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rules: add support to openat2 in default ruleset #1796

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Dec 6, 2021
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rules: add support to openat2 in default ruleset #1796

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10 changes: 5 additions & 5 deletions rules/falco_rules.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -29,13 +29,13 @@
# condition: (syscall.type=read and evt.dir=> and fd.type in (file, directory))

- macro: open_write
condition: (evt.type=open or evt.type=openat) and evt.is_open_write=true and fd.typechar='f' and fd.num>=0
condition: evt.type in (open,openat,openat2) and evt.is_open_write=true and fd.typechar='f' and fd.num>=0

- macro: open_read
condition: (evt.type=open or evt.type=openat) and evt.is_open_read=true and fd.typechar='f' and fd.num>=0
condition: evt.type in (open,openat,openat2) and evt.is_open_read=true and fd.typechar='f' and fd.num>=0

- macro: open_directory
condition: (evt.type=open or evt.type=openat) and evt.is_open_read=true and fd.typechar='d' and fd.num>=0
condition: evt.type in (open,openat,openat2) and evt.is_open_read=true and fd.typechar='d' and fd.num>=0

- macro: never_true
condition: (evt.num=0)
Expand Down Expand Up @@ -2295,7 +2295,7 @@
desc: creating any files below /dev other than known programs that manage devices. Some rootkits hide files in /dev.
condition: >
fd.directory = /dev and
(evt.type = creat or ((evt.type = open or evt.type = openat) and evt.arg.flags contains O_CREAT))
(evt.type = creat or (evt.type in (open,openat,openat2) and evt.arg.flags contains O_CREAT))
and not proc.name in (dev_creation_binaries)
and not fd.name in (allowed_dev_files)
and not fd.name startswith /dev/tty
Expand Down Expand Up @@ -2986,7 +2986,7 @@
- rule: Container Drift Detected (open+create)
desc: New executable created in a container due to open+create
condition: >
evt.type in (open,openat,creat) and
evt.type in (open,openat,openat2,creat) and
evt.is_open_exec=true and
container and
not runc_writing_exec_fifo and
Expand Down
2 changes: 1 addition & 1 deletion test/rules/tagged_rules.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,7 @@
# limitations under the License.
#
- macro: open_read
condition: (evt.type=open or evt.type=openat) and evt.is_open_read=true and fd.typechar='f'
condition: evt.type in (open,openat,openat2) and evt.is_open_read=true and fd.typechar='f'

- rule: open_1
desc: open one
Expand Down