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- /**
- * Copyright (c) 2008 Guido Guenther <agx@sigxcpu.org>
- *
- * 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.
- **/
- #include <Python.h>
- #include "kerberospw.h"
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #undef PRINTFS
- extern PyObject *PwdChangeException_class;
- static void set_pwchange_error(krb5_context context, krb5_error_code code)
- {
- PyErr_SetObject(PwdChangeException_class, Py_BuildValue("(s:i)",
- krb5_get_err_text(context, code), code));
- }
- /* Inspired by krb5_verify_user from Heimdal */
- static krb5_error_code verify_krb5_user(krb5_context context,
- krb5_principal principal,
- const char *password,
- const char *service,
- krb5_creds* creds)
- {
- krb5_get_init_creds_opt gic_options;
- krb5_error_code code;
- int ret = 0;
-
- #ifdef PRINTFS
- {
- char *name = NULL;
- code = krb5_unparse_name(context, principal, &name);
- if (!code)
- printf("Trying to get TGT for user %s\n", name);
- free(name);
- }
- #endif
- krb5_get_init_creds_opt_init(&gic_options);
- krb5_get_init_creds_opt_set_forwardable(&gic_options, 0);
- krb5_get_init_creds_opt_set_proxiable(&gic_options, 0);
- krb5_get_init_creds_opt_set_renew_life(&gic_options, 0);
- memset(creds, 0, sizeof(krb5_creds));
-
- code = krb5_get_init_creds_password(context, creds, principal,
- (char *)password, NULL, NULL, 0,
- (char *)service, &gic_options);
- if (code) {
- set_pwchange_error(context, code);
- goto end;
- }
- ret = 1; /* success */
- end:
- return ret;
- }
- int change_user_krb5pwd(const char *user, const char* oldpswd, const char *newpswd)
- {
- krb5_context kcontext = NULL;
- krb5_error_code code;
- krb5_principal client = NULL;
- krb5_creds creds;
- int ret = 0;
- char *name = NULL;
- const char* service = "kadmin/changepw";
- int result_code;
- krb5_data result_code_string, result_string;
- code = krb5_init_context(&kcontext);
- if (code) {
- PyErr_SetObject(PwdChangeException_class, Py_BuildValue("((s:i))",
- "Cannot initialize Kerberos5 context",
- code));
- return 0;
- }
- name = (char *)malloc(256);
- snprintf(name, 256, "%s", user);
-
- code = krb5_parse_name(kcontext, name, &client);
- if (code) {
- set_pwchange_error(kcontext, code);
- goto end;
- }
- code = verify_krb5_user(kcontext, client, oldpswd, service, &creds);
- if (!code) /* exception set by verify_krb5_user */
- goto end;
- code = krb5_change_password(kcontext, &creds, (char*)newpswd,
- &result_code, &result_code_string, &result_string);
- if (code) {
- set_pwchange_error(kcontext, code);
- goto end;
- }
- if (result_code) {
- char *message = NULL;
- asprintf(&message, "%.*s: %.*s",
- (int) result_code_string.length,
- (char *) result_code_string.data,
- (int) result_string.length,
- (char *) result_string.data);
- PyErr_SetObject(PwdChangeException_class, Py_BuildValue("((s:i))",
- message, result_code));
- free(message);
- goto end;
- }
- ret = 1; /* success */
- end:
- #ifdef PRINTFS
- printf("%s: ret=%d user=%s\n", __FUNCTION__, ret, name);
- #endif
- if (name)
- free(name);
- if (client)
- krb5_free_principal(kcontext, client);
- krb5_free_context(kcontext);
- return ret;
- }
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