04e9edb544
These programs parse ND6 Router Advertisement messages; rtsold(8) has required an SA, SA-14:20.rtsold, for a bug in this code. Thus, they are good candidates for sandboxing. The approach taken is to run the main executable in capability mode and use Casper services to provide functionality that cannot be implemented within the sandbox. In particular, several custom services were required. - A Casper service is used to send Router Solicitation messages on a raw ICMP6 socket. Initially I took the approach of creating a socket for each interface upon startup, and connect(2)ing it to the all-routers multicast group for the interface. This permits the use of sendmsg(2) in capability mode, but only works if the interface's link is up when rtsol(d) starts. So, instead, the rtsold.sendmsg service is used to transmit RS messages on behalf of the main process. One could alternately define a service which simply creates and connects a socket for each destination address, and returns the socket to the sandboxed process. However, to implement rtsold's -m option we also need to read the ND6 default router list, and this cannot be done in capability mode. - rtsold may execute resolvconf(8) in response to RDNSS and DNSSL options in received RA messages. A Casper service is used to fork and exec resolvconf(8), and to reap the child process. - A service is used to determine whether a given interface's link-local address is useable (i.e., not duplicated or undergoing DAD). This information is supplied by getifaddrs(3), which reads a sysctl not available in capability mode. The SIOCGIFCONF socket ioctl provides equivalent information and can be used in capability mode, but I decided against it for now because of some limitations of that interface. In addition to these new services, cap_syslog(3) is used to send messages to syslogd. Reviewed by: oshogbo Tested by: bz (previous versions) MFC after: 2 months Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D17572 |
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| bin | ||
| cddl | ||
| contrib | ||
| crypto | ||
| etc | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| lib | ||
| libexec | ||
| release | ||
| rescue | ||
| sbin | ||
| secure | ||
| share | ||
| stand | ||
| sys | ||
| targets | ||
| tests | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| .arcconfig | ||
| .arclint | ||
| .gitattributes | ||
| .gitignore | ||
| COPYRIGHT | ||
| LOCKS | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc1 | ||
| Makefile.libcompat | ||
| Makefile.sys.inc | ||
| ObsoleteFiles.inc | ||
| README | ||
| README.md | ||
| UPDATING | ||
FreeBSD Source:
This is the top level of the FreeBSD source directory. This file
was last revised on:
FreeBSD
FreeBSD is an operating system used to power modern servers, desktops, and embedded platforms. A large community has continually developed it for more than thirty years. Its advanced networking, security, and storage features have made FreeBSD the platform of choice for many of the busiest web sites and most pervasive embedded networking and storage devices.
For copyright information, please see the file COPYRIGHT in this directory. Additional copyright information also exists for some sources in this tree - please see the specific source directories for more information.
The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree. See build(7), config(8), https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html, and https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html for more information, including setting make(1) variables.
Source Roadmap:
bin System/user commands.
cddl Various commands and libraries under the Common Development
and Distribution License.
contrib Packages contributed by 3rd parties.
crypto Cryptography stuff (see crypto/README).
etc Template files for /etc.
gnu Various commands and libraries under the GNU Public License.
Please see gnu/COPYING* for more information.
include System include files.
kerberos5 Kerberos5 (Heimdal) package.
lib System libraries.
libexec System daemons.
release Release building Makefile & associated tools.
rescue Build system for statically linked /rescue utilities.
sbin System commands.
secure Cryptographic libraries and commands.
share Shared resources.
stand Boot loader sources.
sys Kernel sources.
sys/<arch>/conf Kernel configuration files. GENERIC is the configuration
used in release builds. NOTES contains documentation of
all possible entries.
tests Regression tests which can be run by Kyua. See tests/README
for additional information.
tools Utilities for regression testing and miscellaneous tasks.
usr.bin User commands.
usr.sbin System administration commands.
For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see:
https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/current-stable.html