server_kdb.c   [plain text]

/*
 * Copyright 1993 OpenVision Technologies, Inc., All Rights Reserved
 *
 * $Header: /cvs/krbdev/krb5/src/lib/kadm5/srv/server_kdb.c,v 1.3.4.1 2003/06/14 00:34:29 tlyu Exp $
 */

#if !defined(lint) && !defined(__CODECENTER__)
static char *rcsid = "$Header: /cvs/krbdev/krb5/src/lib/kadm5/srv/server_kdb.c,v 1.3.4.1 2003/06/14 00:34:29 tlyu Exp $";
#endif

#include <stdio.h>
#include <stdlib.h>
#include "k5-int.h"
#include <kadm5/admin.h>
#include "server_internal.h"

krb5_principal	    master_princ;
krb5_keyblock	    master_keyblock;
krb5_db_entry	    master_db;

krb5_principal	    hist_princ;
krb5_keyblock	    hist_key;
krb5_db_entry	    hist_db;
krb5_kvno	    hist_kvno;

/* much of this code is stolen from the kdc.  there should be some
   library code to deal with this. */

krb5_error_code kdb_init_master(kadm5_server_handle_t handle,
				char *r, int from_keyboard)
{
    int		   ret = 0;
    char	   *realm;
    krb5_boolean   from_kbd = FALSE;

    if (from_keyboard)
      from_kbd = TRUE;

    if (r == NULL)  {
	if ((ret = krb5_get_default_realm(handle->context, &realm)))
	    return ret;
    } else {
	realm = r;
    }
	    
    if ((ret = krb5_db_setup_mkey_name(handle->context,
				       handle->params.mkey_name,
				       realm, NULL, &master_princ)))
	goto done;

    master_keyblock.enctype = handle->params.enctype;

    ret = krb5_db_fetch_mkey(handle->context, master_princ,
			     master_keyblock.enctype, from_kbd,
			     FALSE /* only prompt once */,
			     handle->params.stash_file,
			     NULL /* I'm not sure about this,
				     but it's what the kdc does --marc */,
			     &master_keyblock);
    if (ret)
	goto done;
				 
    if ((ret = krb5_db_init(handle->context)) != KSUCCESS)
	goto done;

    if ((ret = krb5_db_verify_master_key(handle->context, master_princ,
					 &master_keyblock))) {
	  krb5_db_fini(handle->context);
	  return ret;
    }

done:
    if (r == NULL)
	free(realm);

    return(ret);
}

/*
 * Function: kdb_init_hist
 *
 * Purpose: Initializes the global history variables.
 *
 * Arguments:
 *
 *	handle		(r) kadm5 api server handle
 *	r		(r) realm of history principal to use, or NULL
 *
 * Effects: This function sets the value of the following global
 * variables:
 *
 *	hist_princ	krb5_principal holding the history principal
 *	hist_db		krb5_db_entry of the history principal
 *	hist_key	krb5_keyblock holding the history principal's key
 *	hist_encblock	krb5_encrypt_block holding the procssed hist_key
 *	hist_kvno	the version number of the history key
 *
 * If the history principal does not already exist, this function
 * attempts to create it with kadm5_create_principal.  WARNING!
 * If the history principal is deleted and this function is executed
 * (by kadmind, or kadmin.local, or anything else with permission),
 * the principal will be assigned a new random key and all existing
 * password history information will become useless.
 */
krb5_error_code kdb_init_hist(kadm5_server_handle_t handle, char *r)
{
    int	    ret = 0;
    char    *realm, *hist_name;
    krb5_key_data *key_data;
    krb5_key_salt_tuple ks[1];

    if (r == NULL)  {
	if ((ret = krb5_get_default_realm(handle->context, &realm)))
	    return ret;
    } else {
	realm = r;
    }

    if ((hist_name = (char *) malloc(strlen(KADM5_HIST_PRINCIPAL) +
				     strlen(realm) + 2)) == NULL)
	goto done;

    (void) sprintf(hist_name, "%s@%s", KADM5_HIST_PRINCIPAL, realm);

    if ((ret = krb5_parse_name(handle->context, hist_name, &hist_princ)))
	goto done;

    if ((ret = kdb_get_entry(handle, hist_princ, &hist_db, NULL))) {
	kadm5_principal_ent_rec ent;

	if (ret != KADM5_UNK_PRINC)
	    goto done;

	/* try to create the principal */

	memset(&ent, 0, sizeof(ent));

	ent.principal = hist_princ;
	ent.max_life = KRB5_KDB_DISALLOW_ALL_TIX;
	ent.attributes = 0;

	/* this uses hist_kvno.  So we set it to 2, which will be the
	   correct value once the principal is created and randomized.
	   Of course, it doesn't make sense to keep a history for the
	   history principal, anyway. */

	hist_kvno = 2;
	ks[0].ks_enctype = handle->params.enctype;
	ks[0].ks_salttype = KRB5_KDB_SALTTYPE_NORMAL;
	ret = kadm5_create_principal_3(handle, &ent,
				       (KADM5_PRINCIPAL | KADM5_MAX_LIFE |
					KADM5_ATTRIBUTES),
				       1, ks,
				       "to-be-random");
	if (ret)
	    goto done;

	/* this won't let us randomize the hist_princ.  So we cheat. */

	hist_princ = NULL;

	ret = kadm5_randkey_principal_3(handle, ent.principal, 0, 1, ks,
					NULL, NULL);

	hist_princ = ent.principal;

	if (ret)
	    goto done;

	/* now read the newly-created kdb record out of the
	   database. */

	if ((ret = kdb_get_entry(handle, hist_princ, &hist_db, NULL)))
	    goto done;

    }

    ret = krb5_dbe_find_enctype(handle->context, &hist_db,
				handle->params.enctype, -1, -1, &key_data);
    if (ret)
	goto done;

    ret = krb5_dbekd_decrypt_key_data(handle->context, &master_keyblock,
				  key_data, &hist_key, NULL);
    if (ret)
	goto done;

    hist_kvno = key_data->key_data_kvno;

done:
    free(hist_name);
    if (r == NULL)
	free(realm);
    return ret;
}

/*
 * Function: kdb_get_entry
 *
 * Purpose: Gets an entry from the kerberos database and breaks
 * it out into a krb5_db_entry and an osa_princ_ent_t.
 *
 * Arguments:
 *
 *		handle		(r) the server_handle
 * 		principal	(r) the principal to get
 * 		kdb		(w) krb5_db_entry to fill in
 * 		adb		(w) osa_princ_ent_rec to fill in
 *
 * when the caller is done with kdb and adb, kdb_free_entry must be
 * called to release them.  The adb record is filled in with the
 * contents of the KRB5_TL_KADM_DATA record; if that record doesn't
 * exist, an empty but valid adb record is returned.
 */
krb5_error_code
kdb_get_entry(kadm5_server_handle_t handle,
	      krb5_principal principal, krb5_db_entry *kdb,
	      osa_princ_ent_rec *adb)
{
    krb5_error_code ret;
    int nprincs;
    krb5_boolean more;
    krb5_tl_data tl_data;
    XDR xdrs;

    ret = krb5_db_get_principal(handle->context, principal, kdb, &nprincs,
				&more);
    if (ret)
	return(ret);

    if (more) {
	krb5_db_free_principal(handle->context, kdb, nprincs);
	return(KRB5KDC_ERR_PRINCIPAL_NOT_UNIQUE);
    } else if (nprincs != 1) {
	krb5_db_free_principal(handle->context, kdb, nprincs);
	return(KADM5_UNK_PRINC);
    }

    if (adb) {
	memset(adb, 0, sizeof(*adb));

	tl_data.tl_data_type = KRB5_TL_KADM_DATA;
	/*
	 * XXX Currently, lookup_tl_data always returns zero; it sets
	 * tl_data->tl_data_length to zero if the type isn't found.
	 * This should be fixed...
	 */
	if ((ret = krb5_dbe_lookup_tl_data(handle->context, kdb, &tl_data))
	    || (tl_data.tl_data_length == 0)) {
	    /* there's no admin data.  this can happen, if the admin
	       server is put into production after some principals
	       are created.  In this case, return valid admin
	       data (which is all zeros with the hist_kvno filled
	       in), and when the entry is written, the admin
	       data will get stored correctly. */

	    adb->admin_history_kvno = hist_kvno;

	    return(ret);
	}

	xdrmem_create(&xdrs, tl_data.tl_data_contents,
		      tl_data.tl_data_length, XDR_DECODE);
	if (! xdr_osa_princ_ent_rec(&xdrs, adb)) {
	   xdr_destroy(&xdrs);
	   krb5_db_free_principal(handle->context, kdb, 1);
	   return(OSA_ADB_XDR_FAILURE);
	}
	xdr_destroy(&xdrs);
    }

    return(0);
}

/*
 * Function: kdb_free_entry
 *
 * Purpose: frees the resources allocated by kdb_get_entry
 *
 * Arguments:
 *
 *		handle		(r) the server_handle
 * 		kdb		(w) krb5_db_entry to fill in
 * 		adb		(w) osa_princ_ent_rec to fill in
 *
 * when the caller is done with kdb and adb, kdb_free_entry must be
 * called to release them.
 */

krb5_error_code
kdb_free_entry(kadm5_server_handle_t handle,
	       krb5_db_entry *kdb, osa_princ_ent_rec *adb)
{
    XDR xdrs;


    if (kdb)
	krb5_db_free_principal(handle->context, kdb, 1);

    if (adb) {
	xdrmem_create(&xdrs, NULL, 0, XDR_FREE);
	xdr_osa_princ_ent_rec(&xdrs, adb);
	xdr_destroy(&xdrs);
    }

    return(0);
}

/*
 * Function: kdb_put_entry
 *
 * Purpose: Stores the osa_princ_ent_t and krb5_db_entry into to
 * database.
 *
 * Arguments:
 *
 *		handle	(r) the server_handle
 * 		kdb	(r/w) the krb5_db_entry to store
 * 		adb	(r) the osa_princ_db_ent to store
 *
 * Effects:
 *
 * The last modifier field of the kdb is set to the caller at now.
 * adb is encoded with xdr_osa_princ_ent_ret and stored in kbd as
 * KRB5_TL_KADM_DATA.  kdb is then written to the database.
 */
krb5_error_code
kdb_put_entry(kadm5_server_handle_t handle,
	      krb5_db_entry *kdb, osa_princ_ent_rec *adb)
{
    krb5_error_code ret;
    krb5_int32 now;
    XDR xdrs;
    krb5_tl_data tl_data;
    int one;

    ret = krb5_timeofday(handle->context, &now);
    if (ret)
	return(ret);

    ret = krb5_dbe_update_mod_princ_data(handle->context, kdb, now,
					 handle->current_caller);
    if (ret)
	return(ret);
    
    xdralloc_create(&xdrs, XDR_ENCODE); 
    if(! xdr_osa_princ_ent_rec(&xdrs, adb)) {
	xdr_destroy(&xdrs);
	return(OSA_ADB_XDR_FAILURE);
    }
    tl_data.tl_data_type = KRB5_TL_KADM_DATA;
    tl_data.tl_data_length = xdr_getpos(&xdrs);
    tl_data.tl_data_contents = xdralloc_getdata(&xdrs);

    ret = krb5_dbe_update_tl_data(handle->context, kdb, &tl_data);

    xdr_destroy(&xdrs);

    if (ret)
	return(ret);

    one = 1;

    ret = krb5_db_put_principal(handle->context, kdb, &one);
    if (ret)
	return(ret);

    return(0);
}

krb5_error_code
kdb_delete_entry(kadm5_server_handle_t handle, krb5_principal name)
{
    int one = 1;
    krb5_error_code ret;
    
    ret = krb5_db_delete_principal(handle->context, name, &one);

    return ret;
}

typedef struct _iter_data {
    void (*func)(void *, krb5_principal);
    void *data;
} iter_data;

static krb5_error_code
kdb_iter_func(krb5_pointer data, krb5_db_entry *kdb)
{
    iter_data *id = (iter_data *) data;

    (*(id->func))(id->data, kdb->princ);

    return(0);
}

krb5_error_code
kdb_iter_entry(kadm5_server_handle_t handle,
	       void (*iter_fct)(void *, krb5_principal), void *data)
{
    iter_data id;
    krb5_error_code ret;

    id.func = iter_fct;
    id.data = data;

    ret = krb5_db_iterate(handle->context, kdb_iter_func, &id);
    if (ret)
	return(ret);

    return(0);
}