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.
469 lines
11 KiB
C
469 lines
11 KiB
C
/*
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* Copyright (c) 1997 - 2007 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 "krb5_locl.h"
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#ifndef HEIMDAL_SMALLER
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/* afs keyfile operations --------------------------------------- */
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/*
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* Minimum tools to handle the AFS KeyFile.
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*
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* Format of the KeyFile is:
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* <int32_t numkeys> {[<int32_t kvno> <char[8] deskey>] * numkeys}
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*
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* It just adds to the end of the keyfile, deleting isn't implemented.
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* Use your favorite text/hex editor to delete keys.
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*
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*/
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#define AFS_SERVERTHISCELL "/usr/afs/etc/ThisCell"
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#define AFS_SERVERMAGICKRBCONF "/usr/afs/etc/krb.conf"
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struct akf_data {
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uint32_t num_entries;
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char *filename;
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char *cell;
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char *realm;
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};
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/*
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* set `d->cell' and `d->realm'
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*/
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static int
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get_cell_and_realm (krb5_context context, struct akf_data *d)
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{
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FILE *f;
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char buf[BUFSIZ], *cp;
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int ret;
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f = fopen (AFS_SERVERTHISCELL, "r");
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if (f == NULL) {
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ret = errno;
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krb5_set_error_message (context, ret,
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N_("Open ThisCell %s: %s", ""),
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AFS_SERVERTHISCELL,
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strerror(ret));
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return ret;
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}
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if (fgets (buf, sizeof(buf), f) == NULL) {
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fclose (f);
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krb5_set_error_message (context, EINVAL,
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N_("No cell in ThisCell file %s", ""),
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AFS_SERVERTHISCELL);
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return EINVAL;
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}
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buf[strcspn(buf, "\n")] = '\0';
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fclose(f);
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d->cell = strdup (buf);
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if (d->cell == NULL) {
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krb5_set_error_message(context, ENOMEM,
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N_("malloc: out of memory", ""));
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return ENOMEM;
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}
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f = fopen (AFS_SERVERMAGICKRBCONF, "r");
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if (f != NULL) {
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if (fgets (buf, sizeof(buf), f) == NULL) {
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free (d->cell);
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d->cell = NULL;
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fclose (f);
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krb5_set_error_message (context, EINVAL,
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N_("No realm in ThisCell file %s", ""),
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AFS_SERVERMAGICKRBCONF);
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return EINVAL;
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}
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buf[strcspn(buf, "\n")] = '\0';
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fclose(f);
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}
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/* uppercase */
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for (cp = buf; *cp != '\0'; cp++)
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*cp = toupper((unsigned char)*cp);
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d->realm = strdup (buf);
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if (d->realm == NULL) {
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free (d->cell);
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d->cell = NULL;
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krb5_set_error_message(context, ENOMEM,
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N_("malloc: out of memory", ""));
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return ENOMEM;
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}
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return 0;
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}
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/*
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* init and get filename
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*/
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static krb5_error_code KRB5_CALLCONV
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akf_resolve(krb5_context context, const char *name, krb5_keytab id)
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{
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int ret;
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struct akf_data *d = malloc(sizeof (struct akf_data));
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if (d == NULL) {
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krb5_set_error_message(context, ENOMEM,
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N_("malloc: out of memory", ""));
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return ENOMEM;
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}
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d->num_entries = 0;
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ret = get_cell_and_realm (context, d);
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if (ret) {
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free (d);
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return ret;
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}
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d->filename = strdup (name);
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if (d->filename == NULL) {
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free (d->cell);
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free (d->realm);
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free (d);
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krb5_set_error_message(context, ENOMEM,
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N_("malloc: out of memory", ""));
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return ENOMEM;
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}
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id->data = d;
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return 0;
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}
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/*
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* cleanup
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*/
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static krb5_error_code KRB5_CALLCONV
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akf_close(krb5_context context, krb5_keytab id)
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{
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struct akf_data *d = id->data;
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free (d->filename);
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free (d->cell);
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free (d);
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return 0;
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}
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/*
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* Return filename
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*/
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static krb5_error_code KRB5_CALLCONV
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akf_get_name(krb5_context context,
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krb5_keytab id,
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char *name,
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size_t name_sz)
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{
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struct akf_data *d = id->data;
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strlcpy (name, d->filename, name_sz);
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return 0;
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}
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/*
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* Init
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*/
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static krb5_error_code KRB5_CALLCONV
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akf_start_seq_get(krb5_context context,
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krb5_keytab id,
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krb5_kt_cursor *c)
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{
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int32_t ret;
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struct akf_data *d = id->data;
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c->fd = open (d->filename, O_RDONLY | O_BINARY | O_CLOEXEC, 0600);
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if (c->fd < 0) {
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ret = errno;
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krb5_set_error_message(context, ret,
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N_("keytab afs keyfile open %s failed: %s", ""),
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d->filename, strerror(ret));
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return ret;
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}
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c->data = NULL;
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c->sp = krb5_storage_from_fd(c->fd);
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if (c->sp == NULL) {
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close(c->fd);
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krb5_clear_error_message (context);
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return KRB5_KT_NOTFOUND;
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}
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krb5_storage_set_eof_code(c->sp, KRB5_KT_END);
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ret = krb5_ret_uint32(c->sp, &d->num_entries);
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if(ret || d->num_entries > INT_MAX / 8) {
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krb5_storage_free(c->sp);
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close(c->fd);
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krb5_clear_error_message (context);
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if(ret == KRB5_KT_END)
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return KRB5_KT_NOTFOUND;
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return ret;
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}
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return 0;
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}
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static krb5_error_code KRB5_CALLCONV
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akf_next_entry(krb5_context context,
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krb5_keytab id,
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krb5_keytab_entry *entry,
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krb5_kt_cursor *cursor)
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{
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struct akf_data *d = id->data;
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int32_t kvno;
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off_t pos;
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int ret;
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pos = krb5_storage_seek(cursor->sp, 0, SEEK_CUR);
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if ((pos - 4) / (4 + 8) >= d->num_entries)
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return KRB5_KT_END;
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ret = krb5_make_principal (context, &entry->principal,
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d->realm, "afs", d->cell, NULL);
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if (ret)
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goto out;
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ret = krb5_ret_int32(cursor->sp, &kvno);
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if (ret) {
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krb5_free_principal (context, entry->principal);
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goto out;
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}
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entry->vno = kvno;
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if (cursor->data)
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entry->keyblock.keytype = ETYPE_DES_CBC_MD5;
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else
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entry->keyblock.keytype = ETYPE_DES_CBC_CRC;
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entry->keyblock.keyvalue.length = 8;
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entry->keyblock.keyvalue.data = malloc (8);
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if (entry->keyblock.keyvalue.data == NULL) {
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krb5_free_principal (context, entry->principal);
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krb5_set_error_message(context, ENOMEM,
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N_("malloc: out of memory", ""));
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ret = ENOMEM;
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goto out;
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}
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ret = krb5_storage_read(cursor->sp, entry->keyblock.keyvalue.data, 8);
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if(ret != 8)
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ret = (ret < 0) ? errno : KRB5_KT_END;
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else
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ret = 0;
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entry->timestamp = time(NULL);
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entry->flags = 0;
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entry->aliases = NULL;
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out:
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if (cursor->data) {
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krb5_storage_seek(cursor->sp, pos + 4 + 8, SEEK_SET);
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cursor->data = NULL;
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} else
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cursor->data = cursor;
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return ret;
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}
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static krb5_error_code KRB5_CALLCONV
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akf_end_seq_get(krb5_context context,
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krb5_keytab id,
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krb5_kt_cursor *cursor)
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{
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krb5_storage_free(cursor->sp);
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close(cursor->fd);
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cursor->data = NULL;
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return 0;
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}
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static krb5_error_code KRB5_CALLCONV
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akf_add_entry(krb5_context context,
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krb5_keytab id,
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krb5_keytab_entry *entry)
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{
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struct akf_data *d = id->data;
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int fd, created = 0;
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krb5_error_code ret;
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int32_t len;
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krb5_storage *sp;
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if (entry->keyblock.keyvalue.length != 8)
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return 0;
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switch(entry->keyblock.keytype) {
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case ETYPE_DES_CBC_CRC:
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case ETYPE_DES_CBC_MD4:
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case ETYPE_DES_CBC_MD5:
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break;
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default:
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return 0;
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}
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fd = open (d->filename, O_RDWR | O_BINARY | O_CLOEXEC);
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if (fd < 0) {
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fd = open (d->filename,
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O_RDWR | O_BINARY | O_CREAT | O_EXCL | O_CLOEXEC, 0600);
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if (fd < 0) {
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ret = errno;
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krb5_set_error_message(context, ret,
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N_("open keyfile(%s): %s", ""),
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d->filename,
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strerror(ret));
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return ret;
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}
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created = 1;
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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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krb5_set_error_message(context, ENOMEM,
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N_("malloc: out of memory", ""));
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return ENOMEM;
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}
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if (created)
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len = 0;
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else {
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if(krb5_storage_seek(sp, 0, SEEK_SET) < 0) {
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ret = errno;
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krb5_storage_free(sp);
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close(fd);
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krb5_set_error_message(context, ret,
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N_("seeking in keyfile: %s", ""),
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strerror(ret));
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return ret;
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}
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ret = krb5_ret_int32(sp, &len);
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if(ret) {
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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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}
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/*
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* Make sure we don't add the entry twice, assumes the DES
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* encryption types are all the same key.
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*/
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if (len > 0) {
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int32_t kvno;
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int i;
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for (i = 0; i < len; i++) {
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ret = krb5_ret_int32(sp, &kvno);
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if (ret) {
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krb5_set_error_message (context, ret,
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N_("Failed getting kvno from keyfile", ""));
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goto out;
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}
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if(krb5_storage_seek(sp, 8, SEEK_CUR) < 0) {
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ret = errno;
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krb5_set_error_message (context, ret,
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N_("Failed seeing in keyfile: %s", ""),
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strerror(ret));
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goto out;
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}
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if (kvno == entry->vno) {
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ret = 0;
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goto out;
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}
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}
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}
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len++;
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if(krb5_storage_seek(sp, 0, SEEK_SET) < 0) {
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ret = errno;
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krb5_set_error_message (context, ret,
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N_("Failed seeing in keyfile: %s", ""),
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strerror(ret));
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goto out;
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}
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ret = krb5_store_int32(sp, len);
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if(ret) {
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ret = errno;
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krb5_set_error_message (context, ret,
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N_("keytab keyfile failed new length", ""));
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return ret;
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}
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if(krb5_storage_seek(sp, (len - 1) * (8 + 4), SEEK_CUR) < 0) {
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ret = errno;
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krb5_set_error_message (context, ret,
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N_("seek to end: %s", ""), strerror(ret));
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goto out;
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}
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ret = krb5_store_int32(sp, entry->vno);
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if(ret) {
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krb5_set_error_message(context, ret,
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N_("keytab keyfile failed store kvno", ""));
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goto out;
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}
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ret = krb5_storage_write(sp, entry->keyblock.keyvalue.data,
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entry->keyblock.keyvalue.length);
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if(ret != entry->keyblock.keyvalue.length) {
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if (ret < 0)
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ret = errno;
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else
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ret = ENOTTY;
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krb5_set_error_message(context, ret,
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N_("keytab keyfile failed to add key", ""));
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goto out;
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}
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ret = 0;
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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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const krb5_kt_ops krb5_akf_ops = {
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"AFSKEYFILE",
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akf_resolve,
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akf_get_name,
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akf_close,
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NULL, /* destroy */
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NULL, /* get */
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akf_start_seq_get,
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akf_next_entry,
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akf_end_seq_get,
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akf_add_entry,
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NULL /* remove */
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};
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#endif /* HEIMDAL_SMALLER */
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