citadel/modules/openid/serv_openid_rp.c

   1 /*
   2  * This is an implementation of OpenID 2.0 RELYING PARTY SUPPORT CURRENTLY B0RKEN AND BEING DEVEL0PZ0RED
   3
   4
   5                         OPENID2 BRANCH
   6
   7  *
   8  * Copyright (c) 2007-2011 by the citadel.org team
   9  *
  10  * This program is open source software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 3 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  22  */
  23
  24 #include "sysdep.h"
  25 #include <stdlib.h>
  26 #include <unistd.h>
  27 #include <stdio.h>
  28 #include <fcntl.h>
  29 #include <signal.h>
  30 #include <pwd.h>
  31 #include <errno.h>
  32 #include <sys/types.h>
  33
  34 #if TIME_WITH_SYS_TIME
  35 # include <sys/time.h>
  36 # include <time.h>
  37 #else
  38 # if HAVE_SYS_TIME_H
  39 #  include <sys/time.h>
  40 # else
  41 #  include <time.h>
  42 # endif
  43 #endif
  44
  45 #include <sys/wait.h>
  46 #include <string.h>
  47 #include <limits.h>
  48 #include <curl/curl.h>
  49 #include <expat.h>
  50 #include "ctdl_module.h"
  51 #include "config.h"
  52 #include "citserver.h"
  53 #include "user_ops.h"
  54
  55 typedef struct _ctdl_openid {
  56         StrBuf *claimed_id;
  57         StrBuf *server;
  58         int verified;
  59         HashList *sreg_keys;
  60 } ctdl_openid;
  61
  62 void Free_ctdl_openid(ctdl_openid **FreeMe)
  63 {
  64         if (*FreeMe == NULL)
  65                 return;
  66         FreeStrBuf(&(*FreeMe)->claimed_id);
  67         FreeStrBuf(&(*FreeMe)->server);
  68         DeleteHash(&(*FreeMe)->sreg_keys);
  69         free(*FreeMe);
  70         *FreeMe = NULL;
  71 }
  72
  73
  74 /*
  75  * This cleanup function blows away the temporary memory used by this module.
  76  */
  77 void openid_cleanup_function(void) {
  78         struct CitContext *CCC = CC;    /* CachedCitContext - performance boost */
  79
  80         if (CCC->openid_data != NULL) {
  81                 syslog(LOG_DEBUG, "Clearing OpenID session state");
  82                 Free_ctdl_openid((ctdl_openid **) &CCC->openid_data);
  83         }
  84 }
  85
  86
  87 /**************************************************************************/
  88 /*                                                                        */
  89 /* Functions in this section handle Citadel internal OpenID mapping stuff */
  90 /*                                                                        */
  91 /**************************************************************************/
  92
  93
  94 /*
  95  * The structure of an openid record *key* is:
  96  *
  97  * |--------------claimed_id-------------|
  98  *     (actual length of claimed id)
  99  *
 100  *
 101  * The structure of an openid record *value* is:
 102  *
 103  * |-----user_number----|------------claimed_id---------------|
 104  *    (sizeof long)          (actual length of claimed id)
 105  *
 106  */
 107
 108
 109
 110 /*
 111  * Attach an OpenID to a Citadel account
 112  */
 113 int attach_openid(struct ctdluser *who, StrBuf *claimed_id)
 114 {
 115         struct cdbdata *cdboi;
 116         long fetched_usernum;
 117         char *data;
 118         int data_len;
 119         char buf[2048];
 120
 121         if (!who) return(1);
 122         if (StrLength(claimed_id)==0) return(1);
 123
 124         /* Check to see if this OpenID is already in the database */
 125
 126         cdboi = cdb_fetch(CDB_OPENID, ChrPtr(claimed_id), StrLength(claimed_id));
 127         if (cdboi != NULL) {
 128                 memcpy(&fetched_usernum, cdboi->ptr, sizeof(long));
 129                 cdb_free(cdboi);
 130
 131                 if (fetched_usernum == who->usernum) {
 132                         syslog(LOG_INFO, "%s already associated; no action is taken", ChrPtr(claimed_id));
 133                         return(0);
 134                 }
 135                 else {
 136                         syslog(LOG_INFO, "%s already belongs to another user", ChrPtr(claimed_id));
 137                         return(3);
 138                 }
 139         }
 140
 141         /* Not already in the database, so attach it now */
 142
 143         data_len = sizeof(long) + StrLength(claimed_id) + 1;
 144         data = malloc(data_len);
 145
 146         memcpy(data, &who->usernum, sizeof(long));
 147         memcpy(&data[sizeof(long)], ChrPtr(claimed_id), StrLength(claimed_id) + 1);
 148
 149         cdb_store(CDB_OPENID, ChrPtr(claimed_id), StrLength(claimed_id), data, data_len);
 150         free(data);
 151
 152         snprintf(buf, sizeof buf, "User <%s> (#%ld) has claimed the OpenID URL %s\n",
 153                  who->fullname, who->usernum, ChrPtr(claimed_id));
 154         CtdlAideMessage(buf, "OpenID claim");
 155         syslog(LOG_INFO, "%s", buf);
 156         return(0);
 157 }
 158
 159
 160
 161 /*
 162  * When a user is being deleted, we have to delete any OpenID associations
 163  */
 164 void openid_purge(struct ctdluser *usbuf) {
 165         struct cdbdata *cdboi;
 166         HashList *keys = NULL;
 167         HashPos *HashPos;
 168         char *deleteme = NULL;
 169         long len;
 170         void *Value;
 171         const char *Key;
 172         long usernum = 0L;
 173
 174         keys = NewHash(1, NULL);
 175         if (!keys) return;
 176
 177         cdb_rewind(CDB_OPENID);
 178         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 179                 if (cdboi->len > sizeof(long)) {
 180                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 181                         if (usernum == usbuf->usernum) {
 182                                 deleteme = strdup(cdboi->ptr + sizeof(long)),
 183                                 Put(keys, deleteme, strlen(deleteme), deleteme, NULL);
 184                         }
 185                 }
 186                 cdb_free(cdboi);
 187         }
 188
 189         /* Go through the hash list, deleting keys we stored in it */
 190
 191         HashPos = GetNewHashPos(keys, 0);
 192         while (GetNextHashPos(keys, HashPos, &len, &Key, &Value)!=0)
 193         {
 194                 syslog(LOG_DEBUG, "Deleting associated OpenID <%s>", (char*)Value);
 195                 cdb_delete(CDB_OPENID, Value, strlen(Value));
 196                 /* note: don't free(Value) -- deleting the hash list will handle this for us */
 197         }
 198         DeleteHashPos(&HashPos);
 199         DeleteHash(&keys);
 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  * 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>", 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.", 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  * Wrapper for curl_easy_init() that includes the options common to all calls
 552  * used in this module.
 553  */
 554 CURL *ctdl_openid_curl_easy_init(char *errmsg) {
 555         CURL *curl;
 556
 557         curl = curl_easy_init();
 558         if (!curl) {
 559                 return(curl);
 560         }
 561
 562         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 563         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 564
 565         if (errmsg) {
 566                 curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
 567         }
 568         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 569 #ifdef CURLOPT_HTTP_CONTENT_DECODING
 570         curl_easy_setopt(curl, CURLOPT_HTTP_CONTENT_DECODING, 1);
 571         curl_easy_setopt(curl, CURLOPT_ENCODING, "");
 572 #endif
 573         curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
 574         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 30);            /* die after 30 seconds */
 575
 576         if (
 577                 (!IsEmptyStr(config.c_ip_addr))
 578                 && (strcmp(config.c_ip_addr, "*"))
 579                 && (strcmp(config.c_ip_addr, "::"))
 580                 && (strcmp(config.c_ip_addr, "0.0.0.0"))
 581         ) {
 582                 curl_easy_setopt(curl, CURLOPT_INTERFACE, config.c_ip_addr);
 583         }
 584
 585         return(curl);
 586 }
 587
 588
 589 /*
 590  * Begin an HTTP fetch (returns number of bytes actually fetched, or -1 for error) using libcurl.
 591  */
 592 int fetch_http(StrBuf *url, StrBuf **target_buf)
 593 {
 594         StrBuf *ReplyBuf;
 595         CURL *curl;
 596         CURLcode result;
 597         char *effective_url = NULL;
 598         char errmsg[1024] = "";
 599
 600         if (StrLength(url) <=0 ) return(-1);
 601         ReplyBuf = *target_buf = NewStrBuf ();
 602         if (ReplyBuf == 0) return(-1);
 603
 604         curl = ctdl_openid_curl_easy_init(errmsg);
 605         if (!curl) return(-1);
 606
 607         curl_easy_setopt(curl, CURLOPT_URL, ChrPtr(url));
 608         curl_easy_setopt(curl, CURLOPT_WRITEDATA, ReplyBuf);
 609         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, CurlFillStrBuf_callback);
 610
 611         result = curl_easy_perform(curl);
 612         if (result) {
 613                 syslog(LOG_DEBUG, "libcurl error %d: %s", result, errmsg);
 614         }
 615         curl_easy_getinfo(curl, CURLINFO_EFFECTIVE_URL, &effective_url);
 616         StrBufPlain(url, effective_url, -1);
 617
 618         curl_easy_cleanup(curl);
 619         return StrLength(ReplyBuf);
 620 }
 621
 622
 623
 624 struct xrds {
 625         int nesting_level;
 626         int in_xrd;
 627         int current_service_priority;
 628         int selected_service_priority;  /* more here later */
 629 };
 630
 631
 632 void xrds_xml_start(void *data, const char *supplied_el, const char **attr) {
 633         struct xrds *xrds = (struct xrds *) data;
 634         int i;
 635
 636         ++xrds->nesting_level;
 637
 638         if (!strcasecmp(supplied_el, "XRD")) {
 639                 ++xrds->in_xrd;
 640                 syslog(LOG_DEBUG, "*** XRD CONTAINER BEGIN ***");
 641         }
 642
 643         else if (!strcasecmp(supplied_el, "service")) {
 644                 xrds->current_service_priority = 0;
 645                 for (i=0; attr[i] != NULL; i+=2) {
 646                         if (!strcasecmp(attr[i], "priority")) {
 647                                 xrds->current_service_priority = atoi(attr[i+1]);
 648                         }
 649                 }
 650         }
 651 }
 652
 653
 654 void xrds_xml_end(void *data, const char *supplied_el) {
 655         struct xrds *xrds = (struct xrds *) data;
 656
 657         --xrds->nesting_level;
 658
 659         if (!strcasecmp(supplied_el, "XRD")) {
 660                 --xrds->in_xrd;
 661                 syslog(LOG_DEBUG, "*** XRD CONTAINER END ***");
 662         }
 663
 664         else if (!strcasecmp(supplied_el, "service")) {
 665                 /* this is where we should evaluate the service and do stuff */
 666                 xrds->current_service_priority = 0;
 667         }
 668 }
 669
 670
 671 void xrds_xml_chardata(void *data, const XML_Char *s, int len) {
 672         struct xrds *xrds = (struct xrds *) data;
 673
 674         if (xrds) ;     /* this is only here to silence the warning for now */
 675
 676         /* StrBufAppendBufPlain (xrds->CData, s, len, 0); */
 677 }
 678
 679
 680 /*
 681  * Parse an XRDS document.
 682  * If OpenID stuff is discovered, populate FIXME something and return nonzero
 683  * If nothing useful happened, return 0.
 684  */
 685 int parse_xrds_document(StrBuf *ReplyBuf) {
 686         struct xrds xrds;
 687
 688         syslog(LOG_DEBUG, "\033[32m --- XRDS DOCUMENT --- \n%s\033[0m", ChrPtr(ReplyBuf));
 689
 690         memset(&xrds, 0, sizeof (struct xrds));
 691         XML_Parser xp = XML_ParserCreate(NULL);
 692         if (xp) {
 693                 XML_SetUserData(xp, &xrds);
 694                 XML_SetElementHandler(xp, xrds_xml_start, xrds_xml_end);
 695                 XML_SetCharacterDataHandler(xp, xrds_xml_chardata);
 696                 XML_Parse(xp, ChrPtr(ReplyBuf), StrLength(ReplyBuf), 0);
 697                 XML_Parse(xp, "", 0, 1);
 698                 XML_ParserFree(xp);
 699         }
 700         else {
 701                 syslog(LOG_ALERT, "Cannot create XML parser");
 702         }
 703
 704         return(0);      /* FIXME return nonzero if something wonderful happened */
 705 }
 706
 707
 708
 709 /*
 710  * Callback function for perform_openid2_discovery()
 711  * We're interested in the X-XRDS-Location: header.
 712  */
 713 size_t yadis_headerfunction(void *ptr, size_t size, size_t nmemb, void *userdata) {
 714         char hdr[1024];
 715         StrBuf **x_xrds_location = (StrBuf **) userdata;
 716
 717         memcpy(hdr, ptr, (size*nmemb));
 718         hdr[size*nmemb] = 0;
 719
 720         if (!strncasecmp(hdr, "X-XRDS-Location:", 16)) {
 721                 *x_xrds_location = NewStrBufPlain(&hdr[16], ((size*nmemb)-16));
 722                 StrBufTrim(*x_xrds_location);
 723         }
 724
 725         return(size * nmemb);
 726 }
 727
 728
 729
 730 /* Attempt to perform Yadis discovery as specified in Yadis 1.0 section 6.2.5.
 731  *
 732  * If Yadis fails, we then attempt HTML discovery using the same document.
 733  *
 734  * If successful, returns nonzero and calls parse_xrds_document() to act upon the received data.
 735  * If fails, returns 0 and does nothing else.
 736  */
 737 int perform_openid2_discovery(StrBuf *YadisURL) {
 738         int docbytes = (-1);
 739         StrBuf *ReplyBuf = NULL;
 740         int return_value = 0;
 741         CURL *curl;
 742         CURLcode result;
 743         char errmsg[1024] = "";
 744         struct curl_slist *my_headers = NULL;
 745         StrBuf *x_xrds_location = NULL;
 746
 747         if (YadisURL == NULL) return(0);
 748         syslog(LOG_DEBUG, "perform_openid2_discovery(%s)", ChrPtr(YadisURL));
 749         if (StrLength(YadisURL) == 0) return(0);
 750
 751         ReplyBuf = NewStrBuf ();
 752         if (ReplyBuf == 0) return(0);
 753
 754         curl = ctdl_openid_curl_easy_init(errmsg);
 755         if (!curl) return(0);
 756
 757         curl_easy_setopt(curl, CURLOPT_URL, ChrPtr(YadisURL));
 758         curl_easy_setopt(curl, CURLOPT_WRITEDATA, ReplyBuf);
 759         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, CurlFillStrBuf_callback);
 760
 761         my_headers = curl_slist_append(my_headers, "Accept:");  /* disable the default Accept: header */
 762         my_headers = curl_slist_append(my_headers, "Accept: application/xrds+xml");
 763         curl_easy_setopt(curl, CURLOPT_HTTPHEADER, my_headers);
 764
 765         curl_easy_setopt(curl, CURLOPT_WRITEHEADER, &x_xrds_location);
 766         curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, yadis_headerfunction);
 767
 768         result = curl_easy_perform(curl);
 769         if (result) {
 770                 syslog(LOG_DEBUG, "libcurl error %d: %s", result, errmsg);
 771         }
 772         curl_slist_free_all(my_headers);
 773         curl_easy_cleanup(curl);
 774         docbytes = StrLength(ReplyBuf);
 775
 776         /*
 777          * The response from the server will be one of:
 778          *
 779          * Option 1: An HTML document with a <head> element that includes a <meta> element with http-equiv
 780          * attribute, X-XRDS-Location,
 781          */
 782         /* FIXME handle this somehow */
 783
 784         /*
 785          * Option 2: HTTP response-headers that include an X-XRDS-Location response-header,
 786          *           together with a document.
 787          * Option 3: HTTP response-headers only, which MAY include an X-XRDS-Location response-header,
 788          *           a contenttype response-header specifying MIME media type,
 789          *           application/xrds+xml, or both.
 790          *
 791          * If the X-XRDS-Location header was delivered, we know about it at this point...
 792          */
 793         if (    (x_xrds_location)
 794                 && (strcmp(ChrPtr(x_xrds_location), ChrPtr(YadisURL)))
 795         ) {
 796                 syslog(LOG_DEBUG, "X-XRDS-Location: %s ... recursing!", ChrPtr(x_xrds_location));
 797                 return_value = perform_openid2_discovery(x_xrds_location);
 798                 FreeStrBuf(&x_xrds_location);
 799         }
 800
 801         /*
 802          * Option 4: the returned web page may *be* an XRDS document.  Try to parse it.
 803          */
 804         else if (docbytes >= 0) {
 805                 return_value = parse_xrds_document(ReplyBuf);
 806         }
 807
 808         /*
 809          * Option 5: if all else fails, attempt HTML based discovery.
 810          */
 811         if (return_value == 0) {
 812                 syslog(LOG_DEBUG, "Attempting HTML discovery");
 813                 StrBuf *foo = NewStrBuf();
 814                 extract_link(foo, HKEY("openid2.provider"), ReplyBuf);
 815                 if (StrLength(foo) > 0) {
 816                         syslog(LOG_DEBUG, "\033[31mHTML DISCO PROVIDER: %s\033[0m", ChrPtr(foo));
 817                 }
 818                 FreeStrBuf(&foo);
 819         }
 820
 821         if (ReplyBuf != NULL) {
 822                 FreeStrBuf(&ReplyBuf);
 823         }
 824         return(return_value);
 825 }
 826
 827
 828 /*
 829  * Setup an OpenID authentication
 830  */
 831 void cmd_oids(char *argbuf) {
 832         struct CitContext *CCC = CC;    /* CachedCitContext - performance boost */
 833         const char *Pos = NULL;
 834         StrBuf *ArgBuf = NULL;
 835         StrBuf *ReplyBuf = NULL;
 836         StrBuf *return_to = NULL;
 837         StrBuf *trust_root = NULL;
 838         StrBuf *openid_delegate = NULL;
 839         StrBuf *RedirectUrl = NULL;
 840         ctdl_openid *oiddata;
 841         int discovery_succeeded = 0;
 842
 843         Free_ctdl_openid ((ctdl_openid**)&CCC->openid_data);
 844
 845         CCC->openid_data = oiddata = malloc(sizeof(ctdl_openid));
 846         if (oiddata == NULL) {
 847                 cprintf("%d malloc failed\n", ERROR + INTERNAL_ERROR);
 848                 return;
 849         }
 850         memset(oiddata, 0, sizeof(ctdl_openid));
 851         CCC->openid_data = (void *) oiddata;
 852
 853         ArgBuf = NewStrBufPlain(argbuf, -1);
 854
 855         oiddata->verified = 0;
 856         oiddata->claimed_id = NewStrBufPlain(NULL, StrLength(ArgBuf));
 857         trust_root = NewStrBufPlain(NULL, StrLength(ArgBuf));
 858         return_to = NewStrBufPlain(NULL, StrLength(ArgBuf));
 859
 860         StrBufExtract_NextToken(oiddata->claimed_id, ArgBuf, &Pos, '|');
 861         StrBufExtract_NextToken(return_to, ArgBuf, &Pos, '|');
 862         StrBufExtract_NextToken(trust_root, ArgBuf, &Pos, '|');
 863
 864         syslog(LOG_DEBUG, "User-Supplied Identifier is: %s", ChrPtr(oiddata->claimed_id));
 865
 866
 867         /********** OpenID 2.0 section 7.3 - Discovery **********/
 868
 869         /* Section 7.3.1 says we have to attempt XRI based discovery.
 870          * No one is using this, no one is asking for it, no one wants it.
 871          * So we're not even going to bother attempting this mode.
 872          */
 873
 874         /* Attempt section 7.3.2 (Yadis discovery) and section 7.3.3 (HTML discovery);
 875          */
 876         discovery_succeeded = perform_openid2_discovery(oiddata->claimed_id);
 877
 878
 879
 880         /************ OPENID 1.1 **********/
 881
 882         if (    (fetch_http(oiddata->claimed_id, &ReplyBuf) > 0)
 883                 && (StrLength(ReplyBuf) > 0)
 884         ) {
 885                 openid_delegate = NewStrBuf();
 886                 oiddata->server = NewStrBuf();
 887                 extract_link(oiddata->server, HKEY("openid.server"), ReplyBuf);
 888                 extract_link(openid_delegate, HKEY("openid.delegate"), ReplyBuf);
 889
 890                 if (StrLength(oiddata->server) == 0) {
 891                         cprintf("%d There is no OpenID identity provider at this URL.\n", ERROR);
 892                         FreeStrBuf(&ArgBuf);
 893                         FreeStrBuf(&ReplyBuf);
 894                         FreeStrBuf(&return_to);
 895                         FreeStrBuf(&trust_root);
 896                         FreeStrBuf(&openid_delegate);
 897                         FreeStrBuf(&RedirectUrl);
 898                         return;
 899                 }
 900
 901                 /* Empty delegate is legal; we just use the openid_url instead */
 902                 if (StrLength(openid_delegate) == 0) {
 903                         StrBufPlain(openid_delegate, SKEY(oiddata->claimed_id));
 904                 }
 905
 906                 /* Assemble a URL to which the user-agent will be redirected. */
 907
 908                 RedirectUrl = NewStrBufDup(oiddata->server);
 909
 910                 StrBufAppendBufPlain(RedirectUrl, HKEY("?openid.mode=checkid_setup"
 911                                                        "&openid.identity="), 0);
 912                 StrBufUrlescAppend(RedirectUrl, openid_delegate, NULL);
 913
 914                 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.return_to="), 0);
 915                 StrBufUrlescAppend(RedirectUrl, return_to, NULL);
 916
 917                 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.trust_root="), 0);
 918                 StrBufUrlescAppend(RedirectUrl, trust_root, NULL);
 919
 920                 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.sreg.optional="), 0);
 921                 StrBufUrlescAppend(RedirectUrl, NULL, "nickname,email,fullname,postcode,country,dob,gender");
 922
 923                 cprintf("%d %s\n", CIT_OK, ChrPtr(RedirectUrl));
 924
 925                 FreeStrBuf(&ArgBuf);
 926                 FreeStrBuf(&ReplyBuf);
 927                 FreeStrBuf(&return_to);
 928                 FreeStrBuf(&trust_root);
 929                 FreeStrBuf(&openid_delegate);
 930                 FreeStrBuf(&RedirectUrl);
 931
 932                 return;
 933         }
 934
 935         FreeStrBuf(&ArgBuf);
 936         FreeStrBuf(&ReplyBuf);
 937         FreeStrBuf(&return_to);
 938         FreeStrBuf(&trust_root);
 939         FreeStrBuf(&openid_delegate);
 940         FreeStrBuf(&RedirectUrl);
 941
 942         cprintf("%d Unable to fetch OpenID URL\n", ERROR);
 943 }
 944
 945
 946
 947
 948
 949 /*
 950  * Finalize an OpenID authentication
 951  */
 952 void cmd_oidf(char *argbuf) {
 953         long len;
 954         char buf[2048];
 955         char thiskey[1024];
 956         char thisdata[1024];
 957         HashList *keys = NULL;
 958         ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
 959
 960         if (oiddata == NULL) {
 961                 cprintf("%d run OIDS first.\n", ERROR + INTERNAL_ERROR);
 962                 return;
 963         }
 964         if (StrLength(oiddata->server) == 0){
 965                 cprintf("%d need a remote server to authenticate against\n", ERROR + ILLEGAL_VALUE);
 966                 return;
 967         }
 968         keys = NewHash(1, NULL);
 969         if (!keys) {
 970                 cprintf("%d NewHash() failed\n", ERROR + INTERNAL_ERROR);
 971                 return;
 972         }
 973         cprintf("%d Transmit OpenID data now\n", START_CHAT_MODE);
 974
 975         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 976                 len = extract_token(thiskey, buf, 0, '|', sizeof thiskey);
 977                 if (len < 0)
 978                         len = sizeof(thiskey) - 1;
 979                 extract_token(thisdata, buf, 1, '|', sizeof thisdata);
 980                 syslog(LOG_DEBUG, "%s: ["SIZE_T_FMT"] %s", thiskey, strlen(thisdata), thisdata);
 981                 Put(keys, thiskey, len, strdup(thisdata), NULL);
 982         }
 983
 984
 985         /* Now that we have all of the parameters, we have to validate the signature against the server */
 986         syslog(LOG_DEBUG, "About to validate the signature...");
 987
 988         CURL *curl;
 989         CURLcode res;
 990         struct curl_httppost *formpost = NULL;
 991         struct curl_httppost *lastptr = NULL;
 992         char errmsg[1024] = "";
 993         char *o_assoc_handle = NULL;
 994         char *o_sig = NULL;
 995         char *o_signed = NULL;
 996         int num_signed_values;
 997         int i;
 998         char k_keyname[128];
 999         char k_o_keyname[128];
1000         char *k_value = NULL;
1001         StrBuf *ReplyBuf;
1002
1003         curl_formadd(&formpost, &lastptr,
1004                 CURLFORM_COPYNAME,      "openid.mode",
1005                 CURLFORM_COPYCONTENTS,  "check_authentication",
1006                 CURLFORM_END);
1007         syslog(LOG_DEBUG, "%25s : %s", "openid.mode", "check_authentication");
1008
1009         if (GetHash(keys, "assoc_handle", 12, (void *) &o_assoc_handle)) {
1010                 curl_formadd(&formpost, &lastptr,
1011                         CURLFORM_COPYNAME,      "openid.assoc_handle",
1012                         CURLFORM_COPYCONTENTS,  o_assoc_handle,
1013                         CURLFORM_END);
1014                 syslog(LOG_DEBUG, "%25s : %s", "openid.assoc_handle", o_assoc_handle);
1015         }
1016
1017         if (GetHash(keys, "sig", 3, (void *) &o_sig)) {
1018                 curl_formadd(&formpost, &lastptr,
1019                         CURLFORM_COPYNAME,      "openid.sig",
1020                         CURLFORM_COPYCONTENTS,  o_sig,
1021                         CURLFORM_END);
1022                         syslog(LOG_DEBUG, "%25s : %s", "openid.sig", o_sig);
1023         }
1024
1025         if (GetHash(keys, "signed", 6, (void *) &o_signed)) {
1026                 curl_formadd(&formpost, &lastptr,
1027                         CURLFORM_COPYNAME,      "openid.signed",
1028                         CURLFORM_COPYCONTENTS,  o_signed,
1029                         CURLFORM_END);
1030                 syslog(LOG_DEBUG, "%25s : %s", "openid.signed", o_signed);
1031
1032                 num_signed_values = num_tokens(o_signed, ',');
1033                 for (i=0; i<num_signed_values; ++i) {
1034                         extract_token(k_keyname, o_signed, i, ',', sizeof k_keyname);
1035                         if (strcasecmp(k_keyname, "mode")) {    // work around phpMyID bug
1036                                 if (GetHash(keys, k_keyname, strlen(k_keyname), (void *) &k_value)) {
1037                                         snprintf(k_o_keyname, sizeof k_o_keyname, "openid.%s", k_keyname);
1038                                         curl_formadd(&formpost, &lastptr,
1039                                                 CURLFORM_COPYNAME,      k_o_keyname,
1040                                                 CURLFORM_COPYCONTENTS,  k_value,
1041                                                 CURLFORM_END);
1042                                         syslog(LOG_DEBUG, "%25s : %s", k_o_keyname, k_value);
1043                                 }
1044                                 else {
1045                                         syslog(LOG_INFO, "OpenID: signed field '%s' is missing",
1046                                                 k_keyname);
1047                                 }
1048                         }
1049                 }
1050         }
1051
1052         ReplyBuf = NewStrBuf();
1053
1054         curl = ctdl_openid_curl_easy_init(errmsg);
1055         curl_easy_setopt(curl, CURLOPT_URL, ChrPtr(oiddata->server));
1056         curl_easy_setopt(curl, CURLOPT_WRITEDATA, ReplyBuf);
1057         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, CurlFillStrBuf_callback);
1058         curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
1059
1060         res = curl_easy_perform(curl);
1061         if (res) {
1062                 syslog(LOG_DEBUG, "cmd_oidf() libcurl error %d: %s", res, errmsg);
1063         }
1064         curl_easy_cleanup(curl);
1065         curl_formfree(formpost);
1066
1067         if (cbmstrcasestr(ChrPtr(ReplyBuf), "is_valid:true")) {
1068                 oiddata->verified = 1;
1069         }
1070         FreeStrBuf(&ReplyBuf);
1071
1072         syslog(LOG_DEBUG, "Authentication %s.", (oiddata->verified ? "succeeded" : "failed") );
1073
1074         /* Respond to the client */
1075
1076         if (oiddata->verified) {
1077
1078                 /* If we were already logged in, attach the OpenID to the user's account */
1079                 if (CC->logged_in) {
1080                         if (attach_openid(&CC->user, oiddata->claimed_id) == 0) {
1081                                 cprintf("attach\n");
1082                                 syslog(LOG_DEBUG, "OpenID attach succeeded");
1083                         }
1084                         else {
1085                                 cprintf("fail\n");
1086                                 syslog(LOG_DEBUG, "OpenID attach failed");
1087                         }
1088                 }
1089
1090                 /* Otherwise, a user is attempting to log in using the verified OpenID */
1091                 else {
1092                         /*
1093                          * Existing user who has claimed this OpenID?
1094                          *
1095                          * Note: if you think that sending the password back over the wire is insecure,
1096                          * check your assumptions.  If someone has successfully asserted an OpenID that
1097                          * is associated with the account, they already have password equivalency and can
1098                          * login, so they could just as easily change the password, etc.
1099                          */
1100                         if (login_via_openid(oiddata->claimed_id) == 0) {
1101                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
1102                                 logged_in_response();
1103                                 syslog(LOG_DEBUG, "Logged in using previously claimed OpenID");
1104                         }
1105
1106                         /*
1107                          * If this system does not allow self-service new user registration, the
1108                          * remaining modes do not apply, so fail here and now.
1109                          */
1110                         else if (config.c_disable_newu) {
1111                                 cprintf("fail\n");
1112                                 syslog(LOG_DEBUG, "Creating user failed due to local policy");
1113                         }
1114
1115                         /*
1116                          * New user whose OpenID is verified and Simple Registration Extension is in use?
1117                          */
1118                         else if (openid_create_user_via_sreg(oiddata->claimed_id, keys) == 0) {
1119                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
1120                                 logged_in_response();
1121                                 syslog(LOG_DEBUG, "Successfully auto-created new user");
1122                         }
1123
1124                         /*
1125                          * OpenID is verified, but the desired username either was not specified or
1126                          * conflicts with an existing user.  Manual account creation is required.
1127                          */
1128                         else {
1129                                 char *desired_name = NULL;
1130                                 cprintf("verify_only\n");
1131                                 cprintf("%s\n", ChrPtr(oiddata->claimed_id));
1132                                 if (GetHash(keys, "sreg.nickname", 13, (void *) &desired_name)) {
1133                                         cprintf("%s\n", desired_name);
1134                                 }
1135                                 else {
1136                                         cprintf("\n");
1137                                 }
1138                                 syslog(LOG_DEBUG, "The desired Simple Registration name is already taken.");
1139                         }
1140                 }
1141         }
1142         else {
1143                 cprintf("fail\n");
1144         }
1145         cprintf("000\n");
1146
1147         if (oiddata->sreg_keys != NULL) {
1148                 DeleteHash(&oiddata->sreg_keys);
1149                 oiddata->sreg_keys = NULL;
1150         }
1151         oiddata->sreg_keys = keys;
1152 }
1153
1154
1155
1156 /**************************************************************************/
1157 /*                                                                        */
1158 /* Functions in this section handle module initialization and shutdown    */
1159 /*                                                                        */
1160 /**************************************************************************/
1161
1162
1163
1164
1165 CTDL_MODULE_INIT(openid_rp)
1166 {
1167         if (!threading) {
1168                 curl_global_init(CURL_GLOBAL_ALL);
1169
1170                 /* Only enable the OpenID command set when native mode authentication is in use. */
1171                 if (config.c_auth_mode == AUTHMODE_NATIVE) {
1172                         CtdlRegisterProtoHook(cmd_oids, "OIDS", "Setup OpenID authentication");
1173                         CtdlRegisterProtoHook(cmd_oidf, "OIDF", "Finalize OpenID authentication");
1174                         CtdlRegisterProtoHook(cmd_oidl, "OIDL", "List OpenIDs associated with an account");
1175                         CtdlRegisterProtoHook(cmd_oidd, "OIDD", "Detach an OpenID from an account");
1176                         CtdlRegisterProtoHook(cmd_oidc, "OIDC", "Create new user after validating OpenID");
1177                         CtdlRegisterProtoHook(cmd_oida, "OIDA", "List all OpenIDs in the database");
1178                 }
1179                 CtdlRegisterSessionHook(openid_cleanup_function, EVT_LOGOUT);
1180                 CtdlRegisterUserHook(openid_purge, EVT_PURGEUSER);
1181                 openid_level_supported = 1;     /* This module supports OpenID 1.0 only */
1182         }
1183
1184         /* return our module name for the log */
1185         return "openid_rp";
1186 }