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/* Copyright (C) 2008 CERN
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
/* Author: Ian Baker */
#include <config.h>
#ifdef HAVE_GSSAPI
#include <arpa/inet.h>
#endif
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "auth.h"
#include "distcc.h"
#include "exitcode.h"
#include "netutil.h"
#include "rpc.h"
#include "trace.h"
/*
* Provide a textual representation of a GSS-API or mechanism-specific
* status code and write this to the log file.
*
* @param status_code. Status code to convert.
*
* @param status_type. The type of the status code, either GSS_C_GSS_CODE
* for a GSS-API status code or GSS_C_MECH_CODE
* for a mechanism-specific status code.
*/
void dcc_gssapi_status_to_log(OM_uint32 status_code, int status_type) {
gss_buffer_desc status_string = GSS_C_EMPTY_BUFFER;
OM_uint32 major_status, minor_status;
OM_uint32 message_ctx = 0;
do {
major_status = gss_display_status(&minor_status,
status_code,
status_type,
GSS_C_NULL_OID,
&message_ctx,
&status_string);
rs_log_info("%s: %s", (status_type == GSS_C_GSS_CODE) ? "GSSAPI" : "Mech" ,
(char *) status_string.value);
gss_release_buffer(&minor_status, &status_string);
} while (message_ctx != 0);
}
/*
* Perform a cleanup on specified GSS-API internal data formats.
*
* @param input_tok. The input token to release.
*
* @param output_tok. The output token to release.
*
* @param name. The name to release.
*/
void dcc_gssapi_cleanup(gss_buffer_desc *input_tok,
gss_buffer_desc *output_tok,
gss_name_t *name) {
OM_uint32 major_status, minor_status;
if (input_tok != NULL) {
if ((major_status = gss_release_buffer(&minor_status,
input_tok)) != GSS_S_COMPLETE) {
rs_log_error("Failed to release buffer.");
}
}
if (output_tok != NULL) {
if ((major_status = gss_release_buffer(&minor_status,
output_tok)) != GSS_S_COMPLETE) {
rs_log_error("Failed to release buffer.");
}
}
if (name != NULL) {
if ((major_status = gss_release_name(&minor_status,
name)) != GSS_S_COMPLETE) {
rs_log_error("Failed to release name.");
}
}
}
/*
* Perform a comparison of two sets of flags representing security
* services. At the moment we only check for mutual authentication,
* replay and out of sequence detection, but this function could be
* extended to include others.
*
* @param req_flags. The first set of flags to be compared and
* represents what is required by the client
* or server.
*
* @param ret_flags. The second set of flags to be compared and
* what is provided/returned by the peer.
*
* Returns 0 on success, otherwise error.
*/
int dcc_gssapi_compare_flags(OM_uint32 req_flags, OM_uint32 ret_flags) {
if (req_flags & GSS_C_MUTUAL_FLAG) {
if (ret_flags & GSS_C_MUTUAL_FLAG) {
rs_log_info("Mutual authentication requested and granted.");
} else {
rs_log_crit("Requested security services don't match those returned.");
return EXIT_GSSAPI_FAILED;
}
}
if (req_flags & GSS_C_REPLAY_FLAG) {
if (ret_flags & GSS_C_REPLAY_FLAG) {
rs_log_info("Replay detection requested and granted.");
} else {
rs_log_crit("Requested security services don't match those returned.");
return EXIT_GSSAPI_FAILED;
}
}
if (req_flags & GSS_C_SEQUENCE_FLAG) {
if (ret_flags & GSS_C_SEQUENCE_FLAG) {
rs_log_info("Out of sequence detection requested and granted.");
} else {
rs_log_crit("Requested security services don't match those returned.");
return EXIT_GSSAPI_FAILED;
}
}
return 0;
}
/*
* Delete a specified secure context from the current process.
* The output buffer token is not used as we do not notify the
* peer.
*
* @param ctx_handle. The secure context to delete.
*/
void dcc_gssapi_delete_ctx(gss_ctx_id_t *ctx_handle) {
OM_uint32 major_status, minor_status;
if (ctx_handle != NULL) {
if (*ctx_handle != GSS_C_NO_CONTEXT) {
if ((major_status = gss_delete_sec_context(&minor_status,
ctx_handle,
GSS_C_NO_BUFFER)) != GSS_S_COMPLETE) {
rs_log_error("Failed to delete context.");
}
}
}
}
/*
* Send the specified token. First we transmit the token length,
* then the token itself.
*
* @param token. The token to be sent.
*
* Returns 0 on success, otherwise error.
*/
int send_token(int sd, gss_buffer_t token) {
int ret;
if ((ret = dcc_x_token_int(sd, "TLEN", token->length)) != 0) {
return ret;
}
if ((ret = dcc_writex(sd, token->value, token->length)) != 0) {
return ret;
}
return 0;
}
/*
* Receive a token. First we receive the token length,
* then the token itself.
*
* @param token. The token to be received.
*
* Returns 0 on success, otherwise error.
*/
int recv_token(int sd, gss_buffer_t token) {
int ret;
unsigned length;
if ((ret = dcc_r_token_int(sd, "TLEN", &length)) != 0) {
return ret;
}
if (length > INT_MAX || length == 0) {
rs_log_error("Malformed token length.");
return EXIT_IO_ERROR;
}
token->length = length;
token->value = malloc(length);
if (token->value == NULL && length != 0) {
rs_log_error("malloc failed : %lu bytes: out of memory.",
(unsigned long) length);
return EXIT_OUT_OF_MEMORY;
}
if ((ret = dcc_readx(sd, token->value, token->length)) != 0) {
return ret;
}
return 0;
}
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