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(keys, 0);
 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 *ser;
 258                 ser = vcard_serialize(v);
 259                 if (ser) {
 260                         CtdlWriteObject(USERCONFIGROOM, "text/x-vcard",
 261                                 ser, strlen(ser)+1, &CC->user, 0, 0, 0
 262                         );
 263                         free(ser);
 264                 }
 265         }
 266         vcard_free(v);
 267 }
 268
 269
 270 /*
 271  * Create a new user account, manually specifying the name, after successfully
 272  * verifying an OpenID (which will of course be attached to the account)
 273  */
 274 void cmd_oidc(char *argbuf) {
 275         struct ctdl_openid *oiddata = (struct ctdl_openid *) CC->openid_data;
 276
 277         if (!oiddata->verified) {
 278                 cprintf("%d You have not verified an OpenID yet.\n", ERROR);
 279                 return;
 280         }
 281
 282         /* We can make the semantics of OIDC exactly the same as NEWU, simply
 283          * by _calling_ cmd_newu() and letting it run.  Very clever!
 284          */
 285         cmd_newu(argbuf);
 286
 287         /* Now, if this logged us in, we have to attach the OpenID */
 288         if (CC->logged_in) {
 289                 attach_openid(&CC->user, oiddata->claimed_id);
 290                 if (oiddata->sreg_keys != NULL) {
 291                         populate_vcard_from_sreg(oiddata->sreg_keys);
 292                 }
 293         }
 294
 295 }
 296
 297
 298
 299
 300 /*
 301  * Detach an OpenID from the currently logged in account
 302  */
 303 void cmd_oidd(char *argbuf) {
 304         struct cdbdata *cdboi;
 305         char id_to_detach[1024];
 306         int this_is_mine = 0;
 307
 308         if (CtdlAccessCheck(ac_logged_in)) return;
 309         extract_token(id_to_detach, argbuf, 0, '|', sizeof id_to_detach);
 310         if (IsEmptyStr(id_to_detach)) {
 311                 cprintf("%d An empty OpenID URL is not allowed.\n", ERROR + ILLEGAL_VALUE);
 312         }
 313
 314         cdb_rewind(CDB_OPENID);
 315         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 316                 if (cdboi->len > sizeof(long)) {
 317                         if (((long)*(cdboi->ptr)) == CC->user.usernum) {
 318                                 this_is_mine = 1;
 319                         }
 320                 }
 321                 cdb_free(cdboi);
 322         }
 323
 324         if (!this_is_mine) {
 325                 cprintf("%d That OpenID was not found or not associated with your account.\n",
 326                         ERROR + ILLEGAL_VALUE);
 327                 return;
 328         }
 329
 330         cdb_delete(CDB_OPENID, id_to_detach, strlen(id_to_detach));
 331         cprintf("%d %s detached from your account.\n", CIT_OK, id_to_detach);
 332 }
 333
 334
 335
 336 /*
 337  * Attempt to auto-create a new Citadel account using the nickname from Simple Registration Extension
 338  */
 339 int openid_create_user_via_sreg(char *claimed_id, HashList *sreg_keys)
 340 {
 341         char *desired_name = NULL;
 342         char new_password[32];
 343
 344         if (config.c_auth_mode != AUTHMODE_NATIVE) return(1);
 345         if (config.c_disable_newu) return(2);
 346         if (CC->logged_in) return(3);
 347         if (!GetHash(sreg_keys, "sreg.nickname", 13, (void *) &desired_name)) return(4);
 348
 349         CtdlLogPrintf(CTDL_DEBUG, "The desired account name is <%s>\n", desired_name);
 350
 351         if (!getuser(&CC->user, desired_name)) {
 352                 CtdlLogPrintf(CTDL_DEBUG, "<%s> is already taken by another user.\n", desired_name);
 353                 memset(&CC->user, 0, sizeof(struct ctdluser));
 354                 return(5);
 355         }
 356
 357         /* The desired account name is available.  Create the account and log it in! */
 358         if (create_user(desired_name, 1)) return(6);
 359
 360         snprintf(new_password, sizeof new_password, "%08lx%08lx", random(), random());
 361         CtdlSetPassword(new_password);
 362         attach_openid(&CC->user, claimed_id);
 363         populate_vcard_from_sreg(sreg_keys);
 364         return(0);
 365 }
 366
 367
 368 /*
 369  * If a user account exists which is associated with the Claimed ID, log it in and return zero.
 370  * Otherwise it returns nonzero.
 371  */
 372 int login_via_openid(char *claimed_id)
 373 {
 374         struct cdbdata *cdboi;
 375         long usernum = 0;
 376
 377         cdboi = cdb_fetch(CDB_OPENID, claimed_id, strlen(claimed_id));
 378         if (cdboi == NULL) {
 379                 return(-1);
 380         }
 381
 382         memcpy(&usernum, cdboi->ptr, sizeof(long));
 383         cdb_free(cdboi);
 384
 385         if (!getuserbynumber(&CC->user, usernum)) {
 386                 /* Now become the user we just created */
 387                 safestrncpy(CC->curr_user, CC->user.fullname, sizeof CC->curr_user);
 388                 do_login();
 389                 return(0);
 390         }
 391         else {
 392                 memset(&CC->user, 0, sizeof(struct ctdluser));
 393                 return(-1);
 394         }
 395 }
 396
 397
 398
 399
 400 /**************************************************************************/
 401 /*                                                                        */
 402 /* Functions in this section handle OpenID protocol                       */
 403 /*                                                                        */
 404 /**************************************************************************/
 405
 406
 407 /*
 408  * Locate a <link> tag and, given its 'rel=' parameter, return its 'href' parameter
 409  */
 410 void extract_link(char *target_buf, int target_size, char *rel, char *source_buf)
 411 {
 412         char *ptr = source_buf;
 413
 414         if (!target_buf) return;
 415         if (!rel) return;
 416         if (!source_buf) return;
 417
 418         target_buf[0] = 0;
 419
 420         while (ptr = bmstrcasestr(ptr, "<link"), ptr != NULL) {
 421
 422                 char work_buffer[2048];
 423                 char *link_tag_start = NULL;
 424                 char *link_tag_end = NULL;
 425
 426                 char rel_tag[2048];
 427                 char href_tag[2048];
 428
 429                 link_tag_start = ptr;
 430                 link_tag_end = strchr(ptr, '>');
 431                 rel_tag[0] = 0;
 432                 href_tag[0] = 0;
 433
 434                 if ((link_tag_end) && (link_tag_end > link_tag_start)) {
 435                         int len;
 436                         len = link_tag_end - link_tag_start;
 437                         if (len > sizeof work_buffer) len = sizeof work_buffer;
 438                         memcpy(work_buffer, link_tag_start, len);
 439
 440                         char *rel_start = NULL;
 441                         char *rel_end = NULL;
 442                         rel_start = bmstrcasestr(work_buffer, "rel=");
 443                         if (rel_start) {
 444                                 rel_start = strchr(rel_start, '\"');
 445                                 if (rel_start) {
 446                                         ++rel_start;
 447                                         rel_end = strchr(rel_start, '\"');
 448                                         if ((rel_end) && (rel_end > rel_start)) {
 449                                                 safestrncpy(rel_tag, rel_start, rel_end - rel_start + 1);
 450                                         }
 451                                 }
 452                         }
 453
 454                         char *href_start = NULL;
 455                         char *href_end = NULL;
 456                         href_start = bmstrcasestr(work_buffer, "href=");
 457                         if (href_start) {
 458                                 href_start = strchr(href_start, '\"');
 459                                 if (href_start) {
 460                                         ++href_start;
 461                                         href_end = strchr(href_start, '\"');
 462                                         if ((href_end) && (href_end > href_start)) {
 463                                                 safestrncpy(href_tag, href_start, href_end - href_start + 1);
 464                                         }
 465                                 }
 466                         }
 467
 468                         if (!strcasecmp(rel, rel_tag)) {
 469                                 safestrncpy(target_buf, href_tag, target_size);
 470                                 return;
 471                         }
 472
 473                 }
 474
 475         ++ptr;
 476         }
 477
 478
 479 }
 480
 481
 482
 483 struct fh_data {
 484         char *buf;
 485         int total_bytes_received;
 486         int maxbytes;
 487 };
 488
 489
 490 size_t fh_callback(void *ptr, size_t size, size_t nmemb, void *stream)
 491 {
 492         struct fh_data *fh = (struct fh_data *) stream;
 493         int got_bytes = (size * nmemb);
 494
 495         if (fh->total_bytes_received + got_bytes > fh->maxbytes) {
 496                 got_bytes = fh->maxbytes - fh->total_bytes_received;
 497         }
 498         if (got_bytes > 0) {
 499                 memcpy(&fh->buf[fh->total_bytes_received], ptr, got_bytes);
 500                 fh->total_bytes_received += got_bytes;
 501         }
 502
 503         return (size * nmemb);  /* always succeed; libcurl doesn't need to know if we truncated it */
 504 }
 505
 506
 507
 508 /*
 509  * Begin an HTTP fetch (returns number of bytes actually fetched, or -1 for error) using libcurl.
 510  *
 511  * If 'normalize_len' is nonzero, the caller is specifying the buffer size of 'url', and is
 512  * requesting that the effective (normalized) URL be copied back to it.
 513  */
 514 int fetch_http(char *url, char *target_buf, int maxbytes, int normalize_len)
 515 {
 516         CURL *curl;
 517         CURLcode res;
 518         char errmsg[1024] = "";
 519         struct fh_data fh = {
 520                 target_buf,
 521                 0,
 522                 maxbytes
 523         };
 524         char *effective_url = NULL;
 525
 526         if (!url) return(-1);
 527         if (!target_buf) return(-1);
 528         memset(target_buf, 0, maxbytes);
 529
 530         curl = curl_easy_init();
 531         if (!curl) {
 532                 CtdlLogPrintf(CTDL_ALERT, "Unable to initialize libcurl.\n");
 533                 return(-1);
 534         }
 535
 536         curl_easy_setopt(curl, CURLOPT_URL, url);
 537         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 538         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 539         curl_easy_setopt(curl, CURLOPT_WRITEDATA, &fh);
 540         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fh_callback);
 541         curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
 542         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 543         curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
 544         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 180);           /* die after 180 seconds */
 545         if (!IsEmptyStr(config.c_ip_addr)) {
 546                 curl_easy_setopt(curl, CURLOPT_INTERFACE, config.c_ip_addr);
 547         }
 548         res = curl_easy_perform(curl);
 549         if (res) {
 550                 CtdlLogPrintf(CTDL_DEBUG, "fetch_http() libcurl error %d: %s\n", res, errmsg);
 551         }
 552         if (normalize_len > 0) {
 553                 curl_easy_getinfo(curl, CURLINFO_EFFECTIVE_URL, &effective_url);
 554                 safestrncpy(url, effective_url, normalize_len);
 555         }
 556         curl_easy_cleanup(curl);
 557         return fh.total_bytes_received;
 558 }
 559
 560
 561 /*
 562  * Setup an OpenID authentication
 563  */
 564 void cmd_oids(char *argbuf) {
 565         char return_to[1024];
 566         char trust_root[1024];
 567         int i;
 568         char buf[SIZ];
 569         struct CitContext *CCC = CC;    /* CachedCitContext - performance boost */
 570         struct ctdl_openid *oiddata;
 571
 572         oiddata = (struct ctdl_openid *) CCC->openid_data;
 573
 574         if (oiddata != NULL) {
 575                 if (oiddata->sreg_keys != NULL) {
 576                         DeleteHash(&oiddata->sreg_keys);
 577                         oiddata->sreg_keys = NULL;
 578                 }
 579                 free(CCC->openid_data);
 580         }
 581         oiddata = malloc(sizeof(struct ctdl_openid));
 582         if (oiddata == NULL) {
 583                 cprintf("%d malloc failed\n", ERROR + INTERNAL_ERROR);
 584                 return;
 585         }
 586         memset(oiddata, 0, sizeof(struct ctdl_openid));
 587         CCC->openid_data = (void *) oiddata;
 588
 589         extract_token(oiddata->claimed_id, argbuf, 0, '|', sizeof oiddata->claimed_id);
 590         extract_token(return_to, argbuf, 1, '|', sizeof return_to);
 591         extract_token(trust_root, argbuf, 2, '|', sizeof trust_root);
 592         oiddata->verified = 0;
 593
 594         i = fetch_http(oiddata->claimed_id, buf, sizeof buf - 1, sizeof oiddata->claimed_id);
 595         CtdlLogPrintf(CTDL_DEBUG, "Normalized URL and Claimed ID is: %s\n", oiddata->claimed_id);
 596         buf[sizeof buf - 1] = 0;
 597         if (i > 0) {
 598                 char openid_delegate[1024];
 599
 600                 extract_link(oiddata->server, sizeof oiddata->server, "openid.server", buf);
 601                 extract_link(openid_delegate, sizeof openid_delegate, "openid.delegate", buf);
 602
 603                 if (IsEmptyStr(oiddata->server)) {
 604                         cprintf("%d There is no OpenID identity provider at this URL.\n", ERROR);
 605                         return;
 606                 }
 607
 608                 /* Empty delegate is legal; we just use the openid_url instead */
 609                 if (IsEmptyStr(openid_delegate)) {
 610                         safestrncpy(openid_delegate, oiddata->claimed_id, sizeof openid_delegate);
 611                 }
 612
 613                 /* Assemble a URL to which the user-agent will be redirected. */
 614                 char redirect_string[4096];
 615                 char escaped_identity[512];
 616                 char escaped_return_to[2048];
 617                 char escaped_trust_root[1024];
 618                 char escaped_sreg_optional[256];
 619
 620                 urlesc(escaped_identity, sizeof escaped_identity, openid_delegate);
 621                 urlesc(escaped_return_to, sizeof escaped_return_to, return_to);
 622                 urlesc(escaped_trust_root, sizeof escaped_trust_root, trust_root);
 623                 urlesc(escaped_sreg_optional, sizeof escaped_sreg_optional,
 624                         "nickname,email,fullname,postcode,country,dob,gender");
 625
 626                 snprintf(redirect_string, sizeof redirect_string,
 627                         "%s"
 628                         "?openid.mode=checkid_setup"
 629                         "&openid.identity=%s"
 630                         "&openid.return_to=%s"
 631                         "&openid.trust_root=%s"
 632                         "&openid.sreg.optional=%s"
 633                         ,
 634                         oiddata->server,
 635                         escaped_identity,
 636                         escaped_return_to,
 637                         escaped_trust_root,
 638                         escaped_sreg_optional
 639                 );
 640                 cprintf("%d %s\n", CIT_OK, redirect_string);
 641                 return;
 642         }
 643
 644         cprintf("%d Unable to fetch OpenID URL\n", ERROR);
 645 }
 646
 647
 648
 649
 650
 651 /*
 652  * Finalize an OpenID authentication
 653  */
 654 void cmd_oidf(char *argbuf) {
 655         char buf[2048];
 656         char thiskey[1024];
 657         char thisdata[1024];
 658         HashList *keys = NULL;
 659         struct ctdl_openid *oiddata = (struct ctdl_openid *) CC->openid_data;
 660
 661         keys = NewHash(1, NULL);
 662         if (!keys) {
 663                 cprintf("%d NewHash() failed\n", ERROR + INTERNAL_ERROR);
 664                 return;
 665         }
 666
 667         cprintf("%d Transmit OpenID data now\n", START_CHAT_MODE);
 668
 669         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 670                 extract_token(thiskey, buf, 0, '|', sizeof thiskey);
 671                 extract_token(thisdata, buf, 1, '|', sizeof thisdata);
 672                 CtdlLogPrintf(CTDL_DEBUG, "%s: [%d] %s\n", thiskey, strlen(thisdata), thisdata);
 673                 Put(keys, thiskey, strlen(thiskey), strdup(thisdata), generic_free_handler);
 674         }
 675
 676
 677         /* Now that we have all of the parameters, we have to validate the signature against the server */
 678         CtdlLogPrintf(CTDL_DEBUG, "About to validate the signature...\n");
 679
 680         CURL *curl;
 681         CURLcode res;
 682         struct curl_httppost *formpost = NULL;
 683         struct curl_httppost *lastptr = NULL;
 684         char errmsg[1024] = "";
 685         char *o_assoc_handle = NULL;
 686         char *o_sig = NULL;
 687         char *o_signed = NULL;
 688         int num_signed_values;
 689         int i;
 690         char k_keyname[128];
 691         char k_o_keyname[128];
 692         char *k_value = NULL;
 693         char valbuf[1024];
 694
 695         struct fh_data fh = {
 696                 valbuf,
 697                 0,
 698                 sizeof valbuf
 699         };
 700
 701         curl_formadd(&formpost, &lastptr,
 702                 CURLFORM_COPYNAME,      "openid.mode",
 703                 CURLFORM_COPYCONTENTS,  "check_authentication",
 704                 CURLFORM_END);
 705         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.mode", "check_authentication");
 706
 707         if (GetHash(keys, "assoc_handle", 12, (void *) &o_assoc_handle)) {
 708                 curl_formadd(&formpost, &lastptr,
 709                         CURLFORM_COPYNAME,      "openid.assoc_handle",
 710                         CURLFORM_COPYCONTENTS,  o_assoc_handle,
 711                         CURLFORM_END);
 712                 CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.assoc_handle", o_assoc_handle);
 713         }
 714
 715         if (GetHash(keys, "sig", 3, (void *) &o_sig)) {
 716                 curl_formadd(&formpost, &lastptr,
 717                         CURLFORM_COPYNAME,      "openid.sig",
 718                         CURLFORM_COPYCONTENTS,  o_sig,
 719                         CURLFORM_END);
 720                         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.sig", o_sig);
 721         }
 722
 723         if (GetHash(keys, "signed", 6, (void *) &o_signed)) {
 724                 curl_formadd(&formpost, &lastptr,
 725                         CURLFORM_COPYNAME,      "openid.signed",
 726                         CURLFORM_COPYCONTENTS,  o_signed,
 727                         CURLFORM_END);
 728                 CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.signed", o_signed);
 729
 730                 num_signed_values = num_tokens(o_signed, ',');
 731                 for (i=0; i<num_signed_values; ++i) {
 732                         extract_token(k_keyname, o_signed, i, ',', sizeof k_keyname);
 733                         if (strcasecmp(k_keyname, "mode")) {    // work around phpMyID bug
 734                                 if (GetHash(keys, k_keyname, strlen(k_keyname), (void *) &k_value)) {
 735                                         snprintf(k_o_keyname, sizeof k_o_keyname, "openid.%s", k_keyname);
 736                                         curl_formadd(&formpost, &lastptr,
 737                                                 CURLFORM_COPYNAME,      k_o_keyname,
 738                                                 CURLFORM_COPYCONTENTS,  k_value,
 739                                                 CURLFORM_END);
 740                                         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", k_o_keyname, k_value);
 741                                 }
 742                                 else {
 743                                         CtdlLogPrintf(CTDL_INFO, "OpenID: signed field '%s' is missing\n",
 744                                                 k_keyname);
 745                                 }
 746                         }
 747                 }
 748         }
 749
 750         curl = curl_easy_init();
 751         curl_easy_setopt(curl, CURLOPT_URL, oiddata->server);
 752         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 753         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 754         curl_easy_setopt(curl, CURLOPT_WRITEDATA, &fh);
 755         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fh_callback);
 756         curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 757         curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
 758         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 759         curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
 760         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 180);           /* die after 180 seconds */
 761         if (!IsEmptyStr(config.c_ip_addr)) {
 762                 curl_easy_setopt(curl, CURLOPT_INTERFACE, config.c_ip_addr);
 763         }
 764
 765         res = curl_easy_perform(curl);
 766         if (res) {
 767                 CtdlLogPrintf(CTDL_DEBUG, "cmd_oidf() libcurl error %d: %s\n", res, errmsg);
 768         }
 769         curl_easy_cleanup(curl);
 770         curl_formfree(formpost);
 771
 772         valbuf[fh.total_bytes_received] = 0;
 773
 774         if (bmstrcasestr(valbuf, "is_valid:true")) {
 775                 oiddata->verified = 1;
 776         }
 777
 778         CtdlLogPrintf(CTDL_DEBUG, "Authentication %s.\n", (oiddata->verified ? "succeeded" : "failed") );
 779
 780         /* Respond to the client */
 781
 782         if (oiddata->verified) {
 783
 784                 /* If we were already logged in, attach the OpenID to the user's account */
 785                 if (CC->logged_in) {
 786                         if (attach_openid(&CC->user, oiddata->claimed_id) == 0) {
 787                                 cprintf("attach\n");
 788                         }
 789                         else {
 790                                 cprintf("fail\n");
 791                         }
 792                 }
 793
 794                 /* Otherwise, a user is attempting to log in using the verified OpenID */
 795                 else {
 796                         /*
 797                          * Existing user who has claimed this OpenID?
 798                          *
 799                          * Note: if you think that sending the password back over the wire is insecure,
 800                          * check your assumptions.  If someone has successfully asserted an OpenID that
 801                          * is associated with the account, they already have password equivalency and can
 802                          * login, so they could just as easily change the password, etc.
 803                          */
 804                         if (login_via_openid(oiddata->claimed_id) == 0) {
 805                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
 806                                 logged_in_response();
 807                         }
 808
 809                         /*
 810                          * If this system does not allow self-service new user registration, the
 811                          * remaining modes do not apply, so fail here and now.
 812                          */
 813                         else if (config.c_disable_newu) {
 814                                 cprintf("fail\n");
 815                         }
 816
 817                         /*
 818                          * New user whose OpenID is verified and Simple Registration Extension is in use?
 819                          */
 820                         else if (openid_create_user_via_sreg(oiddata->claimed_id, keys) == 0) {
 821                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
 822                                 logged_in_response();
 823                         }
 824
 825                         /*
 826                          * OpenID is verified, but the desired username either was not specified or
 827                          * conflicts with an existing user.  Manual account creation is required.
 828                          */
 829                         else {
 830                                 char *desired_name = NULL;
 831                                 cprintf("verify_only\n");
 832                                 cprintf("%s\n", oiddata->claimed_id);
 833                                 if (GetHash(keys, "sreg.nickname", 13, (void *) &desired_name)) {
 834                                         cprintf("%s\n", desired_name);
 835                                 }
 836                                 else {
 837                                         cprintf("\n");
 838                                 }
 839                         }
 840                 }
 841         }
 842         else {
 843                 cprintf("fail\n");
 844         }
 845         cprintf("000\n");
 846
 847         if (oiddata->sreg_keys != NULL) {
 848                 DeleteHash(&oiddata->sreg_keys);
 849                 oiddata->sreg_keys = NULL;
 850         }
 851         oiddata->sreg_keys = keys;
 852 }
 853
 854
 855
 856 /**************************************************************************/
 857 /*                                                                        */
 858 /* Functions in this section handle module initialization and shutdown    */
 859 /*                                                                        */
 860 /**************************************************************************/
 861
 862
 863 /*
 864  * This cleanup function blows away the temporary memory used by this module.
 865  */
 866 void openid_cleanup_function(void) {
 867         struct ctdl_openid *oiddata = (struct ctdl_openid *) CC->openid_data;
 868
 869         if (oiddata != NULL) {
 870                 CtdlLogPrintf(CTDL_DEBUG, "Clearing OpenID session state\n");
 871                 if (oiddata->sreg_keys != NULL) {
 872                         DeleteHash(&oiddata->sreg_keys);
 873                         oiddata->sreg_keys = NULL;
 874                 }
 875                 free(oiddata);
 876         }
 877 }
 878
 879
 880 CTDL_MODULE_INIT(openid_rp)
 881 {
 882         if (!threading) {
 883                 curl_global_init(CURL_GLOBAL_ALL);
 884
 885                 /* Only enable the OpenID command set when native mode authentication is in use. */
 886                 if (config.c_auth_mode == AUTHMODE_NATIVE) {
 887                         CtdlRegisterProtoHook(cmd_oids, "OIDS", "Setup OpenID authentication");
 888                         CtdlRegisterProtoHook(cmd_oidf, "OIDF", "Finalize OpenID authentication");
 889                         CtdlRegisterProtoHook(cmd_oidl, "OIDL", "List OpenIDs associated with an account");
 890                         CtdlRegisterProtoHook(cmd_oidd, "OIDD", "Detach an OpenID from an account");
 891                         CtdlRegisterProtoHook(cmd_oidc, "OIDC", "Create new user after validating OpenID");
 892                 }
 893                 CtdlRegisterSessionHook(openid_cleanup_function, EVT_LOGOUT);
 894                 CtdlRegisterUserHook(openid_purge, EVT_PURGEUSER);
 895         }
 896
 897         /* return our Subversion id for the Log */
 898         return "$Id$";
 899 }