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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* kprop/kprop_util.c */
/*
* Copyright (C) 2010 by the Massachusetts Institute of Technology.
* All rights reserved.
*
* Export of this software from the United States of America may
* 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. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* 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.
*/
/* sockaddr2krbaddr() utility function used by kprop and kpropd */
#include "k5-int.h"
#include "kprop.h"
#include <sys/types.h>
#include <sys/socket.h>
/*
* Convert an IPv4 or IPv6 socket address to a newly allocated krb5_address.
* There is similar code elsewhere in the tree, so this should possibly become
* a libkrb5 API in the future.
*/
krb5_error_code
sockaddr2krbaddr(krb5_context context, int family, struct sockaddr *sa,
krb5_address **dest)
{
krb5_address addr;
addr.magic = KV5M_ADDRESS;
if (family == AF_INET) {
struct sockaddr_in *sa4 = sa2sin(sa);
addr.addrtype = ADDRTYPE_INET;
addr.length = sizeof(sa4->sin_addr);
addr.contents = (krb5_octet *) &sa4->sin_addr;
} else if (family == AF_INET6) {
struct sockaddr_in6 *sa6 = sa2sin6(sa);
if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) {
addr.addrtype = ADDRTYPE_INET;
addr.contents = (krb5_octet *) &sa6->sin6_addr + 12;
addr.length = 4;
} else {
addr.addrtype = ADDRTYPE_INET6;
addr.length = sizeof(sa6->sin6_addr);
addr.contents = (krb5_octet *) &sa6->sin6_addr;
}
} else
return KRB5_PROG_ATYPE_NOSUPP;
return krb5_copy_addr(context, &addr, dest);
}
/* Construct a host-based principal, similar to krb5_sname_to_principal() but
* with a specified realm. */
krb5_error_code
sn2princ_realm(krb5_context context, const char *hostname, const char *sname,
const char *realm, krb5_principal *princ_out)
{
krb5_error_code ret;
krb5_principal princ;
*princ_out = NULL;
assert(sname != NULL && realm != NULL);
ret = krb5_sname_to_principal(context, hostname, sname, KRB5_NT_SRV_HST,
&princ);
if (ret)
return ret;
ret = krb5_set_principal_realm(context, princ, realm);
if (ret) {
krb5_free_principal(context, princ);
return ret;
}
*princ_out = princ;
return 0;
}
void
encode_database_size(uint64_t size, krb5_data *buf)
{
assert(buf->length >= 12);
if (size > 0 && size <= UINT32_MAX) {
/* Encode in 32 bits for backward compatibility. */
store_32_be(size, buf->data);
buf->length = 4;
} else {
/* Set the first 32 bits to 0 and encode in the following 64 bits. */
store_32_be(0, buf->data);
store_64_be(size, buf->data + 4);
buf->length = 12;
}
}
krb5_error_code
decode_database_size(const krb5_data *buf, uint64_t *size_out)
{
uint64_t size;
if (buf->length == 12) {
/* A 12-byte buffer must have the first four bytes zeroed. */
if (load_32_be(buf->data) != 0)
return KRB5KRB_ERR_GENERIC;
/* The size is stored in the next 64 bits. Values from 1..2^32-1 must
* be encoded in four bytes. */
size = load_64_be(buf->data + 4);
if (size > 0 && size <= UINT32_MAX)
return KRB5KRB_ERR_GENERIC;
} else if (buf->length == 4) {
size = load_32_be(buf->data);
} else {
/* Invalid buffer size. */
return KRB5KRB_ERR_GENERIC;
}
*size_out = size;
return 0;
}
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