citadel/modules/openid/serv_openid_rp.c

   1 /*
   2  * This is an implementation of OpenID 1.1 Relying Party support, in stateless mode.
   3  *
   4  * Copyright (c) 2007-2010 by the citadel.org 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 3 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "sysdep.h"
  22 #include <stdlib.h>
  23 #include <unistd.h>
  24 #include <stdio.h>
  25 #include <fcntl.h>
  26 #include <signal.h>
  27 #include <pwd.h>
  28 #include <errno.h>
  29 #include <sys/types.h>
  30
  31 #if TIME_WITH_SYS_TIME
  32 # include <sys/time.h>
  33 # include <time.h>
  34 #else
  35 # if HAVE_SYS_TIME_H
  36 #  include <sys/time.h>
  37 # else
  38 #  include <time.h>
  39 # endif
  40 #endif
  41
  42 #include <sys/wait.h>
  43 #include <string.h>
  44 #include <limits.h>
  45 #include <curl/curl.h>
  46 #include "ctdl_module.h"
  47 #include "config.h"
  48 #include "citserver.h"
  49 #include "user_ops.h"
  50
  51 typedef struct _ctdl_openid {
  52         StrBuf *claimed_id;
  53         StrBuf *server;
  54         int verified;
  55         HashList *sreg_keys;
  56 } ctdl_openid;
  57
  58 void Free_ctdl_openid(ctdl_openid **FreeMe)
  59 {
  60         if (*FreeMe == NULL)
  61                 return;
  62         FreeStrBuf(&(*FreeMe)->claimed_id);
  63         FreeStrBuf(&(*FreeMe)->server);
  64         DeleteHash(&(*FreeMe)->sreg_keys);
  65         free(*FreeMe);
  66         *FreeMe = NULL;
  67 }
  68
  69
  70 /*
  71  * This cleanup function blows away the temporary memory used by this module.
  72  */
  73 void openid_cleanup_function(void) {
  74         struct CitContext *CCC = CC;    /* CachedCitContext - performance boost */
  75
  76         if (CCC->openid_data != NULL) {
  77                 syslog(LOG_DEBUG, "Clearing OpenID session state\n");
  78                 Free_ctdl_openid((ctdl_openid **) &CCC->openid_data);
  79         }
  80 }
  81
  82
  83 /**************************************************************************/
  84 /*                                                                        */
  85 /* Functions in this section handle Citadel internal OpenID mapping stuff */
  86 /*                                                                        */
  87 /**************************************************************************/
  88
  89
  90 /*
  91  * The structure of an openid record *key* is:
  92  *
  93  * |--------------claimed_id-------------|
  94  *     (actual length of claimed id)
  95  *
  96  *
  97  * The structure of an openid record *value* is:
  98  *
  99  * |-----user_number----|------------claimed_id---------------|
 100  *    (sizeof long)          (actual length of claimed id)
 101  *
 102  */
 103
 104
 105
 106 /*
 107  * Attach an OpenID to a Citadel account
 108  */
 109 int attach_openid(struct ctdluser *who, StrBuf *claimed_id)
 110 {
 111         struct cdbdata *cdboi;
 112         long fetched_usernum;
 113         char *data;
 114         int data_len;
 115         char buf[2048];
 116
 117         if (!who) return(1);
 118         if (StrLength(claimed_id)==0) return(1);
 119
 120         /* Check to see if this OpenID is already in the database */
 121
 122         cdboi = cdb_fetch(CDB_OPENID, ChrPtr(claimed_id), StrLength(claimed_id));
 123         if (cdboi != NULL) {
 124                 memcpy(&fetched_usernum, cdboi->ptr, sizeof(long));
 125                 cdb_free(cdboi);
 126
 127                 if (fetched_usernum == who->usernum) {
 128                         syslog(LOG_INFO, "%s already associated; no action is taken\n", ChrPtr(claimed_id));
 129                         return(0);
 130                 }
 131                 else {
 132                         syslog(LOG_INFO, "%s already belongs to another user\n", ChrPtr(claimed_id));
 133                         return(3);
 134                 }
 135         }
 136
 137         /* Not already in the database, so attach it now */
 138
 139         data_len = sizeof(long) + StrLength(claimed_id) + 1;
 140         data = malloc(data_len);
 141
 142         memcpy(data, &who->usernum, sizeof(long));
 143         memcpy(&data[sizeof(long)], ChrPtr(claimed_id), StrLength(claimed_id) + 1);
 144
 145         cdb_store(CDB_OPENID, ChrPtr(claimed_id), StrLength(claimed_id), data, data_len);
 146         free(data);
 147
 148         snprintf(buf, sizeof buf, "User <%s> (#%ld) has claimed the OpenID URL %s\n",
 149                  who->fullname, who->usernum, ChrPtr(claimed_id));
 150         CtdlAideMessage(buf, "OpenID claim");
 151         syslog(LOG_INFO, "%s", buf);
 152         return(0);
 153 }
 154
 155
 156
 157 /*
 158  * When a user is being deleted, we have to delete any OpenID associations
 159  */
 160 void openid_purge(struct ctdluser *usbuf) {
 161         struct cdbdata *cdboi;
 162         HashList *keys = NULL;
 163         HashPos *HashPos;
 164         char *deleteme = NULL;
 165         long len;
 166         void *Value;
 167         const char *Key;
 168         long usernum = 0L;
 169
 170         keys = NewHash(1, NULL);
 171         if (!keys) return;
 172
 173
 174         cdb_rewind(CDB_OPENID);
 175         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 176                 if (cdboi->len > sizeof(long)) {
 177                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 178                         if (usernum == usbuf->usernum) {
 179                                 deleteme = strdup(cdboi->ptr + sizeof(long)),
 180                                 Put(keys, deleteme, strlen(deleteme), deleteme, NULL);
 181                         }
 182                 }
 183                 cdb_free(cdboi);
 184         }
 185
 186         /* Go through the hash list, deleting keys we stored in it */
 187
 188         HashPos = GetNewHashPos(keys, 0);
 189         while (GetNextHashPos(keys, HashPos, &len, &Key, &Value)!=0)
 190         {
 191                 syslog(LOG_DEBUG, "Deleting associated OpenID <%s>\n", (char*)Value);
 192                 cdb_delete(CDB_OPENID, Value, strlen(Value));
 193                 /* note: don't free(Value) -- deleting the hash list will handle this for us */
 194         }
 195         DeleteHashPos(&HashPos);
 196         DeleteHash(&keys);
 197 }
 198
 199
 200
 201 /*
 202  * List the OpenIDs associated with the currently logged in account
 203  */
 204 void cmd_oidl(char *argbuf) {
 205         struct cdbdata *cdboi;
 206         long usernum = 0L;
 207
 208         if (CtdlAccessCheck(ac_logged_in)) return;
 209         cdb_rewind(CDB_OPENID);
 210         cprintf("%d Associated OpenIDs:\n", LISTING_FOLLOWS);
 211
 212         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 213                 if (cdboi->len > sizeof(long)) {
 214                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 215                         if (usernum == CC->user.usernum) {
 216                                 cprintf("%s\n", cdboi->ptr + sizeof(long));
 217                         }
 218                 }
 219                 cdb_free(cdboi);
 220         }
 221         cprintf("000\n");
 222 }
 223
 224
 225 /*
 226  * List ALL OpenIDs in the database
 227  */
 228 void cmd_oida(char *argbuf) {
 229         struct cdbdata *cdboi;
 230         long usernum;
 231         struct ctdluser usbuf;
 232
 233         if (CtdlAccessCheck(ac_aide)) return;
 234         cdb_rewind(CDB_OPENID);
 235         cprintf("%d List of all OpenIDs in the database:\n", LISTING_FOLLOWS);
 236
 237         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 238                 if (cdboi->len > sizeof(long)) {
 239                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 240                         if (CtdlGetUserByNumber(&usbuf, usernum) != 0) {
 241                                 usbuf.fullname[0] = 0;
 242                         }
 243                         cprintf("%s|%ld|%s\n",
 244                                 cdboi->ptr + sizeof(long),
 245                                 usernum,
 246                                 usbuf.fullname
 247                         );
 248                 }
 249                 cdb_free(cdboi);
 250         }
 251         cprintf("000\n");
 252 }
 253
 254
 255 /*
 256  * Attempt to register (populate the vCard) the currently-logged-in user
 257  * using the data from Simple Registration Extension, if present.
 258  */
 259 void populate_vcard_from_sreg(HashList *sreg_keys) {
 260
 261         struct vCard *v;
 262         int pop = 0;                    /* number of fields populated */
 263         char *data = NULL;
 264         char *postcode = NULL;
 265         char *country = NULL;
 266
 267         if (!sreg_keys) return;
 268         v = vcard_new();
 269         if (!v) return;
 270
 271         if (GetHash(sreg_keys, "identity", 8, (void *) &data)) {
 272                 vcard_add_prop(v, "url;type=openid", data);
 273                 ++pop;
 274         }
 275
 276         if (GetHash(sreg_keys, "sreg.email", 10, (void *) &data)) {
 277                 vcard_add_prop(v, "email;internet", data);
 278                 ++pop;
 279         }
 280
 281         if (GetHash(sreg_keys, "sreg.nickname", 13, (void *) &data)) {
 282                 vcard_add_prop(v, "nickname", data);
 283                 ++pop;
 284         }
 285
 286         if (GetHash(sreg_keys, "sreg.fullname", 13, (void *) &data)) {
 287                 char n[256];
 288                 vcard_add_prop(v, "fn", data);
 289                 vcard_fn_to_n(n, data, sizeof n);
 290                 vcard_add_prop(v, "n", n);
 291                 ++pop;
 292         }
 293
 294         if (!GetHash(sreg_keys, "sreg.postcode", 13, (void *) &postcode)) {
 295                 postcode = NULL;
 296         }
 297
 298         if (!GetHash(sreg_keys, "sreg.country", 12, (void *) &country)) {
 299                 country = NULL;
 300         }
 301
 302         if (postcode || country) {
 303                 char adr[256];
 304                 snprintf(adr, sizeof adr, ";;;;;%s;%s",
 305                         (postcode ? postcode : ""),
 306                         (country ? country : "")
 307                 );
 308                 vcard_add_prop(v, "adr", adr);
 309                 ++pop;
 310         }
 311
 312         if (GetHash(sreg_keys, "sreg.dob", 8, (void *) &data)) {
 313                 vcard_add_prop(v, "bday", data);
 314                 ++pop;
 315         }
 316
 317         if (GetHash(sreg_keys, "sreg.gender", 11, (void *) &data)) {
 318                 vcard_add_prop(v, "x-funambol-gender", data);
 319                 ++pop;
 320         }
 321
 322         /* Only save the vCard if there is some useful data in it */
 323         if (pop > 0) {
 324                 char *ser;
 325                 ser = vcard_serialize(v);
 326                 if (ser) {
 327                         CtdlWriteObject(USERCONFIGROOM, "text/x-vcard",
 328                                 ser, strlen(ser)+1, &CC->user, 0, 0, 0
 329                         );
 330                         free(ser);
 331                 }
 332         }
 333         vcard_free(v);
 334 }
 335
 336
 337 /*
 338  * Create a new user account, manually specifying the name, after successfully
 339  * verifying an OpenID (which will of course be attached to the account)
 340  */
 341 void cmd_oidc(char *argbuf) {
 342         ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
 343
 344         if (!oiddata) {
 345                 cprintf("%d You have not verified an OpenID yet.\n", ERROR);
 346                 return;
 347         }
 348
 349         if (!oiddata->verified) {
 350                 cprintf("%d You have not verified an OpenID yet.\n", ERROR);
 351                 return;
 352         }
 353
 354         /* We can make the semantics of OIDC exactly the same as NEWU, simply
 355          * by _calling_ cmd_newu() and letting it run.  Very clever!
 356          */
 357         cmd_newu(argbuf);
 358
 359         /* Now, if this logged us in, we have to attach the OpenID */
 360         if (CC->logged_in) {
 361                 attach_openid(&CC->user, oiddata->claimed_id);
 362                 if (oiddata->sreg_keys != NULL) {
 363                         populate_vcard_from_sreg(oiddata->sreg_keys);
 364                 }
 365         }
 366
 367 }
 368
 369
 370
 371
 372 /*
 373  * Detach an OpenID from the currently logged in account
 374  */
 375 void cmd_oidd(char *argbuf) {
 376         struct cdbdata *cdboi;
 377         char id_to_detach[1024];
 378         int this_is_mine = 0;
 379         long usernum = 0L;
 380
 381         if (CtdlAccessCheck(ac_logged_in)) return;
 382         extract_token(id_to_detach, argbuf, 0, '|', sizeof id_to_detach);
 383         if (IsEmptyStr(id_to_detach)) {
 384                 cprintf("%d An empty OpenID URL is not allowed.\n", ERROR + ILLEGAL_VALUE);
 385         }
 386
 387         cdb_rewind(CDB_OPENID);
 388         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 389                 if (cdboi->len > sizeof(long)) {
 390                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 391                         if (usernum == CC->user.usernum) {
 392                                 this_is_mine = 1;
 393                         }
 394                 }
 395                 cdb_free(cdboi);
 396         }
 397
 398         if (!this_is_mine) {
 399                 cprintf("%d That OpenID was not found or not associated with your account.\n",
 400                         ERROR + ILLEGAL_VALUE);
 401                 return;
 402         }
 403
 404         cdb_delete(CDB_OPENID, id_to_detach, strlen(id_to_detach));
 405         cprintf("%d %s detached from your account.\n", CIT_OK, id_to_detach);
 406 }
 407
 408
 409
 410 /*
 411  * Attempt to auto-create a new Citadel account using the nickname from Simple Registration Extension
 412  */
 413 int openid_create_user_via_sreg(StrBuf *claimed_id, HashList *sreg_keys)
 414 {
 415         char *desired_name = NULL;
 416         char new_password[32];
 417         long len;
 418
 419         if (config.c_auth_mode != AUTHMODE_NATIVE) return(1);
 420         if (config.c_disable_newu) return(2);
 421         if (CC->logged_in) return(3);
 422         if (!GetHash(sreg_keys, "sreg.nickname", 13, (void *) &desired_name)) return(4);
 423
 424         syslog(LOG_DEBUG, "The desired account name is <%s>\n", desired_name);
 425
 426         len = cutuserkey(desired_name);
 427         if (!CtdlGetUser(&CC->user, desired_name)) {
 428                 syslog(LOG_DEBUG, "<%s> is already taken by another user.\n", desired_name);
 429                 memset(&CC->user, 0, sizeof(struct ctdluser));
 430                 return(5);
 431         }
 432
 433         /* The desired account name is available.  Create the account and log it in! */
 434         if (create_user(desired_name, len, 1)) return(6);
 435
 436         snprintf(new_password, sizeof new_password, "%08lx%08lx", random(), random());
 437         CtdlSetPassword(new_password);
 438         attach_openid(&CC->user, claimed_id);
 439         populate_vcard_from_sreg(sreg_keys);
 440         return(0);
 441 }
 442
 443
 444 /*
 445  * If a user account exists which is associated with the Claimed ID, log it in and return zero.
 446  * Otherwise it returns nonzero.
 447  */
 448 int login_via_openid(StrBuf *claimed_id)
 449 {
 450         struct cdbdata *cdboi;
 451         long usernum = 0;
 452
 453         cdboi = cdb_fetch(CDB_OPENID, ChrPtr(claimed_id), StrLength(claimed_id));
 454         if (cdboi == NULL) {
 455                 return(-1);
 456         }
 457
 458         memcpy(&usernum, cdboi->ptr, sizeof(long));
 459         cdb_free(cdboi);
 460
 461         if (!CtdlGetUserByNumber(&CC->user, usernum)) {
 462                 /* Now become the user we just created */
 463                 safestrncpy(CC->curr_user, CC->user.fullname, sizeof CC->curr_user);
 464                 do_login();
 465                 return(0);
 466         }
 467         else {
 468                 memset(&CC->user, 0, sizeof(struct ctdluser));
 469                 return(-1);
 470         }
 471 }
 472
 473
 474
 475
 476 /**************************************************************************/
 477 /*                                                                        */
 478 /* Functions in this section handle OpenID protocol                       */
 479 /*                                                                        */
 480 /**************************************************************************/
 481
 482
 483 /*
 484  * Locate a <link> tag and, given its 'rel=' parameter, return its 'href' parameter
 485  */
 486 void extract_link(StrBuf *target_buf, const char *rel, long repllen, StrBuf *source_buf)
 487 {
 488         int i;
 489         const char *ptr;
 490         const char *href_start = NULL;
 491         const char *href_end = NULL;
 492         const char *link_tag_start = NULL;
 493         const char *link_tag_end = NULL;
 494         const char *rel_start = NULL;
 495         const char *rel_end = NULL;
 496
 497         if (!target_buf) return;
 498         if (!rel) return;
 499         if (!source_buf) return;
 500
 501         ptr = ChrPtr(source_buf);
 502
 503         FlushStrBuf(target_buf);
 504         while (ptr = cbmstrcasestr(ptr, "<link"), ptr != NULL) {
 505
 506                 link_tag_start = ptr;
 507                 link_tag_end = strchr(ptr, '>');
 508                 if (link_tag_end == NULL)
 509                         break;
 510                 for (i=0; i < 1; i++ ){
 511                         rel_start = cbmstrcasestr(link_tag_start, "rel=");
 512                         if ((rel_start == NULL) ||
 513                             (rel_start > link_tag_end))
 514                                 continue;
 515
 516                         rel_start = strchr(rel_start, '\"');
 517                         if ((rel_start == NULL) ||
 518                             (rel_start > link_tag_end))
 519                                 continue;
 520                         ++rel_start;
 521                         rel_end = strchr(rel_start, '\"');
 522                         if ((rel_end == NULL) ||
 523                             (rel_end == rel_start) ||
 524                             (rel_end >= link_tag_end) )
 525                                 continue;
 526                         if (strncasecmp(rel, rel_start, repllen)!= 0)
 527                                 continue; /* didn't match? never mind... */
 528
 529                         href_start = cbmstrcasestr(link_tag_start, "href=");
 530                         if ((href_start == NULL) ||
 531                             (href_start >= link_tag_end))
 532                                 continue;
 533                         href_start = strchr(href_start, '\"');
 534                         if ((href_start == NULL) |
 535                             (href_start >= link_tag_end))
 536                                 continue;
 537                         ++href_start;
 538                         href_end = strchr(href_start, '\"');
 539                         if ((href_end == NULL) ||
 540                             (href_end == href_start) ||
 541                             (href_start >= link_tag_end))
 542                                 continue;
 543                         StrBufPlain(target_buf, href_start, href_end - href_start);
 544                 }
 545                 ptr = link_tag_end;
 546         }
 547 }
 548
 549
 550 /*
 551  * Begin an HTTP fetch (returns number of bytes actually fetched, or -1 for error) using libcurl.
 552  *
 553  * If 'normalize_len' is nonzero, the caller is specifying the buffer size of 'url', and is
 554  * requesting that the effective (normalized) URL be copied back to it.
 555  */
 556 int fetch_http(StrBuf *url, StrBuf **target_buf)
 557 {
 558         StrBuf *ReplyBuf;
 559         CURL *curl;
 560         CURLcode res;
 561         char errmsg[1024] = "";
 562         char *effective_url = NULL;
 563
 564         if (StrLength(url) <=0 ) return(-1);
 565         ReplyBuf = *target_buf = NewStrBuf ();
 566         if (ReplyBuf == 0) return(-1);
 567
 568         curl = curl_easy_init();
 569         if (!curl) {
 570                 syslog(LOG_ALERT, "Unable to initialize libcurl.\n");
 571                 return(-1);
 572         }
 573
 574         curl_easy_setopt(curl, CURLOPT_URL, ChrPtr(url));
 575         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 576         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 577
 578         curl_easy_setopt(curl, CURLOPT_WRITEDATA, ReplyBuf);
 579         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, CurlFillStrBuf_callback);
 580
 581         curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
 582         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 583 #ifdef CURLOPT_HTTP_CONTENT_DECODING
 584         curl_easy_setopt(curl, CURLOPT_HTTP_CONTENT_DECODING, 1);
 585         curl_easy_setopt(curl, CURLOPT_ENCODING, "");
 586 #endif
 587         curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
 588         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 180);           /* die after 180 seconds */
 589         if (
 590                 (!IsEmptyStr(config.c_ip_addr))
 591                 && (strcmp(config.c_ip_addr, "*"))
 592                 && (strcmp(config.c_ip_addr, "::"))
 593                 && (strcmp(config.c_ip_addr, "0.0.0.0"))
 594         ) {
 595                 curl_easy_setopt(curl, CURLOPT_INTERFACE, config.c_ip_addr);
 596         }
 597         res = curl_easy_perform(curl);
 598         if (res) {
 599                 syslog(LOG_DEBUG, "fetch_http() libcurl error %d: %s\n", res, errmsg);
 600         }
 601         curl_easy_getinfo(curl, CURLINFO_EFFECTIVE_URL, &effective_url);
 602         StrBufPlain(url, effective_url, -1);
 603
 604         curl_easy_cleanup(curl);
 605         return StrLength(ReplyBuf);
 606 }
 607
 608
 609 /*
 610  * Setup an OpenID authentication
 611  */
 612 void cmd_oids(char *argbuf) {
 613         const char *Pos = NULL;
 614         StrBuf *ArgBuf = NULL;
 615         StrBuf *ReplyBuf = NULL;
 616         StrBuf *return_to = NULL;
 617         StrBuf *trust_root = NULL;
 618         StrBuf *openid_delegate = NULL;
 619         StrBuf *RedirectUrl = NULL;
 620         int i;
 621         struct CitContext *CCC = CC;    /* CachedCitContext - performance boost */
 622         ctdl_openid *oiddata;
 623
 624         Free_ctdl_openid ((ctdl_openid**)&CCC->openid_data);
 625
 626         CCC->openid_data = oiddata = malloc(sizeof(ctdl_openid));
 627         if (oiddata == NULL) {
 628                 cprintf("%d malloc failed\n", ERROR + INTERNAL_ERROR);
 629                 return;
 630         }
 631         memset(oiddata, 0, sizeof(ctdl_openid));
 632         CCC->openid_data = (void *) oiddata;
 633
 634         ArgBuf = NewStrBufPlain(argbuf, -1);
 635
 636         oiddata->claimed_id = NewStrBufPlain(NULL, StrLength(ArgBuf));
 637         trust_root = NewStrBufPlain(NULL, StrLength(ArgBuf));
 638         return_to = NewStrBufPlain(NULL, StrLength(ArgBuf));
 639
 640         StrBufExtract_NextToken(oiddata->claimed_id, ArgBuf, &Pos, '|');
 641         StrBufExtract_NextToken(return_to, ArgBuf, &Pos, '|');
 642         StrBufExtract_NextToken(trust_root, ArgBuf, &Pos, '|');
 643
 644         oiddata->verified = 0;
 645
 646         i = fetch_http(oiddata->claimed_id, &ReplyBuf);
 647         syslog(LOG_DEBUG, "Normalized URL and Claimed ID is: %s\n",
 648                       ChrPtr(oiddata->claimed_id));
 649         if ((StrLength(ReplyBuf) > 0) && (i > 0)) {
 650
 651                 openid_delegate = NewStrBuf();
 652                 oiddata->server = NewStrBuf();
 653                 extract_link(oiddata->server, HKEY("openid.server"), ReplyBuf);
 654                 extract_link(openid_delegate, HKEY("openid.delegate"), ReplyBuf);
 655
 656                 if (StrLength(oiddata->server) == 0) {
 657                         cprintf("%d There is no OpenID identity provider at this URL.\n", ERROR);
 658                         FreeStrBuf(&ArgBuf);
 659                         FreeStrBuf(&ReplyBuf);
 660                         FreeStrBuf(&return_to);
 661                         FreeStrBuf(&trust_root);
 662                         FreeStrBuf(&openid_delegate);
 663                         FreeStrBuf(&RedirectUrl);
 664                         return;
 665                 }
 666
 667                 /* Empty delegate is legal; we just use the openid_url instead */
 668                 if (StrLength(openid_delegate) == 0) {
 669                         StrBufPlain(openid_delegate, SKEY(oiddata->claimed_id));
 670                 }
 671
 672                 /* Assemble a URL to which the user-agent will be redirected. */
 673
 674                 RedirectUrl = NewStrBufDup(oiddata->server);
 675
 676                 StrBufAppendBufPlain(RedirectUrl, HKEY("?openid.mode=checkid_setup"
 677                                                        "&openid.identity="), 0);
 678                 StrBufUrlescAppend(RedirectUrl, openid_delegate, NULL);
 679
 680                 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.return_to="), 0);
 681                 StrBufUrlescAppend(RedirectUrl, return_to, NULL);
 682
 683                 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.trust_root="), 0);
 684                 StrBufUrlescAppend(RedirectUrl, trust_root, NULL);
 685
 686                 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.sreg.optional="), 0);
 687                 StrBufUrlescAppend(RedirectUrl, NULL, "nickname,email,fullname,postcode,country,dob,gender");
 688
 689                 cprintf("%d %s\n", CIT_OK, ChrPtr(RedirectUrl));
 690
 691                 FreeStrBuf(&ArgBuf);
 692                 FreeStrBuf(&ReplyBuf);
 693                 FreeStrBuf(&return_to);
 694                 FreeStrBuf(&trust_root);
 695                 FreeStrBuf(&openid_delegate);
 696                 FreeStrBuf(&RedirectUrl);
 697
 698                 return;
 699         }
 700         FreeStrBuf(&ArgBuf);
 701         FreeStrBuf(&ReplyBuf);
 702         FreeStrBuf(&return_to);
 703         FreeStrBuf(&trust_root);
 704         FreeStrBuf(&openid_delegate);
 705         FreeStrBuf(&RedirectUrl);
 706
 707         cprintf("%d Unable to fetch OpenID URL\n", ERROR);
 708 }
 709
 710
 711
 712
 713
 714 /*
 715  * Finalize an OpenID authentication
 716  */
 717 void cmd_oidf(char *argbuf) {
 718         long len;
 719         char buf[2048];
 720         char thiskey[1024];
 721         char thisdata[1024];
 722         HashList *keys = NULL;
 723         ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
 724
 725         if (oiddata == NULL) {
 726                 cprintf("%d run OIDS first.\n", ERROR + INTERNAL_ERROR);
 727                 return;
 728         }
 729         if (StrLength(oiddata->server) == 0){
 730                 cprintf("%d need a remote server to authenticate against\n", ERROR + ILLEGAL_VALUE);
 731                 return;
 732         }
 733         keys = NewHash(1, NULL);
 734         if (!keys) {
 735                 cprintf("%d NewHash() failed\n", ERROR + INTERNAL_ERROR);
 736                 return;
 737         }
 738         cprintf("%d Transmit OpenID data now\n", START_CHAT_MODE);
 739
 740         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 741                 len = extract_token(thiskey, buf, 0, '|', sizeof thiskey);
 742                 if (len < 0)
 743                         len = sizeof(thiskey) - 1;
 744                 extract_token(thisdata, buf, 1, '|', sizeof thisdata);
 745                 syslog(LOG_DEBUG, "%s: ["SIZE_T_FMT"] %s\n", thiskey, strlen(thisdata), thisdata);
 746                 Put(keys, thiskey, len, strdup(thisdata), NULL);
 747         }
 748
 749
 750         /* Now that we have all of the parameters, we have to validate the signature against the server */
 751         syslog(LOG_DEBUG, "About to validate the signature...\n");
 752
 753         CURL *curl;
 754         CURLcode res;
 755         struct curl_httppost *formpost = NULL;
 756         struct curl_httppost *lastptr = NULL;
 757         char errmsg[1024] = "";
 758         char *o_assoc_handle = NULL;
 759         char *o_sig = NULL;
 760         char *o_signed = NULL;
 761         int num_signed_values;
 762         int i;
 763         char k_keyname[128];
 764         char k_o_keyname[128];
 765         char *k_value = NULL;
 766         StrBuf *ReplyBuf;
 767
 768         curl_formadd(&formpost, &lastptr,
 769                 CURLFORM_COPYNAME,      "openid.mode",
 770                 CURLFORM_COPYCONTENTS,  "check_authentication",
 771                 CURLFORM_END);
 772         syslog(LOG_DEBUG, "%25s : %s\n", "openid.mode", "check_authentication");
 773
 774         if (GetHash(keys, "assoc_handle", 12, (void *) &o_assoc_handle)) {
 775                 curl_formadd(&formpost, &lastptr,
 776                         CURLFORM_COPYNAME,      "openid.assoc_handle",
 777                         CURLFORM_COPYCONTENTS,  o_assoc_handle,
 778                         CURLFORM_END);
 779                 syslog(LOG_DEBUG, "%25s : %s\n", "openid.assoc_handle", o_assoc_handle);
 780         }
 781
 782         if (GetHash(keys, "sig", 3, (void *) &o_sig)) {
 783                 curl_formadd(&formpost, &lastptr,
 784                         CURLFORM_COPYNAME,      "openid.sig",
 785                         CURLFORM_COPYCONTENTS,  o_sig,
 786                         CURLFORM_END);
 787                         syslog(LOG_DEBUG, "%25s : %s\n", "openid.sig", o_sig);
 788         }
 789
 790         if (GetHash(keys, "signed", 6, (void *) &o_signed)) {
 791                 curl_formadd(&formpost, &lastptr,
 792                         CURLFORM_COPYNAME,      "openid.signed",
 793                         CURLFORM_COPYCONTENTS,  o_signed,
 794                         CURLFORM_END);
 795                 syslog(LOG_DEBUG, "%25s : %s\n", "openid.signed", o_signed);
 796
 797                 num_signed_values = num_tokens(o_signed, ',');
 798                 for (i=0; i<num_signed_values; ++i) {
 799                         extract_token(k_keyname, o_signed, i, ',', sizeof k_keyname);
 800                         if (strcasecmp(k_keyname, "mode")) {    // work around phpMyID bug
 801                                 if (GetHash(keys, k_keyname, strlen(k_keyname), (void *) &k_value)) {
 802                                         snprintf(k_o_keyname, sizeof k_o_keyname, "openid.%s", k_keyname);
 803                                         curl_formadd(&formpost, &lastptr,
 804                                                 CURLFORM_COPYNAME,      k_o_keyname,
 805                                                 CURLFORM_COPYCONTENTS,  k_value,
 806                                                 CURLFORM_END);
 807                                         syslog(LOG_DEBUG, "%25s : %s\n", k_o_keyname, k_value);
 808                                 }
 809                                 else {
 810                                         syslog(LOG_INFO, "OpenID: signed field '%s' is missing\n",
 811                                                 k_keyname);
 812                                 }
 813                         }
 814                 }
 815         }
 816
 817         ReplyBuf = NewStrBuf();
 818
 819         curl = curl_easy_init();
 820         curl_easy_setopt(curl, CURLOPT_URL, ChrPtr(oiddata->server));
 821         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 822         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 823
 824         curl_easy_setopt(curl, CURLOPT_WRITEDATA, ReplyBuf);
 825         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, CurlFillStrBuf_callback);
 826         curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 827         curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
 828         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 829 #ifdef CURLOPT_HTTP_CONTENT_DECODING
 830         curl_easy_setopt(curl, CURLOPT_HTTP_CONTENT_DECODING, 1);
 831         curl_easy_setopt(curl, CURLOPT_ENCODING, "");
 832 #endif
 833         curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
 834         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 180);           /* die after 180 seconds */
 835         if (
 836                 (!IsEmptyStr(config.c_ip_addr))
 837                 && (strcmp(config.c_ip_addr, "*"))
 838                 && (strcmp(config.c_ip_addr, "::"))
 839                 && (strcmp(config.c_ip_addr, "0.0.0.0"))
 840         ) {
 841                 curl_easy_setopt(curl, CURLOPT_INTERFACE, config.c_ip_addr);
 842         }
 843
 844         res = curl_easy_perform(curl);
 845         if (res) {
 846                 syslog(LOG_DEBUG, "cmd_oidf() libcurl error %d: %s\n", res, errmsg);
 847         }
 848         curl_easy_cleanup(curl);
 849         curl_formfree(formpost);
 850
 851         if (cbmstrcasestr(ChrPtr(ReplyBuf), "is_valid:true")) {
 852                 oiddata->verified = 1;
 853         }
 854         FreeStrBuf(&ReplyBuf);
 855
 856         syslog(LOG_DEBUG, "Authentication %s.\n", (oiddata->verified ? "succeeded" : "failed") );
 857
 858         /* Respond to the client */
 859
 860         if (oiddata->verified) {
 861
 862                 /* If we were already logged in, attach the OpenID to the user's account */
 863                 if (CC->logged_in) {
 864                         if (attach_openid(&CC->user, oiddata->claimed_id) == 0) {
 865                                 cprintf("attach\n");
 866                                 syslog(LOG_DEBUG, "OpenID attach succeeded\n");
 867                         }
 868                         else {
 869                                 cprintf("fail\n");
 870                                 syslog(LOG_DEBUG, "OpenID attach failed\n");
 871                         }
 872                 }
 873
 874                 /* Otherwise, a user is attempting to log in using the verified OpenID */
 875                 else {
 876                         /*
 877                          * Existing user who has claimed this OpenID?
 878                          *
 879                          * Note: if you think that sending the password back over the wire is insecure,
 880                          * check your assumptions.  If someone has successfully asserted an OpenID that
 881                          * is associated with the account, they already have password equivalency and can
 882                          * login, so they could just as easily change the password, etc.
 883                          */
 884                         if (login_via_openid(oiddata->claimed_id) == 0) {
 885                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
 886                                 logged_in_response();
 887                                 syslog(LOG_DEBUG, "Logged in using previously claimed OpenID\n");
 888                         }
 889
 890                         /*
 891                          * If this system does not allow self-service new user registration, the
 892                          * remaining modes do not apply, so fail here and now.
 893                          */
 894                         else if (config.c_disable_newu) {
 895                                 cprintf("fail\n");
 896                                 syslog(LOG_DEBUG, "Creating user failed due to local policy\n");
 897                         }
 898
 899                         /*
 900                          * New user whose OpenID is verified and Simple Registration Extension is in use?
 901                          */
 902                         else if (openid_create_user_via_sreg(oiddata->claimed_id, keys) == 0) {
 903                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
 904                                 logged_in_response();
 905                                 syslog(LOG_DEBUG, "Successfully auto-created new user\n");
 906                         }
 907
 908                         /*
 909                          * OpenID is verified, but the desired username either was not specified or
 910                          * conflicts with an existing user.  Manual account creation is required.
 911                          */
 912                         else {
 913                                 char *desired_name = NULL;
 914                                 cprintf("verify_only\n");
 915                                 cprintf("%s\n", ChrPtr(oiddata->claimed_id));
 916                                 if (GetHash(keys, "sreg.nickname", 13, (void *) &desired_name)) {
 917                                         cprintf("%s\n", desired_name);
 918                                 }
 919                                 else {
 920                                         cprintf("\n");
 921                                 }
 922                                 syslog(LOG_DEBUG, "The desired Simple Registration name is already taken.\n");
 923                         }
 924                 }
 925         }
 926         else {
 927                 cprintf("fail\n");
 928         }
 929         cprintf("000\n");
 930
 931         if (oiddata->sreg_keys != NULL) {
 932                 DeleteHash(&oiddata->sreg_keys);
 933                 oiddata->sreg_keys = NULL;
 934         }
 935         oiddata->sreg_keys = keys;
 936 }
 937
 938
 939
 940 /**************************************************************************/
 941 /*                                                                        */
 942 /* Functions in this section handle module initialization and shutdown    */
 943 /*                                                                        */
 944 /**************************************************************************/
 945
 946
 947
 948
 949 CTDL_MODULE_INIT(openid_rp)
 950 {
 951         if (!threading) {
 952                 curl_global_init(CURL_GLOBAL_ALL);
 953
 954                 /* Only enable the OpenID command set when native mode authentication is in use. */
 955                 if (config.c_auth_mode == AUTHMODE_NATIVE) {
 956                         CtdlRegisterProtoHook(cmd_oids, "OIDS", "Setup OpenID authentication");
 957                         CtdlRegisterProtoHook(cmd_oidf, "OIDF", "Finalize OpenID authentication");
 958                         CtdlRegisterProtoHook(cmd_oidl, "OIDL", "List OpenIDs associated with an account");
 959                         CtdlRegisterProtoHook(cmd_oidd, "OIDD", "Detach an OpenID from an account");
 960                         CtdlRegisterProtoHook(cmd_oidc, "OIDC", "Create new user after validating OpenID");
 961                         CtdlRegisterProtoHook(cmd_oida, "OIDA", "List all OpenIDs in the database");
 962                 }
 963                 CtdlRegisterSessionHook(openid_cleanup_function, EVT_LOGOUT);
 964                 CtdlRegisterUserHook(openid_purge, EVT_PURGEUSER);
 965                 openid_level_supported = 1;     /* This module supports OpenID 1.0 only */
 966         }
 967
 968         /* return our module name for the log */
 969         return "openid_rp";
 970 }