1 0126d91d 2022-09-07 op /*
  2 eac9287d 2023-06-24 op  * Copyright (c) 2022, 2023 Omar Polo <op@omarpolo.com>
  3 0126d91d 2022-09-07 op  *
  4 0126d91d 2022-09-07 op  * Permission to use, copy, modify, and distribute this software for any
  5 0126d91d 2022-09-07 op  * purpose with or without fee is hereby granted, provided that the above
  6 0126d91d 2022-09-07 op  * copyright notice and this permission notice appear in all copies.
  7 0126d91d 2022-09-07 op  *
  8 0126d91d 2022-09-07 op  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9 0126d91d 2022-09-07 op  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10 0126d91d 2022-09-07 op  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11 0126d91d 2022-09-07 op  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12 0126d91d 2022-09-07 op  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13 0126d91d 2022-09-07 op  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14 0126d91d 2022-09-07 op  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15 0126d91d 2022-09-07 op  */
 16 0126d91d 2022-09-07 op 
 17 0126d91d 2022-09-07 op #include "gmid.h"
 18 0126d91d 2022-09-07 op 
 19 0126d91d 2022-09-07 op #include <sys/stat.h>
 20 0126d91d 2022-09-07 op #include <sys/wait.h>
 21 0126d91d 2022-09-07 op 
 22 0126d91d 2022-09-07 op #include <errno.h>
 23 0126d91d 2022-09-07 op #include <fcntl.h>
 24 0126d91d 2022-09-07 op #include <getopt.h>
 25 0046c1fe 2023-06-06 op #include <locale.h>
 26 0126d91d 2022-09-07 op #include <libgen.h>
 27 0126d91d 2022-09-07 op #include <signal.h>
 28 0126d91d 2022-09-07 op #include <string.h>
 29 eae52ad4 2023-06-06 op #include <syslog.h>
 30 0126d91d 2022-09-07 op #include <unistd.h>
 31 0126d91d 2022-09-07 op 
 32 eae52ad4 2023-06-06 op #include "log.h"
 33 df5058c9 2023-06-05 op 
 34 797c4609 2023-06-08 op int privsep_process;
 35 0126d91d 2022-09-07 op 
 36 0126d91d 2022-09-07 op static const struct option opts[] = {
 37 0126d91d 2022-09-07 op 	{"help",	no_argument,	NULL,	'h'},
 38 0126d91d 2022-09-07 op 	{"version",	no_argument,	NULL,	'V'},
 39 0126d91d 2022-09-07 op 	{NULL,		0,		NULL,	0},
 40 0126d91d 2022-09-07 op };
 41 797c4609 2023-06-08 op 
 42 797c4609 2023-06-08 op void
 43 797c4609 2023-06-08 op log_request(struct client *c, char *meta, size_t l)
 44 797c4609 2023-06-08 op {
 45 ed164e72 2023-06-26 op 	char b[GEMINI_URL_LEN];
 46 797c4609 2023-06-08 op 	const char *t;
 47 797c4609 2023-06-08 op 
 48 797c4609 2023-06-08 op 	if (c->iri.schema != NULL) {
 49 797c4609 2023-06-08 op 		/* serialize the IRI */
 50 797c4609 2023-06-08 op 		strlcpy(b, c->iri.schema, sizeof(b));
 51 797c4609 2023-06-08 op 		strlcat(b, "://", sizeof(b));
 52 797c4609 2023-06-08 op 
 53 797c4609 2023-06-08 op 		/* log the decoded host name, but if it was invalid
 54 797c4609 2023-06-08 op 		 * use the raw one. */
 55 797c4609 2023-06-08 op 		if (*c->domain != '\0')
 56 797c4609 2023-06-08 op 			strlcat(b, c->domain, sizeof(b));
 57 797c4609 2023-06-08 op 		else
 58 797c4609 2023-06-08 op 			strlcat(b, c->iri.host, sizeof(b));
 59 797c4609 2023-06-08 op 
 60 797c4609 2023-06-08 op 		if (*c->iri.path != '/')
 61 797c4609 2023-06-08 op 			strlcat(b, "/", sizeof(b));
 62 797c4609 2023-06-08 op 		strlcat(b, c->iri.path, sizeof(b)); /* TODO: sanitize UTF8 */
 63 797c4609 2023-06-08 op 		if (*c->iri.query != '\0') {	    /* TODO: sanitize UTF8 */
 64 797c4609 2023-06-08 op 			strlcat(b, "?", sizeof(b));
 65 797c4609 2023-06-08 op 			strlcat(b, c->iri.query, sizeof(b));
 66 797c4609 2023-06-08 op 		}
 67 797c4609 2023-06-08 op 	} else {
 68 797c4609 2023-06-08 op 		if ((t = c->req) == NULL)
 69 797c4609 2023-06-08 op 			t = "";
 70 797c4609 2023-06-08 op 		strlcpy(b, t, sizeof(b));
 71 797c4609 2023-06-08 op 	}
 72 0126d91d 2022-09-07 op 
 73 797c4609 2023-06-08 op 	if ((t = memchr(meta, '\r', l)) == NULL)
 74 ab55c781 2023-06-23 op 		t = meta + l;
 75 797c4609 2023-06-08 op 
 76 ed164e72 2023-06-26 op 	fprintf(stderr, "%s:%s GET %s %.*s\n", c->rhost, c->rserv, b,
 77 797c4609 2023-06-08 op 	    (int)(t-meta), meta);
 78 797c4609 2023-06-08 op }
 79 797c4609 2023-06-08 op 
 80 0126d91d 2022-09-07 op void
 81 0126d91d 2022-09-07 op load_local_cert(struct vhost *h, const char *hostname, const char *dir)
 82 0126d91d 2022-09-07 op {
 83 0126d91d 2022-09-07 op 	char *cert, *key;
 84 0126d91d 2022-09-07 op 
 85 0126d91d 2022-09-07 op 	if (asprintf(&cert, "%s/%s.cert.pem", dir, hostname) == -1)
 86 2dd5994a 2023-06-06 op 		fatal("asprintf");
 87 0126d91d 2022-09-07 op 	if (asprintf(&key, "%s/%s.key.pem", dir, hostname) == -1)
 88 2dd5994a 2023-06-06 op 		fatal("asprintf");
 89 0126d91d 2022-09-07 op 
 90 0126d91d 2022-09-07 op 	if (access(cert, R_OK) == -1 || access(key, R_OK) == -1)
 91 0126d91d 2022-09-07 op 		gen_certificate(hostname, cert, key);
 92 0126d91d 2022-09-07 op 
 93 797c4609 2023-06-08 op 	h->cert = tls_load_file(cert, &h->certlen, NULL);
 94 797c4609 2023-06-08 op 	if (h->cert == NULL)
 95 797c4609 2023-06-08 op 		fatal("can't load %s", cert);
 96 797c4609 2023-06-08 op 
 97 797c4609 2023-06-08 op 	h->key = tls_load_file(key, &h->keylen, NULL);
 98 797c4609 2023-06-08 op 	if (h->key == NULL)
 99 797c4609 2023-06-08 op 		fatal("can't load %s", key);
100 797c4609 2023-06-08 op 
101 534afd0d 2022-10-05 op 	strlcpy(h->domain, hostname, sizeof(h->domain));
102 0126d91d 2022-09-07 op }
103 0126d91d 2022-09-07 op 
104 0126d91d 2022-09-07 op /* wrapper around dirname(3).  dn must be PATH_MAX+1 at least. */
105 0126d91d 2022-09-07 op static void
106 0126d91d 2022-09-07 op pdirname(const char *path, char *dn)
107 0126d91d 2022-09-07 op {
108 0126d91d 2022-09-07 op 	char	 p[PATH_MAX+1];
109 0126d91d 2022-09-07 op 	char	*t;
110 0126d91d 2022-09-07 op 
111 0126d91d 2022-09-07 op 	strlcpy(p, path, sizeof(p));
112 0126d91d 2022-09-07 op 	t = dirname(p);
113 0126d91d 2022-09-07 op 	memmove(dn, t, strlen(t)+1);
114 0126d91d 2022-09-07 op }
115 0126d91d 2022-09-07 op 
116 0126d91d 2022-09-07 op static void
117 0126d91d 2022-09-07 op mkdirs(const char *path, mode_t mode)
118 0126d91d 2022-09-07 op {
119 0126d91d 2022-09-07 op 	char	dname[PATH_MAX+1];
120 0126d91d 2022-09-07 op 
121 0126d91d 2022-09-07 op 	pdirname(path, dname);
122 0126d91d 2022-09-07 op 	if (!strcmp(dname, "/"))
123 0126d91d 2022-09-07 op 		return;
124 0126d91d 2022-09-07 op 	mkdirs(dname, mode);
125 0126d91d 2022-09-07 op 	if (mkdir(path, mode) != 0 && errno != EEXIST)
126 df5058c9 2023-06-05 op 		fatal("can't mkdir %s", path);
127 0126d91d 2022-09-07 op }
128 0126d91d 2022-09-07 op 
129 0126d91d 2022-09-07 op /* $XDG_DATA_HOME/gmid */
130 0126d91d 2022-09-07 op char *
131 0126d91d 2022-09-07 op data_dir(void)
132 0126d91d 2022-09-07 op {
133 0126d91d 2022-09-07 op 	const char *home, *xdg;
134 0126d91d 2022-09-07 op 	char *t;
135 0126d91d 2022-09-07 op 
136 0126d91d 2022-09-07 op 	if ((xdg = getenv("XDG_DATA_HOME")) == NULL) {
137 0126d91d 2022-09-07 op 		if ((home = getenv("HOME")) == NULL)
138 2dd5994a 2023-06-06 op 			fatalx("XDG_DATA_HOME and HOME both empty");
139 0126d91d 2022-09-07 op 		if (asprintf(&t, "%s/.local/share/gmid", home) == -1)
140 2dd5994a 2023-06-06 op 			fatalx("asprintf");
141 0126d91d 2022-09-07 op 	} else {
142 0126d91d 2022-09-07 op 		if (asprintf(&t, "%s/gmid", xdg) == -1)
143 2dd5994a 2023-06-06 op 			fatal("asprintf");
144 0126d91d 2022-09-07 op 	}
145 0126d91d 2022-09-07 op 
146 0126d91d 2022-09-07 op 	mkdirs(t, 0755);
147 0126d91d 2022-09-07 op 	return t;
148 0126d91d 2022-09-07 op }
149 0126d91d 2022-09-07 op 
150 0126d91d 2022-09-07 op static int
151 af1dab18 2023-06-09 op serve(struct conf *conf, const char *host, int port, const char *dir)
152 0126d91d 2022-09-07 op {
153 0126d91d 2022-09-07 op 	struct addrinfo hints, *res, *res0;
154 509d0509 2023-06-23 op 	struct vhost *vh = TAILQ_FIRST(&conf->hosts);
155 509d0509 2023-06-23 op 	struct address *addr, *acp;
156 4267093e 2023-06-06 op 	int r, error, saved_errno, sock = -1;
157 0126d91d 2022-09-07 op 	const char *cause = NULL;
158 0126d91d 2022-09-07 op 	char service[32];
159 509d0509 2023-06-23 op 	int any = 0;
160 0126d91d 2022-09-07 op 
161 509d0509 2023-06-23 op 	event_init();
162 509d0509 2023-06-23 op 
163 4267093e 2023-06-06 op 	r = snprintf(service, sizeof(service), "%d", port);
164 4267093e 2023-06-06 op 	if (r < 0 || (size_t)r >= sizeof(service))
165 0126d91d 2022-09-07 op 		fatal("snprintf");
166 0126d91d 2022-09-07 op 
167 0126d91d 2022-09-07 op 	memset(&hints, 0, sizeof(hints));
168 0126d91d 2022-09-07 op 	hints.ai_family = AF_UNSPEC;
169 0126d91d 2022-09-07 op 	hints.ai_socktype = SOCK_STREAM;
170 0126d91d 2022-09-07 op 	hints.ai_flags = AI_PASSIVE;
171 0126d91d 2022-09-07 op 	error = getaddrinfo(host, service, &hints, &res0);
172 0126d91d 2022-09-07 op 	if (error)
173 df5058c9 2023-06-05 op 		fatalx("%s", gai_strerror(error));
174 0126d91d 2022-09-07 op 	for (res = res0; res; res = res->ai_next) {
175 0126d91d 2022-09-07 op 		sock = socket(res->ai_family, res->ai_socktype,
176 0126d91d 2022-09-07 op 		    res->ai_protocol);
177 0126d91d 2022-09-07 op 		if (sock == -1) {
178 0126d91d 2022-09-07 op 			cause = "socket";
179 0126d91d 2022-09-07 op 			continue;
180 0126d91d 2022-09-07 op 		}
181 0126d91d 2022-09-07 op 
182 0126d91d 2022-09-07 op 		if (bind(sock, res->ai_addr, res->ai_addrlen) == -1) {
183 0126d91d 2022-09-07 op 			cause = "bind";
184 0126d91d 2022-09-07 op 			saved_errno = errno;
185 0126d91d 2022-09-07 op 			close(sock);
186 0126d91d 2022-09-07 op 			errno = saved_errno;
187 0126d91d 2022-09-07 op 			continue;
188 0126d91d 2022-09-07 op 		}
189 0126d91d 2022-09-07 op 
190 0126d91d 2022-09-07 op 		if (listen(sock, 5) == -1)
191 0126d91d 2022-09-07 op 			fatal("listen");
192 0126d91d 2022-09-07 op 
193 509d0509 2023-06-23 op 		any = 1;
194 509d0509 2023-06-23 op 
195 509d0509 2023-06-23 op 		addr = xcalloc(1, sizeof(*addr));
196 509d0509 2023-06-23 op 		addr->ai_flags = res->ai_flags;
197 509d0509 2023-06-23 op 		addr->ai_family = res->ai_family;
198 509d0509 2023-06-23 op 		addr->ai_socktype = res->ai_socktype;
199 509d0509 2023-06-23 op 		addr->ai_protocol = res->ai_protocol;
200 509d0509 2023-06-23 op 		addr->slen = res->ai_addrlen;
201 509d0509 2023-06-23 op 		memcpy(&addr->ss, res->ai_addr, res->ai_addrlen);
202 509d0509 2023-06-23 op 
203 509d0509 2023-06-23 op 		addr->conf = conf;
204 509d0509 2023-06-23 op 		addr->sock = sock;
205 509d0509 2023-06-23 op 		event_set(&addr->evsock, addr->sock, EV_READ|EV_PERSIST,
206 509d0509 2023-06-23 op 		    do_accept, addr);
207 509d0509 2023-06-23 op 
208 e50f85ad 2023-06-24 op 		if ((addr->ctx = tls_server()) == NULL)
209 e50f85ad 2023-06-24 op 			fatal("tls_server failure");
210 e50f85ad 2023-06-24 op 
211 509d0509 2023-06-23 op 		TAILQ_INSERT_HEAD(&conf->addrs, addr, addrs);
212 509d0509 2023-06-23 op 
213 509d0509 2023-06-23 op 		acp = xcalloc(1, sizeof(*acp));
214 509d0509 2023-06-23 op 		memcpy(acp, addr, sizeof(*acp));
215 509d0509 2023-06-23 op 		acp->sock = -1;
216 509d0509 2023-06-23 op 		memset(&acp->evsock, 0, sizeof(acp->evsock));
217 509d0509 2023-06-23 op 		TAILQ_INSERT_HEAD(&vh->addrs, addr, addrs);
218 0126d91d 2022-09-07 op 	}
219 0126d91d 2022-09-07 op 
220 509d0509 2023-06-23 op 	if (!any)
221 0126d91d 2022-09-07 op 		fatal("%s", cause);
222 0126d91d 2022-09-07 op 	freeaddrinfo(res0);
223 0126d91d 2022-09-07 op 
224 797c4609 2023-06-08 op 	server_init(NULL, NULL, NULL);
225 af1dab18 2023-06-09 op 	if (server_configure_done(conf) == -1)
226 797c4609 2023-06-08 op 		fatalx("server configuration failed");
227 797c4609 2023-06-08 op 
228 eae52ad4 2023-06-06 op 	log_info("serving %s on port %d", dir, port);
229 797c4609 2023-06-08 op 	event_dispatch();
230 797c4609 2023-06-08 op 	log_info("quitting");
231 797c4609 2023-06-08 op 	return 0;
232 0126d91d 2022-09-07 op }
233 0126d91d 2022-09-07 op 
234 0126d91d 2022-09-07 op static __dead void
235 0126d91d 2022-09-07 op usage(void)
236 0126d91d 2022-09-07 op {
237 0126d91d 2022-09-07 op 	fprintf(stderr,
238 c5b4db93 2022-09-10 op 	    "Version: " GE_STRING "\n"
239 0126d91d 2022-09-07 op 	    "Usage: %s [-hVv] [-d certs-dir] [-H hostname] [-p port] [dir]\n",
240 0126d91d 2022-09-07 op 	    getprogname());
241 0126d91d 2022-09-07 op 	exit(1);
242 0126d91d 2022-09-07 op }
243 0126d91d 2022-09-07 op 
244 0126d91d 2022-09-07 op int
245 0126d91d 2022-09-07 op main(int argc, char **argv)
246 0126d91d 2022-09-07 op {
247 af1dab18 2023-06-09 op 	struct conf *conf;
248 0126d91d 2022-09-07 op 	struct vhost *host;
249 0126d91d 2022-09-07 op 	struct location *loc;
250 0126d91d 2022-09-07 op 	const char *errstr, *certs_dir = NULL, *hostname = "localhost";
251 0126d91d 2022-09-07 op 	char path[PATH_MAX];
252 509d0509 2023-06-23 op 	int ch, port = 1965;
253 0126d91d 2022-09-07 op 
254 0046c1fe 2023-06-06 op 	setlocale(LC_CTYPE, "");
255 0046c1fe 2023-06-06 op 
256 eae52ad4 2023-06-06 op 	log_init(1, LOG_DAEMON);
257 eae52ad4 2023-06-06 op 	log_setverbose(0);
258 af1dab18 2023-06-09 op 	conf = config_new();
259 0126d91d 2022-09-07 op 
260 ba290ef3 2023-06-11 op 	/* ge doesn't do privsep so no privsep crypto engine. */
261 ba290ef3 2023-06-11 op 	conf->use_privsep_crypto = 0;
262 ba290ef3 2023-06-11 op 
263 0126d91d 2022-09-07 op 	while ((ch = getopt_long(argc, argv, "d:H:hp:Vv", opts, NULL)) != -1) {
264 0126d91d 2022-09-07 op 		switch (ch) {
265 0126d91d 2022-09-07 op 		case 'd':
266 0126d91d 2022-09-07 op 			certs_dir = optarg;
267 0126d91d 2022-09-07 op 			break;
268 0126d91d 2022-09-07 op 		case 'H':
269 0126d91d 2022-09-07 op 			hostname = optarg;
270 0126d91d 2022-09-07 op 			break;
271 0126d91d 2022-09-07 op 		case 'h':
272 0126d91d 2022-09-07 op 			usage();
273 0126d91d 2022-09-07 op 			break;
274 0126d91d 2022-09-07 op 		case 'p':
275 509d0509 2023-06-23 op 			port = strtonum(optarg, 0, UINT16_MAX, &errstr);
276 0126d91d 2022-09-07 op 			if (errstr)
277 df5058c9 2023-06-05 op 				fatalx("port number is %s: %s", errstr,
278 df5058c9 2023-06-05 op 				    optarg);
279 0126d91d 2022-09-07 op 			break;
280 0126d91d 2022-09-07 op 		case 'V':
281 c5b4db93 2022-09-10 op 			puts("Version: " GE_STRING);
282 0126d91d 2022-09-07 op 			return 0;
283 0126d91d 2022-09-07 op 		default:
284 0126d91d 2022-09-07 op 			usage();
285 0126d91d 2022-09-07 op 			break;
286 0126d91d 2022-09-07 op 		}
287 0126d91d 2022-09-07 op 	}
288 0126d91d 2022-09-07 op 	argc -= optind;
289 0126d91d 2022-09-07 op 	argv += optind;
290 0126d91d 2022-09-07 op 
291 0126d91d 2022-09-07 op 	if (argc > 1)
292 0126d91d 2022-09-07 op 		usage();
293 0126d91d 2022-09-07 op 
294 0126d91d 2022-09-07 op 	/* prepare the configuration */
295 af1dab18 2023-06-09 op 	init_mime(&conf->mime);
296 0126d91d 2022-09-07 op 
297 0126d91d 2022-09-07 op 	if (certs_dir == NULL)
298 0126d91d 2022-09-07 op 		certs_dir = data_dir();
299 0126d91d 2022-09-07 op 
300 0126d91d 2022-09-07 op 	/* set up the implicit vhost and location */
301 0126d91d 2022-09-07 op 	host = xcalloc(1, sizeof(*host));
302 af1dab18 2023-06-09 op 	TAILQ_INSERT_HEAD(&conf->hosts, host, vhosts);
303 0126d91d 2022-09-07 op 
304 0126d91d 2022-09-07 op 	loc = xcalloc(1, sizeof(*loc));
305 0126d91d 2022-09-07 op 	loc->fcgi = -1;
306 0126d91d 2022-09-07 op 	TAILQ_INSERT_HEAD(&host->locations, loc, locations);
307 0126d91d 2022-09-07 op 
308 0126d91d 2022-09-07 op 	load_local_cert(host, hostname, certs_dir);
309 0126d91d 2022-09-07 op 
310 534afd0d 2022-10-05 op 	strlcpy(host->domain, "*", sizeof(host->domain));
311 0126d91d 2022-09-07 op 	loc->auto_index = 1;
312 534afd0d 2022-10-05 op 	strlcpy(loc->match, "*", sizeof(loc->match));
313 0126d91d 2022-09-07 op 
314 0126d91d 2022-09-07 op 	if (*argv == NULL) {
315 0126d91d 2022-09-07 op 		if (getcwd(path, sizeof(path)) == NULL)
316 0126d91d 2022-09-07 op 			fatal("getcwd");
317 534afd0d 2022-10-05 op 		strlcpy(loc->dir, path, sizeof(loc->dir));
318 534afd0d 2022-10-05 op 	} else {
319 534afd0d 2022-10-05 op 		char	*tmp;
320 0126d91d 2022-09-07 op 
321 534afd0d 2022-10-05 op 		tmp = absolutify_path(*argv);
322 534afd0d 2022-10-05 op 		strlcpy(loc->dir, tmp, sizeof(loc->dir));
323 534afd0d 2022-10-05 op 		free(tmp);
324 534afd0d 2022-10-05 op 	}
325 534afd0d 2022-10-05 op 
326 0126d91d 2022-09-07 op 	/* start the server */
327 0126d91d 2022-09-07 op 	signal(SIGPIPE, SIG_IGN);
328 0126d91d 2022-09-07 op 	setproctitle("%s", loc->dir);
329 509d0509 2023-06-23 op 	return serve(conf, hostname, port, loc->dir);
330 0126d91d 2022-09-07 op }