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 };
  43
  44
  45
  46
  47
  48 /**************************************************************************/
  49 /*                                                                        */
  50 /* Functions in this section handle Citadel internal OpenID mapping stuff */
  51 /*                                                                        */
  52 /**************************************************************************/
  53
  54
  55 /*
  56  * The structure of an openid record *key* is:
  57  *
  58  * |--------------claimed_id-------------|
  59  *     (actual length of claimed id)
  60  *
  61  *
  62  * The structure of an openid record *value* is:
  63  *
  64  * |-----user_number----|------------claimed_id---------------|
  65  *    (sizeof long)          (actual length of claimed id)
  66  *
  67  */
  68
  69
  70
  71 /*
  72  * Attach an OpenID to a Citadel account
  73  */
  74 int attach_openid(struct ctdluser *who, char *claimed_id)
  75 {
  76         struct cdbdata *cdboi;
  77         long fetched_usernum;
  78         char *data;
  79         int data_len;
  80
  81         if (!who) return(1);
  82         if (!claimed_id) return(1);
  83         if (IsEmptyStr(claimed_id)) return(1);
  84
  85         /* Check to see if this OpenID is already in the database */
  86
  87         cdboi = cdb_fetch(CDB_OPENID, claimed_id, strlen(claimed_id));
  88         if (cdboi != NULL) {
  89                 memcpy(&fetched_usernum, cdboi->ptr, sizeof(long));
  90                 cdb_free(cdboi);
  91
  92                 if (fetched_usernum == who->usernum) {
  93                         CtdlLogPrintf(CTDL_INFO, "%s already associated; no action is taken\n", claimed_id);
  94                         return(0);
  95                 }
  96                 else {
  97                         CtdlLogPrintf(CTDL_INFO, "%s already belongs to another user\n", claimed_id);
  98                         return(3);
  99                 }
 100         }
 101
 102         /* Not already in the database, so attach it now */
 103
 104         data_len = sizeof(long) + strlen(claimed_id) + 1;
 105         data = malloc(data_len);
 106
 107         memcpy(data, &who->usernum, sizeof(long));
 108         memcpy(&data[sizeof(long)], claimed_id, strlen(claimed_id) + 1);
 109
 110         cdb_store(CDB_OPENID, claimed_id, strlen(claimed_id), data, data_len);
 111         free(data);
 112
 113         CtdlLogPrintf(CTDL_INFO, "%s has been attached to %s (%ld)\n",
 114                 claimed_id, who->fullname, who->usernum);
 115         return(0);
 116 }
 117
 118
 119
 120 /*
 121  * When a user is being deleted, we have to delete any OpenID associations
 122  */
 123 void openid_purge(struct ctdluser *usbuf) {
 124         struct cdbdata *cdboi;
 125         HashList *keys = NULL;
 126         HashPos *HashPos;
 127         char *deleteme = NULL;
 128         long len;
 129         void *Value;
 130         char *Key;
 131
 132         keys = NewHash(1, NULL);
 133         if (!keys) return;
 134
 135
 136         cdb_rewind(CDB_OPENID);
 137         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 138                 if (cdboi->len > sizeof(long)) {
 139                         if (((long)*(cdboi->ptr)) == usbuf->usernum) {
 140                                 deleteme = strdup(cdboi->ptr + sizeof(long)),
 141                                 Put(keys, deleteme, strlen(deleteme), deleteme, generic_free_handler);
 142                         }
 143                 }
 144                 cdb_free(cdboi);
 145         }
 146
 147         /* Go through the hash list, deleting keys we stored in it */
 148
 149         HashPos = GetNewHashPos();
 150         while (GetNextHashPos(keys, HashPos, &len, &Key, &Value)!=0)
 151         {
 152                 CtdlLogPrintf(CTDL_DEBUG, "Deleting associated OpenID <%s>\n", Value);
 153                 cdb_delete(CDB_OPENID, Value, strlen(Value));
 154                 /* note: don't free(Value) -- deleting the hash list will handle this for us */
 155         }
 156         DeleteHashPos(&HashPos);
 157         DeleteHash(&keys);
 158 }
 159
 160
 161
 162 /*
 163  * List the OpenIDs associated with the currently logged in account
 164  */
 165 void cmd_oidl(char *argbuf) {
 166         struct cdbdata *cdboi;
 167
 168         if (CtdlAccessCheck(ac_logged_in)) return;
 169         cdb_rewind(CDB_OPENID);
 170         cprintf("%d Associated OpenIDs:\n", LISTING_FOLLOWS);
 171
 172         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 173                 if (cdboi->len > sizeof(long)) {
 174                         if (((long)*(cdboi->ptr)) == CC->user.usernum) {
 175                                 cprintf("%s\n", cdboi->ptr + sizeof(long));
 176                         }
 177                 }
 178                 cdb_free(cdboi);
 179         }
 180         cprintf("000\n");
 181 }
 182
 183
 184 /*
 185  * Create a new user account, manually specifying the name, after successfully
 186  * verifying an OpenID (which will of course be attached to the account)
 187  */
 188 void cmd_oidc(char *argbuf) {
 189         struct ctdl_openid *oiddata = (struct ctdl_openid *) CC->openid_data;
 190
 191         if (!oiddata->verified) {
 192                 cprintf("%d You have not verified an OpenID yet.\n", ERROR);
 193                 return;
 194         }
 195
 196         /* We can make the semantics of OIDC exactly the same as NEWU, simply
 197          * by _calling_ cmd_newu() and letting it run.  Very clever!
 198          */
 199         cmd_newu(argbuf);
 200
 201         /* Now, if this logged us in, we have to attach the OpenID */
 202         if (CC->logged_in) {
 203                 attach_openid(&CC->user, oiddata->claimed_id);
 204         }
 205 }
 206
 207
 208
 209
 210 /*
 211  * Detach an OpenID from the currently logged in account
 212  */
 213 void cmd_oidd(char *argbuf) {
 214         struct cdbdata *cdboi;
 215         char id_to_detach[1024];
 216         int this_is_mine = 0;
 217
 218         if (CtdlAccessCheck(ac_logged_in)) return;
 219         extract_token(id_to_detach, argbuf, 0, '|', sizeof id_to_detach);
 220         if (IsEmptyStr(id_to_detach)) {
 221                 cprintf("%d An empty OpenID URL is not allowed.\n", ERROR + ILLEGAL_VALUE);
 222         }
 223
 224         cdb_rewind(CDB_OPENID);
 225         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 226                 if (cdboi->len > sizeof(long)) {
 227                         if (((long)*(cdboi->ptr)) == CC->user.usernum) {
 228                                 this_is_mine = 1;
 229                         }
 230                 }
 231                 cdb_free(cdboi);
 232         }
 233
 234         if (!this_is_mine) {
 235                 cprintf("%d That OpenID was not found or not associated with your account.\n",
 236                         ERROR + ILLEGAL_VALUE);
 237                 return;
 238         }
 239
 240         cdb_delete(CDB_OPENID, id_to_detach, strlen(id_to_detach));
 241         cprintf("%d %s detached from your account.\n", CIT_OK, id_to_detach);
 242 }
 243
 244
 245
 246 /*
 247  * Attempt to auto-create a new Citadel account using the nickname from Simple Registration Extension
 248  */
 249 int openid_create_user_via_sri(char *claimed_id, HashList *sri_keys)
 250 {
 251         char *desired_name = NULL;
 252         char new_password[32];
 253
 254         if (config.c_auth_mode != AUTHMODE_NATIVE) return(1);
 255         if (config.c_disable_newu) return(2);
 256         if (CC->logged_in) return(3);
 257         if (!GetHash(sri_keys, "sreg.nickname", 13, (void *) &desired_name)) return(4);
 258
 259         CtdlLogPrintf(CTDL_DEBUG, "The desired account name is <%s>\n", desired_name);
 260
 261         if (!getuser(&CC->user, desired_name)) {
 262                 CtdlLogPrintf(CTDL_DEBUG, "<%s> is already taken by another user.\n", desired_name);
 263                 memset(&CC->user, 0, sizeof(struct ctdluser));
 264                 return(5);
 265         }
 266
 267         /* The desired account name is available.  Create the account and log it in! */
 268         if (create_user(desired_name, 1)) return(6);
 269
 270         snprintf(new_password, sizeof new_password, "%08lx%08lx", random(), random());
 271         CtdlSetPassword(new_password);
 272         attach_openid(&CC->user, claimed_id);
 273         return(0);
 274 }
 275
 276 // FIXME we still have to set up the vCard
 277
 278 // identity = [50]  http://uncensored.citadel.org/~ajc/MyID.config.php
 279 // sreg.nickname = [17]  IGnatius T Foobar
 280 // sreg.email = [26]  ajc@uncensored.citadel.org
 281 // sreg.fullname = [10]  Art Cancro
 282 // sreg.postcode = [5]  10549
 283 // sreg.country = [2]  US
 284
 285
 286
 287 /*
 288  * If a user account exists which is associated with the Claimed ID, log it in and return zero.
 289  * Otherwise it returns nonzero.
 290  */
 291 int login_via_openid(char *claimed_id)
 292 {
 293         struct cdbdata *cdboi;
 294         long usernum = 0;
 295
 296         cdboi = cdb_fetch(CDB_OPENID, claimed_id, strlen(claimed_id));
 297         if (cdboi == NULL) {
 298                 return(-1);
 299         }
 300
 301         memcpy(&usernum, cdboi->ptr, sizeof(long));
 302         cdb_free(cdboi);
 303
 304         if (!getuserbynumber(&CC->user, usernum)) {
 305                 /* Now become the user we just created */
 306                 safestrncpy(CC->curr_user, CC->user.fullname, sizeof CC->curr_user);
 307                 do_login();
 308                 return(0);
 309         }
 310         else {
 311                 memset(&CC->user, 0, sizeof(struct ctdluser));
 312                 return(-1);
 313         }
 314 }
 315
 316
 317
 318
 319 /**************************************************************************/
 320 /*                                                                        */
 321 /* Functions in this section handle OpenID protocol                       */
 322 /*                                                                        */
 323 /**************************************************************************/
 324
 325
 326 /*
 327  * Locate a <link> tag and, given its 'rel=' parameter, return its 'href' parameter
 328  */
 329 void extract_link(char *target_buf, int target_size, char *rel, char *source_buf)
 330 {
 331         char *ptr = source_buf;
 332
 333         if (!target_buf) return;
 334         if (!rel) return;
 335         if (!source_buf) return;
 336
 337         target_buf[0] = 0;
 338
 339         while (ptr = bmstrcasestr(ptr, "<link"), ptr != NULL) {
 340
 341                 char work_buffer[2048];
 342                 char *link_tag_start = NULL;
 343                 char *link_tag_end = NULL;
 344
 345                 char rel_tag[2048];
 346                 char href_tag[2048];
 347
 348                 link_tag_start = ptr;
 349                 link_tag_end = strchr(ptr, '>');
 350                 rel_tag[0] = 0;
 351                 href_tag[0] = 0;
 352
 353                 if ((link_tag_end) && (link_tag_end > link_tag_start)) {
 354                         int len;
 355                         len = link_tag_end - link_tag_start;
 356                         if (len > sizeof work_buffer) len = sizeof work_buffer;
 357                         memcpy(work_buffer, link_tag_start, len);
 358
 359                         char *rel_start = NULL;
 360                         char *rel_end = NULL;
 361                         rel_start = bmstrcasestr(work_buffer, "rel=");
 362                         if (rel_start) {
 363                                 rel_start = strchr(rel_start, '\"');
 364                                 if (rel_start) {
 365                                         ++rel_start;
 366                                         rel_end = strchr(rel_start, '\"');
 367                                         if ((rel_end) && (rel_end > rel_start)) {
 368                                                 safestrncpy(rel_tag, rel_start, rel_end - rel_start + 1);
 369                                         }
 370                                 }
 371                         }
 372
 373                         char *href_start = NULL;
 374                         char *href_end = NULL;
 375                         href_start = bmstrcasestr(work_buffer, "href=");
 376                         if (href_start) {
 377                                 href_start = strchr(href_start, '\"');
 378                                 if (href_start) {
 379                                         ++href_start;
 380                                         href_end = strchr(href_start, '\"');
 381                                         if ((href_end) && (href_end > href_start)) {
 382                                                 safestrncpy(href_tag, href_start, href_end - href_start + 1);
 383                                         }
 384                                 }
 385                         }
 386
 387                         if (!strcasecmp(rel, rel_tag)) {
 388                                 safestrncpy(target_buf, href_tag, target_size);
 389                                 return;
 390                         }
 391
 392                 }
 393
 394         ++ptr;
 395         }
 396
 397
 398 }
 399
 400
 401
 402 struct fh_data {
 403         char *buf;
 404         int total_bytes_received;
 405         int maxbytes;
 406 };
 407
 408
 409 size_t fh_callback(void *ptr, size_t size, size_t nmemb, void *stream)
 410 {
 411         struct fh_data *fh = (struct fh_data *) stream;
 412         int got_bytes = (size * nmemb);
 413
 414         if (fh->total_bytes_received + got_bytes > fh->maxbytes) {
 415                 got_bytes = fh->maxbytes - fh->total_bytes_received;
 416         }
 417         if (got_bytes > 0) {
 418                 memcpy(&fh->buf[fh->total_bytes_received], ptr, got_bytes);
 419                 fh->total_bytes_received += got_bytes;
 420         }
 421
 422         return (size * nmemb);  /* always succeed; libcurl doesn't need to know if we truncated it */
 423 }
 424
 425
 426
 427 /*
 428  * Begin an HTTP fetch (returns number of bytes actually fetched, or -1 for error) using libcurl.
 429  *
 430  * If 'normalize_len' is nonzero, the caller is specifying the buffer size of 'url', and is
 431  * requesting that the effective (normalized) URL be copied back to it.
 432  */
 433 int fetch_http(char *url, char *target_buf, int maxbytes, int normalize_len)
 434 {
 435         CURL *curl;
 436         CURLcode res;
 437         char errmsg[1024] = "";
 438         struct fh_data fh = {
 439                 target_buf,
 440                 0,
 441                 maxbytes
 442         };
 443         char *effective_url = NULL;
 444
 445         if (!url) return(-1);
 446         if (!target_buf) return(-1);
 447         memset(target_buf, 0, maxbytes);
 448
 449         curl = curl_easy_init();
 450         if (!curl) {
 451                 CtdlLogPrintf(CTDL_ALERT, "Unable to initialize libcurl.\n");
 452                 return(-1);
 453         }
 454
 455         curl_easy_setopt(curl, CURLOPT_URL, url);
 456         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 457         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 458         curl_easy_setopt(curl, CURLOPT_WRITEDATA, &fh);
 459         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fh_callback);
 460         curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
 461         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 462         curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
 463         if (!IsEmptyStr(config.c_ip_addr)) {
 464                 curl_easy_setopt(curl, CURLOPT_INTERFACE, config.c_ip_addr);
 465         }
 466         res = curl_easy_perform(curl);
 467         if (res) {
 468                 CtdlLogPrintf(CTDL_DEBUG, "fetch_http() libcurl error %d: %s\n", res, errmsg);
 469         }
 470         if (normalize_len > 0) {
 471                 curl_easy_getinfo(curl, CURLINFO_EFFECTIVE_URL, &effective_url);
 472                 safestrncpy(url, effective_url, normalize_len);
 473         }
 474         curl_easy_cleanup(curl);
 475         return fh.total_bytes_received;
 476 }
 477
 478
 479 /*
 480  * Setup an OpenID authentication
 481  */
 482 void cmd_oids(char *argbuf) {
 483         char return_to[1024];
 484         char trust_root[1024];
 485         int i;
 486         char buf[SIZ];
 487         struct CitContext *CCC = CC;    /* CachedCitContext - performance boost */
 488         struct ctdl_openid *oiddata;
 489
 490         /* commented out because we may be attempting to attach an OpenID to
 491          * an existing account that is logged in
 492          *
 493         if (CCC->logged_in) {
 494                 cprintf("%d Already logged in.\n", ERROR + ALREADY_LOGGED_IN);
 495                 return;
 496         }
 497          */
 498
 499         if (CCC->openid_data != NULL) {
 500                 free(CCC->openid_data);
 501         }
 502         oiddata = malloc(sizeof(struct ctdl_openid));
 503         if (oiddata == NULL) {
 504                 cprintf("%d malloc failed\n", ERROR + INTERNAL_ERROR);
 505                 return;
 506         }
 507         memset(oiddata, 0, sizeof(struct ctdl_openid));
 508         CCC->openid_data = (void *) oiddata;
 509
 510         extract_token(oiddata->claimed_id, argbuf, 0, '|', sizeof oiddata->claimed_id);
 511         extract_token(return_to, argbuf, 1, '|', sizeof return_to);
 512         extract_token(trust_root, argbuf, 2, '|', sizeof trust_root);
 513         oiddata->verified = 0;
 514
 515         i = fetch_http(oiddata->claimed_id, buf, sizeof buf - 1, sizeof oiddata->claimed_id);
 516         CtdlLogPrintf(CTDL_DEBUG, "Normalized URL and Claimed ID is: %s\n", oiddata->claimed_id);
 517         buf[sizeof buf - 1] = 0;
 518         if (i > 0) {
 519                 char openid_delegate[1024];
 520
 521                 extract_link(oiddata->server, sizeof oiddata->server, "openid.server", buf);
 522                 extract_link(openid_delegate, sizeof openid_delegate, "openid.delegate", buf);
 523
 524                 if (IsEmptyStr(oiddata->server)) {
 525                         cprintf("%d There is no OpenID identity provider at this URL.\n", ERROR);
 526                         return;
 527                 }
 528
 529                 /* Empty delegate is legal; we just use the openid_url instead */
 530                 if (IsEmptyStr(openid_delegate)) {
 531                         safestrncpy(openid_delegate, oiddata->claimed_id, sizeof openid_delegate);
 532                 }
 533
 534                 /* Assemble a URL to which the user-agent will be redirected. */
 535                 char redirect_string[4096];
 536                 char escaped_identity[512];
 537                 char escaped_return_to[2048];
 538                 char escaped_trust_root[1024];
 539                 char escaped_sreg_optional[256];
 540
 541                 urlesc(escaped_identity, sizeof escaped_identity, openid_delegate);
 542                 urlesc(escaped_return_to, sizeof escaped_return_to, return_to);
 543                 urlesc(escaped_trust_root, sizeof escaped_trust_root, trust_root);
 544                 urlesc(escaped_sreg_optional, sizeof escaped_sreg_optional,
 545                         "nickname,email,fullname,postcode,country");
 546
 547                 snprintf(redirect_string, sizeof redirect_string,
 548                         "%s"
 549                         "?openid.mode=checkid_setup"
 550                         "&openid.identity=%s"
 551                         "&openid.return_to=%s"
 552                         "&openid.trust_root=%s"
 553                         "&openid.sreg.optional=%s"
 554                         ,
 555                         oiddata->server,
 556                         escaped_identity,
 557                         escaped_return_to,
 558                         escaped_trust_root,
 559                         escaped_sreg_optional
 560                 );
 561                 cprintf("%d %s\n", CIT_OK, redirect_string);
 562                 return;
 563         }
 564
 565         cprintf("%d Unable to fetch OpenID URL\n", ERROR);
 566 }
 567
 568
 569
 570
 571
 572 /*
 573  * Finalize an OpenID authentication
 574  */
 575 void cmd_oidf(char *argbuf) {
 576         char buf[2048];
 577         char thiskey[1024];
 578         char thisdata[1024];
 579         HashList *keys = NULL;
 580         struct ctdl_openid *oiddata = (struct ctdl_openid *) CC->openid_data;
 581
 582         keys = NewHash(1, NULL);
 583         if (!keys) {
 584                 cprintf("%d NewHash() failed\n", ERROR + INTERNAL_ERROR);
 585                 return;
 586         }
 587
 588         cprintf("%d Transmit OpenID data now\n", START_CHAT_MODE);
 589
 590         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 591                 extract_token(thiskey, buf, 0, '|', sizeof thiskey);
 592                 extract_token(thisdata, buf, 1, '|', sizeof thisdata);
 593                 CtdlLogPrintf(CTDL_DEBUG, "%s: [%d] %s\n", thiskey, strlen(thisdata), thisdata);
 594                 Put(keys, thiskey, strlen(thiskey), strdup(thisdata), generic_free_handler);
 595         }
 596
 597
 598         /* Now that we have all of the parameters, we have to validate the signature against the server */
 599         CtdlLogPrintf(CTDL_DEBUG, "About to validate the signature...\n");
 600
 601         CURL *curl;
 602         CURLcode res;
 603         struct curl_httppost *formpost = NULL;
 604         struct curl_httppost *lastptr = NULL;
 605         char errmsg[1024] = "";
 606         char *o_assoc_handle = NULL;
 607         char *o_sig = NULL;
 608         char *o_signed = NULL;
 609         int num_signed_values;
 610         int i;
 611         char k_keyname[128];
 612         char k_o_keyname[128];
 613         char *k_value = NULL;
 614         char valbuf[1024];
 615
 616         struct fh_data fh = {
 617                 valbuf,
 618                 0,
 619                 sizeof valbuf
 620         };
 621
 622         curl_formadd(&formpost, &lastptr,
 623                 CURLFORM_COPYNAME,      "openid.mode",
 624                 CURLFORM_COPYCONTENTS,  "check_authentication",
 625                 CURLFORM_END);
 626         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.mode", "check_authentication");
 627
 628         if (GetHash(keys, "assoc_handle", 12, (void *) &o_assoc_handle)) {
 629                 curl_formadd(&formpost, &lastptr,
 630                         CURLFORM_COPYNAME,      "openid.assoc_handle",
 631                         CURLFORM_COPYCONTENTS,  o_assoc_handle,
 632                         CURLFORM_END);
 633                 CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.assoc_handle", o_assoc_handle);
 634         }
 635
 636         if (GetHash(keys, "sig", 3, (void *) &o_sig)) {
 637                 curl_formadd(&formpost, &lastptr,
 638                         CURLFORM_COPYNAME,      "openid.sig",
 639                         CURLFORM_COPYCONTENTS,  o_sig,
 640                         CURLFORM_END);
 641                         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.sig", o_sig);
 642         }
 643
 644         if (GetHash(keys, "signed", 6, (void *) &o_signed)) {
 645                 curl_formadd(&formpost, &lastptr,
 646                         CURLFORM_COPYNAME,      "openid.signed",
 647                         CURLFORM_COPYCONTENTS,  o_signed,
 648                         CURLFORM_END);
 649                 CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.signed", o_signed);
 650
 651                 num_signed_values = num_tokens(o_signed, ',');
 652                 for (i=0; i<num_signed_values; ++i) {
 653                         extract_token(k_keyname, o_signed, i, ',', sizeof k_keyname);
 654                         if (strcasecmp(k_keyname, "mode")) {    // work around phpMyID bug
 655                                 if (GetHash(keys, k_keyname, strlen(k_keyname), (void *) &k_value)) {
 656                                         snprintf(k_o_keyname, sizeof k_o_keyname, "openid.%s", k_keyname);
 657                                         curl_formadd(&formpost, &lastptr,
 658                                                 CURLFORM_COPYNAME,      k_o_keyname,
 659                                                 CURLFORM_COPYCONTENTS,  k_value,
 660                                                 CURLFORM_END);
 661                                         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", k_o_keyname, k_value);
 662                                 }
 663                                 else {
 664                                         CtdlLogPrintf(CTDL_INFO, "OpenID: signed field '%s' is missing\n",
 665                                                 k_keyname);
 666                                 }
 667                         }
 668                 }
 669         }
 670
 671         curl = curl_easy_init();
 672         curl_easy_setopt(curl, CURLOPT_URL, oiddata->server);
 673         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 674         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 675         curl_easy_setopt(curl, CURLOPT_WRITEDATA, &fh);
 676         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fh_callback);
 677         curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 678         curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
 679         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 680         curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
 681         if (!IsEmptyStr(config.c_ip_addr)) {
 682                 curl_easy_setopt(curl, CURLOPT_INTERFACE, config.c_ip_addr);
 683         }
 684
 685         res = curl_easy_perform(curl);
 686         if (res) {
 687                 CtdlLogPrintf(CTDL_DEBUG, "cmd_oidf() libcurl error %d: %s\n", res, errmsg);
 688         }
 689         curl_easy_cleanup(curl);
 690         curl_formfree(formpost);
 691
 692         valbuf[fh.total_bytes_received] = 0;
 693
 694         if (bmstrcasestr(valbuf, "is_valid:true")) {
 695                 oiddata->verified = 1;
 696         }
 697
 698         CtdlLogPrintf(CTDL_DEBUG, "Authentication %s.\n", (oiddata->verified ? "succeeded" : "failed") );
 699
 700         /* Respond to the client */
 701
 702         if (oiddata->verified) {
 703
 704                 /* If we were already logged in, attach the OpenID to the user's account */
 705                 if (CC->logged_in) {
 706                         if (attach_openid(&CC->user, oiddata->claimed_id) == 0) {
 707                                 cprintf("attach\n");
 708                         }
 709                         else {
 710                                 cprintf("fail\n");
 711                         }
 712                 }
 713
 714                 /* Otherwise, a user is attempting to log in using the verified OpenID */
 715                 else {
 716                         /*
 717                          * Existing user who has claimed this OpenID?
 718                          *
 719                          * Note: if you think that sending the password back over the wire is insecure,
 720                          * check your assumptions.  If someone has successfully asserted an OpenID that
 721                          * is associated with the account, they already have password equivalency and can
 722                          * login, so they could just as easily change the password, etc.
 723                          */
 724                         if (login_via_openid(oiddata->claimed_id) == 0) {
 725                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
 726                                 logged_in_response();
 727                         }
 728
 729                         /*
 730                          * New user whose OpenID is verified and Simple Registration Extension is in use?
 731                          */
 732                         else if (openid_create_user_via_sri(oiddata->claimed_id, keys) == 0) {
 733                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
 734                                 logged_in_response();
 735                         }
 736
 737                         /*
 738                          * OpenID is verified, but the desired username either was not specified or
 739                          * conflicts with an existing user.  Manual account creation is required.
 740                          */
 741                         else {
 742                                 char *desired_name = NULL;
 743                                 cprintf("verify_only\n");
 744                                 cprintf("%s\n", oiddata->claimed_id);
 745                                 if (GetHash(keys, "sreg.nickname", 13, (void *) &desired_name)) {
 746                                         cprintf("%s\n", desired_name);
 747                                 }
 748                                 else {
 749                                         cprintf("\n");
 750                                 }
 751                         }
 752                 }
 753         }
 754         else {
 755                 cprintf("fail\n");
 756         }
 757         cprintf("000\n");
 758
 759         /*
 760          * We will eventually do something with the data in the hash list.
 761          *
 762         long len;
 763         void *Value;
 764         char *Key;
 765         HashPos *HashPos;
 766         HashPos = GetNewHashPos();
 767         while (GetNextHashPos(keys, HashPos, &len, &Key, &Value)!=0)
 768         {
 769         }
 770         DeleteHashPos(&HashPos);
 771          */
 772
 773         DeleteHash(&keys);              /* This will free() all the key data for us */
 774 }
 775
 776
 777
 778 /**************************************************************************/
 779 /*                                                                        */
 780 /* Functions in this section handle module initialization and shutdown    */
 781 /*                                                                        */
 782 /**************************************************************************/
 783
 784
 785 /*
 786  * This cleanup function blows away the temporary memory used by this module.
 787  */
 788 void openid_cleanup_function(void) {
 789
 790         if (CC->openid_data != NULL) {
 791                 CtdlLogPrintf(CTDL_DEBUG, "Clearing OpenID session state\n");
 792                 free(CC->openid_data);
 793         }
 794 }
 795
 796
 797 CTDL_MODULE_INIT(openid_rp)
 798 {
 799         if (!threading)
 800         {
 801                 curl_global_init(CURL_GLOBAL_ALL);
 802                 CtdlRegisterProtoHook(cmd_oids, "OIDS", "Setup OpenID authentication");
 803                 CtdlRegisterProtoHook(cmd_oidf, "OIDF", "Finalize OpenID authentication");
 804                 CtdlRegisterProtoHook(cmd_oidl, "OIDL", "List OpenIDs associated with an account");
 805                 CtdlRegisterProtoHook(cmd_oidd, "OIDD", "Detach an OpenID from an account");
 806                 CtdlRegisterProtoHook(cmd_oidc, "OIDC", "Create a new user after validating an OpenID");
 807                 CtdlRegisterSessionHook(openid_cleanup_function, EVT_LOGOUT);
 808                 CtdlRegisterUserHook(openid_purge, EVT_PURGEUSER);
 809         }
 810
 811         /* return our Subversion id for the Log */
 812         return "$Id$";
 813 }