Blob
Date:
Fri Apr 8 13:52:35 2022 UTC
Message:
don't load the built-in list when using `types'
/*
* Copyright (c) 2020 Omar Polo <op@omarpolo.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "gmid.h"
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <libgen.h>
#include <limits.h>
#include <pwd.h>
#include <signal.h>
#include <string.h>
static const char *opts = "6c:D:d:fH:hnP:p:Vvx:";
static const struct option longopts[] = {
{"help", no_argument, NULL, 'h'},
{"version", no_argument, NULL, 'V'},
{NULL, 0, NULL, 0},
};
struct fcgi fcgi[FCGI_MAX];
struct vhosthead hosts;
int sock4, sock6;
struct imsgbuf logibuf, exibuf, servibuf[PROC_MAX];
const char *config_path, *certs_dir, *hostname, *pidfile, *cgi;
struct conf conf;
struct tls_config *tlsconf;
struct tls *ctx;
static void
dummy_handler(int signo)
{
return;
}
/* wrapper around dirname(3). dn must be PATH_MAX+1 at least. */
static void
pdirname(const char *path, char *dn)
{
char p[PATH_MAX+1];
char *t;
strlcpy(p, path, sizeof(p));
t = dirname(p);
memmove(dn, t, strlen(t)+1);
}
static void
mkdirs(const char *path, mode_t mode)
{
char dname[PATH_MAX+1];
pdirname(path, dname);
if (!strcmp(dname, "/"))
return;
mkdirs(dname, mode);
if (mkdir(path, mode) != 0 && errno != EEXIST)
fatal("can't mkdir %s: %s", path, strerror(errno));
}
/* $XDG_DATA_HOME/gmid */
char *
data_dir(void)
{
const char *home, *xdg;
char *t;
if ((xdg = getenv("XDG_DATA_HOME")) == NULL) {
if ((home = getenv("HOME")) == NULL)
errx(1, "XDG_DATA_HOME and HOME both empty");
if (asprintf(&t, "%s/.local/share/gmid", home) == -1)
err(1, "asprintf");
} else {
if (asprintf(&t, "%s/gmid", xdg) == -1)
err(1, "asprintf");
}
mkdirs(t, 0755);
return t;
}
void
load_local_cert(const char *hostname, const char *dir)
{
char *cert, *key;
struct vhost *h;
if (asprintf(&cert, "%s/%s.cert.pem", dir, hostname) == -1)
errx(1, "asprintf");
if (asprintf(&key, "%s/%s.key.pem", dir, hostname) == -1)
errx(1, "asprintf");
if (access(cert, R_OK) == -1 || access(key, R_OK) == -1)
gen_certificate(hostname, cert, key);
h = TAILQ_FIRST(&hosts);
h->cert = cert;
h->key = key;
h->domain = hostname;
}
void
load_vhosts(void)
{
struct vhost *h;
struct location *l;
TAILQ_FOREACH(h, &hosts, vhosts) {
TAILQ_FOREACH(l, &h->locations, locations) {
if (l->dir == NULL)
continue;
if ((l->dirfd = open(l->dir, O_RDONLY | O_DIRECTORY)) == -1)
fatal("open %s for domain %s: %s", l->dir, h->domain,
strerror(errno));
}
}
}
int
make_socket(int port, int family)
{
int sock, v;
struct sockaddr_in addr4;
struct sockaddr_in6 addr6;
struct sockaddr *addr;
socklen_t len;
switch (family) {
case AF_INET:
memset(&addr4, 0, sizeof(addr4));
addr4.sin_family = family;
addr4.sin_port = htons(port);
addr4.sin_addr.s_addr = INADDR_ANY;
addr = (struct sockaddr*)&addr4;
len = sizeof(addr4);
break;
case AF_INET6:
memset(&addr6, 0, sizeof(addr6));
addr6.sin6_family = AF_INET6;
addr6.sin6_port = htons(port);
addr6.sin6_addr = in6addr_any;
addr = (struct sockaddr*)&addr6;
len = sizeof(addr6);
break;
default:
/* unreachable */
abort();
}
if ((sock = socket(family, SOCK_STREAM, 0)) == -1)
fatal("socket: %s", strerror(errno));
v = 1;
if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) == -1)
fatal("setsockopt(SO_REUSEADDR): %s", strerror(errno));
v = 1;
if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &v, sizeof(v)) == -1)
fatal("setsockopt(SO_REUSEPORT): %s", strerror(errno));
mark_nonblock(sock);
if (bind(sock, addr, len) == -1)
fatal("bind: %s", strerror(errno));
if (listen(sock, 16) == -1)
fatal("listen: %s", strerror(errno));
return sock;
}
static void
add_keypair(struct vhost *h)
{
if (h->ocsp == NULL) {
if (tls_config_add_keypair_file(tlsconf, h->cert, h->key) == -1)
fatal("failed to load the keypair (%s, %s)",
h->cert, h->key);
} else {
if (tls_config_add_keypair_ocsp_file(tlsconf, h->cert, h->key,
h->ocsp) == -1)
fatal("failed to load the keypair (%s, %s, %s)",
h->cert, h->key, h->ocsp);
}
}
void
setup_tls(void)
{
struct vhost *h;
if ((tlsconf = tls_config_new()) == NULL)
fatal("tls_config_new");
/* optionally accept client certs, but don't try to verify them */
tls_config_verify_client_optional(tlsconf);
tls_config_insecure_noverifycert(tlsconf);
if (tls_config_set_protocols(tlsconf, conf.protos) == -1)
fatal("tls_config_set_protocols");
if ((ctx = tls_server()) == NULL)
fatal("tls_server failure");
h = TAILQ_FIRST(&hosts);
/* we need to set something, then we can add how many key we want */
if (tls_config_set_keypair_file(tlsconf, h->cert, h->key))
fatal("tls_config_set_keypair_file failed for (%s, %s)",
h->cert, h->key);
/* same for OCSP */
if (h->ocsp != NULL &&
tls_config_set_ocsp_staple_file(tlsconf, h->ocsp) == -1)
fatal("tls_config_set_ocsp_staple_file failed for (%s)",
h->ocsp);
while ((h = TAILQ_NEXT(h, vhosts)) != NULL)
add_keypair(h);
if (tls_configure(ctx, tlsconf) == -1)
fatal("tls_configure: %s", tls_error(ctx));
}
static int
listener_main(struct imsgbuf *ibuf)
{
drop_priv();
if (!conf.mime.skip_defaults && load_default_mime(&conf.mime) == -1)
fatal("load_default_mime: %s", strerror(errno));
load_vhosts();
loop(ctx, sock4, sock6, ibuf);
return 0;
}
void
init_config(void)
{
TAILQ_INIT(&hosts);
conf.port = 1965;
conf.ipv6 = 0;
conf.protos = TLS_PROTOCOL_TLSv1_2 | TLS_PROTOCOL_TLSv1_3;
init_mime(&conf.mime);
conf.chroot = NULL;
conf.user = NULL;
conf.prefork = 3;
}
void
free_config(void)
{
struct vhost *h, *th;
struct location *l, *tl;
struct proxy *p, *tp;
struct envlist *e, *te;
struct alist *a, *ta;
int v, i;
v = conf.verbose;
free_mime(&conf.mime);
free(conf.chroot);
free(conf.user);
memset(&conf, 0, sizeof(conf));
conf.verbose = v;
TAILQ_FOREACH_SAFE(h, &hosts, vhosts, th) {
TAILQ_FOREACH_SAFE(l, &h->locations, locations, tl) {
TAILQ_REMOVE(&h->locations, l, locations);
free((char*)l->match);
free((char*)l->lang);
free((char*)l->default_mime);
free((char*)l->index);
free((char*)l->block_fmt);
free((char*)l->dir);
if (l->dirfd != -1)
close(l->dirfd);
free(l);
}
TAILQ_FOREACH_SAFE(e, &h->env, envs, te) {
TAILQ_REMOVE(&h->env, e, envs);
free(e->name);
free(e->value);
free(e);
}
TAILQ_FOREACH_SAFE(e, &h->params, envs, te) {
TAILQ_REMOVE(&h->params, e, envs);
free(e->name);
free(e->value);
free(e);
}
TAILQ_FOREACH_SAFE(a, &h->aliases, aliases, ta) {
TAILQ_REMOVE(&h->aliases, a, aliases);
free(a->alias);
free(a);
}
TAILQ_FOREACH_SAFE(p, &h->proxies, proxies, tp) {
TAILQ_REMOVE(&h->proxies, p, proxies);
free(p->match_proto);
free(p->match_host);
free(p->host);
free(p->sni);
tls_unload_file(p->cert, p->certlen);
tls_unload_file(p->key, p->keylen);
free(p);
}
free((char*)h->domain);
free((char*)h->cert);
free((char*)h->key);
free((char*)h->ocsp);
free((char*)h->cgi);
free((char*)h->entrypoint);
TAILQ_REMOVE(&hosts, h, vhosts);
free(h);
}
for (i = 0; i < FCGI_MAX; ++i) {
if (fcgi[i].path == NULL && fcgi[i].prog == NULL)
break;
free(fcgi[i].path);
free(fcgi[i].port);
free(fcgi[i].prog);
fcgi[i].path = NULL;
fcgi[i].port = NULL;
fcgi[i].prog = NULL;
}
tls_free(ctx);
tls_config_free(tlsconf);
}
static int
wait_signal(void)
{
sigset_t mask;
int signo;
sigemptyset(&mask);
sigaddset(&mask, SIGHUP);
sigaddset(&mask, SIGINT);
sigaddset(&mask, SIGTERM);
sigwait(&mask, &signo);
return signo == SIGHUP;
}
void
drop_priv(void)
{
struct passwd *pw = NULL;
if (conf.chroot != NULL && conf.user == NULL)
fatal("can't chroot without an user to switch to after.");
if (conf.user != NULL) {
if ((pw = getpwnam(conf.user)) == NULL)
fatal("can't find user %s", conf.user);
}
if (conf.chroot != NULL) {
if (chroot(conf.chroot) != 0 || chdir("/") != 0)
fatal("%s: %s", conf.chroot, strerror(errno));
}
if (pw != NULL) {
if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1)
fatal("setresuid(%d): %s", pw->pw_uid,
strerror(errno));
}
if (getuid() == 0)
log_warn(NULL, "not a good idea to run a network daemon as root");
}
static void
usage(void)
{
fprintf(stderr,
"Version: " GMID_STRING "\n"
"Usage: %s [-fnv] [-c config] [-D macro=value] [-P pidfile]\n"
" %s [-6hVv] [-d certs-dir] [-H hostname] [-p port] [-x cgi] [dir]\n",
getprogname(),
getprogname());
}
static void
logger_init(void)
{
int p[2];
if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, p) == -1)
err(1, "socketpair");
switch (fork()) {
case -1:
err(1, "fork");
case 0:
signal(SIGHUP, SIG_IGN);
close(p[0]);
setproctitle("logger");
imsg_init(&logibuf, p[1]);
drop_priv();
_exit(logger_main(p[1], &logibuf));
default:
close(p[1]);
imsg_init(&logibuf, p[0]);
return;
}
}
static int
serve(int argc, char **argv, struct imsgbuf *ibuf)
{
char path[PATH_MAX];
int i, p[2];
struct vhost *h;
struct location *l;
if (config_path == NULL) {
if (hostname == NULL)
hostname = "localhost";
if (certs_dir == NULL)
certs_dir = data_dir();
load_local_cert(hostname, certs_dir);
h = TAILQ_FIRST(&hosts);
h->domain = "*";
l = TAILQ_FIRST(&h->locations);
l->auto_index = 1;
l->match = "*";
switch (argc) {
case 0:
l->dir = getcwd(path, sizeof(path));
break;
case 1:
l->dir = absolutify_path(argv[0]);
break;
default:
usage();
return 1;
}
log_notice(NULL, "serving %s on port %d", l->dir, conf.port);
}
/* setup tls before dropping privileges: we don't want user
* to put private certs inside the chroot. */
setup_tls();
for (i = 0; i < conf.prefork; ++i) {
if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC,
PF_UNSPEC, p) == -1)
fatal("socketpair: %s", strerror(errno));
switch (fork()) {
case -1:
fatal("fork: %s", strerror(errno));
case 0: /* child */
close(p[0]);
imsg_init(&exibuf, p[1]);
setproctitle("server");
_exit(listener_main(&exibuf));
default:
close(p[1]);
imsg_init(&servibuf[i], p[0]);
}
}
setproctitle("executor");
drop_priv();
_exit(executor_main(ibuf));
}
static int
write_pidfile(const char *pidfile)
{
struct flock lock;
int fd;
if (pidfile == NULL)
return -1;
if ((fd = open(pidfile, O_WRONLY|O_CREAT|O_CLOEXEC, 0600)) == -1)
fatal("can't open pidfile %s: %s", pidfile, strerror(errno));
lock.l_start = 0;
lock.l_len = 0;
lock.l_type = F_WRLCK;
lock.l_whence = SEEK_SET;
if (fcntl(fd, F_SETLK, &lock) == -1)
fatal("can't lock %s, gmid is already running?", pidfile);
if (ftruncate(fd, 0) == -1)
fatal("ftruncate: %s: %s", pidfile, strerror(errno));
dprintf(fd, "%d\n", getpid());
return fd;
}
static void
setup_configless(int argc, char **argv, const char *cgi)
{
struct vhost *host;
struct location *loc;
host = xcalloc(1, sizeof(*host));
host->cgi = cgi;
TAILQ_INSERT_HEAD(&hosts, host, vhosts);
loc = xcalloc(1, sizeof(*loc));
loc->fcgi = -1;
TAILQ_INSERT_HEAD(&host->locations, loc, locations);
serve(argc, argv, NULL);
imsg_compose(&logibuf, IMSG_QUIT, 0, 0, -1, NULL, 0);
imsg_flush(&logibuf);
}
static int
parse_portno(const char *p)
{
const char *errstr;
int n;
n = strtonum(p, 0, UINT16_MAX, &errstr);
if (errstr != NULL)
yyerror("port number is %s: %s", errstr, p);
return n;
}
int
main(int argc, char **argv)
{
struct imsgbuf exibuf;
int ch, conftest = 0, configless = 0;
int pidfd, old_ipv6, old_port;
logger_init();
init_config();
while ((ch = getopt_long(argc, argv, opts, longopts, NULL)) != -1) {
switch (ch) {
case '6':
conf.ipv6 = 1;
configless = 1;
break;
case 'c':
config_path = absolutify_path(optarg);
break;
case 'D':
if (cmdline_symset(optarg) == -1)
fatal("could not parse macro definition: %s",
optarg);
break;
case 'd':
certs_dir = optarg;
configless = 1;
break;
case 'f':
conf.foreground = 1;
break;
case 'H':
hostname = optarg;
configless = 1;
break;
case 'h':
usage();
return 0;
case 'n':
conftest++;
break;
case 'P':
pidfile = optarg;
break;
case 'p':
conf.port = parse_portno(optarg);
configless = 1;
break;
case 'V':
puts("Version: " GMID_STRING);
return 0;
case 'v':
conf.verbose++;
break;
case 'x':
/* drop the starting / (if any) */
if (*optarg == '/')
optarg++;
cgi = optarg;
configless = 1;
break;
default:
usage();
return 1;
}
}
argc -= optind;
argv += optind;
if (config_path == NULL) {
configless = 1;
conf.foreground = 1;
conf.prefork = 1;
conf.verbose++;
}
if (config_path != NULL && (argc > 0 || configless))
fatal("can't specify options in config mode.");
if (conftest) {
if (config_path == NULL)
fatal("missing configuration");
parse_conf(config_path);
fprintf(stderr, "config OK\n");
if (conftest > 1)
print_conf();
return 0;
}
if (!conf.foreground && !configless) {
/* log to syslog */
imsg_compose(&logibuf, IMSG_LOG_TYPE, 0, 0, -1, NULL, 0);
imsg_flush(&logibuf);
if (daemon(1, 1) == -1)
fatal("daemon: %s", strerror(errno));
}
if (config_path != NULL)
parse_conf(config_path);
sock4 = make_socket(conf.port, AF_INET);
sock6 = -1;
if (conf.ipv6)
sock6 = make_socket(conf.port, AF_INET6);
signal(SIGPIPE, SIG_IGN);
signal(SIGCHLD, SIG_IGN);
if (configless) {
setup_configless(argc, argv, cgi);
return 0;
}
pidfd = write_pidfile(pidfile);
/*
* Linux seems to call the event handlers even when we're
* doing a sigwait. These dummy handlers are here to avoid
* being terminated on SIGHUP, SIGINT or SIGTERM.
*/
signal(SIGHUP, dummy_handler);
signal(SIGINT, dummy_handler);
signal(SIGTERM, dummy_handler);
/* wait a sighup and reload the daemon */
for (;;) {
int p[2];
if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC,
PF_UNSPEC, p) == -1)
fatal("socketpair: %s", strerror(errno));
switch (fork()) {
case -1:
fatal("fork: %s", strerror(errno));
case 0:
close(p[0]);
imsg_init(&exibuf, p[1]);
_exit(serve(argc, argv, &exibuf));
}
close(p[1]);
imsg_init(&exibuf, p[0]);
if (!wait_signal())
break;
log_info(NULL, "reloading configuration %s", config_path);
/* close the executor (it'll close the servers too) */
imsg_compose(&exibuf, IMSG_QUIT, 0, 0, -1, NULL, 0);
imsg_flush(&exibuf);
close(p[0]);
old_ipv6 = conf.ipv6;
old_port = conf.port;
free_config();
init_config();
parse_conf(config_path);
if (old_port != conf.port) {
close(sock4);
close(sock6);
sock4 = -1;
sock6 = -1;
}
if (sock6 != -1 && old_ipv6 != conf.ipv6) {
close(sock6);
sock6 = -1;
}
if (sock4 == -1)
sock4 = make_socket(conf.port, AF_INET);
if (sock6 == -1 && conf.ipv6)
sock6 = make_socket(conf.port, AF_INET6);
}
imsg_compose(&exibuf, IMSG_QUIT, 0, 0, -1, NULL, 0);
imsg_flush(&exibuf);
imsg_compose(&logibuf, IMSG_QUIT, 0, 0, -1, NULL, 0);
imsg_flush(&logibuf);
if (pidfd != -1)
close(pidfd);
return 0;
}
Omar Polo