citadel/modules/openid/serv_openid_rp.c

   1 /*
   2  * This is an implementation of OpenID 2.0 RELYING PARTY SUPPORT CURRENTLY B0RKEN AND BEING DEVEL0PZ0RED
   3  *
   4  * Copyright (c) 2007-2011 by the citadel.org team
   5  *
   6  * This program is open source software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "sysdep.h"
  21 #include <stdlib.h>
  22 #include <unistd.h>
  23 #include <stdio.h>
  24 #include <fcntl.h>
  25 #include <signal.h>
  26 #include <pwd.h>
  27 #include <errno.h>
  28 #include <sys/types.h>
  29
  30 #if TIME_WITH_SYS_TIME
  31 # include <sys/time.h>
  32 # include <time.h>
  33 #else
  34 # if HAVE_SYS_TIME_H
  35 #  include <sys/time.h>
  36 # else
  37 #  include <time.h>
  38 # endif
  39 #endif
  40
  41 #include <sys/wait.h>
  42 #include <string.h>
  43 #include <limits.h>
  44 #include <curl/curl.h>
  45 #include "ctdl_module.h"
  46 #include "config.h"
  47 #include "citserver.h"
  48 #include "user_ops.h"
  49
  50 typedef struct _ctdl_openid {
  51         StrBuf *claimed_id;
  52         StrBuf *server;
  53         int verified;
  54         HashList *sreg_keys;
  55 } ctdl_openid;
  56
  57 void Free_ctdl_openid(ctdl_openid **FreeMe)
  58 {
  59         if (*FreeMe == NULL)
  60                 return;
  61         FreeStrBuf(&(*FreeMe)->claimed_id);
  62         FreeStrBuf(&(*FreeMe)->server);
  63         DeleteHash(&(*FreeMe)->sreg_keys);
  64         free(*FreeMe);
  65         *FreeMe = NULL;
  66 }
  67
  68
  69 /*
  70  * This cleanup function blows away the temporary memory used by this module.
  71  */
  72 void openid_cleanup_function(void) {
  73         struct CitContext *CCC = CC;    /* CachedCitContext - performance boost */
  74
  75         if (CCC->openid_data != NULL) {
  76                 syslog(LOG_DEBUG, "Clearing OpenID session state");
  77                 Free_ctdl_openid((ctdl_openid **) &CCC->openid_data);
  78         }
  79 }
  80
  81
  82 /**************************************************************************/
  83 /*                                                                        */
  84 /* Functions in this section handle Citadel internal OpenID mapping stuff */
  85 /*                                                                        */
  86 /**************************************************************************/
  87
  88
  89 /*
  90  * The structure of an openid record *key* is:
  91  *
  92  * |--------------claimed_id-------------|
  93  *     (actual length of claimed id)
  94  *
  95  *
  96  * The structure of an openid record *value* is:
  97  *
  98  * |-----user_number----|------------claimed_id---------------|
  99  *    (sizeof long)          (actual length of claimed id)
 100  *
 101  */
 102
 103
 104
 105 /*
 106  * Attach an OpenID to a Citadel account
 107  */
 108 int attach_openid(struct ctdluser *who, StrBuf *claimed_id)
 109 {
 110         struct cdbdata *cdboi;
 111         long fetched_usernum;
 112         char *data;
 113         int data_len;
 114         char buf[2048];
 115
 116         if (!who) return(1);
 117         if (StrLength(claimed_id)==0) return(1);
 118
 119         /* Check to see if this OpenID is already in the database */
 120
 121         cdboi = cdb_fetch(CDB_OPENID, ChrPtr(claimed_id), StrLength(claimed_id));
 122         if (cdboi != NULL) {
 123                 memcpy(&fetched_usernum, cdboi->ptr, sizeof(long));
 124                 cdb_free(cdboi);
 125
 126                 if (fetched_usernum == who->usernum) {
 127                         syslog(LOG_INFO, "%s already associated; no action is taken", ChrPtr(claimed_id));
 128                         return(0);
 129                 }
 130                 else {
 131                         syslog(LOG_INFO, "%s already belongs to another user", ChrPtr(claimed_id));
 132                         return(3);
 133                 }
 134         }
 135
 136         /* Not already in the database, so attach it now */
 137
 138         data_len = sizeof(long) + StrLength(claimed_id) + 1;
 139         data = malloc(data_len);
 140
 141         memcpy(data, &who->usernum, sizeof(long));
 142         memcpy(&data[sizeof(long)], ChrPtr(claimed_id), StrLength(claimed_id) + 1);
 143
 144         cdb_store(CDB_OPENID, ChrPtr(claimed_id), StrLength(claimed_id), data, data_len);
 145         free(data);
 146
 147         snprintf(buf, sizeof buf, "User <%s> (#%ld) has claimed the OpenID URL %s\n",
 148                  who->fullname, who->usernum, ChrPtr(claimed_id));
 149         CtdlAideMessage(buf, "OpenID claim");
 150         syslog(LOG_INFO, "%s", buf);
 151         return(0);
 152 }
 153
 154
 155
 156 /*
 157  * When a user is being deleted, we have to delete any OpenID associations
 158  */
 159 void openid_purge(struct ctdluser *usbuf) {
 160         struct cdbdata *cdboi;
 161         HashList *keys = NULL;
 162         HashPos *HashPos;
 163         char *deleteme = NULL;
 164         long len;
 165         void *Value;
 166         const char *Key;
 167         long usernum = 0L;
 168
 169         keys = NewHash(1, NULL);
 170         if (!keys) return;
 171
 172         cdb_rewind(CDB_OPENID);
 173         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 174                 if (cdboi->len > sizeof(long)) {
 175                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 176                         if (usernum == usbuf->usernum) {
 177                                 deleteme = strdup(cdboi->ptr + sizeof(long)),
 178                                 Put(keys, deleteme, strlen(deleteme), deleteme, NULL);
 179                         }
 180                 }
 181                 cdb_free(cdboi);
 182         }
 183
 184         /* Go through the hash list, deleting keys we stored in it */
 185
 186         HashPos = GetNewHashPos(keys, 0);
 187         while (GetNextHashPos(keys, HashPos, &len, &Key, &Value)!=0)
 188         {
 189                 syslog(LOG_DEBUG, "Deleting associated OpenID <%s>", (char*)Value);
 190                 cdb_delete(CDB_OPENID, Value, strlen(Value));
 191                 /* note: don't free(Value) -- deleting the hash list will handle this for us */
 192         }
 193         DeleteHashPos(&HashPos);
 194         DeleteHash(&keys);
 195 }
 196
 197
 198 /*
 199  * List the OpenIDs associated with the currently logged in account
 200  */
 201 void cmd_oidl(char *argbuf) {
 202         struct cdbdata *cdboi;
 203         long usernum = 0L;
 204
 205         if (CtdlAccessCheck(ac_logged_in)) return;
 206         cdb_rewind(CDB_OPENID);
 207         cprintf("%d Associated OpenIDs:\n", LISTING_FOLLOWS);
 208
 209         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 210                 if (cdboi->len > sizeof(long)) {
 211                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 212                         if (usernum == CC->user.usernum) {
 213                                 cprintf("%s\n", cdboi->ptr + sizeof(long));
 214                         }
 215                 }
 216                 cdb_free(cdboi);
 217         }
 218         cprintf("000\n");
 219 }
 220
 221
 222 /*
 223  * List ALL OpenIDs in the database
 224  */
 225 void cmd_oida(char *argbuf) {
 226         struct cdbdata *cdboi;
 227         long usernum;
 228         struct ctdluser usbuf;
 229
 230         if (CtdlAccessCheck(ac_aide)) return;
 231         cdb_rewind(CDB_OPENID);
 232         cprintf("%d List of all OpenIDs in the database:\n", LISTING_FOLLOWS);
 233
 234         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 235                 if (cdboi->len > sizeof(long)) {
 236                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 237                         if (CtdlGetUserByNumber(&usbuf, usernum) != 0) {
 238                                 usbuf.fullname[0] = 0;
 239                         }
 240                         cprintf("%s|%ld|%s\n",
 241                                 cdboi->ptr + sizeof(long),
 242                                 usernum,
 243                                 usbuf.fullname
 244                         );
 245                 }
 246                 cdb_free(cdboi);
 247         }
 248         cprintf("000\n");
 249 }
 250
 251
 252 /*
 253  * Attempt to register (populate the vCard) the currently-logged-in user
 254  * using the data from Simple Registration Extension, if present.
 255  */
 256 void populate_vcard_from_sreg(HashList *sreg_keys) {
 257
 258         struct vCard *v;
 259         int pop = 0;                    /* number of fields populated */
 260         char *data = NULL;
 261         char *postcode = NULL;
 262         char *country = NULL;
 263
 264         if (!sreg_keys) return;
 265         v = vcard_new();
 266         if (!v) return;
 267
 268         if (GetHash(sreg_keys, "identity", 8, (void *) &data)) {
 269                 vcard_add_prop(v, "url;type=openid", data);
 270                 ++pop;
 271         }
 272
 273         if (GetHash(sreg_keys, "sreg.email", 10, (void *) &data)) {
 274                 vcard_add_prop(v, "email;internet", data);
 275                 ++pop;
 276         }
 277
 278         if (GetHash(sreg_keys, "sreg.nickname", 13, (void *) &data)) {
 279                 vcard_add_prop(v, "nickname", data);
 280                 ++pop;
 281         }
 282
 283         if (GetHash(sreg_keys, "sreg.fullname", 13, (void *) &data)) {
 284                 char n[256];
 285                 vcard_add_prop(v, "fn", data);
 286                 vcard_fn_to_n(n, data, sizeof n);
 287                 vcard_add_prop(v, "n", n);
 288                 ++pop;
 289         }
 290
 291         if (!GetHash(sreg_keys, "sreg.postcode", 13, (void *) &postcode)) {
 292                 postcode = NULL;
 293         }
 294
 295         if (!GetHash(sreg_keys, "sreg.country", 12, (void *) &country)) {
 296                 country = NULL;
 297         }
 298
 299         if (postcode || country) {
 300                 char adr[256];
 301                 snprintf(adr, sizeof adr, ";;;;;%s;%s",
 302                         (postcode ? postcode : ""),
 303                         (country ? country : "")
 304                 );
 305                 vcard_add_prop(v, "adr", adr);
 306                 ++pop;
 307         }
 308
 309         if (GetHash(sreg_keys, "sreg.dob", 8, (void *) &data)) {
 310                 vcard_add_prop(v, "bday", data);
 311                 ++pop;
 312         }
 313
 314         if (GetHash(sreg_keys, "sreg.gender", 11, (void *) &data)) {
 315                 vcard_add_prop(v, "x-funambol-gender", data);
 316                 ++pop;
 317         }
 318
 319         /* Only save the vCard if there is some useful data in it */
 320         if (pop > 0) {
 321                 char *ser;
 322                 ser = vcard_serialize(v);
 323                 if (ser) {
 324                         CtdlWriteObject(USERCONFIGROOM, "text/x-vcard",
 325                                 ser, strlen(ser)+1, &CC->user, 0, 0, 0
 326                         );
 327                         free(ser);
 328                 }
 329         }
 330         vcard_free(v);
 331 }
 332
 333
 334 /*
 335  * Create a new user account, manually specifying the name, after successfully
 336  * verifying an OpenID (which will of course be attached to the account)
 337  */
 338 void cmd_oidc(char *argbuf) {
 339         ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
 340
 341         if (!oiddata) {
 342                 cprintf("%d You have not verified an OpenID yet.\n", ERROR);
 343                 return;
 344         }
 345
 346         if (!oiddata->verified) {
 347                 cprintf("%d You have not verified an OpenID yet.\n", ERROR);
 348                 return;
 349         }
 350
 351         /* We can make the semantics of OIDC exactly the same as NEWU, simply
 352          * by _calling_ cmd_newu() and letting it run.  Very clever!
 353          */
 354         cmd_newu(argbuf);
 355
 356         /* Now, if this logged us in, we have to attach the OpenID */
 357         if (CC->logged_in) {
 358                 attach_openid(&CC->user, oiddata->claimed_id);
 359                 if (oiddata->sreg_keys != NULL) {
 360                         populate_vcard_from_sreg(oiddata->sreg_keys);
 361                 }
 362         }
 363
 364 }
 365
 366
 367 /*
 368  * Detach an OpenID from the currently logged in account
 369  */
 370 void cmd_oidd(char *argbuf) {
 371         struct cdbdata *cdboi;
 372         char id_to_detach[1024];
 373         int this_is_mine = 0;
 374         long usernum = 0L;
 375
 376         if (CtdlAccessCheck(ac_logged_in)) return;
 377         extract_token(id_to_detach, argbuf, 0, '|', sizeof id_to_detach);
 378         if (IsEmptyStr(id_to_detach)) {
 379                 cprintf("%d An empty OpenID URL is not allowed.\n", ERROR + ILLEGAL_VALUE);
 380         }
 381
 382         cdb_rewind(CDB_OPENID);
 383         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 384                 if (cdboi->len > sizeof(long)) {
 385                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 386                         if (usernum == CC->user.usernum) {
 387                                 this_is_mine = 1;
 388                         }
 389                 }
 390                 cdb_free(cdboi);
 391         }
 392
 393         if (!this_is_mine) {
 394                 cprintf("%d That OpenID was not found or not associated with your account.\n",
 395                         ERROR + ILLEGAL_VALUE);
 396                 return;
 397         }
 398
 399         cdb_delete(CDB_OPENID, id_to_detach, strlen(id_to_detach));
 400         cprintf("%d %s detached from your account.\n", CIT_OK, id_to_detach);
 401 }
 402
 403
 404
 405 /*
 406  * Attempt to auto-create a new Citadel account using the nickname from Simple Registration Extension
 407  */
 408 int openid_create_user_via_sreg(StrBuf *claimed_id, HashList *sreg_keys)
 409 {
 410         char *desired_name = NULL;
 411         char new_password[32];
 412         long len;
 413
 414         if (config.c_auth_mode != AUTHMODE_NATIVE) return(1);
 415         if (config.c_disable_newu) return(2);
 416         if (CC->logged_in) return(3);
 417         if (!GetHash(sreg_keys, "sreg.nickname", 13, (void *) &desired_name)) return(4);
 418
 419         syslog(LOG_DEBUG, "The desired account name is <%s>", desired_name);
 420
 421         len = cutuserkey(desired_name);
 422         if (!CtdlGetUser(&CC->user, desired_name)) {
 423                 syslog(LOG_DEBUG, "<%s> is already taken by another user.", desired_name);
 424                 memset(&CC->user, 0, sizeof(struct ctdluser));
 425                 return(5);
 426         }
 427
 428         /* The desired account name is available.  Create the account and log it in! */
 429         if (create_user(desired_name, len, 1)) return(6);
 430
 431         snprintf(new_password, sizeof new_password, "%08lx%08lx", random(), random());
 432         CtdlSetPassword(new_password);
 433         attach_openid(&CC->user, claimed_id);
 434         populate_vcard_from_sreg(sreg_keys);
 435         return(0);
 436 }
 437
 438
 439 /*
 440  * If a user account exists which is associated with the Claimed ID, log it in and return zero.
 441  * Otherwise it returns nonzero.
 442  */
 443 int login_via_openid(StrBuf *claimed_id)
 444 {
 445         struct cdbdata *cdboi;
 446         long usernum = 0;
 447
 448         cdboi = cdb_fetch(CDB_OPENID, ChrPtr(claimed_id), StrLength(claimed_id));
 449         if (cdboi == NULL) {
 450                 return(-1);
 451         }
 452
 453         memcpy(&usernum, cdboi->ptr, sizeof(long));
 454         cdb_free(cdboi);
 455
 456         if (!CtdlGetUserByNumber(&CC->user, usernum)) {
 457                 /* Now become the user we just created */
 458                 safestrncpy(CC->curr_user, CC->user.fullname, sizeof CC->curr_user);
 459                 do_login();
 460                 return(0);
 461         }
 462         else {
 463                 memset(&CC->user, 0, sizeof(struct ctdluser));
 464                 return(-1);
 465         }
 466 }
 467
 468
 469
 470
 471 /**************************************************************************/
 472 /*                                                                        */
 473 /* Functions in this section handle OpenID protocol                       */
 474 /*                                                                        */
 475 /**************************************************************************/
 476
 477
 478 /*
 479  * Locate a <link> tag and, given its 'rel=' parameter, return its 'href' parameter
 480  */
 481 void extract_link(StrBuf *target_buf, const char *rel, long repllen, StrBuf *source_buf)
 482 {
 483         int i;
 484         const char *ptr;
 485         const char *href_start = NULL;
 486         const char *href_end = NULL;
 487         const char *link_tag_start = NULL;
 488         const char *link_tag_end = NULL;
 489         const char *rel_start = NULL;
 490         const char *rel_end = NULL;
 491
 492         if (!target_buf) return;
 493         if (!rel) return;
 494         if (!source_buf) return;
 495
 496         ptr = ChrPtr(source_buf);
 497
 498         FlushStrBuf(target_buf);
 499         while (ptr = cbmstrcasestr(ptr, "<link"), ptr != NULL) {
 500
 501                 link_tag_start = ptr;
 502                 link_tag_end = strchr(ptr, '>');
 503                 if (link_tag_end == NULL)
 504                         break;
 505                 for (i=0; i < 1; i++ ){
 506                         rel_start = cbmstrcasestr(link_tag_start, "rel=");
 507                         if ((rel_start == NULL) ||
 508                             (rel_start > link_tag_end))
 509                                 continue;
 510
 511                         rel_start = strchr(rel_start, '\"');
 512                         if ((rel_start == NULL) ||
 513                             (rel_start > link_tag_end))
 514                                 continue;
 515                         ++rel_start;
 516                         rel_end = strchr(rel_start, '\"');
 517                         if ((rel_end == NULL) ||
 518                             (rel_end == rel_start) ||
 519                             (rel_end >= link_tag_end) )
 520                                 continue;
 521                         if (strncasecmp(rel, rel_start, repllen)!= 0)
 522                                 continue; /* didn't match? never mind... */
 523
 524                         href_start = cbmstrcasestr(link_tag_start, "href=");
 525                         if ((href_start == NULL) ||
 526                             (href_start >= link_tag_end))
 527                                 continue;
 528                         href_start = strchr(href_start, '\"');
 529                         if ((href_start == NULL) |
 530                             (href_start >= link_tag_end))
 531                                 continue;
 532                         ++href_start;
 533                         href_end = strchr(href_start, '\"');
 534                         if ((href_end == NULL) ||
 535                             (href_end == href_start) ||
 536                             (href_start >= link_tag_end))
 537                                 continue;
 538                         StrBufPlain(target_buf, href_start, href_end - href_start);
 539                 }
 540                 ptr = link_tag_end;
 541         }
 542 }
 543
 544
 545 /*
 546  * Begin an HTTP fetch (returns number of bytes actually fetched, or -1 for error) using libcurl.
 547  */
 548 int fetch_http(StrBuf *url, StrBuf **target_buf)
 549 {
 550         StrBuf *ReplyBuf;
 551         CURL *curl;
 552         CURLcode res;
 553         char errmsg[1024] = "";
 554         char *effective_url = NULL;
 555
 556         if (StrLength(url) <=0 ) return(-1);
 557         ReplyBuf = *target_buf = NewStrBuf ();
 558         if (ReplyBuf == 0) return(-1);
 559
 560         curl = curl_easy_init();
 561         if (!curl) {
 562                 syslog(LOG_ALERT, "Unable to initialize libcurl.");
 563                 return(-1);
 564         }
 565
 566         curl_easy_setopt(curl, CURLOPT_URL, ChrPtr(url));
 567         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 568         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 569
 570         curl_easy_setopt(curl, CURLOPT_WRITEDATA, ReplyBuf);
 571         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, CurlFillStrBuf_callback);
 572
 573         curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
 574         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 575 #ifdef CURLOPT_HTTP_CONTENT_DECODING
 576         curl_easy_setopt(curl, CURLOPT_HTTP_CONTENT_DECODING, 1);
 577         curl_easy_setopt(curl, CURLOPT_ENCODING, "");
 578 #endif
 579         curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
 580         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 180);           /* die after 180 seconds */
 581         if (
 582                 (!IsEmptyStr(config.c_ip_addr))
 583                 && (strcmp(config.c_ip_addr, "*"))
 584                 && (strcmp(config.c_ip_addr, "::"))
 585                 && (strcmp(config.c_ip_addr, "0.0.0.0"))
 586         ) {
 587                 curl_easy_setopt(curl, CURLOPT_INTERFACE, config.c_ip_addr);
 588         }
 589         res = curl_easy_perform(curl);
 590         if (res) {
 591                 syslog(LOG_DEBUG, "libcurl error %d: %s", res, errmsg);
 592         }
 593         curl_easy_getinfo(curl, CURLINFO_EFFECTIVE_URL, &effective_url);
 594         StrBufPlain(url, effective_url, -1);
 595
 596         curl_easy_cleanup(curl);
 597         return StrLength(ReplyBuf);
 598 }
 599
 600
 601 /*
 602  * Attempt to perform YADIS discovery.
 603  * If successful, returns nonzero and fills the session's claimed ID blah FIXME this comment
 604  * If YADIS fails, returns 0 and does nothing else.
 605  */
 606 int perform_yadis_discovery(StrBuf *YadisURL) {
 607         int docbytes = (-1);
 608         StrBuf *ReplyBuf = NULL;
 609
 610         docbytes = fetch_http(YadisURL, &ReplyBuf);
 611         if (docbytes < 0) {
 612                 return(0);
 613         }
 614         if (docbytes == 0) {
 615                 FreeStrBuf(&ReplyBuf);
 616                 return(0);
 617         }
 618
 619         /* ok we have something here.  is it an XRDS document? */
 620
 621         /* FIXME finish this */
 622
 623         FreeStrBuf(&ReplyBuf);
 624         return(0);
 625 }
 626
 627
 628 /*
 629  * Setup an OpenID authentication
 630  */
 631 void cmd_oids(char *argbuf) {
 632         const char *Pos = NULL;
 633         StrBuf *ArgBuf = NULL;
 634         StrBuf *ReplyBuf = NULL;
 635         StrBuf *return_to = NULL;
 636         StrBuf *trust_root = NULL;
 637         StrBuf *openid_delegate = NULL;
 638         StrBuf *RedirectUrl = NULL;
 639         struct CitContext *CCC = CC;    /* CachedCitContext - performance boost */
 640         ctdl_openid *oiddata;
 641
 642         Free_ctdl_openid ((ctdl_openid**)&CCC->openid_data);
 643
 644         CCC->openid_data = oiddata = malloc(sizeof(ctdl_openid));
 645         if (oiddata == NULL) {
 646                 cprintf("%d malloc failed\n", ERROR + INTERNAL_ERROR);
 647                 return;
 648         }
 649         memset(oiddata, 0, sizeof(ctdl_openid));
 650         CCC->openid_data = (void *) oiddata;
 651
 652         ArgBuf = NewStrBufPlain(argbuf, -1);
 653
 654         oiddata->verified = 0;
 655         oiddata->claimed_id = NewStrBufPlain(NULL, StrLength(ArgBuf));
 656         trust_root = NewStrBufPlain(NULL, StrLength(ArgBuf));
 657         return_to = NewStrBufPlain(NULL, StrLength(ArgBuf));
 658
 659         StrBufExtract_NextToken(oiddata->claimed_id, ArgBuf, &Pos, '|');
 660         StrBufExtract_NextToken(return_to, ArgBuf, &Pos, '|');
 661         StrBufExtract_NextToken(trust_root, ArgBuf, &Pos, '|');
 662
 663         syslog(LOG_DEBUG, "User-Supplied Identifier is: %s", ChrPtr(oiddata->claimed_id));
 664
 665
 666         /********** OpenID 2.0 section 7.3 - Discovery **********/
 667
 668         /* First we're supposed to attempt XRI.  What the fuck is XRI and why do I care about it? */
 669
 670         /* Second we attempt YADIS.  Google uses this so we'd better do our best to implement it. */
 671         int yadis_succeeded = perform_yadis_discovery(oiddata->claimed_id);
 672
 673         /* Third we attempt HTML-based discovery.  Here we go! */
 674         if (    (yadis_succeeded == 0)
 675                 && (fetch_http(oiddata->claimed_id, &ReplyBuf) > 0)
 676                 && (StrLength(ReplyBuf) > 0)
 677         ) {
 678                 openid_delegate = NewStrBuf();
 679                 oiddata->server = NewStrBuf();
 680                 extract_link(oiddata->server, HKEY("openid.server"), ReplyBuf);
 681                 extract_link(openid_delegate, HKEY("openid.delegate"), ReplyBuf);
 682
 683                 if (StrLength(oiddata->server) == 0) {
 684                         cprintf("%d There is no OpenID identity provider at this URL.\n", ERROR);
 685                         FreeStrBuf(&ArgBuf);
 686                         FreeStrBuf(&ReplyBuf);
 687                         FreeStrBuf(&return_to);
 688                         FreeStrBuf(&trust_root);
 689                         FreeStrBuf(&openid_delegate);
 690                         FreeStrBuf(&RedirectUrl);
 691                         return;
 692                 }
 693
 694                 /* Empty delegate is legal; we just use the openid_url instead */
 695                 if (StrLength(openid_delegate) == 0) {
 696                         StrBufPlain(openid_delegate, SKEY(oiddata->claimed_id));
 697                 }
 698
 699                 /* Assemble a URL to which the user-agent will be redirected. */
 700
 701                 RedirectUrl = NewStrBufDup(oiddata->server);
 702
 703                 StrBufAppendBufPlain(RedirectUrl, HKEY("?openid.mode=checkid_setup"
 704                                                        "&openid.identity="), 0);
 705                 StrBufUrlescAppend(RedirectUrl, openid_delegate, NULL);
 706
 707                 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.return_to="), 0);
 708                 StrBufUrlescAppend(RedirectUrl, return_to, NULL);
 709
 710                 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.trust_root="), 0);
 711                 StrBufUrlescAppend(RedirectUrl, trust_root, NULL);
 712
 713                 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.sreg.optional="), 0);
 714                 StrBufUrlescAppend(RedirectUrl, NULL, "nickname,email,fullname,postcode,country,dob,gender");
 715
 716                 cprintf("%d %s\n", CIT_OK, ChrPtr(RedirectUrl));
 717
 718                 FreeStrBuf(&ArgBuf);
 719                 FreeStrBuf(&ReplyBuf);
 720                 FreeStrBuf(&return_to);
 721                 FreeStrBuf(&trust_root);
 722                 FreeStrBuf(&openid_delegate);
 723                 FreeStrBuf(&RedirectUrl);
 724
 725                 return;
 726         }
 727
 728         FreeStrBuf(&ArgBuf);
 729         FreeStrBuf(&ReplyBuf);
 730         FreeStrBuf(&return_to);
 731         FreeStrBuf(&trust_root);
 732         FreeStrBuf(&openid_delegate);
 733         FreeStrBuf(&RedirectUrl);
 734
 735         cprintf("%d Unable to fetch OpenID URL\n", ERROR);
 736 }
 737
 738
 739
 740
 741
 742 /*
 743  * Finalize an OpenID authentication
 744  */
 745 void cmd_oidf(char *argbuf) {
 746         long len;
 747         char buf[2048];
 748         char thiskey[1024];
 749         char thisdata[1024];
 750         HashList *keys = NULL;
 751         ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
 752
 753         if (oiddata == NULL) {
 754                 cprintf("%d run OIDS first.\n", ERROR + INTERNAL_ERROR);
 755                 return;
 756         }
 757         if (StrLength(oiddata->server) == 0){
 758                 cprintf("%d need a remote server to authenticate against\n", ERROR + ILLEGAL_VALUE);
 759                 return;
 760         }
 761         keys = NewHash(1, NULL);
 762         if (!keys) {
 763                 cprintf("%d NewHash() failed\n", ERROR + INTERNAL_ERROR);
 764                 return;
 765         }
 766         cprintf("%d Transmit OpenID data now\n", START_CHAT_MODE);
 767
 768         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 769                 len = extract_token(thiskey, buf, 0, '|', sizeof thiskey);
 770                 if (len < 0)
 771                         len = sizeof(thiskey) - 1;
 772                 extract_token(thisdata, buf, 1, '|', sizeof thisdata);
 773                 syslog(LOG_DEBUG, "%s: ["SIZE_T_FMT"] %s", thiskey, strlen(thisdata), thisdata);
 774                 Put(keys, thiskey, len, strdup(thisdata), NULL);
 775         }
 776
 777
 778         /* Now that we have all of the parameters, we have to validate the signature against the server */
 779         syslog(LOG_DEBUG, "About to validate the signature...");
 780
 781         CURL *curl;
 782         CURLcode res;
 783         struct curl_httppost *formpost = NULL;
 784         struct curl_httppost *lastptr = NULL;
 785         char errmsg[1024] = "";
 786         char *o_assoc_handle = NULL;
 787         char *o_sig = NULL;
 788         char *o_signed = NULL;
 789         int num_signed_values;
 790         int i;
 791         char k_keyname[128];
 792         char k_o_keyname[128];
 793         char *k_value = NULL;
 794         StrBuf *ReplyBuf;
 795
 796         curl_formadd(&formpost, &lastptr,
 797                 CURLFORM_COPYNAME,      "openid.mode",
 798                 CURLFORM_COPYCONTENTS,  "check_authentication",
 799                 CURLFORM_END);
 800         syslog(LOG_DEBUG, "%25s : %s", "openid.mode", "check_authentication");
 801
 802         if (GetHash(keys, "assoc_handle", 12, (void *) &o_assoc_handle)) {
 803                 curl_formadd(&formpost, &lastptr,
 804                         CURLFORM_COPYNAME,      "openid.assoc_handle",
 805                         CURLFORM_COPYCONTENTS,  o_assoc_handle,
 806                         CURLFORM_END);
 807                 syslog(LOG_DEBUG, "%25s : %s", "openid.assoc_handle", o_assoc_handle);
 808         }
 809
 810         if (GetHash(keys, "sig", 3, (void *) &o_sig)) {
 811                 curl_formadd(&formpost, &lastptr,
 812                         CURLFORM_COPYNAME,      "openid.sig",
 813                         CURLFORM_COPYCONTENTS,  o_sig,
 814                         CURLFORM_END);
 815                         syslog(LOG_DEBUG, "%25s : %s", "openid.sig", o_sig);
 816         }
 817
 818         if (GetHash(keys, "signed", 6, (void *) &o_signed)) {
 819                 curl_formadd(&formpost, &lastptr,
 820                         CURLFORM_COPYNAME,      "openid.signed",
 821                         CURLFORM_COPYCONTENTS,  o_signed,
 822                         CURLFORM_END);
 823                 syslog(LOG_DEBUG, "%25s : %s", "openid.signed", o_signed);
 824
 825                 num_signed_values = num_tokens(o_signed, ',');
 826                 for (i=0; i<num_signed_values; ++i) {
 827                         extract_token(k_keyname, o_signed, i, ',', sizeof k_keyname);
 828                         if (strcasecmp(k_keyname, "mode")) {    // work around phpMyID bug
 829                                 if (GetHash(keys, k_keyname, strlen(k_keyname), (void *) &k_value)) {
 830                                         snprintf(k_o_keyname, sizeof k_o_keyname, "openid.%s", k_keyname);
 831                                         curl_formadd(&formpost, &lastptr,
 832                                                 CURLFORM_COPYNAME,      k_o_keyname,
 833                                                 CURLFORM_COPYCONTENTS,  k_value,
 834                                                 CURLFORM_END);
 835                                         syslog(LOG_DEBUG, "%25s : %s", k_o_keyname, k_value);
 836                                 }
 837                                 else {
 838                                         syslog(LOG_INFO, "OpenID: signed field '%s' is missing",
 839                                                 k_keyname);
 840                                 }
 841                         }
 842                 }
 843         }
 844
 845         ReplyBuf = NewStrBuf();
 846
 847         curl = curl_easy_init();
 848         curl_easy_setopt(curl, CURLOPT_URL, ChrPtr(oiddata->server));
 849         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 850         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 851
 852         curl_easy_setopt(curl, CURLOPT_WRITEDATA, ReplyBuf);
 853         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, CurlFillStrBuf_callback);
 854         curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 855         curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
 856         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 857 #ifdef CURLOPT_HTTP_CONTENT_DECODING
 858         curl_easy_setopt(curl, CURLOPT_HTTP_CONTENT_DECODING, 1);
 859         curl_easy_setopt(curl, CURLOPT_ENCODING, "");
 860 #endif
 861         curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
 862         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 180);           /* die after 180 seconds */
 863         if (
 864                 (!IsEmptyStr(config.c_ip_addr))
 865                 && (strcmp(config.c_ip_addr, "*"))
 866                 && (strcmp(config.c_ip_addr, "::"))
 867                 && (strcmp(config.c_ip_addr, "0.0.0.0"))
 868         ) {
 869                 curl_easy_setopt(curl, CURLOPT_INTERFACE, config.c_ip_addr);
 870         }
 871
 872         res = curl_easy_perform(curl);
 873         if (res) {
 874                 syslog(LOG_DEBUG, "cmd_oidf() libcurl error %d: %s", res, errmsg);
 875         }
 876         curl_easy_cleanup(curl);
 877         curl_formfree(formpost);
 878
 879         if (cbmstrcasestr(ChrPtr(ReplyBuf), "is_valid:true")) {
 880                 oiddata->verified = 1;
 881         }
 882         FreeStrBuf(&ReplyBuf);
 883
 884         syslog(LOG_DEBUG, "Authentication %s.", (oiddata->verified ? "succeeded" : "failed") );
 885
 886         /* Respond to the client */
 887
 888         if (oiddata->verified) {
 889
 890                 /* If we were already logged in, attach the OpenID to the user's account */
 891                 if (CC->logged_in) {
 892                         if (attach_openid(&CC->user, oiddata->claimed_id) == 0) {
 893                                 cprintf("attach\n");
 894                                 syslog(LOG_DEBUG, "OpenID attach succeeded");
 895                         }
 896                         else {
 897                                 cprintf("fail\n");
 898                                 syslog(LOG_DEBUG, "OpenID attach failed");
 899                         }
 900                 }
 901
 902                 /* Otherwise, a user is attempting to log in using the verified OpenID */
 903                 else {
 904                         /*
 905                          * Existing user who has claimed this OpenID?
 906                          *
 907                          * Note: if you think that sending the password back over the wire is insecure,
 908                          * check your assumptions.  If someone has successfully asserted an OpenID that
 909                          * is associated with the account, they already have password equivalency and can
 910                          * login, so they could just as easily change the password, etc.
 911                          */
 912                         if (login_via_openid(oiddata->claimed_id) == 0) {
 913                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
 914                                 logged_in_response();
 915                                 syslog(LOG_DEBUG, "Logged in using previously claimed OpenID");
 916                         }
 917
 918                         /*
 919                          * If this system does not allow self-service new user registration, the
 920                          * remaining modes do not apply, so fail here and now.
 921                          */
 922                         else if (config.c_disable_newu) {
 923                                 cprintf("fail\n");
 924                                 syslog(LOG_DEBUG, "Creating user failed due to local policy");
 925                         }
 926
 927                         /*
 928                          * New user whose OpenID is verified and Simple Registration Extension is in use?
 929                          */
 930                         else if (openid_create_user_via_sreg(oiddata->claimed_id, keys) == 0) {
 931                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
 932                                 logged_in_response();
 933                                 syslog(LOG_DEBUG, "Successfully auto-created new user");
 934                         }
 935
 936                         /*
 937                          * OpenID is verified, but the desired username either was not specified or
 938                          * conflicts with an existing user.  Manual account creation is required.
 939                          */
 940                         else {
 941                                 char *desired_name = NULL;
 942                                 cprintf("verify_only\n");
 943                                 cprintf("%s\n", ChrPtr(oiddata->claimed_id));
 944                                 if (GetHash(keys, "sreg.nickname", 13, (void *) &desired_name)) {
 945                                         cprintf("%s\n", desired_name);
 946                                 }
 947                                 else {
 948                                         cprintf("\n");
 949                                 }
 950                                 syslog(LOG_DEBUG, "The desired Simple Registration name is already taken.");
 951                         }
 952                 }
 953         }
 954         else {
 955                 cprintf("fail\n");
 956         }
 957         cprintf("000\n");
 958
 959         if (oiddata->sreg_keys != NULL) {
 960                 DeleteHash(&oiddata->sreg_keys);
 961                 oiddata->sreg_keys = NULL;
 962         }
 963         oiddata->sreg_keys = keys;
 964 }
 965
 966
 967
 968 /**************************************************************************/
 969 /*                                                                        */
 970 /* Functions in this section handle module initialization and shutdown    */
 971 /*                                                                        */
 972 /**************************************************************************/
 973
 974
 975
 976
 977 CTDL_MODULE_INIT(openid_rp)
 978 {
 979         if (!threading) {
 980                 curl_global_init(CURL_GLOBAL_ALL);
 981
 982                 /* Only enable the OpenID command set when native mode authentication is in use. */
 983                 if (config.c_auth_mode == AUTHMODE_NATIVE) {
 984                         CtdlRegisterProtoHook(cmd_oids, "OIDS", "Setup OpenID authentication");
 985                         CtdlRegisterProtoHook(cmd_oidf, "OIDF", "Finalize OpenID authentication");
 986                         CtdlRegisterProtoHook(cmd_oidl, "OIDL", "List OpenIDs associated with an account");
 987                         CtdlRegisterProtoHook(cmd_oidd, "OIDD", "Detach an OpenID from an account");
 988                         CtdlRegisterProtoHook(cmd_oidc, "OIDC", "Create new user after validating OpenID");
 989                         CtdlRegisterProtoHook(cmd_oida, "OIDA", "List all OpenIDs in the database");
 990                 }
 991                 CtdlRegisterSessionHook(openid_cleanup_function, EVT_LOGOUT);
 992                 CtdlRegisterUserHook(openid_purge, EVT_PURGEUSER);
 993                 openid_level_supported = 1;     /* This module supports OpenID 1.0 only */
 994         }
 995
 996         /* return our module name for the log */
 997         return "openid_rp";
 998 }