entry.system;
#else
server_parm.master_encblock.crypto_entry = &mit_des_cryptosystem_entry;
#endif /* KRB5B4 */
#else
error(You gotta figure out what cryptosystem to use in the KDC);
#endif
retval = krb5_db_setup_mkey_name(mkey_name, realm, (char **) 0,
&server_parm.master_princ);
if (retval)
return KADM_NO_MAST;
krb5_db_fetch_mkey(server_parm.master_princ,
&server_parm.master_encblock,
(inter == 1), FALSE, NULL,
&server_parm.master_keyblock);
if (retval)
return KADM_NO_MAST;
retval = krb5_db_verify_master_key(server_parm.master_princ,
&server_parm.master_keyblock,
&server_parm.master_encblock);
if (retval)
return KADM_NO_VERI;
retval = krb5_process_key(&server_parm.master_encblock,
&server_parm.master_keyblock);
if (retval)
return KADM_NO_VERI;
retval = krb5_db_get_principal(server_parm.master_princ,
&master_entry, &numfound, &more);
if (retval || more || !numfound)
return KADM_NO_VERI;
server_parm.max_life = master_entry.max_life;
server_parm.max_rlife = master_entry.max_renewable_life;
server_parm.expiration = master_entry.expiration;
server_parm.mkvno = master_entry.kvno;
/* don't set flags, as master has some extra restrictions
(??? quoted from kdb_edit.c) */
krb5_db_free_principal(&master_entry, numfound);
return KADM_SUCCESS;
}
static void errpkt(dat, dat_len, code)
u_char **dat;
int *dat_len;
int code;
{
krb4_uint32 retcode;
char *pdat;
free((char *)*dat); /* free up req */
*dat_len = KADM_VERSIZE + sizeof(krb4_uint32);
*dat = (u_char *) malloc((unsigned)*dat_len);
if (!(*dat)) {
syslog(LOG_ERR, "malloc(%d) returned null while in errpkt!", *dat_len);
abort();
}
pdat = (char *) *dat;
retcode = htonl((krb4_uint32) code);
(void) strncpy(pdat, KADM_ULOSE, KADM_VERSIZE);
memcpy(&pdat[KADM_VERSIZE], (char *)&retcode, sizeof(krb4_uint32));
return;
}
/*
kadm_ser_in
unwrap the data stored in dat, process, and return it.
*/
kadm_ser_in(dat,dat_len)
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 */
krb4_uint32 r_len; /* length of the actual packet */
KTEXT_ST authent; /* the authenticator */
AUTH_DAT ad; /* who is this, klink */
krb4_uint32 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(krb4_uint32);
memcpy((char *)authent.dat, (char *)(*dat) + in_len, 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() {memset((char *)sess_sched, 0, sizeof(sess_sched)); memset((char *)ad.session, 0, sizeof(ad.session));}
in_st = *dat + *dat_len - r_len;
#ifdef NOENCRYPTION
ncksum = 0;
#else
ncksum = quad_cksum((des_cblock *)in_st, (des_cblock *)0, (krb4_int32) r_len, 0,
(des_cblock *)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
memset(sess_sched, 0, 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;
#ifndef OVSEC_KADM
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;
case CHECK_PW:
retval = kadm_ser_ckpw(msg_st.app_data+1,(int) msg_st.app_length,&ad,
&retdat, &retlen);
break;
case CHG_STAB:
retval = kadm_ser_stab(msg_st.app_data+1,(int) msg_st.app_length,&ad,
&retdat, &retlen);
break;
#endif /* OVSEC_KADM */
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(krb4_uint32)));
if (!tmpdat) {
clr_cli_secrets();
syslog(LOG_ERR, "malloc(%d) returned null while in kadm_ser_in!",
retlen + KADM_VERSIZE + sizeof(krb4_uint32));
errpkt(dat, dat_len, KADM_NOMEM);
return KADM_NOMEM;
}
(void) strncpy((char *)tmpdat, KADM_VERSTR, KADM_VERSIZE);
retval = htonl((krb4_uint32)retval);
memcpy((char *)tmpdat + KADM_VERSIZE, (char *)&retval, sizeof(krb4_uint32));
if (retlen) {
memcpy((char *)tmpdat + KADM_VERSIZE + sizeof(krb4_uint32), (char *)retdat,
retlen);
free((char *)retdat);
}
/* slop for mk_priv stuff */
*dat = (u_char *) malloc((unsigned) (retlen + KADM_VERSIZE +
sizeof(krb4_uint32) + 200));
if ((*dat_len = krb_mk_priv(tmpdat, *dat,
(krb4_uint32) (retlen + KADM_VERSIZE +
sizeof(krb4_uint32)),
sess_sched,
ad.session, &server_parm.admin_addr,
&server_parm.recv_addr)) < 0) {
clr_cli_secrets();
errpkt(dat, dat_len, KADM_NO_ENCRYPT);
free(tmpdat);
return KADM_NO_ENCRYPT;
}
clr_cli_secrets();
free(tmpdat);
return KADM_SUCCESS;
}
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