authd/providers/opm.c

   1 /* authd/providers/opm.c - small open proxy monitor
   2  * Copyright (c) 2016 Elizabeth Myers <elizabeth@interlinked.me>
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice is present in all copies.
   7  *
   8  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   9  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  10  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  11  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  12  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  13  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  14  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  15  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  16  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  17  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  18  * POSSIBILITY OF SUCH DAMAGE.
  19  */
  20
  21 #include "rb_lib.h"
  22 #include "stdinc.h"
  23 #include "setup.h"
  24 #include "authd.h"
  25 #include "notice.h"
  26 #include "provider.h"
  27
  28 #define SELF_PID (opm_provider.id)
  29
  30 #define OPM_READSIZE 128
  31
  32 typedef enum protocol_t
  33 {
  34         PROTO_NONE,
  35         PROTO_SOCKS4,
  36         PROTO_SOCKS5,
  37         PROTO_HTTP_CONNECT,
  38         PROTO_HTTPS_CONNECT,
  39 } protocol_t;
  40
  41 struct opm_lookup
  42 {
  43         rb_dlink_list scans;    /* List of scans */
  44         bool in_progress;
  45 };
  46
  47 struct opm_proxy
  48 {
  49         char note[16];
  50         protocol_t proto;
  51         uint16_t port;
  52         bool ssl;
  53
  54         rb_dlink_node node;
  55 };
  56
  57 struct opm_scan
  58 {
  59         struct auth_client *auth;
  60
  61         struct opm_proxy *proxy;
  62         rb_fde_t *F;            /* fd for scan */
  63
  64         rb_dlink_node node;
  65 };
  66
  67 struct opm_listener
  68 {
  69         char ip[HOSTIPLEN];
  70         uint16_t port;
  71         struct rb_sockaddr_storage addr;
  72         rb_fde_t *F;
  73 };
  74
  75 /* Proxies that we scan for */
  76 static rb_dlink_list proxy_scanners;
  77
  78 static ACCB accept_opm;
  79 static PF read_opm_reply;
  80
  81 static CNCB socks4_connected;
  82 static CNCB socks5_connected;
  83
  84 static void opm_cancel(struct auth_client *auth);
  85 static bool create_listener(const char *ip, uint16_t port);
  86
  87 static int opm_timeout = 10;
  88 static bool opm_enable = false;
  89
  90 #define LISTEN_IPV4 0
  91 #define LISTEN_IPV6 1
  92
  93 /* IPv4 and IPv6 */
  94 static struct opm_listener listeners[2];
  95
  96 static inline protocol_t
  97 get_protocol_from_string(const char *str)
  98 {
  99         if(strcasecmp(str, "socks4") == 0)
 100                 return PROTO_SOCKS4;
 101         else if(strcasecmp(str, "socks5") == 0)
 102                 return PROTO_SOCKS5;
 103         else if(strcasecmp(str, "httpconnect") == 0)
 104                 return PROTO_HTTP_CONNECT;
 105         else if(strcasecmp(str, "httpsconnect") == 0)
 106                 return PROTO_HTTPS_CONNECT;
 107         else
 108                 return PROTO_NONE;
 109 }
 110
 111 static inline struct opm_proxy *
 112 find_proxy_scanner(protocol_t proto, uint16_t port)
 113 {
 114         rb_dlink_node *ptr;
 115
 116         RB_DLINK_FOREACH(ptr, proxy_scanners.head)
 117         {
 118                 struct opm_proxy *proxy = ptr->data;
 119
 120                 if(proxy->proto == proto && proxy->port == port)
 121                         return proxy;
 122         }
 123
 124         return NULL;
 125 }
 126
 127 /* This is called when an open proxy connects to us */
 128 static void
 129 read_opm_reply(rb_fde_t *F, void *data)
 130 {
 131         rb_dlink_node *ptr;
 132         struct auth_client *auth = data;
 133         struct opm_lookup *lookup;
 134         char readbuf[OPM_READSIZE];
 135         ssize_t len;
 136
 137         lrb_assert(auth != NULL);
 138         lookup = get_provider_data(auth, SELF_PID);
 139         lrb_assert(lookup != NULL);
 140
 141         if((len = rb_read(F, readbuf, sizeof(readbuf))) < 0 && rb_ignore_errno(errno))
 142         {
 143                 rb_setselect(F, RB_SELECT_READ, read_opm_reply, auth);
 144                 return;
 145         }
 146         else if(len <= 0)
 147         {
 148                 /* Dead */
 149                 rb_close(F);
 150                 return;
 151         }
 152
 153         RB_DLINK_FOREACH(ptr, proxy_scanners.head)
 154         {
 155                 struct opm_proxy *proxy = ptr->data;
 156
 157                 if(strncmp(proxy->note, readbuf, strlen(proxy->note)) == 0)
 158                 {
 159                         rb_dlink_node *ptr, *nptr;
 160
 161                         /* Cancel outstanding lookups */
 162                         RB_DLINK_FOREACH_SAFE(ptr, nptr, lookup->scans.head)
 163                         {
 164                                 struct opm_scan *scan = ptr->data;
 165
 166                                 rb_close(scan->F);
 167                                 rb_free(scan);
 168                         }
 169
 170                         /* No longer needed, client is going away */
 171                         rb_free(lookup);
 172
 173                         reject_client(auth, SELF_PID, readbuf, "Open proxy detected");
 174                         break;
 175                 }
 176         }
 177
 178         rb_close(F);
 179 }
 180
 181 static void
 182 accept_opm(rb_fde_t *F, int status, struct sockaddr *addr, rb_socklen_t len, void *data)
 183 {
 184         struct auth_client *auth = NULL;
 185         struct opm_listener *listener = data;
 186         struct rb_sockaddr_storage localaddr;
 187         unsigned int llen = sizeof(struct rb_sockaddr_storage);
 188         rb_dictionary_iter iter;
 189
 190         if(status != 0 || listener == NULL)
 191         {
 192                 rb_close(F);
 193                 return;
 194         }
 195
 196         if(getsockname(rb_get_fd(F), (struct sockaddr *)&localaddr, &llen))
 197         {
 198                 /* This can happen if the client goes away after accept */
 199                 rb_close(F);
 200                 return;
 201         }
 202
 203         /* Correlate connection with client(s) */
 204         RB_DICTIONARY_FOREACH(auth, &iter, auth_clients)
 205         {
 206                 if(GET_SS_FAMILY(&auth->c_addr) != GET_SS_FAMILY(&localaddr))
 207                         continue;
 208
 209                 /* Compare the addresses */
 210                 switch(GET_SS_FAMILY(&localaddr))
 211                 {
 212                 case AF_INET:
 213                         {
 214                                 struct sockaddr_in *s = (struct sockaddr_in *)&localaddr, *c = (struct sockaddr_in *)&auth->c_addr;
 215
 216                                 if(s->sin_addr.s_addr == c->sin_addr.s_addr)
 217                                 {
 218                                         /* Match... check if it's real */
 219                                         rb_setselect(F, RB_SELECT_READ, read_opm_reply, auth);
 220                                         return;
 221                                 }
 222                                 break;
 223                         }
 224 #ifdef RB_IPV6
 225                 case AF_INET6:
 226                         {
 227                                 struct sockaddr_in6 *s = (struct sockaddr_in6 *)&localaddr, *c = (struct sockaddr_in6 *)&auth->c_addr;
 228
 229                                 if(IN6_ARE_ADDR_EQUAL(&s->sin6_addr, &c->sin6_addr))
 230                                 {
 231                                         rb_setselect(F, RB_SELECT_READ, read_opm_reply, auth);
 232                                         return;
 233                                 }
 234                                 break;
 235                         }
 236 #endif
 237                 default:
 238                         warn_opers(L_CRIT, "OPM: unknown address type in listen function");
 239                         exit(EX_PROVIDER_ERROR);
 240                 }
 241         }
 242
 243         /* We don't care about the socket if we get here */
 244         rb_close(F);
 245 }
 246
 247 /* Scanners */
 248
 249 static void
 250 socks4_connected(rb_fde_t *F, int error, void *data)
 251 {
 252         struct opm_scan *scan = data;
 253         struct opm_lookup *lookup;
 254         struct auth_client *auth;
 255         uint8_t sendbuf[9]; /* Size we're building */
 256         uint8_t *c = sendbuf;
 257         ssize_t ret;
 258
 259         if(error || !opm_enable)
 260                 goto end;
 261
 262         lrb_assert(scan != NULL);
 263
 264         auth = scan->auth;
 265         lookup = get_provider_data(auth, SELF_PID);
 266
 267         memcpy(c, "\x04\x01", 2); c += 2; /* Socks version 4, connect command */
 268
 269         switch(GET_SS_FAMILY(&auth->c_addr))
 270         {
 271         case AF_INET:
 272                 if(listeners[LISTEN_IPV4].F == NULL)
 273                         /* They cannot respond to us */
 274                         goto end;
 275
 276                 memcpy(c, &(((struct sockaddr_in *)&listeners[LISTEN_IPV4].addr)->sin_port), 2); c += 2; /* Port */
 277                 memcpy(c, &(((struct sockaddr_in *)&listeners[LISTEN_IPV4].addr)->sin_addr.s_addr), 4); c += 4; /* Address */
 278                 break;
 279 #ifdef RB_IPV6
 280         case AF_INET6:
 281         /* socks4 doesn't support IPv6 */
 282 #endif
 283         default:
 284                 goto end;
 285         }
 286
 287         *c = '\x00'; /* No userid */
 288
 289         /* Send header */
 290         if(rb_write(scan->F, sendbuf, sizeof(sendbuf)) < 0)
 291                 goto end;
 292
 293         /* Send note */
 294         if(rb_write(scan->F, scan->proxy->note, strlen(scan->proxy->note) + 1) < 0)
 295                 goto end;
 296
 297 end:
 298         rb_close(scan->F);
 299         rb_dlinkDelete(&scan->node, &lookup->scans);
 300         rb_free(scan);
 301 }
 302
 303 static void
 304 socks5_connected(rb_fde_t *F, int error, void *data)
 305 {
 306         struct opm_scan *scan = data;
 307         struct opm_lookup *lookup;
 308         struct opm_listener *listener;
 309         struct auth_client *auth;
 310         uint8_t sendbuf[25]; /* Size we're building */
 311         uint8_t *c = sendbuf;
 312         ssize_t ret;
 313
 314         if(error || !opm_enable)
 315                 goto end;
 316
 317         lrb_assert(scan != NULL);
 318
 319         auth = scan->auth;
 320         lookup = get_provider_data(auth, SELF_PID);
 321
 322         /* Build the version header and socks request
 323          * version header (3 bytes): version, number of auth methods, auth type (0 for none)
 324          * connect req (3 bytes): version, command (1 = connect), reserved (0)
 325          */
 326         memcpy(c, "\x05\x01\x00\x05\x01\x00", 6); c += 6;
 327
 328         switch(GET_SS_FAMILY(&auth->c_addr))
 329         {
 330         case AF_INET:
 331                 listener = &listeners[LISTEN_IPV4];
 332                 if(!listener->F)
 333                         goto end;
 334
 335                 *(c++) = '\x01'; /* Address type (1 = IPv4) */
 336                 memcpy(c, &(((struct sockaddr_in *)&listener->addr)->sin_addr.s_addr), 4); c += 4;/* Address */
 337                 memcpy(c, &(((struct sockaddr_in *)&listener->addr)->sin_port), 2); c += 2; /* Port */
 338                 break;
 339 #ifdef RB_IPV6
 340         case AF_INET6:
 341                 listener = &listeners[LISTEN_IPV6];
 342                 if(!listener->F)
 343                         goto end;
 344
 345                 *(c++) = '\x04'; /* Address type (4 = IPv6) */
 346                 memcpy(c, ((struct sockaddr_in6 *)&listener->addr)->sin6_addr.s6_addr, 16); c += 16; /* Address */
 347                 memcpy(c, &(((struct sockaddr_in6 *)&listener->addr)->sin6_port), 2); c += 2; /* Port */
 348                 break;
 349 #endif
 350         default:
 351                 goto end;
 352         }
 353
 354         /* Send header */
 355         if(rb_write(scan->F, sendbuf, (size_t)(sendbuf - c)) <= 0)
 356                 goto end;
 357
 358         /* Now the note in a separate write */
 359         if(rb_write(scan->F, scan->proxy->note, strlen(scan->proxy->note) + 1) <= 0)
 360                 goto end;
 361
 362 end:
 363         rb_close(scan->F);
 364         rb_dlinkDelete(&scan->node, &lookup->scans);
 365         rb_free(scan);
 366 }
 367
 368 static void
 369 http_connect_connected(rb_fde_t *F, int error, void *data)
 370 {
 371         struct opm_scan *scan = data;
 372         struct opm_lookup *lookup;
 373         struct opm_listener *listener;
 374         struct auth_client *auth;
 375         char sendbuf[128]; /* A bit bigger than we need but better safe than sorry */
 376         char *c = sendbuf;
 377         ssize_t ret;
 378
 379         if(error || !opm_enable)
 380                 goto end;
 381
 382         lrb_assert(scan != NULL);
 383
 384         auth = scan->auth;
 385         lookup = get_provider_data(auth, SELF_PID);
 386
 387         switch(GET_SS_FAMILY(&auth->c_addr))
 388         {
 389         case AF_INET:
 390                 listener = &listeners[LISTEN_IPV4];
 391                 if(!listener->F)
 392                         goto end;
 393                 break;
 394 #ifdef RB_IPV6
 395         case AF_INET6:
 396                 listener = &listeners[LISTEN_IPV6];
 397                 if(!listener->F)
 398                         goto end;
 399                 break;
 400 #endif
 401         default:
 402                 goto end;
 403         }
 404
 405         /* Simple enough to build */
 406         snprintf(sendbuf, sizeof(sendbuf), "CONNECT %s:%hu HTTP/1.0\r\n\r\n", listener->ip, listener->port);
 407
 408         /* Send request */
 409         if(rb_write(scan->F, sendbuf, strlen(sendbuf)) <= 0)
 410                 goto end;
 411
 412         /* Now the note in a separate write */
 413         if(rb_write(scan->F, scan->proxy->note, strlen(scan->proxy->note) + 1) <= 0)
 414                 goto end;
 415
 416         /* MiroTik needs this, and as a separate write */
 417         if(rb_write(scan->F, "\r\n", 2) <= 0)
 418                 goto end;
 419
 420 end:
 421         rb_close(scan->F);
 422         rb_dlinkDelete(&scan->node, &lookup->scans);
 423         rb_free(scan);
 424 }
 425
 426 /* Establish connections */
 427 static inline void
 428 establish_connection(struct auth_client *auth, struct opm_proxy *proxy)
 429 {
 430         struct opm_lookup *lookup = get_provider_data(auth, SELF_PID);
 431         struct opm_listener *listener;
 432         struct opm_scan *scan = rb_malloc(sizeof(struct opm_scan));
 433         struct rb_sockaddr_storage c_a, l_a;
 434         int opt = 1;
 435         CNCB *callback;
 436
 437         lrb_assert(lookup != NULL);
 438
 439         switch(proxy->proto)
 440         {
 441         case PROTO_SOCKS4:
 442 #ifdef RB_IPV6
 443                 /* SOCKS4 is IPv4 only */
 444                 if(GET_SS_FAMILY(&auth->c_addr) == AF_INET6)
 445                 {
 446                         rb_free(scan);
 447                         return;
 448                 }
 449 #endif
 450                 callback = socks4_connected;
 451                 break;
 452         case PROTO_SOCKS5:
 453                 callback = socks5_connected;
 454                 break;
 455         case PROTO_HTTP_CONNECT:
 456         case PROTO_HTTPS_CONNECT:
 457                 callback = http_connect_connected;
 458         default:
 459                 return;
 460         }
 461
 462 #ifdef RB_IPV6
 463         if(GET_SS_FAMILY(&auth->c_addr) == AF_INET6)
 464                 listener = &listeners[LISTEN_IPV6];
 465         else
 466 #endif
 467                 listener = &listeners[LISTEN_IPV4];
 468
 469         c_a = auth->c_addr;     /* Client */
 470         l_a = listener->addr;   /* Listener */
 471
 472         scan->auth = auth;
 473         scan->proxy = proxy;
 474         if((scan->F = rb_socket(GET_SS_FAMILY(&auth->c_addr), SOCK_STREAM, 0, proxy->note)) == NULL)
 475         {
 476                 warn_opers(L_WARN, "OPM: could not create OPM socket (proto %s): %s", proxy->note, strerror(errno));
 477                 rb_free(scan);
 478                 return;
 479         }
 480
 481         /* Disable Nagle's algorithim - buffering could affect scans */
 482         (void)setsockopt(rb_get_fd(scan->F), IPPROTO_TCP, TCP_NODELAY, (char *)&opt, sizeof(opt));
 483
 484         SET_SS_PORT(&l_a, 0);
 485         SET_SS_PORT(&c_a, htons(proxy->port));
 486
 487         rb_dlinkAdd(scan, &scan->node, &lookup->scans);
 488
 489         if(!proxy->ssl)
 490                 rb_connect_tcp(scan->F,
 491                                 (struct sockaddr *)&c_a,
 492                                 (struct sockaddr *)&l_a,
 493                                 GET_SS_LEN(&l_a),
 494                                 callback, scan, opm_timeout);
 495         else
 496                 rb_connect_tcp_ssl(scan->F,
 497                                 (struct sockaddr *)&c_a,
 498                                 (struct sockaddr *)&l_a,
 499                                 GET_SS_LEN(&l_a),
 500                                 callback, scan, opm_timeout);
 501 }
 502
 503 static bool
 504 create_listener(const char *ip, uint16_t port)
 505 {
 506         struct auth_client *auth;
 507         struct opm_listener *listener;
 508         struct rb_sockaddr_storage addr;
 509         rb_dictionary_iter iter;
 510         rb_fde_t *F;
 511         int opt = 1;
 512
 513         if(!rb_inet_pton_sock(ip, (struct sockaddr *)&addr))
 514         {
 515                 warn_opers(L_CRIT, "OPM: got a bad listener: %s:%hu", ip, port);
 516                 exit(EX_PROVIDER_ERROR);
 517         }
 518
 519         SET_SS_PORT(&addr, htons(port));
 520
 521 #ifdef RB_IPV6
 522         if(GET_SS_FAMILY(&addr) == AF_INET6)
 523         {
 524                 struct sockaddr_in6 *a1, *a2;
 525
 526                 listener = &listeners[LISTEN_IPV6];
 527
 528                 a1 = (struct sockaddr_in6 *)&addr;
 529                 a2 = (struct sockaddr_in6 *)&listener->addr;
 530
 531                 if(IN6_ARE_ADDR_EQUAL(&a1->sin6_addr, &a2->sin6_addr) &&
 532                         GET_SS_PORT(&addr) == GET_SS_PORT(&listener->addr) &&
 533                         listener->F != NULL)
 534                 {
 535                         /* Listener already exists */
 536                         return false;
 537                 }
 538         }
 539         else
 540 #endif
 541         {
 542                 struct sockaddr_in *a1, *a2;
 543
 544                 listener = &listeners[LISTEN_IPV4];
 545
 546                 a1 = (struct sockaddr_in *)&addr;
 547                 a2 = (struct sockaddr_in *)&listener->addr;
 548
 549                 if(a1->sin_addr.s_addr == a2->sin_addr.s_addr &&
 550                         GET_SS_PORT(&addr) == GET_SS_PORT(&listener->addr) &&
 551                         listener->F != NULL)
 552                 {
 553                         /* Listener already exists */
 554                         return false;
 555                 }
 556         }
 557
 558         if((F = rb_socket(GET_SS_FAMILY(&addr), SOCK_STREAM, 0, "OPM listener socket")) == NULL)
 559         {
 560                 /* This shouldn't fail, or we have big problems... */
 561                 warn_opers(L_CRIT, "OPM: cannot create socket: %s", strerror(errno));
 562                 exit(EX_PROVIDER_ERROR);
 563         }
 564
 565         if(setsockopt(rb_get_fd(F), SOL_SOCKET, SO_REUSEADDR, (char *)&opt, sizeof(opt)))
 566         {
 567                 /* This shouldn't fail either... */
 568                 warn_opers(L_CRIT, "OPM: cannot set options on socket: %s", strerror(errno));
 569                 exit(EX_PROVIDER_ERROR);
 570         }
 571
 572         if(bind(rb_get_fd(F), (struct sockaddr *)&addr, GET_SS_LEN(&addr)))
 573         {
 574                 /* Shit happens, let's not cripple authd over /this/ since it could be user error */
 575                 warn_opers(L_WARN, "OPM: cannot bind on socket: %s", strerror(errno));
 576                 rb_close(F);
 577                 return false;
 578         }
 579
 580         if(rb_listen(F, SOMAXCONN, false)) /* deferred accept could interfere with detection */
 581         {
 582                 /* Again, could be user error */
 583                 warn_opers(L_WARN, "OPM: cannot listen on socket: %s", strerror(errno));
 584                 rb_close(F);
 585                 return false;
 586         }
 587
 588         /* From this point forward we assume we have a listener */
 589
 590         if(listener->F != NULL)
 591                 /* Close old listener */
 592                 rb_close(listener->F);
 593
 594         listener->F = F;
 595
 596         /* Cancel clients that may be on old listener
 597          * XXX - should rescan clients that need it
 598          */
 599         RB_DICTIONARY_FOREACH(auth, &iter, auth_clients)
 600         {
 601                 opm_cancel(auth);
 602         }
 603
 604         /* Copy data */
 605         rb_strlcpy(listener->ip, ip, sizeof(listener->ip));
 606         listener->port = port;
 607         listener->addr = addr;
 608
 609         opm_enable = true; /* Implicitly set this to true for now if we have a listener */
 610         rb_accept_tcp(listener->F, NULL, accept_opm, listener);
 611         return true;
 612 }
 613
 614 static void
 615 opm_scan(struct auth_client *auth)
 616 {
 617         rb_dlink_node *ptr;
 618         struct opm_lookup *lookup;
 619
 620         lrb_assert(auth != NULL);
 621
 622         lookup = get_provider_data(auth, SELF_PID);
 623         set_provider_timeout_relative(auth, SELF_PID, opm_timeout);
 624
 625         lookup->in_progress = true;
 626
 627         RB_DLINK_FOREACH(ptr, proxy_scanners.head)
 628         {
 629                 struct opm_proxy *proxy = ptr->data;
 630                 establish_connection(auth, proxy);
 631         }
 632
 633         notice_client(auth->cid, "*** Scanning for open proxies...");
 634 }
 635
 636 /* This is called every time a provider is completed as long as we are marked not done */
 637 static void
 638 opm_initiate(struct auth_client *auth, uint32_t provider)
 639 {
 640         struct opm_lookup *lookup = get_provider_data(auth, SELF_PID);
 641         uint32_t rdns_pid, ident_pid;
 642
 643         lrb_assert(provider != SELF_PID);
 644         lrb_assert(!is_provider_done(auth, SELF_PID));
 645         lrb_assert(rb_dlink_list_length(&proxy_scanners) > 0);
 646
 647         if(lookup == NULL || lookup->in_progress)
 648                 /* Nothing to do */
 649                 return;
 650         else if((!get_provider_id("rdns", &rdns_pid) || is_provider_done(auth, rdns_pid)) &&
 651                 (!get_provider_id("ident", &ident_pid) || is_provider_done(auth, ident_pid)))
 652                 /* Don't start until ident and rdns are finished (or not loaded) */
 653                 return;
 654         else
 655                 opm_scan(auth);
 656 }
 657
 658 static bool
 659 opm_start(struct auth_client *auth)
 660 {
 661         uint32_t rdns_pid, ident_pid;
 662
 663         lrb_assert(get_provider_data(auth, SELF_PID) == NULL);
 664
 665         if(!opm_enable || rb_dlink_list_length(&proxy_scanners) == 0)
 666         {
 667                 /* Nothing to do... */
 668                 notice_client(auth->cid, "*** Proxy scanning disabled, not scanning");
 669                 return true;
 670         }
 671
 672         set_provider_data(auth, SELF_PID, rb_malloc(sizeof(struct opm_lookup)));
 673
 674         if((!get_provider_id("rdns", &rdns_pid) || is_provider_done(auth, rdns_pid)) &&
 675                 (!get_provider_id("ident", &ident_pid) || is_provider_done(auth, ident_pid)))
 676         {
 677                 /* Don't start until ident and rdns are finished (or not loaded) */
 678                 opm_scan(auth);
 679         }
 680
 681         set_provider_running(auth, SELF_PID);
 682         return true;
 683 }
 684
 685 static void
 686 opm_cancel(struct auth_client *auth)
 687 {
 688         struct opm_lookup *lookup = get_provider_data(auth, SELF_PID);
 689
 690         if(lookup != NULL)
 691         {
 692                 rb_dlink_node *ptr, *nptr;
 693
 694                 notice_client(auth->cid, "*** Did not detect open proxies");
 695
 696                 RB_DLINK_FOREACH_SAFE(ptr, nptr, lookup->scans.head)
 697                 {
 698                         struct opm_scan *scan = ptr->data;
 699
 700                         rb_close(scan->F);
 701                         rb_free(scan);
 702                 }
 703
 704                 rb_free(lookup);
 705
 706                 set_provider_data(auth, SELF_PID, NULL);
 707                 set_provider_timeout_absolute(auth, SELF_PID, 0);
 708                 provider_done(auth, SELF_PID);
 709         }
 710 }
 711
 712 static void
 713 opm_destroy(void)
 714 {
 715         struct auth_client *auth;
 716         rb_dictionary_iter iter;
 717
 718         /* Nuke all opm lookups */
 719         RB_DICTIONARY_FOREACH(auth, &iter, auth_clients)
 720         {
 721                 opm_cancel(auth);
 722         }
 723 }
 724
 725
 726 static void
 727 add_conf_opm_timeout(const char *key __unused, int parc __unused, const char **parv)
 728 {
 729         int timeout = atoi(parv[0]);
 730
 731         if(timeout < 0)
 732         {
 733                 warn_opers(L_CRIT, "opm: opm timeout < 0 (value: %d)", timeout);
 734                 return;
 735         }
 736
 737         opm_timeout = timeout;
 738 }
 739
 740 static void
 741 set_opm_enabled(const char *key __unused, int parc __unused, const char **parv)
 742 {
 743         bool enable = (*parv[0] == '1');
 744
 745         if(!enable)
 746         {
 747                 if(listeners[LISTEN_IPV4].F != NULL || listeners[LISTEN_IPV6].F != NULL)
 748                 {
 749                         struct auth_client *auth;
 750                         rb_dictionary_iter iter;
 751
 752                         /* Close the listening socket */
 753                         if(listeners[LISTEN_IPV4].F != NULL)
 754                                 rb_close(listeners[LISTEN_IPV4].F);
 755
 756                         if(listeners[LISTEN_IPV6].F != NULL)
 757                                 rb_close(listeners[LISTEN_IPV6].F);
 758
 759                         listeners[LISTEN_IPV4].F = listeners[LISTEN_IPV6].F = NULL;
 760
 761                         RB_DICTIONARY_FOREACH(auth, &iter, auth_clients)
 762                         {
 763                                 opm_cancel(auth);
 764                         }
 765                 }
 766         }
 767         else
 768         {
 769                 if(listeners[LISTEN_IPV4].ip[0] != '\0' && listeners[LISTEN_IPV4].port != 0)
 770                 {
 771                         lrb_assert(listeners[LISTEN_IPV4].F == NULL);
 772
 773                         /* Pre-configured IP/port, just re-establish */
 774                         create_listener(listeners[LISTEN_IPV4].ip, listeners[LISTEN_IPV4].port);
 775                 }
 776
 777                 if(listeners[LISTEN_IPV6].ip[0] != '\0' && listeners[LISTEN_IPV6].port != 0)
 778                 {
 779                         lrb_assert(listeners[LISTEN_IPV6].F == NULL);
 780
 781                         /* Pre-configured IP/port, just re-establish */
 782                         create_listener(listeners[LISTEN_IPV6].ip, listeners[LISTEN_IPV6].port);
 783                 }
 784         }
 785
 786         opm_enable = enable;
 787 }
 788
 789 static void
 790 set_opm_listener(const char *key __unused, int parc __unused, const char **parv)
 791 {
 792         const char *ip = parv[0];
 793         int iport = atoi(parv[1]);
 794
 795         if(iport > 65535 || iport <= 0)
 796         {
 797                 warn_opers(L_CRIT, "OPM: got a bad listener: %s:%s", parv[0], parv[1]);
 798                 exit(EX_PROVIDER_ERROR);
 799         }
 800
 801         create_listener(ip, (uint16_t)iport);
 802 }
 803
 804 static void
 805 create_opm_scanner(const char *key __unused, int parc __unused, const char **parv)
 806 {
 807         int iport = atoi(parv[1]);
 808         struct opm_proxy *proxy = rb_malloc(sizeof(struct opm_proxy));
 809
 810         if(iport <= 0 || iport > 65535)
 811         {
 812                 warn_opers(L_CRIT, "OPM: got a bad scanner: %s (port %s)", parv[0], parv[1]);
 813                 exit(EX_PROVIDER_ERROR);
 814         }
 815
 816         proxy->port = (uint16_t)iport;
 817
 818         switch((proxy->proto = get_protocol_from_string(parv[0])))
 819         {
 820         case PROTO_SOCKS4:
 821                 snprintf(proxy->note, sizeof(proxy->note), "socks4:%hu", proxy->port);
 822                 proxy->ssl = false;
 823                 break;
 824         case PROTO_SOCKS5:
 825                 snprintf(proxy->note, sizeof(proxy->note), "socks5:%hu", proxy->port);
 826                 proxy->ssl = false;
 827                 break;
 828         case PROTO_HTTP_CONNECT:
 829                 snprintf(proxy->note, sizeof(proxy->note), "httpconnect:%hu", proxy->port);
 830                 proxy->ssl = false;
 831                 break;
 832         case PROTO_HTTPS_CONNECT:
 833                 snprintf(proxy->note, sizeof(proxy->note), "httpsconnect:%hu", proxy->port);
 834                 proxy->ssl = true;
 835                 break;
 836         default:
 837                 warn_opers(L_CRIT, "OPM: got an unknown proxy type: %s (port %hu)", parv[0], proxy->port);
 838                 exit(EX_PROVIDER_ERROR);
 839         }
 840
 841         if(find_proxy_scanner(proxy->proto, proxy->port) != NULL)
 842         {
 843                 warn_opers(L_CRIT, "OPM: got a duplicate scanner: %s (port %hu)", parv[0], proxy->port);
 844                 exit(EX_PROVIDER_ERROR);
 845         }
 846
 847         rb_dlinkAdd(proxy, &proxy->node, &proxy_scanners);
 848 }
 849
 850 static void
 851 delete_opm_scanner(const char *key __unused, int parc __unused, const char **parv)
 852 {
 853         struct auth_client *auth;
 854         struct opm_proxy *proxy;
 855         protocol_t proto = get_protocol_from_string(parv[0]);
 856         int iport = atoi(parv[1]);
 857         rb_dictionary_iter iter;
 858
 859         if(iport <= 0 || iport > 65535)
 860         {
 861                 warn_opers(L_CRIT, "OPM: got a bad scanner to delete: %s (port %s)", parv[0], parv[1]);
 862                 exit(EX_PROVIDER_ERROR);
 863         }
 864
 865         if(proto == PROTO_NONE)
 866         {
 867                 warn_opers(L_CRIT, "OPM: got an unknown proxy type to delete: %s (port %d)", parv[0], iport);
 868                 exit(EX_PROVIDER_ERROR);
 869         }
 870
 871         if((proxy = find_proxy_scanner(proto, (uint16_t)iport)) == NULL)
 872         {
 873                 warn_opers(L_CRIT, "OPM: cannot find proxy to delete: %s (port %d)", parv[0], iport);
 874                 exit(EX_PROVIDER_ERROR);
 875         }
 876
 877         /* Abort remaining clients on this scanner */
 878         RB_DICTIONARY_FOREACH(auth, &iter, auth_clients)
 879         {
 880                 rb_dlink_node *ptr;
 881                 struct opm_lookup *lookup = get_provider_data(auth, SELF_PID);
 882
 883                 if(lookup == NULL)
 884                         continue;
 885
 886                 RB_DLINK_FOREACH(ptr, lookup->scans.head)
 887                 {
 888                         struct opm_scan *scan = ptr->data;
 889
 890                         if(scan->proxy->port == proxy->port && scan->proxy->proto == proxy->proto)
 891                         {
 892                                 /* Match */
 893                                 rb_dlinkDelete(&scan->node, &lookup->scans);
 894                                 rb_free(scan);
 895
 896                                 if(rb_dlink_list_length(&lookup->scans) == 0)
 897                                         opm_cancel(auth);
 898
 899                                 break;
 900                         }
 901                 }
 902         }
 903
 904         rb_dlinkDelete(&proxy->node, &proxy_scanners);
 905         rb_free(proxy);
 906
 907         if(rb_dlink_list_length(&proxy_scanners) == 0)
 908                 opm_enable = false;
 909 }
 910
 911 static void
 912 delete_opm_scanner_all(const char *key __unused, int parc __unused, const char **parv __unused)
 913 {
 914         struct auth_client *auth;
 915         rb_dlink_node *ptr, *nptr;
 916         rb_dictionary_iter iter;
 917
 918         RB_DLINK_FOREACH_SAFE(ptr, nptr, proxy_scanners.head)
 919         {
 920                 rb_free(ptr->data);
 921                 rb_dlinkDelete(ptr, &proxy_scanners);
 922         }
 923
 924         RB_DICTIONARY_FOREACH(auth, &iter, auth_clients)
 925         {
 926                 opm_cancel(auth);
 927         }
 928
 929         opm_enable = false;
 930 }
 931
 932
 933 struct auth_opts_handler opm_options[] =
 934 {
 935         { "opm_timeout", 1, add_conf_opm_timeout },
 936         { "opm_enabled", 1, set_opm_enabled },
 937         { "opm_listener", 2, set_opm_listener },
 938         { "opm_scanner", 2, create_opm_scanner },
 939         { "opm_scanner_del", 2, delete_opm_scanner },
 940         { "opm_scanner_del_all", 0, delete_opm_scanner_all },
 941         { NULL, 0, NULL },
 942 };
 943
 944 struct auth_provider opm_provider =
 945 {
 946         .name = "opm",
 947         .letter = 'O',
 948         .destroy = opm_destroy,
 949         .start = opm_start,
 950         .cancel = opm_cancel,
 951         .timeout = opm_cancel,
 952         .completed = opm_initiate,
 953         .opt_handlers = opm_options,
 954 };