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heimdal/kdc/kdc-plugin.c
Joseph Sutton d5ad04a7f3 kdc: Add function to add encrypted padata 
Since plugins no longer have a way of accessing the 'ek' member of the
request structure, this function provides a way for a plugin to add
encrypted padata to the response.

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
2022-03-08 18:58:17 +11:00

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/*
* Copyright (c) 2007 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Portions (c) 2021, 2022 PADL Software Pty Ltd.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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 "kdc_locl.h"
static int have_plugin = 0;
/*
* Pick the first KDC plugin module that we find.
*/
static const char *kdc_plugin_deps[] = {
"kdc",
"krb5",
"hdb",
NULL
};
static struct heim_plugin_data kdc_plugin_data = {
"krb5",
"kdc",
KRB5_PLUGIN_KDC_VERSION_10,
kdc_plugin_deps,
kdc_get_instance
};
static krb5_error_code KRB5_LIB_CALL
load(krb5_context context, const void *plug, void *plugctx, void *userctx)
{
have_plugin = 1;
return KRB5_PLUGIN_NO_HANDLE;
}
KDC_LIB_FUNCTION krb5_error_code KDC_LIB_CALL
krb5_kdc_plugin_init(krb5_context context)
{
(void)_krb5_plugin_run_f(context, &kdc_plugin_data, 0, NULL, load);
return 0;
}
struct generate_uc {
astgs_request_t r;
hdb_entry *client;
hdb_entry *server;
const krb5_keyblock *reply_key;
uint64_t pac_attributes;
krb5_pac *pac;
};
static krb5_error_code KRB5_LIB_CALL
generate(krb5_context context, const void *plug, void *plugctx, void *userctx)
{
const krb5plugin_kdc_ftable *ft = (const krb5plugin_kdc_ftable *)plug;
struct generate_uc *uc = (struct generate_uc *)userctx;
if (ft->pac_generate == NULL)
return KRB5_PLUGIN_NO_HANDLE;
return ft->pac_generate((void *)plug,
uc->r,
uc->client,
uc->server,
uc->reply_key,
uc->pac_attributes,
uc->pac);
}
krb5_error_code
_kdc_pac_generate(astgs_request_t r,
hdb_entry *client,
hdb_entry *server,
const krb5_keyblock *reply_key,
uint64_t pac_attributes,
krb5_pac *pac)
{
krb5_error_code ret = 0;
struct generate_uc uc;
*pac = NULL;
if (krb5_config_get_bool_default(r->context, NULL, FALSE, "realms",
client->principal->realm,
"disable_pac", NULL))
return 0;
if (have_plugin) {
uc.r = r;
uc.client = client;
uc.server = server;
uc.reply_key = reply_key;
uc.pac = pac;
uc.pac_attributes = pac_attributes;
ret = _krb5_plugin_run_f(r->context, &kdc_plugin_data,
0, &uc, generate);
if (ret != KRB5_PLUGIN_NO_HANDLE)
return ret;
ret = 0;
}
if (*pac == NULL)
ret = krb5_pac_init(r->context, pac);
return ret;
}
struct verify_uc {
astgs_request_t r;
krb5_principal client_principal;
krb5_principal delegated_proxy_principal;
hdb_entry *client;
hdb_entry *server;
hdb_entry *krbtgt;
krb5_pac *pac;
};
static krb5_error_code KRB5_LIB_CALL
verify(krb5_context context, const void *plug, void *plugctx, void *userctx)
{
const krb5plugin_kdc_ftable *ft = (const krb5plugin_kdc_ftable *)plug;
struct verify_uc *uc = (struct verify_uc *)userctx;
krb5_error_code ret;
if (ft->pac_verify == NULL)
return KRB5_PLUGIN_NO_HANDLE;
ret = ft->pac_verify((void *)plug,
uc->r,
uc->client_principal,
uc->delegated_proxy_principal,
uc->client, uc->server, uc->krbtgt, uc->pac);
return ret;
}
krb5_error_code
_kdc_pac_verify(astgs_request_t r,
const krb5_principal client_principal,
const krb5_principal delegated_proxy_principal,
hdb_entry *client,
hdb_entry *server,
hdb_entry *krbtgt,
krb5_pac *pac)
{
struct verify_uc uc;
if (!have_plugin)
return KRB5_PLUGIN_NO_HANDLE;
uc.r = r;
uc.client_principal = client_principal;
uc.delegated_proxy_principal = delegated_proxy_principal;
uc.client = client;
uc.server = server;
uc.krbtgt = krbtgt;
uc.pac = pac;
return _krb5_plugin_run_f(r->context, &kdc_plugin_data,
0, &uc, verify);
}
static krb5_error_code KRB5_LIB_CALL
check(krb5_context context, const void *plug, void *plugctx, void *userctx)
{
const krb5plugin_kdc_ftable *ft = (const krb5plugin_kdc_ftable *)plug;
if (ft->client_access == NULL)
return KRB5_PLUGIN_NO_HANDLE;
return ft->client_access((void *)plug, userctx);
}
krb5_error_code
_kdc_check_access(astgs_request_t r)
{
krb5_error_code ret = KRB5_PLUGIN_NO_HANDLE;
if (have_plugin) {
ret = _krb5_plugin_run_f(r->context, &kdc_plugin_data,
0, r, check);
}
if (ret == KRB5_PLUGIN_NO_HANDLE)
return kdc_check_flags(r, r->req.msg_type == krb_as_req,
r->client, r->server);
return ret;
}
static krb5_error_code KRB5_LIB_CALL
referral_policy(krb5_context context, const void *plug, void *plugctx, void *userctx)
{
const krb5plugin_kdc_ftable *ft = (const krb5plugin_kdc_ftable *)plug;
if (ft->referral_policy == NULL)
return KRB5_PLUGIN_NO_HANDLE;
return ft->referral_policy((void *)plug, userctx);
}
krb5_error_code
_kdc_referral_policy(astgs_request_t r)
{
krb5_error_code ret = KRB5_PLUGIN_NO_HANDLE;
if (have_plugin)
ret = _krb5_plugin_run_f(r->context, &kdc_plugin_data, 0, r, referral_policy);
return ret;
}
static krb5_error_code KRB5_LIB_CALL
finalize_reply(krb5_context context, const void *plug, void *plugctx, void *userctx)
{
const krb5plugin_kdc_ftable *ft = (const krb5plugin_kdc_ftable *)plug;
if (ft->finalize_reply == NULL)
return KRB5_PLUGIN_NO_HANDLE;
return ft->finalize_reply((void *)plug, userctx);
}
krb5_error_code
_kdc_finalize_reply(astgs_request_t r)
{
krb5_error_code ret = KRB5_PLUGIN_NO_HANDLE;
if (have_plugin)
ret = _krb5_plugin_run_f(r->context, &kdc_plugin_data, 0, r, finalize_reply);
if (ret == KRB5_PLUGIN_NO_HANDLE)
ret = 0;
return ret;
}
static krb5_error_code KRB5_LIB_CALL
audit(krb5_context context, const void *plug, void *plugctx, void *userctx)
{
const krb5plugin_kdc_ftable *ft = (const krb5plugin_kdc_ftable *)plug;
if (ft->audit == NULL)
return KRB5_PLUGIN_NO_HANDLE;
return ft->audit((void *)plug, userctx);
}
krb5_error_code
_kdc_plugin_audit(astgs_request_t r)
{
krb5_error_code ret = KRB5_PLUGIN_NO_HANDLE;
if (have_plugin)
ret = _krb5_plugin_run_f(r->context, &kdc_plugin_data, 0, r, audit);
if (ret == KRB5_PLUGIN_NO_HANDLE)
ret = 0;
return ret;
}
KDC_LIB_FUNCTION uintptr_t KDC_LIB_CALL
kdc_get_instance(const char *libname)
{
static const char *instance = "libkdc";
if (strcmp(libname, "kdc") == 0)
return (uintptr_t)instance;
else if (strcmp(libname, "hdb") == 0)
return hdb_get_instance(libname);
else if (strcmp(libname, "krb5") == 0)
return krb5_get_instance(libname);
return 0;
}
/*
* Minimum API surface wrapper for libheimbase object types so it
* may remain a private interface, yet plugins can interact with
* objects.
*/
KDC_LIB_FUNCTION kdc_object_t KDC_LIB_CALL
kdc_object_alloc(size_t size, const char *name, kdc_type_dealloc dealloc)
{
return heim_alloc(size, name, dealloc);
}
KDC_LIB_FUNCTION kdc_object_t KDC_LIB_CALL
kdc_object_retain(kdc_object_t o)
{
return heim_retain(o);
}
KDC_LIB_FUNCTION void KDC_LIB_CALL
kdc_object_release(kdc_object_t o)
{
heim_release(o);
}
KDC_LIB_FUNCTION kdc_object_t KDC_LIB_CALL
kdc_bool_create(krb5_boolean v)
{
return heim_bool_create(v);
}
KDC_LIB_FUNCTION krb5_boolean KDC_LIB_CALL
kdc_bool_get_value(kdc_object_t o)
{
return heim_bool_val(o);
}
struct kdc_array_iterator_trampoline_data {
kdc_array_iterator_t iter;
void *data;
};
/*
* Calling convention shim to avoid needing to update all internal
* consumers of heim_array_iterate_f()
*/
static void
_kdc_array_iterator_trampoline(kdc_object_t o, void *data, int *stop)
{
struct kdc_array_iterator_trampoline_data *t = data;
t->iter(o, t->data, stop);
}
KDC_LIB_FUNCTION void KDC_LIB_CALL
kdc_array_iterate(kdc_array_t a, void *d, kdc_array_iterator_t iter)
{
struct kdc_array_iterator_trampoline_data t;
t.iter = iter;
t.data = d;
heim_array_iterate_f((heim_array_t)a, &t, _kdc_array_iterator_trampoline);
}
KDC_LIB_FUNCTION size_t KDC_LIB_CALL
kdc_array_get_length(kdc_array_t a)
{
return heim_array_get_length((heim_array_t)a);
}
KDC_LIB_FUNCTION kdc_object_t KDC_LIB_CALL
kdc_array_get_value(heim_array_t a, size_t i)
{
return heim_array_get_value((heim_array_t)a, i);
}
KDC_LIB_FUNCTION kdc_object_t KDC_LIB_CALL
kdc_array_copy_value(heim_array_t a, size_t i)
{
return heim_array_copy_value((heim_array_t)a, i);
}
KDC_LIB_FUNCTION kdc_string_t KDC_LIB_CALL
kdc_string_create(const char *s)
{
return (kdc_string_t)heim_string_create(s);
}
KDC_LIB_FUNCTION const char * KDC_LIB_CALL
kdc_string_get_utf8(kdc_string_t s)
{
return heim_string_get_utf8((heim_string_t)s);
}
KDC_LIB_FUNCTION kdc_data_t
kdc_data_create(const void *d, size_t len)
{
return (kdc_data_t)heim_data_create(d, len);
}
KDC_LIB_FUNCTION const krb5_data * KDC_LIB_CALL
kdc_data_get_data(kdc_data_t d)
{
return heim_data_get_data((heim_data_t)d);
}
KDC_LIB_FUNCTION kdc_number_t KDC_LIB_CALL
kdc_number_create(int64_t v)
{
return (kdc_number_t)heim_number_create(v);
}
KDC_LIB_FUNCTION int64_t KDC_LIB_CALL
kdc_number_get_value(kdc_number_t n)
{
return heim_number_get_long((heim_number_t)n);
}
/*
* Plugin accessors
*/
KDC_LIB_FUNCTION krb5_error_code KDC_LIB_CALL
kdc_request_add_reply_padata(astgs_request_t r, PA_DATA *md)
{
heim_assert(r->rep.padata != NULL, "reply padata not allocated");
return add_METHOD_DATA(r->rep.padata, md);
}
KDC_LIB_FUNCTION krb5_error_code KDC_LIB_CALL
kdc_request_add_encrypted_padata(astgs_request_t r, PA_DATA *md)
{
if (r->ek.encrypted_pa_data == NULL) {
r->ek.encrypted_pa_data = calloc(1, sizeof *(r->ek.encrypted_pa_data));
if (r->ek.encrypted_pa_data == NULL) {
return ENOMEM;
}
}
return add_METHOD_DATA(r->ek.encrypted_pa_data, md);
}
KDC_LIB_FUNCTION krb5_error_code KDC_LIB_CALL
kdc_request_add_pac_buffer(astgs_request_t r,
uint32_t pactype,
const krb5_data *d)
{
krb5_error_code ret;
krb5_pac pac;
if (r->pac == NULL) {
ret = krb5_pac_init(r->context, &pac);
if (ret)
return ret;
} else
pac = heim_retain(r->pac);
ret = krb5_pac_add_buffer(r->context, pac, pactype, d);
if (ret == 0 && r->pac == NULL)
r->pac = pac;
else
heim_release(pac);
return ret;
}
#undef _KDC_REQUEST_GET_ACCESSOR
#define _KDC_REQUEST_GET_ACCESSOR(R, T, f) \
KDC_LIB_FUNCTION T KDC_LIB_CALL \
kdc_request_get_ ## f(R r) \
{ \
return r->f; \
}
#undef _KDC_REQUEST_SET_ACCESSOR
#define _KDC_REQUEST_SET_ACCESSOR(R, T, f) \
KDC_LIB_FUNCTION void KDC_LIB_CALL \
kdc_request_set_ ## f(R r, T v) \
{ \
r->f = v; \
}
#undef _KDC_REQUEST_GET_ACCESSOR_PTR
#define _KDC_REQUEST_GET_ACCESSOR_PTR(R, T, f) \
KDC_LIB_FUNCTION const T KDC_LIB_CALL \
kdc_request_get_ ## f(R r) \
{ \
return r->f; \
}
#undef _KDC_REQUEST_SET_ACCESSOR_PTR
#define _KDC_REQUEST_SET_ACCESSOR_PTR(R, T, t, f) \
KDC_LIB_FUNCTION krb5_error_code KDC_LIB_CALL \
kdc_request_set_ ## f(R r, const T v) \
{ \
krb5_error_code ret; \
T tmp; \
\
if (v == r->f) \
return 0; \
else if (v) { \
ret = copy_##t(v, &tmp); \
if (ret) \
return ret; \
} else \
tmp = NULL; \
\
free_##t(r->f); \
r->f = tmp; \
\
return 0; \
}
#undef _KDC_REQUEST_GET_ACCESSOR_STRUCT
#define _KDC_REQUEST_GET_ACCESSOR_STRUCT(R, T, f) \
KDC_LIB_FUNCTION const T * KDC_LIB_CALL \
kdc_request_get_ ## f(R r) \
{ \
return &r->f; \
}
#undef _KDC_REQUEST_SET_ACCESSOR_STRUCT
#define _KDC_REQUEST_SET_ACCESSOR_STRUCT(R, T, t, f) \
KDC_LIB_FUNCTION krb5_error_code KDC_LIB_CALL \
kdc_request_set_ ## f(R r, const T *v) \
{ \
krb5_error_code ret; \
T tmp; \
\
if (v == NULL) \
return EINVAL; \
else if (v == &r->f) \
return 0; \
\
ret = copy_##t(v, &tmp); \
if (ret) \
return ret; \
\
free_##t(&r->f); \
r->f = tmp; \
\
return 0; \
}
static krb5_error_code
copy_string_ptr(const char *src, char **dst)
{
*dst = strdup(src);
if (*dst == NULL)
return ENOMEM;
return 0;
}
static void
free_string_ptr(char *s)
{
free(s);
}
static krb5_error_code
copy_Principal_ptr(krb5_const_principal src, krb5_principal *dst)
{
krb5_error_code ret;
krb5_principal p;
*dst = NULL;
p = calloc(1, sizeof(*p));
if (p == NULL)
return ENOMEM;
ret = copy_Principal(src, p);
if (ret == 0)
*dst = p;
else
free(p);
return ret;
}
static void
free_Principal_ptr(krb5_principal p)
{
if (p) {
free_Principal(p);
free(p);
}
}
static krb5_error_code
copy_pac(const struct krb5_pac_data *src, struct krb5_pac_data **dst)
{
/* FIXME use heim_copy() when it exists */
*dst = (krb5_pac)heim_retain((heim_object_t)src);
return 0;
}
static void
free_pac(struct krb5_pac_data *o)
{
heim_release(o);
}
static krb5_error_code
copy_keyblock(const EncryptionKey *src, EncryptionKey *dst)
{
return copy_EncryptionKey(src, dst);
}
static void
free_keyblock(EncryptionKey *key)
{
krb5_free_keyblock_contents(NULL, key);
}
#undef HEIMDAL_KDC_KDC_ACCESSORS_H
#include "kdc-accessors.h"
#undef _KDC_REQUEST_GET_ACCESSOR
#undef _KDC_REQUEST_SET_ACCESSOR
#undef _KDC_REQUEST_GET_ACCESSOR_PTR
#undef _KDC_REQUEST_SET_ACCESSOR_PTR
#define _KDC_REQUEST_SET_ACCESSOR_PTR(R, T, t, f) \
void \
_kdc_request_set_ ## f ## _nocopy(R r, T *v) \
{ \
if (*v != r->f) { \
free_##t(r->f); \
r->f = *v; \
} \
*v = NULL; \
}
#undef _KDC_REQUEST_GET_ACCESSOR_STRUCT
#undef _KDC_REQUEST_SET_ACCESSOR_STRUCT
#define _KDC_REQUEST_SET_ACCESSOR_STRUCT(R, T, t, f) \
void \
_kdc_request_set_ ## f ## _nocopy(R r, T *v) \
{ \
if (v != &r->f) { \
free_##t(&r->f); \
r->f = *v; \
} \
memset(v, 0, sizeof(*v)); \
}
#undef HEIMDAL_KDC_KDC_ACCESSORS_H
#include "kdc-accessors.h"
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