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Merge pull request #100 from draios/use-startswith

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Utilize sysdig's startswith operator.
This commit is contained in:
Mark Stemm 2016-07-11 15:04:43 -07:00 committed by GitHub
commit 022614a98d
2 changed files with 10 additions and 14 deletions
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21
rules/falco_rules.yaml
View File

@ -43,28 +43,23 @@
# File categories
- macro: terminal_file_fd
condition: fd.name=/dev/ptmx or fd.directory=/dev/pts
condition: fd.name=/dev/ptmx or fd.name startswith /dev/pts
# This really should be testing that the directory begins with these
# prefixes but sysdig's filter doesn't have a "starts with" operator
# (yet).
- macro: bin_dir
condition: fd.directory in (/bin, /sbin, /usr/bin, /usr/sbin)
- macro: bin_dir_mkdir
condition: evt.arg[0] contains /bin/ or evt.arg[0] contains /sbin/ or evt.arg[0] contains /usr/bin/ or evt.arg[0] contains /usr/sbin/
condition: evt.arg[0] startswith /bin/ or evt.arg[0] startswith /sbin/ or evt.arg[0] startswith /usr/bin/ or evt.arg[0] startswith /usr/sbin/
- macro: bin_dir_rename
condition: evt.arg[1] contains /bin/ or evt.arg[1] contains /sbin/ or evt.arg[1] contains /usr/bin/ or evt.arg[1] contains /usr/sbin/
condition: evt.arg[1] startswith /bin/ or evt.arg[1] startswith /sbin/ or evt.arg[1] startswith /usr/bin/ or evt.arg[1] startswith /usr/sbin/
# This really should be testing that the directory begins with /etc,
# but sysdig's filter doesn't have a "starts with" operator (yet).
- macro: etc_dir
condition: fd.directory contains /etc
condition: fd.name startswith /etc
- macro: ubuntu_so_dirs
condition: fd.directory contains /lib/x86_64-linux-gnu or fd.directory contains /usr/lib/x86_64-linux-gnu or fd.directory contains /usr/lib/sudo
condition: fd.name startswith /lib/x86_64-linux-gnu or fd.name startswith /usr/lib/x86_64-linux-gnu or fd.name startswith /usr/lib/sudo
- macro: centos_so_dirs
condition: fd.directory contains /lib64 or fd.directory contains /user/lib64 or fd.directory contains /usr/libexec
condition: fd.name startswith /lib64 or fd.name startswith /user/lib64 or fd.name startswith /usr/libexec
- macro: linux_so_dirs
condition: ubuntu_so_dirs or centos_so_dirs or fd.name=/etc/ld.so.cache
@ -141,7 +136,7 @@
condition: proc.name in (sendmail, sendmail-msp, postfix, procmail)
- macro: sensitive_files
condition: (fd.name contains /etc/shadow or fd.name = /etc/sudoers or fd.directory in (/etc/sudoers.d, /etc/pam.d) or fd.name = /etc/pam.conf)
condition: fd.name startswith /etc and (fd.name contains /etc/shadow or fd.name = /etc/sudoers or fd.directory in (/etc/sudoers.d, /etc/pam.d) or fd.name = /etc/pam.conf)
# Indicates that the process is new. Currently detected using time
# since process was started, using a threshold of 5 seconds.
@ -221,7 +216,7 @@
# Only let rpm-related programs write to the rpm database
- rule: write_rpm_database
desc: an attempt to write to the rpm database by any non-rpm related program
condition: open_write and not proc.name in (rpm,rpmkey,yum) and fd.directory=/var/lib/rpm
condition: open_write and not proc.name in (rpm,rpmkey,yum) and fd.name startswith /var/lib/rpm
output: "Rpm database opened for writing by a non-rpm program (command=%proc.cmdline file=%fd.name)"
priority: WARNING

3
userspace/falco/lua/parser.lua
View File

@ -236,7 +236,8 @@ local G = {
symb("<") / "<" +
symb(">") / ">" +
symb("contains") / "contains" +
symb("icontains") / "icontains";
symb("icontains") / "icontains" +
symb("startswith") / "startswith";
InOp = kw("in") / "in";
UnaryBoolOp = kw("not") / "not";
ExistsOp = kw("exists") / "exists";