8ac5aef8f3
This change takes capsicum-test from upstream and applies some local changes to make the
tests work on FreeBSD when executed via Kyua.
The local modifications are as follows:
1. Make `OpenatTest.WithFlag` pass with the new dot-dot lookup behavior in FreeBSD 12.x+.
2. capsicum-test references a set of helper binaries: `mini-me`, `mini-me.noexec`, and
`mini-me.setuid`, as part of the execve/fexecve tests, via execve, fexecve, and open.
It achieves this upstream by assuming `mini-me*` is in the current directory, however,
in order for Kyua to execute `capsicum-test`, it needs to provide a full path to
`mini-me*`. In order to achieve this, I made `capsicum-test` cache the executable's
path from argv[0] in main(..) and use the cached value to compute the path to
`mini-me*` as part of the execve/fexecve testcases.
3. The capsicum-test test suite assumes that it's always being run on CAPABILITIES enabled
kernels. However, there's a chance that the test will be run on a host without a
CAPABILITIES enabled kernel, so we must check for the support before running the tests.
The way to achieve this is to add the relevant `feature_present("security_capabilities")`
check to SetupEnvironment::SetUp() and skip the tests when the support is not available.
While here, add a check for `kern.trap_enotcap` being enabled. As noted by markj@ in
https://github.com/google/capsicum-test/issues/23, this sysctl being enabled can trigger
non-deterministic failures. Therefore, the tests should be skipped if this sysctl is
enabled.
All local changes have been submitted to the capsicum-test project
(https://github.com/google/capsicum-test) and are in various stages of review.
Please see the following pull requests for more details:
1. https://github.com/google/capsicum-test/pull/35
2. https://github.com/google/capsicum-test/pull/41
3. https://github.com/google/capsicum-test/pull/42
Reviewed by: asomers
Discussed with: emaste, markj
Approved by: emaste (mentor)
MFC after: 2 months
Differential Revision: https://reviews.freebsd.org/D19758
63 lines
2.7 KiB
Markdown
63 lines
2.7 KiB
Markdown
# Capsicum User Space Tests
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This directory holds unit tests for [Capsicum](http://www.cl.cam.ac.uk/research/security/capsicum/)
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object-capabilities. The tests exercise the syscall interface to a Capsicum-enabled operating system,
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currently either [FreeBSD >=10.x](http://www.freebsd.org) or a modified Linux kernel (the
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[capsicum-linux](http://github.com/google/capsicum-linux) project).
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The tests are written in C++98, and use the [Google Test](https://code.google.com/p/googletest/)
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framework, with some additions to fork off particular tests (because a process that enters capability
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mode cannot leave it again).
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## Provenance
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The original basis for these tests was:
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- [unit tests](https://github.com/freebsd/freebsd/tree/master/tools/regression/security/cap_test)
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written by Robert Watson and Jonathan Anderson for the original FreeBSD 9.x Capsicum implementation
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- [unit tests](http://git.chromium.org/gitweb/?p=chromiumos/third_party/kernel-capsicum.git;a=tree;f=tools/testing/capsicum_tests;hb=refs/heads/capsicum) written by Meredydd Luff for the original Capsicum-Linux port.
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These tests were coalesced and moved into an independent repository to enable
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comparative testing across multiple OSes, and then substantially extended.
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## OS Configuration
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### Linux
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The following kernel configuration options are needed to run the tests:
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- `CONFIG_SECURITY_CAPSICUM`: enable the Capsicum framework
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- `CONFIG_PROCDESC`: enable Capsicum process-descriptor functionality
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- `CONFIG_DEBUG_FS`: enable debug filesystem
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- `CONFIG_IP_SCTP`: enable SCTP support
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### FreeBSD (>= 10.x)
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The following kernel configuration options are needed so that all tests can run:
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- `options P1003_1B_MQUEUE`: Enable POSIX message queues (or `kldload mqueuefs`)
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## Other Dependencies
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### Linux
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The following additional development packages are needed to build the full test suite on Linux.
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- `libcaprights`: See below
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- `libcap-dev`: Provides headers for POSIX.1e capabilities.
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- `libsctp1`: Provides SCTP library functions.
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- `libsctp-dev`: Provides headers for SCTP library functions.
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## Linux libcaprights
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The Capsicum userspace library is held in the `libcaprights/` subdirectory. Ideally, this
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library should be built (with `./configure; make` or `dpkg-buildpackage -uc -us`) and
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installed (with `make install` or `dpkg -i libcaprights*.deb`) so that the tests will
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use behave like a normal Capsicum-aware application.
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However, if no installed copy of the library is found, the `GNUmakefile` will attempt
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to use the local `libcaprights/*.c` source; this requires `./configure` to have been
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performed in the `libcaprights` subdirectory. The local code is also used for
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cross-compiled builds of the test suite (e.g. `make ARCH=32` or `make ARCH=x32`).
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