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/* $OpenBSD: mda_unpriv.c,v 1.2 2018/06/04 15:57:46 gilles Exp $ */
/*
* Copyright (c) 2018 Gilles Chehade <gilles@poolp.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/tree.h>
#include <sys/socket.h>
#include <err.h>
#include <errno.h>
#include <event.h>
#include <imsg.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include "smtpd.h"
void
mda_unpriv(struct dispatcher *dsp, struct deliver *deliver,
const char *pw_name, const char *pw_dir)
{
int idx;
char *mda_environ[10];
char mda_exec[LINE_MAX];
char mda_wrapper[LINE_MAX];
const char *mda_command;
const char *mda_command_wrap;
const char *extension;
if (deliver->mda_exec[0])
mda_command = deliver->mda_exec;
else
mda_command = dsp->u.local.command;
if (strlcpy(mda_exec, mda_command, sizeof (mda_exec))
>= sizeof (mda_exec))
err(1, "mda command line too long");
if (! mda_expand_format(mda_exec, sizeof mda_exec, deliver,
&deliver->userinfo, NULL))
err(1, "mda command line could not be expanded");
mda_command = mda_exec;
/* setup environment similar to other MTA */
idx = 0;
xasprintf(&mda_environ[idx++], "PATH=%s", _PATH_DEFPATH);
xasprintf(&mda_environ[idx++], "DOMAIN=%s", deliver->rcpt.domain);
xasprintf(&mda_environ[idx++], "HOME=%s", pw_dir);
xasprintf(&mda_environ[idx++], "RECIPIENT=%s@%s", deliver->dest.user, deliver->dest.domain);
xasprintf(&mda_environ[idx++], "SHELL=/bin/sh");
xasprintf(&mda_environ[idx++], "LOCAL=%s", deliver->rcpt.user);
xasprintf(&mda_environ[idx++], "LOGNAME=%s", pw_name);
xasprintf(&mda_environ[idx++], "USER=%s", pw_name);
if ((extension = strchr(deliver->rcpt.user, *env->sc_subaddressing_delim)) != NULL)
if (strlen(extension+1))
xasprintf(&mda_environ[idx++], "EXTENSION=%s", extension+1);
mda_environ[idx++] = (char *)NULL;
if (dsp->u.local.mda_wrapper) {
mda_command_wrap = dict_get(env->sc_mda_wrappers,
dsp->u.local.mda_wrapper);
if (mda_command_wrap == NULL)
err(1, "could not find wrapper %s",
dsp->u.local.mda_wrapper);
if (strlcpy(mda_wrapper, mda_command_wrap, sizeof (mda_wrapper))
>= sizeof (mda_wrapper))
err(1, "mda command line too long");
if (! mda_expand_format(mda_wrapper, sizeof mda_wrapper, deliver,
&deliver->userinfo, mda_command))
err(1, "mda command line could not be expanded");
mda_command = mda_wrapper;
}
execle("/bin/sh", "/bin/sh", "-c", mda_command, (char *)NULL,
mda_environ);
perror("execle");
_exit(1);
}
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