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 enum {
  63         openid_disco_none,
  64         openid_disco_xrds,
  65         openid_disco_html
  66 };
  67
  68
  69
  70 void Free_ctdl_openid(ctdl_openid **FreeMe)
  71 {
  72         if (*FreeMe == NULL) {
  73                 return;
  74         }
  75         FreeStrBuf(&(*FreeMe)->op_url);
  76         FreeStrBuf(&(*FreeMe)->claimed_id);
  77         DeleteHash(&(*FreeMe)->sreg_keys);
  78         free(*FreeMe);
  79         *FreeMe = NULL;
  80 }
  81
  82
  83 /*
  84  * This cleanup function blows away the temporary memory used by this module.
  85  */
  86 void openid_cleanup_function(void) {
  87         struct CitContext *CCC = CC;    /* CachedCitContext - performance boost */
  88
  89         if (CCC->openid_data != NULL) {
  90                 syslog(LOG_DEBUG, "Clearing OpenID session state");
  91                 Free_ctdl_openid((ctdl_openid **) &CCC->openid_data);
  92         }
  93 }
  94
  95
  96 /**************************************************************************/
  97 /*                                                                        */
  98 /* Functions in this section handle Citadel internal OpenID mapping stuff */
  99 /*                                                                        */
 100 /**************************************************************************/
 101
 102
 103 /*
 104  * The structure of an openid record *key* is:
 105  *
 106  * |--------------claimed_id-------------|
 107  *     (actual length of claimed id)
 108  *
 109  *
 110  * The structure of an openid record *value* is:
 111  *
 112  * |-----user_number----|------------claimed_id---------------|
 113  *    (sizeof long)          (actual length of claimed id)
 114  *
 115  */
 116
 117
 118
 119 /*
 120  * Attach an OpenID to a Citadel account
 121  */
 122 int attach_openid(struct ctdluser *who, StrBuf *claimed_id)
 123 {
 124         struct cdbdata *cdboi;
 125         long fetched_usernum;
 126         char *data;
 127         int data_len;
 128         char buf[2048];
 129
 130         if (!who) return(1);
 131         if (StrLength(claimed_id)==0) return(1);
 132
 133         /* Check to see if this OpenID is already in the database */
 134
 135         cdboi = cdb_fetch(CDB_OPENID, ChrPtr(claimed_id), StrLength(claimed_id));
 136         if (cdboi != NULL) {
 137                 memcpy(&fetched_usernum, cdboi->ptr, sizeof(long));
 138                 cdb_free(cdboi);
 139
 140                 if (fetched_usernum == who->usernum) {
 141                         syslog(LOG_INFO, "%s already associated; no action is taken", ChrPtr(claimed_id));
 142                         return(0);
 143                 }
 144                 else {
 145                         syslog(LOG_INFO, "%s already belongs to another user", ChrPtr(claimed_id));
 146                         return(3);
 147                 }
 148         }
 149
 150         /* Not already in the database, so attach it now */
 151
 152         data_len = sizeof(long) + StrLength(claimed_id) + 1;
 153         data = malloc(data_len);
 154
 155         memcpy(data, &who->usernum, sizeof(long));
 156         memcpy(&data[sizeof(long)], ChrPtr(claimed_id), StrLength(claimed_id) + 1);
 157
 158         cdb_store(CDB_OPENID, ChrPtr(claimed_id), StrLength(claimed_id), data, data_len);
 159         free(data);
 160
 161         snprintf(buf, sizeof buf, "User <%s> (#%ld) has claimed the OpenID URL %s\n",
 162                  who->fullname, who->usernum, ChrPtr(claimed_id));
 163         CtdlAideMessage(buf, "OpenID claim");
 164         syslog(LOG_INFO, "%s", buf);
 165         return(0);
 166 }
 167
 168
 169
 170 /*
 171  * When a user is being deleted, we have to delete any OpenID associations
 172  */
 173 void openid_purge(struct ctdluser *usbuf) {
 174         struct cdbdata *cdboi;
 175         HashList *keys = NULL;
 176         HashPos *HashPos;
 177         char *deleteme = NULL;
 178         long len;
 179         void *Value;
 180         const char *Key;
 181         long usernum = 0L;
 182
 183         keys = NewHash(1, NULL);
 184         if (!keys) return;
 185
 186         cdb_rewind(CDB_OPENID);
 187         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 188                 if (cdboi->len > sizeof(long)) {
 189                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 190                         if (usernum == usbuf->usernum) {
 191                                 deleteme = strdup(cdboi->ptr + sizeof(long)),
 192                                 Put(keys, deleteme, strlen(deleteme), deleteme, NULL);
 193                         }
 194                 }
 195                 cdb_free(cdboi);
 196         }
 197
 198         /* Go through the hash list, deleting keys we stored in it */
 199
 200         HashPos = GetNewHashPos(keys, 0);
 201         while (GetNextHashPos(keys, HashPos, &len, &Key, &Value)!=0)
 202         {
 203                 syslog(LOG_DEBUG, "Deleting associated OpenID <%s>", (char*)Value);
 204                 cdb_delete(CDB_OPENID, Value, strlen(Value));
 205                 /* note: don't free(Value) -- deleting the hash list will handle this for us */
 206         }
 207         DeleteHashPos(&HashPos);
 208         DeleteHash(&keys);
 209 }
 210
 211
 212 /*
 213  * List the OpenIDs associated with the currently logged in account
 214  */
 215 void cmd_oidl(char *argbuf) {
 216         struct cdbdata *cdboi;
 217         long usernum = 0L;
 218
 219         if (CtdlAccessCheck(ac_logged_in)) return;
 220         cdb_rewind(CDB_OPENID);
 221         cprintf("%d Associated OpenIDs:\n", LISTING_FOLLOWS);
 222
 223         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 224                 if (cdboi->len > sizeof(long)) {
 225                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 226                         if (usernum == CC->user.usernum) {
 227                                 cprintf("%s\n", cdboi->ptr + sizeof(long));
 228                         }
 229                 }
 230                 cdb_free(cdboi);
 231         }
 232         cprintf("000\n");
 233 }
 234
 235
 236 /*
 237  * List ALL OpenIDs in the database
 238  */
 239 void cmd_oida(char *argbuf) {
 240         struct cdbdata *cdboi;
 241         long usernum;
 242         struct ctdluser usbuf;
 243
 244         if (CtdlAccessCheck(ac_aide)) return;
 245         cdb_rewind(CDB_OPENID);
 246         cprintf("%d List of all OpenIDs in the database:\n", LISTING_FOLLOWS);
 247
 248         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 249                 if (cdboi->len > sizeof(long)) {
 250                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 251                         if (CtdlGetUserByNumber(&usbuf, usernum) != 0) {
 252                                 usbuf.fullname[0] = 0;
 253                         }
 254                         cprintf("%s|%ld|%s\n",
 255                                 cdboi->ptr + sizeof(long),
 256                                 usernum,
 257                                 usbuf.fullname
 258                         );
 259                 }
 260                 cdb_free(cdboi);
 261         }
 262         cprintf("000\n");
 263 }
 264
 265
 266 /*
 267  * Attempt to register (populate the vCard) the currently-logged-in user
 268  * using the data from Simple Registration Extension, if present.
 269  */
 270 void populate_vcard_from_sreg(HashList *sreg_keys) {
 271
 272         struct vCard *v;
 273         int pop = 0;                    /* number of fields populated */
 274         char *data = NULL;
 275         char *postcode = NULL;
 276         char *country = NULL;
 277
 278         if (!sreg_keys) return;
 279         v = vcard_new();
 280         if (!v) return;
 281
 282         if (GetHash(sreg_keys, "identity", 8, (void *) &data)) {
 283                 vcard_add_prop(v, "url;type=openid", data);
 284                 ++pop;
 285         }
 286
 287         if (GetHash(sreg_keys, "sreg.email", 10, (void *) &data)) {
 288                 vcard_add_prop(v, "email;internet", data);
 289                 ++pop;
 290         }
 291
 292         if (GetHash(sreg_keys, "sreg.nickname", 13, (void *) &data)) {
 293                 vcard_add_prop(v, "nickname", data);
 294                 ++pop;
 295         }
 296
 297         if (GetHash(sreg_keys, "sreg.fullname", 13, (void *) &data)) {
 298                 char n[256];
 299                 vcard_add_prop(v, "fn", data);
 300                 vcard_fn_to_n(n, data, sizeof n);
 301                 vcard_add_prop(v, "n", n);
 302                 ++pop;
 303         }
 304
 305         if (!GetHash(sreg_keys, "sreg.postcode", 13, (void *) &postcode)) {
 306                 postcode = NULL;
 307         }
 308
 309         if (!GetHash(sreg_keys, "sreg.country", 12, (void *) &country)) {
 310                 country = NULL;
 311         }
 312
 313         if (postcode || country) {
 314                 char adr[256];
 315                 snprintf(adr, sizeof adr, ";;;;;%s;%s",
 316                         (postcode ? postcode : ""),
 317                         (country ? country : "")
 318                 );
 319                 vcard_add_prop(v, "adr", adr);
 320                 ++pop;
 321         }
 322
 323         if (GetHash(sreg_keys, "sreg.dob", 8, (void *) &data)) {
 324                 vcard_add_prop(v, "bday", data);
 325                 ++pop;
 326         }
 327
 328         if (GetHash(sreg_keys, "sreg.gender", 11, (void *) &data)) {
 329                 vcard_add_prop(v, "x-funambol-gender", data);
 330                 ++pop;
 331         }
 332
 333         /* Only save the vCard if there is some useful data in it */
 334         if (pop > 0) {
 335                 char *ser;
 336                 ser = vcard_serialize(v);
 337                 if (ser) {
 338                         CtdlWriteObject(USERCONFIGROOM, "text/x-vcard",
 339                                 ser, strlen(ser)+1, &CC->user, 0, 0, 0
 340                         );
 341                         free(ser);
 342                 }
 343         }
 344         vcard_free(v);
 345 }
 346
 347
 348 /*
 349  * Create a new user account, manually specifying the name, after successfully
 350  * verifying an OpenID (which will of course be attached to the account)
 351  */
 352 void cmd_oidc(char *argbuf) {
 353         ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
 354
 355         if (!oiddata) {
 356                 cprintf("%d You have not verified an OpenID yet.\n", ERROR);
 357                 return;
 358         }
 359
 360         if (!oiddata->verified) {
 361                 cprintf("%d You have not verified an OpenID yet.\n", ERROR);
 362                 return;
 363         }
 364
 365         /* We can make the semantics of OIDC exactly the same as NEWU, simply
 366          * by _calling_ cmd_newu() and letting it run.  Very clever!
 367          */
 368         cmd_newu(argbuf);
 369
 370         /* Now, if this logged us in, we have to attach the OpenID */
 371         if (CC->logged_in) {
 372                 attach_openid(&CC->user, oiddata->claimed_id);
 373                 if (oiddata->sreg_keys != NULL) {
 374                         populate_vcard_from_sreg(oiddata->sreg_keys);
 375                 }
 376         }
 377
 378 }
 379
 380
 381 /*
 382  * Detach an OpenID from the currently logged in account
 383  */
 384 void cmd_oidd(char *argbuf) {
 385         struct cdbdata *cdboi;
 386         char id_to_detach[1024];
 387         int this_is_mine = 0;
 388         long usernum = 0L;
 389
 390         if (CtdlAccessCheck(ac_logged_in)) return;
 391         extract_token(id_to_detach, argbuf, 0, '|', sizeof id_to_detach);
 392         if (IsEmptyStr(id_to_detach)) {
 393                 cprintf("%d An empty OpenID URL is not allowed.\n", ERROR + ILLEGAL_VALUE);
 394         }
 395
 396         cdb_rewind(CDB_OPENID);
 397         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 398                 if (cdboi->len > sizeof(long)) {
 399                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 400                         if (usernum == CC->user.usernum) {
 401                                 this_is_mine = 1;
 402                         }
 403                 }
 404                 cdb_free(cdboi);
 405         }
 406
 407         if (!this_is_mine) {
 408                 cprintf("%d That OpenID was not found or not associated with your account.\n",
 409                         ERROR + ILLEGAL_VALUE);
 410                 return;
 411         }
 412
 413         cdb_delete(CDB_OPENID, id_to_detach, strlen(id_to_detach));
 414         cprintf("%d %s detached from your account.\n", CIT_OK, id_to_detach);
 415 }
 416
 417
 418
 419 /*
 420  * Attempt to auto-create a new Citadel account using the nickname from Simple Registration Extension
 421  */
 422 int openid_create_user_via_sreg(StrBuf *claimed_id, HashList *sreg_keys)
 423 {
 424         char *desired_name = NULL;
 425         char new_password[32];
 426         long len;
 427
 428         if (config.c_auth_mode != AUTHMODE_NATIVE) return(1);
 429         if (config.c_disable_newu) return(2);
 430         if (CC->logged_in) return(3);
 431         if (!GetHash(sreg_keys, "sreg.nickname", 13, (void *) &desired_name)) return(4);
 432
 433         syslog(LOG_DEBUG, "The desired account name is <%s>", desired_name);
 434
 435         len = cutuserkey(desired_name);
 436         if (!CtdlGetUser(&CC->user, desired_name)) {
 437                 syslog(LOG_DEBUG, "<%s> is already taken by another user.", desired_name);
 438                 memset(&CC->user, 0, sizeof(struct ctdluser));
 439                 return(5);
 440         }
 441
 442         /* The desired account name is available.  Create the account and log it in! */
 443         if (create_user(desired_name, len, 1)) return(6);
 444
 445         snprintf(new_password, sizeof new_password, "%08lx%08lx", random(), random());
 446         CtdlSetPassword(new_password);
 447         attach_openid(&CC->user, claimed_id);
 448         populate_vcard_from_sreg(sreg_keys);
 449         return(0);
 450 }
 451
 452
 453 /*
 454  * If a user account exists which is associated with the Claimed ID, log it in and return zero.
 455  * Otherwise it returns nonzero.
 456  */
 457 int login_via_openid(StrBuf *claimed_id)
 458 {
 459         struct cdbdata *cdboi;
 460         long usernum = 0;
 461
 462         cdboi = cdb_fetch(CDB_OPENID, ChrPtr(claimed_id), StrLength(claimed_id));
 463         if (cdboi == NULL) {
 464                 return(-1);
 465         }
 466
 467         memcpy(&usernum, cdboi->ptr, sizeof(long));
 468         cdb_free(cdboi);
 469
 470         if (!CtdlGetUserByNumber(&CC->user, usernum)) {
 471                 /* Now become the user we just created */
 472                 safestrncpy(CC->curr_user, CC->user.fullname, sizeof CC->curr_user);
 473                 do_login();
 474                 return(0);
 475         }
 476         else {
 477                 memset(&CC->user, 0, sizeof(struct ctdluser));
 478                 return(-1);
 479         }
 480 }
 481
 482
 483
 484
 485 /**************************************************************************/
 486 /*                                                                        */
 487 /* Functions in this section handle OpenID protocol                       */
 488 /*                                                                        */
 489 /**************************************************************************/
 490
 491
 492 /*
 493  * Locate a <link> tag and, given its 'rel=' parameter, return its 'href' parameter
 494  */
 495 void extract_link(StrBuf *target_buf, const char *rel, long repllen, StrBuf *source_buf)
 496 {
 497         int i;
 498         const char *ptr;
 499         const char *href_start = NULL;
 500         const char *href_end = NULL;
 501         const char *link_tag_start = NULL;
 502         const char *link_tag_end = NULL;
 503         const char *rel_start = NULL;
 504         const char *rel_end = NULL;
 505
 506         if (!target_buf) return;
 507         if (!rel) return;
 508         if (!source_buf) return;
 509
 510         ptr = ChrPtr(source_buf);
 511
 512         FlushStrBuf(target_buf);
 513         while (ptr = cbmstrcasestr(ptr, "<link"), ptr != NULL) {
 514
 515                 link_tag_start = ptr;
 516                 link_tag_end = strchr(ptr, '>');
 517                 if (link_tag_end == NULL)
 518                         break;
 519                 for (i=0; i < 1; i++ ){
 520                         rel_start = cbmstrcasestr(link_tag_start, "rel=");
 521                         if ((rel_start == NULL) ||
 522                             (rel_start > link_tag_end))
 523                                 continue;
 524
 525                         rel_start = strchr(rel_start, '\"');
 526                         if ((rel_start == NULL) ||
 527                             (rel_start > link_tag_end))
 528                                 continue;
 529                         ++rel_start;
 530                         rel_end = strchr(rel_start, '\"');
 531                         if ((rel_end == NULL) ||
 532                             (rel_end == rel_start) ||
 533                             (rel_end >= link_tag_end) )
 534                                 continue;
 535                         if (strncasecmp(rel, rel_start, repllen)!= 0)
 536                                 continue; /* didn't match? never mind... */
 537
 538                         href_start = cbmstrcasestr(link_tag_start, "href=");
 539                         if ((href_start == NULL) ||
 540                             (href_start >= link_tag_end))
 541                                 continue;
 542                         href_start = strchr(href_start, '\"');
 543                         if ((href_start == NULL) |
 544                             (href_start >= link_tag_end))
 545                                 continue;
 546                         ++href_start;
 547                         href_end = strchr(href_start, '\"');
 548                         if ((href_end == NULL) ||
 549                             (href_end == href_start) ||
 550                             (href_start >= link_tag_end))
 551                                 continue;
 552                         StrBufPlain(target_buf, href_start, href_end - href_start);
 553                 }
 554                 ptr = link_tag_end;
 555         }
 556 }
 557
 558
 559 /*
 560  * Wrapper for curl_easy_init() that includes the options common to all calls
 561  * used in this module.
 562  */
 563 CURL *ctdl_openid_curl_easy_init(char *errmsg) {
 564         CURL *curl;
 565
 566         curl = curl_easy_init();
 567         if (!curl) {
 568                 return(curl);
 569         }
 570
 571         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 572         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 573
 574         if (errmsg) {
 575                 curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
 576         }
 577         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 578 #ifdef CURLOPT_HTTP_CONTENT_DECODING
 579         curl_easy_setopt(curl, CURLOPT_HTTP_CONTENT_DECODING, 1);
 580         curl_easy_setopt(curl, CURLOPT_ENCODING, "");
 581 #endif
 582         curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
 583         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 30);            /* die after 30 seconds */
 584
 585         if (
 586                 (!IsEmptyStr(config.c_ip_addr))
 587                 && (strcmp(config.c_ip_addr, "*"))
 588                 && (strcmp(config.c_ip_addr, "::"))
 589                 && (strcmp(config.c_ip_addr, "0.0.0.0"))
 590         ) {
 591                 curl_easy_setopt(curl, CURLOPT_INTERFACE, config.c_ip_addr);
 592         }
 593
 594         return(curl);
 595 }
 596
 597
 598 struct xrds {
 599         StrBuf *CharData;
 600         int nesting_level;
 601         int in_xrd;
 602         int current_service_priority;
 603         int selected_service_priority;
 604         StrBuf *current_service_uri;
 605         StrBuf *selected_service_uri;
 606         int current_service_is_oid2auth;
 607 };
 608
 609
 610 void xrds_xml_start(void *data, const char *supplied_el, const char **attr) {
 611         struct xrds *xrds = (struct xrds *) data;
 612         int i;
 613
 614         ++xrds->nesting_level;
 615
 616         if (!strcasecmp(supplied_el, "XRD")) {
 617                 ++xrds->in_xrd;
 618         }
 619
 620         else if (!strcasecmp(supplied_el, "service")) {
 621                 xrds->current_service_priority = 0;
 622                 xrds->current_service_is_oid2auth = 0;
 623                 for (i=0; attr[i] != NULL; i+=2) {
 624                         if (!strcasecmp(attr[i], "priority")) {
 625                                 xrds->current_service_priority = atoi(attr[i+1]);
 626                         }
 627                 }
 628         }
 629
 630         FlushStrBuf(xrds->CharData);
 631 }
 632
 633
 634 void xrds_xml_end(void *data, const char *supplied_el) {
 635         struct xrds *xrds = (struct xrds *) data;
 636
 637         --xrds->nesting_level;
 638
 639         if (!strcasecmp(supplied_el, "XRD")) {
 640                 --xrds->in_xrd;
 641         }
 642
 643         else if (!strcasecmp(supplied_el, "type")) {
 644                 if (    (xrds->in_xrd)
 645                         && (!strcasecmp(ChrPtr(xrds->CharData), "http://specs.openid.net/auth/2.0/server"))
 646                 ) {
 647                         xrds->current_service_is_oid2auth = 1;
 648                 }
 649         }
 650
 651         else if (!strcasecmp(supplied_el, "uri")) {
 652                 if (xrds->in_xrd) {
 653                         FlushStrBuf(xrds->current_service_uri);
 654                         StrBufAppendBuf(xrds->current_service_uri, xrds->CharData, 0);
 655                 }
 656         }
 657
 658         else if (!strcasecmp(supplied_el, "service")) {
 659                 if (    (xrds->in_xrd)
 660                         && (xrds->current_service_priority < xrds->selected_service_priority)
 661                         && (xrds->current_service_is_oid2auth)
 662                 ) {
 663                         xrds->selected_service_priority = xrds->current_service_priority;
 664                         FlushStrBuf(xrds->selected_service_uri);
 665                         StrBufAppendBuf(xrds->selected_service_uri, xrds->current_service_uri, 0);
 666                 }
 667
 668         }
 669
 670         FlushStrBuf(xrds->CharData);
 671 }
 672
 673
 674 void xrds_xml_chardata(void *data, const XML_Char *s, int len) {
 675         struct xrds *xrds = (struct xrds *) data;
 676
 677         StrBufAppendBufPlain (xrds->CharData, s, len, 0);
 678 }
 679
 680
 681 /*
 682  * Parse an XRDS document.
 683  * If an OpenID Provider URL is discovered, op_url to that value and return nonzero.
 684  * If nothing useful happened, return 0.
 685  */
 686 int parse_xrds_document(StrBuf *ReplyBuf) {
 687         ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
 688         struct xrds xrds;
 689         int return_value = 0;
 690
 691         //      syslog(LOG_DEBUG, "\033[32m --- XRDS DOCUMENT --- \n%s\033[0m", ChrPtr(ReplyBuf));
 692
 693         memset(&xrds, 0, sizeof (struct xrds));
 694         xrds.selected_service_priority = INT_MAX;
 695         xrds.CharData = NewStrBuf();
 696         xrds.current_service_uri = NewStrBuf();
 697         xrds.selected_service_uri = NewStrBuf();
 698         XML_Parser xp = XML_ParserCreate(NULL);
 699         if (xp) {
 700                 XML_SetUserData(xp, &xrds);
 701                 XML_SetElementHandler(xp, xrds_xml_start, xrds_xml_end);
 702                 XML_SetCharacterDataHandler(xp, xrds_xml_chardata);
 703                 XML_Parse(xp, ChrPtr(ReplyBuf), StrLength(ReplyBuf), 0);
 704                 XML_Parse(xp, "", 0, 1);
 705                 XML_ParserFree(xp);
 706         }
 707         else {
 708                 syslog(LOG_ALERT, "Cannot create XML parser");
 709         }
 710
 711         if (xrds.selected_service_priority < INT_MAX) {
 712                 if (oiddata->op_url == NULL) {
 713                         oiddata->op_url = NewStrBuf();
 714                 }
 715                 FlushStrBuf(oiddata->op_url);
 716                 StrBufAppendBuf(oiddata->op_url, xrds.selected_service_uri, 0);
 717                 return_value = openid_disco_xrds;
 718         }
 719
 720         FreeStrBuf(&xrds.CharData);
 721         FreeStrBuf(&xrds.current_service_uri);
 722         FreeStrBuf(&xrds.selected_service_uri);
 723
 724         return(return_value);
 725 }
 726
 727
 728
 729 /*
 730  * Callback function for perform_openid2_discovery()
 731  * We're interested in the X-XRDS-Location: header.
 732  */
 733 size_t yadis_headerfunction(void *ptr, size_t size, size_t nmemb, void *userdata) {
 734         char hdr[1024];
 735         StrBuf **x_xrds_location = (StrBuf **) userdata;
 736
 737         memcpy(hdr, ptr, (size*nmemb));
 738         hdr[size*nmemb] = 0;
 739
 740         if (!strncasecmp(hdr, "X-XRDS-Location:", 16)) {
 741                 *x_xrds_location = NewStrBufPlain(&hdr[16], ((size*nmemb)-16));
 742                 StrBufTrim(*x_xrds_location);
 743         }
 744
 745         return(size * nmemb);
 746 }
 747
 748
 749 /* Attempt to perform Yadis discovery as specified in Yadis 1.0 section 6.2.5.
 750  *
 751  * If Yadis fails, we then attempt HTML discovery using the same document.
 752  *
 753  * If successful, returns nonzero and calls parse_xrds_document() to act upon the received data.
 754  * If fails, returns 0 and does nothing else.
 755  */
 756 int perform_openid2_discovery(StrBuf *YadisURL) {
 757         ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
 758         int docbytes = (-1);
 759         StrBuf *ReplyBuf = NULL;
 760         int return_value = 0;
 761         CURL *curl;
 762         CURLcode result;
 763         char errmsg[1024] = "";
 764         struct curl_slist *my_headers = NULL;
 765         StrBuf *x_xrds_location = NULL;
 766
 767         if (!YadisURL) return(0);
 768         syslog(LOG_DEBUG, "perform_openid2_discovery(%s)", ChrPtr(YadisURL));
 769         if (StrLength(YadisURL) == 0) return(0);
 770
 771         ReplyBuf = NewStrBuf();
 772         if (!ReplyBuf) return(0);
 773
 774         curl = ctdl_openid_curl_easy_init(errmsg);
 775         if (!curl) return(0);
 776
 777         curl_easy_setopt(curl, CURLOPT_URL, ChrPtr(YadisURL));
 778         curl_easy_setopt(curl, CURLOPT_WRITEDATA, ReplyBuf);
 779         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, CurlFillStrBuf_callback);
 780
 781         my_headers = curl_slist_append(my_headers, "Accept:");  /* disable the default Accept: header */
 782         my_headers = curl_slist_append(my_headers, "Accept: application/xrds+xml");
 783         curl_easy_setopt(curl, CURLOPT_HTTPHEADER, my_headers);
 784
 785         curl_easy_setopt(curl, CURLOPT_WRITEHEADER, &x_xrds_location);
 786         curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, yadis_headerfunction);
 787
 788         result = curl_easy_perform(curl);
 789         if (result) {
 790                 syslog(LOG_DEBUG, "libcurl error %d: %s", result, errmsg);
 791         }
 792         curl_slist_free_all(my_headers);
 793         curl_easy_cleanup(curl);
 794         docbytes = StrLength(ReplyBuf);
 795
 796         /*
 797          * The response from the server will be one of:
 798          *
 799          * Option 1: An HTML document with a <head> element that includes a <meta> element with http-equiv
 800          * attribute, X-XRDS-Location,
 801          */
 802         /* FIXME handle this somehow */
 803
 804         /*
 805          * Option 2: HTTP response-headers that include an X-XRDS-Location response-header,
 806          *           together with a document.
 807          * Option 3: HTTP response-headers only, which MAY include an X-XRDS-Location response-header,
 808          *           a contenttype response-header specifying MIME media type,
 809          *           application/xrds+xml, or both.
 810          *
 811          * If the X-XRDS-Location header was delivered, we know about it at this point...
 812          */
 813         if (    (x_xrds_location)
 814                 && (strcmp(ChrPtr(x_xrds_location), ChrPtr(YadisURL)))
 815         ) {
 816                 syslog(LOG_DEBUG, "X-XRDS-Location: %s ... recursing!", ChrPtr(x_xrds_location));
 817                 return_value = perform_openid2_discovery(x_xrds_location);
 818                 FreeStrBuf(&x_xrds_location);
 819         }
 820
 821         /*
 822          * Option 4: the returned web page may *be* an XRDS document.  Try to parse it.
 823          */
 824         else if (docbytes >= 0) {
 825                 return_value = parse_xrds_document(ReplyBuf);
 826         }
 827
 828         /*
 829          * Option 5: if all else fails, attempt HTML based discovery.
 830          */
 831         if (return_value == 0) {
 832                 syslog(LOG_DEBUG, "Attempting HTML discovery");
 833                 if (oiddata->op_url == NULL) {
 834                         oiddata->op_url = NewStrBuf();
 835                 }
 836                 extract_link(oiddata->op_url, HKEY("openid2.provider"), ReplyBuf);
 837                 if (StrLength(oiddata->op_url) > 0) {
 838                         return_value = openid_disco_html;
 839                 }
 840         }
 841
 842         if (ReplyBuf != NULL) {
 843                 FreeStrBuf(&ReplyBuf);
 844         }
 845         return(return_value);
 846 }
 847
 848
 849 /*
 850  * Setup an OpenID authentication
 851  */
 852 void cmd_oids(char *argbuf) {
 853         struct CitContext *CCC = CC;    /* CachedCitContext - performance boost */
 854         const char *Pos = NULL;
 855         StrBuf *ArgBuf = NULL;
 856         StrBuf *ReplyBuf = NULL;
 857         StrBuf *return_to = NULL;
 858         StrBuf *RedirectUrl = NULL;
 859         ctdl_openid *oiddata;
 860         int discovery_succeeded = 0;
 861
 862         Free_ctdl_openid ((ctdl_openid**)&CCC->openid_data);
 863
 864         CCC->openid_data = oiddata = malloc(sizeof(ctdl_openid));
 865         if (oiddata == NULL) {
 866                 syslog(LOG_ALERT, "malloc() failed: %s", strerror(errno));
 867                 cprintf("%d malloc failed\n", ERROR + INTERNAL_ERROR);
 868                 return;
 869         }
 870         memset(oiddata, 0, sizeof(ctdl_openid));
 871         CCC->openid_data = (void *) oiddata;
 872
 873         ArgBuf = NewStrBufPlain(argbuf, -1);
 874
 875         oiddata->verified = 0;
 876         oiddata->claimed_id = NewStrBufPlain(NULL, StrLength(ArgBuf));
 877         return_to = NewStrBufPlain(NULL, StrLength(ArgBuf));
 878
 879         StrBufExtract_NextToken(oiddata->claimed_id, ArgBuf, &Pos, '|');
 880         StrBufExtract_NextToken(return_to, ArgBuf, &Pos, '|');
 881
 882         syslog(LOG_DEBUG, "User-Supplied Identifier is: %s", ChrPtr(oiddata->claimed_id));
 883
 884
 885         /********** OpenID 2.0 section 7.3 - Discovery **********/
 886
 887         /* Section 7.3.1 says we have to attempt XRI based discovery.
 888          * No one is using this, no one is asking for it, no one wants it.
 889          * So we're not even going to bother attempting this mode.
 890          */
 891
 892         /* Attempt section 7.3.2 (Yadis discovery) and section 7.3.3 (HTML discovery);
 893          */
 894         discovery_succeeded = perform_openid2_discovery(oiddata->claimed_id);
 895
 896         if (discovery_succeeded == 0) {
 897                 cprintf("%d There is no OpenID identity provider at this location.\n", ERROR);
 898         }
 899
 900         else {
 901                 /*
 902                  * If we get to this point we are in possession of a valid OpenID Provider URL.
 903                  */
 904                 syslog(LOG_DEBUG, "OP URI '%s' discovered using method %d",
 905                         ChrPtr(oiddata->op_url),
 906                         discovery_succeeded
 907                 );
 908
 909                 /* Assemble a URL to which the user-agent will be redirected. */
 910
 911                 RedirectUrl = NewStrBufDup(oiddata->op_url);
 912
 913                 StrBufAppendBufPlain(RedirectUrl, HKEY("?openid.ns=http:%2F%2Fspecs.openid.net%2Fauth%2F2.0"), 0);
 914
 915                 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.mode=checkid_setup"), 0);
 916
 917                 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.claimed_id="), 0);
 918                 StrBufUrlescAppend(RedirectUrl, oiddata->claimed_id, NULL);
 919
 920                 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.identity="), 0);
 921                 StrBufUrlescAppend(RedirectUrl, oiddata->claimed_id, NULL);
 922
 923                 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.return_to="), 0);
 924                 StrBufUrlescAppend(RedirectUrl, return_to, NULL);
 925
 926 /*
 927                 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.sreg.optional="), 0);
 928                 StrBufUrlescAppend(RedirectUrl, NULL, "nickname,email,fullname,postcode,country,dob,gender");
 929 */
 930
 931                 syslog(LOG_DEBUG, "\033[36m%s\033[0m", ChrPtr(RedirectUrl));
 932                 cprintf("%d %s\n", CIT_OK, ChrPtr(RedirectUrl));
 933         }
 934
 935         FreeStrBuf(&ArgBuf);
 936         FreeStrBuf(&ReplyBuf);
 937         FreeStrBuf(&return_to);
 938         FreeStrBuf(&RedirectUrl);
 939 }
 940
 941
 942
 943
 944
 945 /*
 946  * Finalize an OpenID authentication
 947  */
 948 void cmd_oidf(char *argbuf) {
 949         long len;
 950         char buf[2048];
 951         char thiskey[1024];
 952         char thisdata[1024];
 953         HashList *keys = NULL;
 954         ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
 955
 956         if (oiddata == NULL) {
 957                 cprintf("%d run OIDS first.\n", ERROR + INTERNAL_ERROR);
 958                 return;
 959         }
 960         if (StrLength(oiddata->op_url) == 0){
 961                 cprintf("%d need a remote server to authenticate against\n", ERROR + ILLEGAL_VALUE);
 962                 return;
 963         }
 964         keys = NewHash(1, NULL);
 965         if (!keys) {
 966                 cprintf("%d NewHash() failed\n", ERROR + INTERNAL_ERROR);
 967                 return;
 968         }
 969         cprintf("%d Transmit OpenID data now\n", START_CHAT_MODE);
 970
 971         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 972                 len = extract_token(thiskey, buf, 0, '|', sizeof thiskey);
 973                 if (len < 0)
 974                         len = sizeof(thiskey) - 1;
 975                 extract_token(thisdata, buf, 1, '|', sizeof thisdata);
 976                 syslog(LOG_DEBUG, "%s: ["SIZE_T_FMT"] %s", thiskey, strlen(thisdata), thisdata);
 977                 Put(keys, thiskey, len, strdup(thisdata), NULL);
 978         }
 979
 980
 981         /* Now that we have all of the parameters, we have to validate the signature against the server */
 982         syslog(LOG_DEBUG, "About to validate the signature...");
 983
 984         CURL *curl;
 985         CURLcode res;
 986         struct curl_httppost *formpost = NULL;
 987         struct curl_httppost *lastptr = NULL;
 988         char errmsg[1024] = "";
 989         char *o_assoc_handle = NULL;
 990         char *o_sig = NULL;
 991         char *o_signed = NULL;
 992         int num_signed_values;
 993         int i;
 994         char k_keyname[128];
 995         char k_o_keyname[128];
 996         char *k_value = NULL;
 997         StrBuf *ReplyBuf;
 998
 999         curl_formadd(&formpost, &lastptr,
1000                 CURLFORM_COPYNAME,      "openid.mode",
1001                 CURLFORM_COPYCONTENTS,  "check_authentication",
1002                 CURLFORM_END);
1003         syslog(LOG_DEBUG, "%25s : %s", "openid.mode", "check_authentication");
1004
1005         if (GetHash(keys, "assoc_handle", 12, (void *) &o_assoc_handle)) {
1006                 curl_formadd(&formpost, &lastptr,
1007                         CURLFORM_COPYNAME,      "openid.assoc_handle",
1008                         CURLFORM_COPYCONTENTS,  o_assoc_handle,
1009                         CURLFORM_END);
1010                 syslog(LOG_DEBUG, "%25s : %s", "openid.assoc_handle", o_assoc_handle);
1011         }
1012
1013         if (GetHash(keys, "sig", 3, (void *) &o_sig)) {
1014                 curl_formadd(&formpost, &lastptr,
1015                         CURLFORM_COPYNAME,      "openid.sig",
1016                         CURLFORM_COPYCONTENTS,  o_sig,
1017                         CURLFORM_END);
1018                         syslog(LOG_DEBUG, "%25s : %s", "openid.sig", o_sig);
1019         }
1020
1021         if (GetHash(keys, "signed", 6, (void *) &o_signed)) {
1022                 curl_formadd(&formpost, &lastptr,
1023                         CURLFORM_COPYNAME,      "openid.signed",
1024                         CURLFORM_COPYCONTENTS,  o_signed,
1025                         CURLFORM_END);
1026                 syslog(LOG_DEBUG, "%25s : %s", "openid.signed", o_signed);
1027
1028                 num_signed_values = num_tokens(o_signed, ',');
1029                 for (i=0; i<num_signed_values; ++i) {
1030                         extract_token(k_keyname, o_signed, i, ',', sizeof k_keyname);
1031                         if (strcasecmp(k_keyname, "mode")) {    // work around phpMyID bug
1032                                 if (GetHash(keys, k_keyname, strlen(k_keyname), (void *) &k_value)) {
1033                                         snprintf(k_o_keyname, sizeof k_o_keyname, "openid.%s", k_keyname);
1034                                         curl_formadd(&formpost, &lastptr,
1035                                                 CURLFORM_COPYNAME,      k_o_keyname,
1036                                                 CURLFORM_COPYCONTENTS,  k_value,
1037                                                 CURLFORM_END);
1038                                         syslog(LOG_DEBUG, "%25s : %s", k_o_keyname, k_value);
1039                                 }
1040                                 else {
1041                                         syslog(LOG_INFO, "OpenID: signed field '%s' is missing",
1042                                                 k_keyname);
1043                                 }
1044                         }
1045                 }
1046         }
1047
1048         ReplyBuf = NewStrBuf();
1049
1050         curl = ctdl_openid_curl_easy_init(errmsg);
1051         curl_easy_setopt(curl, CURLOPT_URL, ChrPtr(oiddata->op_url));
1052         curl_easy_setopt(curl, CURLOPT_WRITEDATA, ReplyBuf);
1053         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, CurlFillStrBuf_callback);
1054         curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
1055
1056         res = curl_easy_perform(curl);
1057         if (res) {
1058                 syslog(LOG_DEBUG, "cmd_oidf() libcurl error %d: %s", res, errmsg);
1059         }
1060         curl_easy_cleanup(curl);
1061         curl_formfree(formpost);
1062
1063         if (cbmstrcasestr(ChrPtr(ReplyBuf), "is_valid:true")) {
1064                 oiddata->verified = 1;
1065         }
1066         FreeStrBuf(&ReplyBuf);
1067
1068         syslog(LOG_DEBUG, "Authentication %s.", (oiddata->verified ? "succeeded" : "failed") );
1069
1070         /* Respond to the client */
1071
1072         if (oiddata->verified) {
1073
1074                 /* If we were already logged in, attach the OpenID to the user's account */
1075                 if (CC->logged_in) {
1076                         if (attach_openid(&CC->user, oiddata->claimed_id) == 0) {
1077                                 cprintf("attach\n");
1078                                 syslog(LOG_DEBUG, "OpenID attach succeeded");
1079                         }
1080                         else {
1081                                 cprintf("fail\n");
1082                                 syslog(LOG_DEBUG, "OpenID attach failed");
1083                         }
1084                 }
1085
1086                 /* Otherwise, a user is attempting to log in using the verified OpenID */
1087                 else {
1088                         /*
1089                          * Existing user who has claimed this OpenID?
1090                          *
1091                          * Note: if you think that sending the password back over the wire is insecure,
1092                          * check your assumptions.  If someone has successfully asserted an OpenID that
1093                          * is associated with the account, they already have password equivalency and can
1094                          * login, so they could just as easily change the password, etc.
1095                          */
1096                         if (login_via_openid(oiddata->claimed_id) == 0) {
1097                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
1098                                 logged_in_response();
1099                                 syslog(LOG_DEBUG, "Logged in using previously claimed OpenID");
1100                         }
1101
1102                         /*
1103                          * If this system does not allow self-service new user registration, the
1104                          * remaining modes do not apply, so fail here and now.
1105                          */
1106                         else if (config.c_disable_newu) {
1107                                 cprintf("fail\n");
1108                                 syslog(LOG_DEBUG, "Creating user failed due to local policy");
1109                         }
1110
1111                         /*
1112                          * New user whose OpenID is verified and Simple Registration Extension is in use?
1113                          */
1114                         else if (openid_create_user_via_sreg(oiddata->claimed_id, keys) == 0) {
1115                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
1116                                 logged_in_response();
1117                                 syslog(LOG_DEBUG, "Successfully auto-created new user");
1118                         }
1119
1120                         /*
1121                          * OpenID is verified, but the desired username either was not specified or
1122                          * conflicts with an existing user.  Manual account creation is required.
1123                          */
1124                         else {
1125                                 char *desired_name = NULL;
1126                                 cprintf("verify_only\n");
1127                                 cprintf("%s\n", ChrPtr(oiddata->claimed_id));
1128                                 if (GetHash(keys, "sreg.nickname", 13, (void *) &desired_name)) {
1129                                         cprintf("%s\n", desired_name);
1130                                 }
1131                                 else {
1132                                         cprintf("\n");
1133                                 }
1134                                 syslog(LOG_DEBUG, "The desired Simple Registration name is already taken.");
1135                         }
1136                 }
1137         }
1138         else {
1139                 cprintf("fail\n");
1140         }
1141         cprintf("000\n");
1142
1143         if (oiddata->sreg_keys != NULL) {
1144                 DeleteHash(&oiddata->sreg_keys);
1145                 oiddata->sreg_keys = NULL;
1146         }
1147         oiddata->sreg_keys = keys;
1148 }
1149
1150
1151
1152 /**************************************************************************/
1153 /*                                                                        */
1154 /* Functions in this section handle module initialization and shutdown    */
1155 /*                                                                        */
1156 /**************************************************************************/
1157
1158
1159
1160
1161 CTDL_MODULE_INIT(openid_rp)
1162 {
1163         if (!threading) {
1164                 curl_global_init(CURL_GLOBAL_ALL);
1165
1166                 /* Only enable the OpenID command set when native mode authentication is in use. */
1167                 if (config.c_auth_mode == AUTHMODE_NATIVE) {
1168                         CtdlRegisterProtoHook(cmd_oids, "OIDS", "Setup OpenID authentication");
1169                         CtdlRegisterProtoHook(cmd_oidf, "OIDF", "Finalize OpenID authentication");
1170                         CtdlRegisterProtoHook(cmd_oidl, "OIDL", "List OpenIDs associated with an account");
1171                         CtdlRegisterProtoHook(cmd_oidd, "OIDD", "Detach an OpenID from an account");
1172                         CtdlRegisterProtoHook(cmd_oidc, "OIDC", "Create new user after validating OpenID");
1173                         CtdlRegisterProtoHook(cmd_oida, "OIDA", "List all OpenIDs in the database");
1174                 }
1175                 CtdlRegisterSessionHook(openid_cleanup_function, EVT_LOGOUT);
1176                 CtdlRegisterUserHook(openid_purge, EVT_PURGEUSER);
1177                 openid_level_supported = 1;     /* This module supports OpenID 1.0 only */
1178         }
1179
1180         /* return our module name for the log */
1181         return "openid_rp";
1182 }