citadel/modules/openid/serv_openid_rp.c

   1 /*
   2  * $Id$
   3  *
   4  * This is an implementation of OpenID 1.1 Relying Party support, in stateless mode.
   5  *
   6  */
   7
   8 #include "sysdep.h"
   9 #include <stdlib.h>
  10 #include <unistd.h>
  11 #include <stdio.h>
  12 #include <fcntl.h>
  13 #include <signal.h>
  14 #include <pwd.h>
  15 #include <errno.h>
  16 #include <sys/types.h>
  17
  18 #if TIME_WITH_SYS_TIME
  19 # include <sys/time.h>
  20 # include <time.h>
  21 #else
  22 # if HAVE_SYS_TIME_H
  23 #  include <sys/time.h>
  24 # else
  25 #  include <time.h>
  26 # endif
  27 #endif
  28
  29 #include <sys/wait.h>
  30 #include <string.h>
  31 #include <limits.h>
  32 #include <curl/curl.h>
  33 #include "ctdl_module.h"
  34 #include "config.h"
  35 #include "citserver.h"
  36 #include "user_ops.h"
  37
  38 struct ctdl_openid {
  39         char claimed_id[1024];
  40         char server[1024];
  41         int verified;
  42         HashList *sreg_keys;
  43 };
  44
  45
  46
  47
  48
  49 /**************************************************************************/
  50 /*                                                                        */
  51 /* Functions in this section handle Citadel internal OpenID mapping stuff */
  52 /*                                                                        */
  53 /**************************************************************************/
  54
  55
  56 /*
  57  * The structure of an openid record *key* is:
  58  *
  59  * |--------------claimed_id-------------|
  60  *     (actual length of claimed id)
  61  *
  62  *
  63  * The structure of an openid record *value* is:
  64  *
  65  * |-----user_number----|------------claimed_id---------------|
  66  *    (sizeof long)          (actual length of claimed id)
  67  *
  68  */
  69
  70
  71
  72 /*
  73  * Attach an OpenID to a Citadel account
  74  */
  75 int attach_openid(struct ctdluser *who, char *claimed_id)
  76 {
  77         struct cdbdata *cdboi;
  78         long fetched_usernum;
  79         char *data;
  80         int data_len;
  81         char buf[2048];
  82
  83         if (!who) return(1);
  84         if (!claimed_id) return(1);
  85         if (IsEmptyStr(claimed_id)) return(1);
  86
  87         /* Check to see if this OpenID is already in the database */
  88
  89         cdboi = cdb_fetch(CDB_OPENID, claimed_id, strlen(claimed_id));
  90         if (cdboi != NULL) {
  91                 memcpy(&fetched_usernum, cdboi->ptr, sizeof(long));
  92                 cdb_free(cdboi);
  93
  94                 if (fetched_usernum == who->usernum) {
  95                         CtdlLogPrintf(CTDL_INFO, "%s already associated; no action is taken\n", claimed_id);
  96                         return(0);
  97                 }
  98                 else {
  99                         CtdlLogPrintf(CTDL_INFO, "%s already belongs to another user\n", claimed_id);
 100                         return(3);
 101                 }
 102         }
 103
 104         /* Not already in the database, so attach it now */
 105
 106         data_len = sizeof(long) + strlen(claimed_id) + 1;
 107         data = malloc(data_len);
 108
 109         memcpy(data, &who->usernum, sizeof(long));
 110         memcpy(&data[sizeof(long)], claimed_id, strlen(claimed_id) + 1);
 111
 112         cdb_store(CDB_OPENID, claimed_id, strlen(claimed_id), data, data_len);
 113         free(data);
 114
 115         snprintf(buf, sizeof buf, "User <%s> (#%ld) has claimed the OpenID URL %s\n",
 116                 who->fullname, who->usernum, claimed_id);
 117         aide_message(buf, "OpenID claim");
 118         CtdlLogPrintf(CTDL_INFO, "%s", buf);
 119         return(0);
 120 }
 121
 122
 123
 124 /*
 125  * When a user is being deleted, we have to delete any OpenID associations
 126  */
 127 void openid_purge(struct ctdluser *usbuf) {
 128         struct cdbdata *cdboi;
 129         HashList *keys = NULL;
 130         HashPos *HashPos;
 131         char *deleteme = NULL;
 132         long len;
 133         void *Value;
 134         char *Key;
 135
 136         keys = NewHash(1, NULL);
 137         if (!keys) return;
 138
 139
 140         cdb_rewind(CDB_OPENID);
 141         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 142                 if (cdboi->len > sizeof(long)) {
 143                         if (((long)*(cdboi->ptr)) == usbuf->usernum) {
 144                                 deleteme = strdup(cdboi->ptr + sizeof(long)),
 145                                 Put(keys, deleteme, strlen(deleteme), deleteme, generic_free_handler);
 146                         }
 147                 }
 148                 cdb_free(cdboi);
 149         }
 150
 151         /* Go through the hash list, deleting keys we stored in it */
 152
 153         HashPos = GetNewHashPos();
 154         while (GetNextHashPos(keys, HashPos, &len, &Key, &Value)!=0)
 155         {
 156                 CtdlLogPrintf(CTDL_DEBUG, "Deleting associated OpenID <%s>\n", Value);
 157                 cdb_delete(CDB_OPENID, Value, strlen(Value));
 158                 /* note: don't free(Value) -- deleting the hash list will handle this for us */
 159         }
 160         DeleteHashPos(&HashPos);
 161         DeleteHash(&keys);
 162 }
 163
 164
 165
 166 /*
 167  * List the OpenIDs associated with the currently logged in account
 168  */
 169 void cmd_oidl(char *argbuf) {
 170         struct cdbdata *cdboi;
 171
 172         if (CtdlAccessCheck(ac_logged_in)) return;
 173         cdb_rewind(CDB_OPENID);
 174         cprintf("%d Associated OpenIDs:\n", LISTING_FOLLOWS);
 175
 176         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 177                 if (cdboi->len > sizeof(long)) {
 178                         if (((long)*(cdboi->ptr)) == CC->user.usernum) {
 179                                 cprintf("%s\n", cdboi->ptr + sizeof(long));
 180                         }
 181                 }
 182                 cdb_free(cdboi);
 183         }
 184         cprintf("000\n");
 185 }
 186
 187
 188 /*
 189  * Attempt to register (populate the vCard) the currently-logged-in user
 190  * using the data from Simple Registration Extension, if present.
 191  */
 192 void populate_vcard_from_sreg(HashList *sreg_keys) {
 193
 194         struct vCard *v;
 195         int pop = 0;                    /* number of fields populated */
 196         char *data = NULL;
 197         char *postcode = NULL;
 198         char *country = NULL;
 199
 200         if (!sreg_keys) return;
 201         v = vcard_new();
 202         if (!v) return;
 203
 204         if (GetHash(sreg_keys, "identity", 8, (void *) &data)) {
 205                 vcard_add_prop(v, "url;type=openid", data);
 206                 ++pop;
 207         }
 208
 209         if (GetHash(sreg_keys, "sreg.email", 10, (void *) &data)) {
 210                 vcard_add_prop(v, "email;internet", data);
 211                 ++pop;
 212         }
 213
 214         if (GetHash(sreg_keys, "sreg.nickname", 13, (void *) &data)) {
 215                 vcard_add_prop(v, "nickname", data);
 216                 ++pop;
 217         }
 218
 219         if (GetHash(sreg_keys, "sreg.fullname", 13, (void *) &data)) {
 220                 char n[256];
 221                 vcard_add_prop(v, "fn", data);
 222                 vcard_fn_to_n(n, data, sizeof n);
 223                 vcard_add_prop(v, "n", n);
 224                 ++pop;
 225         }
 226
 227         if (!GetHash(sreg_keys, "sreg.postcode", 13, (void *) &postcode)) {
 228                 postcode = NULL;
 229         }
 230
 231         if (!GetHash(sreg_keys, "sreg.country", 12, (void *) &country)) {
 232                 country = NULL;
 233         }
 234
 235         if (postcode || country) {
 236                 char adr[256];
 237                 snprintf(adr, sizeof adr, ";;;;;%s;%s",
 238                         (postcode ? postcode : ""),
 239                         (country ? country : "")
 240                 );
 241                 vcard_add_prop(v, "adr", adr);
 242                 ++pop;
 243         }
 244
 245         if (GetHash(sreg_keys, "sreg.dob", 8, (void *) &data)) {
 246                 vcard_add_prop(v, "bday", data);
 247                 ++pop;
 248         }
 249
 250         if (GetHash(sreg_keys, "sreg.gender", 11, (void *) &data)) {
 251                 vcard_add_prop(v, "x-funambol-gender", data);
 252                 ++pop;
 253         }
 254
 255         /* Only save the vCard if there is some useful data in it */
 256         if (pop > 0) {
 257                 char temp[PATH_MAX];
 258                 FILE *fp;
 259                 char *ser;
 260
 261                 CtdlMakeTempFileName(temp, sizeof temp);
 262                 ser = vcard_serialize(v);
 263                 if (ser) {
 264                         fp = fopen(temp, "w");
 265                         if (fp) {
 266                                 fwrite(ser, strlen(ser), 1, fp);
 267                                 fclose(fp);
 268                                 CtdlWriteObject(USERCONFIGROOM, "text/x-vcard", temp, &CC->user, 0, 0, 0);
 269                                 unlink(temp);
 270                         }
 271                         free(ser);
 272                 }
 273         }
 274         vcard_free(v);
 275 }
 276
 277
 278 /*
 279  * Create a new user account, manually specifying the name, after successfully
 280  * verifying an OpenID (which will of course be attached to the account)
 281  */
 282 void cmd_oidc(char *argbuf) {
 283         struct ctdl_openid *oiddata = (struct ctdl_openid *) CC->openid_data;
 284
 285         if (!oiddata->verified) {
 286                 cprintf("%d You have not verified an OpenID yet.\n", ERROR);
 287                 return;
 288         }
 289
 290         /* We can make the semantics of OIDC exactly the same as NEWU, simply
 291          * by _calling_ cmd_newu() and letting it run.  Very clever!
 292          */
 293         cmd_newu(argbuf);
 294
 295         /* Now, if this logged us in, we have to attach the OpenID */
 296         if (CC->logged_in) {
 297                 attach_openid(&CC->user, oiddata->claimed_id);
 298                 if (oiddata->sreg_keys != NULL) {
 299                         populate_vcard_from_sreg(oiddata->sreg_keys);
 300                 }
 301         }
 302
 303 }
 304
 305
 306
 307
 308 /*
 309  * Detach an OpenID from the currently logged in account
 310  */
 311 void cmd_oidd(char *argbuf) {
 312         struct cdbdata *cdboi;
 313         char id_to_detach[1024];
 314         int this_is_mine = 0;
 315
 316         if (CtdlAccessCheck(ac_logged_in)) return;
 317         extract_token(id_to_detach, argbuf, 0, '|', sizeof id_to_detach);
 318         if (IsEmptyStr(id_to_detach)) {
 319                 cprintf("%d An empty OpenID URL is not allowed.\n", ERROR + ILLEGAL_VALUE);
 320         }
 321
 322         cdb_rewind(CDB_OPENID);
 323         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 324                 if (cdboi->len > sizeof(long)) {
 325                         if (((long)*(cdboi->ptr)) == CC->user.usernum) {
 326                                 this_is_mine = 1;
 327                         }
 328                 }
 329                 cdb_free(cdboi);
 330         }
 331
 332         if (!this_is_mine) {
 333                 cprintf("%d That OpenID was not found or not associated with your account.\n",
 334                         ERROR + ILLEGAL_VALUE);
 335                 return;
 336         }
 337
 338         cdb_delete(CDB_OPENID, id_to_detach, strlen(id_to_detach));
 339         cprintf("%d %s detached from your account.\n", CIT_OK, id_to_detach);
 340 }
 341
 342
 343
 344 /*
 345  * Attempt to auto-create a new Citadel account using the nickname from Simple Registration Extension
 346  */
 347 int openid_create_user_via_sreg(char *claimed_id, HashList *sreg_keys)
 348 {
 349         char *desired_name = NULL;
 350         char new_password[32];
 351
 352         if (config.c_auth_mode != AUTHMODE_NATIVE) return(1);
 353         if (config.c_disable_newu) return(2);
 354         if (CC->logged_in) return(3);
 355         if (!GetHash(sreg_keys, "sreg.nickname", 13, (void *) &desired_name)) return(4);
 356
 357         CtdlLogPrintf(CTDL_DEBUG, "The desired account name is <%s>\n", desired_name);
 358
 359         if (!getuser(&CC->user, desired_name)) {
 360                 CtdlLogPrintf(CTDL_DEBUG, "<%s> is already taken by another user.\n", desired_name);
 361                 memset(&CC->user, 0, sizeof(struct ctdluser));
 362                 return(5);
 363         }
 364
 365         /* The desired account name is available.  Create the account and log it in! */
 366         if (create_user(desired_name, 1)) return(6);
 367
 368         snprintf(new_password, sizeof new_password, "%08lx%08lx", random(), random());
 369         CtdlSetPassword(new_password);
 370         attach_openid(&CC->user, claimed_id);
 371         populate_vcard_from_sreg(sreg_keys);
 372         return(0);
 373 }
 374
 375
 376 /*
 377  * If a user account exists which is associated with the Claimed ID, log it in and return zero.
 378  * Otherwise it returns nonzero.
 379  */
 380 int login_via_openid(char *claimed_id)
 381 {
 382         struct cdbdata *cdboi;
 383         long usernum = 0;
 384
 385         cdboi = cdb_fetch(CDB_OPENID, claimed_id, strlen(claimed_id));
 386         if (cdboi == NULL) {
 387                 return(-1);
 388         }
 389
 390         memcpy(&usernum, cdboi->ptr, sizeof(long));
 391         cdb_free(cdboi);
 392
 393         if (!getuserbynumber(&CC->user, usernum)) {
 394                 /* Now become the user we just created */
 395                 safestrncpy(CC->curr_user, CC->user.fullname, sizeof CC->curr_user);
 396                 do_login();
 397                 return(0);
 398         }
 399         else {
 400                 memset(&CC->user, 0, sizeof(struct ctdluser));
 401                 return(-1);
 402         }
 403 }
 404
 405
 406
 407
 408 /**************************************************************************/
 409 /*                                                                        */
 410 /* Functions in this section handle OpenID protocol                       */
 411 /*                                                                        */
 412 /**************************************************************************/
 413
 414
 415 /*
 416  * Locate a <link> tag and, given its 'rel=' parameter, return its 'href' parameter
 417  */
 418 void extract_link(char *target_buf, int target_size, char *rel, char *source_buf)
 419 {
 420         char *ptr = source_buf;
 421
 422         if (!target_buf) return;
 423         if (!rel) return;
 424         if (!source_buf) return;
 425
 426         target_buf[0] = 0;
 427
 428         while (ptr = bmstrcasestr(ptr, "<link"), ptr != NULL) {
 429
 430                 char work_buffer[2048];
 431                 char *link_tag_start = NULL;
 432                 char *link_tag_end = NULL;
 433
 434                 char rel_tag[2048];
 435                 char href_tag[2048];
 436
 437                 link_tag_start = ptr;
 438                 link_tag_end = strchr(ptr, '>');
 439                 rel_tag[0] = 0;
 440                 href_tag[0] = 0;
 441
 442                 if ((link_tag_end) && (link_tag_end > link_tag_start)) {
 443                         int len;
 444                         len = link_tag_end - link_tag_start;
 445                         if (len > sizeof work_buffer) len = sizeof work_buffer;
 446                         memcpy(work_buffer, link_tag_start, len);
 447
 448                         char *rel_start = NULL;
 449                         char *rel_end = NULL;
 450                         rel_start = bmstrcasestr(work_buffer, "rel=");
 451                         if (rel_start) {
 452                                 rel_start = strchr(rel_start, '\"');
 453                                 if (rel_start) {
 454                                         ++rel_start;
 455                                         rel_end = strchr(rel_start, '\"');
 456                                         if ((rel_end) && (rel_end > rel_start)) {
 457                                                 safestrncpy(rel_tag, rel_start, rel_end - rel_start + 1);
 458                                         }
 459                                 }
 460                         }
 461
 462                         char *href_start = NULL;
 463                         char *href_end = NULL;
 464                         href_start = bmstrcasestr(work_buffer, "href=");
 465                         if (href_start) {
 466                                 href_start = strchr(href_start, '\"');
 467                                 if (href_start) {
 468                                         ++href_start;
 469                                         href_end = strchr(href_start, '\"');
 470                                         if ((href_end) && (href_end > href_start)) {
 471                                                 safestrncpy(href_tag, href_start, href_end - href_start + 1);
 472                                         }
 473                                 }
 474                         }
 475
 476                         if (!strcasecmp(rel, rel_tag)) {
 477                                 safestrncpy(target_buf, href_tag, target_size);
 478                                 return;
 479                         }
 480
 481                 }
 482
 483         ++ptr;
 484         }
 485
 486
 487 }
 488
 489
 490
 491 struct fh_data {
 492         char *buf;
 493         int total_bytes_received;
 494         int maxbytes;
 495 };
 496
 497
 498 size_t fh_callback(void *ptr, size_t size, size_t nmemb, void *stream)
 499 {
 500         struct fh_data *fh = (struct fh_data *) stream;
 501         int got_bytes = (size * nmemb);
 502
 503         if (fh->total_bytes_received + got_bytes > fh->maxbytes) {
 504                 got_bytes = fh->maxbytes - fh->total_bytes_received;
 505         }
 506         if (got_bytes > 0) {
 507                 memcpy(&fh->buf[fh->total_bytes_received], ptr, got_bytes);
 508                 fh->total_bytes_received += got_bytes;
 509         }
 510
 511         return (size * nmemb);  /* always succeed; libcurl doesn't need to know if we truncated it */
 512 }
 513
 514
 515
 516 /*
 517  * Begin an HTTP fetch (returns number of bytes actually fetched, or -1 for error) using libcurl.
 518  *
 519  * If 'normalize_len' is nonzero, the caller is specifying the buffer size of 'url', and is
 520  * requesting that the effective (normalized) URL be copied back to it.
 521  */
 522 int fetch_http(char *url, char *target_buf, int maxbytes, int normalize_len)
 523 {
 524         CURL *curl;
 525         CURLcode res;
 526         char errmsg[1024] = "";
 527         struct fh_data fh = {
 528                 target_buf,
 529                 0,
 530                 maxbytes
 531         };
 532         char *effective_url = NULL;
 533
 534         if (!url) return(-1);
 535         if (!target_buf) return(-1);
 536         memset(target_buf, 0, maxbytes);
 537
 538         curl = curl_easy_init();
 539         if (!curl) {
 540                 CtdlLogPrintf(CTDL_ALERT, "Unable to initialize libcurl.\n");
 541                 return(-1);
 542         }
 543
 544         curl_easy_setopt(curl, CURLOPT_URL, url);
 545         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 546         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 547         curl_easy_setopt(curl, CURLOPT_WRITEDATA, &fh);
 548         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fh_callback);
 549         curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
 550         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 551         curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
 552         if (!IsEmptyStr(config.c_ip_addr)) {
 553                 curl_easy_setopt(curl, CURLOPT_INTERFACE, config.c_ip_addr);
 554         }
 555         res = curl_easy_perform(curl);
 556         if (res) {
 557                 CtdlLogPrintf(CTDL_DEBUG, "fetch_http() libcurl error %d: %s\n", res, errmsg);
 558         }
 559         if (normalize_len > 0) {
 560                 curl_easy_getinfo(curl, CURLINFO_EFFECTIVE_URL, &effective_url);
 561                 safestrncpy(url, effective_url, normalize_len);
 562         }
 563         curl_easy_cleanup(curl);
 564         return fh.total_bytes_received;
 565 }
 566
 567
 568 /*
 569  * Setup an OpenID authentication
 570  */
 571 void cmd_oids(char *argbuf) {
 572         char return_to[1024];
 573         char trust_root[1024];
 574         int i;
 575         char buf[SIZ];
 576         struct CitContext *CCC = CC;    /* CachedCitContext - performance boost */
 577         struct ctdl_openid *oiddata;
 578
 579         oiddata = (struct ctdl_openid *) CCC->openid_data;
 580
 581         if (oiddata != NULL) {
 582                 if (oiddata->sreg_keys != NULL) {
 583                         DeleteHash(&oiddata->sreg_keys);
 584                         oiddata->sreg_keys = NULL;
 585                 }
 586                 free(CCC->openid_data);
 587         }
 588         oiddata = malloc(sizeof(struct ctdl_openid));
 589         if (oiddata == NULL) {
 590                 cprintf("%d malloc failed\n", ERROR + INTERNAL_ERROR);
 591                 return;
 592         }
 593         memset(oiddata, 0, sizeof(struct ctdl_openid));
 594         CCC->openid_data = (void *) oiddata;
 595
 596         extract_token(oiddata->claimed_id, argbuf, 0, '|', sizeof oiddata->claimed_id);
 597         extract_token(return_to, argbuf, 1, '|', sizeof return_to);
 598         extract_token(trust_root, argbuf, 2, '|', sizeof trust_root);
 599         oiddata->verified = 0;
 600
 601         i = fetch_http(oiddata->claimed_id, buf, sizeof buf - 1, sizeof oiddata->claimed_id);
 602         CtdlLogPrintf(CTDL_DEBUG, "Normalized URL and Claimed ID is: %s\n", oiddata->claimed_id);
 603         buf[sizeof buf - 1] = 0;
 604         if (i > 0) {
 605                 char openid_delegate[1024];
 606
 607                 extract_link(oiddata->server, sizeof oiddata->server, "openid.server", buf);
 608                 extract_link(openid_delegate, sizeof openid_delegate, "openid.delegate", buf);
 609
 610                 if (IsEmptyStr(oiddata->server)) {
 611                         cprintf("%d There is no OpenID identity provider at this URL.\n", ERROR);
 612                         return;
 613                 }
 614
 615                 /* Empty delegate is legal; we just use the openid_url instead */
 616                 if (IsEmptyStr(openid_delegate)) {
 617                         safestrncpy(openid_delegate, oiddata->claimed_id, sizeof openid_delegate);
 618                 }
 619
 620                 /* Assemble a URL to which the user-agent will be redirected. */
 621                 char redirect_string[4096];
 622                 char escaped_identity[512];
 623                 char escaped_return_to[2048];
 624                 char escaped_trust_root[1024];
 625                 char escaped_sreg_optional[256];
 626
 627                 urlesc(escaped_identity, sizeof escaped_identity, openid_delegate);
 628                 urlesc(escaped_return_to, sizeof escaped_return_to, return_to);
 629                 urlesc(escaped_trust_root, sizeof escaped_trust_root, trust_root);
 630                 urlesc(escaped_sreg_optional, sizeof escaped_sreg_optional,
 631                         "nickname,email,fullname,postcode,country,dob,gender");
 632
 633                 snprintf(redirect_string, sizeof redirect_string,
 634                         "%s"
 635                         "?openid.mode=checkid_setup"
 636                         "&openid.identity=%s"
 637                         "&openid.return_to=%s"
 638                         "&openid.trust_root=%s"
 639                         "&openid.sreg.optional=%s"
 640                         ,
 641                         oiddata->server,
 642                         escaped_identity,
 643                         escaped_return_to,
 644                         escaped_trust_root,
 645                         escaped_sreg_optional
 646                 );
 647                 cprintf("%d %s\n", CIT_OK, redirect_string);
 648                 return;
 649         }
 650
 651         cprintf("%d Unable to fetch OpenID URL\n", ERROR);
 652 }
 653
 654
 655
 656
 657
 658 /*
 659  * Finalize an OpenID authentication
 660  */
 661 void cmd_oidf(char *argbuf) {
 662         char buf[2048];
 663         char thiskey[1024];
 664         char thisdata[1024];
 665         HashList *keys = NULL;
 666         struct ctdl_openid *oiddata = (struct ctdl_openid *) CC->openid_data;
 667
 668         keys = NewHash(1, NULL);
 669         if (!keys) {
 670                 cprintf("%d NewHash() failed\n", ERROR + INTERNAL_ERROR);
 671                 return;
 672         }
 673
 674         cprintf("%d Transmit OpenID data now\n", START_CHAT_MODE);
 675
 676         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 677                 extract_token(thiskey, buf, 0, '|', sizeof thiskey);
 678                 extract_token(thisdata, buf, 1, '|', sizeof thisdata);
 679                 CtdlLogPrintf(CTDL_DEBUG, "%s: [%d] %s\n", thiskey, strlen(thisdata), thisdata);
 680                 Put(keys, thiskey, strlen(thiskey), strdup(thisdata), generic_free_handler);
 681         }
 682
 683
 684         /* Now that we have all of the parameters, we have to validate the signature against the server */
 685         CtdlLogPrintf(CTDL_DEBUG, "About to validate the signature...\n");
 686
 687         CURL *curl;
 688         CURLcode res;
 689         struct curl_httppost *formpost = NULL;
 690         struct curl_httppost *lastptr = NULL;
 691         char errmsg[1024] = "";
 692         char *o_assoc_handle = NULL;
 693         char *o_sig = NULL;
 694         char *o_signed = NULL;
 695         int num_signed_values;
 696         int i;
 697         char k_keyname[128];
 698         char k_o_keyname[128];
 699         char *k_value = NULL;
 700         char valbuf[1024];
 701
 702         struct fh_data fh = {
 703                 valbuf,
 704                 0,
 705                 sizeof valbuf
 706         };
 707
 708         curl_formadd(&formpost, &lastptr,
 709                 CURLFORM_COPYNAME,      "openid.mode",
 710                 CURLFORM_COPYCONTENTS,  "check_authentication",
 711                 CURLFORM_END);
 712         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.mode", "check_authentication");
 713
 714         if (GetHash(keys, "assoc_handle", 12, (void *) &o_assoc_handle)) {
 715                 curl_formadd(&formpost, &lastptr,
 716                         CURLFORM_COPYNAME,      "openid.assoc_handle",
 717                         CURLFORM_COPYCONTENTS,  o_assoc_handle,
 718                         CURLFORM_END);
 719                 CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.assoc_handle", o_assoc_handle);
 720         }
 721
 722         if (GetHash(keys, "sig", 3, (void *) &o_sig)) {
 723                 curl_formadd(&formpost, &lastptr,
 724                         CURLFORM_COPYNAME,      "openid.sig",
 725                         CURLFORM_COPYCONTENTS,  o_sig,
 726                         CURLFORM_END);
 727                         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.sig", o_sig);
 728         }
 729
 730         if (GetHash(keys, "signed", 6, (void *) &o_signed)) {
 731                 curl_formadd(&formpost, &lastptr,
 732                         CURLFORM_COPYNAME,      "openid.signed",
 733                         CURLFORM_COPYCONTENTS,  o_signed,
 734                         CURLFORM_END);
 735                 CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.signed", o_signed);
 736
 737                 num_signed_values = num_tokens(o_signed, ',');
 738                 for (i=0; i<num_signed_values; ++i) {
 739                         extract_token(k_keyname, o_signed, i, ',', sizeof k_keyname);
 740                         if (strcasecmp(k_keyname, "mode")) {    // work around phpMyID bug
 741                                 if (GetHash(keys, k_keyname, strlen(k_keyname), (void *) &k_value)) {
 742                                         snprintf(k_o_keyname, sizeof k_o_keyname, "openid.%s", k_keyname);
 743                                         curl_formadd(&formpost, &lastptr,
 744                                                 CURLFORM_COPYNAME,      k_o_keyname,
 745                                                 CURLFORM_COPYCONTENTS,  k_value,
 746                                                 CURLFORM_END);
 747                                         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", k_o_keyname, k_value);
 748                                 }
 749                                 else {
 750                                         CtdlLogPrintf(CTDL_INFO, "OpenID: signed field '%s' is missing\n",
 751                                                 k_keyname);
 752                                 }
 753                         }
 754                 }
 755         }
 756
 757         curl = curl_easy_init();
 758         curl_easy_setopt(curl, CURLOPT_URL, oiddata->server);
 759         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 760         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 761         curl_easy_setopt(curl, CURLOPT_WRITEDATA, &fh);
 762         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fh_callback);
 763         curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 764         curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
 765         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 766         curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
 767         if (!IsEmptyStr(config.c_ip_addr)) {
 768                 curl_easy_setopt(curl, CURLOPT_INTERFACE, config.c_ip_addr);
 769         }
 770
 771         res = curl_easy_perform(curl);
 772         if (res) {
 773                 CtdlLogPrintf(CTDL_DEBUG, "cmd_oidf() libcurl error %d: %s\n", res, errmsg);
 774         }
 775         curl_easy_cleanup(curl);
 776         curl_formfree(formpost);
 777
 778         valbuf[fh.total_bytes_received] = 0;
 779
 780         if (bmstrcasestr(valbuf, "is_valid:true")) {
 781                 oiddata->verified = 1;
 782         }
 783
 784         CtdlLogPrintf(CTDL_DEBUG, "Authentication %s.\n", (oiddata->verified ? "succeeded" : "failed") );
 785
 786         /* Respond to the client */
 787
 788         if (oiddata->verified) {
 789
 790                 /* If we were already logged in, attach the OpenID to the user's account */
 791                 if (CC->logged_in) {
 792                         if (attach_openid(&CC->user, oiddata->claimed_id) == 0) {
 793                                 cprintf("attach\n");
 794                         }
 795                         else {
 796                                 cprintf("fail\n");
 797                         }
 798                 }
 799
 800                 /* Otherwise, a user is attempting to log in using the verified OpenID */
 801                 else {
 802                         /*
 803                          * Existing user who has claimed this OpenID?
 804                          *
 805                          * Note: if you think that sending the password back over the wire is insecure,
 806                          * check your assumptions.  If someone has successfully asserted an OpenID that
 807                          * is associated with the account, they already have password equivalency and can
 808                          * login, so they could just as easily change the password, etc.
 809                          */
 810                         if (login_via_openid(oiddata->claimed_id) == 0) {
 811                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
 812                                 logged_in_response();
 813                         }
 814
 815                         /*
 816                          * If this system does not allow self-service new user registration, the
 817                          * remaining modes do not apply, so fail here and now.
 818                          */
 819                         else if (config.c_disable_newu) {
 820                                 cprintf("fail\n");
 821                         }
 822
 823                         /*
 824                          * New user whose OpenID is verified and Simple Registration Extension is in use?
 825                          */
 826                         else if (openid_create_user_via_sreg(oiddata->claimed_id, keys) == 0) {
 827                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
 828                                 logged_in_response();
 829                         }
 830
 831                         /*
 832                          * OpenID is verified, but the desired username either was not specified or
 833                          * conflicts with an existing user.  Manual account creation is required.
 834                          */
 835                         else {
 836                                 char *desired_name = NULL;
 837                                 cprintf("verify_only\n");
 838                                 cprintf("%s\n", oiddata->claimed_id);
 839                                 if (GetHash(keys, "sreg.nickname", 13, (void *) &desired_name)) {
 840                                         cprintf("%s\n", desired_name);
 841                                 }
 842                                 else {
 843                                         cprintf("\n");
 844                                 }
 845                         }
 846                 }
 847         }
 848         else {
 849                 cprintf("fail\n");
 850         }
 851         cprintf("000\n");
 852
 853         if (oiddata->sreg_keys != NULL) {
 854                 DeleteHash(&oiddata->sreg_keys);
 855                 oiddata->sreg_keys = NULL;
 856         }
 857         oiddata->sreg_keys = keys;
 858 }
 859
 860
 861
 862 /**************************************************************************/
 863 /*                                                                        */
 864 /* Functions in this section handle module initialization and shutdown    */
 865 /*                                                                        */
 866 /**************************************************************************/
 867
 868
 869 /*
 870  * This cleanup function blows away the temporary memory used by this module.
 871  */
 872 void openid_cleanup_function(void) {
 873         struct ctdl_openid *oiddata = (struct ctdl_openid *) CC->openid_data;
 874
 875         if (oiddata != NULL) {
 876                 CtdlLogPrintf(CTDL_DEBUG, "Clearing OpenID session state\n");
 877                 if (oiddata->sreg_keys != NULL) {
 878                         DeleteHash(&oiddata->sreg_keys);
 879                         oiddata->sreg_keys = NULL;
 880                 }
 881                 free(oiddata);
 882         }
 883 }
 884
 885
 886 CTDL_MODULE_INIT(openid_rp)
 887 {
 888         if (!threading) {
 889                 curl_global_init(CURL_GLOBAL_ALL);
 890
 891                 /* Only enable the OpenID command set when native mode authentication is in use. */
 892                 if (config.c_auth_mode == AUTHMODE_NATIVE) {
 893                         CtdlRegisterProtoHook(cmd_oids, "OIDS", "Setup OpenID authentication");
 894                         CtdlRegisterProtoHook(cmd_oidf, "OIDF", "Finalize OpenID authentication");
 895                         CtdlRegisterProtoHook(cmd_oidl, "OIDL", "List OpenIDs associated with an account");
 896                         CtdlRegisterProtoHook(cmd_oidd, "OIDD", "Detach an OpenID from an account");
 897                         CtdlRegisterProtoHook(cmd_oidc, "OIDC", "Create new user after validating OpenID");
 898                 }
 899                 CtdlRegisterSessionHook(openid_cleanup_function, EVT_LOGOUT);
 900                 CtdlRegisterUserHook(openid_purge, EVT_PURGEUSER);
 901         }
 902
 903         /* return our Subversion id for the Log */
 904         return "$Id$";
 905 }