457 lines
10 KiB
C
457 lines
10 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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return krb5_enomem(context);
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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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return krb5_enomem(context);
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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 = calloc(1, sizeof (struct akf_data));
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if (d == NULL)
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return krb5_enomem(context);
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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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return krb5_enomem(context);
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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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ret = krb5_enomem(context);
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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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return krb5_enomem(context);
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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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NULL,
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0
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};
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#endif /* HEIMDAL_SMALLER */
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