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/*-
* Copyright 2018 UPLEX - Nils Goroll Systemoptimierung
* All rights reserved.
*
* Authors: Geoffrey Simmons <geoffrey.simmons@uplex.de>
*
* SPDX-License-Identifier: BSD-2-Clause
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "config.h"
#include <pwd.h>
#include <grp.h>
#include <string.h>
#include "cache/cache.h"
#include "vcl.h"
#include "common/heritage.h"
#include "vmod_unix_cred_compat.h"
#include "vcc_unix_if.h"
#define FAIL(ctx, msg) \
VRT_fail((ctx), "vmod unix failure: " msg)
#define ERR(ctx, msg) \
VSLb((ctx)->vsl, SLT_VCL_Error, "vmod unix error: " msg)
#define VERR(ctx, fmt, ...) \
VSLb((ctx)->vsl, SLT_VCL_Error, "vmod unix error: " fmt, __VA_ARGS__)
#define ERRNOTUDS(ctx) \
ERR((ctx), "not listening on a Unix domain socket")
#define FAIL_SUPPORT(ctx) \
FAIL((ctx), "not supported on this platform")
#define ERRNOCREDS(ctx) \
VERR((ctx), "could not read peer credentials: %s", strerror(errno))
#define ERRNOMEM(ctx) \
ERR((ctx), "out of space")
static struct sess *
get_sp(VRT_CTX)
{
struct sess *sp;
CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
if (ctx->req) {
CHECK_OBJ(ctx->req, REQ_MAGIC);
sp = ctx->req->sp;
} else {
CHECK_OBJ_NOTNULL(ctx->bo, BUSYOBJ_MAGIC);
sp = ctx->bo->sp;
}
CHECK_OBJ_NOTNULL(sp, SESS_MAGIC);
CHECK_OBJ_NOTNULL(sp->listen_sock, LISTEN_SOCK_MAGIC);
return (sp);
}
#define NUM_FUNC(func) \
VCL_INT \
vmod_##func(VRT_CTX) \
{ \
struct sess *sp; \
uid_t uid; \
gid_t gid; \
int ret; \
\
CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC); \
AZ(ctx->method & VCL_MET_TASK_H); \
\
sp = get_sp(ctx); \
if (!sp->listen_sock->uds) { \
ERRNOTUDS(ctx); \
return (-1); \
} \
\
ret = get_ids(sp->fd, &uid, &gid); \
if (ret == 0) \
return (func); \
\
if (ret == NOT_SUPPORTED) \
FAIL_SUPPORT(ctx); \
else if (ret == CREDS_FAIL) \
ERRNOCREDS(ctx); \
return (-1); \
}
NUM_FUNC(uid)
NUM_FUNC(gid)
#define NAME_FUNC(func, type, get, id, fld) \
VCL_STRING \
vmod_##func(VRT_CTX) \
{ \
struct type *s; \
VCL_INT ret; \
VCL_STRING name; \
\
CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC); \
ret = vmod_##id(ctx); \
if (ret == -1) \
return (NULL); \
\
errno = 0; \
s = get((id##_t) ret); \
if (s == NULL) { \
ERRNOCREDS(ctx); \
return (NULL); \
} \
if ((name = WS_Copy(ctx->ws, s->fld, -1)) == NULL) { \
ERRNOMEM(ctx); \
return (NULL); \
} \
return (name); \
}
NAME_FUNC(user, passwd, getpwuid, uid, pw_name)
NAME_FUNC(group, group, getgrgid, gid, gr_name)
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