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assuan-socket-server.c
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/* assuan-socket-server.c - Assuan socket based server
* Copyright (C) 2002, 2007, 2009 Free Software Foundation, Inc.
*
* This file is part of Assuan.
*
* Assuan is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* Assuan 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see <http://www.gnu.org/licenses/>.
* SPDX-License-Identifier: LGPL-2.1+
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_W32_SYSTEM
# ifdef HAVE_WINSOCK2_H
# include <winsock2.h>
# endif
# include <windows.h>
# if HAVE_SYS_SOCKET_H
# include <sys/socket.h>
# elif HAVE_WS2TCPIP_H
# include <ws2tcpip.h>
# endif
#else
# include <sys/socket.h>
# include <sys/un.h>
#endif
#ifdef HAVE_SYS_UCRED_H
#include <sys/ucred.h>
#endif
#ifdef HAVE_UCRED_H
#include <ucred.h>
#endif
#include "debug.h"
#include "assuan-defs.h"
static gpg_error_t
accept_connection_bottom (assuan_context_t ctx)
{
assuan_fd_t fd = ctx->connected_fd;
TRACE (ctx, ASSUAN_LOG_SYSIO, "accept_connection_bottom", ctx);
ctx->peercred_valid = 0;
#ifdef SO_PEERCRED
{
#ifdef HAVE_STRUCT_SOCKPEERCRED_PID
struct sockpeercred cr; /* OpenBSD */
#else
struct ucred cr; /* GNU/Linux */
#endif
socklen_t cl = sizeof cr;
if (!getsockopt (fd, SOL_SOCKET, SO_PEERCRED, &cr, &cl))
{
ctx->peercred_valid = 1;
ctx->peercred.pid = cr.pid;
ctx->peercred.uid = cr.uid;
ctx->peercred.gid = cr.gid;
}
}
#elif defined (LOCAL_PEERPID)
{ /* macOS */
socklen_t len = sizeof (pid_t);
if (!getsockopt (fd, SOL_LOCAL, LOCAL_PEERPID, &ctx->peercred.pid, &len))
{
ctx->peercred_valid = 1;
#if defined (LOCAL_PEERCRED)
{
struct xucred cr;
len = sizeof (struct xucred);
if (!getsockopt (fd, SOL_LOCAL, LOCAL_PEERCRED, &cr, &len))
{
ctx->peercred.uid = cr.cr_uid;
ctx->peercred.gid = cr.cr_gid;
}
}
#endif
}
}
#elif defined (LOCAL_PEEREID)
{ /* NetBSD */
struct unpcbid unp;
socklen_t unpl = sizeof unp;
if (getsockopt (fd, 0, LOCAL_PEEREID, &unp, &unpl) != -1)
{
ctx->peercred_valid = 1;
ctx->peercred.pid = unp.unp_pid;
ctx->peercred.uid = unp.unp_euid;
ctx->peercred.gid = unp.unp_egid;
}
}
#elif defined (HAVE_GETPEERUCRED)
{ /* Solaris */
ucred_t *ucred = NULL;
if (getpeerucred (fd, &ucred) != -1)
{
ctx->peercred_valid = 1;
ctx->peercred.pid = ucred_getpid (ucred);
ctx->peercred.uid = ucred_geteuid (ucred);
ctx->peercred.gid = ucred_getegid (ucred);
ucred_free (ucred);
}
}
#elif defined(HAVE_GETPEEREID)
{ /* FreeBSD */
if (getpeereid (fd, &ctx->peercred.uid, &ctx->peercred.gid) != -1)
{
ctx->peercred_valid = 1;
ctx->peercred.pid = ASSUAN_INVALID_PID;
}
}
#endif
/* This overrides any already set PID if the function returns
a valid one. */
if (ctx->peercred_valid && ctx->peercred.pid != ASSUAN_INVALID_PID)
ctx->pid = ctx->peercred.pid;
ctx->inbound.fd = fd;
ctx->inbound.eof = 0;
ctx->inbound.linelen = 0;
ctx->inbound.attic.linelen = 0;
ctx->inbound.attic.pending = 0;
ctx->outbound.fd = fd;
ctx->outbound.data.linelen = 0;
ctx->outbound.data.error = 0;
ctx->flags.confidential = 0;
return 0;
}
static gpg_error_t
accept_connection (assuan_context_t ctx)
{
assuan_fd_t fd;
struct sockaddr_un clnt_addr;
socklen_t len = sizeof clnt_addr;
TRACE1 (ctx, ASSUAN_LOG_SYSIO, "accept_connection", ctx,
"listen_fd=0x%x", ctx->listen_fd);
fd = SOCKET2HANDLE(accept (HANDLE2SOCKET(ctx->listen_fd),
(struct sockaddr*)&clnt_addr, &len ));
if (fd == ASSUAN_INVALID_FD)
{
return _assuan_error (ctx, gpg_err_code_from_syserror ());
}
TRACE1 (ctx, ASSUAN_LOG_SYSIO, "accept_connection", ctx,
"fd->0x%x", fd);
if (_assuan_sock_check_nonce (ctx, fd, &ctx->listen_nonce))
{
_assuan_close (ctx, fd);
return _assuan_error (ctx, GPG_ERR_ASS_ACCEPT_FAILED);
}
ctx->connected_fd = fd;
return accept_connection_bottom (ctx);
}
/*
Flag bits: 0 - use sendmsg/recvmsg to allow descriptor passing
1 - FD has already been accepted.
*/
gpg_error_t
assuan_init_socket_server (assuan_context_t ctx, assuan_fd_t fd,
unsigned int flags)
{
gpg_error_t rc;
TRACE_BEG2 (ctx, ASSUAN_LOG_CTX, "assuan_init_socket_server", ctx,
"fd=0x%x, flags=0x%x", fd, flags);
ctx->flags.is_socket = 1;
rc = _assuan_register_std_commands (ctx);
if (rc)
return TRACE_ERR (rc);
ctx->engine.release = _assuan_server_release;
ctx->engine.readfnc = _assuan_simple_read;
ctx->engine.writefnc = _assuan_simple_write;
ctx->engine.sendfd = NULL;
ctx->engine.receivefd = NULL;
ctx->flags.is_server = 1;
if (flags & ASSUAN_SOCKET_SERVER_ACCEPTED)
/* We want a second accept to indicate EOF. */
ctx->max_accepts = 1;
else
ctx->max_accepts = -1;
ctx->input_fd = ASSUAN_INVALID_FD;
ctx->output_fd = ASSUAN_INVALID_FD;
ctx->inbound.fd = ASSUAN_INVALID_FD;
ctx->outbound.fd = ASSUAN_INVALID_FD;
if (flags & ASSUAN_SOCKET_SERVER_ACCEPTED)
{
ctx->listen_fd = ASSUAN_INVALID_FD;
ctx->connected_fd = fd;
}
else
{
ctx->listen_fd = fd;
ctx->connected_fd = ASSUAN_INVALID_FD;
}
ctx->accept_handler = ((flags & ASSUAN_SOCKET_SERVER_ACCEPTED)
? accept_connection_bottom
: accept_connection);
ctx->finish_handler = _assuan_server_finish;
if (flags & ASSUAN_SOCKET_SERVER_FDPASSING)
_assuan_init_uds_io (ctx);
rc = _assuan_register_std_commands (ctx);
if (rc)
_assuan_reset (ctx);
return TRACE_ERR (rc);
}
/* Save a copy of NONCE in context CTX. This should be used to
register the server's nonce with an context established by
assuan_init_socket_server. */
void
assuan_set_sock_nonce (assuan_context_t ctx, assuan_sock_nonce_t *nonce)
{
if (ctx && nonce)
ctx->listen_nonce = *nonce;
}

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Expires
Sun, Feb 23, 7:28 PM (1 d, 31 m)
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