int change_user_krb5pwd()

in src/kerberospw.c [81:172]

• 82 lines of code
• 10 McCabe index (conditional complexity)

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;
    int             bytes = 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);
    if (name == NULL)
    {
        PyErr_NoMemory();
        goto end;
    }
    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;
        bytes = asprintf(
            &message, "%.*s: %.*s",
            (int) result_code_string.length,
            (char *) result_code_string.data,
            (int) result_string.length,
            (char *) result_string.data
        );
        if (bytes == -1)
        {
            PyErr_NoMemory();
        }
        else
        {
            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;
}