several new kerberos related libraries and applications to FreeBSD: o kgetcred(1) allows one to manually get a ticket for a particular service. o kf(1) securily forwards ticket to another host through an authenticated and encrypted stream. o kcc(1) is an umbrella program around klist(1), kswitch(1), kgetcred(1) and other user kerberos operations. klist and kswitch are just symlinks to kcc(1) now. o kswitch(1) allows you to easily switch between kerberos credentials if you're running KCM. o hxtool(1) is a certificate management tool to use with PKINIT. o string2key(1) maps a password into key. o kdigest(8) is a userland tool to access the KDC's digest interface. o kimpersonate(8) creates a "fake" ticket for a service. We also now install manpages for some lirbaries that were not installed before, libheimntlm and libhx509. - The new HEIMDAL version no longer supports Kerberos 4. All users are recommended to switch to Kerberos 5. - Weak ciphers are now disabled by default. To enable DES support (used by telnet(8)), use "allow_weak_crypto" option in krb5.conf. - libtelnet, pam_ksu and pam_krb5 are now compiled with error on warnings disabled due to the function they use (krb5_get_err_text(3)) being deprecated. I plan to work on this next. - Heimdal's KDC now require sqlite to operate. We use the bundled version and install it as libheimsqlite. If some other FreeBSD components will require it in the future we can rename it to libbsdsqlite and use for these components as well. - This is not a latest Heimdal version, the new one was released while I was working on the update. I will update it to 1.5.2 soon, as it fixes some important bugs and security issues.
607 lines
15 KiB
C
607 lines
15 KiB
C
/*
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* Copyright (c) 2000 - 2004 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "hdb_locl.h"
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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struct hdb_master_key_data {
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krb5_keytab_entry keytab;
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krb5_crypto crypto;
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struct hdb_master_key_data *next;
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};
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void
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hdb_free_master_key(krb5_context context, hdb_master_key mkey)
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{
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struct hdb_master_key_data *ptr;
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while(mkey) {
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krb5_kt_free_entry(context, &mkey->keytab);
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if (mkey->crypto)
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krb5_crypto_destroy(context, mkey->crypto);
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ptr = mkey;
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mkey = mkey->next;
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free(ptr);
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}
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}
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krb5_error_code
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hdb_process_master_key(krb5_context context,
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int kvno, krb5_keyblock *key, krb5_enctype etype,
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hdb_master_key *mkey)
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{
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krb5_error_code ret;
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*mkey = calloc(1, sizeof(**mkey));
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if(*mkey == NULL) {
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krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
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return ENOMEM;
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}
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(*mkey)->keytab.vno = kvno;
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ret = krb5_parse_name(context, "K/M", &(*mkey)->keytab.principal);
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if(ret)
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goto fail;
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ret = krb5_copy_keyblock_contents(context, key, &(*mkey)->keytab.keyblock);
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if(ret)
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goto fail;
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if(etype != 0)
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(*mkey)->keytab.keyblock.keytype = etype;
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(*mkey)->keytab.timestamp = time(NULL);
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ret = krb5_crypto_init(context, key, etype, &(*mkey)->crypto);
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if(ret)
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goto fail;
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return 0;
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fail:
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hdb_free_master_key(context, *mkey);
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*mkey = NULL;
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return ret;
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}
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krb5_error_code
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hdb_add_master_key(krb5_context context, krb5_keyblock *key,
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hdb_master_key *inout)
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{
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int vno = 0;
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hdb_master_key p;
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krb5_error_code ret;
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for(p = *inout; p; p = p->next)
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vno = max(vno, p->keytab.vno);
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vno++;
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ret = hdb_process_master_key(context, vno, key, 0, &p);
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if(ret)
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return ret;
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p->next = *inout;
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*inout = p;
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return 0;
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}
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static krb5_error_code
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read_master_keytab(krb5_context context, const char *filename,
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hdb_master_key *mkey)
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{
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krb5_error_code ret;
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krb5_keytab id;
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krb5_kt_cursor cursor;
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krb5_keytab_entry entry;
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hdb_master_key p;
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ret = krb5_kt_resolve(context, filename, &id);
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if(ret)
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return ret;
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ret = krb5_kt_start_seq_get(context, id, &cursor);
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if(ret)
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goto out;
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*mkey = NULL;
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while(krb5_kt_next_entry(context, id, &entry, &cursor) == 0) {
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p = calloc(1, sizeof(*p));
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if(p == NULL) {
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krb5_kt_end_seq_get(context, id, &cursor);
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ret = ENOMEM;
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goto out;
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}
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p->keytab = entry;
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ret = krb5_crypto_init(context, &p->keytab.keyblock, 0, &p->crypto);
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p->next = *mkey;
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*mkey = p;
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}
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krb5_kt_end_seq_get(context, id, &cursor);
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out:
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krb5_kt_close(context, id);
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return ret;
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}
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/* read a MIT master keyfile */
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static krb5_error_code
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read_master_mit(krb5_context context, const char *filename,
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int byteorder, hdb_master_key *mkey)
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{
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int fd;
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krb5_error_code ret;
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krb5_storage *sp;
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int16_t enctype;
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krb5_keyblock key;
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fd = open(filename, O_RDONLY | O_BINARY);
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if(fd < 0) {
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int save_errno = errno;
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krb5_set_error_message(context, save_errno, "failed to open %s: %s",
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filename, strerror(save_errno));
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return save_errno;
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}
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sp = krb5_storage_from_fd(fd);
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if(sp == NULL) {
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close(fd);
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return errno;
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}
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krb5_storage_set_flags(sp, byteorder);
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/* could possibly use ret_keyblock here, but do it with more
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checks for now */
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{
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ret = krb5_ret_int16(sp, &enctype);
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if (ret)
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goto out;
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ret = krb5_enctype_valid(context, enctype);
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if (ret)
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goto out;
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key.keytype = enctype;
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ret = krb5_ret_data(sp, &key.keyvalue);
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if(ret)
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goto out;
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}
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ret = hdb_process_master_key(context, 1, &key, 0, mkey);
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krb5_free_keyblock_contents(context, &key);
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out:
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krb5_storage_free(sp);
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close(fd);
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return ret;
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}
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/* read an old master key file */
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static krb5_error_code
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read_master_encryptionkey(krb5_context context, const char *filename,
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hdb_master_key *mkey)
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{
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int fd;
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krb5_keyblock key;
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krb5_error_code ret;
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unsigned char buf[256];
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ssize_t len;
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size_t ret_len;
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fd = open(filename, O_RDONLY | O_BINARY);
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if(fd < 0) {
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int save_errno = errno;
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krb5_set_error_message(context, save_errno, "failed to open %s: %s",
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filename, strerror(save_errno));
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return save_errno;
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}
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len = read(fd, buf, sizeof(buf));
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close(fd);
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if(len < 0) {
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int save_errno = errno;
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krb5_set_error_message(context, save_errno, "error reading %s: %s",
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filename, strerror(save_errno));
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return save_errno;
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}
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ret = decode_EncryptionKey(buf, len, &key, &ret_len);
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memset(buf, 0, sizeof(buf));
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if(ret)
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return ret;
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/* Originally, the keytype was just that, and later it got changed
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to des-cbc-md5, but we always used des in cfb64 mode. This
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should cover all cases, but will break if someone has hacked
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this code to really use des-cbc-md5 -- but then that's not my
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problem. */
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if(key.keytype == ETYPE_DES_CBC_CRC || key.keytype == ETYPE_DES_CBC_MD5)
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key.keytype = ETYPE_DES_CFB64_NONE;
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ret = hdb_process_master_key(context, 0, &key, 0, mkey);
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krb5_free_keyblock_contents(context, &key);
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return ret;
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}
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/* read a krb4 /.k style file */
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static krb5_error_code
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read_master_krb4(krb5_context context, const char *filename,
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hdb_master_key *mkey)
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{
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int fd;
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krb5_keyblock key;
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krb5_error_code ret;
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unsigned char buf[256];
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ssize_t len;
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fd = open(filename, O_RDONLY | O_BINARY);
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if(fd < 0) {
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int save_errno = errno;
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krb5_set_error_message(context, save_errno, "failed to open %s: %s",
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filename, strerror(save_errno));
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return save_errno;
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}
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len = read(fd, buf, sizeof(buf));
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close(fd);
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if(len < 0) {
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int save_errno = errno;
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krb5_set_error_message(context, save_errno, "error reading %s: %s",
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filename, strerror(save_errno));
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return save_errno;
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}
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if(len != 8) {
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krb5_set_error_message(context, HEIM_ERR_EOF,
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"bad contents of %s", filename);
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return HEIM_ERR_EOF; /* XXX file might be too large */
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}
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memset(&key, 0, sizeof(key));
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key.keytype = ETYPE_DES_PCBC_NONE;
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ret = krb5_data_copy(&key.keyvalue, buf, len);
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memset(buf, 0, sizeof(buf));
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if(ret)
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return ret;
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ret = hdb_process_master_key(context, 0, &key, 0, mkey);
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krb5_free_keyblock_contents(context, &key);
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return ret;
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}
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krb5_error_code
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hdb_read_master_key(krb5_context context, const char *filename,
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hdb_master_key *mkey)
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{
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FILE *f;
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unsigned char buf[16];
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krb5_error_code ret;
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off_t len;
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*mkey = NULL;
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if(filename == NULL)
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filename = HDB_DB_DIR "/m-key";
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f = fopen(filename, "r");
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if(f == NULL) {
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int save_errno = errno;
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krb5_set_error_message(context, save_errno, "failed to open %s: %s",
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filename, strerror(save_errno));
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return save_errno;
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}
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if(fread(buf, 1, 2, f) != 2) {
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fclose(f);
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krb5_set_error_message(context, HEIM_ERR_EOF, "end of file reading %s", filename);
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return HEIM_ERR_EOF;
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}
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fseek(f, 0, SEEK_END);
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len = ftell(f);
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if(fclose(f) != 0)
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return errno;
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if(len < 0)
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return errno;
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if(len == 8) {
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ret = read_master_krb4(context, filename, mkey);
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} else if(buf[0] == 0x30 && len <= 127 && buf[1] == len - 2) {
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ret = read_master_encryptionkey(context, filename, mkey);
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} else if(buf[0] == 5 && buf[1] >= 1 && buf[1] <= 2) {
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ret = read_master_keytab(context, filename, mkey);
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} else {
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/*
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* Check both LittleEndian and BigEndian since they key file
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* might be moved from a machine with diffrent byte order, or
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* its running on MacOS X that always uses BE master keys.
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*/
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ret = read_master_mit(context, filename, KRB5_STORAGE_BYTEORDER_LE, mkey);
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if (ret)
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ret = read_master_mit(context, filename, KRB5_STORAGE_BYTEORDER_BE, mkey);
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}
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return ret;
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}
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krb5_error_code
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hdb_write_master_key(krb5_context context, const char *filename,
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hdb_master_key mkey)
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{
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krb5_error_code ret;
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hdb_master_key p;
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krb5_keytab kt;
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if(filename == NULL)
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filename = HDB_DB_DIR "/m-key";
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ret = krb5_kt_resolve(context, filename, &kt);
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if(ret)
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return ret;
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for(p = mkey; p; p = p->next) {
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ret = krb5_kt_add_entry(context, kt, &p->keytab);
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}
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krb5_kt_close(context, kt);
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return ret;
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}
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hdb_master_key
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_hdb_find_master_key(uint32_t *mkvno, hdb_master_key mkey)
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{
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hdb_master_key ret = NULL;
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while(mkey) {
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if(ret == NULL && mkey->keytab.vno == 0)
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ret = mkey;
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if(mkvno == NULL) {
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if(ret == NULL || mkey->keytab.vno > ret->keytab.vno)
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ret = mkey;
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} else if((uint32_t)mkey->keytab.vno == *mkvno)
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return mkey;
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mkey = mkey->next;
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}
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return ret;
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}
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int
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_hdb_mkey_version(hdb_master_key mkey)
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{
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return mkey->keytab.vno;
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}
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int
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_hdb_mkey_decrypt(krb5_context context, hdb_master_key key,
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krb5_key_usage usage,
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void *ptr, size_t size, krb5_data *res)
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{
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return krb5_decrypt(context, key->crypto, usage,
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ptr, size, res);
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}
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int
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_hdb_mkey_encrypt(krb5_context context, hdb_master_key key,
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krb5_key_usage usage,
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const void *ptr, size_t size, krb5_data *res)
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{
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return krb5_encrypt(context, key->crypto, usage,
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ptr, size, res);
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}
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krb5_error_code
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hdb_unseal_key_mkey(krb5_context context, Key *k, hdb_master_key mkey)
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{
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krb5_error_code ret;
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krb5_data res;
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size_t keysize;
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hdb_master_key key;
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if(k->mkvno == NULL)
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return 0;
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key = _hdb_find_master_key(k->mkvno, mkey);
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if (key == NULL)
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return HDB_ERR_NO_MKEY;
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ret = _hdb_mkey_decrypt(context, key, HDB_KU_MKEY,
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k->key.keyvalue.data,
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k->key.keyvalue.length,
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&res);
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if(ret == KRB5KRB_AP_ERR_BAD_INTEGRITY) {
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/* try to decrypt with MIT key usage */
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ret = _hdb_mkey_decrypt(context, key, 0,
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k->key.keyvalue.data,
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k->key.keyvalue.length,
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&res);
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}
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if (ret)
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return ret;
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/* fixup keylength if the key got padded when encrypting it */
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ret = krb5_enctype_keysize(context, k->key.keytype, &keysize);
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if (ret) {
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krb5_data_free(&res);
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return ret;
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}
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if (keysize > res.length) {
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krb5_data_free(&res);
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return KRB5_BAD_KEYSIZE;
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}
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memset(k->key.keyvalue.data, 0, k->key.keyvalue.length);
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free(k->key.keyvalue.data);
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k->key.keyvalue = res;
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k->key.keyvalue.length = keysize;
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free(k->mkvno);
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k->mkvno = NULL;
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return 0;
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}
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krb5_error_code
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hdb_unseal_keys_mkey(krb5_context context, hdb_entry *ent, hdb_master_key mkey)
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{
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size_t i;
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for(i = 0; i < ent->keys.len; i++){
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krb5_error_code ret;
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ret = hdb_unseal_key_mkey(context, &ent->keys.val[i], mkey);
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if (ret)
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return ret;
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}
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return 0;
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}
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krb5_error_code
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hdb_unseal_keys(krb5_context context, HDB *db, hdb_entry *ent)
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{
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if (db->hdb_master_key_set == 0)
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return 0;
|
|
return hdb_unseal_keys_mkey(context, ent, db->hdb_master_key);
|
|
}
|
|
|
|
krb5_error_code
|
|
hdb_unseal_key(krb5_context context, HDB *db, Key *k)
|
|
{
|
|
if (db->hdb_master_key_set == 0)
|
|
return 0;
|
|
return hdb_unseal_key_mkey(context, k, db->hdb_master_key);
|
|
}
|
|
|
|
krb5_error_code
|
|
hdb_seal_key_mkey(krb5_context context, Key *k, hdb_master_key mkey)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_data res;
|
|
hdb_master_key key;
|
|
|
|
if(k->mkvno != NULL)
|
|
return 0;
|
|
|
|
key = _hdb_find_master_key(k->mkvno, mkey);
|
|
|
|
if (key == NULL)
|
|
return HDB_ERR_NO_MKEY;
|
|
|
|
ret = _hdb_mkey_encrypt(context, key, HDB_KU_MKEY,
|
|
k->key.keyvalue.data,
|
|
k->key.keyvalue.length,
|
|
&res);
|
|
if (ret)
|
|
return ret;
|
|
|
|
memset(k->key.keyvalue.data, 0, k->key.keyvalue.length);
|
|
free(k->key.keyvalue.data);
|
|
k->key.keyvalue = res;
|
|
|
|
if (k->mkvno == NULL) {
|
|
k->mkvno = malloc(sizeof(*k->mkvno));
|
|
if (k->mkvno == NULL)
|
|
return ENOMEM;
|
|
}
|
|
*k->mkvno = key->keytab.vno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
krb5_error_code
|
|
hdb_seal_keys_mkey(krb5_context context, hdb_entry *ent, hdb_master_key mkey)
|
|
{
|
|
size_t i;
|
|
for(i = 0; i < ent->keys.len; i++){
|
|
krb5_error_code ret;
|
|
|
|
ret = hdb_seal_key_mkey(context, &ent->keys.val[i], mkey);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
krb5_error_code
|
|
hdb_seal_keys(krb5_context context, HDB *db, hdb_entry *ent)
|
|
{
|
|
if (db->hdb_master_key_set == 0)
|
|
return 0;
|
|
|
|
return hdb_seal_keys_mkey(context, ent, db->hdb_master_key);
|
|
}
|
|
|
|
krb5_error_code
|
|
hdb_seal_key(krb5_context context, HDB *db, Key *k)
|
|
{
|
|
if (db->hdb_master_key_set == 0)
|
|
return 0;
|
|
|
|
return hdb_seal_key_mkey(context, k, db->hdb_master_key);
|
|
}
|
|
|
|
krb5_error_code
|
|
hdb_set_master_key (krb5_context context,
|
|
HDB *db,
|
|
krb5_keyblock *key)
|
|
{
|
|
krb5_error_code ret;
|
|
hdb_master_key mkey;
|
|
|
|
ret = hdb_process_master_key(context, 0, key, 0, &mkey);
|
|
if (ret)
|
|
return ret;
|
|
db->hdb_master_key = mkey;
|
|
#if 0 /* XXX - why? */
|
|
des_set_random_generator_seed(key.keyvalue.data);
|
|
#endif
|
|
db->hdb_master_key_set = 1;
|
|
return 0;
|
|
}
|
|
|
|
krb5_error_code
|
|
hdb_set_master_keyfile (krb5_context context,
|
|
HDB *db,
|
|
const char *keyfile)
|
|
{
|
|
hdb_master_key key;
|
|
krb5_error_code ret;
|
|
|
|
ret = hdb_read_master_key(context, keyfile, &key);
|
|
if (ret) {
|
|
if (ret != ENOENT)
|
|
return ret;
|
|
krb5_clear_error_message(context);
|
|
return 0;
|
|
}
|
|
db->hdb_master_key = key;
|
|
db->hdb_master_key_set = 1;
|
|
return ret;
|
|
}
|
|
|
|
krb5_error_code
|
|
hdb_clear_master_key (krb5_context context,
|
|
HDB *db)
|
|
{
|
|
if (db->hdb_master_key_set) {
|
|
hdb_free_master_key(context, db->hdb_master_key);
|
|
db->hdb_master_key_set = 0;
|
|
}
|
|
return 0;
|
|
}
|