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/** @file
A brief file description
@section license License
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
# include "ink_config.h"
# include "Diags.h"
# include "ink_cap.h"
# if TS_USE_POSIX_CAP
# include <sys/capability.h>
# include <sys/prctl.h>
# endif
void
DebugCapabilities(char const* tag) {
if (is_debug_tag_set(tag)) {
# if TS_USE_POSIX_CAP
cap_t caps = cap_get_proc();
char* caps_text = cap_to_text(caps, 0);
# endif
Debug(tag,
"uid=%u, gid=%u, euid=%u, egid=%u"
# if TS_USE_POSIX_CAP
", caps %s thread 0x%x"
# endif
,static_cast<unsigned int>(getuid())
,static_cast<unsigned int>(getgid())
,static_cast<unsigned int>(geteuid())
,static_cast<unsigned int>(getegid())
# if TS_USE_POSIX_CAP
,caps_text
,pthread_self()
# endif
);
# if TS_USE_POSIX_CAP
cap_free(caps_text);
cap_free(caps);
# endif
}
}
int
PreserveCapabilities() {
int zret = 0;
# if TS_USE_POSIX_CAP
zret = prctl(PR_SET_KEEPCAPS, 1);
# endif
return zret;
}
// Adjust the capabilities to only those needed.
int
RestrictCapabilities() {
int zret = 0; // return value.
# if TS_USE_POSIX_CAP
cap_t caps = cap_init(); // start with nothing.
// Capabilities we need.
cap_value_t cap_list[] = { CAP_NET_ADMIN, CAP_NET_BIND_SERVICE, CAP_IPC_LOCK };
static int const CAP_COUNT = sizeof(cap_list)/sizeof(*cap_list);
cap_set_flag(caps, CAP_PERMITTED, CAP_COUNT, cap_list, CAP_SET);
cap_set_flag(caps, CAP_EFFECTIVE, CAP_COUNT, cap_list, CAP_SET);
zret = cap_set_proc(caps);
cap_free(caps);
# endif
return zret;
}
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