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/**
* FreeRDP: A Remote Desktop Protocol Client
* Kerberos Auth Protocol
*
* Copyright 2022 Isaac Klein <fifthdegree@protonmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef WITH_KRB5_MIT
#error "This file must only be included with MIT kerberos"
#endif
#include <winpr/path.h>
#include <winpr/wlog.h>
#include <winpr/endian.h>
#include <winpr/crypto.h>
#include <winpr/print.h>
#include <winpr/assert.h>
#include <errno.h>
#include "krb5glue.h"
#include <profile.h>
static char* create_temporary_file(void)
{
BYTE buffer[32];
char* hex = NULL;
char* path = NULL;
winpr_RAND(buffer, sizeof(buffer));
hex = winpr_BinToHexString(buffer, sizeof(buffer), FALSE);
path = GetKnownSubPath(KNOWN_PATH_TEMP, hex);
free(hex);
return path;
}
void krb5glue_keys_free(krb5_context ctx, struct krb5glue_keyset* keyset)
{
WINPR_ASSERT(ctx);
WINPR_ASSERT(keyset);
krb5_k_free_key(ctx, keyset->session_key);
krb5_k_free_key(ctx, keyset->initiator_key);
krb5_k_free_key(ctx, keyset->acceptor_key);
}
krb5_error_code krb5glue_update_keyset(krb5_context ctx, krb5_auth_context auth_ctx, BOOL acceptor,
struct krb5glue_keyset* keyset)
{
WINPR_ASSERT(ctx);
WINPR_ASSERT(auth_ctx);
WINPR_ASSERT(keyset);
krb5glue_keys_free(ctx, keyset);
krb5_auth_con_getkey_k(ctx, auth_ctx, &keyset->session_key);
if (acceptor)
{
krb5_auth_con_getsendsubkey_k(ctx, auth_ctx, &keyset->acceptor_key);
krb5_auth_con_getrecvsubkey_k(ctx, auth_ctx, &keyset->initiator_key);
}
else
{
krb5_auth_con_getsendsubkey_k(ctx, auth_ctx, &keyset->initiator_key);
krb5_auth_con_getrecvsubkey_k(ctx, auth_ctx, &keyset->acceptor_key);
}
return 0;
}
krb5_prompt_type krb5glue_get_prompt_type(krb5_context ctx, krb5_prompt prompts[], int index)
{
WINPR_ASSERT(ctx);
WINPR_ASSERT(prompts);
krb5_prompt_type* types = krb5_get_prompt_types(ctx);
return types ? types[index] : 0;
}
krb5_error_code krb5glue_log_error(krb5_context ctx, krb5_data* msg, const char* tag)
{
krb5_error* error = NULL;
krb5_error_code rv = 0;
WINPR_ASSERT(ctx);
WINPR_ASSERT(msg);
WINPR_ASSERT(tag);
if (!(rv = krb5_rd_error(ctx, msg, &error)))
{
WLog_ERR(tag, "KRB_ERROR: %s", error->text.data);
krb5_free_error(ctx, error);
}
return rv;
}
BOOL krb5glue_authenticator_validate_chksum(krb5glue_authenticator authenticator, int cksumtype,
uint32_t* flags)
{
WINPR_ASSERT(flags);
if (!authenticator || !authenticator->checksum ||
authenticator->checksum->checksum_type != cksumtype || authenticator->checksum->length < 24)
return FALSE;
Data_Read_UINT32((authenticator->checksum->contents + 20), (*flags));
return TRUE;
}
krb5_error_code krb5glue_get_init_creds(krb5_context ctx, krb5_principal princ, krb5_ccache ccache,
krb5_prompter_fct prompter, char* password,
SEC_WINPR_KERBEROS_SETTINGS* krb_settings)
{
krb5_error_code rv = 0;
krb5_deltat start_time = 0;
krb5_get_init_creds_opt* gic_opt = NULL;
krb5_init_creds_context creds_ctx = NULL;
char* tmp_profile_path = create_temporary_file();
profile_t profile = NULL;
BOOL is_temp_ctx = FALSE;
WINPR_ASSERT(ctx);
rv = krb5_get_init_creds_opt_alloc(ctx, &gic_opt);
if (rv)
goto cleanup;
krb5_get_init_creds_opt_set_forwardable(gic_opt, 0);
krb5_get_init_creds_opt_set_proxiable(gic_opt, 0);
if (krb_settings)
{
if (krb_settings->startTime)
start_time = krb_settings->startTime;
if (krb_settings->lifeTime)
krb5_get_init_creds_opt_set_tkt_life(gic_opt, krb_settings->lifeTime);
if (krb_settings->renewLifeTime)
krb5_get_init_creds_opt_set_renew_life(gic_opt, krb_settings->renewLifeTime);
if (krb_settings->withPac)
{
rv = krb5_get_init_creds_opt_set_pac_request(ctx, gic_opt, TRUE);
if (rv)
goto cleanup;
}
if (krb_settings->armorCache)
{
rv = krb5_get_init_creds_opt_set_fast_ccache_name(ctx, gic_opt,
krb_settings->armorCache);
if (rv)
goto cleanup;
}
if (krb_settings->pkinitX509Identity)
{
rv = krb5_get_init_creds_opt_set_pa(ctx, gic_opt, "X509_user_identity",
krb_settings->pkinitX509Identity);
if (rv)
goto cleanup;
}
if (krb_settings->pkinitX509Anchors)
{
rv = krb5_get_init_creds_opt_set_pa(ctx, gic_opt, "X509_anchors",
krb_settings->pkinitX509Anchors);
if (rv)
goto cleanup;
}
if (krb_settings->kdcUrl)
{
const char* names[4] = { 0 };
char* realm = NULL;
char* kdc_url = NULL;
size_t size = 0;
if ((rv = krb5_get_profile(ctx, &profile)))
goto cleanup;
rv = ENOMEM;
if (winpr_asprintf(&kdc_url, &size, "https://%s/KdcProxy", krb_settings->kdcUrl) <= 0)
{
free(kdc_url);
goto cleanup;
}
realm = calloc(princ->realm.length + 1, 1);
if (!realm)
{
free(kdc_url);
goto cleanup;
}
CopyMemory(realm, princ->realm.data, princ->realm.length);
names[0] = "realms";
names[1] = realm;
names[2] = "kdc";
profile_clear_relation(profile, names);
profile_add_relation(profile, names, kdc_url);
/* Since we know who the KDC is, tell krb5 that its certificate is valid for pkinit */
names[2] = "pkinit_kdc_hostname";
profile_add_relation(profile, names, krb_settings->kdcUrl);
free(kdc_url);
free(realm);
if ((rv = profile_flush_to_file(profile, tmp_profile_path)))
goto cleanup;
profile_abandon(profile);
profile = NULL;
if ((rv = profile_init_path(tmp_profile_path, &profile)))
goto cleanup;
if ((rv = krb5_init_context_profile(profile, 0, &ctx)))
goto cleanup;
is_temp_ctx = TRUE;
}
}
if ((rv = krb5_get_init_creds_opt_set_in_ccache(ctx, gic_opt, ccache)))
goto cleanup;
if ((rv = krb5_get_init_creds_opt_set_out_ccache(ctx, gic_opt, ccache)))
goto cleanup;
if ((rv =
krb5_init_creds_init(ctx, princ, prompter, password, start_time, gic_opt, &creds_ctx)))
goto cleanup;
if ((rv = krb5_init_creds_get(ctx, creds_ctx)))
goto cleanup;
cleanup:
krb5_init_creds_free(ctx, creds_ctx);
krb5_get_init_creds_opt_free(ctx, gic_opt);
if (is_temp_ctx)
krb5_free_context(ctx);
profile_abandon(profile);
winpr_DeleteFile(tmp_profile_path);
free(tmp_profile_path);
return rv;
}
|
