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afa1e02c57
* Fix mistake in always_true macro
comparison operator was wrong.
* Whitespace diffs
* Add opt-in rules for interp procs + networking
New rules "Interpreted procs inbound network activity" and "Interpreted
procs outbound network activity" check for any network activity being
done by interpreted programs like ruby, python, etc. They aren't enabled
by default, as there are many legitimate cases where these programs
might perform inbound or outbound networking. Macros
"consider_interpreted_inbound" and "consider_interpreted_outbound" can
be used to enable them.
* Opt-in rule for running network tools on host
New rule Lauch Suspicious Network Tool on Host is similar to "Lauch
Suspicious Network Tool in Container" [sic] but works on the host. It's
not enabled by default, but can be enabled using the macro
consider_network_tools_on_host.
* Add parens around container macro
* Make Modify User Context generic to shell configs
Rename Modify User Context to Modify Shell Configuration File to note
that it's limited to shell configuration files, and expand the set of
files to cover a collection of file names and files for zsh, csh, and
bash.
* Also prevent shells from directly opening conns
Bash can directly open network connections by writing to
/dev/{tcp,udp}/<addr>/<port>. These aren't actual files, but are
interpreted by bash as instructions to open network connections.
* Add rule to detect shell config reads
New rule Read Shell Configuration File is analogous to Write Shell
Configuration File, but handles reads by programs other than shell
programs. It's also disabled by default using consider_shell_config_reads.
* Add rule to check ssh directory/file reads
New rule Read ssh information looks for any open of a file or directory
below /root/.ssh or a user ssh directory. ssh binaries (new list
ssh_binaries) are excluded.
The rule is also opt-in via the macro consider_ssh_reads.
* Rule to check for disallowed ssh proxies
New rule "Program run with disallowed http proxy env" looks for spawned
programs that have a HTTP_PROXY environment variable, but the value of
the HTTP_PROXY is not an expected value.
This handles attempts to redirect traffic to unexpected locations.
* Add rules showing how to categorize outbound conns
New rules Unexpected outbound connection destination and Unexpected
outbound connection source show how to categorize network connections by
either destination or source ip address, netmask, or domain name.
In order to be effective, they require a comprehensive set of allowed
sources and/or destinations, so they both require customization and are
gated by the macro consider_all_outbound_conns.
* Add .bash_history to bash config files
* Restrict http proxy rule to specific procs
Only considering wget, curl for now.
* Shell programs can directly modify config
Most notably .bash_history.
* Use right system_procs/binaries
system_binaries doesn't exist, so use system_procs + an additional test
for shell_binaries.