freebsd-dev/contrib/capsicum-test/mini-me.c
Enji Cooper 8ac5aef8f3 Integrate capsicum-test into the FreeBSD test suite
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
2019-04-01 21:24:50 +00:00

39 lines
1.0 KiB
C

#include <sys/types.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
int main(int argc, char* argv[]) {
if (argc == 2 && !strcmp(argv[1], "--pass")) {
fprintf(stderr,"[%d] %s immediately returning 0\n", getpid(), argv[0]);
return 0;
}
if (argc == 2 && !strcmp(argv[1], "--fail")) {
fprintf(stderr,"[%d] %s immediately returning 1\n", getpid(), argv[0]);
return 1;
}
if (argc == 2 && !strcmp(argv[1], "--checkroot")) {
int rc = (geteuid() == 0);
fprintf(stderr,"[uid:%d] %s immediately returning (geteuid() == 0) = %d\n", geteuid(), argv[0], rc);
return rc;
}
if (argc == 2 && !strcmp(argv[1], "--capmode")) {
/* Expect to already be in capability mode: check we can't open a file */
int rc = 0;
int fd = open("/etc/passwd", O_RDONLY);
if (fd > 0) {
fprintf(stderr,"[%d] %s unexpectedly able to open file\n", getpid(), argv[0]);
rc = 1;
}
fprintf(stderr,"[%d] %s --capmode returning %d\n", getpid(), argv[0], rc);
return rc;
}
return -1;
}