mirror of
https://github.com/omar-polo/gmid.git
synced 2024-08-23 04:40:42 +02:00
769 lines
15 KiB
C
769 lines
15 KiB
C
/*
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* Copyright (c) 2020 Omar Polo <op@omarpolo.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "gmid.h"
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <libgen.h>
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#include <limits.h>
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#include <pwd.h>
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#include <signal.h>
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#include <string.h>
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static const char *opts = "6c:D:d:fH:hnP:p:Vvx:";
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static struct option longopts[] = {
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{"help", no_argument, NULL, 'h'},
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{"version", no_argument, NULL, 'V'},
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{NULL, 0, NULL, 0},
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};
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struct fcgi fcgi[FCGI_MAX];
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struct vhosthead hosts;
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int sock4, sock6;
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struct imsgbuf logibuf, exibuf, servibuf[PROC_MAX];
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const char *config_path, *certs_dir, *hostname, *pidfile, *cgi;
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struct conf conf;
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struct tls_config *tlsconf;
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struct tls *ctx;
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static void
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dummy_handler(int signo)
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{
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return;
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}
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/* wrapper around dirname(3). dn must be PATH_MAX+1 at least. */
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static void
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pdirname(const char *path, char *dn)
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{
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char p[PATH_MAX+1];
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char *t;
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strlcpy(p, path, sizeof(p));
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t = dirname(p);
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memmove(dn, t, strlen(t)+1);
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}
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static void
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mkdirs(const char *path, mode_t mode)
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{
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char dname[PATH_MAX+1];
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pdirname(path, dname);
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if (!strcmp(dname, "/"))
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return;
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mkdirs(dname, mode);
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if (mkdir(path, mode) != 0 && errno != EEXIST)
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fatal("can't mkdir %s: %s", path, strerror(errno));
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}
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/* $XDG_DATA_HOME/gmid */
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char *
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data_dir(void)
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{
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const char *home, *xdg;
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char *t;
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if ((xdg = getenv("XDG_DATA_HOME")) == NULL) {
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if ((home = getenv("HOME")) == NULL)
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errx(1, "XDG_DATA_HOME and HOME both empty");
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if (asprintf(&t, "%s/.local/share/gmid", home) == -1)
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err(1, "asprintf");
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} else {
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if (asprintf(&t, "%s/gmid", xdg) == -1)
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err(1, "asprintf");
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}
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mkdirs(t, 0755);
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return t;
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}
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void
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load_local_cert(const char *hostname, const char *dir)
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{
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char *cert, *key;
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struct vhost *h;
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if (asprintf(&cert, "%s/%s.cert.pem", dir, hostname) == -1)
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errx(1, "asprintf");
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if (asprintf(&key, "%s/%s.key.pem", dir, hostname) == -1)
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errx(1, "asprintf");
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if (access(cert, R_OK) == -1 || access(key, R_OK) == -1)
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gen_certificate(hostname, cert, key);
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h = TAILQ_FIRST(&hosts);
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h->cert = cert;
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h->key = key;
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h->domain = hostname;
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}
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void
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load_vhosts(void)
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{
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struct vhost *h;
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struct location *l;
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TAILQ_FOREACH(h, &hosts, vhosts) {
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TAILQ_FOREACH(l, &h->locations, locations) {
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if (l->dir == NULL)
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continue;
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if ((l->dirfd = open(l->dir, O_RDONLY | O_DIRECTORY)) == -1)
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fatal("open %s for domain %s: %s", l->dir, h->domain,
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strerror(errno));
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}
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}
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}
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int
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make_socket(int port, int family)
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{
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int sock, v;
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struct sockaddr_in addr4;
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struct sockaddr_in6 addr6;
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struct sockaddr *addr;
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socklen_t len;
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switch (family) {
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case AF_INET:
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memset(&addr4, 0, sizeof(addr4));
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addr4.sin_family = family;
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addr4.sin_port = htons(port);
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addr4.sin_addr.s_addr = INADDR_ANY;
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addr = (struct sockaddr*)&addr4;
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len = sizeof(addr4);
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break;
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case AF_INET6:
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memset(&addr6, 0, sizeof(addr6));
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addr6.sin6_family = AF_INET6;
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addr6.sin6_port = htons(port);
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addr6.sin6_addr = in6addr_any;
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addr = (struct sockaddr*)&addr6;
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len = sizeof(addr6);
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break;
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default:
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/* unreachable */
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abort();
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}
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if ((sock = socket(family, SOCK_STREAM, 0)) == -1)
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fatal("socket: %s", strerror(errno));
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v = 1;
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if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) == -1)
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fatal("setsockopt(SO_REUSEADDR): %s", strerror(errno));
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v = 1;
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if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &v, sizeof(v)) == -1)
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fatal("setsockopt(SO_REUSEPORT): %s", strerror(errno));
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mark_nonblock(sock);
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if (bind(sock, addr, len) == -1)
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fatal("bind: %s", strerror(errno));
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if (listen(sock, 16) == -1)
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fatal("listen: %s", strerror(errno));
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return sock;
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}
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static void
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add_keypair(struct vhost *h)
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{
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if (h->ocsp == NULL) {
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if (tls_config_add_keypair_file(tlsconf, h->cert, h->key) == -1)
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fatal("failed to load the keypair (%s, %s)",
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h->cert, h->key);
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} else {
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if (tls_config_add_keypair_ocsp_file(tlsconf, h->cert, h->key,
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h->ocsp) == -1)
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fatal("failed to load the keypair (%s, %s, %s)",
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h->cert, h->key, h->ocsp);
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}
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}
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void
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setup_tls(void)
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{
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struct vhost *h;
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if ((tlsconf = tls_config_new()) == NULL)
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fatal("tls_config_new");
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/* optionally accept client certs, but don't try to verify them */
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tls_config_verify_client_optional(tlsconf);
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tls_config_insecure_noverifycert(tlsconf);
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if (tls_config_set_protocols(tlsconf, conf.protos) == -1)
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fatal("tls_config_set_protocols");
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if ((ctx = tls_server()) == NULL)
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fatal("tls_server failure");
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h = TAILQ_FIRST(&hosts);
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/* we need to set something, then we can add how many key we want */
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if (tls_config_set_keypair_file(tlsconf, h->cert, h->key))
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fatal("tls_config_set_keypair_file failed for (%s, %s)",
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h->cert, h->key);
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/* same for OCSP */
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if (h->ocsp != NULL &&
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tls_config_set_ocsp_staple_file(tlsconf, h->ocsp) == -1)
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fatal("tls_config_set_ocsp_staple_file failed for (%s)",
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h->ocsp);
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while ((h = TAILQ_NEXT(h, vhosts)) != NULL)
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add_keypair(h);
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if (tls_configure(ctx, tlsconf) == -1)
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fatal("tls_configure: %s", tls_error(ctx));
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}
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static int
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listener_main(struct imsgbuf *ibuf)
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{
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drop_priv();
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load_default_mime(&conf.mime);
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load_vhosts();
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loop(ctx, sock4, sock6, ibuf);
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return 0;
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}
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void
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init_config(void)
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{
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TAILQ_INIT(&hosts);
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conf.port = 1965;
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conf.ipv6 = 0;
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conf.protos = TLS_PROTOCOL_TLSv1_2 | TLS_PROTOCOL_TLSv1_3;
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init_mime(&conf.mime);
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conf.chroot = NULL;
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conf.user = NULL;
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conf.prefork = 3;
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}
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void
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free_config(void)
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{
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struct vhost *h, *th;
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struct location *l, *tl;
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struct envlist *e, *te;
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struct alist *a, *ta;
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int v, i;
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v = conf.verbose;
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free(conf.chroot);
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free(conf.user);
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memset(&conf, 0, sizeof(conf));
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conf.verbose = v;
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TAILQ_FOREACH_SAFE(h, &hosts, vhosts, th) {
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TAILQ_FOREACH_SAFE(l, &h->locations, locations, tl) {
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TAILQ_REMOVE(&h->locations, l, locations);
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free((char*)l->match);
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free((char*)l->lang);
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free((char*)l->default_mime);
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free((char*)l->index);
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free((char*)l->block_fmt);
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free((char*)l->dir);
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if (l->dirfd != -1)
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close(l->dirfd);
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free(l);
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}
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TAILQ_FOREACH_SAFE(e, &h->env, envs, te) {
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TAILQ_REMOVE(&h->env, e, envs);
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free(e->name);
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free(e->value);
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free(e);
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}
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TAILQ_FOREACH_SAFE(e, &h->params, envs, te) {
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TAILQ_REMOVE(&h->params, e, envs);
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free(e->name);
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free(e->value);
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free(e);
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}
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TAILQ_FOREACH_SAFE(a, &h->aliases, aliases, ta) {
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TAILQ_REMOVE(&h->aliases, a, aliases);
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free(a->alias);
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free(a);
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}
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free((char*)h->domain);
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free((char*)h->cert);
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free((char*)h->key);
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free((char*)h->ocsp);
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free((char*)h->cgi);
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free((char*)h->entrypoint);
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TAILQ_REMOVE(&hosts, h, vhosts);
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free(h);
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}
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for (i = 0; i < FCGI_MAX; ++i) {
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if (fcgi[i].path == NULL && fcgi[i].prog == NULL)
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break;
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free(fcgi[i].path);
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free(fcgi[i].port);
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free(fcgi[i].prog);
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fcgi[i].path = NULL;
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fcgi[i].port = NULL;
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fcgi[i].prog = NULL;
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}
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tls_free(ctx);
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tls_config_free(tlsconf);
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}
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static int
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wait_signal(void)
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{
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sigset_t mask;
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int signo;
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sigemptyset(&mask);
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sigaddset(&mask, SIGHUP);
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sigaddset(&mask, SIGINT);
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sigaddset(&mask, SIGTERM);
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sigwait(&mask, &signo);
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return signo == SIGHUP;
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}
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void
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drop_priv(void)
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{
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struct passwd *pw = NULL;
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if (conf.chroot != NULL && conf.user == NULL)
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fatal("can't chroot without an user to switch to after.");
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if (conf.user != NULL) {
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if ((pw = getpwnam(conf.user)) == NULL)
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fatal("can't find user %s", conf.user);
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}
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if (conf.chroot != NULL) {
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if (chroot(conf.chroot) != 0 || chdir("/") != 0)
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fatal("%s: %s", conf.chroot, strerror(errno));
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}
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if (pw != NULL) {
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if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1)
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fatal("setresuid(%d): %s", pw->pw_uid,
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strerror(errno));
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}
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if (getuid() == 0)
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log_warn(NULL, "not a good idea to run a network daemon as root");
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}
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static void
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usage(void)
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{
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fprintf(stderr,
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"Version: " GMID_STRING "\n"
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"Usage: %s [-fnv] [-c config] [-D macro=value] [-P pidfile]\n"
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" %s [-6hVv] [-d certs-dir] [-H hostname] [-p port] [-x cgi] [dir]\n",
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getprogname(),
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getprogname());
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}
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static void
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logger_init(void)
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{
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int p[2];
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if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, p) == -1)
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err(1, "socketpair");
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switch (fork()) {
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case -1:
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err(1, "fork");
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case 0:
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signal(SIGHUP, SIG_IGN);
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close(p[0]);
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setproctitle("logger");
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imsg_init(&logibuf, p[1]);
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drop_priv();
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_exit(logger_main(p[1], &logibuf));
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default:
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close(p[1]);
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imsg_init(&logibuf, p[0]);
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return;
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}
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}
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static int
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serve(int argc, char **argv, struct imsgbuf *ibuf)
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{
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char path[PATH_MAX];
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int i, p[2];
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struct vhost *h;
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struct location *l;
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if (config_path == NULL) {
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if (hostname == NULL)
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hostname = "localhost";
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if (certs_dir == NULL)
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certs_dir = data_dir();
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load_local_cert(hostname, certs_dir);
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h = TAILQ_FIRST(&hosts);
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h->domain = "*";
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l = TAILQ_FIRST(&h->locations);
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l->auto_index = 1;
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l->match = "*";
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switch (argc) {
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case 0:
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l->dir = getcwd(path, sizeof(path));
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break;
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case 1:
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l->dir = absolutify_path(argv[0]);
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break;
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default:
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usage();
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return 1;
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}
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log_notice(NULL, "serving %s on port %d", l->dir, conf.port);
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}
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/* setup tls before dropping privileges: we don't want user
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* to put private certs inside the chroot. */
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setup_tls();
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for (i = 0; i < conf.prefork; ++i) {
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if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC,
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PF_UNSPEC, p) == -1)
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fatal("socketpair: %s", strerror(errno));
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switch (fork()) {
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case -1:
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fatal("fork: %s", strerror(errno));
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case 0: /* child */
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close(p[0]);
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imsg_init(&exibuf, p[1]);
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setproctitle("server");
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_exit(listener_main(&exibuf));
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default:
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close(p[1]);
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imsg_init(&servibuf[i], p[0]);
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}
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}
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setproctitle("executor");
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drop_priv();
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_exit(executor_main(ibuf));
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}
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|
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static int
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write_pidfile(const char *pidfile)
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{
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struct flock lock;
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int fd;
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|
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if (pidfile == NULL)
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return -1;
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if ((fd = open(pidfile, O_WRONLY|O_CREAT|O_CLOEXEC, 0600)) == -1)
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fatal("can't open pidfile %s: %s", pidfile, strerror(errno));
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lock.l_start = 0;
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lock.l_len = 0;
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lock.l_type = F_WRLCK;
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lock.l_whence = SEEK_SET;
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if (fcntl(fd, F_SETLK, &lock) == -1)
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fatal("can't lock %s, gmid is already running?", pidfile);
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if (ftruncate(fd, 0) == -1)
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fatal("ftruncate: %s: %s", pidfile, strerror(errno));
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dprintf(fd, "%d\n", getpid());
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return fd;
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}
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|
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static void
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setup_configless(int argc, char **argv, const char *cgi)
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{
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struct vhost *host;
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struct location *loc;
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host = xcalloc(1, sizeof(*host));
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host->cgi = cgi;
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TAILQ_INSERT_HEAD(&hosts, host, vhosts);
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loc = xcalloc(1, sizeof(*loc));
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loc->fcgi = -1;
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TAILQ_INSERT_HEAD(&host->locations, loc, locations);
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|
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serve(argc, argv, NULL);
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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;
|
|
}
|