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;
59 gnutls_certificate_credentials_t creds;
60 gnutls_priority_t ciphers;
61 struct namedcreds **ncreds;
67 struct sockaddr_storage name;
68 gnutls_session_t sess;
73 struct savedsess *next, *prev;
74 gnutls_datum_t key, value;
82 static int numconn = 0, numsess = 0;
83 static struct btree *sessidx = NULL;
84 static struct savedsess *sesslistf = NULL, *sesslistl = NULL;
86 static int sesscmp(void *ap, void *bp)
88 struct savedsess *a = ap, *b = bp;
90 if(a->key.size != b->key.size)
91 return(a->key.size - b->key.size);
92 return(memcmp(a->key.data, b->key.data, a->key.size));
95 static gnutls_datum_t sessdbfetch(void *uudata, gnutls_datum_t key)
97 struct savedsess *sess, lkey;
100 memset(&ret, 0, sizeof(ret));
102 if((sess = btreeget(sessidx, &lkey, sesscmp)) == NULL)
104 ret.data = memcpy(gnutls_malloc(ret.size = sess->value.size), sess->value.data, sess->value.size);
108 static void freesess(struct savedsess *sess)
110 bbtreedel(&sessidx, sess, sesscmp);
112 sess->next->prev = sess->prev;
114 sess->prev->next = sess->next;
115 if(sess == sesslistf)
116 sesslistf = sess->next;
117 if(sess == sesslistl)
118 sesslistl = sess->prev;
119 free(sess->key.data);
120 free(sess->value.data);
125 static int sessdbdel(void *uudata, gnutls_datum_t key)
127 struct savedsess *sess, lkey;
130 if((sess = btreeget(sessidx, &lkey, sesscmp)) == NULL)
136 static void cleansess(void)
138 while(numsess > (max(numconn, 1) * 100))
142 static int sessdbstore(void *uudata, gnutls_datum_t key, gnutls_datum_t value)
145 struct savedsess *sess, lkey;
147 if((value.data == NULL) || (value.size == 0)) {
148 sessdbdel(NULL, key);
152 if((sess = btreeget(sessidx, &lkey, sesscmp)) == NULL) {
154 sess->key.data = memcpy(smalloc(sess->key.size = key.size), key.data, key.size);
155 sess->value.data = memcpy(smalloc(sess->value.size = value.size), value.data, value.size);
156 bbtreeput(&sessidx, sess, sesscmp);
158 sess->next = sesslistf;
160 sesslistf->prev = sess;
162 if(sesslistl == NULL)
166 free(sess->value.data);
167 sess->value.data = memcpy(smalloc(sess->value.size = value.size), value.data, value.size);
168 if(sess != sesslistf) {
170 sess->next->prev = sess->prev;
172 sess->prev->next = sess->next;
173 if(sess == sesslistl)
174 sesslistl = sess->prev;
176 sess->next = sesslistf;
178 sesslistf->prev = sess;
189 static int tlsblock(int fd, gnutls_session_t sess, time_t to)
191 if(gnutls_record_get_direction(sess))
192 return(block(fd, EV_WRITE, to));
194 return(block(fd, EV_READ, to));
197 static ssize_t sslread(void *cookie, void *buf, size_t len)
199 struct sslconn *ssl = cookie;
203 while(ssl->in.d == 0) {
204 sizebuf(ssl->in, ssl->in.d + 1024);
205 ret = gnutls_record_recv(ssl->sess, ssl->in.b + ssl->in.d, ssl->in.s - ssl->in.d);
206 if((ret == GNUTLS_E_INTERRUPTED) || (ret == GNUTLS_E_AGAIN)) {
207 if(tlsblock(ssl->fd, ssl->sess, 60) == 0) {
214 } else if(ret == 0) {
220 xf = min(ssl->in.d, len);
221 memcpy(buf, ssl->in.b, xf);
222 memmove(ssl->in.b, ssl->in.b + xf, ssl->in.d -= xf);
226 static ssize_t sslwrite(void *cookie, const void *buf, size_t len)
228 struct sslconn *ssl = cookie;
234 ret = gnutls_record_send(ssl->sess, buf + off, len - off);
235 if((ret == GNUTLS_E_INTERRUPTED) || (ret == GNUTLS_E_AGAIN)) {
236 if(tlsblock(ssl->fd, ssl->sess, 60) == 0) {
256 static int sslclose(void *cookie)
258 struct sslconn *ssl = cookie;
264 static struct bufioops iofuns = {
270 static int initreq(struct conn *conn, struct hthead *req)
272 struct sslconn *ssl = conn->pdata;
273 struct sockaddr_storage sa;
276 headappheader(req, "X-Ash-Address", formathaddress((struct sockaddr *)&ssl->name, sizeof(sa)));
277 if(ssl->name.ss_family == AF_INET)
278 headappheader(req, "X-Ash-Port", sprintf3("%i", ntohs(((struct sockaddr_in *)&ssl->name)->sin_port)));
279 else if(ssl->name.ss_family == AF_INET6)
280 headappheader(req, "X-Ash-Port", sprintf3("%i", ntohs(((struct sockaddr_in6 *)&ssl->name)->sin6_port)));
282 if(!getsockname(ssl->fd, (struct sockaddr *)&sa, &salen))
283 headappheader(req, "X-Ash-Server-Address", formathaddress((struct sockaddr *)&sa, sizeof(sa)));
284 headappheader(req, "X-Ash-Server-Port", sprintf3("%i", ssl->port->sport));
285 headappheader(req, "X-Ash-Protocol", "https");
289 static void servessl(struct muth *muth, va_list args)
292 vavar(struct sockaddr_storage, name);
293 vavar(struct sslport *, pd);
296 gnutls_session_t sess;
299 int setcreds(gnutls_session_t sess)
307 namlen = sizeof(nambuf);
308 if(gnutls_server_name_get(sess, nambuf, &namlen, &ntype, i) != 0)
310 if(ntype != GNUTLS_NAME_DNS)
312 for(o = 0; pd->ncreds[o] != NULL; o++) {
313 for(u = 0; pd->ncreds[o]->names[u] != NULL; u++) {
314 if(!strcmp(pd->ncreds[o]->names[u], nambuf)) {
315 gnutls_credentials_set(sess, GNUTLS_CRD_CERTIFICATE, pd->ncreds[o]->creds);
316 gnutls_certificate_server_set_request(sess, GNUTLS_CERT_REQUEST);
322 gnutls_credentials_set(sess, GNUTLS_CRD_CERTIFICATE, pd->creds);
323 gnutls_certificate_server_set_request(sess, GNUTLS_CERT_REQUEST);
328 fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
329 gnutls_init(&sess, GNUTLS_SERVER);
330 gnutls_priority_set(sess, pd->ciphers);
331 gnutls_db_set_retrieve_function(sess, sessdbfetch);
332 gnutls_db_set_store_function(sess, sessdbstore);
333 gnutls_db_set_remove_function(sess, sessdbdel);
334 gnutls_db_set_ptr(sess, NULL);
335 gnutls_handshake_set_post_client_hello_function(sess, setcreds);
336 gnutls_transport_set_ptr(sess, (gnutls_transport_ptr_t)(intptr_t)fd);
337 while((ret = gnutls_handshake(sess)) != 0) {
338 if((ret != GNUTLS_E_INTERRUPTED) && (ret != GNUTLS_E_AGAIN))
340 if(tlsblock(fd, sess, 60) <= 0)
343 memset(&conn, 0, sizeof(conn));
344 memset(&ssl, 0, sizeof(ssl));
346 conn.initreq = initreq;
352 serve(bioopen(&ssl, &iofuns), fd, &conn);
360 static void listenloop(struct muth *muth, va_list args)
362 vavar(struct sslport *, pd);
364 struct sockaddr_storage name;
367 fcntl(pd->fd, F_SETFL, fcntl(pd->fd, F_GETFL) | O_NONBLOCK);
369 namelen = sizeof(name);
370 if(block(pd->fd, EV_READ, 0) == 0)
374 ns = accept(pd->fd, (struct sockaddr *)&name, &namelen);
378 if(errno == ECONNABORTED)
380 flog(LOG_ERR, "accept: %s", strerror(errno));
383 mustart(servessl, ns, name, pd);
392 for(i = 0; i < listeners.d; i++) {
393 if(listeners.b[i] == muth)
394 bufdel(listeners, i);
398 static gnutls_dh_params_t dhparams(void)
400 static int inited = 0;
401 static gnutls_dh_params_t pars;
405 if(((ret = gnutls_dh_params_init(&pars)) != 0) ||
406 ((ret = gnutls_dh_params_generate2(pars, 2048)) != 0)) {
407 flog(LOG_ERR, "GnuTLS could not generate Diffie-Hellman parameters: %s", gnutls_strerror(ret));
415 static void init(void)
417 static int inited = 0;
423 if((ret = gnutls_global_init()) != 0) {
424 flog(LOG_ERR, "could not initialize GnuTLS: %s", gnutls_strerror(ret));
429 /* This implementation seems somewhat ugly, but it's the way the
430 * GnuTLS implements the same thing internally, so it should probably
431 * be interoperable, at least. */
432 static int readcrtchain(struct certbuffer *ret, struct charbuf *pem)
434 static char *headers[] = {"-----BEGIN CERTIFICATE", "-----BEGIN X509 CERTIFICATE"};
437 gnutls_x509_crt_t crt;
439 for(i = 0, p = NULL; i < sizeof(headers) / sizeof(*headers); i++) {
440 f = memmem(pem->b, pem->d, headers[i], strlen(headers[i]));
441 if((p == NULL) || (f < p))
445 return(-GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE);
447 if((rv = gnutls_x509_crt_init(&crt)) < 0)
449 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) {
450 gnutls_x509_crt_deinit(crt);
454 for(i = 0, p2 = NULL; i < sizeof(headers) / sizeof(*headers); i++) {
455 f = memmem(p + 1, pem->d - (p + 1 - pem->b), headers[i], strlen(headers[i]));
456 if((p2 == NULL) || (f < p2))
459 } while((p = p2) != NULL);
462 for(i = 0; i < ret->d; i++)
463 gnutls_x509_crt_deinit(ret->b[i]);
468 static struct namedcreds *readncreds(char *file, gnutls_x509_privkey_t defkey)
471 struct namedcreds *nc;
472 struct certbuffer crts;
473 gnutls_x509_privkey_t key;
476 struct charbuf keybuf;
477 struct charvbuf names;
483 if((fd = open(file, O_RDONLY)) < 0) {
484 flog(LOG_ERR, "ssl: %s: %s", file, strerror(errno));
488 sizebuf(keybuf, keybuf.d + 1024);
489 ret = read(fd, keybuf.b + keybuf.d, keybuf.s - keybuf.d);
491 flog(LOG_ERR, "ssl: reading from %s: %s", file, strerror(errno));
493 } else if(ret == 0) {
499 if((ret = readcrtchain(&crts, &keybuf)) != 0) {
500 flog(LOG_ERR, "ssl: could not load certificate chain from %s: %s", file, gnutls_strerror(ret));
503 cnl = sizeof(cn) - 1;
504 if((ret = gnutls_x509_crt_get_dn_by_oid(crts.b[0], GNUTLS_OID_X520_COMMON_NAME, 0, 0, cn, &cnl)) != 0) {
505 flog(LOG_ERR, "ssl: could not read common name from %s: %s", file, gnutls_strerror(ret));
509 bufadd(names, sstrdup(cn));
511 cnl = sizeof(cn) - 1;
512 if(gnutls_x509_crt_get_subject_alt_name2(crts.b[0], i, cn, &cnl, &type, NULL) < 0)
515 if(type == GNUTLS_SAN_DNSNAME)
516 bufadd(names, sstrdup(cn));
518 gnutls_x509_privkey_init(&key);
519 if((ret = gnutls_x509_privkey_import(key, &(gnutls_datum_t){.data = (unsigned char *)keybuf.b, .size = keybuf.d}, GNUTLS_X509_FMT_PEM)) != 0) {
520 if(ret == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
521 gnutls_x509_privkey_deinit(key);
524 flog(LOG_ERR, "ssl: could not load key from %s: %s", file, gnutls_strerror(ret));
532 gnutls_certificate_allocate_credentials(&nc->creds);
533 if((ret = gnutls_certificate_set_x509_key(nc->creds, crts.b, crts.d, key)) != 0) {
534 flog(LOG_ERR, "ssl: could not use certificate from %s: %s", file, gnutls_strerror(ret));
537 gnutls_certificate_set_dh_params(nc->creds, dhparams());
541 static void readncdir(struct ncredbuf *buf, char *dir, gnutls_x509_privkey_t defkey)
547 if((d = opendir(dir)) == NULL) {
548 flog(LOG_ERR, "ssl: could not read certificate directory %s: %s", dir, strerror(errno));
551 while((e = readdir(d)) != NULL) {
552 if(e->d_name[0] == '.')
554 if((es = strlen(e->d_name)) <= 4)
556 if(strcmp(e->d_name + es - 4, ".crt"))
558 bufadd(*buf, readncreds(sprintf3("%s/%s", dir, e->d_name), defkey));
563 void handlegnussl(int argc, char **argp, char **argv)
565 int i, ret, port, fd;
566 gnutls_certificate_credentials_t creds;
567 gnutls_priority_t ciphers;
568 gnutls_x509_privkey_t defkey;
569 struct ncredbuf ncreds;
570 struct charvbuf ncertf, ncertd;
572 char *crtfile, *keyfile, *perr;
579 gnutls_certificate_allocate_credentials(&creds);
580 keyfile = crtfile = NULL;
582 for(i = 0; i < argc; i++) {
583 if(!strcmp(argp[i], "help")) {
584 printf("ssl handler parameters:\n");
585 printf("\tcert=CERT-FILE [mandatory]\n");
586 printf("\t\tThe name of the file to read the certificate from.\n");
587 printf("\tkey=KEY-FILE [same as CERT-FILE]\n");
588 printf("\t\tThe name of the file to read the private key from.\n");
589 printf("\tprio=PRIORITIES [NORMAL]\n");
590 printf("\t\tCiphersuite priorities, as a GnuTLS priority string.\n");
591 printf("\ttrust=CA-FILE [no default]\n");
592 printf("\t\tThe name of a file to read trusted certificates from.\n");
593 printf("\t\tMay be given multiple times.\n");
594 printf("\tcrl=CRL-FILE [no default]\n");
595 printf("\t\tThe name of a file to read revocation lists from.\n");
596 printf("\t\tMay be given multiple times.\n");
597 printf("\tncert=CERT-FILE [no default]\n");
598 printf("\t\tThe name of a file to read a named certificate from,\n");
599 printf("\t\tfor use with SNI-enabled clients.\n");
600 printf("\t\tMay be given multiple times.\n");
601 printf("\tncertdir=DIR [no default]\n");
602 printf("\t\tRead all *.crt files in the given directory as if they\n");
603 printf("\t\twere given with `ncert' options.\n");
604 printf("\t\tMay be given multiple times.\n");
605 printf("\tport=PORT [443]\n");
606 printf("\t\tThe TCP port to listen on.\n");
608 printf("\tAll X.509 data files must be PEM-encoded.\n");
609 printf("\tIf any certificates were given with `ncert' options, they will be\n");
610 printf("\tused if a client explicitly names one of them with a\n");
611 printf("\tserver-name indication. If a client indicates no server name,\n");
612 printf("\tor if a server-name indication does not match any given\n");
613 printf("\tcertificate, the certificate given with the `cert' option will\n");
614 printf("\tbe used instead.\n");
616 } else if(!strcmp(argp[i], "cert")) {
618 } else if(!strcmp(argp[i], "key")) {
620 } else if(!strcmp(argp[i], "prio")) {
622 gnutls_priority_deinit(ciphers);
623 ret = gnutls_priority_init(&ciphers, argv[i], (const char **)&perr);
624 if(ret == GNUTLS_E_INVALID_REQUEST) {
625 flog(LOG_ERR, "ssl: invalid cipher priority string, at `%s'", perr);
627 } else if(ret != 0) {
628 flog(LOG_ERR, "ssl: could not initialize cipher priorities: %s", gnutls_strerror(ret));
631 } else if(!strcmp(argp[i], "trust")) {
632 if((ret = gnutls_certificate_set_x509_trust_file(creds, argv[i], GNUTLS_X509_FMT_PEM)) != 0) {
633 flog(LOG_ERR, "ssl: could not load trust file `%s': %s", argv[i], gnutls_strerror(ret));
636 for(i = 0; i < ncreds.d; i++) {
637 if((ret = gnutls_certificate_set_x509_trust_file(ncreds.b[i]->creds, argv[i], GNUTLS_X509_FMT_PEM)) != 0) {
638 flog(LOG_ERR, "ssl: could not load trust file `%s': %s", argv[i], gnutls_strerror(ret));
642 } else if(!strcmp(argp[i], "crl")) {
643 if((ret = gnutls_certificate_set_x509_crl_file(creds, argv[i], GNUTLS_X509_FMT_PEM)) != 0) {
644 flog(LOG_ERR, "ssl: could not load CRL file `%s': %s", argv[i], gnutls_strerror(ret));
647 for(i = 0; i < ncreds.d; i++) {
648 if((ret = gnutls_certificate_set_x509_crl_file(ncreds.b[i]->creds, argv[i], GNUTLS_X509_FMT_PEM)) != 0) {
649 flog(LOG_ERR, "ssl: could not load CRL file `%s': %s", argv[i], gnutls_strerror(ret));
653 } else if(!strcmp(argp[i], "port")) {
654 port = atoi(argv[i]);
655 } else if(!strcmp(argp[i], "ncert")) {
656 bufadd(ncertf, argv[i]);
657 } else if(!strcmp(argp[i], "ncertdir")) {
658 bufadd(ncertd, argv[i]);
660 flog(LOG_ERR, "unknown parameter `%s' to ssl handler", argp[i]);
664 if(crtfile == NULL) {
665 flog(LOG_ERR, "ssl: needs certificate file at the very least");
668 if((fd = listensock6(port)) < 0) {
669 flog(LOG_ERR, "could not listen on IPv6 port (port %i): %s", port, strerror(errno));
674 if((ret = gnutls_certificate_set_x509_key_file(creds, crtfile, keyfile, GNUTLS_X509_FMT_PEM)) != 0) {
675 flog(LOG_ERR, "ssl: could not load certificate or key: %s", gnutls_strerror(ret));
678 if((ciphers == NULL) && ((ret = gnutls_priority_init(&ciphers, "NORMAL", NULL)) != 0)) {
679 flog(LOG_ERR, "ssl: could not initialize cipher priorities: %s", gnutls_strerror(ret));
682 if((ret = gnutls_certificate_get_x509_key(creds, 0, &defkey)) != 0) {
683 flog(LOG_ERR, "ssl: could not get default key: %s", gnutls_strerror(ret));
686 for(i = 0; i < ncertf.d; i++)
687 bufadd(ncreds, readncreds(ncertf.b[i], defkey));
688 for(i = 0; i < ncertd.d; i++)
689 readncdir(&ncreds, ncertd.b[i], defkey);
692 gnutls_certificate_set_dh_params(creds, dhparams());
693 bufadd(ncreds, NULL);
698 pd->ncreds = ncreds.b;
699 pd->ciphers = ciphers;
700 bufadd(listeners, mustart(listenloop, pd));
701 if((fd = listensock4(port)) < 0) {
702 if(errno != EADDRINUSE) {
703 flog(LOG_ERR, "could not listen on IPv4 port (port %i): %s", port, strerror(errno));
711 pd->ncreds = ncreds.b;
712 pd->ciphers = ciphers;
713 bufadd(listeners, mustart(listenloop, pd));