459 lines
12 KiB
C
459 lines
12 KiB
C
/*
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* Copyright (c) 1997 - 1999, 2002 - 2003 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 <string.h>
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#include "krb5_locl.h"
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#include "an2ln_plugin.h"
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#include "db_plugin.h"
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/* Default plugin (DB using binary search of sorted text file) follows */
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static krb5_error_code KRB5_LIB_CALL an2ln_def_plug_init(krb5_context, void **);
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static void KRB5_LIB_CALL an2ln_def_plug_fini(void *);
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static krb5_error_code KRB5_LIB_CALL an2ln_def_plug_an2ln(void *, krb5_context, const char *,
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krb5_const_principal, set_result_f,
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void *);
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static krb5plugin_an2ln_ftable an2ln_def_plug = {
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0,
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an2ln_def_plug_init,
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an2ln_def_plug_fini,
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an2ln_def_plug_an2ln,
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};
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/* Plugin engine code follows */
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struct plctx {
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krb5_const_principal aname;
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heim_string_t luser;
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const char *rule;
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};
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static krb5_error_code KRB5_LIB_CALL
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set_res(void *userctx, const char *res)
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{
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struct plctx *plctx = userctx;
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plctx->luser = heim_string_create(res);
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if (plctx->luser == NULL)
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return ENOMEM;
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return 0;
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}
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static krb5_error_code KRB5_LIB_CALL
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plcallback(krb5_context context,
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const void *plug, void *plugctx, void *userctx)
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{
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const krb5plugin_an2ln_ftable *locate = plug;
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struct plctx *plctx = userctx;
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if (plctx->luser)
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return 0;
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return locate->an2ln(plugctx, context, plctx->rule, plctx->aname, set_res, plctx);
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}
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static krb5_error_code
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an2ln_plugin(krb5_context context, const char *rule, krb5_const_principal aname,
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size_t lnsize, char *lname)
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{
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krb5_error_code ret;
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struct plctx ctx;
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ctx.rule = rule;
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ctx.aname = aname;
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ctx.luser = NULL;
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/*
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* Order of plugin invocation is non-deterministic, but there should
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* really be no more than one plugin that can handle any given kind
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* rule, so the effect should be deterministic anyways.
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*/
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ret = _krb5_plugin_run_f(context, "krb5", KRB5_PLUGIN_AN2LN,
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KRB5_PLUGIN_AN2LN_VERSION_0, 0, &ctx, plcallback);
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if (ret != 0) {
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heim_release(ctx.luser);
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return ret;
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}
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if (ctx.luser == NULL)
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return KRB5_PLUGIN_NO_HANDLE;
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if (strlcpy(lname, heim_string_get_utf8(ctx.luser), lnsize) >= lnsize)
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ret = KRB5_CONFIG_NOTENUFSPACE;
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heim_release(ctx.luser);
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return ret;
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}
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static void
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reg_def_plugins_once(void *ctx)
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{
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krb5_context context = ctx;
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krb5_plugin_register(context, PLUGIN_TYPE_DATA, KRB5_PLUGIN_AN2LN,
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&an2ln_def_plug);
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}
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static int
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princ_realm_is_default(krb5_context context,
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krb5_const_principal aname)
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{
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krb5_error_code ret;
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krb5_realm *lrealms = NULL;
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krb5_realm *r;
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int valid;
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ret = krb5_get_default_realms(context, &lrealms);
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if (ret)
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return 0;
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valid = 0;
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for (r = lrealms; *r != NULL; ++r) {
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if (strcmp (*r, aname->realm) == 0) {
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valid = 1;
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break;
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}
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}
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krb5_free_host_realm (context, lrealms);
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return valid;
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}
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/*
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* This function implements MIT's auth_to_local_names configuration for
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* configuration compatibility. Specifically:
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*
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* [realms]
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* <realm-name> = {
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* auth_to_local_names = {
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* <unparsed-principal-name> = <username>
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* }
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* }
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*
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* If multiple usernames are configured then the last one is taken.
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*
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* The configuration can only be expected to hold a relatively small
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* number of mappings. For lots of mappings use a DB.
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*/
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static krb5_error_code
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an2ln_local_names(krb5_context context,
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krb5_const_principal aname,
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size_t lnsize,
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char *lname)
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{
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krb5_error_code ret;
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char *unparsed;
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char **values;
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char *res;
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size_t i;
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if (!princ_realm_is_default(context, aname))
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return KRB5_PLUGIN_NO_HANDLE;
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ret = krb5_unparse_name_flags(context, aname,
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KRB5_PRINCIPAL_UNPARSE_NO_REALM,
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&unparsed);
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if (ret)
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return ret;
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ret = KRB5_PLUGIN_NO_HANDLE;
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values = krb5_config_get_strings(context, NULL, "realms", aname->realm,
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"auth_to_local_names", unparsed, NULL);
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free(unparsed);
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if (!values)
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return ret;
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/* Take the last value, just like MIT */
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for (res = NULL, i = 0; values[i]; i++)
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res = values[i];
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if (res) {
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ret = 0;
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if (strlcpy(lname, res, lnsize) >= lnsize)
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ret = KRB5_CONFIG_NOTENUFSPACE;
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if (!*res || strcmp(res, ":") == 0)
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ret = KRB5_NO_LOCALNAME;
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}
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krb5_config_free_strings(values);
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return ret;
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}
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/*
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* Heimdal's default aname2lname mapping.
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*/
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static krb5_error_code
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an2ln_default(krb5_context context,
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char *rule,
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krb5_const_principal aname,
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size_t lnsize, char *lname)
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{
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krb5_error_code ret;
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const char *res;
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int root_princs_ok;
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if (strcmp(rule, "NONE") == 0)
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return KRB5_NO_LOCALNAME;
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if (strcmp(rule, "DEFAULT") == 0)
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root_princs_ok = 0;
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else if (strcmp(rule, "HEIMDAL_DEFAULT") == 0)
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root_princs_ok = 1;
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else
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return KRB5_PLUGIN_NO_HANDLE;
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if (!princ_realm_is_default(context, aname))
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return KRB5_PLUGIN_NO_HANDLE;
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if (aname->name.name_string.len == 1) {
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/*
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* One component principal names in default realm -> the one
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* component is the username.
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*/
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res = aname->name.name_string.val[0];
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} else if (root_princs_ok && aname->name.name_string.len == 2 &&
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strcmp (aname->name.name_string.val[1], "root") == 0) {
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/*
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* Two-component principal names in default realm where the
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* first component is "root" -> root IFF the principal is in
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* root's .k5login (or whatever krb5_kuserok() does).
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*/
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krb5_principal rootprinc;
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krb5_boolean userok;
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res = "root";
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ret = krb5_copy_principal(context, aname, &rootprinc);
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if (ret)
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return ret;
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userok = _krb5_kuserok(context, rootprinc, res, FALSE);
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krb5_free_principal(context, rootprinc);
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if (!userok)
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return KRB5_NO_LOCALNAME;
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} else {
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return KRB5_PLUGIN_NO_HANDLE;
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}
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if (strlcpy(lname, res, lnsize) >= lnsize)
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return KRB5_CONFIG_NOTENUFSPACE;
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return 0;
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}
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/**
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* Map a principal name to a local username.
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*
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* Returns 0 on success, KRB5_NO_LOCALNAME if no mapping was found, or
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* some Kerberos or system error.
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*
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* Inputs:
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*
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* @param context A krb5_context
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* @param aname A principal name
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* @param lnsize The size of the buffer into which the username will be written
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* @param lname The buffer into which the username will be written
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*
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* @ingroup krb5_support
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*/
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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krb5_aname_to_localname(krb5_context context,
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krb5_const_principal aname,
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size_t lnsize,
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char *lname)
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{
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static heim_base_once_t reg_def_plugins = HEIM_BASE_ONCE_INIT;
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krb5_error_code ret;
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krb5_realm realm;
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size_t i;
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char **rules = NULL;
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char *rule;
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if (lnsize)
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lname[0] = '\0';
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heim_base_once_f(®_def_plugins, context, reg_def_plugins_once);
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/* Try MIT's auth_to_local_names config first */
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ret = an2ln_local_names(context, aname, lnsize, lname);
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if (ret != KRB5_PLUGIN_NO_HANDLE)
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return ret;
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ret = krb5_get_default_realm(context, &realm);
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if (ret)
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return ret;
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rules = krb5_config_get_strings(context, NULL, "realms", realm,
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"auth_to_local", NULL);
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krb5_xfree(realm);
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if (!rules) {
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/* Heimdal's default rule */
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ret = an2ln_default(context, "HEIMDAL_DEFAULT", aname, lnsize, lname);
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if (ret == KRB5_PLUGIN_NO_HANDLE)
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return KRB5_NO_LOCALNAME;
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return ret;
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}
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/*
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* MIT rules.
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*
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* Note that RULEs and DBs only have white-list functionality,
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* thus RULEs and DBs that we don't understand we simply ignore.
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*
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* This means that plugins that implement black-lists are
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* dangerous: if a black-list plugin isn't found, the black-list
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* won't be enforced. But black-lists are dangerous anyways.
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*/
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for (ret = KRB5_PLUGIN_NO_HANDLE, i = 0; rules[i]; i++) {
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rule = rules[i];
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/* Try NONE, DEFAULT, and HEIMDAL_DEFAULT rules */
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ret = an2ln_default(context, rule, aname, lnsize, lname);
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if (ret == KRB5_PLUGIN_NO_HANDLE)
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/* Try DB, RULE, ... plugins */
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ret = an2ln_plugin(context, rule, aname, lnsize, lname);
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if (ret == 0 && lnsize && !lname[0])
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continue; /* Success but no lname?! lies! */
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else if (ret != KRB5_PLUGIN_NO_HANDLE)
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break;
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}
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if (ret == KRB5_PLUGIN_NO_HANDLE) {
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if (lnsize)
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lname[0] = '\0';
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ret = KRB5_NO_LOCALNAME;
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}
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krb5_config_free_strings(rules);
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return ret;
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}
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static krb5_error_code KRB5_LIB_CALL
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an2ln_def_plug_init(krb5_context context, void **ctx)
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{
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*ctx = NULL;
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return 0;
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}
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static void KRB5_LIB_CALL
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an2ln_def_plug_fini(void *ctx)
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{
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}
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static heim_base_once_t sorted_text_db_init_once = HEIM_BASE_ONCE_INIT;
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static void
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sorted_text_db_init_f(void *arg)
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{
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(void) heim_db_register("sorted-text", NULL, &heim_sorted_text_file_dbtype);
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}
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static krb5_error_code KRB5_LIB_CALL
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an2ln_def_plug_an2ln(void *plug_ctx, krb5_context context,
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const char *rule,
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krb5_const_principal aname,
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set_result_f set_res_f, void *set_res_ctx)
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{
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krb5_error_code ret;
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const char *an2ln_db_fname;
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heim_db_t dbh = NULL;
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heim_dict_t db_options;
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heim_data_t k, v;
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heim_error_t error;
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char *unparsed = NULL;
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char *value = NULL;
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_krb5_load_db_plugins(context);
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heim_base_once_f(&sorted_text_db_init_once, NULL, sorted_text_db_init_f);
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if (strncmp(rule, "DB:", strlen("DB:")) != 0)
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return KRB5_PLUGIN_NO_HANDLE;
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an2ln_db_fname = &rule[strlen("DB:")];
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if (!*an2ln_db_fname)
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return KRB5_PLUGIN_NO_HANDLE;
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ret = krb5_unparse_name(context, aname, &unparsed);
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if (ret)
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return ret;
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db_options = heim_dict_create(11);
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if (db_options != NULL)
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heim_dict_set_value(db_options, HSTR("read-only"),
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heim_number_create(1));
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dbh = heim_db_create(NULL, an2ln_db_fname, db_options, &error);
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if (dbh == NULL) {
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krb5_set_error_message(context, heim_error_get_code(error),
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N_("Couldn't open aname2lname-text-db", ""));
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ret = KRB5_PLUGIN_NO_HANDLE;
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goto cleanup;
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}
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/* Binary search; file should be sorted (in C locale) */
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k = heim_data_ref_create(unparsed, strlen(unparsed), NULL);
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if (k == NULL) {
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ret = krb5_enomem(context);
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goto cleanup;
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}
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v = heim_db_copy_value(dbh, NULL, k, &error);
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heim_release(k);
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if (v == NULL && error != NULL) {
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krb5_set_error_message(context, heim_error_get_code(error),
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N_("Lookup in aname2lname-text-db failed", ""));
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ret = heim_error_get_code(error);
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goto cleanup;
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} else if (v == NULL) {
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ret = KRB5_PLUGIN_NO_HANDLE;
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goto cleanup;
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} else {
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/* found */
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if (heim_data_get_length(v) == 0) {
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krb5_set_error_message(context, ret,
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N_("Principal mapped to empty username", ""));
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ret = KRB5_NO_LOCALNAME;
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goto cleanup;
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}
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value = strndup(heim_data_get_ptr(v), heim_data_get_length(v));
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heim_release(v);
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if (value == NULL) {
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ret = krb5_enomem(context);
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goto cleanup;
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}
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ret = set_res_f(set_res_ctx, value);
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}
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cleanup:
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heim_release(dbh);
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free(unparsed);
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free(value);
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return ret;
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}
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