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Add seccomp bpf sandboxing to redbean

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It's now possible to pass the `-S` or `-SS` flags to sandbox redbean
worker proecsses after they've been forked. The first `-S` flag is
intended to be a permissive builtin policy that limits system calls to
only that which the various parts of redbean serving need. The second
`-SS` flag is intended to be more restrictive, preventing things like
the Lua extensions you download off the web from using the HTTP client
or sockets APIs. In upcoming changes you'll be able to implement your
own Berkeley Packet Filter sandbox programs and load them via Lua.
This commit is contained in:
Justine Tunney 2022-04-18 08:54:42 -07:00
parent 7166679620
commit 5a132f9652
79 changed files with 2271 additions and 651 deletions
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19
libc/sock/syslog.c
View file

@ -50,7 +50,12 @@ static int log_mask;
static uint16_t log_id; /* Used for Windows EvtID */
static int64_t log_fd = -1;
static const struct sockaddr_un log_addr = {AF_UNIX, "/dev/log"};
static const char *const kLogPaths[] = {
"/dev/log",
// "/var/run/log", // TODO: Help with XNU and FreeBSD.
};
static struct sockaddr_un log_addr = {AF_UNIX, "/dev/log"};
static int64_t Time(int64_t *tp) {
struct timespec ts;
@ -73,16 +78,20 @@ forceinline int is_lost_conn(int e) {
}
static void __openlog() {
int i;
if (IsWindows()) {
log_fd = RegisterEventSource(NULL, log_ident);
} else {
log_fd = socket(AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, 0);
if (log_fd >= 0) {
int rc = connect(log_fd, (void *)&log_addr, sizeof(log_addr));
if (rc < 0) {
printf("ERR: connect(openlog) failed: %s (errno=%d)\n", strerror(errno),
errno);
for (i = 0; i < ARRAYLEN(kLogPaths); ++i) {
strcpy(log_addr.sun_path, kLogPaths[i]);
if (!connect(log_fd, (void *)&log_addr, sizeof(log_addr))) {
return;
}
}
printf("ERR: connect(openlog) failed: %s (errno=%d)\n", strerror(errno),
errno);
}
}
}