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         const 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  * List ALL OpenIDs in the database
 190  */
 191 void cmd_oida(char *argbuf) {
 192         struct cdbdata *cdboi;
 193         long usernum;
 194         struct ctdluser usbuf;
 195
 196         if (CtdlAccessCheck(ac_aide)) return;
 197         cdb_rewind(CDB_OPENID);
 198         cprintf("%d List of all OpenIDs in the database:\n", LISTING_FOLLOWS);
 199
 200         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 201                 if (cdboi->len > sizeof(long)) {
 202                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 203                         if (getuserbynumber(&usbuf, usernum) != 0) {
 204                                 usbuf.fullname[0] = 0;
 205                         }
 206                         cprintf("%s|%ld|%s\n",
 207                                 cdboi->ptr + sizeof(long),
 208                                 usernum,
 209                                 usbuf.fullname
 210                         );
 211                 }
 212                 cdb_free(cdboi);
 213         }
 214         cprintf("000\n");
 215 }
 216
 217
 218 /*
 219  * Attempt to register (populate the vCard) the currently-logged-in user
 220  * using the data from Simple Registration Extension, if present.
 221  */
 222 void populate_vcard_from_sreg(HashList *sreg_keys) {
 223
 224         struct vCard *v;
 225         int pop = 0;                    /* number of fields populated */
 226         char *data = NULL;
 227         char *postcode = NULL;
 228         char *country = NULL;
 229
 230         if (!sreg_keys) return;
 231         v = vcard_new();
 232         if (!v) return;
 233
 234         if (GetHash(sreg_keys, "identity", 8, (void *) &data)) {
 235                 vcard_add_prop(v, "url;type=openid", data);
 236                 ++pop;
 237         }
 238
 239         if (GetHash(sreg_keys, "sreg.email", 10, (void *) &data)) {
 240                 vcard_add_prop(v, "email;internet", data);
 241                 ++pop;
 242         }
 243
 244         if (GetHash(sreg_keys, "sreg.nickname", 13, (void *) &data)) {
 245                 vcard_add_prop(v, "nickname", data);
 246                 ++pop;
 247         }
 248
 249         if (GetHash(sreg_keys, "sreg.fullname", 13, (void *) &data)) {
 250                 char n[256];
 251                 vcard_add_prop(v, "fn", data);
 252                 vcard_fn_to_n(n, data, sizeof n);
 253                 vcard_add_prop(v, "n", n);
 254                 ++pop;
 255         }
 256
 257         if (!GetHash(sreg_keys, "sreg.postcode", 13, (void *) &postcode)) {
 258                 postcode = NULL;
 259         }
 260
 261         if (!GetHash(sreg_keys, "sreg.country", 12, (void *) &country)) {
 262                 country = NULL;
 263         }
 264
 265         if (postcode || country) {
 266                 char adr[256];
 267                 snprintf(adr, sizeof adr, ";;;;;%s;%s",
 268                         (postcode ? postcode : ""),
 269                         (country ? country : "")
 270                 );
 271                 vcard_add_prop(v, "adr", adr);
 272                 ++pop;
 273         }
 274
 275         if (GetHash(sreg_keys, "sreg.dob", 8, (void *) &data)) {
 276                 vcard_add_prop(v, "bday", data);
 277                 ++pop;
 278         }
 279
 280         if (GetHash(sreg_keys, "sreg.gender", 11, (void *) &data)) {
 281                 vcard_add_prop(v, "x-funambol-gender", data);
 282                 ++pop;
 283         }
 284
 285         /* Only save the vCard if there is some useful data in it */
 286         if (pop > 0) {
 287                 char *ser;
 288                 ser = vcard_serialize(v);
 289                 if (ser) {
 290                         CtdlWriteObject(USERCONFIGROOM, "text/x-vcard",
 291                                 ser, strlen(ser)+1, &CC->user, 0, 0, 0
 292                         );
 293                         free(ser);
 294                 }
 295         }
 296         vcard_free(v);
 297 }
 298
 299
 300 /*
 301  * Create a new user account, manually specifying the name, after successfully
 302  * verifying an OpenID (which will of course be attached to the account)
 303  */
 304 void cmd_oidc(char *argbuf) {
 305         struct ctdl_openid *oiddata = (struct ctdl_openid *) CC->openid_data;
 306
 307         if (!oiddata) {
 308                 cprintf("%d You have not verified an OpenID yet.\n", ERROR);
 309                 return;
 310         }
 311
 312         if (!oiddata->verified) {
 313                 cprintf("%d You have not verified an OpenID yet.\n", ERROR);
 314                 return;
 315         }
 316
 317         /* We can make the semantics of OIDC exactly the same as NEWU, simply
 318          * by _calling_ cmd_newu() and letting it run.  Very clever!
 319          */
 320         cmd_newu(argbuf);
 321
 322         /* Now, if this logged us in, we have to attach the OpenID */
 323         if (CC->logged_in) {
 324                 attach_openid(&CC->user, oiddata->claimed_id);
 325                 if (oiddata->sreg_keys != NULL) {
 326                         populate_vcard_from_sreg(oiddata->sreg_keys);
 327                 }
 328         }
 329
 330 }
 331
 332
 333
 334
 335 /*
 336  * Detach an OpenID from the currently logged in account
 337  */
 338 void cmd_oidd(char *argbuf) {
 339         struct cdbdata *cdboi;
 340         char id_to_detach[1024];
 341         int this_is_mine = 0;
 342
 343         if (CtdlAccessCheck(ac_logged_in)) return;
 344         extract_token(id_to_detach, argbuf, 0, '|', sizeof id_to_detach);
 345         if (IsEmptyStr(id_to_detach)) {
 346                 cprintf("%d An empty OpenID URL is not allowed.\n", ERROR + ILLEGAL_VALUE);
 347         }
 348
 349         cdb_rewind(CDB_OPENID);
 350         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 351                 if (cdboi->len > sizeof(long)) {
 352                         if (((long)*(cdboi->ptr)) == CC->user.usernum) {
 353                                 this_is_mine = 1;
 354                         }
 355                 }
 356                 cdb_free(cdboi);
 357         }
 358
 359         if (!this_is_mine) {
 360                 cprintf("%d That OpenID was not found or not associated with your account.\n",
 361                         ERROR + ILLEGAL_VALUE);
 362                 return;
 363         }
 364
 365         cdb_delete(CDB_OPENID, id_to_detach, strlen(id_to_detach));
 366         cprintf("%d %s detached from your account.\n", CIT_OK, id_to_detach);
 367 }
 368
 369
 370
 371 /*
 372  * Attempt to auto-create a new Citadel account using the nickname from Simple Registration Extension
 373  */
 374 int openid_create_user_via_sreg(char *claimed_id, HashList *sreg_keys)
 375 {
 376         char *desired_name = NULL;
 377         char new_password[32];
 378
 379         if (config.c_auth_mode != AUTHMODE_NATIVE) return(1);
 380         if (config.c_disable_newu) return(2);
 381         if (CC->logged_in) return(3);
 382         if (!GetHash(sreg_keys, "sreg.nickname", 13, (void *) &desired_name)) return(4);
 383
 384         CtdlLogPrintf(CTDL_DEBUG, "The desired account name is <%s>\n", desired_name);
 385
 386         if (!getuser(&CC->user, desired_name)) {
 387                 CtdlLogPrintf(CTDL_DEBUG, "<%s> is already taken by another user.\n", desired_name);
 388                 memset(&CC->user, 0, sizeof(struct ctdluser));
 389                 return(5);
 390         }
 391
 392         /* The desired account name is available.  Create the account and log it in! */
 393         if (create_user(desired_name, 1)) return(6);
 394
 395         snprintf(new_password, sizeof new_password, "%08lx%08lx", random(), random());
 396         CtdlSetPassword(new_password);
 397         attach_openid(&CC->user, claimed_id);
 398         populate_vcard_from_sreg(sreg_keys);
 399         return(0);
 400 }
 401
 402
 403 /*
 404  * If a user account exists which is associated with the Claimed ID, log it in and return zero.
 405  * Otherwise it returns nonzero.
 406  */
 407 int login_via_openid(char *claimed_id)
 408 {
 409         struct cdbdata *cdboi;
 410         long usernum = 0;
 411
 412         cdboi = cdb_fetch(CDB_OPENID, claimed_id, strlen(claimed_id));
 413         if (cdboi == NULL) {
 414                 return(-1);
 415         }
 416
 417         memcpy(&usernum, cdboi->ptr, sizeof(long));
 418         cdb_free(cdboi);
 419
 420         if (!getuserbynumber(&CC->user, usernum)) {
 421                 /* Now become the user we just created */
 422                 safestrncpy(CC->curr_user, CC->user.fullname, sizeof CC->curr_user);
 423                 do_login();
 424                 return(0);
 425         }
 426         else {
 427                 memset(&CC->user, 0, sizeof(struct ctdluser));
 428                 return(-1);
 429         }
 430 }
 431
 432
 433
 434
 435 /**************************************************************************/
 436 /*                                                                        */
 437 /* Functions in this section handle OpenID protocol                       */
 438 /*                                                                        */
 439 /**************************************************************************/
 440
 441
 442 /*
 443  * Locate a <link> tag and, given its 'rel=' parameter, return its 'href' parameter
 444  */
 445 void extract_link(char *target_buf, int target_size, char *rel, char *source_buf)
 446 {
 447         char *ptr = source_buf;
 448
 449         if (!target_buf) return;
 450         if (!rel) return;
 451         if (!source_buf) return;
 452
 453         target_buf[0] = 0;
 454
 455         while (ptr = bmstrcasestr(ptr, "<link"), ptr != NULL) {
 456
 457                 char work_buffer[2048];
 458                 char *link_tag_start = NULL;
 459                 char *link_tag_end = NULL;
 460
 461                 char rel_tag[2048];
 462                 char href_tag[2048];
 463
 464                 link_tag_start = ptr;
 465                 link_tag_end = strchr(ptr, '>');
 466                 rel_tag[0] = 0;
 467                 href_tag[0] = 0;
 468
 469                 if ((link_tag_end) && (link_tag_end > link_tag_start)) {
 470                         int len;
 471                         len = link_tag_end - link_tag_start;
 472                         if (len > sizeof work_buffer) len = sizeof work_buffer;
 473                         memcpy(work_buffer, link_tag_start, len);
 474
 475                         char *rel_start = NULL;
 476                         char *rel_end = NULL;
 477                         rel_start = bmstrcasestr(work_buffer, "rel=");
 478                         if (rel_start) {
 479                                 rel_start = strchr(rel_start, '\"');
 480                                 if (rel_start) {
 481                                         ++rel_start;
 482                                         rel_end = strchr(rel_start, '\"');
 483                                         if ((rel_end) && (rel_end > rel_start)) {
 484                                                 safestrncpy(rel_tag, rel_start, rel_end - rel_start + 1);
 485                                         }
 486                                 }
 487                         }
 488
 489                         char *href_start = NULL;
 490                         char *href_end = NULL;
 491                         href_start = bmstrcasestr(work_buffer, "href=");
 492                         if (href_start) {
 493                                 href_start = strchr(href_start, '\"');
 494                                 if (href_start) {
 495                                         ++href_start;
 496                                         href_end = strchr(href_start, '\"');
 497                                         if ((href_end) && (href_end > href_start)) {
 498                                                 safestrncpy(href_tag, href_start, href_end - href_start + 1);
 499                                         }
 500                                 }
 501                         }
 502
 503                         if (!strcasecmp(rel, rel_tag)) {
 504                                 safestrncpy(target_buf, href_tag, target_size);
 505                                 return;
 506                         }
 507
 508                 }
 509
 510         ++ptr;
 511         }
 512
 513
 514 }
 515
 516
 517
 518 struct fh_data {
 519         char *buf;
 520         int total_bytes_received;
 521         int maxbytes;
 522 };
 523
 524
 525 size_t fh_callback(void *ptr, size_t size, size_t nmemb, void *stream)
 526 {
 527         struct fh_data *fh = (struct fh_data *) stream;
 528         int got_bytes = (size * nmemb);
 529
 530         if (fh->total_bytes_received + got_bytes > fh->maxbytes) {
 531                 got_bytes = fh->maxbytes - fh->total_bytes_received;
 532         }
 533         if (got_bytes > 0) {
 534                 memcpy(&fh->buf[fh->total_bytes_received], ptr, got_bytes);
 535                 fh->total_bytes_received += got_bytes;
 536         }
 537
 538         return (size * nmemb);  /* always succeed; libcurl doesn't need to know if we truncated it */
 539 }
 540
 541
 542
 543 /*
 544  * Begin an HTTP fetch (returns number of bytes actually fetched, or -1 for error) using libcurl.
 545  *
 546  * If 'normalize_len' is nonzero, the caller is specifying the buffer size of 'url', and is
 547  * requesting that the effective (normalized) URL be copied back to it.
 548  */
 549 int fetch_http(char *url, char *target_buf, int maxbytes, int normalize_len)
 550 {
 551         CURL *curl;
 552         CURLcode res;
 553         char errmsg[1024] = "";
 554         struct fh_data fh = {
 555                 target_buf,
 556                 0,
 557                 maxbytes
 558         };
 559         char *effective_url = NULL;
 560
 561         if (!url) return(-1);
 562         if (!target_buf) return(-1);
 563         memset(target_buf, 0, maxbytes);
 564
 565         curl = curl_easy_init();
 566         if (!curl) {
 567                 CtdlLogPrintf(CTDL_ALERT, "Unable to initialize libcurl.\n");
 568                 return(-1);
 569         }
 570
 571         curl_easy_setopt(curl, CURLOPT_URL, url);
 572         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 573         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 574         curl_easy_setopt(curl, CURLOPT_WRITEDATA, &fh);
 575         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fh_callback);
 576         curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
 577         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 578 #ifdef CURLOPT_HTTP_CONTENT_DECODING
 579         curl_easy_setopt(curl, CURLOPT_HTTP_CONTENT_DECODING, 1);
 580         curl_easy_setopt(curl, CURLOPT_ENCODING, "");
 581 #endif
 582         curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
 583         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 180);           /* die after 180 seconds */
 584         if (!IsEmptyStr(config.c_ip_addr)) {
 585                 curl_easy_setopt(curl, CURLOPT_INTERFACE, config.c_ip_addr);
 586         }
 587         res = curl_easy_perform(curl);
 588         if (res) {
 589                 CtdlLogPrintf(CTDL_DEBUG, "fetch_http() libcurl error %d: %s\n", res, errmsg);
 590         }
 591         if (normalize_len > 0) {
 592                 curl_easy_getinfo(curl, CURLINFO_EFFECTIVE_URL, &effective_url);
 593                 safestrncpy(url, effective_url, normalize_len);
 594         }
 595         curl_easy_cleanup(curl);
 596         return fh.total_bytes_received;
 597 }
 598
 599
 600 /*
 601  * Setup an OpenID authentication
 602  */
 603 void cmd_oids(char *argbuf) {
 604         char return_to[1024];
 605         char trust_root[1024];
 606         int i;
 607         char buf[SIZ];
 608         struct CitContext *CCC = CC;    /* CachedCitContext - performance boost */
 609         struct ctdl_openid *oiddata;
 610
 611         oiddata = (struct ctdl_openid *) CCC->openid_data;
 612
 613         if (oiddata != NULL) {
 614                 if (oiddata->sreg_keys != NULL) {
 615                         DeleteHash(&oiddata->sreg_keys);
 616                         oiddata->sreg_keys = NULL;
 617                 }
 618                 free(CCC->openid_data);
 619         }
 620         oiddata = malloc(sizeof(struct ctdl_openid));
 621         if (oiddata == NULL) {
 622                 cprintf("%d malloc failed\n", ERROR + INTERNAL_ERROR);
 623                 return;
 624         }
 625         memset(oiddata, 0, sizeof(struct ctdl_openid));
 626         CCC->openid_data = (void *) oiddata;
 627
 628         extract_token(oiddata->claimed_id, argbuf, 0, '|', sizeof oiddata->claimed_id);
 629         extract_token(return_to, argbuf, 1, '|', sizeof return_to);
 630         extract_token(trust_root, argbuf, 2, '|', sizeof trust_root);
 631         oiddata->verified = 0;
 632
 633         i = fetch_http(oiddata->claimed_id, buf, sizeof buf - 1, sizeof oiddata->claimed_id);
 634         CtdlLogPrintf(CTDL_DEBUG, "Normalized URL and Claimed ID is: %s\n", oiddata->claimed_id);
 635         buf[sizeof buf - 1] = 0;
 636         if (i > 0) {
 637                 char openid_delegate[1024];
 638
 639                 extract_link(oiddata->server, sizeof oiddata->server, "openid.server", buf);
 640                 extract_link(openid_delegate, sizeof openid_delegate, "openid.delegate", buf);
 641
 642                 if (IsEmptyStr(oiddata->server)) {
 643                         cprintf("%d There is no OpenID identity provider at this URL.\n", ERROR);
 644                         return;
 645                 }
 646
 647                 /* Empty delegate is legal; we just use the openid_url instead */
 648                 if (IsEmptyStr(openid_delegate)) {
 649                         safestrncpy(openid_delegate, oiddata->claimed_id, sizeof openid_delegate);
 650                 }
 651
 652                 /* Assemble a URL to which the user-agent will be redirected. */
 653                 char redirect_string[4096];
 654                 char escaped_identity[512];
 655                 char escaped_return_to[2048];
 656                 char escaped_trust_root[1024];
 657                 char escaped_sreg_optional[256];
 658
 659                 urlesc(escaped_identity, sizeof escaped_identity, openid_delegate);
 660                 urlesc(escaped_return_to, sizeof escaped_return_to, return_to);
 661                 urlesc(escaped_trust_root, sizeof escaped_trust_root, trust_root);
 662                 urlesc(escaped_sreg_optional, sizeof escaped_sreg_optional,
 663                         "nickname,email,fullname,postcode,country,dob,gender");
 664
 665                 snprintf(redirect_string, sizeof redirect_string,
 666                         "%s"
 667                         "?openid.mode=checkid_setup"
 668                         "&openid.identity=%s"
 669                         "&openid.return_to=%s"
 670                         "&openid.trust_root=%s"
 671                         "&openid.sreg.optional=%s"
 672                         ,
 673                         oiddata->server,
 674                         escaped_identity,
 675                         escaped_return_to,
 676                         escaped_trust_root,
 677                         escaped_sreg_optional
 678                 );
 679                 cprintf("%d %s\n", CIT_OK, redirect_string);
 680                 return;
 681         }
 682
 683         cprintf("%d Unable to fetch OpenID URL\n", ERROR);
 684 }
 685
 686
 687
 688
 689
 690 /*
 691  * Finalize an OpenID authentication
 692  */
 693 void cmd_oidf(char *argbuf) {
 694         char buf[2048];
 695         char thiskey[1024];
 696         char thisdata[1024];
 697         HashList *keys = NULL;
 698         struct ctdl_openid *oiddata = (struct ctdl_openid *) CC->openid_data;
 699
 700         keys = NewHash(1, NULL);
 701         if (!keys) {
 702                 cprintf("%d NewHash() failed\n", ERROR + INTERNAL_ERROR);
 703                 return;
 704         }
 705
 706         cprintf("%d Transmit OpenID data now\n", START_CHAT_MODE);
 707
 708         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 709                 extract_token(thiskey, buf, 0, '|', sizeof thiskey);
 710                 extract_token(thisdata, buf, 1, '|', sizeof thisdata);
 711                 CtdlLogPrintf(CTDL_DEBUG, "%s: [%d] %s\n", thiskey, strlen(thisdata), thisdata);
 712                 Put(keys, thiskey, strlen(thiskey), strdup(thisdata), generic_free_handler);
 713         }
 714
 715
 716         /* Now that we have all of the parameters, we have to validate the signature against the server */
 717         CtdlLogPrintf(CTDL_DEBUG, "About to validate the signature...\n");
 718
 719         CURL *curl;
 720         CURLcode res;
 721         struct curl_httppost *formpost = NULL;
 722         struct curl_httppost *lastptr = NULL;
 723         char errmsg[1024] = "";
 724         char *o_assoc_handle = NULL;
 725         char *o_sig = NULL;
 726         char *o_signed = NULL;
 727         int num_signed_values;
 728         int i;
 729         char k_keyname[128];
 730         char k_o_keyname[128];
 731         char *k_value = NULL;
 732         char valbuf[1024];
 733
 734         struct fh_data fh = {
 735                 valbuf,
 736                 0,
 737                 sizeof valbuf
 738         };
 739
 740         curl_formadd(&formpost, &lastptr,
 741                 CURLFORM_COPYNAME,      "openid.mode",
 742                 CURLFORM_COPYCONTENTS,  "check_authentication",
 743                 CURLFORM_END);
 744         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.mode", "check_authentication");
 745
 746         if (GetHash(keys, "assoc_handle", 12, (void *) &o_assoc_handle)) {
 747                 curl_formadd(&formpost, &lastptr,
 748                         CURLFORM_COPYNAME,      "openid.assoc_handle",
 749                         CURLFORM_COPYCONTENTS,  o_assoc_handle,
 750                         CURLFORM_END);
 751                 CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.assoc_handle", o_assoc_handle);
 752         }
 753
 754         if (GetHash(keys, "sig", 3, (void *) &o_sig)) {
 755                 curl_formadd(&formpost, &lastptr,
 756                         CURLFORM_COPYNAME,      "openid.sig",
 757                         CURLFORM_COPYCONTENTS,  o_sig,
 758                         CURLFORM_END);
 759                         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.sig", o_sig);
 760         }
 761
 762         if (GetHash(keys, "signed", 6, (void *) &o_signed)) {
 763                 curl_formadd(&formpost, &lastptr,
 764                         CURLFORM_COPYNAME,      "openid.signed",
 765                         CURLFORM_COPYCONTENTS,  o_signed,
 766                         CURLFORM_END);
 767                 CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.signed", o_signed);
 768
 769                 num_signed_values = num_tokens(o_signed, ',');
 770                 for (i=0; i<num_signed_values; ++i) {
 771                         extract_token(k_keyname, o_signed, i, ',', sizeof k_keyname);
 772                         if (strcasecmp(k_keyname, "mode")) {    // work around phpMyID bug
 773                                 if (GetHash(keys, k_keyname, strlen(k_keyname), (void *) &k_value)) {
 774                                         snprintf(k_o_keyname, sizeof k_o_keyname, "openid.%s", k_keyname);
 775                                         curl_formadd(&formpost, &lastptr,
 776                                                 CURLFORM_COPYNAME,      k_o_keyname,
 777                                                 CURLFORM_COPYCONTENTS,  k_value,
 778                                                 CURLFORM_END);
 779                                         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", k_o_keyname, k_value);
 780                                 }
 781                                 else {
 782                                         CtdlLogPrintf(CTDL_INFO, "OpenID: signed field '%s' is missing\n",
 783                                                 k_keyname);
 784                                 }
 785                         }
 786                 }
 787         }
 788
 789         curl = curl_easy_init();
 790         curl_easy_setopt(curl, CURLOPT_URL, oiddata->server);
 791         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 792         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 793         curl_easy_setopt(curl, CURLOPT_WRITEDATA, &fh);
 794         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fh_callback);
 795         curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 796         curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
 797         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 798 #ifdef CURLOPT_HTTP_CONTENT_DECODING
 799         curl_easy_setopt(curl, CURLOPT_HTTP_CONTENT_DECODING, 1);
 800         curl_easy_setopt(curl, CURLOPT_ENCODING, "");
 801 #endif
 802         curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
 803         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 180);           /* die after 180 seconds */
 804         if (!IsEmptyStr(config.c_ip_addr)) {
 805                 curl_easy_setopt(curl, CURLOPT_INTERFACE, config.c_ip_addr);
 806         }
 807
 808         res = curl_easy_perform(curl);
 809         if (res) {
 810                 CtdlLogPrintf(CTDL_DEBUG, "cmd_oidf() libcurl error %d: %s\n", res, errmsg);
 811         }
 812         curl_easy_cleanup(curl);
 813         curl_formfree(formpost);
 814
 815         valbuf[fh.total_bytes_received] = 0;
 816
 817         if (bmstrcasestr(valbuf, "is_valid:true")) {
 818                 oiddata->verified = 1;
 819         }
 820
 821         CtdlLogPrintf(CTDL_DEBUG, "Authentication %s.\n", (oiddata->verified ? "succeeded" : "failed") );
 822
 823         /* Respond to the client */
 824
 825         if (oiddata->verified) {
 826
 827                 /* If we were already logged in, attach the OpenID to the user's account */
 828                 if (CC->logged_in) {
 829                         if (attach_openid(&CC->user, oiddata->claimed_id) == 0) {
 830                                 cprintf("attach\n");
 831                                 CtdlLogPrintf(CTDL_DEBUG, "OpenID attach succeeded\n");
 832                         }
 833                         else {
 834                                 cprintf("fail\n");
 835                                 CtdlLogPrintf(CTDL_DEBUG, "OpenID attach failed\n");
 836                         }
 837                 }
 838
 839                 /* Otherwise, a user is attempting to log in using the verified OpenID */
 840                 else {
 841                         /*
 842                          * Existing user who has claimed this OpenID?
 843                          *
 844                          * Note: if you think that sending the password back over the wire is insecure,
 845                          * check your assumptions.  If someone has successfully asserted an OpenID that
 846                          * is associated with the account, they already have password equivalency and can
 847                          * login, so they could just as easily change the password, etc.
 848                          */
 849                         if (login_via_openid(oiddata->claimed_id) == 0) {
 850                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
 851                                 logged_in_response();
 852                                 CtdlLogPrintf(CTDL_DEBUG, "Logged in using previously claimed OpenID\n");
 853                         }
 854
 855                         /*
 856                          * If this system does not allow self-service new user registration, the
 857                          * remaining modes do not apply, so fail here and now.
 858                          */
 859                         else if (config.c_disable_newu) {
 860                                 cprintf("fail\n");
 861                                 CtdlLogPrintf(CTDL_DEBUG, "Creating user failed due to local policy\n");
 862                         }
 863
 864                         /*
 865                          * New user whose OpenID is verified and Simple Registration Extension is in use?
 866                          */
 867                         else if (openid_create_user_via_sreg(oiddata->claimed_id, keys) == 0) {
 868                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
 869                                 logged_in_response();
 870                                 CtdlLogPrintf(CTDL_DEBUG, "Successfully auto-created new user\n");
 871                         }
 872
 873                         /*
 874                          * OpenID is verified, but the desired username either was not specified or
 875                          * conflicts with an existing user.  Manual account creation is required.
 876                          */
 877                         else {
 878                                 char *desired_name = NULL;
 879                                 cprintf("verify_only\n");
 880                                 cprintf("%s\n", oiddata->claimed_id);
 881                                 if (GetHash(keys, "sreg.nickname", 13, (void *) &desired_name)) {
 882                                         cprintf("%s\n", desired_name);
 883                                 }
 884                                 else {
 885                                         cprintf("\n");
 886                                 }
 887                                 CtdlLogPrintf(CTDL_DEBUG, "The desired Simple Registration name is already taken.\n");
 888                         }
 889                 }
 890         }
 891         else {
 892                 cprintf("fail\n");
 893         }
 894         cprintf("000\n");
 895
 896         if (oiddata->sreg_keys != NULL) {
 897                 DeleteHash(&oiddata->sreg_keys);
 898                 oiddata->sreg_keys = NULL;
 899         }
 900         oiddata->sreg_keys = keys;
 901 }
 902
 903
 904
 905 /**************************************************************************/
 906 /*                                                                        */
 907 /* Functions in this section handle module initialization and shutdown    */
 908 /*                                                                        */
 909 /**************************************************************************/
 910
 911
 912 /*
 913  * This cleanup function blows away the temporary memory used by this module.
 914  */
 915 void openid_cleanup_function(void) {
 916         struct ctdl_openid *oiddata = (struct ctdl_openid *) CC->openid_data;
 917
 918         if (oiddata != NULL) {
 919                 CtdlLogPrintf(CTDL_DEBUG, "Clearing OpenID session state\n");
 920                 if (oiddata->sreg_keys != NULL) {
 921                         DeleteHash(&oiddata->sreg_keys);
 922                         oiddata->sreg_keys = NULL;
 923                 }
 924                 free(oiddata);
 925         }
 926 }
 927
 928
 929 CTDL_MODULE_INIT(openid_rp)
 930 {
 931         if (!threading) {
 932                 curl_global_init(CURL_GLOBAL_ALL);
 933
 934                 /* Only enable the OpenID command set when native mode authentication is in use. */
 935                 if (config.c_auth_mode == AUTHMODE_NATIVE) {
 936                         CtdlRegisterProtoHook(cmd_oids, "OIDS", "Setup OpenID authentication");
 937                         CtdlRegisterProtoHook(cmd_oidf, "OIDF", "Finalize OpenID authentication");
 938                         CtdlRegisterProtoHook(cmd_oidl, "OIDL", "List OpenIDs associated with an account");
 939                         CtdlRegisterProtoHook(cmd_oidd, "OIDD", "Detach an OpenID from an account");
 940                         CtdlRegisterProtoHook(cmd_oidc, "OIDC", "Create new user after validating OpenID");
 941                         CtdlRegisterProtoHook(cmd_oida, "OIDA", "List all OpenIDs in the database");
 942                 }
 943                 CtdlRegisterSessionHook(openid_cleanup_function, EVT_LOGOUT);
 944                 CtdlRegisterUserHook(openid_purge, EVT_PURGEUSER);
 945         }
 946
 947         /* return our Subversion id for the Log */
 948         return "$Id$";
 949 }