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