rd_req.c

samba最新软件

	    goto out;
	}
    }

    if (ac->authenticator->seq_number)
	krb5_auth_con_setremoteseqnumber(context, ac,
					 *ac->authenticator->seq_number);

    /* XXX - Xor sequence numbers */

    if (ac->authenticator->subkey) {
	ret = krb5_auth_con_setremotesubkey(context, ac,
					    ac->authenticator->subkey);
	if (ret)
	    goto out;
    }

    ret = find_etypelist(context, ac, &etypes);
    if (ret)
	goto out;

    ac->keytype = ETYPE_NULL;

    if (etypes.val) {
	int i;

	for (i = 0; i < etypes.len; i++) {
	    if (krb5_enctype_valid(context, etypes.val[i]) == 0) {
		ac->keytype = etypes.val[i];
		break;
	    }
	}
    }

    if (ap_req_options) {
	*ap_req_options = 0;
	if (ac->keytype != ETYPE_NULL)
	    *ap_req_options |= AP_OPTS_USE_SUBKEY;
	if (ap_req->ap_options.use_session_key)
	    *ap_req_options |= AP_OPTS_USE_SESSION_KEY;
	if (ap_req->ap_options.mutual_required)
	    *ap_req_options |= AP_OPTS_MUTUAL_REQUIRED;
    }

    if(ticket)
	*ticket = t;
    else
	krb5_free_ticket (context, t);
    if (auth_context) {
	if (*auth_context == NULL)
	    *auth_context = ac;
    } else
	krb5_auth_con_free (context, ac);
    free_EtypeList(&etypes);
    return 0;
 out:
    if (t)
	krb5_free_ticket (context, t);
    if (auth_context == NULL || *auth_context == NULL)
	krb5_auth_con_free (context, ac);
    return ret;
}
		   
/*
 *
 */

struct krb5_rd_req_in_ctx_data {
    krb5_keytab keytab;
    krb5_keyblock *keyblock;
    krb5_boolean check_pac;
};

struct krb5_rd_req_out_ctx_data {
    krb5_keyblock *keyblock;
    krb5_flags ap_req_options;
    krb5_ticket *ticket;
};

/*
 *
 */

krb5_error_code KRB5_LIB_FUNCTION
krb5_rd_req_in_ctx_alloc(krb5_context context, krb5_rd_req_in_ctx *ctx)
{
    *ctx = calloc(1, sizeof(**ctx));
    if (*ctx == NULL) {
	krb5_set_error_string(context, "out of memory");
	return ENOMEM;
    }
    (*ctx)->check_pac = (context->flags & KRB5_CTX_F_CHECK_PAC) ? 1 : 0;
    return 0;
}

krb5_error_code KRB5_LIB_FUNCTION
krb5_rd_req_in_set_keytab(krb5_context context, 
			  krb5_rd_req_in_ctx in,
			  krb5_keytab keytab)
{
    in->keytab = keytab; /* XXX should make copy */
    return 0;
}

/**
 * Set if krb5_rq_red() is going to check the Windows PAC or not
 * 
 * @param context Keberos 5 context.
 * @param in krb5_rd_req_in_ctx to check the option on.
 * @param flag flag to select if to check the pac (TRUE) or not (FALSE).
 *
 * @return Kerberos 5 error code, see krb5_get_error_message().
 *
 * @ingroup krb5
 */

krb5_error_code KRB5_LIB_FUNCTION
krb5_rd_req_in_set_pac_check(krb5_context context, 
			     krb5_rd_req_in_ctx in,
			     krb5_boolean flag)
{
    in->check_pac = flag;
    return 0;
}


krb5_error_code KRB5_LIB_FUNCTION
krb5_rd_req_in_set_keyblock(krb5_context context, 
			    krb5_rd_req_in_ctx in,
			    krb5_keyblock *keyblock)
{
    in->keyblock = keyblock; /* XXX should make copy */
    return 0;
}

krb5_error_code KRB5_LIB_FUNCTION
krb5_rd_req_out_get_ap_req_options(krb5_context context, 
				   krb5_rd_req_out_ctx out,
				   krb5_flags *ap_req_options)
{
    *ap_req_options = out->ap_req_options;
    return 0;
}

krb5_error_code KRB5_LIB_FUNCTION
krb5_rd_req_out_get_ticket(krb5_context context, 
			    krb5_rd_req_out_ctx out,
			    krb5_ticket **ticket)
{
    return krb5_copy_ticket(context, out->ticket, ticket);
}

krb5_error_code KRB5_LIB_FUNCTION
krb5_rd_req_out_get_keyblock(krb5_context context, 
			    krb5_rd_req_out_ctx out,
			    krb5_keyblock **keyblock)
{
    return krb5_copy_keyblock(context, out->keyblock, keyblock);
}

void  KRB5_LIB_FUNCTION
krb5_rd_req_in_ctx_free(krb5_context context, krb5_rd_req_in_ctx ctx)
{
    free(ctx);
}

krb5_error_code KRB5_LIB_FUNCTION
_krb5_rd_req_out_ctx_alloc(krb5_context context, krb5_rd_req_out_ctx *ctx)
{
    *ctx = calloc(1, sizeof(**ctx));
    if (*ctx == NULL) {
	krb5_set_error_string(context, "out of memory");
	return ENOMEM;
    }
    return 0;
}

void  KRB5_LIB_FUNCTION
krb5_rd_req_out_ctx_free(krb5_context context, krb5_rd_req_out_ctx ctx)
{
    krb5_free_keyblock(context, ctx->keyblock);
    free(ctx);
}

/*
 *
 */

krb5_error_code KRB5_LIB_FUNCTION
krb5_rd_req(krb5_context context,
	    krb5_auth_context *auth_context,
	    const krb5_data *inbuf,
	    krb5_const_principal server,
	    krb5_keytab keytab,
	    krb5_flags *ap_req_options,
	    krb5_ticket **ticket)
{
    krb5_error_code ret;
    krb5_rd_req_in_ctx in;
    krb5_rd_req_out_ctx out;

    ret = krb5_rd_req_in_ctx_alloc(context, &in);
    if (ret)
	return ret;
    
    ret = krb5_rd_req_in_set_keytab(context, in, keytab);
    if (ret) {
	krb5_rd_req_in_ctx_free(context, in);
	return ret;
    }

    ret = krb5_rd_req_ctx(context, auth_context, inbuf, server, in, &out);
    krb5_rd_req_in_ctx_free(context, in);
    if (ret)
	return ret;

    if (ap_req_options)
	*ap_req_options = out->ap_req_options;
    if (ticket) {
	ret = krb5_copy_ticket(context, out->ticket, ticket);
	if (ret)
	    goto out;
    }

out:
    krb5_rd_req_out_ctx_free(context, out);
    return ret;
}

/*
 *
 */

krb5_error_code KRB5_LIB_FUNCTION
krb5_rd_req_with_keyblock(krb5_context context,
			  krb5_auth_context *auth_context,
			  const krb5_data *inbuf,
			  krb5_const_principal server,
			  krb5_keyblock *keyblock,
			  krb5_flags *ap_req_options,
			  krb5_ticket **ticket)
{
    krb5_error_code ret;
    krb5_rd_req_in_ctx in;
    krb5_rd_req_out_ctx out;

    ret = krb5_rd_req_in_ctx_alloc(context, &in);
    if (ret)
	return ret;
    
    ret = krb5_rd_req_in_set_keyblock(context, in, keyblock);
    if (ret) {
	krb5_rd_req_in_ctx_free(context, in);
	return ret;
    }

    ret = krb5_rd_req_ctx(context, auth_context, inbuf, server, in, &out);
    krb5_rd_req_in_ctx_free(context, in);
    if (ret)
	return ret;

    if (ap_req_options)
	*ap_req_options = out->ap_req_options;
    if (ticket) {
	ret = krb5_copy_ticket(context, out->ticket, ticket);
	if (ret)
	    goto out;
    }

out:
    krb5_rd_req_out_ctx_free(context, out);
    return ret;
}

/*
 *
 */

static krb5_error_code
get_key_from_keytab(krb5_context context,
		    krb5_auth_context *auth_context,
		    krb5_ap_req *ap_req,
		    krb5_const_principal server,
		    krb5_keytab keytab,
		    krb5_keyblock **out_key)
{
    krb5_keytab_entry entry;
    krb5_error_code ret;
    int kvno;
    krb5_keytab real_keytab;

    if(keytab == NULL)
	krb5_kt_default(context, &real_keytab);
    else
	real_keytab = keytab;
    
    if (ap_req->ticket.enc_part.kvno)
	kvno = *ap_req->ticket.enc_part.kvno;
    else
	kvno = 0;

    ret = krb5_kt_get_entry (context,
			     real_keytab,
			     server,
			     kvno,
			     ap_req->ticket.enc_part.etype,
			     &entry);
    if(ret)
	goto out;
    ret = krb5_copy_keyblock(context, &entry.keyblock, out_key);
    krb5_kt_free_entry (context, &entry);
out:    
    if(keytab == NULL)
	krb5_kt_close(context, real_keytab);
    
    return ret;
}

/*
 *
 */

krb5_error_code KRB5_LIB_FUNCTION
krb5_rd_req_ctx(krb5_context context,
		krb5_auth_context *auth_context,
		const krb5_data *inbuf,
		krb5_const_principal server,
		krb5_rd_req_in_ctx inctx,
		krb5_rd_req_out_ctx *outctx)
{
    krb5_error_code ret;
    krb5_ap_req ap_req;
    krb5_principal service = NULL;
    krb5_rd_req_out_ctx o = NULL;

    ret = _krb5_rd_req_out_ctx_alloc(context, &o);
    if (ret)
	goto out;

    if (*auth_context == NULL) {
	ret = krb5_auth_con_init(context, auth_context);
	if (ret)
	    goto out;
    }

    ret = krb5_decode_ap_req(context, inbuf, &ap_req);
    if(ret)
	goto out;

    if(server == NULL){
	ret = _krb5_principalname2krb5_principal(context,
						 &service,
						 ap_req.ticket.sname,
						 ap_req.ticket.realm);
	if (ret)
	    goto out;
	server = service;
    }
    if (ap_req.ap_options.use_session_key &&
	(*auth_context)->keyblock == NULL) {
	krb5_set_error_string(context, "krb5_rd_req: user to user auth "
			      "without session key given");
	ret = KRB5KRB_AP_ERR_NOKEY;
	goto out;
    }

    if((*auth_context)->keyblock){
	ret = krb5_copy_keyblock(context,
				 (*auth_context)->keyblock,
				 &o->keyblock);
	if (ret)
	    goto out;
    } else if(inctx->keyblock){
	ret = krb5_copy_keyblock(context,
				 inctx->keyblock,
				 &o->keyblock);
	if (ret)
	    goto out;
    } else {
	krb5_keytab keytab = NULL;

	if (inctx && inctx->keytab)
	    keytab = inctx->keytab;

	ret = get_key_from_keytab(context, 
				  auth_context, 
				  &ap_req,
				  server,
				  keytab,
				  &o->keyblock);
	if(ret)
	    goto out;
    }

    ret = krb5_verify_ap_req2(context,
			      auth_context,
			      &ap_req,
			      server,
			      o->keyblock,
			      0,
			      &o->ap_req_options,
			      &o->ticket,
			      KRB5_KU_AP_REQ_AUTH);

    if (ret)
	goto out;

    /* If there is a PAC, verify its server signature */
    if (inctx->check_pac) {
	krb5_pac pac;
	krb5_data data;

	ret = krb5_ticket_get_authorization_data_type(context,
						      o->ticket,
						      KRB5_AUTHDATA_WIN2K_PAC,
						      &data);
	if (ret == 0) {
	    ret = krb5_pac_parse(context, data.data, data.length, &pac);
	    krb5_data_free(&data);
	    if (ret)
		goto out;
	
	    ret = krb5_pac_verify(context,
				  pac, 
				  o->ticket->ticket.authtime,
				  o->ticket->client, 
				  o->keyblock, 
				  NULL);
	    krb5_pac_free(context, pac);
	    if (ret)
		goto out;
	}
	ret = 0;
    }
out:
    if (ret || outctx == NULL) {
	krb5_rd_req_out_ctx_free(context, o);
    } else 
	*outctx = o;

    free_AP_REQ(&ap_req);
    if(service)
	krb5_free_principal(context, service);
    return ret;
}