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/*
* $Id: cap_file.c,v 1.1.1.1.4.3 2001/01/16 07:38:25 agmorgan Exp $
*
* Copyright (c) 1997-2000 Andrew G Morgan <morgan@linux.kernel.org>
*
* This file deals with setting capabilities on files.
*/
#include "libcap.h"
#if (_LINUX_CAPABILITY_VERSION == 0x19980330)
/* This kernel does not support filesystem capabilities later ones do */
cap_t cap_get_fd(int fildes)
{
_cap_debug("compilation does not support filecaps");
errno = ENOSYS;
return NULL;
}
cap_t cap_get_file(const char *filename)
{
_cap_debug("compilation does not support filecaps");
errno = ENOSYS;
return NULL;
}
int cap_set_fd(int fildes, cap_t cap_d)
{
_cap_debug("compilation does not support filecaps");
errno = ENOSYS;
return -1;
}
int cap_set_file(const char *filename, cap_t cap_d)
{
_cap_debug("compilation does not support filecaps");
errno = ENOSYS;
return -1;
}
#else /* ie. (_LINUX_CAPABILITY_VERSION != 0x19980330) */
/*
* attempt to have defined behavior when running with an older kernel
*/
static int _libcap_capfile(cap_t cap_d)
{
cap_d->head.version = _libcap_kernel_version;
_cap_debug("version: %x, features: %x",
cap_d->head.version, cap_d->features);
if (cap_d->features & CAP_FEATURE_FILE) {
_cap_debug("ok");
return 0;
} else {
_cap_debug("library compiled with a kernel not supporting filecaps");
errno = ENOSYS;
return -1;
}
}
/*
* Get the capabilities of an open file, as specified by its file
* descriptor.
*/
cap_t cap_get_fd(int fildes)
{
int retval;
cap_t result;
/* allocate a new capability set */
result = cap_init();
if (result == NULL) {
_cap_debug("failed to allocate a result");
return NULL;
}
if (_libcap_capfile(result)) {
_cap_debug("running kernel has no support for filecaps");
goto fail;
}
result->head.type = CAP_USERHEADER_FILEDES;
result->head.u.fd = fildes;
retval = capget(&result->head, &result->set);
result->head.type = 0;
result->head.u.pid = 0;
if (!retval) {
if (_libcap_kernel_features & CAP_FEATURE_TO_32) {
if (_libcap_n1_to_n2(result, 1, __CAP_BLKS)) {
goto fail;
}
}
return result;
}
fail:
cap_free(result);
result = NULL;
return NULL;
}
/*
* Set the capabilities on a named file.
*/
cap_t cap_get_file(const char *filename)
{
int retval;
cap_t result;
/* allocate a new capability set */
result = cap_init();
if (result == NULL) {
_cap_debug("failed to allocate a result");
return NULL;
}
if (_libcap_capfile(result)) {
_cap_debug("running kernel has no support for filecaps");
goto fail;
}
result->head.type = CAP_USERHEADER_FILE;
result->head.u.file = filename;
retval = capget(&result->head, &result->set);
result->head.type = 0;
result->head.u.pid = 0;
if (!retval) {
if (_libcap_kernel_features & CAP_FEATURE_TO_32) {
if (_libcap_n1_to_n2(result, 1, __CAP_BLKS)) {
goto fail;
}
}
return result;
}
fail:
cap_free(result);
result = NULL;
return NULL;
}
/*
* Set the capabilities of an open file, as specified by its file
* descriptor.
*/
int cap_set_fd(int fildes, cap_t cap_d)
{
int retval;
if (!good_cap_t(cap_d)) {
errno = EINVAL;
return -1;
}
if (_libcap_capfile(cap_d)) {
_cap_debug("running kernel has no support for filecaps");
return -1;
}
cap_d->head.type = CAP_USERHEADER_FILEDES;
cap_d->head.u.fd = fildes;
if (_libcap_kernel_features & CAP_FEATURE_TO_32) {
retval = _libcap_n1_to_n2(cap_d, __CAP_BLKS, 1);
}
retval = capset(&cap_d->head, &cap_d->set);
_cap_debug("capset returned %d", retval);
if (_libcap_kernel_features & CAP_FEATURE_TO_32) {
(void) _libcap_n1_to_n2(cap_d, 1, __CAP_BLKS);
}
cap_d->head.type = 0;
cap_d->head.u.pid = 0;
return retval;
}
/*
* Set the capabilities of a named file.
*/
int cap_set_file(const char *filename, cap_t cap_d)
{
int retval;
if (!good_cap_t(cap_d)) {
errno = EINVAL;
return -1;
}
if (_libcap_capfile(cap_d)) {
_cap_debug("running kernel has no support for filecaps");
return -1;
}
cap_d->head.type = CAP_USERHEADER_FILE;
cap_d->head.u.file = filename;
if (_libcap_kernel_features & CAP_FEATURE_TO_32) {
retval = _libcap_n1_to_n2(cap_d, __CAP_BLKS, 1);
}
_cap_debug("capset version 0x%x", cap_d->head.version);
_cap_debug("capset type %d", cap_d->head.type);
retval = capset(&cap_d->head, &cap_d->set);
_cap_debug("capset returned %d", retval);
if (_libcap_kernel_features & CAP_FEATURE_TO_32) {
(void) _libcap_n1_to_n2(cap_d, 1, __CAP_BLKS);
}
cap_d->head.type = 0;
cap_d->head.u.pid = 0;
return retval;
}
#endif /* (_LINUX_CAPABILITY_VERSION == 0x19980330) */
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