citadel/modules/openid/serv_openid_rp.c

   1 /*
   2  * $Id$
   3  *
   4  * This is an implementation of OpenID 1.1 Relying Party support, in stateless mode.
   5  *
   6  * Copyright (c) 2007-2009 by the citadel.org team
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 3 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include "sysdep.h"
  24 #include <stdlib.h>
  25 #include <unistd.h>
  26 #include <stdio.h>
  27 #include <fcntl.h>
  28 #include <signal.h>
  29 #include <pwd.h>
  30 #include <errno.h>
  31 #include <sys/types.h>
  32
  33 #if TIME_WITH_SYS_TIME
  34 # include <sys/time.h>
  35 # include <time.h>
  36 #else
  37 # if HAVE_SYS_TIME_H
  38 #  include <sys/time.h>
  39 # else
  40 #  include <time.h>
  41 # endif
  42 #endif
  43
  44 #include <sys/wait.h>
  45 #include <string.h>
  46 #include <limits.h>
  47 #include <curl/curl.h>
  48 #include "ctdl_module.h"
  49 #include "config.h"
  50 #include "citserver.h"
  51 #include "user_ops.h"
  52
  53 typedef struct _ctdl_openid {
  54         StrBuf *claimed_id;
  55         StrBuf *server;
  56         int verified;
  57         HashList *sreg_keys;
  58 } ctdl_openid;
  59
  60 void Free_ctdl_openid(ctdl_openid **FreeMe)
  61 {
  62         if (*FreeMe == NULL)
  63                 return;
  64         FreeStrBuf(&(*FreeMe)->claimed_id);
  65         FreeStrBuf(&(*FreeMe)->server);
  66         DeleteHash(&(*FreeMe)->sreg_keys);
  67         free(*FreeMe);
  68         *FreeMe = NULL;
  69 }
  70
  71
  72 /*
  73  * This cleanup function blows away the temporary memory used by this module.
  74  */
  75 void openid_cleanup_function(void) {
  76         struct CitContext *CCC = CC;    /* CachedCitContext - performance boost */
  77
  78         if (CCC->openid_data != NULL) {
  79                 CtdlLogPrintf(CTDL_DEBUG, "Clearing OpenID session state\n");
  80                 Free_ctdl_openid((ctdl_openid **) &CCC->openid_data);
  81         }
  82 }
  83
  84
  85 /**************************************************************************/
  86 /*                                                                        */
  87 /* Functions in this section handle Citadel internal OpenID mapping stuff */
  88 /*                                                                        */
  89 /**************************************************************************/
  90
  91
  92 /*
  93  * The structure of an openid record *key* is:
  94  *
  95  * |--------------claimed_id-------------|
  96  *     (actual length of claimed id)
  97  *
  98  *
  99  * The structure of an openid record *value* is:
 100  *
 101  * |-----user_number----|------------claimed_id---------------|
 102  *    (sizeof long)          (actual length of claimed id)
 103  *
 104  */
 105
 106
 107
 108 /*
 109  * Attach an OpenID to a Citadel account
 110  */
 111 int attach_openid(struct ctdluser *who, StrBuf *claimed_id)
 112 {
 113         struct cdbdata *cdboi;
 114         long fetched_usernum;
 115         char *data;
 116         int data_len;
 117         char buf[2048];
 118
 119         if (!who) return(1);
 120         if (StrLength(claimed_id)==0) return(1);
 121
 122         /* Check to see if this OpenID is already in the database */
 123
 124         cdboi = cdb_fetch(CDB_OPENID, ChrPtr(claimed_id), StrLength(claimed_id));
 125         if (cdboi != NULL) {
 126                 memcpy(&fetched_usernum, cdboi->ptr, sizeof(long));
 127                 cdb_free(cdboi);
 128
 129                 if (fetched_usernum == who->usernum) {
 130                         CtdlLogPrintf(CTDL_INFO, "%s already associated; no action is taken\n", claimed_id);
 131                         return(0);
 132                 }
 133                 else {
 134                         CtdlLogPrintf(CTDL_INFO, "%s already belongs to another user\n", claimed_id);
 135                         return(3);
 136                 }
 137         }
 138
 139         /* Not already in the database, so attach it now */
 140
 141         data_len = sizeof(long) + StrLength(claimed_id) + 1;
 142         data = malloc(data_len);
 143
 144         memcpy(data, &who->usernum, sizeof(long));
 145         memcpy(&data[sizeof(long)], ChrPtr(claimed_id), StrLength(claimed_id) + 1);
 146
 147         cdb_store(CDB_OPENID, ChrPtr(claimed_id), StrLength(claimed_id), data, data_len);
 148         free(data);
 149
 150         snprintf(buf, sizeof buf, "User <%s> (#%ld) has claimed the OpenID URL %s\n",
 151                  who->fullname, who->usernum, ChrPtr(claimed_id));
 152         CtdlAideMessage(buf, "OpenID claim");
 153         CtdlLogPrintf(CTDL_INFO, "%s", buf);
 154         return(0);
 155 }
 156
 157
 158
 159 /*
 160  * When a user is being deleted, we have to delete any OpenID associations
 161  */
 162 void openid_purge(struct ctdluser *usbuf) {
 163         struct cdbdata *cdboi;
 164         HashList *keys = NULL;
 165         HashPos *HashPos;
 166         char *deleteme = NULL;
 167         long len;
 168         void *Value;
 169         const char *Key;
 170         long usernum = 0L;
 171
 172         keys = NewHash(1, NULL);
 173         if (!keys) return;
 174
 175
 176         cdb_rewind(CDB_OPENID);
 177         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 178                 if (cdboi->len > sizeof(long)) {
 179                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 180                         if (usernum == usbuf->usernum) {
 181                                 deleteme = strdup(cdboi->ptr + sizeof(long)),
 182                                 Put(keys, deleteme, strlen(deleteme), deleteme, NULL);
 183                         }
 184                 }
 185                 cdb_free(cdboi);
 186         }
 187
 188         /* Go through the hash list, deleting keys we stored in it */
 189
 190         HashPos = GetNewHashPos(keys, 0);
 191         while (GetNextHashPos(keys, HashPos, &len, &Key, &Value)!=0)
 192         {
 193                 CtdlLogPrintf(CTDL_DEBUG, "Deleting associated OpenID <%s>\n", Value);
 194                 cdb_delete(CDB_OPENID, Value, strlen(Value));
 195                 /* note: don't free(Value) -- deleting the hash list will handle this for us */
 196         }
 197         DeleteHashPos(&HashPos);
 198         DeleteHash(&keys);
 199 }
 200
 201
 202
 203 /*
 204  * List the OpenIDs associated with the currently logged in account
 205  */
 206 void cmd_oidl(char *argbuf) {
 207         struct cdbdata *cdboi;
 208         long usernum = 0L;
 209
 210         if (CtdlAccessCheck(ac_logged_in)) return;
 211         cdb_rewind(CDB_OPENID);
 212         cprintf("%d Associated OpenIDs:\n", LISTING_FOLLOWS);
 213
 214         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 215                 if (cdboi->len > sizeof(long)) {
 216                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 217                         if (usernum == CC->user.usernum) {
 218                                 cprintf("%s\n", cdboi->ptr + sizeof(long));
 219                         }
 220                 }
 221                 cdb_free(cdboi);
 222         }
 223         cprintf("000\n");
 224 }
 225
 226
 227 /*
 228  * List ALL OpenIDs in the database
 229  */
 230 void cmd_oida(char *argbuf) {
 231         struct cdbdata *cdboi;
 232         long usernum;
 233         struct ctdluser usbuf;
 234
 235         if (CtdlAccessCheck(ac_aide)) return;
 236         cdb_rewind(CDB_OPENID);
 237         cprintf("%d List of all OpenIDs in the database:\n", LISTING_FOLLOWS);
 238
 239         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 240                 if (cdboi->len > sizeof(long)) {
 241                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 242                         if (CtdlGetUserByNumber(&usbuf, usernum) != 0) {
 243                                 usbuf.fullname[0] = 0;
 244                         }
 245                         cprintf("%s|%ld|%s\n",
 246                                 cdboi->ptr + sizeof(long),
 247                                 usernum,
 248                                 usbuf.fullname
 249                         );
 250                 }
 251                 cdb_free(cdboi);
 252         }
 253         cprintf("000\n");
 254 }
 255
 256
 257 /*
 258  * Attempt to register (populate the vCard) the currently-logged-in user
 259  * using the data from Simple Registration Extension, if present.
 260  */
 261 void populate_vcard_from_sreg(HashList *sreg_keys) {
 262
 263         struct vCard *v;
 264         int pop = 0;                    /* number of fields populated */
 265         char *data = NULL;
 266         char *postcode = NULL;
 267         char *country = NULL;
 268
 269         if (!sreg_keys) return;
 270         v = vcard_new();
 271         if (!v) return;
 272
 273         if (GetHash(sreg_keys, "identity", 8, (void *) &data)) {
 274                 vcard_add_prop(v, "url;type=openid", data);
 275                 ++pop;
 276         }
 277
 278         if (GetHash(sreg_keys, "sreg.email", 10, (void *) &data)) {
 279                 vcard_add_prop(v, "email;internet", data);
 280                 ++pop;
 281         }
 282
 283         if (GetHash(sreg_keys, "sreg.nickname", 13, (void *) &data)) {
 284                 vcard_add_prop(v, "nickname", data);
 285                 ++pop;
 286         }
 287
 288         if (GetHash(sreg_keys, "sreg.fullname", 13, (void *) &data)) {
 289                 char n[256];
 290                 vcard_add_prop(v, "fn", data);
 291                 vcard_fn_to_n(n, data, sizeof n);
 292                 vcard_add_prop(v, "n", n);
 293                 ++pop;
 294         }
 295
 296         if (!GetHash(sreg_keys, "sreg.postcode", 13, (void *) &postcode)) {
 297                 postcode = NULL;
 298         }
 299
 300         if (!GetHash(sreg_keys, "sreg.country", 12, (void *) &country)) {
 301                 country = NULL;
 302         }
 303
 304         if (postcode || country) {
 305                 char adr[256];
 306                 snprintf(adr, sizeof adr, ";;;;;%s;%s",
 307                         (postcode ? postcode : ""),
 308                         (country ? country : "")
 309                 );
 310                 vcard_add_prop(v, "adr", adr);
 311                 ++pop;
 312         }
 313
 314         if (GetHash(sreg_keys, "sreg.dob", 8, (void *) &data)) {
 315                 vcard_add_prop(v, "bday", data);
 316                 ++pop;
 317         }
 318
 319         if (GetHash(sreg_keys, "sreg.gender", 11, (void *) &data)) {
 320                 vcard_add_prop(v, "x-funambol-gender", data);
 321                 ++pop;
 322         }
 323
 324         /* Only save the vCard if there is some useful data in it */
 325         if (pop > 0) {
 326                 char *ser;
 327                 ser = vcard_serialize(v);
 328                 if (ser) {
 329                         CtdlWriteObject(USERCONFIGROOM, "text/x-vcard",
 330                                 ser, strlen(ser)+1, &CC->user, 0, 0, 0
 331                         );
 332                         free(ser);
 333                 }
 334         }
 335         vcard_free(v);
 336 }
 337
 338
 339 /*
 340  * Create a new user account, manually specifying the name, after successfully
 341  * verifying an OpenID (which will of course be attached to the account)
 342  */
 343 void cmd_oidc(char *argbuf) {
 344         ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
 345
 346         if (!oiddata) {
 347                 cprintf("%d You have not verified an OpenID yet.\n", ERROR);
 348                 return;
 349         }
 350
 351         if (!oiddata->verified) {
 352                 cprintf("%d You have not verified an OpenID yet.\n", ERROR);
 353                 return;
 354         }
 355
 356         /* We can make the semantics of OIDC exactly the same as NEWU, simply
 357          * by _calling_ cmd_newu() and letting it run.  Very clever!
 358          */
 359         cmd_newu(argbuf);
 360
 361         /* Now, if this logged us in, we have to attach the OpenID */
 362         if (CC->logged_in) {
 363                 attach_openid(&CC->user, oiddata->claimed_id);
 364                 if (oiddata->sreg_keys != NULL) {
 365                         populate_vcard_from_sreg(oiddata->sreg_keys);
 366                 }
 367         }
 368
 369 }
 370
 371
 372
 373
 374 /*
 375  * Detach an OpenID from the currently logged in account
 376  */
 377 void cmd_oidd(char *argbuf) {
 378         struct cdbdata *cdboi;
 379         char id_to_detach[1024];
 380         int this_is_mine = 0;
 381         long usernum = 0L;
 382
 383         if (CtdlAccessCheck(ac_logged_in)) return;
 384         extract_token(id_to_detach, argbuf, 0, '|', sizeof id_to_detach);
 385         if (IsEmptyStr(id_to_detach)) {
 386                 cprintf("%d An empty OpenID URL is not allowed.\n", ERROR + ILLEGAL_VALUE);
 387         }
 388
 389         cdb_rewind(CDB_OPENID);
 390         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 391                 if (cdboi->len > sizeof(long)) {
 392                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 393                         if (usernum == CC->user.usernum) {
 394                                 this_is_mine = 1;
 395                         }
 396                 }
 397                 cdb_free(cdboi);
 398         }
 399
 400         if (!this_is_mine) {
 401                 cprintf("%d That OpenID was not found or not associated with your account.\n",
 402                         ERROR + ILLEGAL_VALUE);
 403                 return;
 404         }
 405
 406         cdb_delete(CDB_OPENID, id_to_detach, strlen(id_to_detach));
 407         cprintf("%d %s detached from your account.\n", CIT_OK, id_to_detach);
 408 }
 409
 410
 411
 412 /*
 413  * Attempt to auto-create a new Citadel account using the nickname from Simple Registration Extension
 414  */
 415 int openid_create_user_via_sreg(StrBuf *claimed_id, HashList *sreg_keys)
 416 {
 417         char *desired_name = NULL;
 418         char new_password[32];
 419         long len;
 420
 421         if (config.c_auth_mode != AUTHMODE_NATIVE) return(1);
 422         if (config.c_disable_newu) return(2);
 423         if (CC->logged_in) return(3);
 424         if (!GetHash(sreg_keys, "sreg.nickname", 13, (void *) &desired_name)) return(4);
 425
 426         CtdlLogPrintf(CTDL_DEBUG, "The desired account name is <%s>\n", desired_name);
 427
 428         len = cutuserkey(desired_name);
 429         if (!CtdlGetUser(&CC->user, desired_name)) {
 430                 CtdlLogPrintf(CTDL_DEBUG, "<%s> is already taken by another user.\n", desired_name);
 431                 memset(&CC->user, 0, sizeof(struct ctdluser));
 432                 return(5);
 433         }
 434
 435         /* The desired account name is available.  Create the account and log it in! */
 436         if (create_user(desired_name, len, 1)) return(6);
 437
 438         snprintf(new_password, sizeof new_password, "%08lx%08lx", random(), random());
 439         CtdlSetPassword(new_password);
 440         attach_openid(&CC->user, claimed_id);
 441         populate_vcard_from_sreg(sreg_keys);
 442         return(0);
 443 }
 444
 445
 446 /*
 447  * If a user account exists which is associated with the Claimed ID, log it in and return zero.
 448  * Otherwise it returns nonzero.
 449  */
 450 int login_via_openid(StrBuf *claimed_id)
 451 {
 452         struct cdbdata *cdboi;
 453         long usernum = 0;
 454
 455         cdboi = cdb_fetch(CDB_OPENID, ChrPtr(claimed_id), StrLength(claimed_id));
 456         if (cdboi == NULL) {
 457                 return(-1);
 458         }
 459
 460         memcpy(&usernum, cdboi->ptr, sizeof(long));
 461         cdb_free(cdboi);
 462
 463         if (!CtdlGetUserByNumber(&CC->user, usernum)) {
 464                 /* Now become the user we just created */
 465                 safestrncpy(CC->curr_user, CC->user.fullname, sizeof CC->curr_user);
 466                 do_login();
 467                 return(0);
 468         }
 469         else {
 470                 memset(&CC->user, 0, sizeof(struct ctdluser));
 471                 return(-1);
 472         }
 473 }
 474
 475
 476
 477
 478 /**************************************************************************/
 479 /*                                                                        */
 480 /* Functions in this section handle OpenID protocol                       */
 481 /*                                                                        */
 482 /**************************************************************************/
 483
 484
 485 /*
 486  * Locate a <link> tag and, given its 'rel=' parameter, return its 'href' parameter
 487  */
 488 void extract_link(StrBuf *target_buf, const char *rel, long repllen, StrBuf *source_buf)
 489 {
 490         int len, i;
 491         const char *ptr;
 492         const char *href_start = NULL;
 493         const char *href_end = NULL;
 494         const char *link_tag_start = NULL;
 495         const char *link_tag_end = NULL;
 496         const char *rel_start = NULL;
 497         const char *rel_end = NULL;
 498
 499         if (!target_buf) return;
 500         if (!rel) return;
 501         if (!source_buf) return;
 502
 503         ptr = ChrPtr(source_buf);
 504
 505         FlushStrBuf(target_buf);
 506         while (ptr = bmstrcasestr(ptr, "<link"), ptr != NULL) {
 507
 508                 link_tag_start = ptr;
 509                 link_tag_end = strchr(ptr, '>');
 510                 if (link_tag_end == NULL)
 511                         break;
 512                 for (i=0; i < 1; i++ ){
 513                         len = link_tag_end - link_tag_start;
 514
 515                         rel_start = bmstrcasestr(link_tag_start, "rel=");
 516                         if ((rel_start == NULL) ||
 517                             (rel_start > link_tag_end))
 518                                 continue;
 519
 520                         rel_start = strchr(rel_start, '\"');
 521                         if ((rel_start == NULL) ||
 522                             (rel_start > link_tag_end))
 523                                 continue;
 524                         ++rel_start;
 525                         rel_end = strchr(rel_start, '\"');
 526                         if ((rel_end == NULL) ||
 527                             (rel_end == rel_start) ||
 528                             (rel_end >= link_tag_end) )
 529                                 continue;
 530                         if (strncasecmp(rel, rel_start, repllen)!= 0)
 531                                 continue; /* didn't match? never mind... */
 532
 533                         href_start = bmstrcasestr(link_tag_start, "href=");
 534                         if ((href_start == NULL) ||
 535                             (href_start >= link_tag_end))
 536                                 continue;
 537                         href_start = strchr(href_start, '\"');
 538                         if ((href_start == NULL) |
 539                             (href_start >= link_tag_end))
 540                                 continue;
 541                         ++href_start;
 542                         href_end = strchr(href_start, '\"');
 543                         if ((href_end == NULL) ||
 544                             (href_end == href_start) ||
 545                             (href_start >= link_tag_end))
 546                                 continue;
 547                         StrBufPlain(target_buf, href_start, href_end - href_start);
 548                 }
 549                 ptr = link_tag_end;
 550         }
 551 }
 552
 553
 554 /*
 555  * Begin an HTTP fetch (returns number of bytes actually fetched, or -1 for error) using libcurl.
 556  *
 557  * If 'normalize_len' is nonzero, the caller is specifying the buffer size of 'url', and is
 558  * requesting that the effective (normalized) URL be copied back to it.
 559  */
 560 int fetch_http(StrBuf *url, StrBuf **target_buf)
 561 {
 562         StrBuf *ReplyBuf;
 563         CURL *curl;
 564         CURLcode res;
 565         char errmsg[1024] = "";
 566         char *effective_url = NULL;
 567
 568         if (StrLength(url) <=0 ) return(-1);
 569         ReplyBuf = *target_buf = NewStrBuf ();
 570         if (ReplyBuf == 0) return(-1);
 571
 572         curl = curl_easy_init();
 573         if (!curl) {
 574                 CtdlLogPrintf(CTDL_ALERT, "Unable to initialize libcurl.\n");
 575                 return(-1);
 576         }
 577
 578         curl_easy_setopt(curl, CURLOPT_URL, ChrPtr(url));
 579         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 580         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 581
 582         curl_easy_setopt(curl, CURLOPT_WRITEDATA, ReplyBuf);
 583         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, CurlFillStrBuf_callback);
 584
 585         curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
 586         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 587 #ifdef CURLOPT_HTTP_CONTENT_DECODING
 588         curl_easy_setopt(curl, CURLOPT_HTTP_CONTENT_DECODING, 1);
 589         curl_easy_setopt(curl, CURLOPT_ENCODING, "");
 590 #endif
 591         curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
 592         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 180);           /* die after 180 seconds */
 593         if (!IsEmptyStr(config.c_ip_addr)) {
 594                 curl_easy_setopt(curl, CURLOPT_INTERFACE, config.c_ip_addr);
 595         }
 596         res = curl_easy_perform(curl);
 597         if (res) {
 598                 CtdlLogPrintf(CTDL_DEBUG, "fetch_http() libcurl error %d: %s\n", res, errmsg);
 599         }
 600         curl_easy_getinfo(curl, CURLINFO_EFFECTIVE_URL, &effective_url);
 601         StrBufPlain(url, effective_url, -1);
 602
 603         curl_easy_cleanup(curl);
 604         return StrLength(ReplyBuf);
 605 }
 606
 607
 608 /*
 609  * Setup an OpenID authentication
 610  */
 611 void cmd_oids(char *argbuf) {
 612         const char *Pos = NULL;
 613         StrBuf *ArgBuf = NULL;
 614         StrBuf *ReplyBuf = NULL;
 615         StrBuf *return_to = NULL;
 616         StrBuf *trust_root = NULL;
 617         StrBuf *openid_delegate = NULL;
 618         StrBuf *RedirectUrl = NULL;
 619         int i;
 620         struct CitContext *CCC = CC;    /* CachedCitContext - performance boost */
 621         ctdl_openid *oiddata;
 622
 623         Free_ctdl_openid ((ctdl_openid**)&CCC->openid_data);
 624
 625         CCC->openid_data = oiddata = malloc(sizeof(ctdl_openid));
 626         if (oiddata == NULL) {
 627                 cprintf("%d malloc failed\n", ERROR + INTERNAL_ERROR);
 628                 return;
 629         }
 630         memset(oiddata, 0, sizeof(ctdl_openid));
 631         CCC->openid_data = (void *) oiddata;
 632
 633         ArgBuf = NewStrBufPlain(argbuf, -1);
 634
 635         oiddata->claimed_id = NewStrBufPlain(NULL, StrLength(ArgBuf));
 636         trust_root = NewStrBufPlain(NULL, StrLength(ArgBuf));
 637         return_to = NewStrBufPlain(NULL, StrLength(ArgBuf));
 638
 639         StrBufExtract_NextToken(oiddata->claimed_id, ArgBuf, &Pos, '|');
 640         StrBufExtract_NextToken(return_to, ArgBuf, &Pos, '|');
 641         StrBufExtract_NextToken(trust_root, ArgBuf, &Pos, '|');
 642
 643         oiddata->verified = 0;
 644
 645         i = fetch_http(oiddata->claimed_id, &ReplyBuf);
 646         CtdlLogPrintf(CTDL_DEBUG, "Normalized URL and Claimed ID is: %s\n",
 647                       ChrPtr(oiddata->claimed_id));
 648         if ((StrLength(ReplyBuf) > 0) && (i > 0)) {
 649
 650                 openid_delegate = NewStrBuf();
 651                 oiddata->server = NewStrBuf();
 652                 extract_link(oiddata->server, HKEY("openid.server"), ReplyBuf);
 653                 extract_link(openid_delegate, HKEY("openid.delegate"), ReplyBuf);
 654
 655                 if (StrLength(oiddata->server) == 0) {
 656                         cprintf("%d There is no OpenID identity provider at this URL.\n", ERROR);
 657                         FreeStrBuf(&ArgBuf);
 658                         FreeStrBuf(&ReplyBuf);
 659                         FreeStrBuf(&return_to);
 660                         FreeStrBuf(&trust_root);
 661                         FreeStrBuf(&openid_delegate);
 662                         FreeStrBuf(&RedirectUrl);
 663                         return;
 664                 }
 665
 666                 /* Empty delegate is legal; we just use the openid_url instead */
 667                 if (StrLength(openid_delegate) == 0) {
 668                         StrBufPlain(openid_delegate, SKEY(oiddata->claimed_id));
 669                 }
 670
 671                 /* Assemble a URL to which the user-agent will be redirected. */
 672
 673                 RedirectUrl = NewStrBufDup(oiddata->server);
 674
 675                 StrBufAppendBufPlain(RedirectUrl, HKEY("?openid.mode=checkid_setup"
 676                                                        "&openid.identity="), 0);
 677                 StrBufUrlescAppend(RedirectUrl, openid_delegate, NULL);
 678
 679                 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.return_to="), 0);
 680                 StrBufUrlescAppend(RedirectUrl, return_to, NULL);
 681
 682                 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.trust_root="), 0);
 683                 StrBufUrlescAppend(RedirectUrl, trust_root, NULL);
 684
 685                 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.sreg.optional="), 0);
 686                 StrBufUrlescAppend(RedirectUrl, NULL, "nickname,email,fullname,postcode,country,dob,gender");
 687
 688                 cprintf("%d %s\n", CIT_OK, ChrPtr(RedirectUrl));
 689
 690                 FreeStrBuf(&ArgBuf);
 691                 FreeStrBuf(&ReplyBuf);
 692                 FreeStrBuf(&return_to);
 693                 FreeStrBuf(&trust_root);
 694                 FreeStrBuf(&openid_delegate);
 695                 FreeStrBuf(&RedirectUrl);
 696
 697                 return;
 698         }
 699         FreeStrBuf(&ArgBuf);
 700         FreeStrBuf(&ReplyBuf);
 701         FreeStrBuf(&return_to);
 702         FreeStrBuf(&trust_root);
 703         FreeStrBuf(&openid_delegate);
 704         FreeStrBuf(&RedirectUrl);
 705
 706         cprintf("%d Unable to fetch OpenID URL\n", ERROR);
 707 }
 708
 709
 710
 711
 712
 713 /*
 714  * Finalize an OpenID authentication
 715  */
 716 void cmd_oidf(char *argbuf) {
 717         long len;
 718         char buf[2048];
 719         char thiskey[1024];
 720         char thisdata[1024];
 721         HashList *keys = NULL;
 722         ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
 723
 724         if (oiddata == NULL) {
 725                 cprintf("%d run OIDS first.\n", ERROR + INTERNAL_ERROR);
 726                 return;
 727         }
 728         if (StrLength(oiddata->server) == 0){
 729                 cprintf("%d need a remote server to authenticate against\n", ERROR + ILLEGAL_VALUE);
 730                 return;
 731         }
 732         keys = NewHash(1, NULL);
 733         if (!keys) {
 734                 cprintf("%d NewHash() failed\n", ERROR + INTERNAL_ERROR);
 735                 return;
 736         }
 737         cprintf("%d Transmit OpenID data now\n", START_CHAT_MODE);
 738
 739         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 740                 len = extract_token(thiskey, buf, 0, '|', sizeof thiskey);
 741                 if (len < 0)
 742                         len = sizeof(thiskey) - 1;
 743                 extract_token(thisdata, buf, 1, '|', sizeof thisdata);
 744                 CtdlLogPrintf(CTDL_DEBUG, "%s: [%d] %s\n", thiskey, strlen(thisdata), thisdata);
 745                 Put(keys, thiskey, len, strdup(thisdata), NULL);
 746         }
 747
 748
 749         /* Now that we have all of the parameters, we have to validate the signature against the server */
 750         CtdlLogPrintf(CTDL_DEBUG, "About to validate the signature...\n");
 751
 752         CURL *curl;
 753         CURLcode res;
 754         struct curl_httppost *formpost = NULL;
 755         struct curl_httppost *lastptr = NULL;
 756         char errmsg[1024] = "";
 757         char *o_assoc_handle = NULL;
 758         char *o_sig = NULL;
 759         char *o_signed = NULL;
 760         int num_signed_values;
 761         int i;
 762         char k_keyname[128];
 763         char k_o_keyname[128];
 764         char *k_value = NULL;
 765         StrBuf *ReplyBuf;
 766
 767         curl_formadd(&formpost, &lastptr,
 768                 CURLFORM_COPYNAME,      "openid.mode",
 769                 CURLFORM_COPYCONTENTS,  "check_authentication",
 770                 CURLFORM_END);
 771         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.mode", "check_authentication");
 772
 773         if (GetHash(keys, "assoc_handle", 12, (void *) &o_assoc_handle)) {
 774                 curl_formadd(&formpost, &lastptr,
 775                         CURLFORM_COPYNAME,      "openid.assoc_handle",
 776                         CURLFORM_COPYCONTENTS,  o_assoc_handle,
 777                         CURLFORM_END);
 778                 CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.assoc_handle", o_assoc_handle);
 779         }
 780
 781         if (GetHash(keys, "sig", 3, (void *) &o_sig)) {
 782                 curl_formadd(&formpost, &lastptr,
 783                         CURLFORM_COPYNAME,      "openid.sig",
 784                         CURLFORM_COPYCONTENTS,  o_sig,
 785                         CURLFORM_END);
 786                         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.sig", o_sig);
 787         }
 788
 789         if (GetHash(keys, "signed", 6, (void *) &o_signed)) {
 790                 curl_formadd(&formpost, &lastptr,
 791                         CURLFORM_COPYNAME,      "openid.signed",
 792                         CURLFORM_COPYCONTENTS,  o_signed,
 793                         CURLFORM_END);
 794                 CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.signed", o_signed);
 795
 796                 num_signed_values = num_tokens(o_signed, ',');
 797                 for (i=0; i<num_signed_values; ++i) {
 798                         extract_token(k_keyname, o_signed, i, ',', sizeof k_keyname);
 799                         if (strcasecmp(k_keyname, "mode")) {    // work around phpMyID bug
 800                                 if (GetHash(keys, k_keyname, strlen(k_keyname), (void *) &k_value)) {
 801                                         snprintf(k_o_keyname, sizeof k_o_keyname, "openid.%s", k_keyname);
 802                                         curl_formadd(&formpost, &lastptr,
 803                                                 CURLFORM_COPYNAME,      k_o_keyname,
 804                                                 CURLFORM_COPYCONTENTS,  k_value,
 805                                                 CURLFORM_END);
 806                                         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", k_o_keyname, k_value);
 807                                 }
 808                                 else {
 809                                         CtdlLogPrintf(CTDL_INFO, "OpenID: signed field '%s' is missing\n",
 810                                                 k_keyname);
 811                                 }
 812                         }
 813                 }
 814         }
 815
 816         ReplyBuf = NewStrBuf();
 817
 818         curl = curl_easy_init();
 819         curl_easy_setopt(curl, CURLOPT_URL, ChrPtr(oiddata->server));
 820         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 821         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 822
 823         curl_easy_setopt(curl, CURLOPT_WRITEDATA, ReplyBuf);
 824         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, CurlFillStrBuf_callback);
 825         curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 826         curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
 827         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 828 #ifdef CURLOPT_HTTP_CONTENT_DECODING
 829         curl_easy_setopt(curl, CURLOPT_HTTP_CONTENT_DECODING, 1);
 830         curl_easy_setopt(curl, CURLOPT_ENCODING, "");
 831 #endif
 832         curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
 833         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 180);           /* die after 180 seconds */
 834         if (!IsEmptyStr(config.c_ip_addr)) {
 835                 curl_easy_setopt(curl, CURLOPT_INTERFACE, config.c_ip_addr);
 836         }
 837
 838         res = curl_easy_perform(curl);
 839         if (res) {
 840                 CtdlLogPrintf(CTDL_DEBUG, "cmd_oidf() libcurl error %d: %s\n", res, errmsg);
 841         }
 842         curl_easy_cleanup(curl);
 843         curl_formfree(formpost);
 844
 845         if (bmstrcasestr(ChrPtr(ReplyBuf), "is_valid:true")) {
 846                 oiddata->verified = 1;
 847         }
 848         FreeStrBuf(&ReplyBuf);
 849
 850         CtdlLogPrintf(CTDL_DEBUG, "Authentication %s.\n", (oiddata->verified ? "succeeded" : "failed") );
 851
 852         /* Respond to the client */
 853
 854         if (oiddata->verified) {
 855
 856                 /* If we were already logged in, attach the OpenID to the user's account */
 857                 if (CC->logged_in) {
 858                         if (attach_openid(&CC->user, oiddata->claimed_id) == 0) {
 859                                 cprintf("attach\n");
 860                                 CtdlLogPrintf(CTDL_DEBUG, "OpenID attach succeeded\n");
 861                         }
 862                         else {
 863                                 cprintf("fail\n");
 864                                 CtdlLogPrintf(CTDL_DEBUG, "OpenID attach failed\n");
 865                         }
 866                 }
 867
 868                 /* Otherwise, a user is attempting to log in using the verified OpenID */
 869                 else {
 870                         /*
 871                          * Existing user who has claimed this OpenID?
 872                          *
 873                          * Note: if you think that sending the password back over the wire is insecure,
 874                          * check your assumptions.  If someone has successfully asserted an OpenID that
 875                          * is associated with the account, they already have password equivalency and can
 876                          * login, so they could just as easily change the password, etc.
 877                          */
 878                         if (login_via_openid(oiddata->claimed_id) == 0) {
 879                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
 880                                 logged_in_response();
 881                                 CtdlLogPrintf(CTDL_DEBUG, "Logged in using previously claimed OpenID\n");
 882                         }
 883
 884                         /*
 885                          * If this system does not allow self-service new user registration, the
 886                          * remaining modes do not apply, so fail here and now.
 887                          */
 888                         else if (config.c_disable_newu) {
 889                                 cprintf("fail\n");
 890                                 CtdlLogPrintf(CTDL_DEBUG, "Creating user failed due to local policy\n");
 891                         }
 892
 893                         /*
 894                          * New user whose OpenID is verified and Simple Registration Extension is in use?
 895                          */
 896                         else if (openid_create_user_via_sreg(oiddata->claimed_id, keys) == 0) {
 897                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
 898                                 logged_in_response();
 899                                 CtdlLogPrintf(CTDL_DEBUG, "Successfully auto-created new user\n");
 900                         }
 901
 902                         /*
 903                          * OpenID is verified, but the desired username either was not specified or
 904                          * conflicts with an existing user.  Manual account creation is required.
 905                          */
 906                         else {
 907                                 char *desired_name = NULL;
 908                                 cprintf("verify_only\n");
 909                                 cprintf("%s\n", ChrPtr(oiddata->claimed_id));
 910                                 if (GetHash(keys, "sreg.nickname", 13, (void *) &desired_name)) {
 911                                         cprintf("%s\n", desired_name);
 912                                 }
 913                                 else {
 914                                         cprintf("\n");
 915                                 }
 916                                 CtdlLogPrintf(CTDL_DEBUG, "The desired Simple Registration name is already taken.\n");
 917                         }
 918                 }
 919         }
 920         else {
 921                 cprintf("fail\n");
 922         }
 923         cprintf("000\n");
 924
 925         if (oiddata->sreg_keys != NULL) {
 926                 DeleteHash(&oiddata->sreg_keys);
 927                 oiddata->sreg_keys = NULL;
 928         }
 929         oiddata->sreg_keys = keys;
 930 }
 931
 932
 933
 934 /**************************************************************************/
 935 /*                                                                        */
 936 /* Functions in this section handle module initialization and shutdown    */
 937 /*                                                                        */
 938 /**************************************************************************/
 939
 940
 941
 942
 943 CTDL_MODULE_INIT(openid_rp)
 944 {
 945         if (!threading) {
 946                 curl_global_init(CURL_GLOBAL_ALL);
 947
 948                 /* Only enable the OpenID command set when native mode authentication is in use. */
 949                 if (config.c_auth_mode == AUTHMODE_NATIVE) {
 950                         CtdlRegisterProtoHook(cmd_oids, "OIDS", "Setup OpenID authentication");
 951                         CtdlRegisterProtoHook(cmd_oidf, "OIDF", "Finalize OpenID authentication");
 952                         CtdlRegisterProtoHook(cmd_oidl, "OIDL", "List OpenIDs associated with an account");
 953                         CtdlRegisterProtoHook(cmd_oidd, "OIDD", "Detach an OpenID from an account");
 954                         CtdlRegisterProtoHook(cmd_oidc, "OIDC", "Create new user after validating OpenID");
 955                         CtdlRegisterProtoHook(cmd_oida, "OIDA", "List all OpenIDs in the database");
 956                 }
 957                 CtdlRegisterSessionHook(openid_cleanup_function, EVT_LOGOUT);
 958                 CtdlRegisterUserHook(openid_purge, EVT_PURGEUSER);
 959         }
 960
 961         /* return our Subversion id for the Log */
 962         return "$Id$";
 963 }