krb5/os/ccdefname.c

/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*
 * lib/krb5/os/ccdefname.c
 *
 * Copyright 1990 by the Massachusetts Institute of Technology.
 * All Rights Reserved.
 *
 * Export of this software from the United States of America may
 *   require a specific license from the United States Government.
 *   It is the responsibility of any person or organization contemplating
 *   export to obtain such a license before exporting.
 *
 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
 * distribute this software and its documentation for any purpose and
 * without fee is hereby granted, provided that the above copyright
 * notice appear in all copies and that both that copyright notice and
 * this permission notice appear in supporting documentation, and that
 * the name of M.I.T. not be used in advertising or publicity pertaining
 * to distribution of the software without specific, written prior
 * permission.  Furthermore if you modify this software you must label
 * your software as modified software and not distribute it in such a
 * fashion that it might be confused with the original M.I.T. software.
 * M.I.T. makes no representations about the suitability of
 * this software for any purpose.  It is provided "as is" without express
 * or implied warranty.
 *
 *
 * Return default cred. cache name.
 */

/*
 * SUNW14resync - because of changes specific to Solaris, future
 * resyncs should leave this file "as is" if possible.
 */

#include <k5-int.h>
#include <stdio.h>

/*
 * Solaris kerberos:  use dirent.h to get maximum filename length MAXNAMLEN
 */
#include <dirent.h>

static krb5_error_code get_from_os(
    char *name_buf,
    int name_size)
{
    krb5_error_code retval;

    /*
     * Solaris Kerberos
     * Use krb5_getuid() to select the mechanism to obtain the uid.
     */
    retval = snprintf(name_buf, name_size, "FILE:/tmp/krb5cc_%d",
        krb5_getuid());
    KRB5_LOG(KRB5_INFO, "get_from_os() FILE=%s\n", name_buf);
    if (retval < 0)
        return retval;
    else
        return 0;
}

/*ARGSUSED*/
krb5_error_code KRB5_CALLCONV
krb5_cc_set_default_name(
    krb5_context context,
    const char *name)
{
    char name_buf[MAXNAMLEN];
    char *new_name = getenv(KRB5_ENV_CCNAME);
    int name_length;
    krb5_error_code retval;
    krb5_os_context os_ctx;

    if (!context || context->magic != KV5M_CONTEXT)
        return KV5M_CONTEXT;

    os_ctx = context->os_context;

    /*
     * Solaris kerberos:
     * Use the following in this order
     *  1) name from arg
     *  2) name from environment variable
     *  3) name from os based on UID
     * resulting string is pointed to by name
     */

    if (!name) {
        /* use environment variable or default */
        if (new_name != 0) { /* so that it is in env variable */
            name = new_name;
        } else {
            retval = get_from_os(name_buf, sizeof(name_buf));
            if (retval)
                return retval;
            name = name_buf;
        }
    }

    name_length = strlen(name);
    if (name_length >= MAXNAMLEN || name_length <=0) {
        KRB5_LOG(KRB5_ERR, "krb5_cc_set_default_name() "
            "bad file size %d\n", name_length);
        return -1;
    }
    new_name = malloc(name_length+1);
        if (!new_name)
        return ENOMEM;
    strcpy(new_name, name);

    if (os_ctx->default_ccname)
        free(os_ctx->default_ccname);

    os_ctx->default_ccname = new_name;
    return 0;
}


const char * KRB5_CALLCONV
krb5_cc_default_name(krb5_context context)
{
    krb5_os_context os_ctx;

    if (!context || context->magic != KV5M_CONTEXT)
        return NULL;

    os_ctx = context->os_context;

    /*
     * Solaris kerberos:  this is a bug fix for service principals.
     * We need to always fetch the ccache name.
     */
    krb5_cc_set_default_name(context, NULL);

    KRB5_LOG(KRB5_INFO, "krb5_cc_default_name() FILE=%s\n",
            os_ctx->default_ccname);

    return(os_ctx->default_ccname);
}