Currently, filename transitions are stored separately from other type enforcement rules and only support exact name matching. However, in practice, the names contain variable parts. This leads to many duplicated rules in the policy that differ only in the part of the name, or it is even impossible to cover all possible combinations. This series implements equivalent changes made by this kernel patch series [1]. First, this series of patches moves the filename transitions to be part of the avtab and avrule structures. This not only makes the implementation of prefix/suffix matching and future enhancements easier, but also reduces the technical debt regarding the filename transitions. Next, the last three patches implement the support for prefix/suffix name matching itself by extending the structures added in previous patches in this series and adding the support to CIL in the last of the triple. Even though, moving everything to avtab increases the memory usage and the size of the binary policy itself and thus the loading time, the ability to match the prefix or suffix of the name will reduce the overall number of rules in the policy which should mitigate this issue. [1]: https://lore.kernel.org/selinux/20230601170302.nrhuay2wh44g6sh4@jmarcin-t14s-01/ Changelog: v2: - rebased to the latest upstream main - added syntax examples to commit messages (suggested by Jim) - removed the "match_" prefix from keywords and dropped the "match_exact" keyword (suggested by Jim, discussed with Ondrej) - fixed the bug Jim found [2] where the output to conf and CIL did not work - reworked avtab entry skipping when writing older versions of the policy - fixed bug where expand_terule_helper() skipped next entries after filename transition entry - fixed memory leak in filenametr_destroy() found by Christian in the kernel version of the code [3] [2]: https://lore.kernel.org/selinux/CAP+JOzS1nhxF8EttikRtYBW2QtW=ck+P4mC2dovgP4kp-g9WQQ@xxxxxxxxxxxxxx/ [3]: https://lore.kernel.org/selinux/CAJ2a_DecaSa1Z7HiRs4sGUGx3AyKwhFA41EhAo+BViv-qA9ndg@xxxxxxxxxxxxxx/ Juraj Marcin (8): checkpolicy,libsepol: move transition to separate structure in avtab checkpolicy,libsepol: move filename transitions to avtab checkpolicy,libsepol: move filename transition rules to avrule libsepol: implement new kernel binary format for avtab libsepol: implement new module binary format of avrule checkpolicy,libsepol: add prefix/suffix support to kernel policy checkpolicy,libsepol: add prefix/suffix support to module policy libsepol/cil: add support for prefix/suffix filename transtions to CIL checkpolicy/checkmodule.c | 9 + checkpolicy/module_compiler.c | 12 - checkpolicy/module_compiler.h | 1 - checkpolicy/policy_define.c | 211 +----- checkpolicy/policy_define.h | 3 +- checkpolicy/policy_parse.y | 13 +- checkpolicy/policy_scan.l | 4 + checkpolicy/test/dismod.c | 39 +- checkpolicy/test/dispol.c | 106 +-- libsepol/cil/src/cil.c | 6 + libsepol/cil/src/cil_binary.c | 63 +- libsepol/cil/src/cil_build_ast.c | 26 +- libsepol/cil/src/cil_copy_ast.c | 1 + libsepol/cil/src/cil_internal.h | 4 + libsepol/cil/src/cil_policy.c | 17 +- libsepol/cil/src/cil_resolve_ast.c | 10 + libsepol/cil/src/cil_write_ast.c | 2 + libsepol/include/sepol/policydb/avtab.h | 19 +- libsepol/include/sepol/policydb/hashtab.h | 8 + libsepol/include/sepol/policydb/policydb.h | 50 +- libsepol/src/avrule_block.c | 1 - libsepol/src/avtab.c | 338 +++++++++- libsepol/src/conditional.c | 6 +- libsepol/src/expand.c | 153 ++--- libsepol/src/kernel_to_cil.c | 182 ++--- libsepol/src/kernel_to_common.h | 10 + libsepol/src/kernel_to_conf.c | 178 ++--- libsepol/src/link.c | 57 +- libsepol/src/module_to_cil.c | 86 +-- libsepol/src/optimize.c | 8 + libsepol/src/policydb.c | 479 +++----------- libsepol/src/policydb_validate.c | 101 +-- libsepol/src/services.c | 5 +- libsepol/src/write.c | 735 ++++++++++++++++----- 34 files changed, 1553 insertions(+), 1390 deletions(-) -- 2.40.0
