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/*
* $Id: cap_proc.c,v 1.1.1.1.4.4 2001/01/16 07:38:25 agmorgan Exp $
*
* Copyright (c) 1997-8 Andrew G Morgan <morgan@linux.kernel.org>
*
* This file deals with setting capabilities on processes.
*/
#include "libcap.h"
static void _libcap_cappid(cap_t cap_d, pid_t pid)
{
cap_d->head.version = _libcap_kernel_version;
_cap_debug("version: %x, features: %x\n",
cap_d->head.version, cap_d->features);
#if (_LINUX_CAPABILITY_VERSION == 0x19980330)
if (_libcap_kernel_version == 0x19980330) {
cap_d->head.pid = pid;
}
_cap_debug("pid: %d\n", cap_d->head.pid);
#else /* holds for 0x20000603 and 0x20010113 */
if (_libcap_kernel_version == 0x19980330) {
cap_d->head.type = pid; /* a backward compatibility hack */
} else {
cap_d->head.type = CAP_USERHEADER_PID;
cap_d->head.u.pid = pid;
}
_cap_debug("type: %d\npid: %d\n", cap_d->head.type, cap_d->head.u.pid);
#endif
_cap_debugcap("effective = ", &cap_d->set.effective);
_cap_debugcap("inheritable = ", &cap_d->set.inheritable);
_cap_debugcap("permitted = ", &cap_d->set.permitted);
}
cap_t cap_get_proc(void)
{
cap_t result;
/* allocate a new capability set */
result = cap_init();
if (result) {
_cap_debug("getting current process' capabilities");
_libcap_cappid(result, 0);
/* fill the capability sets via a system call */
if (capget(&result->head, &result->set)) {
cap_free(result);
result = NULL;
}
}
if (result && (_libcap_kernel_features & CAP_FEATURE_TO_32)) {
if (_libcap_n1_to_n2(result, 1, __CAP_BLKS)) {
cap_free(result);
result = NULL;
}
}
return result;
}
int cap_set_proc(cap_t cap_d)
{
int retval;
if (!good_cap_t(cap_d)) {
errno = EINVAL;
return -1;
}
if (_libcap_kernel_features & CAP_FEATURE_TO_32) {
retval = _libcap_n1_to_n2(cap_d, __CAP_BLKS, 1);
}
_cap_debug("setting process capabilities");
_libcap_cappid(cap_d, 0);
retval = capset(&cap_d->head, &cap_d->set);
if (_libcap_kernel_features & CAP_FEATURE_TO_32) {
(void) _libcap_n1_to_n2(cap_d, 1, __CAP_BLKS);
}
return retval;
}
/* the following functions are not required by POSIX */
/* read the caps on a specific process */
int capgetp(pid_t pid, cap_t cap_d)
{
int error;
if (!good_cap_t(cap_d)) {
_cap_debug("failed check for good cap_t");
errno = EINVAL;
return -1;
}
_cap_debug("getting process capabilities for proc %d", pid);
_libcap_cappid(cap_d, pid);
error = capget(&cap_d->head, &cap_d->set);
_libcap_cappid(cap_d, 0);
if ((!error) && (_libcap_kernel_features & CAP_FEATURE_TO_32)) {
if (_libcap_n1_to_n2(cap_d, 1, __CAP_BLKS)) {
cap_free(cap_d);
cap_d = NULL;
error = -1;
}
}
return error;
}
#ifdef CAP_USERHEADER_X_WITH_E
static int map_cap_flag(cap_flag_t set, int *flavor)
{
switch (set) {
case CAP_EFFECTIVE:
*flavor = CAP_USERHEADER_X_WITH_E;
break;
case CAP_INHERITABLE:
*flavor = CAP_USERHEADER_X_WITH_I;
break;
case CAP_PERMITTED:
*flavor = CAP_USERHEADER_X_WITH_P;
break;
default:
_cap_debug("illegal cap_flag_t = %d", set);
return 0;
}
return 1;
}
/* get the current cap_bset */
cap_t cap_get_bound(cap_flag_t set)
{
int cap_flavor;
cap_t result;
if (!map_cap_flag(set, &cap_flavor)) {
errno = EINVAL;
return NULL;
}
/* allocate a new capability set */
result = cap_init();
if (result) {
_cap_debug("getting current process' bounding set");
result->head.type = cap_flavor;
/* fill the capability sets via a system call */
if (capget(&result->head, &result->set)) {
cap_free(result);
result = NULL;
}
}
return result;
}
/* set the current cap_bset */
int cap_set_bound(cap_t cap_d, cap_flag_t set)
{
int cap_flavor;
if (!good_cap_t(cap_d)) {
errno = EINVAL;
return -1;
}
if (!map_cap_flag(set, &cap_flavor)) {
errno = EINVAL;
return -1;
}
_cap_debug("setting current process' bounding set");
cap_d->head.type = cap_flavor;
return capset(&cap_d->head, &cap_d->set);
}
#endif /* CAP_USERHEADER_X_WITH_E */
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