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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* plugins/certauth/main.c - certauth plugin test modules. */
/*
* Copyright (C) 2017 by Red Hat, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <k5-int.h>
#include "krb5/certauth_plugin.h"
struct krb5_certauth_moddata_st {
int initialized;
};
/* Test module 1 returns OK with an indicator. */
static krb5_error_code
test1_authorize(krb5_context context, krb5_certauth_moddata moddata,
const uint8_t *cert, size_t cert_len,
krb5_const_principal princ, const void *opts,
const struct _krb5_db_entry_new *db_entry,
char ***authinds_out)
{
char **ais = NULL;
ais = calloc(2, sizeof(*ais));
assert(ais != NULL);
ais[0] = strdup("test1");
assert(ais[0] != NULL);
*authinds_out = ais;
return KRB5_PLUGIN_NO_HANDLE;
}
static void
test_free_ind(krb5_context context, krb5_certauth_moddata moddata,
char **authinds)
{
size_t i;
if (authinds == NULL)
return;
for (i = 0; authinds[i] != NULL; i++)
free(authinds[i]);
free(authinds);
}
/* A basic moddata test. */
static krb5_error_code
test2_init(krb5_context context, krb5_certauth_moddata *moddata_out)
{
krb5_certauth_moddata mod;
mod = calloc(1, sizeof(*mod));
assert(mod != NULL);
mod->initialized = 1;
*moddata_out = mod;
return 0;
}
static void
test2_fini(krb5_context context, krb5_certauth_moddata moddata)
{
free(moddata);
}
/* Return true if cert appears to contain the CN name, based on a search of the
* DER encoding. */
static krb5_boolean
has_cn(krb5_context context, const uint8_t *cert, size_t cert_len,
const char *name)
{
krb5_boolean match = FALSE;
uint8_t name_len, cntag[5] = "\x06\x03\x55\x04\x03";
const uint8_t *c;
struct k5buf buf;
size_t c_left;
/* Construct a DER search string of the CN AttributeType encoding followed
* by a UTF8String encoding containing name as the AttributeValue. */
k5_buf_init_dynamic(&buf);
k5_buf_add_len(&buf, cntag, sizeof(cntag));
k5_buf_add(&buf, "\x0C");
assert(strlen(name) < 128);
name_len = strlen(name);
k5_buf_add_len(&buf, &name_len, 1);
k5_buf_add_len(&buf, name, name_len);
assert(k5_buf_status(&buf) == 0);
/* Check for the CN needle in the certificate haystack. */
c_left = cert_len;
c = memchr(cert, *cntag, c_left);
while (c != NULL) {
c_left = cert_len - (c - cert);
if (buf.len > c_left)
break;
if (memcmp(c, buf.data, buf.len) == 0) {
match = TRUE;
break;
}
assert(c_left >= 1);
c = memchr(c + 1, *cntag, c_left - 1);
}
k5_buf_free(&buf);
return match;
}
/*
* Test module 2 returns OK if princ matches the CN part of the subject name,
* and returns indicators of the module name and princ.
*/
static krb5_error_code
test2_authorize(krb5_context context, krb5_certauth_moddata moddata,
const uint8_t *cert, size_t cert_len,
krb5_const_principal princ, const void *opts,
const struct _krb5_db_entry_new *db_entry,
char ***authinds_out)
{
krb5_error_code ret;
char *name = NULL, **ais = NULL;
*authinds_out = NULL;
assert(moddata != NULL && moddata->initialized);
ret = krb5_unparse_name_flags(context, princ,
KRB5_PRINCIPAL_UNPARSE_NO_REALM, &name);
if (ret)
goto cleanup;
if (!has_cn(context, cert, cert_len, name)) {
ret = KRB5KDC_ERR_CERTIFICATE_MISMATCH;
goto cleanup;
}
/* Create an indicator list with the module name and CN. */
ais = calloc(3, sizeof(*ais));
assert(ais != NULL);
ais[0] = strdup("test2");
ais[1] = strdup(name);
assert(ais[0] != NULL && ais[1] != NULL);
*authinds_out = ais;
ais = NULL;
cleanup:
krb5_free_unparsed_name(context, name);
return ret;
}
krb5_error_code
certauth_test1_initvt(krb5_context context, int maj_ver, int min_ver,
krb5_plugin_vtable vtable);
krb5_error_code
certauth_test1_initvt(krb5_context context, int maj_ver, int min_ver,
krb5_plugin_vtable vtable)
{
krb5_certauth_vtable vt;
if (maj_ver != 1)
return KRB5_PLUGIN_VER_NOTSUPP;
vt = (krb5_certauth_vtable)vtable;
vt->name = "test1";
vt->authorize = test1_authorize;
vt->free_ind = test_free_ind;
return 0;
}
krb5_error_code
certauth_test2_initvt(krb5_context context, int maj_ver, int min_ver,
krb5_plugin_vtable vtable);
krb5_error_code
certauth_test2_initvt(krb5_context context, int maj_ver, int min_ver,
krb5_plugin_vtable vtable)
{
krb5_certauth_vtable vt;
if (maj_ver != 1)
return KRB5_PLUGIN_VER_NOTSUPP;
vt = (krb5_certauth_vtable)vtable;
vt->name = "test2";
vt->authorize = test2_authorize;
vt->init = test2_init;
vt->fini = test2_fini;
vt->free_ind = test_free_ind;
return 0;
}
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