/* * Copyright (c) 1997 - 1999 Kungliga Tekniska Högskolan * (Royal Institute of Technology, Stockholm, Sweden). * All rights reserved. * * 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 "krb5_locl.h" RCSID("$Id: kuserok.c,v 1.5.12.1 2002/10/21 14:37:55 joda Exp $"); /* * Return TRUE iff `principal' is allowed to login as `luser'. */ krb5_boolean krb5_kuserok (krb5_context context, krb5_principal principal, const char *luser) { char buf[BUFSIZ]; struct passwd *pwd; FILE *f; krb5_realm *realms, *r; krb5_error_code ret; krb5_boolean b; ret = krb5_get_default_realms (context, &realms); if (ret) return FALSE; for (r = realms; *r != NULL; ++r) { krb5_principal local_principal; ret = krb5_build_principal (context, &local_principal, strlen(*r), *r, luser, NULL); if (ret) { krb5_free_host_realm (context, realms); return FALSE; } b = krb5_principal_compare (context, principal, local_principal); krb5_free_principal (context, local_principal); if (b) { krb5_free_host_realm (context, realms); return TRUE; } } krb5_free_host_realm (context, realms); pwd = getpwnam (luser); /* XXX - Should use k_getpwnam? */ if (pwd == NULL) return FALSE; snprintf (buf, sizeof(buf), "%s/.k5login", pwd->pw_dir); f = fopen (buf, "r"); if (f == NULL) return FALSE; while (fgets (buf, sizeof(buf), f) != NULL) { krb5_principal tmp; buf[strcspn(buf, "\n")] = '\0'; ret = krb5_parse_name (context, buf, &tmp); if (ret) { fclose (f); return FALSE; } b = krb5_principal_compare (context, principal, tmp); krb5_free_principal (context, tmp); if (b) { fclose (f); return TRUE; } } fclose (f); return FALSE; }