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* Add fsetxattr(), fremovexattr(), open_by_handle_at(), and "virtiofsd demo"HEADmasterStefano Brivio2024-05-152-10/+28
| | | | | | | | Mostly assorted fixes, a new FDGET operation (get a copy of the target file descriptor via pidfd_getfd()) and a new "FD" flag that means we have to do that on direct tag reference. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* seitan: Add netlink, sendto()/sendmsg(), iovec handling, demo with routesStefano Brivio2023-12-213-2/+37
| | | | | | | A bit rough at the moment, but it does the trick. Bonus: setsockopt() (with magic values only, not used in any demo yet). Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* gluten: throw an error if the offset is seccomp but the request is emptyAlice Frosi2023-09-081-1/+3
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* cooker, seitan: add sched_setschedulerAlice Frosi2023-09-012-13/+24
| | | | | | | | | | The sched_setscheduler requires to set the pid of the process we want to change the priority, this adds a new metadata for getting the target pid at runtime. Add a couple of syscalls for the scheduler in the string parsing. Signed-off-by: Alice Frosi <afrosi@redhat.com>
* seitan: small fixesAlice Frosi2023-08-311-0/+8
| | | | | | Fixes: - return an error message in do_clone instead of exit - check if the type of context is out-of-bound
* cooker: simplify tag and add caller metadataAlice Frosi2023-08-302-2/+13
| | | | | | | | | | | | Group the metadata information: - simplify the json by removing the 'tag' and only using 'get' and 'set' keys - get uid and gid at runtime for the target ('caller'). This can be useful when the the UID and GID of the target are only known at runtime and they need to be used for setting the permissions of files - updated example demo/mknod.hjson Signed-off-by: Alice Frosi <afrosi@redhat.com>
* common: print syscall name based on the numberAlice Frosi2023-08-302-1/+18
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* cooker: generate OCI seccomp profileAlice Frosi2023-08-241-0/+1
| | | | | | | | | | | | | | | | | | Generate the OCI seccomp profile instead of directly the BPF filter. The seccomp profile will be used consquently by the container runtime as input in order to generate the BPF filter. Example with mknod: $ seitan-cooker -g /tmp/gluten -p /tmp/scmp_prof.json -s seccomp.json -i demo/mknod.hjson $ seitan -s /tmp/seitan.sock -i /tmp/gluten $ podman run --cap-drop ALL --security-opt=seccomp=/tmp/scmp_prof.json \ --annotation run.oci.seccomp.receiver=/tmp/seitan.sock \ -ti fedora \ sh -c 'mknod /dev/lol c 1 7 && ls /dev/lol' /dev/lol Signed-off-by: Alice Frosi <afrosi@redhat.com>
* common, ops: add error print and return if desc is emptyAlice Frosi2023-07-141-1/+6
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* test: fix filter-build test and bugsAlice Frosi2023-07-031-1/+0
| | | | | | | | | | | | The tests for checking the filter build recompile and are successfull. Changes: - spotted a couple of bugs for adding the arguments in the filter - readded function `filter_flush_args` to flush_args; this is needed to distinguish when the arguments belong to the same block or are different entries to the same syscall - build the filter in a way that CMP_EQ corresponds to BPF_JEQ and we don't need to awkwardly negate the operations (still TODO for AND_EQ)
* cooker, seitan: Add support for GID/UID in contextStefano Brivio2023-06-282-10/+26
| | | | | | | | | | Similarly to namespace specifications, the special value "caller", as well as login/group names and numeric UID/GIDs are supported. Example of usage in demo/mknod.hjson. Light on checks and with some TODOs left behind at the moment. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* common: move cmp_type_str in utilAlice Frosi2023-06-282-1/+6
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* cooker: Fix up debugging messages for "return"Stefano Brivio2023-06-141-1/+1
| | | | Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* cooker: Support for read(), OP_STORE, field-based filtersStefano Brivio2023-06-141-0/+8
| | | | Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* gluten: remove unused blk opAlice Frosi2023-06-121-1/+0
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* seitan,cooker: add wd to change work directory and mknodAlice Frosi2023-06-092-41/+39
| | | | | | | | | | | | | | | | | ./seitan-cooker demo/mknod.hjson demo/mknod.gluten demo/mknod.bpf Start seitan with the socket option: ./seitan -s /tmp/seitan.sock -i demo/mknod.gluten Start the container: sudo rm -f /dev/lol sudo chown $USER:$USER /tmp/seitan.sock podman run -ti --runtime /usr/bin/crun \ --security-opt label=disable \ -v $(pwd)/test:/test \ --annotation run.oci.seccomp_bpf_data="$(base64 -w0 demo/mknod.bpf)" \ --annotation run.oci.seccomp.receiver=/tmp/seitan.sock fedora \ sh -c 'mknod /dev/lol c 1 7 && ls -l /dev/lol'
* cooker: Full support for flags and masks, assorted fixesStefano Brivio2023-06-081-1/+1
| | | | Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* mknod/mknodat values, initial support for MASK flag, OP_BITWISEStefano Brivio2023-06-072-7/+21
| | | | Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* seitan, cooker: refactor op_returnAlice Frosi2023-06-071-3/+7
| | | | | | | Refactor OP_RETURN: - merged OP_BLOCK and OP_CONT into OP_RETURN - add desc field for op_return - updated the demo files
* seitan,cooker: op_resolvefdAlice Frosi2023-06-071-6/+9
| | | | | | | | | ops: - update resolvefd with the description - add debug prints cooker: - add emit_resolvefd when match has type FDPATH
* cooker: Draft quality: mknod/mknodat, sets of values with "in"Stefano Brivio2023-06-061-3/+20
| | | | | | | | While at it: - directly assign 'fd' in eater from install_filter() - turn op_cmp into a description-style thing Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* treewide: Change to GPLv2, add LICENSES, missing headersStefano Brivio2023-06-045-4/+21
| | | | | | As discussed with Alice -- 'reuse lint' passes now. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* cooker, seitan: OP_FDStefano Brivio2023-06-021-6/+12
| | | | Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* cooker, seitan: OP_CALL arguments and contextStefano Brivio2023-06-022-54/+89
| | | | Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* cooker: OP_CALL and OP_COPY stuffStefano Brivio2023-06-012-10/+14
| | | | | | ...mostly. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* ops: adjust op_callAlice Frosi2023-06-012-5/+13
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* ops: fix op_call and testsAlice Frosi2023-05-191-2/+8
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* ops: add op_nr and op_copyAlice Frosi2023-05-171-0/+8
| | | | | | | Add: - missing implementation for op_nr - op_copy to copy data - tests for op_nr and op_data
* cooker, seitan: Now with 100% more glutenStefano Brivio2023-05-162-3/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pseudorandom changes and progress around cooker and seitan: - cooker: - rename matching functions, split match.c - fix up SELECT semantics - add some form of handling for all syscalls in the example (some stubs) - OP_CMP for all basic and compound types except for flags - link jumps to next block and next match - completed implementation of tags - gluten write - filter clean-ups, write filters (probably not working) - seitan: - load gluten and source instructions and data from there $ ./seitan-cooker cooker/example.hjson example.gluten example.bpf Parsing block 0 Parsing match 0: connect Found description for connect 0: OP_NR: if syscall number is not 0, jump to next block Parsing match argument fd setting tag reference 'fd' tag 'fd' now refers to seccomp data at 0 Parsing match argument addr allocating 128 at offset 0 1: OP_LOAD: #0 < args[1] (size: 128) C#0: (INT) 1 2: OP_CMP: if temporary data: #0 NE (size: 4) read-only data: #0, jump to next block C#4: (STRING:24) /var/run/pr-helper.sock 3: OP_CMP: if temporary data: #0 NE (size: 24) read-only data: #4, jump to next block Linking match... Linking block... linked jump of instruction #0 to #4 linked jump of instruction #2 to #4 linked jump of instruction #3 to #4 Parsing block 1 Parsing match 0: ioctl Found description for ioctl 4: OP_NR: if syscall number is not 112, jump to next block Parsing match argument path Parsing match argument request C#28: (INT) 1074025674 5: OP_CMP: if seccomp data: #1 NE (size: 4) read-only data: #28, jump to next block Parsing match argument ifr allocating 40 at offset 128 6: OP_LOAD: #128 < args[2] (size: 40) C#32: (STRING:5) tap0 7: OP_CMP: if temporary data: #128 NE (size: 5) read-only data: #32, jump to next block C#37: (INT) 1 8: OP_CMP: if temporary data: #128 NE (size: 4) read-only data: #37, jump to next block Linking match... Linking block... linked jump of instruction #4 to #9 linked jump of instruction #5 to #9 linked jump of instruction #7 to #9 linked jump of instruction #8 to #9 Parsing block 2 Parsing match 0: unshare Found description for unshare 9: OP_NR: if syscall number is not 164, jump to next block Parsing match argument flags Linking match... Linking block... linked jump of instruction #9 to #10 Parsing block 3 Parsing match 0: unshare Found description for unshare 10: OP_NR: if syscall number is not 164, jump to next block Parsing match argument flags Linking match... Linking block... linked jump of instruction #10 to #11 Parsing block 4 Parsing match 0: mknod Found description for mknod 11: OP_NR: if syscall number is not 164, jump to next block Parsing match argument path allocating 1 at offset 168 12: OP_LOAD: #168 < args[0] (size: 1) setting tag reference 'path' tag 'path' now refers to temporary data at 168 Parsing match argument mode Parsing match argument major Parsing match argument minor setting tag reference 'minor' tag 'minor' now refers to seccomp data at 2 Linking match... Linking block... linked jump of instruction #11 to #13 Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* Adjust op_call with gluten_offsetAlice Frosi2023-05-111-13/+11
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* gluten: remove unused enum value_typeAlice Frosi2023-05-111-5/+0
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* Clean-up error message and testAlice Frosi2023-05-111-0/+12
| | | | | | | | Refactoring error messages: - standardize error messages and functions - return on error instead of exit - test error when target doesn't exist - include ability to capture stderr and stdout in the tests
* ops: check for SECCOMP_DATAAlice Frosi2023-05-101-0/+3
| | | | Add check if offset type is SECCOMP_DATA and the seccomp request is set.
* Refactoring of gluten_read/writeAlice Frosi2023-05-101-26/+34
| | | | | | | | Refactor includes: - use static inline instead of macro - return -1 if there is an error and don't exit - eval return 0 or -1 - adjust code and tests
* gluten: check limitsAlice Frosi2023-05-091-3/+45
| | | | | | Add bounds checking: - if offset is larger then the maximum per offset type - if memcpy is reading/writing inside gluten
* seitan: refactor operationsAlice Frosi2023-05-081-25/+21
| | | | | | | | | | | Refactoring: - rename do_operations to eval and reduce the number of arguments - create macro HANDLE_OP - rename all functions with op_*(operation name) - exposed the op_* functions in the operations.h Fixes: - use pread for op_load
* cooker updates spilling all over the placeStefano Brivio2023-05-022-30/+224
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Only tangentially related: - make seitan C99 again, so that I can build cooker without warnings - make Makefiles make use of the usual conventions about assigning directory paths in variables, drop numbers.h as requirement for cooker and make it convenient to run stand-alone Makefiles - fix up nr_syscalls.sh to be POSIX, otherwise it will give syntax errors on my system - define a single, common way to refer to offsets in gluten, and functions to use those offsets in a safe way. Immediates are gone: cooker will write any bit of "data" to the read-only section - call const what has to be const - define on-disk layout for gluten - add OP_NR (to check syscall numbers), rename OP_COPY_ARGS to OP_LOAD (it loads _selected_ stuff from arguments) As for cooker itself: - drop ARG_ and arg_ prefixes from struct names, and similar - add/rework functions to build OP_NR, OP_LOAD, OP_CMP, and to write constant data to gluten - add parsing for "compound" arguments, but that's not completely hooked into evaluation for numeric arguments yet Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* Add op_cmp typeAlice Frosi2023-04-211-0/+10
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* Create common function to install the BPF filterAlice Frosi2023-03-302-1/+33
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* Move util.h and util.c in commonAlice Frosi2023-03-242-0/+51
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* Re-arrange repository structureAlice Frosi2023-03-243-0/+195
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