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 -- NEEDS TO BE MERGEZ0RED !!!!!!111
   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 *op_url;                 /* OpenID Provider Endpoint URL */
  57         StrBuf *claimed_id;             /* Claimed Identifier */
  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         }
  67         FreeStrBuf(&(*FreeMe)->op_url);
  68         FreeStrBuf(&(*FreeMe)->claimed_id);
  69         DeleteHash(&(*FreeMe)->sreg_keys);
  70         free(*FreeMe);
  71         *FreeMe = NULL;
  72 }
  73
  74
  75 /*
  76  * This cleanup function blows away the temporary memory used by this module.
  77  */
  78 void openid_cleanup_function(void) {
  79         struct CitContext *CCC = CC;    /* CachedCitContext - performance boost */
  80
  81         if (CCC->openid_data != NULL) {
  82                 syslog(LOG_DEBUG, "Clearing OpenID session state");
  83                 Free_ctdl_openid((ctdl_openid **) &CCC->openid_data);
  84         }
  85 }
  86
  87
  88 /**************************************************************************/
  89 /*                                                                        */
  90 /* Functions in this section handle Citadel internal OpenID mapping stuff */
  91 /*                                                                        */
  92 /**************************************************************************/
  93
  94
  95 /*
  96  * The structure of an openid record *key* is:
  97  *
  98  * |--------------claimed_id-------------|
  99  *     (actual length of claimed id)
 100  *
 101  *
 102  * The structure of an openid record *value* is:
 103  *
 104  * |-----user_number----|------------claimed_id---------------|
 105  *    (sizeof long)          (actual length of claimed id)
 106  *
 107  */
 108
 109
 110
 111 /*
 112  * Attach an OpenID to a Citadel account
 113  */
 114 int attach_openid(struct ctdluser *who, StrBuf *claimed_id)
 115 {
 116         struct cdbdata *cdboi;
 117         long fetched_usernum;
 118         char *data;
 119         int data_len;
 120         char buf[2048];
 121
 122         if (!who) return(1);
 123         if (StrLength(claimed_id)==0) return(1);
 124
 125         /* Check to see if this OpenID is already in the database */
 126
 127         cdboi = cdb_fetch(CDB_OPENID, ChrPtr(claimed_id), StrLength(claimed_id));
 128         if (cdboi != NULL) {
 129                 memcpy(&fetched_usernum, cdboi->ptr, sizeof(long));
 130                 cdb_free(cdboi);
 131
 132                 if (fetched_usernum == who->usernum) {
 133                         syslog(LOG_INFO, "%s already associated; no action is taken", ChrPtr(claimed_id));
 134                         return(0);
 135                 }
 136                 else {
 137                         syslog(LOG_INFO, "%s already belongs to another user", ChrPtr(claimed_id));
 138                         return(3);
 139                 }
 140         }
 141
 142         /* Not already in the database, so attach it now */
 143
 144         data_len = sizeof(long) + StrLength(claimed_id) + 1;
 145         data = malloc(data_len);
 146
 147         memcpy(data, &who->usernum, sizeof(long));
 148         memcpy(&data[sizeof(long)], ChrPtr(claimed_id), StrLength(claimed_id) + 1);
 149
 150         cdb_store(CDB_OPENID, ChrPtr(claimed_id), StrLength(claimed_id), data, data_len);
 151         free(data);
 152
 153         snprintf(buf, sizeof buf, "User <%s> (#%ld) has claimed the OpenID URL %s\n",
 154                  who->fullname, who->usernum, ChrPtr(claimed_id));
 155         CtdlAideMessage(buf, "OpenID claim");
 156         syslog(LOG_INFO, "%s", buf);
 157         return(0);
 158 }
 159
 160
 161
 162 /*
 163  * When a user is being deleted, we have to delete any OpenID associations
 164  */
 165 void openid_purge(struct ctdluser *usbuf) {
 166         struct cdbdata *cdboi;
 167         HashList *keys = NULL;
 168         HashPos *HashPos;
 169         char *deleteme = NULL;
 170         long len;
 171         void *Value;
 172         const char *Key;
 173         long usernum = 0L;
 174
 175         keys = NewHash(1, NULL);
 176         if (!keys) return;
 177
 178         cdb_rewind(CDB_OPENID);
 179         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 180                 if (cdboi->len > sizeof(long)) {
 181                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 182                         if (usernum == usbuf->usernum) {
 183                                 deleteme = strdup(cdboi->ptr + sizeof(long)),
 184                                 Put(keys, deleteme, strlen(deleteme), deleteme, NULL);
 185                         }
 186                 }
 187                 cdb_free(cdboi);
 188         }
 189
 190         /* Go through the hash list, deleting keys we stored in it */
 191
 192         HashPos = GetNewHashPos(keys, 0);
 193         while (GetNextHashPos(keys, HashPos, &len, &Key, &Value)!=0)
 194         {
 195                 syslog(LOG_DEBUG, "Deleting associated OpenID <%s>", (char*)Value);
 196                 cdb_delete(CDB_OPENID, Value, strlen(Value));
 197                 /* note: don't free(Value) -- deleting the hash list will handle this for us */
 198         }
 199         DeleteHashPos(&HashPos);
 200         DeleteHash(&keys);
 201 }
 202
 203
 204 /*
 205  * List the OpenIDs associated with the currently logged in account
 206  */
 207 void cmd_oidl(char *argbuf) {
 208         struct cdbdata *cdboi;
 209         long usernum = 0L;
 210
 211         if (CtdlAccessCheck(ac_logged_in)) return;
 212         cdb_rewind(CDB_OPENID);
 213         cprintf("%d Associated OpenIDs:\n", LISTING_FOLLOWS);
 214
 215         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 216                 if (cdboi->len > sizeof(long)) {
 217                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 218                         if (usernum == CC->user.usernum) {
 219                                 cprintf("%s\n", cdboi->ptr + sizeof(long));
 220                         }
 221                 }
 222                 cdb_free(cdboi);
 223         }
 224         cprintf("000\n");
 225 }
 226
 227
 228 /*
 229  * List ALL OpenIDs in the database
 230  */
 231 void cmd_oida(char *argbuf) {
 232         struct cdbdata *cdboi;
 233         long usernum;
 234         struct ctdluser usbuf;
 235
 236         if (CtdlAccessCheck(ac_aide)) return;
 237         cdb_rewind(CDB_OPENID);
 238         cprintf("%d List of all OpenIDs in the database:\n", LISTING_FOLLOWS);
 239
 240         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 241                 if (cdboi->len > sizeof(long)) {
 242                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 243                         if (CtdlGetUserByNumber(&usbuf, usernum) != 0) {
 244                                 usbuf.fullname[0] = 0;
 245                         }
 246                         cprintf("%s|%ld|%s\n",
 247                                 cdboi->ptr + sizeof(long),
 248                                 usernum,
 249                                 usbuf.fullname
 250                         );
 251                 }
 252                 cdb_free(cdboi);
 253         }
 254         cprintf("000\n");
 255 }
 256
 257
 258 /*
 259  * Attempt to register (populate the vCard) the currently-logged-in user
 260  * using the data from Simple Registration Extension, if present.
 261  */
 262 void populate_vcard_from_sreg(HashList *sreg_keys) {
 263
 264         struct vCard *v;
 265         int pop = 0;                    /* number of fields populated */
 266         char *data = NULL;
 267         char *postcode = NULL;
 268         char *country = NULL;
 269
 270         if (!sreg_keys) return;
 271         v = vcard_new();
 272         if (!v) return;
 273
 274         if (GetHash(sreg_keys, "identity", 8, (void *) &data)) {
 275                 vcard_add_prop(v, "url;type=openid", data);
 276                 ++pop;
 277         }
 278
 279         if (GetHash(sreg_keys, "sreg.email", 10, (void *) &data)) {
 280                 vcard_add_prop(v, "email;internet", data);
 281                 ++pop;
 282         }
 283
 284         if (GetHash(sreg_keys, "sreg.nickname", 13, (void *) &data)) {
 285                 vcard_add_prop(v, "nickname", data);
 286                 ++pop;
 287         }
 288
 289         if (GetHash(sreg_keys, "sreg.fullname", 13, (void *) &data)) {
 290                 char n[256];
 291                 vcard_add_prop(v, "fn", data);
 292                 vcard_fn_to_n(n, data, sizeof n);
 293                 vcard_add_prop(v, "n", n);
 294                 ++pop;
 295         }
 296
 297         if (!GetHash(sreg_keys, "sreg.postcode", 13, (void *) &postcode)) {
 298                 postcode = NULL;
 299         }
 300
 301         if (!GetHash(sreg_keys, "sreg.country", 12, (void *) &country)) {
 302                 country = NULL;
 303         }
 304
 305         if (postcode || country) {
 306                 char adr[256];
 307                 snprintf(adr, sizeof adr, ";;;;;%s;%s",
 308                         (postcode ? postcode : ""),
 309                         (country ? country : "")
 310                 );
 311                 vcard_add_prop(v, "adr", adr);
 312                 ++pop;
 313         }
 314
 315         if (GetHash(sreg_keys, "sreg.dob", 8, (void *) &data)) {
 316                 vcard_add_prop(v, "bday", data);
 317                 ++pop;
 318         }
 319
 320         if (GetHash(sreg_keys, "sreg.gender", 11, (void *) &data)) {
 321                 vcard_add_prop(v, "x-funambol-gender", data);
 322                 ++pop;
 323         }
 324
 325         /* Only save the vCard if there is some useful data in it */
 326         if (pop > 0) {
 327                 char *ser;
 328                 ser = vcard_serialize(v);
 329                 if (ser) {
 330                         CtdlWriteObject(USERCONFIGROOM, "text/x-vcard",
 331                                 ser, strlen(ser)+1, &CC->user, 0, 0, 0
 332                         );
 333                         free(ser);
 334                 }
 335         }
 336         vcard_free(v);
 337 }
 338
 339
 340 /*
 341  * Create a new user account, manually specifying the name, after successfully
 342  * verifying an OpenID (which will of course be attached to the account)
 343  */
 344 void cmd_oidc(char *argbuf) {
 345         ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
 346
 347         if (!oiddata) {
 348                 cprintf("%d You have not verified an OpenID yet.\n", ERROR);
 349                 return;
 350         }
 351
 352         if (!oiddata->verified) {
 353                 cprintf("%d You have not verified an OpenID yet.\n", ERROR);
 354                 return;
 355         }
 356
 357         /* We can make the semantics of OIDC exactly the same as NEWU, simply
 358          * by _calling_ cmd_newu() and letting it run.  Very clever!
 359          */
 360         cmd_newu(argbuf);
 361
 362         /* Now, if this logged us in, we have to attach the OpenID */
 363         if (CC->logged_in) {
 364                 attach_openid(&CC->user, oiddata->claimed_id);
 365                 if (oiddata->sreg_keys != NULL) {
 366                         populate_vcard_from_sreg(oiddata->sreg_keys);
 367                 }
 368         }
 369
 370 }
 371
 372
 373 /*
 374  * Detach an OpenID from the currently logged in account
 375  */
 376 void cmd_oidd(char *argbuf) {
 377         struct cdbdata *cdboi;
 378         char id_to_detach[1024];
 379         int this_is_mine = 0;
 380         long usernum = 0L;
 381
 382         if (CtdlAccessCheck(ac_logged_in)) return;
 383         extract_token(id_to_detach, argbuf, 0, '|', sizeof id_to_detach);
 384         if (IsEmptyStr(id_to_detach)) {
 385                 cprintf("%d An empty OpenID URL is not allowed.\n", ERROR + ILLEGAL_VALUE);
 386         }
 387
 388         cdb_rewind(CDB_OPENID);
 389         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 390                 if (cdboi->len > sizeof(long)) {
 391                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 392                         if (usernum == CC->user.usernum) {
 393                                 this_is_mine = 1;
 394                         }
 395                 }
 396                 cdb_free(cdboi);
 397         }
 398
 399         if (!this_is_mine) {
 400                 cprintf("%d That OpenID was not found or not associated with your account.\n",
 401                         ERROR + ILLEGAL_VALUE);
 402                 return;
 403         }
 404
 405         cdb_delete(CDB_OPENID, id_to_detach, strlen(id_to_detach));
 406         cprintf("%d %s detached from your account.\n", CIT_OK, id_to_detach);
 407 }
 408
 409
 410
 411 /*
 412  * Attempt to auto-create a new Citadel account using the nickname from Simple Registration Extension
 413  */
 414 int openid_create_user_via_sreg(StrBuf *claimed_id, HashList *sreg_keys)
 415 {
 416         char *desired_name = NULL;
 417         char new_password[32];
 418         long len;
 419
 420         if (config.c_auth_mode != AUTHMODE_NATIVE) return(1);
 421         if (config.c_disable_newu) return(2);
 422         if (CC->logged_in) return(3);
 423         if (!GetHash(sreg_keys, "sreg.nickname", 13, (void *) &desired_name)) return(4);
 424
 425         syslog(LOG_DEBUG, "The desired account name is <%s>", desired_name);
 426
 427         len = cutuserkey(desired_name);
 428         if (!CtdlGetUser(&CC->user, desired_name)) {
 429                 syslog(LOG_DEBUG, "<%s> is already taken by another user.", desired_name);
 430                 memset(&CC->user, 0, sizeof(struct ctdluser));
 431                 return(5);
 432         }
 433
 434         /* The desired account name is available.  Create the account and log it in! */
 435         if (create_user(desired_name, len, 1)) return(6);
 436
 437         snprintf(new_password, sizeof new_password, "%08lx%08lx", random(), random());
 438         CtdlSetPassword(new_password);
 439         attach_openid(&CC->user, claimed_id);
 440         populate_vcard_from_sreg(sreg_keys);
 441         return(0);
 442 }
 443
 444
 445 /*
 446  * If a user account exists which is associated with the Claimed ID, log it in and return zero.
 447  * Otherwise it returns nonzero.
 448  */
 449 int login_via_openid(StrBuf *claimed_id)
 450 {
 451         struct cdbdata *cdboi;
 452         long usernum = 0;
 453
 454         cdboi = cdb_fetch(CDB_OPENID, ChrPtr(claimed_id), StrLength(claimed_id));
 455         if (cdboi == NULL) {
 456                 return(-1);
 457         }
 458
 459         memcpy(&usernum, cdboi->ptr, sizeof(long));
 460         cdb_free(cdboi);
 461
 462         if (!CtdlGetUserByNumber(&CC->user, usernum)) {
 463                 /* Now become the user we just created */
 464                 safestrncpy(CC->curr_user, CC->user.fullname, sizeof CC->curr_user);
 465                 do_login();
 466                 return(0);
 467         }
 468         else {
 469                 memset(&CC->user, 0, sizeof(struct ctdluser));
 470                 return(-1);
 471         }
 472 }
 473
 474
 475
 476
 477 /**************************************************************************/
 478 /*                                                                        */
 479 /* Functions in this section handle OpenID protocol                       */
 480 /*                                                                        */
 481 /**************************************************************************/
 482
 483
 484 /*
 485  * Locate a <link> tag and, given its 'rel=' parameter, return its 'href' parameter
 486  */
 487 void extract_link(StrBuf *target_buf, const char *rel, long repllen, StrBuf *source_buf)
 488 {
 489         int i;
 490         const char *ptr;
 491         const char *href_start = NULL;
 492         const char *href_end = NULL;
 493         const char *link_tag_start = NULL;
 494         const char *link_tag_end = NULL;
 495         const char *rel_start = NULL;
 496         const char *rel_end = NULL;
 497
 498         if (!target_buf) return;
 499         if (!rel) return;
 500         if (!source_buf) return;
 501
 502         ptr = ChrPtr(source_buf);
 503
 504         FlushStrBuf(target_buf);
 505         while (ptr = cbmstrcasestr(ptr, "<link"), ptr != NULL) {
 506
 507                 link_tag_start = ptr;
 508                 link_tag_end = strchr(ptr, '>');
 509                 if (link_tag_end == NULL)
 510                         break;
 511                 for (i=0; i < 1; i++ ){
 512                         rel_start = cbmstrcasestr(link_tag_start, "rel=");
 513                         if ((rel_start == NULL) ||
 514                             (rel_start > link_tag_end))
 515                                 continue;
 516
 517                         rel_start = strchr(rel_start, '\"');
 518                         if ((rel_start == NULL) ||
 519                             (rel_start > link_tag_end))
 520                                 continue;
 521                         ++rel_start;
 522                         rel_end = strchr(rel_start, '\"');
 523                         if ((rel_end == NULL) ||
 524                             (rel_end == rel_start) ||
 525                             (rel_end >= link_tag_end) )
 526                                 continue;
 527                         if (strncasecmp(rel, rel_start, repllen)!= 0)
 528                                 continue; /* didn't match? never mind... */
 529
 530                         href_start = cbmstrcasestr(link_tag_start, "href=");
 531                         if ((href_start == NULL) ||
 532                             (href_start >= link_tag_end))
 533                                 continue;
 534                         href_start = strchr(href_start, '\"');
 535                         if ((href_start == NULL) |
 536                             (href_start >= link_tag_end))
 537                                 continue;
 538                         ++href_start;
 539                         href_end = strchr(href_start, '\"');
 540                         if ((href_end == NULL) ||
 541                             (href_end == href_start) ||
 542                             (href_start >= link_tag_end))
 543                                 continue;
 544                         StrBufPlain(target_buf, href_start, href_end - href_start);
 545                 }
 546                 ptr = link_tag_end;
 547         }
 548 }
 549
 550
 551 /*
 552  * Wrapper for curl_easy_init() that includes the options common to all calls
 553  * used in this module.
 554  */
 555 CURL *ctdl_openid_curl_easy_init(char *errmsg) {
 556         CURL *curl;
 557
 558         curl = curl_easy_init();
 559         if (!curl) {
 560                 return(curl);
 561         }
 562
 563         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 564         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 565
 566         if (errmsg) {
 567                 curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
 568         }
 569         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 570 #ifdef CURLOPT_HTTP_CONTENT_DECODING
 571         curl_easy_setopt(curl, CURLOPT_HTTP_CONTENT_DECODING, 1);
 572         curl_easy_setopt(curl, CURLOPT_ENCODING, "");
 573 #endif
 574         curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
 575         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 30);            /* die after 30 seconds */
 576
 577         if (
 578                 (!IsEmptyStr(config.c_ip_addr))
 579                 && (strcmp(config.c_ip_addr, "*"))
 580                 && (strcmp(config.c_ip_addr, "::"))
 581                 && (strcmp(config.c_ip_addr, "0.0.0.0"))
 582         ) {
 583                 curl_easy_setopt(curl, CURLOPT_INTERFACE, config.c_ip_addr);
 584         }
 585
 586         return(curl);
 587 }
 588
 589
 590 struct xrds {
 591         StrBuf *CharData;
 592         int nesting_level;
 593         int in_xrd;
 594         int current_service_priority;
 595         int selected_service_priority;  /* FIXME more here later */
 596 };
 597
 598
 599 void xrds_xml_start(void *data, const char *supplied_el, const char **attr) {
 600         struct xrds *xrds = (struct xrds *) data;
 601         int i;
 602
 603         ++xrds->nesting_level;
 604
 605         if (!strcasecmp(supplied_el, "XRD")) {
 606                 ++xrds->in_xrd;
 607                 syslog(LOG_DEBUG, "*** XRD CONTAINER BEGIN ***");
 608         }
 609
 610         else if (!strcasecmp(supplied_el, "service")) {
 611                 xrds->current_service_priority = 0;
 612                 for (i=0; attr[i] != NULL; i+=2) {
 613                         if (!strcasecmp(attr[i], "priority")) {
 614                                 xrds->current_service_priority = atoi(attr[i+1]);
 615                         }
 616                 }
 617         }
 618
 619         FlushStrBuf(xrds->CharData);
 620 }
 621
 622
 623 void xrds_xml_end(void *data, const char *supplied_el) {
 624         struct xrds *xrds = (struct xrds *) data;
 625
 626         --xrds->nesting_level;
 627
 628         if (!strcasecmp(supplied_el, "XRD")) {
 629                 --xrds->in_xrd;
 630                 syslog(LOG_DEBUG, "*** XRD CONTAINER END ***");
 631         }
 632
 633         else if (!strcasecmp(supplied_el, "service")) {
 634                 /* this is where we should evaluate the service and do stuff */
 635                 xrds->current_service_priority = 0;
 636         }
 637
 638         FlushStrBuf(xrds->CharData);
 639 }
 640
 641
 642 void xrds_xml_chardata(void *data, const XML_Char *s, int len) {
 643         struct xrds *xrds = (struct xrds *) data;
 644
 645         StrBufAppendBufPlain (xrds->CharData, s, len, 0);
 646 }
 647
 648
 649 /*
 650  * Parse an XRDS document.
 651  * If an OpenID Provider URL is discovered, op_url to that value and return nonzero.
 652  * If nothing useful happened, return 0.
 653  */
 654 int parse_xrds_document(StrBuf *ReplyBuf) {
 655         ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
 656         struct xrds xrds;
 657         int return_value = 0;
 658
 659         syslog(LOG_DEBUG, "\033[32m --- XRDS DOCUMENT --- \n%s\033[0m", ChrPtr(ReplyBuf));
 660
 661         memset(&xrds, 0, sizeof (struct xrds));
 662         xrds.CharData = NewStrBuf();
 663         XML_Parser xp = XML_ParserCreate(NULL);
 664         if (xp) {
 665                 XML_SetUserData(xp, &xrds);
 666                 XML_SetElementHandler(xp, xrds_xml_start, xrds_xml_end);
 667                 XML_SetCharacterDataHandler(xp, xrds_xml_chardata);
 668                 XML_Parse(xp, ChrPtr(ReplyBuf), StrLength(ReplyBuf), 0);
 669                 XML_Parse(xp, "", 0, 1);
 670                 XML_ParserFree(xp);
 671         }
 672         else {
 673                 syslog(LOG_ALERT, "Cannot create XML parser");
 674         }
 675         FreeStrBuf(&xrds.CharData);
 676
 677         if (StrLength(oiddata->op_url) > 0) {
 678                 syslog(LOG_DEBUG, "\033[31mOP VIA XRDS DISCO: %s\033[0m", ChrPtr(oiddata->op_url));
 679                 return_value = 1;
 680         }
 681         return(return_value);
 682 }
 683
 684
 685
 686 /*
 687  * Callback function for perform_openid2_discovery()
 688  * We're interested in the X-XRDS-Location: header.
 689  */
 690 size_t yadis_headerfunction(void *ptr, size_t size, size_t nmemb, void *userdata) {
 691         char hdr[1024];
 692         StrBuf **x_xrds_location = (StrBuf **) userdata;
 693
 694         memcpy(hdr, ptr, (size*nmemb));
 695         hdr[size*nmemb] = 0;
 696
 697         if (!strncasecmp(hdr, "X-XRDS-Location:", 16)) {
 698                 *x_xrds_location = NewStrBufPlain(&hdr[16], ((size*nmemb)-16));
 699                 StrBufTrim(*x_xrds_location);
 700         }
 701
 702         return(size * nmemb);
 703 }
 704
 705
 706
 707 /* Attempt to perform Yadis discovery as specified in Yadis 1.0 section 6.2.5.
 708  *
 709  * If Yadis fails, we then attempt HTML discovery using the same document.
 710  *
 711  * If successful, returns nonzero and calls parse_xrds_document() to act upon the received data.
 712  * If fails, returns 0 and does nothing else.
 713  */
 714 int perform_openid2_discovery(StrBuf *YadisURL) {
 715         ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
 716         int docbytes = (-1);
 717         StrBuf *ReplyBuf = NULL;
 718         int return_value = 0;
 719         CURL *curl;
 720         CURLcode result;
 721         char errmsg[1024] = "";
 722         struct curl_slist *my_headers = NULL;
 723         StrBuf *x_xrds_location = NULL;
 724
 725         if (!YadisURL) return(0);
 726         syslog(LOG_DEBUG, "perform_openid2_discovery(%s)", ChrPtr(YadisURL));
 727         if (StrLength(YadisURL) == 0) return(0);
 728
 729         ReplyBuf = NewStrBuf();
 730         if (!ReplyBuf) return(0);
 731
 732         curl = ctdl_openid_curl_easy_init(errmsg);
 733         if (!curl) return(0);
 734
 735         curl_easy_setopt(curl, CURLOPT_URL, ChrPtr(YadisURL));
 736         curl_easy_setopt(curl, CURLOPT_WRITEDATA, ReplyBuf);
 737         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, CurlFillStrBuf_callback);
 738
 739         my_headers = curl_slist_append(my_headers, "Accept:");  /* disable the default Accept: header */
 740         my_headers = curl_slist_append(my_headers, "Accept: application/xrds+xml");
 741         curl_easy_setopt(curl, CURLOPT_HTTPHEADER, my_headers);
 742
 743         curl_easy_setopt(curl, CURLOPT_WRITEHEADER, &x_xrds_location);
 744         curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, yadis_headerfunction);
 745
 746         result = curl_easy_perform(curl);
 747         if (result) {
 748                 syslog(LOG_DEBUG, "libcurl error %d: %s", result, errmsg);
 749         }
 750         curl_slist_free_all(my_headers);
 751         curl_easy_cleanup(curl);
 752         docbytes = StrLength(ReplyBuf);
 753
 754         /*
 755          * The response from the server will be one of:
 756          *
 757          * Option 1: An HTML document with a <head> element that includes a <meta> element with http-equiv
 758          * attribute, X-XRDS-Location,
 759          */
 760         /* FIXME handle this somehow */
 761
 762         /*
 763          * Option 2: HTTP response-headers that include an X-XRDS-Location response-header,
 764          *           together with a document.
 765          * Option 3: HTTP response-headers only, which MAY include an X-XRDS-Location response-header,
 766          *           a contenttype response-header specifying MIME media type,
 767          *           application/xrds+xml, or both.
 768          *
 769          * If the X-XRDS-Location header was delivered, we know about it at this point...
 770          */
 771         if (    (x_xrds_location)
 772                 && (strcmp(ChrPtr(x_xrds_location), ChrPtr(YadisURL)))
 773         ) {
 774                 syslog(LOG_DEBUG, "X-XRDS-Location: %s ... recursing!", ChrPtr(x_xrds_location));
 775                 return_value = perform_openid2_discovery(x_xrds_location);
 776                 FreeStrBuf(&x_xrds_location);
 777         }
 778
 779         /*
 780          * Option 4: the returned web page may *be* an XRDS document.  Try to parse it.
 781          */
 782         else if (docbytes >= 0) {
 783                 return_value = parse_xrds_document(ReplyBuf);
 784         }
 785
 786         /*
 787          * Option 5: if all else fails, attempt HTML based discovery.
 788          */
 789         if (return_value == 0) {
 790                 syslog(LOG_DEBUG, "Attempting HTML discovery");
 791                 if (oiddata->op_url == NULL) {
 792                         oiddata->op_url = NewStrBuf();
 793                 }
 794                 extract_link(oiddata->op_url, HKEY("openid2.provider"), ReplyBuf);
 795                 if (StrLength(oiddata->op_url) > 0) {
 796                         syslog(LOG_DEBUG, "\033[31mOP VIA HTML DISCO: %s\033[0m", ChrPtr(oiddata->op_url));
 797                         return_value = 1;
 798                 }
 799         }
 800
 801         if (ReplyBuf != NULL) {
 802                 FreeStrBuf(&ReplyBuf);
 803         }
 804         return(return_value);
 805 }
 806
 807
 808 /*
 809  * Setup an OpenID authentication
 810  */
 811 void cmd_oids(char *argbuf) {
 812         struct CitContext *CCC = CC;    /* CachedCitContext - performance boost */
 813         const char *Pos = NULL;
 814         StrBuf *ArgBuf = NULL;
 815         StrBuf *ReplyBuf = NULL;
 816         StrBuf *return_to = NULL;
 817         StrBuf *trust_root = NULL;
 818         StrBuf *openid_delegate = NULL;
 819         StrBuf *RedirectUrl = NULL;
 820         ctdl_openid *oiddata;
 821         int discovery_succeeded = 0;
 822
 823         Free_ctdl_openid ((ctdl_openid**)&CCC->openid_data);
 824
 825         CCC->openid_data = oiddata = malloc(sizeof(ctdl_openid));
 826         if (oiddata == NULL) {
 827                 syslog(LOG_ALERT, "malloc() failed: %s", strerror(errno));
 828                 cprintf("%d malloc failed\n", ERROR + INTERNAL_ERROR);
 829                 return;
 830         }
 831         memset(oiddata, 0, sizeof(ctdl_openid));
 832         CCC->openid_data = (void *) oiddata;
 833
 834         ArgBuf = NewStrBufPlain(argbuf, -1);
 835
 836         oiddata->verified = 0;
 837         oiddata->claimed_id = NewStrBufPlain(NULL, StrLength(ArgBuf));
 838         trust_root = NewStrBufPlain(NULL, StrLength(ArgBuf));
 839         return_to = NewStrBufPlain(NULL, StrLength(ArgBuf));
 840
 841         StrBufExtract_NextToken(oiddata->claimed_id, ArgBuf, &Pos, '|');
 842         StrBufExtract_NextToken(return_to, ArgBuf, &Pos, '|');
 843         StrBufExtract_NextToken(trust_root, ArgBuf, &Pos, '|');
 844
 845         syslog(LOG_DEBUG, "User-Supplied Identifier is: %s", ChrPtr(oiddata->claimed_id));
 846
 847
 848         /********** OpenID 2.0 section 7.3 - Discovery **********/
 849
 850         /* Section 7.3.1 says we have to attempt XRI based discovery.
 851          * No one is using this, no one is asking for it, no one wants it.
 852          * So we're not even going to bother attempting this mode.
 853          */
 854
 855         /* Attempt section 7.3.2 (Yadis discovery) and section 7.3.3 (HTML discovery);
 856          */
 857         discovery_succeeded = perform_openid2_discovery(oiddata->claimed_id);
 858
 859         if (StrLength(oiddata->op_url) == 0) {
 860                 cprintf("%d There is no OpenID identity provider at this location.\n", ERROR);
 861         }
 862
 863         else {
 864                 /*
 865                  * If we get to this point we are in possession of a valid OpenID Provider URL.
 866                  */
 867
 868                 /* Empty delegate is legal; we just use the openid_url instead */
 869                 if (StrLength(openid_delegate) == 0) {
 870                         StrBufPlain(openid_delegate, SKEY(oiddata->claimed_id));
 871                 }
 872
 873                 /* Assemble a URL to which the user-agent will be redirected. */
 874
 875                 RedirectUrl = NewStrBufDup(oiddata->op_url);
 876
 877                 StrBufAppendBufPlain(RedirectUrl, HKEY("?openid.mode=checkid_setup&openid.identity="), 0);
 878                 StrBufUrlescAppend(RedirectUrl, openid_delegate, NULL);
 879
 880                 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.return_to="), 0);
 881                 StrBufUrlescAppend(RedirectUrl, return_to, NULL);
 882
 883                 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.trust_root="), 0);
 884                 StrBufUrlescAppend(RedirectUrl, trust_root, NULL);
 885
 886                 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.sreg.optional="), 0);
 887                 StrBufUrlescAppend(RedirectUrl, NULL, "nickname,email,fullname,postcode,country,dob,gender");
 888
 889                 cprintf("%d %s\n", CIT_OK, ChrPtr(RedirectUrl));
 890         }
 891
 892         FreeStrBuf(&ArgBuf);
 893         FreeStrBuf(&ReplyBuf);
 894         FreeStrBuf(&return_to);
 895         FreeStrBuf(&trust_root);
 896         FreeStrBuf(&openid_delegate);
 897         FreeStrBuf(&RedirectUrl);
 898 }
 899
 900
 901
 902
 903
 904 /*
 905  * Finalize an OpenID authentication
 906  */
 907 void cmd_oidf(char *argbuf) {
 908         long len;
 909         char buf[2048];
 910         char thiskey[1024];
 911         char thisdata[1024];
 912         HashList *keys = NULL;
 913         ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
 914
 915         if (oiddata == NULL) {
 916                 cprintf("%d run OIDS first.\n", ERROR + INTERNAL_ERROR);
 917                 return;
 918         }
 919         if (StrLength(oiddata->op_url) == 0){
 920                 cprintf("%d need a remote server to authenticate against\n", ERROR + ILLEGAL_VALUE);
 921                 return;
 922         }
 923         keys = NewHash(1, NULL);
 924         if (!keys) {
 925                 cprintf("%d NewHash() failed\n", ERROR + INTERNAL_ERROR);
 926                 return;
 927         }
 928         cprintf("%d Transmit OpenID data now\n", START_CHAT_MODE);
 929
 930         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 931                 len = extract_token(thiskey, buf, 0, '|', sizeof thiskey);
 932                 if (len < 0)
 933                         len = sizeof(thiskey) - 1;
 934                 extract_token(thisdata, buf, 1, '|', sizeof thisdata);
 935                 syslog(LOG_DEBUG, "%s: ["SIZE_T_FMT"] %s", thiskey, strlen(thisdata), thisdata);
 936                 Put(keys, thiskey, len, strdup(thisdata), NULL);
 937         }
 938
 939
 940         /* Now that we have all of the parameters, we have to validate the signature against the server */
 941         syslog(LOG_DEBUG, "About to validate the signature...");
 942
 943         CURL *curl;
 944         CURLcode res;
 945         struct curl_httppost *formpost = NULL;
 946         struct curl_httppost *lastptr = NULL;
 947         char errmsg[1024] = "";
 948         char *o_assoc_handle = NULL;
 949         char *o_sig = NULL;
 950         char *o_signed = NULL;
 951         int num_signed_values;
 952         int i;
 953         char k_keyname[128];
 954         char k_o_keyname[128];
 955         char *k_value = NULL;
 956         StrBuf *ReplyBuf;
 957
 958         curl_formadd(&formpost, &lastptr,
 959                 CURLFORM_COPYNAME,      "openid.mode",
 960                 CURLFORM_COPYCONTENTS,  "check_authentication",
 961                 CURLFORM_END);
 962         syslog(LOG_DEBUG, "%25s : %s", "openid.mode", "check_authentication");
 963
 964         if (GetHash(keys, "assoc_handle", 12, (void *) &o_assoc_handle)) {
 965                 curl_formadd(&formpost, &lastptr,
 966                         CURLFORM_COPYNAME,      "openid.assoc_handle",
 967                         CURLFORM_COPYCONTENTS,  o_assoc_handle,
 968                         CURLFORM_END);
 969                 syslog(LOG_DEBUG, "%25s : %s", "openid.assoc_handle", o_assoc_handle);
 970         }
 971
 972         if (GetHash(keys, "sig", 3, (void *) &o_sig)) {
 973                 curl_formadd(&formpost, &lastptr,
 974                         CURLFORM_COPYNAME,      "openid.sig",
 975                         CURLFORM_COPYCONTENTS,  o_sig,
 976                         CURLFORM_END);
 977                         syslog(LOG_DEBUG, "%25s : %s", "openid.sig", o_sig);
 978         }
 979
 980         if (GetHash(keys, "signed", 6, (void *) &o_signed)) {
 981                 curl_formadd(&formpost, &lastptr,
 982                         CURLFORM_COPYNAME,      "openid.signed",
 983                         CURLFORM_COPYCONTENTS,  o_signed,
 984                         CURLFORM_END);
 985                 syslog(LOG_DEBUG, "%25s : %s", "openid.signed", o_signed);
 986
 987                 num_signed_values = num_tokens(o_signed, ',');
 988                 for (i=0; i<num_signed_values; ++i) {
 989                         extract_token(k_keyname, o_signed, i, ',', sizeof k_keyname);
 990                         if (strcasecmp(k_keyname, "mode")) {    // work around phpMyID bug
 991                                 if (GetHash(keys, k_keyname, strlen(k_keyname), (void *) &k_value)) {
 992                                         snprintf(k_o_keyname, sizeof k_o_keyname, "openid.%s", k_keyname);
 993                                         curl_formadd(&formpost, &lastptr,
 994                                                 CURLFORM_COPYNAME,      k_o_keyname,
 995                                                 CURLFORM_COPYCONTENTS,  k_value,
 996                                                 CURLFORM_END);
 997                                         syslog(LOG_DEBUG, "%25s : %s", k_o_keyname, k_value);
 998                                 }
 999                                 else {
1000                                         syslog(LOG_INFO, "OpenID: signed field '%s' is missing",
1001                                                 k_keyname);
1002                                 }
1003                         }
1004                 }
1005         }
1006
1007         ReplyBuf = NewStrBuf();
1008
1009         curl = ctdl_openid_curl_easy_init(errmsg);
1010         curl_easy_setopt(curl, CURLOPT_URL, ChrPtr(oiddata->op_url));
1011         curl_easy_setopt(curl, CURLOPT_WRITEDATA, ReplyBuf);
1012         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, CurlFillStrBuf_callback);
1013         curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
1014
1015         res = curl_easy_perform(curl);
1016         if (res) {
1017                 syslog(LOG_DEBUG, "cmd_oidf() libcurl error %d: %s", res, errmsg);
1018         }
1019         curl_easy_cleanup(curl);
1020         curl_formfree(formpost);
1021
1022         if (cbmstrcasestr(ChrPtr(ReplyBuf), "is_valid:true")) {
1023                 oiddata->verified = 1;
1024         }
1025         FreeStrBuf(&ReplyBuf);
1026
1027         syslog(LOG_DEBUG, "Authentication %s.", (oiddata->verified ? "succeeded" : "failed") );
1028
1029         /* Respond to the client */
1030
1031         if (oiddata->verified) {
1032
1033                 /* If we were already logged in, attach the OpenID to the user's account */
1034                 if (CC->logged_in) {
1035                         if (attach_openid(&CC->user, oiddata->claimed_id) == 0) {
1036                                 cprintf("attach\n");
1037                                 syslog(LOG_DEBUG, "OpenID attach succeeded");
1038                         }
1039                         else {
1040                                 cprintf("fail\n");
1041                                 syslog(LOG_DEBUG, "OpenID attach failed");
1042                         }
1043                 }
1044
1045                 /* Otherwise, a user is attempting to log in using the verified OpenID */
1046                 else {
1047                         /*
1048                          * Existing user who has claimed this OpenID?
1049                          *
1050                          * Note: if you think that sending the password back over the wire is insecure,
1051                          * check your assumptions.  If someone has successfully asserted an OpenID that
1052                          * is associated with the account, they already have password equivalency and can
1053                          * login, so they could just as easily change the password, etc.
1054                          */
1055                         if (login_via_openid(oiddata->claimed_id) == 0) {
1056                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
1057                                 logged_in_response();
1058                                 syslog(LOG_DEBUG, "Logged in using previously claimed OpenID");
1059                         }
1060
1061                         /*
1062                          * If this system does not allow self-service new user registration, the
1063                          * remaining modes do not apply, so fail here and now.
1064                          */
1065                         else if (config.c_disable_newu) {
1066                                 cprintf("fail\n");
1067                                 syslog(LOG_DEBUG, "Creating user failed due to local policy");
1068                         }
1069
1070                         /*
1071                          * New user whose OpenID is verified and Simple Registration Extension is in use?
1072                          */
1073                         else if (openid_create_user_via_sreg(oiddata->claimed_id, keys) == 0) {
1074                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
1075                                 logged_in_response();
1076                                 syslog(LOG_DEBUG, "Successfully auto-created new user");
1077                         }
1078
1079                         /*
1080                          * OpenID is verified, but the desired username either was not specified or
1081                          * conflicts with an existing user.  Manual account creation is required.
1082                          */
1083                         else {
1084                                 char *desired_name = NULL;
1085                                 cprintf("verify_only\n");
1086                                 cprintf("%s\n", ChrPtr(oiddata->claimed_id));
1087                                 if (GetHash(keys, "sreg.nickname", 13, (void *) &desired_name)) {
1088                                         cprintf("%s\n", desired_name);
1089                                 }
1090                                 else {
1091                                         cprintf("\n");
1092                                 }
1093                                 syslog(LOG_DEBUG, "The desired Simple Registration name is already taken.");
1094                         }
1095                 }
1096         }
1097         else {
1098                 cprintf("fail\n");
1099         }
1100         cprintf("000\n");
1101
1102         if (oiddata->sreg_keys != NULL) {
1103                 DeleteHash(&oiddata->sreg_keys);
1104                 oiddata->sreg_keys = NULL;
1105         }
1106         oiddata->sreg_keys = keys;
1107 }
1108
1109
1110
1111 /**************************************************************************/
1112 /*                                                                        */
1113 /* Functions in this section handle module initialization and shutdown    */
1114 /*                                                                        */
1115 /**************************************************************************/
1116
1117
1118
1119
1120 CTDL_MODULE_INIT(openid_rp)
1121 {
1122         if (!threading) {
1123                 curl_global_init(CURL_GLOBAL_ALL);
1124
1125                 /* Only enable the OpenID command set when native mode authentication is in use. */
1126                 if (config.c_auth_mode == AUTHMODE_NATIVE) {
1127                         CtdlRegisterProtoHook(cmd_oids, "OIDS", "Setup OpenID authentication");
1128                         CtdlRegisterProtoHook(cmd_oidf, "OIDF", "Finalize OpenID authentication");
1129                         CtdlRegisterProtoHook(cmd_oidl, "OIDL", "List OpenIDs associated with an account");
1130                         CtdlRegisterProtoHook(cmd_oidd, "OIDD", "Detach an OpenID from an account");
1131                         CtdlRegisterProtoHook(cmd_oidc, "OIDC", "Create new user after validating OpenID");
1132                         CtdlRegisterProtoHook(cmd_oida, "OIDA", "List all OpenIDs in the database");
1133                 }
1134                 CtdlRegisterSessionHook(openid_cleanup_function, EVT_LOGOUT);
1135                 CtdlRegisterUserHook(openid_purge, EVT_PURGEUSER);
1136                 openid_level_supported = 1;     /* This module supports OpenID 1.0 only */
1137         }
1138
1139         /* return our module name for the log */
1140         return "openid_rp";
1141 }