[ashd.git] / src / ssl-gnutls.c

/*
    ashd - A Sane HTTP Daemon
    Copyright (C) 2008  Fredrik Tolf <fredrik@dolda2000.com>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <dirent.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <utils.h>
#include <mt.h>
#include <mtio.h>
#include <req.h>
#include <log.h>

#include "htparser.h"

#ifdef HAVE_GNUTLS

#include <gnutls/gnutls.h>
#include <gnutls/x509.h>

struct namedcreds {
    char **names;
    gnutls_certificate_credentials_t creds;
};

struct ncredbuf {
    struct namedcreds **b;
    size_t s, d;
};

struct sslport {
    int fd;
    int sport;
    gnutls_certificate_credentials_t creds;
    struct namedcreds **ncreds;
};

struct sslconn {
    int fd;
    struct sslport *port;
    struct sockaddr_storage name;
    gnutls_session_t sess;
    struct charbuf in;
};

static int tlsblock(int fd, gnutls_session_t sess, time_t to)
{
    if(gnutls_record_get_direction(sess))
	return(block(fd, EV_WRITE, to));
    else
	return(block(fd, EV_READ, to));
}

static ssize_t sslread(void *cookie, char *buf, size_t len)
{
    struct sslconn *ssl = cookie;
    ssize_t xf;
    int ret;

    while(ssl->in.d == 0) {
	sizebuf(ssl->in, ssl->in.d + 1024);
	ret = gnutls_record_recv(ssl->sess, ssl->in.b + ssl->in.d, ssl->in.s - ssl->in.d);
	if((ret == GNUTLS_E_INTERRUPTED) || (ret == GNUTLS_E_AGAIN)) {
	    if(tlsblock(ssl->fd, ssl->sess, 60) == 0) {
		errno = ETIMEDOUT;
		return(-1);
	    }
	} else if(ret < 0) {
	    errno = EIO;
	    return(-1);
	} else if(ret == 0) {
	    return(0);
	} else {
	    ssl->in.d += ret;
	}
    }
    xf = min(ssl->in.d, len);
    memcpy(buf, ssl->in.b, xf);
    memmove(ssl->in.b, ssl->in.b + xf, ssl->in.d -= xf);
    return(xf);
}

static ssize_t sslwrite(void *cookie, const char *buf, size_t len)
{
    struct sslconn *ssl = cookie;
    int ret;
    size_t off;
    
    off = 0;
    while(off < len) {
	ret = gnutls_record_send(ssl->sess, buf + off, len - off);
	if((ret == GNUTLS_E_INTERRUPTED) || (ret == GNUTLS_E_AGAIN)) {
	    if(tlsblock(ssl->fd, ssl->sess, 60) == 0) {
		if(off == 0) {
		    errno = ETIMEDOUT;
		    return(-1);
		}
		return(off);
	    }
	} else if(ret < 0) {
	    if(off == 0) {
		errno = EIO;
		return(-1);
	    }
	    return(off);
	} else {
	    off += ret;
	}
    }
    return(off);
}

static int sslclose(void *cookie)
{
    struct sslconn *ssl = cookie;
    
    buffree(ssl->in);
    return(0);
}

static cookie_io_functions_t iofuns = {
    .read = sslread,
    .write = sslwrite,
    .close = sslclose,
};

static int initreq(struct conn *conn, struct hthead *req)
{
    struct sslconn *ssl = conn->pdata;
    struct sockaddr_storage sa;
    socklen_t salen;
    char nmbuf[256];
    
    headappheader(req, "X-Ash-Address", formathaddress((struct sockaddr *)&ssl->name, sizeof(sa)));
    if(ssl->name.ss_family == AF_INET) {
	headappheader(req, "X-Ash-Address", inet_ntop(AF_INET, &((struct sockaddr_in *)&ssl->name)->sin_addr, nmbuf, sizeof(nmbuf)));
	headappheader(req, "X-Ash-Port", sprintf3("%i", ntohs(((struct sockaddr_in *)&ssl->name)->sin_port)));
    } else if(ssl->name.ss_family == AF_INET6) {
	headappheader(req, "X-Ash-Address", inet_ntop(AF_INET6, &((struct sockaddr_in6 *)&ssl->name)->sin6_addr, nmbuf, sizeof(nmbuf)));
	headappheader(req, "X-Ash-Port", sprintf3("%i", ntohs(((struct sockaddr_in6 *)&ssl->name)->sin6_port)));
    }
    salen = sizeof(sa);
    if(!getsockname(ssl->fd, (struct sockaddr *)&sa, &salen))
	headappheader(req, "X-Ash-Server-Address", formathaddress((struct sockaddr *)&sa, sizeof(sa)));
    headappheader(req, "X-Ash-Server-Port", sprintf3("%i", ssl->port->sport));
    headappheader(req, "X-Ash-Protocol", "https");
    return(0);
}

static void servessl(struct muth *muth, va_list args)
{
    vavar(int, fd);
    vavar(struct sockaddr_storage, name);
    vavar(struct sslport *, pd);
    struct conn conn;
    struct sslconn ssl;
    gnutls_session_t sess;
    int ret;
    FILE *in;
    
    int setcreds(gnutls_session_t sess)
    {
	int i, o, u;
	unsigned int ntype;
	char nambuf[256];
	size_t namlen;
	
	for(i = 0; 1; i++) {
	    namlen = sizeof(nambuf);
	    if(gnutls_server_name_get(sess, nambuf, &namlen, &ntype, i) != 0)
		break;
	    if(ntype != GNUTLS_NAME_DNS)
		continue;
	    for(o = 0; pd->ncreds[o] != NULL; o++) {
		for(u = 0; pd->ncreds[o]->names[u] != NULL; u++) {
		    if(!strcmp(pd->ncreds[o]->names[u], nambuf)) {
			gnutls_credentials_set(sess, GNUTLS_CRD_CERTIFICATE, pd->ncreds[o]->creds);
			gnutls_certificate_server_set_request(sess, GNUTLS_CERT_REQUEST);
			return(0);
		    }
		}
	    }
	}
	gnutls_credentials_set(sess, GNUTLS_CRD_CERTIFICATE, pd->creds);
	gnutls_certificate_server_set_request(sess, GNUTLS_CERT_REQUEST);
	return(0);
    }

    fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK);
    gnutls_init(&sess, GNUTLS_SERVER);
    gnutls_set_default_priority(sess);
    gnutls_handshake_set_post_client_hello_function(sess, setcreds);
    gnutls_transport_set_ptr(sess, (gnutls_transport_ptr_t)(intptr_t)fd);
    while((ret = gnutls_handshake(sess)) != 0) {
	if((ret != GNUTLS_E_INTERRUPTED) && (ret != GNUTLS_E_AGAIN))
	    goto out;
	if(tlsblock(fd, sess, 60) <= 0)
	    goto out;
    }
    memset(&conn, 0, sizeof(conn));
    memset(&ssl, 0, sizeof(ssl));
    conn.pdata = &ssl;
    conn.initreq = initreq;
    ssl.fd = fd;
    ssl.port = pd;
    ssl.name = name;
    ssl.sess = sess;
    bufinit(ssl.in);
    in = fopencookie(&ssl, "r+", iofuns);
    serve(in, &conn);
    
out:
    gnutls_deinit(sess);
    close(fd);
}

static void listenloop(struct muth *muth, va_list args)
{
    vavar(struct sslport *, pd);
    int ns;
    struct sockaddr_storage name;
    socklen_t namelen;
    
    while(1) {
	namelen = sizeof(name);
	block(pd->fd, EV_READ, 0);
	ns = accept(pd->fd, (struct sockaddr *)&name, &namelen);
	if(ns < 0) {
	    flog(LOG_ERR, "accept: %s", strerror(errno));
	    goto out;
	}
	mustart(servessl, ns, name, pd);
    }
    
out:
    close(pd->fd);
    free(pd);
}

static gnutls_dh_params_t dhparams(void)
{
    static int inited = 0;
    static gnutls_dh_params_t pars;
    int ret;
    
    if(!inited) {
	if(((ret = gnutls_dh_params_init(&pars)) != 0) ||
	   ((ret = gnutls_dh_params_generate2(pars, 2048)) != 0)) {
	    flog(LOG_ERR, "GnuTLS could not generate Diffie-Hellman parameters: %s", gnutls_strerror(ret));
	    exit(1);
	}
	inited = 1;
    }
    return(pars);
}

static void init(void)
{
    static int inited = 0;
    int ret;
    
    if(inited)
	return;
    inited = 1;
    if((ret = gnutls_global_init()) != 0) {
	flog(LOG_ERR, "could not initialize GnuTLS: %s", gnutls_strerror(ret));
	exit(1);
    }
}

static struct namedcreds *readncreds(char *file)
{
    int i, fd, ret;
    struct namedcreds *nc;
    gnutls_x509_crt_t crt;
    gnutls_x509_privkey_t key;
    char cn[1024];
    size_t cnl;
    gnutls_datum_t d;
    struct charbuf keybuf;
    struct charvbuf names;
    unsigned int type;
    
    bufinit(keybuf);
    bufinit(names);
    if((fd = open(file, O_RDONLY)) < 0) {
	flog(LOG_ERR, "ssl: %s: %s", file, strerror(errno));
	exit(1);
    }
    while(1) {
	sizebuf(keybuf, keybuf.d + 1024);
	ret = read(fd, keybuf.b + keybuf.d, keybuf.s - keybuf.d);
	if(ret < 0) {
	    flog(LOG_ERR, "ssl: reading from %s: %s", file, strerror(errno));
	    exit(1);
	} else if(ret == 0) {
	    break;
	}
	keybuf.d += ret;
    }
    close(fd);
    d.data = (unsigned char *)keybuf.b;
    d.size = keybuf.d;
    gnutls_x509_crt_init(&crt);
    if((ret = gnutls_x509_crt_import(crt, &d, GNUTLS_X509_FMT_PEM)) != 0) {
	flog(LOG_ERR, "ssl: could not load certificate from %s: %s", file, gnutls_strerror(ret));
	exit(1);
    }
    cnl = sizeof(cn) - 1;
    if((ret = gnutls_x509_crt_get_dn_by_oid(crt, GNUTLS_OID_X520_COMMON_NAME, 0, 0, cn, &cnl)) != 0) {
	flog(LOG_ERR, "ssl: could not read common name from %s: %s", file, gnutls_strerror(ret));
	exit(1);
    }
    cn[cnl] = 0;
    bufadd(names, sstrdup(cn));
    for(i = 0; 1; i++) {
	cnl = sizeof(cn) - 1;
	if(gnutls_x509_crt_get_subject_alt_name2(crt, i, cn, &cnl, &type, NULL) < 0)
	    break;
	cn[cnl] = 0;
	if(type == GNUTLS_SAN_DNSNAME)
	    bufadd(names, sstrdup(cn));
    }
    gnutls_x509_privkey_init(&key);
    if((ret = gnutls_x509_privkey_import(key, &d, GNUTLS_X509_FMT_PEM)) != 0) {
	flog(LOG_ERR, "ssl: could not load key from %s: %s", file, gnutls_strerror(ret));
	exit(1);
    }
    buffree(keybuf);
    bufadd(names, NULL);
    omalloc(nc);
    nc->names = names.b;
    gnutls_certificate_allocate_credentials(&nc->creds);
    if((ret = gnutls_certificate_set_x509_key(nc->creds, &crt, 1, key)) != 0) {
	flog(LOG_ERR, "ssl: could not use certificate from %s: %s", file, gnutls_strerror(ret));
	exit(1);
    }
    gnutls_certificate_set_dh_params(nc->creds, dhparams());
    return(nc);
}

static void readncdir(struct ncredbuf *buf, char *dir)
{
    DIR *d;
    struct dirent *e;
    size_t es;
    
    if((d = opendir(dir)) == NULL) {
	flog(LOG_ERR, "ssl: could not read certificate directory %s: %s", dir, strerror(errno));
	exit(1);
    }
    while((e = readdir(d)) != NULL) {
	if(e->d_name[0] == '.')
	    continue;
	if((es = strlen(e->d_name)) <= 4)
	    continue;
	if(strcmp(e->d_name + es - 4, ".crt"))
	    continue;
	bufadd(*buf, readncreds(sprintf3("%s/%s", dir, e->d_name)));
    }
    closedir(d);
}

void handlegnussl(int argc, char **argp, char **argv)
{
    int i, ret, port, fd;
    gnutls_certificate_credentials_t creds;
    struct ncredbuf ncreds;
    struct sslport *pd;
    char *crtfile, *keyfile;
    
    init();
    port = 443;
    bufinit(ncreds);
    gnutls_certificate_allocate_credentials(&creds);
    keyfile = crtfile = NULL;
    for(i = 0; i < argc; i++) {
	if(!strcmp(argp[i], "help")) {
	    printf("ssl handler parameters:\n");
	    printf("\tcert=CERT-FILE  [mandatory]\n");
	    printf("\t\tThe name of the file to read the certificate from.\n");
	    printf("\tkey=KEY-FILE    [same as CERT-FILE]\n");
	    printf("\t\tThe name of the file to read the private key from.\n");
	    printf("\ttrust=CA-FILE   [no default]\n");
	    printf("\t\tThe name of a file to read trusted certificates from.\n");
	    printf("\t\tMay be given multiple times.\n");
	    printf("\tcrl=CRL-FILE    [no default]\n");
	    printf("\t\tThe name of a file to read revocation lists from.\n");
	    printf("\t\tMay be given multiple times.\n");
	    printf("\tncert=CERT-FILE [no default]\n");
	    printf("\t\tThe name of a file to read a named certificate from,\n");
	    printf("\t\tfor use with SNI-enabled clients.\n");
	    printf("\t\tMay be given multiple times.\n");
	    printf("\tncertdir=DIR    [no default]\n");
	    printf("\t\tRead all *.crt files in the given directory as if they\n");
	    printf("\t\twere given with `ncert' options.\n");
	    printf("\t\tMay be given multiple times.\n");
	    printf("\tport=PORT       [443]\n");
	    printf("\t\tThe TCP port to listen on.\n");
	    printf("\n");
	    printf("\tAll X.509 data files must be PEM-encoded.\n");
	    printf("\tIf any certificates were given with `ncert' options, they will be\n");
	    printf("\tused if a client explicitly names one of them with a\n");
	    printf("\tserver-name indication. If a client indicates no server name,\n");
	    printf("\tor if a server-name indication does not match any given\n");
	    printf("\tcertificate, the certificate given with the `cert' option will\n");
	    printf("\tbe used instead.\n");
	    exit(0);
	} else if(!strcmp(argp[i], "cert")) {
	    crtfile = argv[i];
	} else if(!strcmp(argp[i], "key")) {
	    keyfile = argv[i];
	} else if(!strcmp(argp[i], "trust")) {
	    if((ret = gnutls_certificate_set_x509_trust_file(creds, argv[i], GNUTLS_X509_FMT_PEM)) != 0) {
		flog(LOG_ERR, "ssl: could not load trust file `%s': %s", argv[i], gnutls_strerror(ret));
		exit(1);
	    }
	    for(i = 0; i < ncreds.d; i++) {
		if((ret = gnutls_certificate_set_x509_trust_file(ncreds.b[i]->creds, argv[i], GNUTLS_X509_FMT_PEM)) != 0) {
		    flog(LOG_ERR, "ssl: could not load trust file `%s': %s", argv[i], gnutls_strerror(ret));
		    exit(1);
		}
	    }
	} else if(!strcmp(argp[i], "crl")) {
	    if((ret = gnutls_certificate_set_x509_crl_file(creds, argv[i], GNUTLS_X509_FMT_PEM)) != 0) {
		flog(LOG_ERR, "ssl: could not load CRL file `%s': %s", argv[i], gnutls_strerror(ret));
		exit(1);
	    }
	    for(i = 0; i < ncreds.d; i++) {
		if((ret = gnutls_certificate_set_x509_crl_file(ncreds.b[i]->creds, argv[i], GNUTLS_X509_FMT_PEM)) != 0) {
		    flog(LOG_ERR, "ssl: could not load CRL file `%s': %s", argv[i], gnutls_strerror(ret));
		    exit(1);
		}
	    }
	} else if(!strcmp(argp[i], "port")) {
	    port = atoi(argv[i]);
	} else if(!strcmp(argp[i], "ncert")) {
	    bufadd(ncreds, readncreds(argv[i]));
	} else if(!strcmp(argp[i], "ncertdir")) {
	    readncdir(&ncreds, argv[i]);
	} else {
	    flog(LOG_ERR, "unknown parameter `%s' to ssl handler", argp[i]);
	    exit(1);
	}
    }
    if(crtfile == NULL) {
	flog(LOG_ERR, "ssl: needs certificate file at the very least");
	exit(1);
    }
    if((fd = listensock6(port)) < 0) {
	flog(LOG_ERR, "could not listen on IPv6 port (port %i): %s", port, strerror(errno));
	exit(1);
    }
    if(keyfile == NULL)
	keyfile = crtfile;
    if((ret = gnutls_certificate_set_x509_key_file(creds, crtfile, keyfile, GNUTLS_X509_FMT_PEM)) != 0) {
	flog(LOG_ERR, "ssl: could not load certificate or key: %s", gnutls_strerror(ret));
	exit(1);
    }
    gnutls_certificate_set_dh_params(creds, dhparams());
    bufadd(ncreds, NULL);
    omalloc(pd);
    pd->fd = fd;
    pd->sport = port;
    pd->creds = creds;
    pd->ncreds = ncreds.b;
    mustart(listenloop, pd);
    if((fd = listensock6(port)) < 0) {
	if(errno != EADDRINUSE) {
	    flog(LOG_ERR, "could not listen on IPv6 port (port %i): %s", port, strerror(errno));
	    exit(1);
	}
    } else {
	omalloc(pd);
	pd->fd = fd;
	pd->sport = port;
	pd->creds = creds;
	mustart(listenloop, pd);
    }
}

#endif
Commit	Line	Data
	1	/*
	2	ashd - A Sane HTTP Daemon
	3	Copyright (C) 2008 Fredrik Tolf <fredrik@dolda2000.com>
	4
	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.
	9
	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.
	14
	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/>.
	17	*/
	18
	19	#include <stdlib.h>
	20	#include <unistd.h>
	21	#include <string.h>
	22	#include <fcntl.h>
	23	#include <dirent.h>
	24	#include <sys/socket.h>
	25	#include <netinet/in.h>
	26	#include <arpa/inet.h>
	27	#include <errno.h>
	28
	29	#ifdef HAVE_CONFIG_H
	30	#include <config.h>
	31	#endif
	32	#include <utils.h>
	33	#include <mt.h>
	34	#include <mtio.h>
	35	#include <req.h>
	36	#include <log.h>
	37
	38	#include "htparser.h"
	39
	40	#ifdef HAVE_GNUTLS
	41
	42	#include <gnutls/gnutls.h>
	43	#include <gnutls/x509.h>
	44
	45	struct namedcreds {
	46	char **names;
	47	gnutls_certificate_credentials_t creds;
	48	};
	49
	50	struct ncredbuf {
	51	struct namedcreds **b;
	52	size_t s, d;
	53	};
	54
	55	struct sslport {
	56	int fd;
	57	int sport;
	58	gnutls_certificate_credentials_t creds;
	59	struct namedcreds **ncreds;
	60	};
	61
	62	struct sslconn {
	63	int fd;
	64	struct sslport *port;
	65	struct sockaddr_storage name;
	66	gnutls_session_t sess;
	67	struct charbuf in;
	68	};
	69
	70	static int tlsblock(int fd, gnutls_session_t sess, time_t to)
	71	{
	72	if(gnutls_record_get_direction(sess))
	73	return(block(fd, EV_WRITE, to));
	74	else
	75	return(block(fd, EV_READ, to));
	76	}
	77
	78	static ssize_t sslread(void cookie, char buf, size_t len)
	79	{
	80	struct sslconn *ssl = cookie;
	81	ssize_t xf;
	82	int ret;
	83
	84	while(ssl->in.d == 0) {
	85	sizebuf(ssl->in, ssl->in.d + 1024);
	86	ret = gnutls_record_recv(ssl->sess, ssl->in.b + ssl->in.d, ssl->in.s - ssl->in.d);
	87	if((ret == GNUTLS_E_INTERRUPTED) \|\| (ret == GNUTLS_E_AGAIN)) {
	88	if(tlsblock(ssl->fd, ssl->sess, 60) == 0) {
	89	errno = ETIMEDOUT;
	90	return(-1);
	91	}
	92	} else if(ret < 0) {
	93	errno = EIO;
	94	return(-1);
	95	} else if(ret == 0) {
	96	return(0);
	97	} else {
	98	ssl->in.d += ret;
	99	}
	100	}
	101	xf = min(ssl->in.d, len);
	102	memcpy(buf, ssl->in.b, xf);
	103	memmove(ssl->in.b, ssl->in.b + xf, ssl->in.d -= xf);
	104	return(xf);
	105	}
	106
	107	static ssize_t sslwrite(void cookie, const char buf, size_t len)
	108	{
	109	struct sslconn *ssl = cookie;
	110	int ret;
	111	size_t off;
	112
	113	off = 0;
	114	while(off < len) {
	115	ret = gnutls_record_send(ssl->sess, buf + off, len - off);
	116	if((ret == GNUTLS_E_INTERRUPTED) \|\| (ret == GNUTLS_E_AGAIN)) {
	117	if(tlsblock(ssl->fd, ssl->sess, 60) == 0) {
	118	if(off == 0) {
	119	errno = ETIMEDOUT;
	120	return(-1);
	121	}
	122	return(off);
	123	}
	124	} else if(ret < 0) {
	125	if(off == 0) {
	126	errno = EIO;
	127	return(-1);
	128	}
	129	return(off);
	130	} else {
	131	off += ret;
	132	}
	133	}
	134	return(off);
	135	}
	136
	137	static int sslclose(void *cookie)
	138	{
	139	struct sslconn *ssl = cookie;
	140
	141	buffree(ssl->in);
	142	return(0);
	143	}
	144
	145	static cookie_io_functions_t iofuns = {
	146	.read = sslread,
	147	.write = sslwrite,
	148	.close = sslclose,
	149	};
	150
	151	static int initreq(struct conn conn, struct hthead req)
	152	{
	153	struct sslconn *ssl = conn->pdata;
	154	struct sockaddr_storage sa;
	155	socklen_t salen;
	156	char nmbuf[256];
	157
	158	headappheader(req, "X-Ash-Address", formathaddress((struct sockaddr *)&ssl->name, sizeof(sa)));
	159	if(ssl->name.ss_family == AF_INET) {
	160	headappheader(req, "X-Ash-Address", inet_ntop(AF_INET, &((struct sockaddr_in *)&ssl->name)->sin_addr, nmbuf, sizeof(nmbuf)));
	161	headappheader(req, "X-Ash-Port", sprintf3("%i", ntohs(((struct sockaddr_in *)&ssl->name)->sin_port)));
	162	} else if(ssl->name.ss_family == AF_INET6) {
	163	headappheader(req, "X-Ash-Address", inet_ntop(AF_INET6, &((struct sockaddr_in6 *)&ssl->name)->sin6_addr, nmbuf, sizeof(nmbuf)));
	164	headappheader(req, "X-Ash-Port", sprintf3("%i", ntohs(((struct sockaddr_in6 *)&ssl->name)->sin6_port)));
	165	}
	166	salen = sizeof(sa);
	167	if(!getsockname(ssl->fd, (struct sockaddr *)&sa, &salen))
	168	headappheader(req, "X-Ash-Server-Address", formathaddress((struct sockaddr *)&sa, sizeof(sa)));
	169	headappheader(req, "X-Ash-Server-Port", sprintf3("%i", ssl->port->sport));
	170	headappheader(req, "X-Ash-Protocol", "https");
	171	return(0);
	172	}
	173
	174	static void servessl(struct muth *muth, va_list args)
	175	{
	176	vavar(int, fd);
	177	vavar(struct sockaddr_storage, name);
	178	vavar(struct sslport *, pd);
	179	struct conn conn;
	180	struct sslconn ssl;
	181	gnutls_session_t sess;
	182	int ret;
	183	FILE *in;
	184
	185	int setcreds(gnutls_session_t sess)
	186	{
	187	int i, o, u;
	188	unsigned int ntype;
	189	char nambuf[256];
	190	size_t namlen;
	191
	192	for(i = 0; 1; i++) {
	193	namlen = sizeof(nambuf);
	194	if(gnutls_server_name_get(sess, nambuf, &namlen, &ntype, i) != 0)
	195	break;
	196	if(ntype != GNUTLS_NAME_DNS)
	197	continue;
	198	for(o = 0; pd->ncreds[o] != NULL; o++) {
	199	for(u = 0; pd->ncreds[o]->names[u] != NULL; u++) {
	200	if(!strcmp(pd->ncreds[o]->names[u], nambuf)) {
	201	gnutls_credentials_set(sess, GNUTLS_CRD_CERTIFICATE, pd->ncreds[o]->creds);
	202	gnutls_certificate_server_set_request(sess, GNUTLS_CERT_REQUEST);
	203	return(0);
	204	}
	205	}
	206	}
	207	}
	208	gnutls_credentials_set(sess, GNUTLS_CRD_CERTIFICATE, pd->creds);
	209	gnutls_certificate_server_set_request(sess, GNUTLS_CERT_REQUEST);
	210	return(0);
	211	}
	212
	213	fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) \| O_NONBLOCK);
	214	gnutls_init(&sess, GNUTLS_SERVER);
	215	gnutls_set_default_priority(sess);
	216	gnutls_handshake_set_post_client_hello_function(sess, setcreds);
	217	gnutls_transport_set_ptr(sess, (gnutls_transport_ptr_t)(intptr_t)fd);
	218	while((ret = gnutls_handshake(sess)) != 0) {
	219	if((ret != GNUTLS_E_INTERRUPTED) && (ret != GNUTLS_E_AGAIN))
	220	goto out;
	221	if(tlsblock(fd, sess, 60) <= 0)
	222	goto out;
	223	}
	224	memset(&conn, 0, sizeof(conn));
	225	memset(&ssl, 0, sizeof(ssl));
	226	conn.pdata = &ssl;
	227	conn.initreq = initreq;
	228	ssl.fd = fd;
	229	ssl.port = pd;
	230	ssl.name = name;
	231	ssl.sess = sess;
	232	bufinit(ssl.in);
	233	in = fopencookie(&ssl, "r+", iofuns);
	234	serve(in, &conn);
	235
	236	out:
	237	gnutls_deinit(sess);
	238	close(fd);
	239	}
	240
	241	static void listenloop(struct muth *muth, va_list args)
	242	{
	243	vavar(struct sslport *, pd);
	244	int ns;
	245	struct sockaddr_storage name;
	246	socklen_t namelen;
	247
	248	while(1) {
	249	namelen = sizeof(name);
	250	block(pd->fd, EV_READ, 0);
	251	ns = accept(pd->fd, (struct sockaddr *)&name, &namelen);
	252	if(ns < 0) {
	253	flog(LOG_ERR, "accept: %s", strerror(errno));
	254	goto out;
	255	}
	256	mustart(servessl, ns, name, pd);
	257	}
	258
	259	out:
	260	close(pd->fd);
	261	free(pd);
	262	}
	263
	264	static gnutls_dh_params_t dhparams(void)
	265	{
	266	static int inited = 0;
	267	static gnutls_dh_params_t pars;
	268	int ret;
	269
	270	if(!inited) {
	271	if(((ret = gnutls_dh_params_init(&pars)) != 0) \|\|
	272	((ret = gnutls_dh_params_generate2(pars, 2048)) != 0)) {
	273	flog(LOG_ERR, "GnuTLS could not generate Diffie-Hellman parameters: %s", gnutls_strerror(ret));
	274	exit(1);
	275	}
	276	inited = 1;
	277	}
	278	return(pars);
	279	}
	280
	281	static void init(void)
	282	{
	283	static int inited = 0;
	284	int ret;
	285
	286	if(inited)
	287	return;
	288	inited = 1;
	289	if((ret = gnutls_global_init()) != 0) {
	290	flog(LOG_ERR, "could not initialize GnuTLS: %s", gnutls_strerror(ret));
	291	exit(1);
	292	}
	293	}
	294
	295	static struct namedcreds readncreds(char file)
	296	{
	297	int i, fd, ret;
	298	struct namedcreds *nc;
	299	gnutls_x509_crt_t crt;
	300	gnutls_x509_privkey_t key;
	301	char cn[1024];
	302	size_t cnl;
	303	gnutls_datum_t d;
	304	struct charbuf keybuf;
	305	struct charvbuf names;
	306	unsigned int type;
	307
	308	bufinit(keybuf);
	309	bufinit(names);
	310	if((fd = open(file, O_RDONLY)) < 0) {
	311	flog(LOG_ERR, "ssl: %s: %s", file, strerror(errno));
	312	exit(1);
	313	}
	314	while(1) {
	315	sizebuf(keybuf, keybuf.d + 1024);
	316	ret = read(fd, keybuf.b + keybuf.d, keybuf.s - keybuf.d);
	317	if(ret < 0) {
	318	flog(LOG_ERR, "ssl: reading from %s: %s", file, strerror(errno));
	319	exit(1);
	320	} else if(ret == 0) {
	321	break;
	322	}
	323	keybuf.d += ret;
	324	}
	325	close(fd);
	326	d.data = (unsigned char *)keybuf.b;
	327	d.size = keybuf.d;
	328	gnutls_x509_crt_init(&crt);
	329	if((ret = gnutls_x509_crt_import(crt, &d, GNUTLS_X509_FMT_PEM)) != 0) {
	330	flog(LOG_ERR, "ssl: could not load certificate from %s: %s", file, gnutls_strerror(ret));
	331	exit(1);
	332	}
	333	cnl = sizeof(cn) - 1;
	334	if((ret = gnutls_x509_crt_get_dn_by_oid(crt, GNUTLS_OID_X520_COMMON_NAME, 0, 0, cn, &cnl)) != 0) {
	335	flog(LOG_ERR, "ssl: could not read common name from %s: %s", file, gnutls_strerror(ret));
	336	exit(1);
	337	}
	338	cn[cnl] = 0;
	339	bufadd(names, sstrdup(cn));
	340	for(i = 0; 1; i++) {
	341	cnl = sizeof(cn) - 1;
	342	if(gnutls_x509_crt_get_subject_alt_name2(crt, i, cn, &cnl, &type, NULL) < 0)
	343	break;
	344	cn[cnl] = 0;
	345	if(type == GNUTLS_SAN_DNSNAME)
	346	bufadd(names, sstrdup(cn));
	347	}
	348	gnutls_x509_privkey_init(&key);
	349	if((ret = gnutls_x509_privkey_import(key, &d, GNUTLS_X509_FMT_PEM)) != 0) {
	350	flog(LOG_ERR, "ssl: could not load key from %s: %s", file, gnutls_strerror(ret));
	351	exit(1);
	352	}
	353	buffree(keybuf);
	354	bufadd(names, NULL);
	355	omalloc(nc);
	356	nc->names = names.b;
	357	gnutls_certificate_allocate_credentials(&nc->creds);
	358	if((ret = gnutls_certificate_set_x509_key(nc->creds, &crt, 1, key)) != 0) {
	359	flog(LOG_ERR, "ssl: could not use certificate from %s: %s", file, gnutls_strerror(ret));
	360	exit(1);
	361	}
	362	gnutls_certificate_set_dh_params(nc->creds, dhparams());
	363	return(nc);
	364	}
	365
	366	static void readncdir(struct ncredbuf buf, char dir)
	367	{
	368	DIR *d;
	369	struct dirent *e;
	370	size_t es;
	371
	372	if((d = opendir(dir)) == NULL) {
	373	flog(LOG_ERR, "ssl: could not read certificate directory %s: %s", dir, strerror(errno));
	374	exit(1);
	375	}
	376	while((e = readdir(d)) != NULL) {
	377	if(e->d_name[0] == '.')
	378	continue;
	379	if((es = strlen(e->d_name)) <= 4)
	380	continue;
	381	if(strcmp(e->d_name + es - 4, ".crt"))
	382	continue;
	383	bufadd(*buf, readncreds(sprintf3("%s/%s", dir, e->d_name)));
	384	}
	385	closedir(d);
	386	}
	387
	388	void handlegnussl(int argc, char argp, char argv)
	389	{
	390	int i, ret, port, fd;
	391	gnutls_certificate_credentials_t creds;
	392	struct ncredbuf ncreds;
	393	struct sslport *pd;
	394	char crtfile, keyfile;
	395
	396	init();
	397	port = 443;
	398	bufinit(ncreds);
	399	gnutls_certificate_allocate_credentials(&creds);
	400	keyfile = crtfile = NULL;
	401	for(i = 0; i < argc; i++) {
	402	if(!strcmp(argp[i], "help")) {
	403	printf("ssl handler parameters:\n");
	404	printf("\tcert=CERT-FILE [mandatory]\n");
	405	printf("\t\tThe name of the file to read the certificate from.\n");
	406	printf("\tkey=KEY-FILE [same as CERT-FILE]\n");
	407	printf("\t\tThe name of the file to read the private key from.\n");
	408	printf("\ttrust=CA-FILE [no default]\n");
	409	printf("\t\tThe name of a file to read trusted certificates from.\n");
	410	printf("\t\tMay be given multiple times.\n");
	411	printf("\tcrl=CRL-FILE [no default]\n");
	412	printf("\t\tThe name of a file to read revocation lists from.\n");
	413	printf("\t\tMay be given multiple times.\n");
	414	printf("\tncert=CERT-FILE [no default]\n");
	415	printf("\t\tThe name of a file to read a named certificate from,\n");
	416	printf("\t\tfor use with SNI-enabled clients.\n");
	417	printf("\t\tMay be given multiple times.\n");
	418	printf("\tncertdir=DIR [no default]\n");
	419	printf("\t\tRead all *.crt files in the given directory as if they\n");
	420	printf("\t\twere given with `ncert' options.\n");
	421	printf("\t\tMay be given multiple times.\n");
	422	printf("\tport=PORT [443]\n");
	423	printf("\t\tThe TCP port to listen on.\n");
	424	printf("\n");
	425	printf("\tAll X.509 data files must be PEM-encoded.\n");
	426	printf("\tIf any certificates were given with `ncert' options, they will be\n");
	427	printf("\tused if a client explicitly names one of them with a\n");
	428	printf("\tserver-name indication. If a client indicates no server name,\n");
	429	printf("\tor if a server-name indication does not match any given\n");
	430	printf("\tcertificate, the certificate given with the `cert' option will\n");
	431	printf("\tbe used instead.\n");
	432	exit(0);
	433	} else if(!strcmp(argp[i], "cert")) {
	434	crtfile = argv[i];
	435	} else if(!strcmp(argp[i], "key")) {
	436	keyfile = argv[i];
	437	} else if(!strcmp(argp[i], "trust")) {
	438	if((ret = gnutls_certificate_set_x509_trust_file(creds, argv[i], GNUTLS_X509_FMT_PEM)) != 0) {
	439	flog(LOG_ERR, "ssl: could not load trust file `%s': %s", argv[i], gnutls_strerror(ret));
	440	exit(1);
	441	}
	442	for(i = 0; i < ncreds.d; i++) {
	443	if((ret = gnutls_certificate_set_x509_trust_file(ncreds.b[i]->creds, argv[i], GNUTLS_X509_FMT_PEM)) != 0) {
	444	flog(LOG_ERR, "ssl: could not load trust file `%s': %s", argv[i], gnutls_strerror(ret));
	445	exit(1);
	446	}
	447	}
	448	} else if(!strcmp(argp[i], "crl")) {
	449	if((ret = gnutls_certificate_set_x509_crl_file(creds, argv[i], GNUTLS_X509_FMT_PEM)) != 0) {
	450	flog(LOG_ERR, "ssl: could not load CRL file `%s': %s", argv[i], gnutls_strerror(ret));
	451	exit(1);
	452	}
	453	for(i = 0; i < ncreds.d; i++) {
	454	if((ret = gnutls_certificate_set_x509_crl_file(ncreds.b[i]->creds, argv[i], GNUTLS_X509_FMT_PEM)) != 0) {
	455	flog(LOG_ERR, "ssl: could not load CRL file `%s': %s", argv[i], gnutls_strerror(ret));
	456	exit(1);
	457	}
	458	}
	459	} else if(!strcmp(argp[i], "port")) {
	460	port = atoi(argv[i]);
	461	} else if(!strcmp(argp[i], "ncert")) {
	462	bufadd(ncreds, readncreds(argv[i]));
	463	} else if(!strcmp(argp[i], "ncertdir")) {
	464	readncdir(&ncreds, argv[i]);
	465	} else {
	466	flog(LOG_ERR, "unknown parameter `%s' to ssl handler", argp[i]);
	467	exit(1);
	468	}
	469	}
	470	if(crtfile == NULL) {
	471	flog(LOG_ERR, "ssl: needs certificate file at the very least");
	472	exit(1);
	473	}
	474	if((fd = listensock6(port)) < 0) {
	475	flog(LOG_ERR, "could not listen on IPv6 port (port %i): %s", port, strerror(errno));
	476	exit(1);
	477	}
	478	if(keyfile == NULL)
	479	keyfile = crtfile;
	480	if((ret = gnutls_certificate_set_x509_key_file(creds, crtfile, keyfile, GNUTLS_X509_FMT_PEM)) != 0) {
	481	flog(LOG_ERR, "ssl: could not load certificate or key: %s", gnutls_strerror(ret));
	482	exit(1);
	483	}
	484	gnutls_certificate_set_dh_params(creds, dhparams());
	485	bufadd(ncreds, NULL);
	486	omalloc(pd);
	487	pd->fd = fd;
	488	pd->sport = port;
	489	pd->creds = creds;
	490	pd->ncreds = ncreds.b;
	491	mustart(listenloop, pd);
	492	if((fd = listensock6(port)) < 0) {
	493	if(errno != EADDRINUSE) {
	494	flog(LOG_ERR, "could not listen on IPv6 port (port %i): %s", port, strerror(errno));
	495	exit(1);
	496	}
	497	} else {
	498	omalloc(pd);
	499	pd->fd = fd;
	500	pd->sport = port;
	501	pd->creds = creds;
	502	mustart(listenloop, pd);
	503	}
	504	}
	505
	506	#endif