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https://github.com/freebsd/freebsd-src
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483 lines
12 KiB
C
483 lines
12 KiB
C
/*
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* Copyright (c) 1997 - 2002 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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RCSID("$Id: keytab.c,v 1.53 2002/03/10 23:14:12 assar Exp $");
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/*
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* Register a new keytab in `ops'
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* Return 0 or an error.
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*/
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krb5_error_code
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krb5_kt_register(krb5_context context,
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const krb5_kt_ops *ops)
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{
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struct krb5_keytab_data *tmp;
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tmp = realloc(context->kt_types,
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(context->num_kt_types + 1) * sizeof(*context->kt_types));
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if(tmp == NULL) {
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krb5_set_error_string(context, "malloc: out of memory");
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return ENOMEM;
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}
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memcpy(&tmp[context->num_kt_types], ops,
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sizeof(tmp[context->num_kt_types]));
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context->kt_types = tmp;
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context->num_kt_types++;
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return 0;
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}
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/*
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* Resolve the keytab name (of the form `type:residual') in `name'
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* into a keytab in `id'.
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* Return 0 or an error
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*/
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krb5_error_code
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krb5_kt_resolve(krb5_context context,
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const char *name,
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krb5_keytab *id)
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{
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krb5_keytab k;
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int i;
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const char *type, *residual;
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size_t type_len;
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krb5_error_code ret;
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residual = strchr(name, ':');
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if(residual == NULL) {
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type = "FILE";
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type_len = strlen(type);
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residual = name;
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} else {
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type = name;
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type_len = residual - name;
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residual++;
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}
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for(i = 0; i < context->num_kt_types; i++) {
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if(strncasecmp(type, context->kt_types[i].prefix, type_len) == 0)
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break;
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}
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if(i == context->num_kt_types) {
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krb5_set_error_string(context, "unknown keytab type %.*s",
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(int)type_len, type);
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return KRB5_KT_UNKNOWN_TYPE;
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}
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k = malloc (sizeof(*k));
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if (k == NULL) {
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krb5_set_error_string(context, "malloc: out of memory");
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return ENOMEM;
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}
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memcpy(k, &context->kt_types[i], sizeof(*k));
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k->data = NULL;
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ret = (*k->resolve)(context, residual, k);
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if(ret) {
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free(k);
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k = NULL;
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}
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*id = k;
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return ret;
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}
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/*
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* copy the name of the default keytab into `name'.
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* Return 0 or KRB5_CONFIG_NOTENUFSPACE if `namesize' is too short.
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*/
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krb5_error_code
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krb5_kt_default_name(krb5_context context, char *name, size_t namesize)
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{
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if (strlcpy (name, context->default_keytab, namesize) >= namesize) {
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krb5_clear_error_string (context);
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return KRB5_CONFIG_NOTENUFSPACE;
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}
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return 0;
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}
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/*
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* copy the name of the default modify keytab into `name'.
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* Return 0 or KRB5_CONFIG_NOTENUFSPACE if `namesize' is too short.
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*/
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krb5_error_code
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krb5_kt_default_modify_name(krb5_context context, char *name, size_t namesize)
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{
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const char *kt = NULL;
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if(context->default_keytab_modify == NULL) {
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if(strncasecmp(context->default_keytab, "ANY:", 4) != 0)
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kt = context->default_keytab;
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else {
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size_t len = strcspn(context->default_keytab + 4, ",");
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if(len >= namesize) {
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krb5_clear_error_string(context);
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return KRB5_CONFIG_NOTENUFSPACE;
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}
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strlcpy(name, context->default_keytab + 4, namesize);
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name[len] = '\0';
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return 0;
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}
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} else
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kt = context->default_keytab_modify;
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if (strlcpy (name, kt, namesize) >= namesize) {
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krb5_clear_error_string (context);
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return KRB5_CONFIG_NOTENUFSPACE;
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}
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return 0;
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}
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/*
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* Set `id' to the default keytab.
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* Return 0 or an error.
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*/
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krb5_error_code
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krb5_kt_default(krb5_context context, krb5_keytab *id)
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{
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return krb5_kt_resolve (context, context->default_keytab, id);
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}
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/*
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* Read the key identified by `(principal, vno, enctype)' from the
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* keytab in `keyprocarg' (the default if == NULL) into `*key'.
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* Return 0 or an error.
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*/
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krb5_error_code
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krb5_kt_read_service_key(krb5_context context,
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krb5_pointer keyprocarg,
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krb5_principal principal,
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krb5_kvno vno,
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krb5_enctype enctype,
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krb5_keyblock **key)
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{
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krb5_keytab keytab;
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krb5_keytab_entry entry;
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krb5_error_code ret;
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if (keyprocarg)
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ret = krb5_kt_resolve (context, keyprocarg, &keytab);
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else
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ret = krb5_kt_default (context, &keytab);
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if (ret)
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return ret;
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ret = krb5_kt_get_entry (context, keytab, principal, vno, enctype, &entry);
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krb5_kt_close (context, keytab);
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if (ret)
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return ret;
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ret = krb5_copy_keyblock (context, &entry.keyblock, key);
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krb5_kt_free_entry(context, &entry);
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return ret;
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}
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/*
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* Retrieve the name of the keytab `keytab' into `name', `namesize'
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* Return 0 or an error.
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*/
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krb5_error_code
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krb5_kt_get_name(krb5_context context,
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krb5_keytab keytab,
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char *name,
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size_t namesize)
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{
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return (*keytab->get_name)(context, keytab, name, namesize);
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}
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/*
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* Finish using the keytab in `id'. All resources will be released.
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* Return 0 or an error.
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*/
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krb5_error_code
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krb5_kt_close(krb5_context context,
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krb5_keytab id)
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{
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krb5_error_code ret;
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ret = (*id->close)(context, id);
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if(ret == 0)
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free(id);
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return ret;
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}
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/*
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* Compare `entry' against `principal, vno, enctype'.
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* Any of `principal, vno, enctype' might be 0 which acts as a wildcard.
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* Return TRUE if they compare the same, FALSE otherwise.
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*/
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krb5_boolean
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krb5_kt_compare(krb5_context context,
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krb5_keytab_entry *entry,
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krb5_const_principal principal,
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krb5_kvno vno,
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krb5_enctype enctype)
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{
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if(principal != NULL &&
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!krb5_principal_compare(context, entry->principal, principal))
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return FALSE;
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if(vno && vno != entry->vno)
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return FALSE;
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if(enctype && enctype != entry->keyblock.keytype)
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return FALSE;
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return TRUE;
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}
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/*
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* Retrieve the keytab entry for `principal, kvno, enctype' into `entry'
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* from the keytab `id'.
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* kvno == 0 is a wildcard and gives the keytab with the highest vno.
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* Return 0 or an error.
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*/
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krb5_error_code
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krb5_kt_get_entry(krb5_context context,
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krb5_keytab id,
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krb5_const_principal principal,
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krb5_kvno kvno,
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krb5_enctype enctype,
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krb5_keytab_entry *entry)
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{
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krb5_keytab_entry tmp;
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krb5_error_code ret;
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krb5_kt_cursor cursor;
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if(id->get)
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return (*id->get)(context, id, principal, kvno, enctype, entry);
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ret = krb5_kt_start_seq_get (context, id, &cursor);
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if (ret)
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return KRB5_KT_NOTFOUND; /* XXX i.e. file not found */
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entry->vno = 0;
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while (krb5_kt_next_entry(context, id, &tmp, &cursor) == 0) {
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if (krb5_kt_compare(context, &tmp, principal, 0, enctype)) {
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/* the file keytab might only store the lower 8 bits of
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the kvno, so only compare those bits */
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if (kvno == tmp.vno
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|| (tmp.vno < 256 && kvno % 256 == tmp.vno)) {
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krb5_kt_copy_entry_contents (context, &tmp, entry);
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krb5_kt_free_entry (context, &tmp);
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krb5_kt_end_seq_get(context, id, &cursor);
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return 0;
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} else if (kvno == 0 && tmp.vno > entry->vno) {
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if (entry->vno)
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krb5_kt_free_entry (context, entry);
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krb5_kt_copy_entry_contents (context, &tmp, entry);
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}
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}
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krb5_kt_free_entry(context, &tmp);
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}
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krb5_kt_end_seq_get (context, id, &cursor);
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if (entry->vno) {
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return 0;
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} else {
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char princ[256], kt_name[256];
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krb5_unparse_name_fixed (context, principal, princ, sizeof(princ));
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krb5_kt_get_name (context, id, kt_name, sizeof(kt_name));
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krb5_set_error_string (context,
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"failed to find %s%s%d%s in keytab %s",
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princ,
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kvno ? "(" : "",
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kvno,
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kvno ? ")" : "",
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kt_name);
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return KRB5_KT_NOTFOUND;
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}
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}
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/*
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* Copy the contents of `in' into `out'.
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* Return 0 or an error. */
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krb5_error_code
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krb5_kt_copy_entry_contents(krb5_context context,
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const krb5_keytab_entry *in,
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krb5_keytab_entry *out)
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{
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krb5_error_code ret;
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memset(out, 0, sizeof(*out));
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out->vno = in->vno;
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ret = krb5_copy_principal (context, in->principal, &out->principal);
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if (ret)
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goto fail;
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ret = krb5_copy_keyblock_contents (context,
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&in->keyblock,
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&out->keyblock);
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if (ret)
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goto fail;
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out->timestamp = in->timestamp;
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return 0;
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fail:
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krb5_kt_free_entry (context, out);
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return ret;
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}
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/*
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* Free the contents of `entry'.
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*/
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krb5_error_code
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krb5_kt_free_entry(krb5_context context,
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krb5_keytab_entry *entry)
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{
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krb5_free_principal (context, entry->principal);
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krb5_free_keyblock_contents (context, &entry->keyblock);
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return 0;
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}
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#if 0
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static int
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xxxlock(int fd, int write)
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{
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if(flock(fd, (write ? LOCK_EX : LOCK_SH) | LOCK_NB) < 0) {
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sleep(1);
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if(flock(fd, (write ? LOCK_EX : LOCK_SH) | LOCK_NB) < 0)
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return -1;
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}
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return 0;
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}
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static void
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xxxunlock(int fd)
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{
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flock(fd, LOCK_UN);
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}
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#endif
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/*
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* Set `cursor' to point at the beginning of `id'.
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* Return 0 or an error.
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*/
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krb5_error_code
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krb5_kt_start_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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if(id->start_seq_get == NULL) {
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krb5_set_error_string(context,
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"start_seq_get is not supported in the %s "
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" keytab", id->prefix);
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return HEIM_ERR_OPNOTSUPP;
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}
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return (*id->start_seq_get)(context, id, cursor);
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}
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/*
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* Get the next entry from `id' pointed to by `cursor' and advance the
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* `cursor'.
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* Return 0 or an error.
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*/
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krb5_error_code
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krb5_kt_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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if(id->next_entry == NULL) {
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krb5_set_error_string(context,
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"next_entry is not supported in the %s "
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" keytab", id->prefix);
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return HEIM_ERR_OPNOTSUPP;
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}
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return (*id->next_entry)(context, id, entry, cursor);
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}
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/*
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* Release all resources associated with `cursor'.
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*/
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krb5_error_code
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krb5_kt_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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if(id->end_seq_get == NULL) {
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krb5_set_error_string(context,
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"end_seq_get is not supported in the %s "
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" keytab", id->prefix);
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return HEIM_ERR_OPNOTSUPP;
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}
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return (*id->end_seq_get)(context, id, cursor);
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}
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/*
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* Add the entry in `entry' to the keytab `id'.
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* Return 0 or an error.
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*/
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krb5_error_code
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krb5_kt_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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if(id->add == NULL) {
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krb5_set_error_string(context, "Add is not supported in the %s keytab",
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id->prefix);
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return KRB5_KT_NOWRITE;
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}
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entry->timestamp = time(NULL);
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return (*id->add)(context, id,entry);
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}
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/*
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* Remove the entry `entry' from the keytab `id'.
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* Return 0 or an error.
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*/
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krb5_error_code
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krb5_kt_remove_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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if(id->remove == NULL) {
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krb5_set_error_string(context,
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"Remove is not supported in the %s keytab",
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id->prefix);
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return KRB5_KT_NOWRITE;
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}
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return (*id->remove)(context, id, entry);
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}
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