| 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 <sys/socket.h> |
| 24 | #include <netinet/in.h> |
| 25 | #include <arpa/inet.h> |
| 26 | #include <errno.h> |
| 27 | |
| 28 | #ifdef HAVE_CONFIG_H |
| 29 | #include <config.h> |
| 30 | #endif |
| 31 | #include <utils.h> |
| 32 | #include <mt.h> |
| 33 | #include <mtio.h> |
| 34 | #include <req.h> |
| 35 | #include <log.h> |
| 36 | |
| 37 | #include "htparser.h" |
| 38 | |
| 39 | #ifdef HAVE_GNUTLS |
| 40 | |
| 41 | #include <gnutls/gnutls.h> |
| 42 | |
| 43 | struct sslport { |
| 44 | int fd; |
| 45 | int sport; |
| 46 | gnutls_certificate_credentials_t creds; |
| 47 | }; |
| 48 | |
| 49 | struct sslconn { |
| 50 | int fd; |
| 51 | struct sslport *port; |
| 52 | struct sockaddr_storage name; |
| 53 | gnutls_session_t sess; |
| 54 | struct charbuf in; |
| 55 | }; |
| 56 | |
| 57 | static gnutls_dh_params_t dhparams; |
| 58 | |
| 59 | static int tlsblock(int fd, gnutls_session_t sess, time_t to) |
| 60 | { |
| 61 | if(gnutls_record_get_direction(sess)) |
| 62 | return(block(fd, EV_WRITE, to)); |
| 63 | else |
| 64 | return(block(fd, EV_READ, to)); |
| 65 | } |
| 66 | |
| 67 | static ssize_t sslread(void *cookie, char *buf, size_t len) |
| 68 | { |
| 69 | struct sslconn *ssl = cookie; |
| 70 | ssize_t xf; |
| 71 | int ret; |
| 72 | |
| 73 | while(ssl->in.d == 0) { |
| 74 | sizebuf(ssl->in, ssl->in.d + 1024); |
| 75 | ret = gnutls_record_recv(ssl->sess, ssl->in.b + ssl->in.d, ssl->in.s - ssl->in.d); |
| 76 | if((ret == GNUTLS_E_INTERRUPTED) || (ret == GNUTLS_E_AGAIN)) { |
| 77 | if(tlsblock(ssl->fd, ssl->sess, 60) == 0) { |
| 78 | errno = ETIMEDOUT; |
| 79 | return(-1); |
| 80 | } |
| 81 | } else if(ret < 0) { |
| 82 | errno = EIO; |
| 83 | return(-1); |
| 84 | } else if(ret == 0) { |
| 85 | return(0); |
| 86 | } else { |
| 87 | ssl->in.d += ret; |
| 88 | } |
| 89 | } |
| 90 | xf = min(ssl->in.d, len); |
| 91 | memcpy(buf, ssl->in.b, xf); |
| 92 | memmove(ssl->in.b, ssl->in.b + xf, ssl->in.d -= xf); |
| 93 | return(xf); |
| 94 | } |
| 95 | |
| 96 | static ssize_t sslwrite(void *cookie, const char *buf, size_t len) |
| 97 | { |
| 98 | struct sslconn *ssl = cookie; |
| 99 | int ret; |
| 100 | size_t off; |
| 101 | |
| 102 | off = 0; |
| 103 | while(off < len) { |
| 104 | ret = gnutls_record_send(ssl->sess, buf + off, len - off); |
| 105 | if((ret == GNUTLS_E_INTERRUPTED) || (ret == GNUTLS_E_AGAIN)) { |
| 106 | if(tlsblock(ssl->fd, ssl->sess, 60) == 0) { |
| 107 | if(off == 0) { |
| 108 | errno = ETIMEDOUT; |
| 109 | return(-1); |
| 110 | } |
| 111 | return(off); |
| 112 | } |
| 113 | } else if(ret < 0) { |
| 114 | if(off == 0) { |
| 115 | errno = EIO; |
| 116 | return(-1); |
| 117 | } |
| 118 | return(off); |
| 119 | } else { |
| 120 | off += ret; |
| 121 | } |
| 122 | } |
| 123 | return(off); |
| 124 | } |
| 125 | |
| 126 | static int sslclose(void *cookie) |
| 127 | { |
| 128 | return(0); |
| 129 | } |
| 130 | |
| 131 | static cookie_io_functions_t iofuns = { |
| 132 | .read = sslread, |
| 133 | .write = sslwrite, |
| 134 | .close = sslclose, |
| 135 | }; |
| 136 | |
| 137 | static int initreq(struct conn *conn, struct hthead *req) |
| 138 | { |
| 139 | struct sslconn *ssl = conn->pdata; |
| 140 | struct sockaddr_storage sa; |
| 141 | socklen_t salen; |
| 142 | char nmbuf[256]; |
| 143 | |
| 144 | if(ssl->name.ss_family == AF_INET) { |
| 145 | headappheader(req, "X-Ash-Address", inet_ntop(AF_INET, &((struct sockaddr_in *)&ssl->name)->sin_addr, nmbuf, sizeof(nmbuf))); |
| 146 | headappheader(req, "X-Ash-Port", sprintf3("%i", ntohs(((struct sockaddr_in *)&ssl->name)->sin_port))); |
| 147 | } else if(ssl->name.ss_family == AF_INET6) { |
| 148 | headappheader(req, "X-Ash-Address", inet_ntop(AF_INET6, &((struct sockaddr_in6 *)&ssl->name)->sin6_addr, nmbuf, sizeof(nmbuf))); |
| 149 | headappheader(req, "X-Ash-Port", sprintf3("%i", ntohs(((struct sockaddr_in6 *)&ssl->name)->sin6_port))); |
| 150 | } |
| 151 | salen = sizeof(sa); |
| 152 | if(!getsockname(ssl->fd, (struct sockaddr *)&sa, &salen)) { |
| 153 | if(sa.ss_family == AF_INET) |
| 154 | headappheader(req, "X-Ash-Server-Address", inet_ntop(AF_INET, &((struct sockaddr_in *)&sa)->sin_addr, nmbuf, sizeof(nmbuf))); |
| 155 | else if(sa.ss_family == AF_INET6) |
| 156 | headappheader(req, "X-Ash-Server-Address", inet_ntop(AF_INET6, &((struct sockaddr_in6 *)&sa)->sin6_addr, nmbuf, sizeof(nmbuf))); |
| 157 | } |
| 158 | headappheader(req, "X-Ash-Server-Port", sprintf3("%i", ssl->port->sport)); |
| 159 | headappheader(req, "X-Ash-Protocol", "https"); |
| 160 | return(0); |
| 161 | } |
| 162 | |
| 163 | static void servessl(struct muth *muth, va_list args) |
| 164 | { |
| 165 | vavar(int, fd); |
| 166 | vavar(struct sockaddr_storage, name); |
| 167 | vavar(struct sslport *, pd); |
| 168 | struct conn conn; |
| 169 | struct sslconn ssl; |
| 170 | gnutls_session_t sess; |
| 171 | int ret; |
| 172 | FILE *in; |
| 173 | |
| 174 | fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK); |
| 175 | gnutls_init(&sess, GNUTLS_SERVER); |
| 176 | gnutls_set_default_priority(sess); |
| 177 | gnutls_credentials_set(sess, GNUTLS_CRD_CERTIFICATE, pd->creds); |
| 178 | gnutls_certificate_server_set_request(sess, GNUTLS_CERT_REQUEST); |
| 179 | gnutls_transport_set_ptr(sess, (gnutls_transport_ptr_t)(intptr_t)fd); |
| 180 | while((ret = gnutls_handshake(sess)) != 0) { |
| 181 | if((ret != GNUTLS_E_INTERRUPTED) && (ret != GNUTLS_E_AGAIN)) |
| 182 | goto out; |
| 183 | if(tlsblock(fd, sess, 60) <= 0) |
| 184 | goto out; |
| 185 | } |
| 186 | memset(&conn, 0, sizeof(conn)); |
| 187 | memset(&ssl, 0, sizeof(ssl)); |
| 188 | conn.pdata = &ssl; |
| 189 | conn.initreq = initreq; |
| 190 | ssl.fd = fd; |
| 191 | ssl.port = pd; |
| 192 | ssl.name = name; |
| 193 | ssl.sess = sess; |
| 194 | bufinit(ssl.in); |
| 195 | in = fopencookie(&ssl, "r+", iofuns); |
| 196 | serve(in, &conn); |
| 197 | |
| 198 | out: |
| 199 | gnutls_deinit(sess); |
| 200 | close(fd); |
| 201 | } |
| 202 | |
| 203 | static void listenloop(struct muth *muth, va_list args) |
| 204 | { |
| 205 | vavar(struct sslport *, pd); |
| 206 | int ns; |
| 207 | struct sockaddr_storage name; |
| 208 | socklen_t namelen; |
| 209 | |
| 210 | while(1) { |
| 211 | namelen = sizeof(name); |
| 212 | block(pd->fd, EV_READ, 0); |
| 213 | ns = accept(pd->fd, (struct sockaddr *)&name, &namelen); |
| 214 | if(ns < 0) { |
| 215 | flog(LOG_ERR, "accept: %s", strerror(errno)); |
| 216 | goto out; |
| 217 | } |
| 218 | mustart(servessl, ns, name, pd); |
| 219 | } |
| 220 | |
| 221 | out: |
| 222 | close(pd->fd); |
| 223 | free(pd); |
| 224 | } |
| 225 | |
| 226 | static void init(void) |
| 227 | { |
| 228 | static int inited = 0; |
| 229 | int ret; |
| 230 | |
| 231 | if(inited) |
| 232 | return; |
| 233 | inited = 1; |
| 234 | if((ret = gnutls_global_init()) != 0) { |
| 235 | flog(LOG_ERR, "could not initialize GnuTLS: %s", gnutls_strerror(ret)); |
| 236 | exit(1); |
| 237 | } |
| 238 | if(((ret = gnutls_dh_params_init(&dhparams)) != 0) || |
| 239 | ((ret = gnutls_dh_params_generate2(dhparams, 2048)) != 0)) { |
| 240 | flog(LOG_ERR, "GnuTLS could not generate Diffie-Hellman parameters: %s", gnutls_strerror(ret)); |
| 241 | exit(1); |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | void handlegnussl(int argc, char **argp, char **argv) |
| 246 | { |
| 247 | int i, ret, port, fd; |
| 248 | gnutls_certificate_credentials_t creds; |
| 249 | struct sslport *pd; |
| 250 | char *crtfile, *keyfile; |
| 251 | |
| 252 | init(); |
| 253 | port = 443; |
| 254 | gnutls_certificate_allocate_credentials(&creds); |
| 255 | keyfile = crtfile = NULL; |
| 256 | for(i = 0; i < argc; i++) { |
| 257 | if(!strcmp(argp[i], "help")) { |
| 258 | printf("ssl handler parameters:\n"); |
| 259 | printf("\tcert=CERT-FILE [mandatory]\n"); |
| 260 | printf("\t\tThe name of the file to read the certificate from.\n"); |
| 261 | printf("\tkey=KEY-FILE [same as CERT-FILE]\n"); |
| 262 | printf("\t\tThe name of the file to read the private key from.\n"); |
| 263 | printf("\ttrust=CA-FILE [no default]\n"); |
| 264 | printf("\t\tThe name of a file to read trusted certificates from.\n"); |
| 265 | printf("\t\tMay be given multiple times.\n"); |
| 266 | printf("\tcrl=CRL-FILE [no default]\n"); |
| 267 | printf("\t\tThe name of a file to read revocation lists from.\n"); |
| 268 | printf("\t\tMay be given multiple times.\n"); |
| 269 | printf("\tport=PORT [443]\n"); |
| 270 | printf("\t\tThe TCP port to listen on.\n"); |
| 271 | printf("\n"); |
| 272 | printf("\tAll X.509 data files must be PEM-encoded.\n"); |
| 273 | exit(0); |
| 274 | } else if(!strcmp(argp[i], "cert")) { |
| 275 | crtfile = argv[i]; |
| 276 | } else if(!strcmp(argp[i], "key")) { |
| 277 | keyfile = argv[i]; |
| 278 | } else if(!strcmp(argp[i], "trust")) { |
| 279 | if((ret = gnutls_certificate_set_x509_trust_file(creds, argv[i], GNUTLS_X509_FMT_PEM)) != 0) { |
| 280 | flog(LOG_ERR, "ssl: could not load trust file `%s': %s", argv[i], gnutls_strerror(ret)); |
| 281 | exit(1); |
| 282 | } |
| 283 | } else if(!strcmp(argp[i], "crl")) { |
| 284 | if((ret = gnutls_certificate_set_x509_crl_file(creds, argv[i], GNUTLS_X509_FMT_PEM)) != 0) { |
| 285 | flog(LOG_ERR, "ssl: could not load CRL file `%s': %s", argv[i], gnutls_strerror(ret)); |
| 286 | exit(1); |
| 287 | } |
| 288 | } else if(!strcmp(argp[i], "port")) { |
| 289 | port = atoi(argv[i]); |
| 290 | } else { |
| 291 | flog(LOG_ERR, "unknown parameter `%s' to ssl handler", argp[i]); |
| 292 | exit(1); |
| 293 | } |
| 294 | } |
| 295 | if(crtfile == NULL) { |
| 296 | flog(LOG_ERR, "ssl: needs certificate file at the very least"); |
| 297 | exit(1); |
| 298 | } |
| 299 | if(keyfile == NULL) |
| 300 | keyfile = crtfile; |
| 301 | if((ret = gnutls_certificate_set_x509_key_file(creds, crtfile, keyfile, GNUTLS_X509_FMT_PEM)) != 0) { |
| 302 | flog(LOG_ERR, "ssl: could not load certificate or key: %s", gnutls_strerror(ret)); |
| 303 | exit(1); |
| 304 | } |
| 305 | gnutls_certificate_set_dh_params(creds, dhparams); |
| 306 | if((fd = listensock6(port)) < 0) { |
| 307 | flog(LOG_ERR, "could not listen on IPv6 port (port %i): %s", port, strerror(errno)); |
| 308 | exit(1); |
| 309 | } |
| 310 | omalloc(pd); |
| 311 | pd->fd = fd; |
| 312 | pd->sport = port; |
| 313 | pd->creds = creds; |
| 314 | mustart(listenloop, pd); |
| 315 | if((fd = listensock6(port)) < 0) { |
| 316 | if(errno != EADDRINUSE) { |
| 317 | flog(LOG_ERR, "could not listen on IPv6 port (port %i): %s", port, strerror(errno)); |
| 318 | exit(1); |
| 319 | } |
| 320 | } else { |
| 321 | omalloc(pd); |
| 322 | pd->fd = fd; |
| 323 | pd->sport = port; |
| 324 | pd->creds = creds; |
| 325 | mustart(listenloop, pd); |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | #endif |