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  * Copyright (c) 2007-2011 by the citadel.org team
   5  *
   6  * This program is open source 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, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "sysdep.h"
  21 #include <stdlib.h>
  22 #include <unistd.h>
  23 #include <stdio.h>
  24 #include <fcntl.h>
  25 #include <signal.h>
  26 #include <pwd.h>
  27 #include <errno.h>
  28 #include <sys/types.h>
  29
  30 #if TIME_WITH_SYS_TIME
  31 # include <sys/time.h>
  32 # include <time.h>
  33 #else
  34 # if HAVE_SYS_TIME_H
  35 #  include <sys/time.h>
  36 # else
  37 #  include <time.h>
  38 # endif
  39 #endif
  40
  41 #include <sys/wait.h>
  42 #include <string.h>
  43 #include <limits.h>
  44 #include <curl/curl.h>
  45 #include <expat.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");
  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", ChrPtr(claimed_id));
 129                         return(0);
 130                 }
 131                 else {
 132                         syslog(LOG_INFO, "%s already belongs to another user", 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         cdb_rewind(CDB_OPENID);
 174         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 175                 if (cdboi->len > sizeof(long)) {
 176                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 177                         if (usernum == usbuf->usernum) {
 178                                 deleteme = strdup(cdboi->ptr + sizeof(long)),
 179                                 Put(keys, deleteme, strlen(deleteme), deleteme, NULL);
 180                         }
 181                 }
 182                 cdb_free(cdboi);
 183         }
 184
 185         /* Go through the hash list, deleting keys we stored in it */
 186
 187         HashPos = GetNewHashPos(keys, 0);
 188         while (GetNextHashPos(keys, HashPos, &len, &Key, &Value)!=0)
 189         {
 190                 syslog(LOG_DEBUG, "Deleting associated OpenID <%s>", (char*)Value);
 191                 cdb_delete(CDB_OPENID, Value, strlen(Value));
 192                 /* note: don't free(Value) -- deleting the hash list will handle this for us */
 193         }
 194         DeleteHashPos(&HashPos);
 195         DeleteHash(&keys);
 196 }
 197
 198
 199 /*
 200  * List the OpenIDs associated with the currently logged in account
 201  */
 202 void cmd_oidl(char *argbuf) {
 203         struct cdbdata *cdboi;
 204         long usernum = 0L;
 205
 206         if (CtdlAccessCheck(ac_logged_in)) return;
 207         cdb_rewind(CDB_OPENID);
 208         cprintf("%d Associated OpenIDs:\n", LISTING_FOLLOWS);
 209
 210         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 211                 if (cdboi->len > sizeof(long)) {
 212                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 213                         if (usernum == CC->user.usernum) {
 214                                 cprintf("%s\n", cdboi->ptr + sizeof(long));
 215                         }
 216                 }
 217                 cdb_free(cdboi);
 218         }
 219         cprintf("000\n");
 220 }
 221
 222
 223 /*
 224  * List ALL OpenIDs in the database
 225  */
 226 void cmd_oida(char *argbuf) {
 227         struct cdbdata *cdboi;
 228         long usernum;
 229         struct ctdluser usbuf;
 230
 231         if (CtdlAccessCheck(ac_aide)) return;
 232         cdb_rewind(CDB_OPENID);
 233         cprintf("%d List of all OpenIDs in the database:\n", LISTING_FOLLOWS);
 234
 235         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 236                 if (cdboi->len > sizeof(long)) {
 237                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 238                         if (CtdlGetUserByNumber(&usbuf, usernum) != 0) {
 239                                 usbuf.fullname[0] = 0;
 240                         }
 241                         cprintf("%s|%ld|%s\n",
 242                                 cdboi->ptr + sizeof(long),
 243                                 usernum,
 244                                 usbuf.fullname
 245                         );
 246                 }
 247                 cdb_free(cdboi);
 248         }
 249         cprintf("000\n");
 250 }
 251
 252
 253 /*
 254  * Attempt to register (populate the vCard) the currently-logged-in user
 255  * using the data from Simple Registration Extension, if present.
 256  */
 257 void populate_vcard_from_sreg(HashList *sreg_keys) {
 258
 259         struct vCard *v;
 260         int pop = 0;                    /* number of fields populated */
 261         char *data = NULL;
 262         char *postcode = NULL;
 263         char *country = NULL;
 264
 265         if (!sreg_keys) return;
 266         v = vcard_new();
 267         if (!v) return;
 268
 269         if (GetHash(sreg_keys, "identity", 8, (void *) &data)) {
 270                 vcard_add_prop(v, "url;type=openid", data);
 271                 ++pop;
 272         }
 273
 274         if (GetHash(sreg_keys, "sreg.email", 10, (void *) &data)) {
 275                 vcard_add_prop(v, "email;internet", data);
 276                 ++pop;
 277         }
 278
 279         if (GetHash(sreg_keys, "sreg.nickname", 13, (void *) &data)) {
 280                 vcard_add_prop(v, "nickname", data);
 281                 ++pop;
 282         }
 283
 284         if (GetHash(sreg_keys, "sreg.fullname", 13, (void *) &data)) {
 285                 char n[256];
 286                 vcard_add_prop(v, "fn", data);
 287                 vcard_fn_to_n(n, data, sizeof n);
 288                 vcard_add_prop(v, "n", n);
 289                 ++pop;
 290         }
 291
 292         if (!GetHash(sreg_keys, "sreg.postcode", 13, (void *) &postcode)) {
 293                 postcode = NULL;
 294         }
 295
 296         if (!GetHash(sreg_keys, "sreg.country", 12, (void *) &country)) {
 297                 country = NULL;
 298         }
 299
 300         if (postcode || country) {
 301                 char adr[256];
 302                 snprintf(adr, sizeof adr, ";;;;;%s;%s",
 303                         (postcode ? postcode : ""),
 304                         (country ? country : "")
 305                 );
 306                 vcard_add_prop(v, "adr", adr);
 307                 ++pop;
 308         }
 309
 310         if (GetHash(sreg_keys, "sreg.dob", 8, (void *) &data)) {
 311                 vcard_add_prop(v, "bday", data);
 312                 ++pop;
 313         }
 314
 315         if (GetHash(sreg_keys, "sreg.gender", 11, (void *) &data)) {
 316                 vcard_add_prop(v, "x-funambol-gender", data);
 317                 ++pop;
 318         }
 319
 320         /* Only save the vCard if there is some useful data in it */
 321         if (pop > 0) {
 322                 char *ser;
 323                 ser = vcard_serialize(v);
 324                 if (ser) {
 325                         CtdlWriteObject(USERCONFIGROOM, "text/x-vcard",
 326                                 ser, strlen(ser)+1, &CC->user, 0, 0, 0
 327                         );
 328                         free(ser);
 329                 }
 330         }
 331         vcard_free(v);
 332 }
 333
 334
 335 /*
 336  * Create a new user account, manually specifying the name, after successfully
 337  * verifying an OpenID (which will of course be attached to the account)
 338  */
 339 void cmd_oidc(char *argbuf) {
 340         ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
 341
 342         if (!oiddata) {
 343                 cprintf("%d You have not verified an OpenID yet.\n", ERROR);
 344                 return;
 345         }
 346
 347         if (!oiddata->verified) {
 348                 cprintf("%d You have not verified an OpenID yet.\n", ERROR);
 349                 return;
 350         }
 351
 352         /* We can make the semantics of OIDC exactly the same as NEWU, simply
 353          * by _calling_ cmd_newu() and letting it run.  Very clever!
 354          */
 355         cmd_newu(argbuf);
 356
 357         /* Now, if this logged us in, we have to attach the OpenID */
 358         if (CC->logged_in) {
 359                 attach_openid(&CC->user, oiddata->claimed_id);
 360                 if (oiddata->sreg_keys != NULL) {
 361                         populate_vcard_from_sreg(oiddata->sreg_keys);
 362                 }
 363         }
 364
 365 }
 366
 367
 368 /*
 369  * Detach an OpenID from the currently logged in account
 370  */
 371 void cmd_oidd(char *argbuf) {
 372         struct cdbdata *cdboi;
 373         char id_to_detach[1024];
 374         int this_is_mine = 0;
 375         long usernum = 0L;
 376
 377         if (CtdlAccessCheck(ac_logged_in)) return;
 378         extract_token(id_to_detach, argbuf, 0, '|', sizeof id_to_detach);
 379         if (IsEmptyStr(id_to_detach)) {
 380                 cprintf("%d An empty OpenID URL is not allowed.\n", ERROR + ILLEGAL_VALUE);
 381         }
 382
 383         cdb_rewind(CDB_OPENID);
 384         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 385                 if (cdboi->len > sizeof(long)) {
 386                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 387                         if (usernum == CC->user.usernum) {
 388                                 this_is_mine = 1;
 389                         }
 390                 }
 391                 cdb_free(cdboi);
 392         }
 393
 394         if (!this_is_mine) {
 395                 cprintf("%d That OpenID was not found or not associated with your account.\n",
 396                         ERROR + ILLEGAL_VALUE);
 397                 return;
 398         }
 399
 400         cdb_delete(CDB_OPENID, id_to_detach, strlen(id_to_detach));
 401         cprintf("%d %s detached from your account.\n", CIT_OK, id_to_detach);
 402 }
 403
 404
 405
 406 /*
 407  * Attempt to auto-create a new Citadel account using the nickname from Simple Registration Extension
 408  */
 409 int openid_create_user_via_sreg(StrBuf *claimed_id, HashList *sreg_keys)
 410 {
 411         char *desired_name = NULL;
 412         char new_password[32];
 413         long len;
 414
 415         if (config.c_auth_mode != AUTHMODE_NATIVE) return(1);
 416         if (config.c_disable_newu) return(2);
 417         if (CC->logged_in) return(3);
 418         if (!GetHash(sreg_keys, "sreg.nickname", 13, (void *) &desired_name)) return(4);
 419
 420         syslog(LOG_DEBUG, "The desired account name is <%s>", desired_name);
 421
 422         len = cutuserkey(desired_name);
 423         if (!CtdlGetUser(&CC->user, desired_name)) {
 424                 syslog(LOG_DEBUG, "<%s> is already taken by another user.", desired_name);
 425                 memset(&CC->user, 0, sizeof(struct ctdluser));
 426                 return(5);
 427         }
 428
 429         /* The desired account name is available.  Create the account and log it in! */
 430         if (create_user(desired_name, len, 1)) return(6);
 431
 432         snprintf(new_password, sizeof new_password, "%08lx%08lx", random(), random());
 433         CtdlSetPassword(new_password);
 434         attach_openid(&CC->user, claimed_id);
 435         populate_vcard_from_sreg(sreg_keys);
 436         return(0);
 437 }
 438
 439
 440 /*
 441  * If a user account exists which is associated with the Claimed ID, log it in and return zero.
 442  * Otherwise it returns nonzero.
 443  */
 444 int login_via_openid(StrBuf *claimed_id)
 445 {
 446         struct cdbdata *cdboi;
 447         long usernum = 0;
 448
 449         cdboi = cdb_fetch(CDB_OPENID, ChrPtr(claimed_id), StrLength(claimed_id));
 450         if (cdboi == NULL) {
 451                 return(-1);
 452         }
 453
 454         memcpy(&usernum, cdboi->ptr, sizeof(long));
 455         cdb_free(cdboi);
 456
 457         if (!CtdlGetUserByNumber(&CC->user, usernum)) {
 458                 /* Now become the user we just created */
 459                 safestrncpy(CC->curr_user, CC->user.fullname, sizeof CC->curr_user);
 460                 do_login();
 461                 return(0);
 462         }
 463         else {
 464                 memset(&CC->user, 0, sizeof(struct ctdluser));
 465                 return(-1);
 466         }
 467 }
 468
 469
 470
 471
 472 /**************************************************************************/
 473 /*                                                                        */
 474 /* Functions in this section handle OpenID protocol                       */
 475 /*                                                                        */
 476 /**************************************************************************/
 477
 478
 479 /*
 480  * Locate a <link> tag and, given its 'rel=' parameter, return its 'href' parameter
 481  */
 482 void extract_link(StrBuf *target_buf, const char *rel, long repllen, StrBuf *source_buf)
 483 {
 484         int i;
 485         const char *ptr;
 486         const char *href_start = NULL;
 487         const char *href_end = NULL;
 488         const char *link_tag_start = NULL;
 489         const char *link_tag_end = NULL;
 490         const char *rel_start = NULL;
 491         const char *rel_end = NULL;
 492
 493         if (!target_buf) return;
 494         if (!rel) return;
 495         if (!source_buf) return;
 496
 497         ptr = ChrPtr(source_buf);
 498
 499         FlushStrBuf(target_buf);
 500         while (ptr = cbmstrcasestr(ptr, "<link"), ptr != NULL) {
 501
 502                 link_tag_start = ptr;
 503                 link_tag_end = strchr(ptr, '>');
 504                 if (link_tag_end == NULL)
 505                         break;
 506                 for (i=0; i < 1; i++ ){
 507                         rel_start = cbmstrcasestr(link_tag_start, "rel=");
 508                         if ((rel_start == NULL) ||
 509                             (rel_start > link_tag_end))
 510                                 continue;
 511
 512                         rel_start = strchr(rel_start, '\"');
 513                         if ((rel_start == NULL) ||
 514                             (rel_start > link_tag_end))
 515                                 continue;
 516                         ++rel_start;
 517                         rel_end = strchr(rel_start, '\"');
 518                         if ((rel_end == NULL) ||
 519                             (rel_end == rel_start) ||
 520                             (rel_end >= link_tag_end) )
 521                                 continue;
 522                         if (strncasecmp(rel, rel_start, repllen)!= 0)
 523                                 continue; /* didn't match? never mind... */
 524
 525                         href_start = cbmstrcasestr(link_tag_start, "href=");
 526                         if ((href_start == NULL) ||
 527                             (href_start >= link_tag_end))
 528                                 continue;
 529                         href_start = strchr(href_start, '\"');
 530                         if ((href_start == NULL) |
 531                             (href_start >= link_tag_end))
 532                                 continue;
 533                         ++href_start;
 534                         href_end = strchr(href_start, '\"');
 535                         if ((href_end == NULL) ||
 536                             (href_end == href_start) ||
 537                             (href_start >= link_tag_end))
 538                                 continue;
 539                         StrBufPlain(target_buf, href_start, href_end - href_start);
 540                 }
 541                 ptr = link_tag_end;
 542         }
 543 }
 544
 545
 546 /*
 547  * Wrapper for curl_easy_init() that includes the options common to all calls
 548  * used in this module.
 549  */
 550 CURL *ctdl_openid_curl_easy_init(char *errmsg) {
 551         CURL *curl;
 552
 553         curl = curl_easy_init();
 554         if (!curl) {
 555                 return(curl);
 556         }
 557
 558         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 559         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 560
 561         if (errmsg) {
 562                 curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
 563         }
 564         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 565 #ifdef CURLOPT_HTTP_CONTENT_DECODING
 566         curl_easy_setopt(curl, CURLOPT_HTTP_CONTENT_DECODING, 1);
 567         curl_easy_setopt(curl, CURLOPT_ENCODING, "");
 568 #endif
 569         curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
 570         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 180);           /* die after 180 seconds */
 571
 572         if (
 573                 (!IsEmptyStr(config.c_ip_addr))
 574                 && (strcmp(config.c_ip_addr, "*"))
 575                 && (strcmp(config.c_ip_addr, "::"))
 576                 && (strcmp(config.c_ip_addr, "0.0.0.0"))
 577         ) {
 578                 curl_easy_setopt(curl, CURLOPT_INTERFACE, config.c_ip_addr);
 579         }
 580
 581         return(curl);
 582 }
 583
 584
 585 /*
 586  * Begin an HTTP fetch (returns number of bytes actually fetched, or -1 for error) using libcurl.
 587  */
 588 int fetch_http(StrBuf *url, StrBuf **target_buf)
 589 {
 590         StrBuf *ReplyBuf;
 591         CURL *curl;
 592         CURLcode result;
 593         char *effective_url = NULL;
 594         char errmsg[1024] = "";
 595
 596         if (StrLength(url) <=0 ) return(-1);
 597         ReplyBuf = *target_buf = NewStrBuf ();
 598         if (ReplyBuf == 0) return(-1);
 599
 600         curl = ctdl_openid_curl_easy_init(errmsg);
 601         if (!curl) return(-1);
 602
 603         curl_easy_setopt(curl, CURLOPT_URL, ChrPtr(url));
 604         curl_easy_setopt(curl, CURLOPT_WRITEDATA, ReplyBuf);
 605         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, CurlFillStrBuf_callback);
 606
 607         result = curl_easy_perform(curl);
 608         if (result) {
 609                 syslog(LOG_DEBUG, "libcurl error %d: %s", result, errmsg);
 610         }
 611         curl_easy_getinfo(curl, CURLINFO_EFFECTIVE_URL, &effective_url);
 612         StrBufPlain(url, effective_url, -1);
 613
 614         curl_easy_cleanup(curl);
 615         return StrLength(ReplyBuf);
 616 }
 617
 618
 619
 620 struct xrds {
 621         int nesting_level;
 622         int in_xrd;
 623         int current_service_priority;
 624         int selected_service_priority;  /* more here later */
 625 };
 626
 627
 628 void xrds_xml_start(void *data, const char *supplied_el, const char **attr) {
 629         struct xrds *xrds = (struct xrds *) data;
 630         int i;
 631
 632         ++xrds->nesting_level;
 633
 634         if (!strcasecmp(supplied_el, "XRD")) {
 635                 ++xrds->in_xrd;
 636                 syslog(LOG_DEBUG, "*** XRD CONTAINER BEGIN ***");
 637         }
 638
 639         else if (!strcasecmp(supplied_el, "service")) {
 640                 xrds->current_service_priority = 0;
 641                 for (i=0; attr[i] != NULL; i+=2) {
 642                         if (!strcasecmp(attr[i], "priority")) {
 643                                 xrds->current_service_priority = atoi(attr[i+1]);
 644                         }
 645                 }
 646         }
 647 }
 648
 649
 650 void xrds_xml_end(void *data, const char *supplied_el) {
 651         struct xrds *xrds = (struct xrds *) data;
 652
 653         --xrds->nesting_level;
 654
 655         if (!strcasecmp(supplied_el, "XRD")) {
 656                 --xrds->in_xrd;
 657                 syslog(LOG_DEBUG, "*** XRD CONTAINER END ***");
 658         }
 659
 660         else if (!strcasecmp(supplied_el, "service")) {
 661                 /* this is where we should evaluate the service and do stuff */
 662                 xrds->current_service_priority = 0;
 663         }
 664 }
 665
 666
 667 void xrds_xml_chardata(void *data, const XML_Char *s, int len) {
 668         struct xrds *xrds = (struct xrds *) data;
 669
 670         if (xrds) ;     /* this is only here to silence the warning for now */
 671
 672         /* StrBufAppendBufPlain (xrds->CData, s, len, 0); */
 673 }
 674
 675
 676 /*
 677  * Parse an XRDS document.
 678  * If OpenID stuff is discovered, populate FIXME something and return nonzero
 679  * If nothing useful happened, return 0.
 680  */
 681 int parse_xrds_document(StrBuf *ReplyBuf) {
 682         struct xrds xrds;
 683
 684         memset(&xrds, 0, sizeof (struct xrds));
 685         XML_Parser xp = XML_ParserCreate(NULL);
 686         if (xp) {
 687                 XML_SetUserData(xp, &xrds);
 688                 XML_SetElementHandler(xp, xrds_xml_start, xrds_xml_end);
 689                 XML_SetCharacterDataHandler(xp, xrds_xml_chardata);
 690                 XML_Parse(xp, ChrPtr(ReplyBuf), StrLength(ReplyBuf), 0);
 691                 XML_Parse(xp, "", 0, 1);
 692                 XML_ParserFree(xp);
 693         }
 694         else {
 695                 syslog(LOG_ALERT, "Cannot create XML parser");
 696         }
 697
 698         return(0);      /* FIXME return nonzero if something wonderful happened */
 699 }
 700
 701
 702 /* Attempt to perform Yadis discovery as specified in Yadis 1.0 section 6.2.5.
 703  * If successful, returns nonzero and calls parse_xrds_document() to act upon the received data.
 704  * If Yadis fails, returns 0 and does nothing else.
 705  */
 706 int perform_yadis_discovery(StrBuf *YadisURL) {
 707         int docbytes = (-1);
 708         StrBuf *ReplyBuf = NULL;
 709         int r;
 710         CURL *curl;
 711         CURLcode result;
 712         char errmsg[1024] = "";
 713         struct curl_slist *my_headers = NULL;
 714
 715         if (YadisURL == NULL) return(0);
 716         if (StrLength(YadisURL) == 0) return(0);
 717
 718         ReplyBuf = NewStrBuf ();
 719         if (ReplyBuf == 0) return(0);
 720
 721         curl = ctdl_openid_curl_easy_init(errmsg);
 722         if (!curl) return(0);
 723
 724         curl_easy_setopt(curl, CURLOPT_URL, ChrPtr(YadisURL));
 725         curl_easy_setopt(curl, CURLOPT_WRITEDATA, ReplyBuf);
 726         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, CurlFillStrBuf_callback);
 727
 728         my_headers = curl_slist_append(my_headers, "Accept:");  /* disable the default Accept: header */
 729         my_headers = curl_slist_append(my_headers, "Accept: application/xrds+xml");
 730         curl_easy_setopt(curl, CURLOPT_HTTPHEADER, my_headers);
 731
 732         result = curl_easy_perform(curl);
 733         if (result) {
 734                 syslog(LOG_DEBUG, "libcurl error %d: %s", result, errmsg);
 735         }
 736         curl_slist_free_all(my_headers);
 737         curl_easy_cleanup(curl);
 738
 739         docbytes = StrLength(ReplyBuf);
 740
 741         /* FIXME here we need to handle Yadis 1.0 section 6.2.5.
 742          *
 743          * The response from the server will be one of:
 744          *
 745          * Option 1: An HTML document with a <head> element that includes a <meta> element with http-equiv
 746          * attribute, X-XRDS-Location,
 747          *
 748          * Option 2: HTTP response-headers that include an X-XRDS-Location response-header, together with a
 749          * document (NOTE: we can probably recurse for this)
 750          *
 751          * Option 3:. HTTP response-headers only, which MAY include an X-XRDS-Location response-header,
 752          * a contenttype response-header specifying MIME media type, application/xrds+xml, or both.
 753          *
 754          */
 755
 756         /*
 757          * Option 4: the returned web page may *be* an XRDS document.  Try to parse it.
 758          */
 759         r = 0;
 760         if (docbytes >= 0) {
 761                 r = parse_xrds_document(ReplyBuf);
 762                 FreeStrBuf(&ReplyBuf);
 763         }
 764
 765         return(r);
 766 }
 767
 768
 769 /*
 770  * Setup an OpenID authentication
 771  */
 772 void cmd_oids(char *argbuf) {
 773         const char *Pos = NULL;
 774         StrBuf *ArgBuf = NULL;
 775         StrBuf *ReplyBuf = NULL;
 776         StrBuf *return_to = NULL;
 777         StrBuf *trust_root = NULL;
 778         StrBuf *openid_delegate = NULL;
 779         StrBuf *RedirectUrl = NULL;
 780         struct CitContext *CCC = CC;    /* CachedCitContext - performance boost */
 781         ctdl_openid *oiddata;
 782
 783         Free_ctdl_openid ((ctdl_openid**)&CCC->openid_data);
 784
 785         CCC->openid_data = oiddata = malloc(sizeof(ctdl_openid));
 786         if (oiddata == NULL) {
 787                 cprintf("%d malloc failed\n", ERROR + INTERNAL_ERROR);
 788                 return;
 789         }
 790         memset(oiddata, 0, sizeof(ctdl_openid));
 791         CCC->openid_data = (void *) oiddata;
 792
 793         ArgBuf = NewStrBufPlain(argbuf, -1);
 794
 795         oiddata->verified = 0;
 796         oiddata->claimed_id = NewStrBufPlain(NULL, StrLength(ArgBuf));
 797         trust_root = NewStrBufPlain(NULL, StrLength(ArgBuf));
 798         return_to = NewStrBufPlain(NULL, StrLength(ArgBuf));
 799
 800         StrBufExtract_NextToken(oiddata->claimed_id, ArgBuf, &Pos, '|');
 801         StrBufExtract_NextToken(return_to, ArgBuf, &Pos, '|');
 802         StrBufExtract_NextToken(trust_root, ArgBuf, &Pos, '|');
 803
 804         syslog(LOG_DEBUG, "User-Supplied Identifier is: %s", ChrPtr(oiddata->claimed_id));
 805
 806
 807         /********** OpenID 2.0 section 7.3 - Discovery **********/
 808
 809         /* First we're supposed to attempt XRI based resolution.
 810          * No one is using this, no one is asking for it, no one wants it.
 811          * So we're not even going to bother attempting this mode.
 812          */
 813
 814         /* Second we attempt Yadis.
 815          * Google uses this so we'd better do our best to implement it.
 816          */
 817         int yadis_succeeded = perform_yadis_discovery(oiddata->claimed_id);
 818
 819         /* Third we attempt HTML-based discovery.  Here we go! */
 820         if (    (yadis_succeeded == 0)
 821                 && (fetch_http(oiddata->claimed_id, &ReplyBuf) > 0)
 822                 && (StrLength(ReplyBuf) > 0)
 823         ) {
 824                 openid_delegate = NewStrBuf();
 825                 oiddata->server = NewStrBuf();
 826                 extract_link(oiddata->server, HKEY("openid.server"), ReplyBuf);
 827                 extract_link(openid_delegate, HKEY("openid.delegate"), ReplyBuf);
 828
 829                 if (StrLength(oiddata->server) == 0) {
 830                         cprintf("%d There is no OpenID identity provider at this URL.\n", ERROR);
 831                         FreeStrBuf(&ArgBuf);
 832                         FreeStrBuf(&ReplyBuf);
 833                         FreeStrBuf(&return_to);
 834                         FreeStrBuf(&trust_root);
 835                         FreeStrBuf(&openid_delegate);
 836                         FreeStrBuf(&RedirectUrl);
 837                         return;
 838                 }
 839
 840                 /* Empty delegate is legal; we just use the openid_url instead */
 841                 if (StrLength(openid_delegate) == 0) {
 842                         StrBufPlain(openid_delegate, SKEY(oiddata->claimed_id));
 843                 }
 844
 845                 /* Assemble a URL to which the user-agent will be redirected. */
 846
 847                 RedirectUrl = NewStrBufDup(oiddata->server);
 848
 849                 StrBufAppendBufPlain(RedirectUrl, HKEY("?openid.mode=checkid_setup"
 850                                                        "&openid.identity="), 0);
 851                 StrBufUrlescAppend(RedirectUrl, openid_delegate, NULL);
 852
 853                 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.return_to="), 0);
 854                 StrBufUrlescAppend(RedirectUrl, return_to, NULL);
 855
 856                 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.trust_root="), 0);
 857                 StrBufUrlescAppend(RedirectUrl, trust_root, NULL);
 858
 859                 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.sreg.optional="), 0);
 860                 StrBufUrlescAppend(RedirectUrl, NULL, "nickname,email,fullname,postcode,country,dob,gender");
 861
 862                 cprintf("%d %s\n", CIT_OK, ChrPtr(RedirectUrl));
 863
 864                 FreeStrBuf(&ArgBuf);
 865                 FreeStrBuf(&ReplyBuf);
 866                 FreeStrBuf(&return_to);
 867                 FreeStrBuf(&trust_root);
 868                 FreeStrBuf(&openid_delegate);
 869                 FreeStrBuf(&RedirectUrl);
 870
 871                 return;
 872         }
 873
 874         FreeStrBuf(&ArgBuf);
 875         FreeStrBuf(&ReplyBuf);
 876         FreeStrBuf(&return_to);
 877         FreeStrBuf(&trust_root);
 878         FreeStrBuf(&openid_delegate);
 879         FreeStrBuf(&RedirectUrl);
 880
 881         cprintf("%d Unable to fetch OpenID URL\n", ERROR);
 882 }
 883
 884
 885
 886
 887
 888 /*
 889  * Finalize an OpenID authentication
 890  */
 891 void cmd_oidf(char *argbuf) {
 892         long len;
 893         char buf[2048];
 894         char thiskey[1024];
 895         char thisdata[1024];
 896         HashList *keys = NULL;
 897         ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
 898
 899         if (oiddata == NULL) {
 900                 cprintf("%d run OIDS first.\n", ERROR + INTERNAL_ERROR);
 901                 return;
 902         }
 903         if (StrLength(oiddata->server) == 0){
 904                 cprintf("%d need a remote server to authenticate against\n", ERROR + ILLEGAL_VALUE);
 905                 return;
 906         }
 907         keys = NewHash(1, NULL);
 908         if (!keys) {
 909                 cprintf("%d NewHash() failed\n", ERROR + INTERNAL_ERROR);
 910                 return;
 911         }
 912         cprintf("%d Transmit OpenID data now\n", START_CHAT_MODE);
 913
 914         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 915                 len = extract_token(thiskey, buf, 0, '|', sizeof thiskey);
 916                 if (len < 0)
 917                         len = sizeof(thiskey) - 1;
 918                 extract_token(thisdata, buf, 1, '|', sizeof thisdata);
 919                 syslog(LOG_DEBUG, "%s: ["SIZE_T_FMT"] %s", thiskey, strlen(thisdata), thisdata);
 920                 Put(keys, thiskey, len, strdup(thisdata), NULL);
 921         }
 922
 923
 924         /* Now that we have all of the parameters, we have to validate the signature against the server */
 925         syslog(LOG_DEBUG, "About to validate the signature...");
 926
 927         CURL *curl;
 928         CURLcode res;
 929         struct curl_httppost *formpost = NULL;
 930         struct curl_httppost *lastptr = NULL;
 931         char errmsg[1024] = "";
 932         char *o_assoc_handle = NULL;
 933         char *o_sig = NULL;
 934         char *o_signed = NULL;
 935         int num_signed_values;
 936         int i;
 937         char k_keyname[128];
 938         char k_o_keyname[128];
 939         char *k_value = NULL;
 940         StrBuf *ReplyBuf;
 941
 942         curl_formadd(&formpost, &lastptr,
 943                 CURLFORM_COPYNAME,      "openid.mode",
 944                 CURLFORM_COPYCONTENTS,  "check_authentication",
 945                 CURLFORM_END);
 946         syslog(LOG_DEBUG, "%25s : %s", "openid.mode", "check_authentication");
 947
 948         if (GetHash(keys, "assoc_handle", 12, (void *) &o_assoc_handle)) {
 949                 curl_formadd(&formpost, &lastptr,
 950                         CURLFORM_COPYNAME,      "openid.assoc_handle",
 951                         CURLFORM_COPYCONTENTS,  o_assoc_handle,
 952                         CURLFORM_END);
 953                 syslog(LOG_DEBUG, "%25s : %s", "openid.assoc_handle", o_assoc_handle);
 954         }
 955
 956         if (GetHash(keys, "sig", 3, (void *) &o_sig)) {
 957                 curl_formadd(&formpost, &lastptr,
 958                         CURLFORM_COPYNAME,      "openid.sig",
 959                         CURLFORM_COPYCONTENTS,  o_sig,
 960                         CURLFORM_END);
 961                         syslog(LOG_DEBUG, "%25s : %s", "openid.sig", o_sig);
 962         }
 963
 964         if (GetHash(keys, "signed", 6, (void *) &o_signed)) {
 965                 curl_formadd(&formpost, &lastptr,
 966                         CURLFORM_COPYNAME,      "openid.signed",
 967                         CURLFORM_COPYCONTENTS,  o_signed,
 968                         CURLFORM_END);
 969                 syslog(LOG_DEBUG, "%25s : %s", "openid.signed", o_signed);
 970
 971                 num_signed_values = num_tokens(o_signed, ',');
 972                 for (i=0; i<num_signed_values; ++i) {
 973                         extract_token(k_keyname, o_signed, i, ',', sizeof k_keyname);
 974                         if (strcasecmp(k_keyname, "mode")) {    // work around phpMyID bug
 975                                 if (GetHash(keys, k_keyname, strlen(k_keyname), (void *) &k_value)) {
 976                                         snprintf(k_o_keyname, sizeof k_o_keyname, "openid.%s", k_keyname);
 977                                         curl_formadd(&formpost, &lastptr,
 978                                                 CURLFORM_COPYNAME,      k_o_keyname,
 979                                                 CURLFORM_COPYCONTENTS,  k_value,
 980                                                 CURLFORM_END);
 981                                         syslog(LOG_DEBUG, "%25s : %s", k_o_keyname, k_value);
 982                                 }
 983                                 else {
 984                                         syslog(LOG_INFO, "OpenID: signed field '%s' is missing",
 985                                                 k_keyname);
 986                                 }
 987                         }
 988                 }
 989         }
 990
 991         ReplyBuf = NewStrBuf();
 992
 993         curl = ctdl_openid_curl_easy_init(errmsg);
 994         curl_easy_setopt(curl, CURLOPT_URL, ChrPtr(oiddata->server));
 995         curl_easy_setopt(curl, CURLOPT_WRITEDATA, ReplyBuf);
 996         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, CurlFillStrBuf_callback);
 997         curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 998
 999         res = curl_easy_perform(curl);
1000         if (res) {
1001                 syslog(LOG_DEBUG, "cmd_oidf() libcurl error %d: %s", res, errmsg);
1002         }
1003         curl_easy_cleanup(curl);
1004         curl_formfree(formpost);
1005
1006         if (cbmstrcasestr(ChrPtr(ReplyBuf), "is_valid:true")) {
1007                 oiddata->verified = 1;
1008         }
1009         FreeStrBuf(&ReplyBuf);
1010
1011         syslog(LOG_DEBUG, "Authentication %s.", (oiddata->verified ? "succeeded" : "failed") );
1012
1013         /* Respond to the client */
1014
1015         if (oiddata->verified) {
1016
1017                 /* If we were already logged in, attach the OpenID to the user's account */
1018                 if (CC->logged_in) {
1019                         if (attach_openid(&CC->user, oiddata->claimed_id) == 0) {
1020                                 cprintf("attach\n");
1021                                 syslog(LOG_DEBUG, "OpenID attach succeeded");
1022                         }
1023                         else {
1024                                 cprintf("fail\n");
1025                                 syslog(LOG_DEBUG, "OpenID attach failed");
1026                         }
1027                 }
1028
1029                 /* Otherwise, a user is attempting to log in using the verified OpenID */
1030                 else {
1031                         /*
1032                          * Existing user who has claimed this OpenID?
1033                          *
1034                          * Note: if you think that sending the password back over the wire is insecure,
1035                          * check your assumptions.  If someone has successfully asserted an OpenID that
1036                          * is associated with the account, they already have password equivalency and can
1037                          * login, so they could just as easily change the password, etc.
1038                          */
1039                         if (login_via_openid(oiddata->claimed_id) == 0) {
1040                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
1041                                 logged_in_response();
1042                                 syslog(LOG_DEBUG, "Logged in using previously claimed OpenID");
1043                         }
1044
1045                         /*
1046                          * If this system does not allow self-service new user registration, the
1047                          * remaining modes do not apply, so fail here and now.
1048                          */
1049                         else if (config.c_disable_newu) {
1050                                 cprintf("fail\n");
1051                                 syslog(LOG_DEBUG, "Creating user failed due to local policy");
1052                         }
1053
1054                         /*
1055                          * New user whose OpenID is verified and Simple Registration Extension is in use?
1056                          */
1057                         else if (openid_create_user_via_sreg(oiddata->claimed_id, keys) == 0) {
1058                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
1059                                 logged_in_response();
1060                                 syslog(LOG_DEBUG, "Successfully auto-created new user");
1061                         }
1062
1063                         /*
1064                          * OpenID is verified, but the desired username either was not specified or
1065                          * conflicts with an existing user.  Manual account creation is required.
1066                          */
1067                         else {
1068                                 char *desired_name = NULL;
1069                                 cprintf("verify_only\n");
1070                                 cprintf("%s\n", ChrPtr(oiddata->claimed_id));
1071                                 if (GetHash(keys, "sreg.nickname", 13, (void *) &desired_name)) {
1072                                         cprintf("%s\n", desired_name);
1073                                 }
1074                                 else {
1075                                         cprintf("\n");
1076                                 }
1077                                 syslog(LOG_DEBUG, "The desired Simple Registration name is already taken.");
1078                         }
1079                 }
1080         }
1081         else {
1082                 cprintf("fail\n");
1083         }
1084         cprintf("000\n");
1085
1086         if (oiddata->sreg_keys != NULL) {
1087                 DeleteHash(&oiddata->sreg_keys);
1088                 oiddata->sreg_keys = NULL;
1089         }
1090         oiddata->sreg_keys = keys;
1091 }
1092
1093
1094
1095 /**************************************************************************/
1096 /*                                                                        */
1097 /* Functions in this section handle module initialization and shutdown    */
1098 /*                                                                        */
1099 /**************************************************************************/
1100
1101
1102
1103
1104 CTDL_MODULE_INIT(openid_rp)
1105 {
1106         if (!threading) {
1107                 curl_global_init(CURL_GLOBAL_ALL);
1108
1109                 /* Only enable the OpenID command set when native mode authentication is in use. */
1110                 if (config.c_auth_mode == AUTHMODE_NATIVE) {
1111                         CtdlRegisterProtoHook(cmd_oids, "OIDS", "Setup OpenID authentication");
1112                         CtdlRegisterProtoHook(cmd_oidf, "OIDF", "Finalize OpenID authentication");
1113                         CtdlRegisterProtoHook(cmd_oidl, "OIDL", "List OpenIDs associated with an account");
1114                         CtdlRegisterProtoHook(cmd_oidd, "OIDD", "Detach an OpenID from an account");
1115                         CtdlRegisterProtoHook(cmd_oidc, "OIDC", "Create new user after validating OpenID");
1116                         CtdlRegisterProtoHook(cmd_oida, "OIDA", "List all OpenIDs in the database");
1117                 }
1118                 CtdlRegisterSessionHook(openid_cleanup_function, EVT_LOGOUT);
1119                 CtdlRegisterUserHook(openid_purge, EVT_PURGEUSER);
1120                 openid_level_supported = 1;     /* This module supports OpenID 1.0 only */
1121         }
1122
1123         /* return our module name for the log */
1124         return "openid_rp";
1125 }