2 ashd - A Sane HTTP Daemon
3 Copyright (C) 2008 Fredrik Tolf <fredrik@dolda2000.com>
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
24 #include <sys/socket.h>
25 #include <netinet/in.h>
26 #include <arpa/inet.h>
43 #include <gnutls/gnutls.h>
44 #include <gnutls/x509.h>
48 gnutls_certificate_credentials_t creds;
52 struct namedcreds **b;
58 gnutls_certificate_credentials_t creds;
59 gnutls_priority_t ciphers;
60 struct namedcreds **ncreds;
66 struct sockaddr_storage name;
67 gnutls_session_t sess;
72 struct savedsess *next, *prev;
73 gnutls_datum_t key, value;
81 static int numconn = 0, numsess = 0;
82 static struct btree *sessidx = NULL;
83 static struct savedsess *sesslistf = NULL, *sesslistl = NULL;
85 static int sesscmp(void *ap, void *bp)
87 struct savedsess *a = ap, *b = bp;
89 if(a->key.size != b->key.size)
90 return(a->key.size - b->key.size);
91 return(memcmp(a->key.data, b->key.data, a->key.size));
94 static gnutls_datum_t sessdbfetch(void *uudata, gnutls_datum_t key)
96 struct savedsess *sess, lkey;
99 memset(&ret, 0, sizeof(ret));
101 if((sess = btreeget(sessidx, &lkey, sesscmp)) == NULL)
103 ret.data = memcpy(gnutls_malloc(ret.size = sess->value.size), sess->value.data, sess->value.size);
107 static void freesess(struct savedsess *sess)
109 bbtreedel(&sessidx, sess, sesscmp);
111 sess->next->prev = sess->prev;
113 sess->prev->next = sess->next;
114 if(sess == sesslistf)
115 sesslistf = sess->next;
116 if(sess == sesslistl)
117 sesslistl = sess->prev;
118 free(sess->key.data);
119 free(sess->value.data);
124 static int sessdbdel(void *uudata, gnutls_datum_t key)
126 struct savedsess *sess, lkey;
129 if((sess = btreeget(sessidx, &lkey, sesscmp)) == NULL)
135 static void cleansess(void)
137 while(numsess > (max(numconn, 1) * 100))
141 static int sessdbstore(void *uudata, gnutls_datum_t key, gnutls_datum_t value)
144 struct savedsess *sess, lkey;
146 if((value.data == NULL) || (value.size == 0)) {
147 sessdbdel(NULL, key);
151 if((sess = btreeget(sessidx, &lkey, sesscmp)) == NULL) {
153 sess->key.data = memcpy(smalloc(sess->key.size = key.size), key.data, key.size);
154 sess->value.data = memcpy(smalloc(sess->value.size = value.size), value.data, value.size);
155 bbtreeput(&sessidx, sess, sesscmp);
157 sess->next = sesslistf;
159 sesslistf->prev = sess;
161 if(sesslistl == NULL)
165 free(sess->value.data);
166 sess->value.data = memcpy(smalloc(sess->value.size = value.size), value.data, value.size);
167 if(sess != sesslistf) {
169 sess->next->prev = sess->prev;
171 sess->prev->next = sess->next;
172 if(sess == sesslistl)
173 sesslistl = sess->prev;
175 sess->next = sesslistf;
177 sesslistf->prev = sess;
188 static int tlsblock(int fd, gnutls_session_t sess, time_t to)
190 if(gnutls_record_get_direction(sess))
191 return(block(fd, EV_WRITE, to));
193 return(block(fd, EV_READ, to));
196 static ssize_t sslread(void *cookie, void *buf, size_t len)
198 struct sslconn *ssl = cookie;
202 while(ssl->in.d == 0) {
203 sizebuf(ssl->in, ssl->in.d + 1024);
204 ret = gnutls_record_recv(ssl->sess, ssl->in.b + ssl->in.d, ssl->in.s - ssl->in.d);
205 if((ret == GNUTLS_E_INTERRUPTED) || (ret == GNUTLS_E_AGAIN)) {
206 if(tlsblock(ssl->fd, ssl->sess, 60) == 0) {
213 } else if(ret == 0) {
219 xf = min(ssl->in.d, len);
220 memcpy(buf, ssl->in.b, xf);
221 memmove(ssl->in.b, ssl->in.b + xf, ssl->in.d -= xf);
225 static ssize_t sslwrite(void *cookie, const void *buf, size_t len)
227 struct sslconn *ssl = cookie;
233 ret = gnutls_record_send(ssl->sess, buf + off, len - off);
234 if((ret == GNUTLS_E_INTERRUPTED) || (ret == GNUTLS_E_AGAIN)) {
235 if(tlsblock(ssl->fd, ssl->sess, 60) == 0) {
255 static int sslclose(void *cookie)
257 struct sslconn *ssl = cookie;
263 static struct bufioops iofuns = {
269 static int initreq(struct conn *conn, struct hthead *req)
271 struct sslconn *ssl = conn->pdata;
272 struct sockaddr_storage sa;
274 gnutls_datum_t sessid;
277 headappheader(req, "X-Ash-Address", formathaddress((struct sockaddr *)&ssl->name, sizeof(sa)));
278 if(ssl->name.ss_family == AF_INET)
279 headappheader(req, "X-Ash-Port", sprintf3("%i", ntohs(((struct sockaddr_in *)&ssl->name)->sin_port)));
280 else if(ssl->name.ss_family == AF_INET6)
281 headappheader(req, "X-Ash-Port", sprintf3("%i", ntohs(((struct sockaddr_in6 *)&ssl->name)->sin6_port)));
283 if(!getsockname(ssl->fd, (struct sockaddr *)&sa, &salen))
284 headappheader(req, "X-Ash-Server-Address", formathaddress((struct sockaddr *)&sa, sizeof(sa)));
285 headappheader(req, "X-Ash-Server-Port", sprintf3("%i", ssl->port->sport));
286 headappheader(req, "X-Ash-Protocol", "https");
287 if(gnutls_session_get_id2(ssl->sess, &sessid) == GNUTLS_E_SUCCESS) {
288 esessid = base64encode((void *)sessid.data, sessid.size);
289 headappheader(req, "X-Ash-TLS-Session", esessid);
295 static int setcreds(gnutls_session_t sess)
303 pd = gnutls_session_get_ptr(sess);
305 namlen = sizeof(nambuf);
306 if(gnutls_server_name_get(sess, nambuf, &namlen, &ntype, i) != 0)
308 if(ntype != GNUTLS_NAME_DNS)
310 for(o = 0; pd->ncreds[o] != NULL; o++) {
311 for(u = 0; pd->ncreds[o]->names[u] != NULL; u++) {
312 if(!strcmp(pd->ncreds[o]->names[u], nambuf)) {
313 gnutls_credentials_set(sess, GNUTLS_CRD_CERTIFICATE, pd->ncreds[o]->creds);
315 gnutls_certificate_server_set_request(sess, GNUTLS_CERT_REQUEST);
321 gnutls_credentials_set(sess, GNUTLS_CRD_CERTIFICATE, pd->creds);
323 gnutls_certificate_server_set_request(sess, GNUTLS_CERT_REQUEST);
327 static void servessl(struct muth *muth, va_list args)
330 vavar(struct sockaddr_storage, name);
331 vavar(struct sslport *, pd);
334 gnutls_session_t sess;
338 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
339 gnutls_init(&sess, GNUTLS_SERVER);
340 gnutls_priority_set(sess, pd->ciphers);
341 gnutls_db_set_retrieve_function(sess, sessdbfetch);
342 gnutls_db_set_store_function(sess, sessdbstore);
343 gnutls_db_set_remove_function(sess, sessdbdel);
344 gnutls_db_set_ptr(sess, NULL);
345 gnutls_session_set_ptr(sess, pd);
346 gnutls_handshake_set_post_client_hello_function(sess, setcreds);
347 gnutls_transport_set_ptr(sess, (gnutls_transport_ptr_t)(intptr_t)fd);
348 while((ret = gnutls_handshake(sess)) != 0) {
349 if((ret != GNUTLS_E_INTERRUPTED) && (ret != GNUTLS_E_AGAIN))
351 if(tlsblock(fd, sess, 60) <= 0)
354 memset(&conn, 0, sizeof(conn));
355 memset(&ssl, 0, sizeof(ssl));
357 conn.initreq = initreq;
363 serve(bioopen(&ssl, &iofuns), fd, &conn);
371 static void listenloop(struct muth *muth, va_list args)
373 vavar(struct sslport *, pd);
375 struct sockaddr_storage name;
378 fcntl(pd->fd, F_SETFL, fcntl(pd->fd, F_GETFL) | O_NONBLOCK);
380 namelen = sizeof(name);
381 if(block(pd->fd, EV_READ, 0) == 0)
385 ns = accept(pd->fd, (struct sockaddr *)&name, &namelen);
389 if(errno == ECONNABORTED)
391 flog(LOG_ERR, "accept: %s", strerror(errno));
394 mustart(servessl, ns, name, pd);
403 for(i = 0; i < listeners.d; i++) {
404 if(listeners.b[i] == muth)
405 bufdel(listeners, i);
409 static gnutls_dh_params_t dhparams(void)
411 static int inited = 0;
412 static gnutls_dh_params_t pars;
416 if(((ret = gnutls_dh_params_init(&pars)) != 0) ||
417 ((ret = gnutls_dh_params_generate2(pars, 2048)) != 0)) {
418 flog(LOG_ERR, "GnuTLS could not generate Diffie-Hellman parameters: %s", gnutls_strerror(ret));
426 static void init(void)
428 static int inited = 0;
434 if((ret = gnutls_global_init()) != 0) {
435 flog(LOG_ERR, "could not initialize GnuTLS: %s", gnutls_strerror(ret));
440 /* This implementation seems somewhat ugly, but it's the way the
441 * GnuTLS implements the same thing internally, so it should probably
442 * be interoperable, at least. */
443 static int readcrtchain(struct certbuffer *ret, struct charbuf *pem)
445 static char *headers[] = {"-----BEGIN CERTIFICATE", "-----BEGIN X509 CERTIFICATE"};
448 gnutls_x509_crt_t crt;
450 for(i = 0, p = NULL; i < sizeof(headers) / sizeof(*headers); i++) {
451 f = memmem(pem->b, pem->d, headers[i], strlen(headers[i]));
452 if((f != NULL) && ((p == NULL) || (f < p)))
456 return(-GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE);
458 if((rv = gnutls_x509_crt_init(&crt)) < 0)
460 if((rv = gnutls_x509_crt_import(crt, &(gnutls_datum_t){.data = (unsigned char *)p, .size = pem->d - (p - pem->b)}, GNUTLS_X509_FMT_PEM)) < 0) {
461 gnutls_x509_crt_deinit(crt);
465 for(i = 0, p2 = NULL; i < sizeof(headers) / sizeof(*headers); i++) {
466 f = memmem(p + 1, pem->d - (p + 1 - pem->b), headers[i], strlen(headers[i]));
467 if((f != NULL) && ((p2 == NULL) || (f < p2)))
470 } while((p = p2) != NULL);
473 for(i = 0; i < ret->d; i++)
474 gnutls_x509_crt_deinit(ret->b[i]);
479 static struct namedcreds *readncreds(char *file, gnutls_x509_privkey_t defkey)
482 struct namedcreds *nc;
483 struct certbuffer crts;
484 gnutls_x509_privkey_t key;
487 struct charbuf keybuf;
488 struct charvbuf names;
494 if((fd = open(file, O_RDONLY)) < 0) {
495 flog(LOG_ERR, "ssl: %s: %s", file, strerror(errno));
499 sizebuf(keybuf, keybuf.d + 1024);
500 ret = read(fd, keybuf.b + keybuf.d, keybuf.s - keybuf.d);
502 flog(LOG_ERR, "ssl: reading from %s: %s", file, strerror(errno));
504 } else if(ret == 0) {
510 if((ret = readcrtchain(&crts, &keybuf)) != 0) {
511 flog(LOG_ERR, "ssl: could not load certificate chain from %s: %s", file, gnutls_strerror(ret));
514 cnl = sizeof(cn) - 1;
515 if((ret = gnutls_x509_crt_get_dn_by_oid(crts.b[0], GNUTLS_OID_X520_COMMON_NAME, 0, 0, cn, &cnl)) != 0) {
516 flog(LOG_ERR, "ssl: could not read common name from %s: %s", file, gnutls_strerror(ret));
520 bufadd(names, sstrdup(cn));
522 cnl = sizeof(cn) - 1;
523 if(gnutls_x509_crt_get_subject_alt_name2(crts.b[0], i, cn, &cnl, &type, NULL) < 0)
526 if(type == GNUTLS_SAN_DNSNAME)
527 bufadd(names, sstrdup(cn));
529 gnutls_x509_privkey_init(&key);
530 if((ret = gnutls_x509_privkey_import(key, &(gnutls_datum_t){.data = (unsigned char *)keybuf.b, .size = keybuf.d}, GNUTLS_X509_FMT_PEM)) != 0) {
531 if(ret == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
532 gnutls_x509_privkey_deinit(key);
535 flog(LOG_ERR, "ssl: could not load key from %s: %s", file, gnutls_strerror(ret));
543 gnutls_certificate_allocate_credentials(&nc->creds);
544 if((ret = gnutls_certificate_set_x509_key(nc->creds, crts.b, crts.d, key)) != 0) {
545 flog(LOG_ERR, "ssl: could not use certificate from %s: %s", file, gnutls_strerror(ret));
548 gnutls_certificate_set_dh_params(nc->creds, dhparams());
552 static void readncdir(struct ncredbuf *buf, char *dir, gnutls_x509_privkey_t defkey)
558 if((d = opendir(dir)) == NULL) {
559 flog(LOG_ERR, "ssl: could not read certificate directory %s: %s", dir, strerror(errno));
562 while((e = readdir(d)) != NULL) {
563 if(e->d_name[0] == '.')
565 if((es = strlen(e->d_name)) <= 4)
567 if(strcmp(e->d_name + es - 4, ".crt"))
569 bufadd(*buf, readncreds(sprintf3("%s/%s", dir, e->d_name), defkey));
574 void handlegnussl(int argc, char **argp, char **argv)
576 int i, ret, port, fd, clreq;
577 gnutls_certificate_credentials_t creds;
578 gnutls_priority_t ciphers;
579 gnutls_x509_privkey_t defkey;
580 struct ncredbuf ncreds;
581 struct charvbuf ncertf, ncertd;
583 char *crtfile, *keyfile, *perr;
591 gnutls_certificate_allocate_credentials(&creds);
592 keyfile = crtfile = NULL;
594 for(i = 0; i < argc; i++) {
595 if(!strcmp(argp[i], "help")) {
596 printf("ssl handler parameters:\n");
597 printf("\tcert=CERT-FILE [mandatory]\n");
598 printf("\t\tThe name of the file to read the certificate from.\n");
599 printf("\tkey=KEY-FILE [same as CERT-FILE]\n");
600 printf("\t\tThe name of the file to read the private key from.\n");
601 printf("\tprio=PRIORITIES [NORMAL]\n");
602 printf("\t\tCiphersuite priorities, as a GnuTLS priority string.\n");
603 printf("\ttrust=CA-FILE [no default]\n");
604 printf("\t\tThe name of a file to read trusted certificates from.\n");
605 printf("\t\tMay be given multiple times.\n");
606 printf("\tcrl=CRL-FILE [no default]\n");
607 printf("\t\tThe name of a file to read revocation lists from.\n");
608 printf("\t\tMay be given multiple times.\n");
609 printf("\tncert=CERT-FILE [no default]\n");
610 printf("\t\tThe name of a file to read a named certificate from,\n");
611 printf("\t\tfor use with SNI-enabled clients.\n");
612 printf("\t\tMay be given multiple times.\n");
613 printf("\tncertdir=DIR [no default]\n");
614 printf("\t\tRead all *.crt files in the given directory as if they\n");
615 printf("\t\twere given with `ncert' options.\n");
616 printf("\t\tMay be given multiple times.\n");
617 printf("\tport=PORT [443]\n");
618 printf("\t\tThe TCP port to listen on.\n");
620 printf("\tAll X.509 data files must be PEM-encoded.\n");
621 printf("\tIf any certificates were given with `ncert' options, they will be\n");
622 printf("\tused if a client explicitly names one of them with a\n");
623 printf("\tserver-name indication. If a client indicates no server name,\n");
624 printf("\tor if a server-name indication does not match any given\n");
625 printf("\tcertificate, the certificate given with the `cert' option will\n");
626 printf("\tbe used instead.\n");
628 } else if(!strcmp(argp[i], "cert")) {
630 } else if(!strcmp(argp[i], "key")) {
632 } else if(!strcmp(argp[i], "prio")) {
634 gnutls_priority_deinit(ciphers);
635 ret = gnutls_priority_init(&ciphers, argv[i], (const char **)&perr);
636 if(ret == GNUTLS_E_INVALID_REQUEST) {
637 flog(LOG_ERR, "ssl: invalid cipher priority string, at `%s'", perr);
639 } else if(ret != 0) {
640 flog(LOG_ERR, "ssl: could not initialize cipher priorities: %s", gnutls_strerror(ret));
643 } else if(!strcmp(argp[i], "trust")) {
644 if((ret = gnutls_certificate_set_x509_trust_file(creds, argv[i], GNUTLS_X509_FMT_PEM)) != 0) {
645 flog(LOG_ERR, "ssl: could not load trust file `%s': %s", argv[i], gnutls_strerror(ret));
648 for(i = 0; i < ncreds.d; i++) {
649 if((ret = gnutls_certificate_set_x509_trust_file(ncreds.b[i]->creds, argv[i], GNUTLS_X509_FMT_PEM)) != 0) {
650 flog(LOG_ERR, "ssl: could not load trust file `%s': %s", argv[i], gnutls_strerror(ret));
655 } else if(!strcmp(argp[i], "crl")) {
656 if((ret = gnutls_certificate_set_x509_crl_file(creds, argv[i], GNUTLS_X509_FMT_PEM)) != 0) {
657 flog(LOG_ERR, "ssl: could not load CRL file `%s': %s", argv[i], gnutls_strerror(ret));
660 for(i = 0; i < ncreds.d; i++) {
661 if((ret = gnutls_certificate_set_x509_crl_file(ncreds.b[i]->creds, argv[i], GNUTLS_X509_FMT_PEM)) != 0) {
662 flog(LOG_ERR, "ssl: could not load CRL file `%s': %s", argv[i], gnutls_strerror(ret));
667 } else if(!strcmp(argp[i], "port")) {
668 port = atoi(argv[i]);
669 } else if(!strcmp(argp[i], "ncert")) {
670 bufadd(ncertf, argv[i]);
671 } else if(!strcmp(argp[i], "ncertdir")) {
672 bufadd(ncertd, argv[i]);
674 flog(LOG_ERR, "unknown parameter `%s' to ssl handler", argp[i]);
678 if(crtfile == NULL) {
679 flog(LOG_ERR, "ssl: needs certificate file at the very least");
682 if((fd = listensock6(port)) < 0) {
683 flog(LOG_ERR, "could not listen on IPv6 port (port %i): %s", port, strerror(errno));
688 if((ret = gnutls_certificate_set_x509_key_file(creds, crtfile, keyfile, GNUTLS_X509_FMT_PEM)) != 0) {
689 flog(LOG_ERR, "ssl: could not load certificate or key: %s", gnutls_strerror(ret));
692 if((ciphers == NULL) && ((ret = gnutls_priority_init(&ciphers, "NORMAL", NULL)) != 0)) {
693 flog(LOG_ERR, "ssl: could not initialize cipher priorities: %s", gnutls_strerror(ret));
696 if((ret = gnutls_certificate_get_x509_key(creds, 0, &defkey)) != 0) {
697 flog(LOG_ERR, "ssl: could not get default key: %s", gnutls_strerror(ret));
700 for(i = 0; i < ncertf.d; i++)
701 bufadd(ncreds, readncreds(ncertf.b[i], defkey));
702 for(i = 0; i < ncertd.d; i++)
703 readncdir(&ncreds, ncertd.b[i], defkey);
706 gnutls_certificate_set_dh_params(creds, dhparams());
707 bufadd(ncreds, NULL);
713 pd->ncreds = ncreds.b;
714 pd->ciphers = ciphers;
715 bufadd(listeners, mustart(listenloop, pd));
716 if((fd = listensock4(port)) < 0) {
717 if(errno != EADDRINUSE) {
718 flog(LOG_ERR, "could not listen on IPv4 port (port %i): %s", port, strerror(errno));
726 pd->ncreds = ncreds.b;
727 pd->ciphers = ciphers;
728 bufadd(listeners, mustart(listenloop, pd));