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Move platform-dependent sandboxing code out of main 

To keep the "main" sequence of events on one screen, while emphasizing
that sandboxing happens either side of ircConnect().
master
C. McEnroe 2021-07-13 15:56:43 -04:00
parent ce53e309e6
commit 2f8ec18e65
1 changed files with 80 additions and 52 deletions
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132
chat.c
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@ -136,6 +136,84 @@ static void signalHandler(int signal) {
signals[signal] = 1; signals[signal] = 1;
} }
static void sandboxEarly(bool log);
static void sandboxLate(int irc);
#if defined __OpenBSD__
static char *promisesInitial;
static char promises[64] = "stdio tty";
static void sandboxEarly(bool log) {
char *ptr = &promises[strlen(promises)];
char *end = &promises[sizeof(promises)];
if (log) {
const char *logdir = dataMkdir("log");
int error = unveil(logdir, "wc");
if (error) err(EX_OSERR, "unveil");
ptr = seprintf(ptr, end, " wpath cpath");
}
if (!self.restricted) {
int error = unveil("/", "x");
if (error) err(EX_OSERR, "unveil");
ptr = seprintf(ptr, end, " proc exec");
}
promisesInitial = ptr;
ptr = seprintf(ptr, end, " inet dns");
int error = pledge(promises, NULL);
if (error) err(EX_OSERR, "pledge");
}
static void sandboxLate(int irc) {
(void)irc;
*promisesInitial = '\0';
int error = pledge(promises, NULL);
if (error) err(EX_OSERR, "pledge");
}
#elif defined __FreeBSD__
static void sandboxEarly(bool log) {
(void)log;
}
static void sandboxLate(int irc) {
if (!self.restricted) return;
// Rights are also limited in uiLoad() and logOpen().
cap_rights_t rights;
int error = 0
|| caph_limit_stdin()
|| caph_rights_limit(
STDOUT_FILENO, cap_rights_init(&rights, CAP_WRITE, CAP_IOCTL)
)
|| caph_limit_stderr()
|| caph_rights_limit(
irc, cap_rights_init(&rights, CAP_SEND, CAP_RECV, CAP_EVENT)
);
if (error) err(EX_OSERR, "cap_rights_limit");
// caph_cache_tzdata(3) doesn't load UTC info, which we need for
// certificate verification. gmtime(3) does.
caph_cache_tzdata();
gmtime(&(time_t) { time(NULL) });
error = caph_enter();
if (error) err(EX_OSERR, "caph_enter");
}
#else
static void sandboxEarly(bool log) {
(void)log;
}
static void sandboxLate(int irc) {
(void)irc;
}
#endif
int main(int argc, char *argv[]) { int main(int argc, char *argv[]) {
setlocale(LC_CTYPE, ""); setlocale(LC_CTYPE, "");
@ -289,60 +367,10 @@ int main(int argc, char *argv[]) {
); );
uiFormat(Network, Cold, NULL, "Traveling..."); uiFormat(Network, Cold, NULL, "Traveling...");
uiDraw(); uiDraw();
#ifdef __OpenBSD__
char promises[64] = "stdio tty";
char *ptr = &promises[strlen(promises)], *end = &promises[sizeof(promises)];
if (log) {
const char *logdir = dataMkdir("log");
int error = unveil(logdir, "wc");
if (error) err(EX_OSERR, "unveil");
ptr = seprintf(ptr, end, " wpath cpath");
}
if (!self.restricted) {
int error = unveil("/", "x");
if (error) err(EX_OSERR, "unveil");
ptr = seprintf(ptr, end, " proc exec");
}
char *promisesInitial = ptr;
ptr = seprintf(ptr, end, " inet dns");
int error = pledge(promises, NULL);
if (error) err(EX_OSERR, "pledge");
#endif
sandboxEarly(log);
int irc = ircConnect(bind, host, port); int irc = ircConnect(bind, host, port);
sandboxLate(irc);
#ifdef __OpenBSD__
*promisesInitial = '\0';
error = pledge(promises, NULL);
if (error) err(EX_OSERR, "pledge");
#endif
#ifdef __FreeBSD__
cap_rights_t rights;
int error = 0
|| caph_limit_stdin()
|| caph_rights_limit(
STDOUT_FILENO, cap_rights_init(&rights, CAP_WRITE, CAP_IOCTL)
)
|| caph_limit_stderr()
|| caph_rights_limit(
irc, cap_rights_init(&rights, CAP_SEND, CAP_RECV, CAP_EVENT)
);
if (error) err(EX_OSERR, "cap_rights_limit");
if (self.restricted) {
// caph_cache_tzdata(3) doesn't load UTC info, which we need for
// certificate verification. gmtime(3) does.
caph_cache_tzdata();
gmtime(&(time_t) { time(NULL) });
error = caph_enter();
if (error) err(EX_OSERR, "caph_enter");
}
#endif
ircHandshake(); ircHandshake();
if (pass) { if (pass) {