ircd/sslproc.c

   1 /*
   2  *  sslproc.c: An interface to ssld
   3  *  Copyright (C) 2007 Aaron Sethman <androsyn@ratbox.org>
   4  *  Copyright (C) 2007 ircd-ratbox development team
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
  19  *  USA
  20  */
  21
  22 #include <rb_lib.h>
  23 #include "stdinc.h"
  24
  25
  26 #include "s_conf.h"
  27 #include "logger.h"
  28 #include "listener.h"
  29 #include "sslproc.h"
  30 #include "s_serv.h"
  31 #include "ircd.h"
  32 #include "hash.h"
  33 #include "client.h"
  34 #include "send.h"
  35 #include "packet.h"
  36 #include "certfp.h"
  37
  38 #define ZIPSTATS_TIME           60
  39
  40 static void collect_zipstats(void *unused);
  41 static void ssl_read_ctl(rb_fde_t * F, void *data);
  42 static int ssld_count;
  43
  44 static char tmpbuf[READBUF_SIZE];
  45 static char nul = '\0';
  46
  47 #define MAXPASSFD 4
  48 #define READSIZE 1024
  49 typedef struct _ssl_ctl_buf
  50 {
  51         rb_dlink_node node;
  52         char *buf;
  53         size_t buflen;
  54         rb_fde_t *F[MAXPASSFD];
  55         int nfds;
  56 } ssl_ctl_buf_t;
  57
  58
  59 struct _ssl_ctl
  60 {
  61         rb_dlink_node node;
  62         int cli_count;
  63         rb_fde_t *F;
  64         rb_fde_t *P;
  65         pid_t pid;
  66         rb_dlink_list readq;
  67         rb_dlink_list writeq;
  68         uint8_t shutdown;
  69         uint8_t dead;
  70         char version[256];
  71 };
  72
  73 static void ssld_update_config_one(ssl_ctl_t *ctl);
  74 static void send_new_ssl_certs_one(ssl_ctl_t * ctl);
  75 static void send_certfp_method(ssl_ctl_t *ctl);
  76
  77
  78 static rb_dlink_list ssl_daemons;
  79
  80 static inline uint32_t
  81 buf_to_uint32(char *buf)
  82 {
  83         uint32_t x;
  84         memcpy(&x, buf, sizeof(x));
  85         return x;
  86 }
  87
  88 static inline void
  89 uint32_to_buf(char *buf, uint32_t x)
  90 {
  91         memcpy(buf, &x, sizeof(x));
  92         return;
  93 }
  94
  95 static ssl_ctl_t *
  96 allocate_ssl_daemon(rb_fde_t * F, rb_fde_t * P, int pid)
  97 {
  98         ssl_ctl_t *ctl;
  99
 100         if(F == NULL || pid < 0)
 101                 return NULL;
 102         ctl = rb_malloc(sizeof(ssl_ctl_t));
 103         ctl->F = F;
 104         ctl->P = P;
 105         ctl->pid = pid;
 106         ssld_count++;
 107         rb_dlinkAdd(ctl, &ctl->node, &ssl_daemons);
 108         return ctl;
 109 }
 110
 111 static void
 112 free_ssl_daemon(ssl_ctl_t * ctl)
 113 {
 114         rb_dlink_node *ptr;
 115         ssl_ctl_buf_t *ctl_buf;
 116         int x;
 117         if(ctl->cli_count)
 118                 return;
 119
 120         RB_DLINK_FOREACH(ptr, ctl->readq.head)
 121         {
 122                 ctl_buf = ptr->data;
 123                 for(x = 0; x < ctl_buf->nfds; x++)
 124                         rb_close(ctl_buf->F[x]);
 125
 126                 rb_free(ctl_buf->buf);
 127                 rb_free(ctl_buf);
 128         }
 129
 130         RB_DLINK_FOREACH(ptr, ctl->writeq.head)
 131         {
 132                 ctl_buf = ptr->data;
 133                 for(x = 0; x < ctl_buf->nfds; x++)
 134                         rb_close(ctl_buf->F[x]);
 135
 136                 rb_free(ctl_buf->buf);
 137                 rb_free(ctl_buf);
 138         }
 139         rb_close(ctl->F);
 140         rb_close(ctl->P);
 141         rb_dlinkDelete(&ctl->node, &ssl_daemons);
 142         rb_free(ctl);
 143 }
 144
 145 static char *ssld_path;
 146
 147 static int ssld_spin_count = 0;
 148 static time_t last_spin;
 149 static int ssld_wait = 0;
 150
 151
 152 void
 153 restart_ssld(void)
 154 {
 155         rb_dlink_node *ptr, *next;
 156         ssl_ctl_t *ctl;
 157
 158         RB_DLINK_FOREACH_SAFE(ptr, next, ssl_daemons.head)
 159         {
 160                 ctl = ptr->data;
 161                 if(ctl->dead)
 162                         continue;
 163                 if(ctl->shutdown)
 164                         continue;
 165                 ctl->shutdown = 1;
 166                 ssld_count--;
 167                 if(!ctl->cli_count)
 168                 {
 169                         rb_kill(ctl->pid, SIGKILL);
 170                         free_ssl_daemon(ctl);
 171                 }
 172         }
 173
 174         start_ssldaemon(ServerInfo.ssld_count);
 175 }
 176
 177 static void
 178 ssl_killall(void)
 179 {
 180         rb_dlink_node *ptr, *next;
 181         ssl_ctl_t *ctl;
 182         RB_DLINK_FOREACH_SAFE(ptr, next, ssl_daemons.head)
 183         {
 184                 ctl = ptr->data;
 185                 if(ctl->dead)
 186                         continue;
 187                 ctl->dead = 1;
 188                 if(!ctl->shutdown)
 189                         ssld_count--;
 190                 rb_kill(ctl->pid, SIGKILL);
 191                 if(!ctl->cli_count)
 192                         free_ssl_daemon(ctl);
 193         }
 194 }
 195
 196 static void
 197 ssl_dead(ssl_ctl_t * ctl)
 198 {
 199         if(ctl->dead)
 200                 return;
 201
 202         ctl->dead = 1;
 203         rb_kill(ctl->pid, SIGKILL);     /* make sure the process is really gone */
 204
 205         if(!ctl->shutdown)
 206         {
 207                 ssld_count--;
 208                 ilog(L_MAIN, "ssld helper died - attempting to restart");
 209                 sendto_realops_snomask(SNO_GENERAL, L_ALL, "ssld helper died - attempting to restart");
 210                 start_ssldaemon(1);
 211         }
 212 }
 213
 214 static void
 215 ssl_do_pipe(rb_fde_t * F, void *data)
 216 {
 217         int retlen;
 218         ssl_ctl_t *ctl = data;
 219         retlen = rb_write(F, "0", 1);
 220         if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno)))
 221         {
 222                 ssl_dead(ctl);
 223                 return;
 224         }
 225         rb_setselect(F, RB_SELECT_READ, ssl_do_pipe, data);
 226 }
 227
 228 static void
 229 restart_ssld_event(void *unused)
 230 {
 231         ssld_spin_count = 0;
 232         last_spin = 0;
 233         ssld_wait = 0;
 234         if(ServerInfo.ssld_count > get_ssld_count())
 235         {
 236                 int start = ServerInfo.ssld_count - get_ssld_count();
 237                 ilog(L_MAIN, "Attempting to restart ssld processes");
 238                 sendto_realops_snomask(SNO_GENERAL, L_ALL, "Attempt to restart ssld processes");
 239                 start_ssldaemon(start);
 240         }
 241 }
 242
 243 int
 244 start_ssldaemon(int count)
 245 {
 246         rb_fde_t *F1, *F2;
 247         rb_fde_t *P1, *P2;
 248 #ifdef _WIN32
 249         const char *suffix = ".exe";
 250 #else
 251         const char *suffix = "";
 252 #endif
 253
 254         char fullpath[PATH_MAX + 1];
 255         char fdarg[6];
 256         const char *parv[2];
 257         char buf[128];
 258         char s_pid[10];
 259         pid_t pid;
 260         int started = 0, i;
 261
 262         if(ssld_wait)
 263                 return 0;
 264
 265         if(ssld_spin_count > 20 && (rb_current_time() - last_spin < 5))
 266         {
 267                 ilog(L_MAIN, "ssld helper is spinning - will attempt to restart in 1 minute");
 268                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 269                                        "ssld helper is spinning - will attempt to restart in 1 minute");
 270                 rb_event_add("restart_ssld_event", restart_ssld_event, NULL, 60);
 271                 ssld_wait = 1;
 272                 return 0;
 273         }
 274
 275         ssld_spin_count++;
 276         last_spin = rb_current_time();
 277
 278         if(ssld_path == NULL)
 279         {
 280                 snprintf(fullpath, sizeof(fullpath), "%s%cssld%s", ircd_paths[IRCD_PATH_LIBEXEC], RB_PATH_SEPARATOR, suffix);
 281
 282                 if(access(fullpath, X_OK) == -1)
 283                 {
 284                         snprintf(fullpath, sizeof(fullpath), "%s%cbin%cssld%s",
 285                                     ConfigFileEntry.dpath, RB_PATH_SEPARATOR, RB_PATH_SEPARATOR, suffix);
 286                         if(access(fullpath, X_OK) == -1)
 287                         {
 288                                 ilog(L_MAIN,
 289                                      "Unable to execute ssld%s in %s or %s/bin",
 290                                      suffix, ircd_paths[IRCD_PATH_LIBEXEC], ConfigFileEntry.dpath);
 291                                 return 0;
 292                         }
 293                 }
 294                 ssld_path = rb_strdup(fullpath);
 295         }
 296         rb_strlcpy(buf, "-ircd ssld daemon", sizeof(buf));
 297         parv[0] = buf;
 298         parv[1] = NULL;
 299
 300         for(i = 0; i < count; i++)
 301         {
 302                 ssl_ctl_t *ctl;
 303                 if(rb_socketpair(AF_UNIX, SOCK_DGRAM, 0, &F1, &F2, "SSL/TLS handle passing socket") == -1)
 304                 {
 305                         ilog(L_MAIN, "Unable to create ssld - rb_socketpair failed: %s", strerror(errno));
 306                         return started;
 307                 }
 308
 309                 rb_set_buffers(F1, READBUF_SIZE);
 310                 rb_set_buffers(F2, READBUF_SIZE);
 311                 snprintf(fdarg, sizeof(fdarg), "%d", rb_get_fd(F2));
 312                 rb_setenv("CTL_FD", fdarg, 1);
 313                 if(rb_pipe(&P1, &P2, "SSL/TLS pipe") == -1)
 314                 {
 315                         ilog(L_MAIN, "Unable to create ssld - rb_pipe failed: %s", strerror(errno));
 316                         return started;
 317                 }
 318                 snprintf(fdarg, sizeof(fdarg), "%d", rb_get_fd(P1));
 319                 rb_setenv("CTL_PIPE", fdarg, 1);
 320                 snprintf(s_pid, sizeof(s_pid), "%d", (int)getpid());
 321                 rb_setenv("CTL_PPID", s_pid, 1);
 322 #ifdef _WIN32
 323                 SetHandleInformation((HANDLE) rb_get_fd(F2), HANDLE_FLAG_INHERIT, 1);
 324                 SetHandleInformation((HANDLE) rb_get_fd(P1), HANDLE_FLAG_INHERIT, 1);
 325 #endif
 326
 327                 pid = rb_spawn_process(ssld_path, (const char **) parv);
 328                 if(pid == -1)
 329                 {
 330                         ilog(L_MAIN, "Unable to create ssld: %s\n", strerror(errno));
 331                         rb_close(F1);
 332                         rb_close(F2);
 333                         rb_close(P1);
 334                         rb_close(P2);
 335                         return started;
 336                 }
 337                 started++;
 338                 rb_close(F2);
 339                 rb_close(P1);
 340                 ctl = allocate_ssl_daemon(F1, P2, pid);
 341                 if(ircd_ssl_ok)
 342                         ssld_update_config_one(ctl);
 343                 ssl_read_ctl(ctl->F, ctl);
 344                 ssl_do_pipe(P2, ctl);
 345
 346         }
 347         return started;
 348 }
 349
 350 static void
 351 ssl_process_zipstats(ssl_ctl_t * ctl, ssl_ctl_buf_t * ctl_buf)
 352 {
 353         struct Client *server;
 354         struct ZipStats *zips;
 355         char *parv[7];
 356         (void) rb_string_to_array(ctl_buf->buf, parv, 6);
 357         server = find_server(NULL, parv[1]);
 358         if(server == NULL || server->localClient == NULL || !IsCapable(server, CAP_ZIP))
 359                 return;
 360         if(server->localClient->zipstats == NULL)
 361                 server->localClient->zipstats = rb_malloc(sizeof(struct ZipStats));
 362
 363         zips = server->localClient->zipstats;
 364
 365         zips->in += strtoull(parv[2], NULL, 10);
 366         zips->in_wire += strtoull(parv[3], NULL, 10);
 367         zips->out += strtoull(parv[4], NULL, 10);
 368         zips->out_wire += strtoull(parv[5], NULL, 10);
 369
 370         if(zips->in > 0)
 371                 zips->in_ratio = ((double) (zips->in - zips->in_wire) / (double) zips->in) * 100.00;
 372         else
 373                 zips->in_ratio = 0;
 374
 375         if(zips->out > 0)
 376                 zips->out_ratio = ((double) (zips->out - zips->out_wire) / (double) zips->out) * 100.00;
 377         else
 378                 zips->out_ratio = 0;
 379 }
 380
 381 static void
 382 ssl_process_open_fd(ssl_ctl_t * ctl, ssl_ctl_buf_t * ctl_buf)
 383 {
 384         struct Client *client_p;
 385         uint32_t fd;
 386
 387         if(ctl_buf->buflen < 5)
 388                 return; /* bogus message..drop it.. XXX should warn here */
 389
 390         fd = buf_to_uint32(&ctl_buf->buf[1]);
 391         client_p = find_cli_connid_hash(fd);
 392         if(client_p == NULL || client_p->localClient == NULL)
 393                 return;
 394
 395         if(client_p->localClient->ssl_callback)
 396         {
 397                 SSL_OPEN_CB *hdl = client_p->localClient->ssl_callback;
 398
 399                 client_p->localClient->ssl_callback = NULL;
 400
 401                 hdl(client_p, RB_OK);
 402         }
 403 }
 404
 405 static void
 406 ssl_process_dead_fd(ssl_ctl_t * ctl, ssl_ctl_buf_t * ctl_buf)
 407 {
 408         struct Client *client_p;
 409         char reason[256];
 410         uint32_t fd;
 411
 412         if(ctl_buf->buflen < 6)
 413                 return;         /* bogus message..drop it.. XXX should warn here */
 414
 415         fd = buf_to_uint32(&ctl_buf->buf[1]);
 416         rb_strlcpy(reason, &ctl_buf->buf[5], sizeof(reason));
 417         client_p = find_cli_connid_hash(fd);
 418         if(client_p == NULL || client_p->localClient == NULL)
 419                 return;
 420
 421         if(IsAnyServer(client_p))
 422         {
 423                 sendto_realops_snomask(SNO_GENERAL, is_remote_connect(client_p) && !IsServer(client_p) ? L_NETWIDE : L_ALL, "ssld error for %s: %s", client_p->name, reason);
 424                 ilog(L_SERVER, "ssld error for %s: %s", log_client_name(client_p, SHOW_IP), reason);
 425         }
 426
 427         /* if there is still a pending callback, call it now */
 428         if(client_p->localClient->ssl_callback)
 429         {
 430                 SSL_OPEN_CB *hdl = client_p->localClient->ssl_callback;
 431
 432                 client_p->localClient->ssl_callback = NULL;
 433
 434                 if (hdl(client_p, RB_ERROR_SSL))
 435                 {
 436                         /* the callback has exited the client */
 437                         return;
 438                 }
 439         }
 440
 441         if(IsAnyServer(client_p) || IsRegistered(client_p))
 442         {
 443                 /* read any last moment ERROR, QUIT or the like -- jilles */
 444                 if (!strcmp(reason, "Remote host closed the connection"))
 445                         read_packet(client_p->localClient->F, client_p);
 446                 if (IsAnyDead(client_p))
 447                         return;
 448         }
 449         exit_client(client_p, client_p, &me, reason);
 450 }
 451
 452
 453 static void
 454 ssl_process_cipher_string(ssl_ctl_t *ctl, ssl_ctl_buf_t *ctl_buf)
 455 {
 456         struct Client *client_p;
 457         const char *cstring;
 458         uint32_t fd;
 459
 460         if(ctl_buf->buflen < 6)
 461                 return;         /* bogus message..drop it.. XXX should warn here */
 462
 463         fd = buf_to_uint32(&ctl_buf->buf[1]);
 464         cstring = (const char *)&ctl_buf->buf[5];
 465
 466         if(EmptyString(cstring))
 467                 return;
 468
 469         client_p = find_cli_connid_hash(fd);
 470         if(client_p != NULL && client_p->localClient != NULL)
 471         {
 472                 rb_free(client_p->localClient->cipher_string);
 473                 client_p->localClient->cipher_string = rb_strdup(cstring);
 474         }
 475 }
 476
 477
 478 static void
 479 ssl_process_certfp(ssl_ctl_t * ctl, ssl_ctl_buf_t * ctl_buf)
 480 {
 481         struct Client *client_p;
 482         uint32_t fd;
 483         uint32_t certfp_method;
 484         uint32_t len;
 485         uint8_t *certfp;
 486         char *certfp_string;
 487         const char *method_string;
 488         int method_len;
 489
 490         if(ctl_buf->buflen > 13 + RB_SSL_CERTFP_LEN)
 491                 return;         /* bogus message..drop it.. XXX should warn here */
 492
 493         fd = buf_to_uint32(&ctl_buf->buf[1]);
 494         certfp_method = buf_to_uint32(&ctl_buf->buf[5]);
 495         len = buf_to_uint32(&ctl_buf->buf[9]);
 496         certfp = (uint8_t *)&ctl_buf->buf[13];
 497         client_p = find_cli_connid_hash(fd);
 498         if(client_p == NULL)
 499                 return;
 500
 501         switch (certfp_method) {
 502         case RB_SSL_CERTFP_METH_CERT_SHA1:
 503                 method_string = CERTFP_PREFIX_CERT_SHA1;
 504                 break;
 505         case RB_SSL_CERTFP_METH_CERT_SHA256:
 506                 method_string = CERTFP_PREFIX_CERT_SHA256;
 507                 break;
 508         case RB_SSL_CERTFP_METH_CERT_SHA512:
 509                 method_string = CERTFP_PREFIX_CERT_SHA512;
 510                 break;
 511         case RB_SSL_CERTFP_METH_SPKI_SHA256:
 512                 method_string = CERTFP_PREFIX_SPKI_SHA256;
 513                 break;
 514         case RB_SSL_CERTFP_METH_SPKI_SHA512:
 515                 method_string = CERTFP_PREFIX_SPKI_SHA512;
 516                 break;
 517         default:
 518                 return;
 519         }
 520         method_len = strlen(method_string);
 521
 522         rb_free(client_p->certfp);
 523         certfp_string = rb_malloc(method_len + len * 2 + 1);
 524         strcpy(certfp_string, method_string);
 525         for(uint32_t i = 0; i < len; i++)
 526                 snprintf(certfp_string + method_len + 2 * i, 3, "%02x",
 527                                 certfp[i]);
 528         client_p->certfp = certfp_string;
 529 }
 530
 531 static void
 532 ssl_process_cmd_recv(ssl_ctl_t * ctl)
 533 {
 534         static const char *cannot_setup_ssl = "ssld cannot setup ssl, check your certificates and private key";
 535         static const char *no_ssl_or_zlib = "ssld has neither SSL/TLS or zlib support killing all sslds";
 536         rb_dlink_node *ptr, *next;
 537         ssl_ctl_buf_t *ctl_buf;
 538         unsigned long len;
 539
 540         if(ctl->dead)
 541                 return;
 542
 543         RB_DLINK_FOREACH_SAFE(ptr, next, ctl->readq.head)
 544         {
 545                 ctl_buf = ptr->data;
 546                 switch (*ctl_buf->buf)
 547                 {
 548                 case 'N':
 549                         ircd_ssl_ok = false;    /* ssld says it can't do ssl/tls */
 550                         break;
 551                 case 'O':
 552                         ssl_process_open_fd(ctl, ctl_buf);
 553                         break;
 554                 case 'D':
 555                         ssl_process_dead_fd(ctl, ctl_buf);
 556                         break;
 557                 case 'C':
 558                         ssl_process_cipher_string(ctl, ctl_buf);
 559                         break;
 560                 case 'F':
 561                         ssl_process_certfp(ctl, ctl_buf);
 562                         break;
 563                 case 'S':
 564                         ssl_process_zipstats(ctl, ctl_buf);
 565                         break;
 566                 case 'I':
 567                         ircd_ssl_ok = false;
 568                         ilog(L_MAIN, "%s", cannot_setup_ssl);
 569                         sendto_realops_snomask(SNO_GENERAL, L_ALL, "%s", cannot_setup_ssl);
 570                         break;
 571                 case 'U':
 572                         ircd_zlib_ok = 0;
 573                         ircd_ssl_ok = false;
 574                         ilog(L_MAIN, "%s", no_ssl_or_zlib);
 575                         sendto_realops_snomask(SNO_GENERAL, L_ALL, "%s", no_ssl_or_zlib);
 576                         ssl_killall();
 577                         return;
 578                 case 'V':
 579                         len = ctl_buf->buflen - 1;
 580                         if (len > sizeof(ctl->version) - 1)
 581                                 len = sizeof(ctl->version) - 1;
 582                         strncpy(ctl->version, &ctl_buf->buf[1], len);
 583                 case 'z':
 584                         ircd_zlib_ok = 0;
 585                         break;
 586                 default:
 587                         ilog(L_MAIN, "Received invalid command from ssld: %s", ctl_buf->buf);
 588                         sendto_realops_snomask(SNO_GENERAL, L_ALL, "Received invalid command from ssld");
 589                         break;
 590                 }
 591                 rb_dlinkDelete(ptr, &ctl->readq);
 592                 rb_free(ctl_buf->buf);
 593                 rb_free(ctl_buf);
 594         }
 595
 596 }
 597
 598
 599 static void
 600 ssl_read_ctl(rb_fde_t * F, void *data)
 601 {
 602         ssl_ctl_buf_t *ctl_buf;
 603         ssl_ctl_t *ctl = data;
 604         int retlen;
 605
 606         if(ctl->dead)
 607                 return;
 608         do
 609         {
 610                 ctl_buf = rb_malloc(sizeof(ssl_ctl_buf_t));
 611                 ctl_buf->buf = rb_malloc(READSIZE);
 612                 retlen = rb_recv_fd_buf(ctl->F, ctl_buf->buf, READSIZE, ctl_buf->F, 4);
 613                 ctl_buf->buflen = retlen;
 614                 if(retlen <= 0)
 615                 {
 616                         rb_free(ctl_buf->buf);
 617                         rb_free(ctl_buf);
 618                 }
 619                 else
 620                         rb_dlinkAddTail(ctl_buf, &ctl_buf->node, &ctl->readq);
 621         }
 622         while(retlen > 0);
 623
 624         if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno)))
 625         {
 626                 ssl_dead(ctl);
 627                 return;
 628         }
 629         ssl_process_cmd_recv(ctl);
 630         rb_setselect(ctl->F, RB_SELECT_READ, ssl_read_ctl, ctl);
 631 }
 632
 633 static ssl_ctl_t *
 634 which_ssld(void)
 635 {
 636         ssl_ctl_t *ctl, *lowest = NULL;
 637         rb_dlink_node *ptr;
 638
 639         RB_DLINK_FOREACH(ptr, ssl_daemons.head)
 640         {
 641                 ctl = ptr->data;
 642                 if(ctl->dead)
 643                         continue;
 644                 if(ctl->shutdown)
 645                         continue;
 646                 if(lowest == NULL)
 647                 {
 648                         lowest = ctl;
 649                         continue;
 650                 }
 651                 if(ctl->cli_count < lowest->cli_count)
 652                         lowest = ctl;
 653         }
 654         return (lowest);
 655 }
 656
 657 static void
 658 ssl_write_ctl(rb_fde_t * F, void *data)
 659 {
 660         ssl_ctl_t *ctl = data;
 661         ssl_ctl_buf_t *ctl_buf;
 662         rb_dlink_node *ptr, *next;
 663         int retlen, x;
 664
 665         if(ctl->dead)
 666                 return;
 667
 668         RB_DLINK_FOREACH_SAFE(ptr, next, ctl->writeq.head)
 669         {
 670                 ctl_buf = ptr->data;
 671                 /* in theory unix sock_dgram shouldn't ever short write this.. */
 672                 retlen = rb_send_fd_buf(ctl->F, ctl_buf->F, ctl_buf->nfds, ctl_buf->buf, ctl_buf->buflen, ctl->pid);
 673                 if(retlen > 0)
 674                 {
 675                         rb_dlinkDelete(ptr, &ctl->writeq);
 676                         for(x = 0; x < ctl_buf->nfds; x++)
 677                                 rb_close(ctl_buf->F[x]);
 678                         rb_free(ctl_buf->buf);
 679                         rb_free(ctl_buf);
 680
 681                 }
 682                 if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno)))
 683                 {
 684                         ssl_dead(ctl);
 685                         return;
 686                 }
 687                 else
 688                 {
 689                         rb_setselect(ctl->F, RB_SELECT_WRITE, ssl_write_ctl, ctl);
 690                 }
 691         }
 692 }
 693
 694 static void
 695 ssl_cmd_write_queue(ssl_ctl_t * ctl, rb_fde_t ** F, int count, const void *buf, size_t buflen)
 696 {
 697         ssl_ctl_buf_t *ctl_buf;
 698         int x;
 699
 700         /* don't bother */
 701         if(ctl->dead)
 702                 return;
 703
 704         ctl_buf = rb_malloc(sizeof(ssl_ctl_buf_t));
 705         ctl_buf->buf = rb_malloc(buflen);
 706         memcpy(ctl_buf->buf, buf, buflen);
 707         ctl_buf->buflen = buflen;
 708
 709         for(x = 0; x < count && x < MAXPASSFD; x++)
 710         {
 711                 ctl_buf->F[x] = F[x];
 712         }
 713         ctl_buf->nfds = count;
 714         rb_dlinkAddTail(ctl_buf, &ctl_buf->node, &ctl->writeq);
 715         ssl_write_ctl(ctl->F, ctl);
 716 }
 717
 718
 719 static void
 720 send_new_ssl_certs_one(ssl_ctl_t * ctl)
 721 {
 722         size_t len;
 723
 724         len = strlen(ServerInfo.ssl_cert) + strlen(ServerInfo.ssl_private_key) + 5;
 725         if(ServerInfo.ssl_dh_params)
 726                 len += strlen(ServerInfo.ssl_dh_params);
 727         if(ServerInfo.ssl_cipher_list)
 728                 len += strlen(ServerInfo.ssl_cipher_list);
 729         if(len > sizeof(tmpbuf))
 730         {
 731                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 732                                        "Parameters for send_new_ssl_certs_one too long (%zu > %zu) to pass to ssld, not sending...",
 733                                        len, sizeof(tmpbuf));
 734                 ilog(L_MAIN,
 735                      "Parameters for send_new_ssl_certs_one too long (%zu > %zu) to pass to ssld, not sending...",
 736                      len, sizeof(tmpbuf));
 737                 return;
 738         }
 739         len = snprintf(tmpbuf, sizeof(tmpbuf), "K%c%s%c%s%c%s%c%s%c", nul,
 740                         ServerInfo.ssl_cert, nul,
 741                         ServerInfo.ssl_private_key, nul,
 742                         ServerInfo.ssl_dh_params != NULL ? ServerInfo.ssl_dh_params : "", nul,
 743                         ServerInfo.ssl_cipher_list != NULL ? ServerInfo.ssl_cipher_list : "", nul);
 744         ssl_cmd_write_queue(ctl, NULL, 0, tmpbuf, len);
 745 }
 746
 747 static void
 748 send_certfp_method(ssl_ctl_t *ctl)
 749 {
 750         char buf[5];
 751
 752         buf[0] = 'F';
 753         uint32_to_buf(&buf[1], ConfigFileEntry.certfp_method);
 754         ssl_cmd_write_queue(ctl, NULL, 0, buf, sizeof(buf));
 755 }
 756
 757 static void
 758 ssld_update_config_one(ssl_ctl_t *ctl)
 759 {
 760         send_certfp_method(ctl);
 761         send_new_ssl_certs_one(ctl);
 762 }
 763
 764 void
 765 ssld_update_config(void)
 766 {
 767         rb_dlink_node *ptr;
 768
 769         RB_DLINK_FOREACH(ptr, ssl_daemons.head)
 770         {
 771                 ssl_ctl_t *ctl = ptr->data;
 772                 ssld_update_config_one(ctl);
 773         }
 774 }
 775
 776 ssl_ctl_t *
 777 start_ssld_accept(rb_fde_t * sslF, rb_fde_t * plainF, uint32_t id)
 778 {
 779         rb_fde_t *F[2];
 780         ssl_ctl_t *ctl;
 781         char buf[5];
 782         F[0] = sslF;
 783         F[1] = plainF;
 784
 785         buf[0] = 'A';
 786         uint32_to_buf(&buf[1], id);
 787         ctl = which_ssld();
 788         if(!ctl)
 789                 return NULL;
 790         ctl->cli_count++;
 791         ssl_cmd_write_queue(ctl, F, 2, buf, sizeof(buf));
 792         return ctl;
 793 }
 794
 795 ssl_ctl_t *
 796 start_ssld_connect(rb_fde_t * sslF, rb_fde_t * plainF, uint32_t id)
 797 {
 798         rb_fde_t *F[2];
 799         ssl_ctl_t *ctl;
 800         char buf[5];
 801         F[0] = sslF;
 802         F[1] = plainF;
 803
 804         buf[0] = 'C';
 805         uint32_to_buf(&buf[1], id);
 806
 807         ctl = which_ssld();
 808         if(!ctl)
 809                 return NULL;
 810         ctl->cli_count++;
 811         ssl_cmd_write_queue(ctl, F, 2, buf, sizeof(buf));
 812         return ctl;
 813 }
 814
 815 void
 816 ssld_decrement_clicount(ssl_ctl_t * ctl)
 817 {
 818         if(ctl == NULL)
 819                 return;
 820
 821         ctl->cli_count--;
 822         if(ctl->shutdown && !ctl->cli_count)
 823         {
 824                 ctl->dead = 1;
 825                 rb_kill(ctl->pid, SIGKILL);
 826         }
 827         if(ctl->dead && !ctl->cli_count)
 828         {
 829                 free_ssl_daemon(ctl);
 830         }
 831 }
 832
 833 /*
 834  * what we end up sending to the ssld process for ziplinks is the following
 835  * Z[ourfd][level][RECVQ]
 836  * Z = ziplinks command = buf[0]
 837  * ourfd = Our end of the socketpair = buf[1..4]
 838  * level = zip level buf[5]
 839  * recvqlen = our recvq len = buf[6-7]
 840  * recvq = any data we read prior to starting ziplinks
 841  */
 842 void
 843 start_zlib_session(void *data)
 844 {
 845         struct Client *server = (struct Client *) data;
 846         uint16_t recvqlen;
 847         uint8_t level;
 848         void *xbuf;
 849
 850         rb_fde_t *F[2];
 851         rb_fde_t *xF1, *xF2;
 852         char *buf;
 853         void *recvq_start;
 854
 855         size_t hdr = (sizeof(uint8_t) * 2) + sizeof(uint32_t);
 856         size_t len;
 857         int cpylen, left;
 858
 859         server->localClient->event = NULL;
 860
 861         recvqlen = rb_linebuf_len(&server->localClient->buf_recvq);
 862
 863         len = recvqlen + hdr;
 864
 865         if(len > READBUF_SIZE)
 866         {
 867                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 868                                        "ssld - attempted to pass message of %zd len, max len %d, giving up",
 869                                        len, READBUF_SIZE);
 870                 ilog(L_MAIN, "ssld - attempted to pass message of %zd len, max len %d, giving up", len, READBUF_SIZE);
 871                 exit_client(server, server, server, "ssld readbuf exceeded");
 872                 return;
 873         }
 874
 875         buf = rb_malloc(len);
 876         level = ConfigFileEntry.compression_level;
 877
 878         uint32_to_buf(&buf[1], rb_get_fd(server->localClient->F));
 879         buf[5] = (char) level;
 880
 881         recvq_start = &buf[6];
 882         server->localClient->zipstats = rb_malloc(sizeof(struct ZipStats));
 883
 884         xbuf = recvq_start;
 885         left = recvqlen;
 886
 887         do
 888         {
 889                 cpylen = rb_linebuf_get(&server->localClient->buf_recvq, xbuf, left, LINEBUF_PARTIAL, LINEBUF_RAW);
 890                 left -= cpylen;
 891                 xbuf = (void *) (((uintptr_t) xbuf) + cpylen);
 892         }
 893         while(cpylen > 0);
 894
 895         /* Pass the socket to ssld. */
 896         *buf = 'Z';
 897         if(rb_socketpair(AF_UNIX, SOCK_STREAM, 0, &xF1, &xF2, "Initial zlib socketpairs") == -1)
 898         {
 899                 sendto_realops_snomask(SNO_GENERAL, L_ALL, "Error creating zlib socketpair - %s", strerror(errno));
 900                 ilog(L_MAIN, "Error creating zlib socketpairs - %s", strerror(errno));
 901                 exit_client(server, server, server, "Error creating zlib socketpair");
 902                 rb_free(buf);
 903                 return;
 904         }
 905
 906         F[0] = server->localClient->F;
 907         F[1] = xF1;
 908         server->localClient->F = xF2;
 909         /* need to redo as what we did before isn't valid now */
 910         uint32_to_buf(&buf[1], connid_get(server));
 911
 912         server->localClient->z_ctl = which_ssld();
 913         if(!server->localClient->z_ctl)
 914         {
 915                 exit_client(server, server, server, "Error finding available ssld");
 916                 rb_free(buf);
 917                 return;
 918         }
 919         server->localClient->z_ctl->cli_count++;
 920         ssl_cmd_write_queue(server->localClient->z_ctl, F, 2, buf, len);
 921         rb_free(buf);
 922 }
 923
 924 static void
 925 collect_zipstats(void *unused)
 926 {
 927         rb_dlink_node *ptr;
 928         struct Client *target_p;
 929         char buf[sizeof(uint8_t) + sizeof(uint32_t) + HOSTLEN];
 930         void *odata;
 931         size_t len;
 932         uint32_t id;
 933
 934         buf[0] = 'S';
 935         odata = buf + sizeof(uint8_t) + sizeof(uint32_t);
 936
 937         RB_DLINK_FOREACH(ptr, serv_list.head)
 938         {
 939                 target_p = ptr->data;
 940                 if(IsCapable(target_p, CAP_ZIP))
 941                 {
 942                         len = sizeof(uint8_t) + sizeof(uint32_t);
 943
 944                         id = rb_get_fd(target_p->localClient->F);
 945                         uint32_to_buf(&buf[1], id);
 946                         rb_strlcpy(odata, target_p->name, (sizeof(buf) - len));
 947                         len += strlen(odata) + 1;       /* Get the \0 as well */
 948                         ssl_cmd_write_queue(target_p->localClient->z_ctl, NULL, 0, buf, len);
 949                 }
 950         }
 951 }
 952
 953 static void
 954 cleanup_dead_ssl(void *unused)
 955 {
 956         rb_dlink_node *ptr, *next;
 957         ssl_ctl_t *ctl;
 958         RB_DLINK_FOREACH_SAFE(ptr, next, ssl_daemons.head)
 959         {
 960                 ctl = ptr->data;
 961                 if(ctl->dead && !ctl->cli_count)
 962                 {
 963                         free_ssl_daemon(ctl);
 964                 }
 965         }
 966 }
 967
 968 int
 969 get_ssld_count(void)
 970 {
 971         return ssld_count;
 972 }
 973
 974 void
 975 ssld_foreach_info(void (*func)(void *data, pid_t pid, int cli_count, enum ssld_status status, const char *version), void *data)
 976 {
 977         rb_dlink_node *ptr, *next;
 978         ssl_ctl_t *ctl;
 979         RB_DLINK_FOREACH_SAFE(ptr, next, ssl_daemons.head)
 980         {
 981                 ctl = ptr->data;
 982                 func(data, ctl->pid, ctl->cli_count,
 983                         ctl->dead ? SSLD_DEAD :
 984                                 (ctl->shutdown ? SSLD_SHUTDOWN : SSLD_ACTIVE),
 985                         ctl->version);
 986         }
 987 }
 988
 989 void
 990 init_ssld(void)
 991 {
 992         rb_event_addish("collect_zipstats", collect_zipstats, NULL, ZIPSTATS_TIME);
 993         rb_event_addish("cleanup_dead_ssld", cleanup_dead_ssl, NULL, 60);
 994 }