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         ssld_spin_count = 0;
 175         last_spin = 0;
 176         ssld_wait = 0;
 177         start_ssldaemon(ServerInfo.ssld_count);
 178 }
 179
 180 static void
 181 ssl_killall(void)
 182 {
 183         rb_dlink_node *ptr, *next;
 184         ssl_ctl_t *ctl;
 185         RB_DLINK_FOREACH_SAFE(ptr, next, ssl_daemons.head)
 186         {
 187                 ctl = ptr->data;
 188                 if(ctl->dead)
 189                         continue;
 190                 ctl->dead = 1;
 191                 if(!ctl->shutdown)
 192                         ssld_count--;
 193                 rb_kill(ctl->pid, SIGKILL);
 194                 if(!ctl->cli_count)
 195                         free_ssl_daemon(ctl);
 196         }
 197 }
 198
 199 static void
 200 ssl_dead(ssl_ctl_t * ctl)
 201 {
 202         if(ctl->dead)
 203                 return;
 204
 205         ctl->dead = 1;
 206         rb_kill(ctl->pid, SIGKILL);     /* make sure the process is really gone */
 207
 208         if(!ctl->shutdown)
 209         {
 210                 ssld_count--;
 211                 ilog(L_MAIN, "ssld helper died - attempting to restart");
 212                 sendto_realops_snomask(SNO_GENERAL, L_ALL, "ssld helper died - attempting to restart");
 213                 start_ssldaemon(1);
 214         }
 215 }
 216
 217 static void
 218 ssl_do_pipe(rb_fde_t * F, void *data)
 219 {
 220         int retlen;
 221         ssl_ctl_t *ctl = data;
 222         retlen = rb_write(F, "0", 1);
 223         if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno)))
 224         {
 225                 ssl_dead(ctl);
 226                 return;
 227         }
 228         rb_setselect(F, RB_SELECT_READ, ssl_do_pipe, data);
 229 }
 230
 231 static void
 232 restart_ssld_event(void *unused)
 233 {
 234         ssld_spin_count = 0;
 235         last_spin = 0;
 236         ssld_wait = 0;
 237         if(ServerInfo.ssld_count > get_ssld_count())
 238         {
 239                 int start = ServerInfo.ssld_count - get_ssld_count();
 240                 ilog(L_MAIN, "Attempting to restart ssld processes");
 241                 sendto_realops_snomask(SNO_GENERAL, L_ALL, "Attempt to restart ssld processes");
 242                 start_ssldaemon(start);
 243         }
 244 }
 245
 246 int
 247 start_ssldaemon(int count)
 248 {
 249         rb_fde_t *F1, *F2;
 250         rb_fde_t *P1, *P2;
 251 #ifdef _WIN32
 252         const char *suffix = ".exe";
 253 #else
 254         const char *suffix = "";
 255 #endif
 256
 257         char fullpath[PATH_MAX + 1];
 258         char fdarg[6];
 259         const char *parv[2];
 260         char buf[128];
 261         char s_pid[10];
 262         pid_t pid;
 263         int started = 0, i;
 264
 265         if(ssld_wait)
 266                 return 0;
 267
 268         if(ssld_spin_count > 20 && (rb_current_time() - last_spin < 5))
 269         {
 270                 ilog(L_MAIN, "ssld helper is spinning - will attempt to restart in 1 minute");
 271                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 272                                        "ssld helper is spinning - will attempt to restart in 1 minute");
 273                 rb_event_add("restart_ssld_event", restart_ssld_event, NULL, 60);
 274                 ssld_wait = 1;
 275                 return 0;
 276         }
 277
 278         ssld_spin_count++;
 279         last_spin = rb_current_time();
 280
 281         if(ssld_path == NULL)
 282         {
 283                 snprintf(fullpath, sizeof(fullpath), "%s%cssld%s", ircd_paths[IRCD_PATH_LIBEXEC], RB_PATH_SEPARATOR, suffix);
 284
 285                 if(access(fullpath, X_OK) == -1)
 286                 {
 287                         snprintf(fullpath, sizeof(fullpath), "%s%cbin%cssld%s",
 288                                     ConfigFileEntry.dpath, RB_PATH_SEPARATOR, RB_PATH_SEPARATOR, suffix);
 289                         if(access(fullpath, X_OK) == -1)
 290                         {
 291                                 ilog(L_MAIN,
 292                                      "Unable to execute ssld%s in %s or %s/bin",
 293                                      suffix, ircd_paths[IRCD_PATH_LIBEXEC], ConfigFileEntry.dpath);
 294                                 return 0;
 295                         }
 296                 }
 297                 ssld_path = rb_strdup(fullpath);
 298         }
 299         rb_strlcpy(buf, "-ircd ssld daemon", sizeof(buf));
 300         parv[0] = buf;
 301         parv[1] = NULL;
 302
 303         for(i = 0; i < count; i++)
 304         {
 305                 ssl_ctl_t *ctl;
 306                 if(rb_socketpair(AF_UNIX, SOCK_DGRAM, 0, &F1, &F2, "SSL/TLS handle passing socket") == -1)
 307                 {
 308                         ilog(L_MAIN, "Unable to create ssld - rb_socketpair failed: %s", strerror(errno));
 309                         return started;
 310                 }
 311
 312                 rb_set_buffers(F1, READBUF_SIZE);
 313                 rb_set_buffers(F2, READBUF_SIZE);
 314                 snprintf(fdarg, sizeof(fdarg), "%d", rb_get_fd(F2));
 315                 rb_setenv("CTL_FD", fdarg, 1);
 316                 if(rb_pipe(&P1, &P2, "SSL/TLS pipe") == -1)
 317                 {
 318                         ilog(L_MAIN, "Unable to create ssld - rb_pipe failed: %s", strerror(errno));
 319                         return started;
 320                 }
 321                 snprintf(fdarg, sizeof(fdarg), "%d", rb_get_fd(P1));
 322                 rb_setenv("CTL_PIPE", fdarg, 1);
 323                 snprintf(s_pid, sizeof(s_pid), "%d", (int)getpid());
 324                 rb_setenv("CTL_PPID", s_pid, 1);
 325 #ifdef _WIN32
 326                 SetHandleInformation((HANDLE) rb_get_fd(F2), HANDLE_FLAG_INHERIT, 1);
 327                 SetHandleInformation((HANDLE) rb_get_fd(P1), HANDLE_FLAG_INHERIT, 1);
 328 #endif
 329
 330                 pid = rb_spawn_process(ssld_path, (const char **) parv);
 331                 if(pid == -1)
 332                 {
 333                         ilog(L_MAIN, "Unable to create ssld: %s\n", strerror(errno));
 334                         rb_close(F1);
 335                         rb_close(F2);
 336                         rb_close(P1);
 337                         rb_close(P2);
 338                         return started;
 339                 }
 340                 started++;
 341                 rb_close(F2);
 342                 rb_close(P1);
 343                 ctl = allocate_ssl_daemon(F1, P2, pid);
 344                 if(ircd_ssl_ok)
 345                         ssld_update_config_one(ctl);
 346                 ssl_read_ctl(ctl->F, ctl);
 347                 ssl_do_pipe(P2, ctl);
 348
 349         }
 350         return started;
 351 }
 352
 353 static void
 354 ssl_process_zipstats(ssl_ctl_t * ctl, ssl_ctl_buf_t * ctl_buf)
 355 {
 356         struct Client *server;
 357         struct ZipStats *zips;
 358         char *parv[7];
 359         (void) rb_string_to_array(ctl_buf->buf, parv, 6);
 360         server = find_server(NULL, parv[1]);
 361         if(server == NULL || server->localClient == NULL || !IsCapable(server, CAP_ZIP))
 362                 return;
 363         if(server->localClient->zipstats == NULL)
 364                 server->localClient->zipstats = rb_malloc(sizeof(struct ZipStats));
 365
 366         zips = server->localClient->zipstats;
 367
 368         zips->in += strtoull(parv[2], NULL, 10);
 369         zips->in_wire += strtoull(parv[3], NULL, 10);
 370         zips->out += strtoull(parv[4], NULL, 10);
 371         zips->out_wire += strtoull(parv[5], NULL, 10);
 372
 373         if(zips->in > 0)
 374                 zips->in_ratio = ((double) (zips->in - zips->in_wire) / (double) zips->in) * 100.00;
 375         else
 376                 zips->in_ratio = 0;
 377
 378         if(zips->out > 0)
 379                 zips->out_ratio = ((double) (zips->out - zips->out_wire) / (double) zips->out) * 100.00;
 380         else
 381                 zips->out_ratio = 0;
 382 }
 383
 384 static void
 385 ssl_process_open_fd(ssl_ctl_t * ctl, ssl_ctl_buf_t * ctl_buf)
 386 {
 387         struct Client *client_p;
 388         uint32_t fd;
 389
 390         if(ctl_buf->buflen < 5)
 391                 return; /* bogus message..drop it.. XXX should warn here */
 392
 393         fd = buf_to_uint32(&ctl_buf->buf[1]);
 394         client_p = find_cli_connid_hash(fd);
 395         if(client_p == NULL || client_p->localClient == NULL)
 396                 return;
 397
 398         if(client_p->localClient->ssl_callback)
 399         {
 400                 SSL_OPEN_CB *hdl = client_p->localClient->ssl_callback;
 401
 402                 client_p->localClient->ssl_callback = NULL;
 403
 404                 hdl(client_p, RB_OK);
 405         }
 406 }
 407
 408 static void
 409 ssl_process_dead_fd(ssl_ctl_t * ctl, ssl_ctl_buf_t * ctl_buf)
 410 {
 411         struct Client *client_p;
 412         char reason[256];
 413         uint32_t fd;
 414
 415         if(ctl_buf->buflen < 6)
 416                 return;         /* bogus message..drop it.. XXX should warn here */
 417
 418         fd = buf_to_uint32(&ctl_buf->buf[1]);
 419         rb_strlcpy(reason, &ctl_buf->buf[5], sizeof(reason));
 420         client_p = find_cli_connid_hash(fd);
 421         if(client_p == NULL || client_p->localClient == NULL)
 422                 return;
 423
 424         if(IsAnyServer(client_p))
 425         {
 426                 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);
 427                 ilog(L_SERVER, "ssld error for %s: %s", log_client_name(client_p, SHOW_IP), reason);
 428         }
 429
 430         /* if there is still a pending callback, call it now */
 431         if(client_p->localClient->ssl_callback)
 432         {
 433                 SSL_OPEN_CB *hdl = client_p->localClient->ssl_callback;
 434
 435                 client_p->localClient->ssl_callback = NULL;
 436
 437                 if (hdl(client_p, RB_ERROR_SSL))
 438                 {
 439                         /* the callback has exited the client */
 440                         return;
 441                 }
 442         }
 443
 444         if(IsAnyServer(client_p) || IsRegistered(client_p))
 445         {
 446                 /* read any last moment ERROR, QUIT or the like -- jilles */
 447                 if (!strcmp(reason, "Remote host closed the connection"))
 448                         read_packet(client_p->localClient->F, client_p);
 449                 if (IsAnyDead(client_p))
 450                         return;
 451         }
 452         exit_client(client_p, client_p, &me, reason);
 453 }
 454
 455
 456 static void
 457 ssl_process_cipher_string(ssl_ctl_t *ctl, ssl_ctl_buf_t *ctl_buf)
 458 {
 459         struct Client *client_p;
 460         const char *cstring;
 461         uint32_t fd;
 462
 463         if(ctl_buf->buflen < 6)
 464                 return;         /* bogus message..drop it.. XXX should warn here */
 465
 466         fd = buf_to_uint32(&ctl_buf->buf[1]);
 467         cstring = (const char *)&ctl_buf->buf[5];
 468
 469         if(EmptyString(cstring))
 470                 return;
 471
 472         client_p = find_cli_connid_hash(fd);
 473         if(client_p != NULL && client_p->localClient != NULL)
 474         {
 475                 rb_free(client_p->localClient->cipher_string);
 476                 client_p->localClient->cipher_string = rb_strdup(cstring);
 477         }
 478 }
 479
 480
 481 static void
 482 ssl_process_certfp(ssl_ctl_t * ctl, ssl_ctl_buf_t * ctl_buf)
 483 {
 484         struct Client *client_p;
 485         uint32_t fd;
 486         uint32_t certfp_method;
 487         uint32_t len;
 488         uint8_t *certfp;
 489         char *certfp_string;
 490         const char *method_string;
 491         int method_len;
 492
 493         if(ctl_buf->buflen > 13 + RB_SSL_CERTFP_LEN)
 494                 return;         /* bogus message..drop it.. XXX should warn here */
 495
 496         fd = buf_to_uint32(&ctl_buf->buf[1]);
 497         certfp_method = buf_to_uint32(&ctl_buf->buf[5]);
 498         len = buf_to_uint32(&ctl_buf->buf[9]);
 499         certfp = (uint8_t *)&ctl_buf->buf[13];
 500         client_p = find_cli_connid_hash(fd);
 501         if(client_p == NULL)
 502                 return;
 503
 504         switch (certfp_method) {
 505         case RB_SSL_CERTFP_METH_CERT_SHA1:
 506                 method_string = CERTFP_PREFIX_CERT_SHA1;
 507                 break;
 508         case RB_SSL_CERTFP_METH_CERT_SHA256:
 509                 method_string = CERTFP_PREFIX_CERT_SHA256;
 510                 break;
 511         case RB_SSL_CERTFP_METH_CERT_SHA512:
 512                 method_string = CERTFP_PREFIX_CERT_SHA512;
 513                 break;
 514         case RB_SSL_CERTFP_METH_SPKI_SHA256:
 515                 method_string = CERTFP_PREFIX_SPKI_SHA256;
 516                 break;
 517         case RB_SSL_CERTFP_METH_SPKI_SHA512:
 518                 method_string = CERTFP_PREFIX_SPKI_SHA512;
 519                 break;
 520         default:
 521                 return;
 522         }
 523         method_len = strlen(method_string);
 524
 525         rb_free(client_p->certfp);
 526         certfp_string = rb_malloc(method_len + len * 2 + 1);
 527         rb_strlcpy(certfp_string, method_string, method_len + len * 2 + 1);
 528         for(uint32_t i = 0; i < len; i++)
 529                 snprintf(certfp_string + method_len + 2 * i, 3, "%02x",
 530                                 certfp[i]);
 531         client_p->certfp = certfp_string;
 532 }
 533
 534 static void
 535 ssl_process_cmd_recv(ssl_ctl_t * ctl)
 536 {
 537         static const char *cannot_setup_ssl = "ssld cannot setup ssl, check your certificates and private key";
 538         static const char *no_ssl_or_zlib = "ssld has neither SSL/TLS or zlib support killing all sslds";
 539         rb_dlink_node *ptr, *next;
 540         ssl_ctl_buf_t *ctl_buf;
 541         unsigned long len;
 542
 543         if(ctl->dead)
 544                 return;
 545
 546         RB_DLINK_FOREACH_SAFE(ptr, next, ctl->readq.head)
 547         {
 548                 ctl_buf = ptr->data;
 549                 switch (*ctl_buf->buf)
 550                 {
 551                 case 'N':
 552                         ircd_ssl_ok = false;    /* ssld says it can't do ssl/tls */
 553                         break;
 554                 case 'O':
 555                         ssl_process_open_fd(ctl, ctl_buf);
 556                         break;
 557                 case 'D':
 558                         ssl_process_dead_fd(ctl, ctl_buf);
 559                         break;
 560                 case 'C':
 561                         ssl_process_cipher_string(ctl, ctl_buf);
 562                         break;
 563                 case 'F':
 564                         ssl_process_certfp(ctl, ctl_buf);
 565                         break;
 566                 case 'S':
 567                         ssl_process_zipstats(ctl, ctl_buf);
 568                         break;
 569                 case 'I':
 570                         ircd_ssl_ok = false;
 571                         ilog(L_MAIN, "%s", cannot_setup_ssl);
 572                         sendto_realops_snomask(SNO_GENERAL, L_ALL, "%s", cannot_setup_ssl);
 573                         break;
 574                 case 'U':
 575                         ircd_zlib_ok = 0;
 576                         ircd_ssl_ok = false;
 577                         ilog(L_MAIN, "%s", no_ssl_or_zlib);
 578                         sendto_realops_snomask(SNO_GENERAL, L_ALL, "%s", no_ssl_or_zlib);
 579                         ssl_killall();
 580                         return;
 581                 case 'V':
 582                         len = ctl_buf->buflen - 1;
 583                         if (len > sizeof(ctl->version) - 1)
 584                                 len = sizeof(ctl->version) - 1;
 585                         strncpy(ctl->version, &ctl_buf->buf[1], len);
 586                 case 'z':
 587                         ircd_zlib_ok = 0;
 588                         break;
 589                 default:
 590                         ilog(L_MAIN, "Received invalid command from ssld: %s", ctl_buf->buf);
 591                         sendto_realops_snomask(SNO_GENERAL, L_ALL, "Received invalid command from ssld");
 592                         break;
 593                 }
 594                 rb_dlinkDelete(ptr, &ctl->readq);
 595                 rb_free(ctl_buf->buf);
 596                 rb_free(ctl_buf);
 597         }
 598
 599 }
 600
 601
 602 static void
 603 ssl_read_ctl(rb_fde_t * F, void *data)
 604 {
 605         ssl_ctl_buf_t *ctl_buf;
 606         ssl_ctl_t *ctl = data;
 607         int retlen;
 608
 609         if(ctl->dead)
 610                 return;
 611         do
 612         {
 613                 ctl_buf = rb_malloc(sizeof(ssl_ctl_buf_t));
 614                 ctl_buf->buf = rb_malloc(READSIZE);
 615                 retlen = rb_recv_fd_buf(ctl->F, ctl_buf->buf, READSIZE, ctl_buf->F, 4);
 616                 ctl_buf->buflen = retlen;
 617                 if(retlen <= 0)
 618                 {
 619                         rb_free(ctl_buf->buf);
 620                         rb_free(ctl_buf);
 621                 }
 622                 else
 623                         rb_dlinkAddTail(ctl_buf, &ctl_buf->node, &ctl->readq);
 624         }
 625         while(retlen > 0);
 626
 627         if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno)))
 628         {
 629                 ssl_dead(ctl);
 630                 return;
 631         }
 632         ssl_process_cmd_recv(ctl);
 633         rb_setselect(ctl->F, RB_SELECT_READ, ssl_read_ctl, ctl);
 634 }
 635
 636 static ssl_ctl_t *
 637 which_ssld(void)
 638 {
 639         ssl_ctl_t *ctl, *lowest = NULL;
 640         rb_dlink_node *ptr;
 641
 642         RB_DLINK_FOREACH(ptr, ssl_daemons.head)
 643         {
 644                 ctl = ptr->data;
 645                 if(ctl->dead)
 646                         continue;
 647                 if(ctl->shutdown)
 648                         continue;
 649                 if(lowest == NULL)
 650                 {
 651                         lowest = ctl;
 652                         continue;
 653                 }
 654                 if(ctl->cli_count < lowest->cli_count)
 655                         lowest = ctl;
 656         }
 657         return (lowest);
 658 }
 659
 660 static void
 661 ssl_write_ctl(rb_fde_t * F, void *data)
 662 {
 663         ssl_ctl_t *ctl = data;
 664         ssl_ctl_buf_t *ctl_buf;
 665         rb_dlink_node *ptr, *next;
 666         int retlen, x;
 667
 668         if(ctl->dead)
 669                 return;
 670
 671         RB_DLINK_FOREACH_SAFE(ptr, next, ctl->writeq.head)
 672         {
 673                 ctl_buf = ptr->data;
 674                 /* in theory unix sock_dgram shouldn't ever short write this.. */
 675                 retlen = rb_send_fd_buf(ctl->F, ctl_buf->F, ctl_buf->nfds, ctl_buf->buf, ctl_buf->buflen, ctl->pid);
 676                 if(retlen > 0)
 677                 {
 678                         rb_dlinkDelete(ptr, &ctl->writeq);
 679                         for(x = 0; x < ctl_buf->nfds; x++)
 680                                 rb_close(ctl_buf->F[x]);
 681                         rb_free(ctl_buf->buf);
 682                         rb_free(ctl_buf);
 683
 684                 }
 685                 if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno)))
 686                 {
 687                         ssl_dead(ctl);
 688                         return;
 689                 }
 690                 else
 691                 {
 692                         rb_setselect(ctl->F, RB_SELECT_WRITE, ssl_write_ctl, ctl);
 693                 }
 694         }
 695 }
 696
 697 static void
 698 ssl_cmd_write_queue(ssl_ctl_t * ctl, rb_fde_t ** F, int count, const void *buf, size_t buflen)
 699 {
 700         ssl_ctl_buf_t *ctl_buf;
 701         int x;
 702
 703         /* don't bother */
 704         if(ctl->dead)
 705                 return;
 706
 707         ctl_buf = rb_malloc(sizeof(ssl_ctl_buf_t));
 708         ctl_buf->buf = rb_malloc(buflen);
 709         memcpy(ctl_buf->buf, buf, buflen);
 710         ctl_buf->buflen = buflen;
 711
 712         for(x = 0; x < count && x < MAXPASSFD; x++)
 713         {
 714                 ctl_buf->F[x] = F[x];
 715         }
 716         ctl_buf->nfds = count;
 717         rb_dlinkAddTail(ctl_buf, &ctl_buf->node, &ctl->writeq);
 718         ssl_write_ctl(ctl->F, ctl);
 719 }
 720
 721
 722 static void
 723 send_new_ssl_certs_one(ssl_ctl_t * ctl)
 724 {
 725         size_t len = 5;
 726
 727         if(ServerInfo.ssl_cert)
 728                 len += strlen(ServerInfo.ssl_cert);
 729         else
 730                 return;
 731
 732         if(ServerInfo.ssl_private_key)
 733                 len += strlen(ServerInfo.ssl_private_key);
 734
 735         if(ServerInfo.ssl_dh_params)
 736                 len += strlen(ServerInfo.ssl_dh_params);
 737
 738         if(ServerInfo.ssl_cipher_list)
 739                 len += strlen(ServerInfo.ssl_cipher_list);
 740
 741         if(len > sizeof(tmpbuf))
 742         {
 743                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 744                                        "Parameters for send_new_ssl_certs_one too long (%zu > %zu) to pass to ssld, not sending...",
 745                                        len, sizeof(tmpbuf));
 746                 ilog(L_MAIN,
 747                      "Parameters for send_new_ssl_certs_one too long (%zu > %zu) to pass to ssld, not sending...",
 748                      len, sizeof(tmpbuf));
 749                 return;
 750         }
 751
 752         int ret = snprintf(tmpbuf, sizeof(tmpbuf), "K%c%s%c%s%c%s%c%s%c", nul,
 753                            ServerInfo.ssl_cert, nul,
 754                            ServerInfo.ssl_private_key != NULL ? ServerInfo.ssl_private_key : "", nul,
 755                            ServerInfo.ssl_dh_params != NULL ? ServerInfo.ssl_dh_params : "", nul,
 756                            ServerInfo.ssl_cipher_list != NULL ? ServerInfo.ssl_cipher_list : "", nul);
 757
 758         if(ret > 5)
 759                 ssl_cmd_write_queue(ctl, NULL, 0, tmpbuf, (size_t) ret);
 760 }
 761
 762 static void
 763 send_certfp_method(ssl_ctl_t *ctl)
 764 {
 765         char buf[5];
 766
 767         buf[0] = 'F';
 768         uint32_to_buf(&buf[1], ConfigFileEntry.certfp_method);
 769         ssl_cmd_write_queue(ctl, NULL, 0, buf, sizeof(buf));
 770 }
 771
 772 static void
 773 ssld_update_config_one(ssl_ctl_t *ctl)
 774 {
 775         send_certfp_method(ctl);
 776         send_new_ssl_certs_one(ctl);
 777 }
 778
 779 void
 780 ssld_update_config(void)
 781 {
 782         rb_dlink_node *ptr;
 783
 784         RB_DLINK_FOREACH(ptr, ssl_daemons.head)
 785         {
 786                 ssl_ctl_t *ctl = ptr->data;
 787
 788                 if (ctl->dead || ctl->shutdown)
 789                         continue;
 790
 791                 ssld_update_config_one(ctl);
 792         }
 793 }
 794
 795 ssl_ctl_t *
 796 start_ssld_accept(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] = 'A';
 805         uint32_to_buf(&buf[1], id);
 806         ctl = which_ssld();
 807         if(!ctl)
 808                 return NULL;
 809         ctl->cli_count++;
 810         ssl_cmd_write_queue(ctl, F, 2, buf, sizeof(buf));
 811         return ctl;
 812 }
 813
 814 ssl_ctl_t *
 815 start_ssld_connect(rb_fde_t * sslF, rb_fde_t * plainF, uint32_t id)
 816 {
 817         rb_fde_t *F[2];
 818         ssl_ctl_t *ctl;
 819         char buf[5];
 820         F[0] = sslF;
 821         F[1] = plainF;
 822
 823         buf[0] = 'C';
 824         uint32_to_buf(&buf[1], id);
 825
 826         ctl = which_ssld();
 827         if(!ctl)
 828                 return NULL;
 829         ctl->cli_count++;
 830         ssl_cmd_write_queue(ctl, F, 2, buf, sizeof(buf));
 831         return ctl;
 832 }
 833
 834 void
 835 ssld_decrement_clicount(ssl_ctl_t * ctl)
 836 {
 837         if(ctl == NULL)
 838                 return;
 839
 840         ctl->cli_count--;
 841         if(ctl->shutdown && !ctl->cli_count)
 842         {
 843                 ctl->dead = 1;
 844                 rb_kill(ctl->pid, SIGKILL);
 845         }
 846         if(ctl->dead && !ctl->cli_count)
 847         {
 848                 free_ssl_daemon(ctl);
 849         }
 850 }
 851
 852 /*
 853  * what we end up sending to the ssld process for ziplinks is the following
 854  * Z[ourfd][level][RECVQ]
 855  * Z = ziplinks command = buf[0]
 856  * ourfd = Our end of the socketpair = buf[1..4]
 857  * level = zip level buf[5]
 858  * recvqlen = our recvq len = buf[6-7]
 859  * recvq = any data we read prior to starting ziplinks
 860  */
 861 void
 862 start_zlib_session(void *data)
 863 {
 864         struct Client *server = (struct Client *) data;
 865         uint16_t recvqlen;
 866         uint8_t level;
 867         void *xbuf;
 868
 869         rb_fde_t *F[2];
 870         rb_fde_t *xF1, *xF2;
 871         char *buf;
 872         void *recvq_start;
 873
 874         size_t hdr = (sizeof(uint8_t) * 2) + sizeof(uint32_t);
 875         size_t len;
 876         int cpylen, left;
 877
 878         server->localClient->event = NULL;
 879
 880         recvqlen = rb_linebuf_len(&server->localClient->buf_recvq);
 881
 882         len = recvqlen + hdr;
 883
 884         if(len > READBUF_SIZE)
 885         {
 886                 sendto_realops_snomask(SNO_GENERAL, L_ALL,
 887                                        "ssld - attempted to pass message of %zd len, max len %d, giving up",
 888                                        len, READBUF_SIZE);
 889                 ilog(L_MAIN, "ssld - attempted to pass message of %zd len, max len %d, giving up", len, READBUF_SIZE);
 890                 exit_client(server, server, server, "ssld readbuf exceeded");
 891                 return;
 892         }
 893
 894         buf = rb_malloc(len);
 895         level = ConfigFileEntry.compression_level;
 896
 897         uint32_to_buf(&buf[1], rb_get_fd(server->localClient->F));
 898         buf[5] = (char) level;
 899
 900         recvq_start = &buf[6];
 901         server->localClient->zipstats = rb_malloc(sizeof(struct ZipStats));
 902
 903         xbuf = recvq_start;
 904         left = recvqlen;
 905
 906         do
 907         {
 908                 cpylen = rb_linebuf_get(&server->localClient->buf_recvq, xbuf, left, LINEBUF_PARTIAL, LINEBUF_RAW);
 909                 left -= cpylen;
 910                 xbuf = (void *) (((uintptr_t) xbuf) + cpylen);
 911         }
 912         while(cpylen > 0);
 913
 914         /* Pass the socket to ssld. */
 915         *buf = 'Z';
 916         if(rb_socketpair(AF_UNIX, SOCK_STREAM, 0, &xF1, &xF2, "Initial zlib socketpairs") == -1)
 917         {
 918                 sendto_realops_snomask(SNO_GENERAL, L_ALL, "Error creating zlib socketpair - %s", strerror(errno));
 919                 ilog(L_MAIN, "Error creating zlib socketpairs - %s", strerror(errno));
 920                 exit_client(server, server, server, "Error creating zlib socketpair");
 921                 rb_free(buf);
 922                 return;
 923         }
 924
 925         F[0] = server->localClient->F;
 926         F[1] = xF1;
 927         server->localClient->F = xF2;
 928         /* need to redo as what we did before isn't valid now */
 929         uint32_to_buf(&buf[1], connid_get(server));
 930
 931         server->localClient->z_ctl = which_ssld();
 932         if(!server->localClient->z_ctl)
 933         {
 934                 exit_client(server, server, server, "Error finding available ssld");
 935                 rb_free(buf);
 936                 return;
 937         }
 938         server->localClient->z_ctl->cli_count++;
 939         ssl_cmd_write_queue(server->localClient->z_ctl, F, 2, buf, len);
 940         rb_free(buf);
 941 }
 942
 943 static void
 944 collect_zipstats(void *unused)
 945 {
 946         rb_dlink_node *ptr;
 947         struct Client *target_p;
 948         char buf[sizeof(uint8_t) + sizeof(uint32_t) + HOSTLEN];
 949         void *odata;
 950         size_t len;
 951         uint32_t id;
 952
 953         buf[0] = 'S';
 954         odata = buf + sizeof(uint8_t) + sizeof(uint32_t);
 955
 956         RB_DLINK_FOREACH(ptr, serv_list.head)
 957         {
 958                 target_p = ptr->data;
 959                 if(IsCapable(target_p, CAP_ZIP))
 960                 {
 961                         len = sizeof(uint8_t) + sizeof(uint32_t);
 962
 963                         id = rb_get_fd(target_p->localClient->F);
 964                         uint32_to_buf(&buf[1], id);
 965                         rb_strlcpy(odata, target_p->name, (sizeof(buf) - len));
 966                         len += strlen(odata) + 1;       /* Get the \0 as well */
 967                         ssl_cmd_write_queue(target_p->localClient->z_ctl, NULL, 0, buf, len);
 968                 }
 969         }
 970 }
 971
 972 static void
 973 cleanup_dead_ssl(void *unused)
 974 {
 975         rb_dlink_node *ptr, *next;
 976         ssl_ctl_t *ctl;
 977         RB_DLINK_FOREACH_SAFE(ptr, next, ssl_daemons.head)
 978         {
 979                 ctl = ptr->data;
 980                 if(ctl->dead && !ctl->cli_count)
 981                 {
 982                         free_ssl_daemon(ctl);
 983                 }
 984         }
 985 }
 986
 987 int
 988 get_ssld_count(void)
 989 {
 990         return ssld_count;
 991 }
 992
 993 void
 994 ssld_foreach_info(void (*func)(void *data, pid_t pid, int cli_count, enum ssld_status status, const char *version), void *data)
 995 {
 996         rb_dlink_node *ptr, *next;
 997         ssl_ctl_t *ctl;
 998         RB_DLINK_FOREACH_SAFE(ptr, next, ssl_daemons.head)
 999         {
1000                 ctl = ptr->data;
1001                 func(data, ctl->pid, ctl->cli_count,
1002                         ctl->dead ? SSLD_DEAD :
1003                                 (ctl->shutdown ? SSLD_SHUTDOWN : SSLD_ACTIVE),
1004                         ctl->version);
1005         }
1006 }
1007
1008 void
1009 init_ssld(void)
1010 {
1011         rb_event_addish("collect_zipstats", collect_zipstats, NULL, ZIPSTATS_TIME);
1012         rb_event_addish("cleanup_dead_ssld", cleanup_dead_ssl, NULL, 60);
1013 }