/*
 * Copyright (c) 2005 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden).
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Check database for strange configurations on default principals
 */

#include "kadmin_locl.h"
#include "kadmin-commands.h"

static int
get_check_entry(const char *name, kadm5_principal_ent_rec *ent)
{
    krb5_error_code ret;
    krb5_principal principal;

    ret = krb5_parse_name(context, name, &principal);
    if (ret) {
	krb5_warn(context, ret, "krb5_unparse_name: %s", name);
	return 1;
    }

    memset(ent, 0, sizeof(*ent));
    ret = kadm5_get_principal(kadm_handle, principal, ent, KADM5_ATTRIBUTES);
    krb5_free_principal(context, principal);
    if(ret)
	return 1;

    return 0;
}


static int
do_check_entry(krb5_principal principal, void *data)
{
    krb5_error_code ret;
    kadm5_principal_ent_rec princ;
    char *name;
    int i;

    ret = krb5_unparse_name(context, principal, &name);
    if (ret)
	return 1;

    memset (&princ, 0, sizeof(princ));
    ret = kadm5_get_principal(data, principal, &princ,
			      KADM5_PRINCIPAL | KADM5_KEY_DATA);
    if(ret) {
	krb5_warn(context, ret, "Failed to get principal: %s", name);
	free(name);
	return 0;
    }

    for (i = 0; i < princ.n_key_data; i++) {
	size_t keysize;
	ret = krb5_enctype_keysize(context,
				   princ.key_data[i].key_data_type[0],
				   &keysize);
	if (ret == 0 && keysize != (size_t)princ.key_data[i].key_data_length[0]) {
	    krb5_warnx(context,
		       "Principal %s enctype %d, wrong length: %d\n",
		       name, princ.key_data[i].key_data_type[0],
		       princ.key_data[i].key_data_length[0]);
	}
    }

    free(name);
    kadm5_free_principal_ent(data, &princ);

    return 0;
}

int
check(void *opt, int argc, char **argv)
{
    kadm5_principal_ent_rec ent;
    krb5_error_code ret;
    char *realm = NULL, *p, *p2;
    void *inner_kadm_handle = NULL;
    int found;

    if (argc == 0) {
	ret = krb5_get_default_realm(context, &realm);
	if (ret) {
	    krb5_warn(context, ret, "krb5_get_default_realm");
	    goto fail;
	}
    } else {
	realm = strdup(argv[0]);
	if (realm == NULL) {
	    krb5_warnx(context, "malloc");
	    goto fail;
	}
    }

    /*
     * Check krbtgt/REALM@REALM
     *
     * For now, just check existance
     */

    if (asprintf(&p, "%s/%s@%s", KRB5_TGS_NAME, realm, realm) == -1) {
	krb5_warn(context, errno, "asprintf");
	goto fail;
    }

    ret = get_check_entry(p, &ent);
    if (ret) {
	fprintf(stderr,
	        "%s does not exist, are you sure %s is a realm in your database?\n",
	        p, realm);
	free(p);
	goto fail;
    }
    free(p);

    kadm5_free_principal_ent(kadm_handle, &ent);

    /*
     * Check kadmin/admin@REALM
     */

    if (asprintf(&p, "kadmin/admin@%s", realm) == -1) {
	krb5_warn(context, errno, "asprintf");
	goto fail;
    }

    ret = get_check_entry(p, &ent);
    if (ret) {
	fprintf(stderr,
	        "%s does not exist, there is no way to do remote administration.\n",
	        p);
	free(p);
	goto fail;
    }
    free(p);

    kadm5_free_principal_ent(kadm_handle, &ent);

    /*
     * Check kadmin/changepw@REALM
     */

    if (asprintf(&p, "kadmin/changepw@%s", realm) == -1) {
	krb5_warn(context, errno, "asprintf");
	goto fail;
    }

    ret = get_check_entry(p, &ent);
    if (ret) {
	fprintf(stderr,
	        "%s does not exist, there is no way to do change password.\n",
	        p);
	free(p);
	goto fail;
    }
    free(p);

    kadm5_free_principal_ent(kadm_handle, &ent);

    /*
     * Check default@REALM
     *
     * Check that disallow-all-tix is set on the default principal
     * (or that the entry does not exist)
     */

    if (asprintf(&p, "default@%s", realm) == -1) {
	krb5_warn(context, errno, "asprintf");
	goto fail;
    }

    ret = get_check_entry(p, &ent);
    if (ret == 0) {
	if ((ent.attributes & KRB5_KDB_DISALLOW_ALL_TIX) == 0) {
	    fprintf(stderr, "default template entry is not disabled\n");
	    ret = EINVAL;
	}
	kadm5_free_principal_ent(kadm_handle, &ent);

    } else {
	ret = 0;
    }

    free(p);

    if (ret)
	goto fail;

    /*
     * Check for duplicate afs keys
     */

    p2 = strdup(realm);
    if (p2 == NULL) {
	krb5_warn(context, errno, "malloc");
	goto fail;
    }
    strlwr(p2);

    if (asprintf(&p, "afs/%s@%s", p2, realm) == -1) {
	krb5_warn(context, errno, "asprintf");
	free(p2);
	goto fail;
    }
    free(p2);

    ret = get_check_entry(p, &ent);
    free(p);
    if (ret == 0) {
	kadm5_free_principal_ent(kadm_handle, &ent);
	found = 1;
    } else
	found = 0;

    if (asprintf(&p, "afs@%s", realm) == -1) {
	krb5_warn(context, errno, "asprintf");
	goto fail;
    }

    ret = get_check_entry(p, &ent);
    free(p);
    if (ret == 0) {
	kadm5_free_principal_ent(kadm_handle, &ent);
	if (found) {
	    krb5_warnx(context, "afs@REALM and afs/cellname@REALM both exists");
	    goto fail;
	}
    }

    ret = kadm5_dup_context(kadm_handle, &inner_kadm_handle);
    if (ret == 0)
        ret = foreach_principal("*", do_check_entry, "check", inner_kadm_handle);
    if (inner_kadm_handle)
        kadm5_destroy(inner_kadm_handle);
    if (ret) {
        krb5_warn(context, ret, "Could not iterate principals in realm");
        goto fail;
    }

    free(realm);
    return 0;
fail:
    free(realm);
    return 1;
}
