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         long usernum = 0L;
 136
 137         keys = NewHash(1, NULL);
 138         if (!keys) return;
 139
 140
 141         cdb_rewind(CDB_OPENID);
 142         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 143                 if (cdboi->len > sizeof(long)) {
 144                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 145                         if (usernum == usbuf->usernum) {
 146                                 deleteme = strdup(cdboi->ptr + sizeof(long)),
 147                                 Put(keys, deleteme, strlen(deleteme), deleteme, generic_free_handler);
 148                         }
 149                 }
 150                 cdb_free(cdboi);
 151         }
 152
 153         /* Go through the hash list, deleting keys we stored in it */
 154
 155         HashPos = GetNewHashPos(keys, 0);
 156         while (GetNextHashPos(keys, HashPos, &len, &Key, &Value)!=0)
 157         {
 158                 CtdlLogPrintf(CTDL_DEBUG, "Deleting associated OpenID <%s>\n", Value);
 159                 cdb_delete(CDB_OPENID, Value, strlen(Value));
 160                 /* note: don't free(Value) -- deleting the hash list will handle this for us */
 161         }
 162         DeleteHashPos(&HashPos);
 163         DeleteHash(&keys);
 164 }
 165
 166
 167
 168 /*
 169  * List the OpenIDs associated with the currently logged in account
 170  */
 171 void cmd_oidl(char *argbuf) {
 172         struct cdbdata *cdboi;
 173         long usernum = 0L;
 174
 175         if (CtdlAccessCheck(ac_logged_in)) return;
 176         cdb_rewind(CDB_OPENID);
 177         cprintf("%d Associated OpenIDs:\n", LISTING_FOLLOWS);
 178
 179         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 180                 if (cdboi->len > sizeof(long)) {
 181                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 182                         if (usernum == CC->user.usernum) {
 183                                 cprintf("%s\n", cdboi->ptr + sizeof(long));
 184                         }
 185                 }
 186                 cdb_free(cdboi);
 187         }
 188         cprintf("000\n");
 189 }
 190
 191
 192 /*
 193  * List ALL OpenIDs in the database
 194  */
 195 void cmd_oida(char *argbuf) {
 196         struct cdbdata *cdboi;
 197         long usernum;
 198         struct ctdluser usbuf;
 199
 200         if (CtdlAccessCheck(ac_aide)) return;
 201         cdb_rewind(CDB_OPENID);
 202         cprintf("%d List of all OpenIDs in the database:\n", LISTING_FOLLOWS);
 203
 204         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 205                 if (cdboi->len > sizeof(long)) {
 206                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 207                         if (getuserbynumber(&usbuf, usernum) != 0) {
 208                                 usbuf.fullname[0] = 0;
 209                         }
 210                         cprintf("%s|%ld|%s\n",
 211                                 cdboi->ptr + sizeof(long),
 212                                 usernum,
 213                                 usbuf.fullname
 214                         );
 215                 }
 216                 cdb_free(cdboi);
 217         }
 218         cprintf("000\n");
 219 }
 220
 221
 222 /*
 223  * Attempt to register (populate the vCard) the currently-logged-in user
 224  * using the data from Simple Registration Extension, if present.
 225  */
 226 void populate_vcard_from_sreg(HashList *sreg_keys) {
 227
 228         struct vCard *v;
 229         int pop = 0;                    /* number of fields populated */
 230         char *data = NULL;
 231         char *postcode = NULL;
 232         char *country = NULL;
 233
 234         if (!sreg_keys) return;
 235         v = vcard_new();
 236         if (!v) return;
 237
 238         if (GetHash(sreg_keys, "identity", 8, (void *) &data)) {
 239                 vcard_add_prop(v, "url;type=openid", data);
 240                 ++pop;
 241         }
 242
 243         if (GetHash(sreg_keys, "sreg.email", 10, (void *) &data)) {
 244                 vcard_add_prop(v, "email;internet", data);
 245                 ++pop;
 246         }
 247
 248         if (GetHash(sreg_keys, "sreg.nickname", 13, (void *) &data)) {
 249                 vcard_add_prop(v, "nickname", data);
 250                 ++pop;
 251         }
 252
 253         if (GetHash(sreg_keys, "sreg.fullname", 13, (void *) &data)) {
 254                 char n[256];
 255                 vcard_add_prop(v, "fn", data);
 256                 vcard_fn_to_n(n, data, sizeof n);
 257                 vcard_add_prop(v, "n", n);
 258                 ++pop;
 259         }
 260
 261         if (!GetHash(sreg_keys, "sreg.postcode", 13, (void *) &postcode)) {
 262                 postcode = NULL;
 263         }
 264
 265         if (!GetHash(sreg_keys, "sreg.country", 12, (void *) &country)) {
 266                 country = NULL;
 267         }
 268
 269         if (postcode || country) {
 270                 char adr[256];
 271                 snprintf(adr, sizeof adr, ";;;;;%s;%s",
 272                         (postcode ? postcode : ""),
 273                         (country ? country : "")
 274                 );
 275                 vcard_add_prop(v, "adr", adr);
 276                 ++pop;
 277         }
 278
 279         if (GetHash(sreg_keys, "sreg.dob", 8, (void *) &data)) {
 280                 vcard_add_prop(v, "bday", data);
 281                 ++pop;
 282         }
 283
 284         if (GetHash(sreg_keys, "sreg.gender", 11, (void *) &data)) {
 285                 vcard_add_prop(v, "x-funambol-gender", data);
 286                 ++pop;
 287         }
 288
 289         /* Only save the vCard if there is some useful data in it */
 290         if (pop > 0) {
 291                 char *ser;
 292                 ser = vcard_serialize(v);
 293                 if (ser) {
 294                         CtdlWriteObject(USERCONFIGROOM, "text/x-vcard",
 295                                 ser, strlen(ser)+1, &CC->user, 0, 0, 0
 296                         );
 297                         free(ser);
 298                 }
 299         }
 300         vcard_free(v);
 301 }
 302
 303
 304 /*
 305  * Create a new user account, manually specifying the name, after successfully
 306  * verifying an OpenID (which will of course be attached to the account)
 307  */
 308 void cmd_oidc(char *argbuf) {
 309         struct ctdl_openid *oiddata = (struct ctdl_openid *) CC->openid_data;
 310
 311         if (!oiddata) {
 312                 cprintf("%d You have not verified an OpenID yet.\n", ERROR);
 313                 return;
 314         }
 315
 316         if (!oiddata->verified) {
 317                 cprintf("%d You have not verified an OpenID yet.\n", ERROR);
 318                 return;
 319         }
 320
 321         /* We can make the semantics of OIDC exactly the same as NEWU, simply
 322          * by _calling_ cmd_newu() and letting it run.  Very clever!
 323          */
 324         cmd_newu(argbuf);
 325
 326         /* Now, if this logged us in, we have to attach the OpenID */
 327         if (CC->logged_in) {
 328                 attach_openid(&CC->user, oiddata->claimed_id);
 329                 if (oiddata->sreg_keys != NULL) {
 330                         populate_vcard_from_sreg(oiddata->sreg_keys);
 331                 }
 332         }
 333
 334 }
 335
 336
 337
 338
 339 /*
 340  * Detach an OpenID from the currently logged in account
 341  */
 342 void cmd_oidd(char *argbuf) {
 343         struct cdbdata *cdboi;
 344         char id_to_detach[1024];
 345         int this_is_mine = 0;
 346         long usernum = 0L;
 347
 348         if (CtdlAccessCheck(ac_logged_in)) return;
 349         extract_token(id_to_detach, argbuf, 0, '|', sizeof id_to_detach);
 350         if (IsEmptyStr(id_to_detach)) {
 351                 cprintf("%d An empty OpenID URL is not allowed.\n", ERROR + ILLEGAL_VALUE);
 352         }
 353
 354         cdb_rewind(CDB_OPENID);
 355         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 356                 if (cdboi->len > sizeof(long)) {
 357                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 358                         if (usernum == CC->user.usernum) {
 359                                 this_is_mine = 1;
 360                         }
 361                 }
 362                 cdb_free(cdboi);
 363         }
 364
 365         if (!this_is_mine) {
 366                 cprintf("%d That OpenID was not found or not associated with your account.\n",
 367                         ERROR + ILLEGAL_VALUE);
 368                 return;
 369         }
 370
 371         cdb_delete(CDB_OPENID, id_to_detach, strlen(id_to_detach));
 372         cprintf("%d %s detached from your account.\n", CIT_OK, id_to_detach);
 373 }
 374
 375
 376
 377 /*
 378  * Attempt to auto-create a new Citadel account using the nickname from Simple Registration Extension
 379  */
 380 int openid_create_user_via_sreg(char *claimed_id, HashList *sreg_keys)
 381 {
 382         char *desired_name = NULL;
 383         char new_password[32];
 384
 385         if (config.c_auth_mode != AUTHMODE_NATIVE) return(1);
 386         if (config.c_disable_newu) return(2);
 387         if (CC->logged_in) return(3);
 388         if (!GetHash(sreg_keys, "sreg.nickname", 13, (void *) &desired_name)) return(4);
 389
 390         CtdlLogPrintf(CTDL_DEBUG, "The desired account name is <%s>\n", desired_name);
 391
 392         if (!getuser(&CC->user, desired_name)) {
 393                 CtdlLogPrintf(CTDL_DEBUG, "<%s> is already taken by another user.\n", desired_name);
 394                 memset(&CC->user, 0, sizeof(struct ctdluser));
 395                 return(5);
 396         }
 397
 398         /* The desired account name is available.  Create the account and log it in! */
 399         if (create_user(desired_name, 1)) return(6);
 400
 401         snprintf(new_password, sizeof new_password, "%08lx%08lx", random(), random());
 402         CtdlSetPassword(new_password);
 403         attach_openid(&CC->user, claimed_id);
 404         populate_vcard_from_sreg(sreg_keys);
 405         return(0);
 406 }
 407
 408
 409 /*
 410  * If a user account exists which is associated with the Claimed ID, log it in and return zero.
 411  * Otherwise it returns nonzero.
 412  */
 413 int login_via_openid(char *claimed_id)
 414 {
 415         struct cdbdata *cdboi;
 416         long usernum = 0;
 417
 418         cdboi = cdb_fetch(CDB_OPENID, claimed_id, strlen(claimed_id));
 419         if (cdboi == NULL) {
 420                 return(-1);
 421         }
 422
 423         memcpy(&usernum, cdboi->ptr, sizeof(long));
 424         cdb_free(cdboi);
 425
 426         if (!getuserbynumber(&CC->user, usernum)) {
 427                 /* Now become the user we just created */
 428                 safestrncpy(CC->curr_user, CC->user.fullname, sizeof CC->curr_user);
 429                 do_login();
 430                 return(0);
 431         }
 432         else {
 433                 memset(&CC->user, 0, sizeof(struct ctdluser));
 434                 return(-1);
 435         }
 436 }
 437
 438
 439
 440
 441 /**************************************************************************/
 442 /*                                                                        */
 443 /* Functions in this section handle OpenID protocol                       */
 444 /*                                                                        */
 445 /**************************************************************************/
 446
 447
 448 /*
 449  * Locate a <link> tag and, given its 'rel=' parameter, return its 'href' parameter
 450  */
 451 void extract_link(char *target_buf, int target_size, char *rel, char *source_buf)
 452 {
 453         char *ptr = source_buf;
 454
 455         if (!target_buf) return;
 456         if (!rel) return;
 457         if (!source_buf) return;
 458
 459         target_buf[0] = 0;
 460
 461         while (ptr = bmstrcasestr(ptr, "<link"), ptr != NULL) {
 462
 463                 char work_buffer[2048];
 464                 char *link_tag_start = NULL;
 465                 char *link_tag_end = NULL;
 466
 467                 char rel_tag[2048];
 468                 char href_tag[2048];
 469
 470                 link_tag_start = ptr;
 471                 link_tag_end = strchr(ptr, '>');
 472                 rel_tag[0] = 0;
 473                 href_tag[0] = 0;
 474
 475                 if ((link_tag_end) && (link_tag_end > link_tag_start)) {
 476                         int len;
 477                         len = link_tag_end - link_tag_start;
 478                         if (len > sizeof work_buffer) len = sizeof work_buffer;
 479                         memcpy(work_buffer, link_tag_start, len);
 480
 481                         char *rel_start = NULL;
 482                         char *rel_end = NULL;
 483                         rel_start = bmstrcasestr(work_buffer, "rel=");
 484                         if (rel_start) {
 485                                 rel_start = strchr(rel_start, '\"');
 486                                 if (rel_start) {
 487                                         ++rel_start;
 488                                         rel_end = strchr(rel_start, '\"');
 489                                         if ((rel_end) && (rel_end > rel_start)) {
 490                                                 safestrncpy(rel_tag, rel_start, rel_end - rel_start + 1);
 491                                         }
 492                                 }
 493                         }
 494
 495                         char *href_start = NULL;
 496                         char *href_end = NULL;
 497                         href_start = bmstrcasestr(work_buffer, "href=");
 498                         if (href_start) {
 499                                 href_start = strchr(href_start, '\"');
 500                                 if (href_start) {
 501                                         ++href_start;
 502                                         href_end = strchr(href_start, '\"');
 503                                         if ((href_end) && (href_end > href_start)) {
 504                                                 safestrncpy(href_tag, href_start, href_end - href_start + 1);
 505                                         }
 506                                 }
 507                         }
 508
 509                         if (!strcasecmp(rel, rel_tag)) {
 510                                 safestrncpy(target_buf, href_tag, target_size);
 511                                 return;
 512                         }
 513
 514                 }
 515
 516         ++ptr;
 517         }
 518
 519
 520 }
 521
 522
 523
 524 struct fh_data {
 525         char *buf;
 526         int total_bytes_received;
 527         int maxbytes;
 528 };
 529
 530
 531 size_t fh_callback(void *ptr, size_t size, size_t nmemb, void *stream)
 532 {
 533         struct fh_data *fh = (struct fh_data *) stream;
 534         int got_bytes = (size * nmemb);
 535
 536         if (fh->total_bytes_received + got_bytes > fh->maxbytes) {
 537                 got_bytes = fh->maxbytes - fh->total_bytes_received;
 538         }
 539         if (got_bytes > 0) {
 540                 memcpy(&fh->buf[fh->total_bytes_received], ptr, got_bytes);
 541                 fh->total_bytes_received += got_bytes;
 542         }
 543
 544         return (size * nmemb);  /* always succeed; libcurl doesn't need to know if we truncated it */
 545 }
 546
 547
 548
 549 /*
 550  * Begin an HTTP fetch (returns number of bytes actually fetched, or -1 for error) using libcurl.
 551  *
 552  * If 'normalize_len' is nonzero, the caller is specifying the buffer size of 'url', and is
 553  * requesting that the effective (normalized) URL be copied back to it.
 554  */
 555 int fetch_http(char *url, char *target_buf, int maxbytes, int normalize_len)
 556 {
 557         CURL *curl;
 558         CURLcode res;
 559         char errmsg[1024] = "";
 560         struct fh_data fh = {
 561                 target_buf,
 562                 0,
 563                 maxbytes
 564         };
 565         char *effective_url = NULL;
 566
 567         if (!url) return(-1);
 568         if (!target_buf) return(-1);
 569         memset(target_buf, 0, maxbytes);
 570
 571         curl = curl_easy_init();
 572         if (!curl) {
 573                 CtdlLogPrintf(CTDL_ALERT, "Unable to initialize libcurl.\n");
 574                 return(-1);
 575         }
 576
 577         curl_easy_setopt(curl, CURLOPT_URL, url);
 578         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 579         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 580         curl_easy_setopt(curl, CURLOPT_WRITEDATA, &fh);
 581         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fh_callback);
 582         curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
 583         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 584 #ifdef CURLOPT_HTTP_CONTENT_DECODING
 585         curl_easy_setopt(curl, CURLOPT_HTTP_CONTENT_DECODING, 1);
 586         curl_easy_setopt(curl, CURLOPT_ENCODING, "");
 587 #endif
 588         curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
 589         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 180);           /* die after 180 seconds */
 590         if (!IsEmptyStr(config.c_ip_addr)) {
 591                 curl_easy_setopt(curl, CURLOPT_INTERFACE, config.c_ip_addr);
 592         }
 593         res = curl_easy_perform(curl);
 594         if (res) {
 595                 CtdlLogPrintf(CTDL_DEBUG, "fetch_http() libcurl error %d: %s\n", res, errmsg);
 596         }
 597         if (normalize_len > 0) {
 598                 curl_easy_getinfo(curl, CURLINFO_EFFECTIVE_URL, &effective_url);
 599                 safestrncpy(url, effective_url, normalize_len);
 600         }
 601         curl_easy_cleanup(curl);
 602         return fh.total_bytes_received;
 603 }
 604
 605
 606 /*
 607  * Setup an OpenID authentication
 608  */
 609 void cmd_oids(char *argbuf) {
 610         char return_to[1024];
 611         char trust_root[1024];
 612         int i;
 613         char buf[SIZ];
 614         struct CitContext *CCC = CC;    /* CachedCitContext - performance boost */
 615         struct ctdl_openid *oiddata;
 616
 617         oiddata = (struct ctdl_openid *) CCC->openid_data;
 618
 619         if (oiddata != NULL) {
 620                 if (oiddata->sreg_keys != NULL) {
 621                         DeleteHash(&oiddata->sreg_keys);
 622                         oiddata->sreg_keys = NULL;
 623                 }
 624                 free(CCC->openid_data);
 625         }
 626         oiddata = malloc(sizeof(struct ctdl_openid));
 627         if (oiddata == NULL) {
 628                 cprintf("%d malloc failed\n", ERROR + INTERNAL_ERROR);
 629                 return;
 630         }
 631         memset(oiddata, 0, sizeof(struct ctdl_openid));
 632         CCC->openid_data = (void *) oiddata;
 633
 634         extract_token(oiddata->claimed_id, argbuf, 0, '|', sizeof oiddata->claimed_id);
 635         extract_token(return_to, argbuf, 1, '|', sizeof return_to);
 636         extract_token(trust_root, argbuf, 2, '|', sizeof trust_root);
 637         oiddata->verified = 0;
 638
 639         i = fetch_http(oiddata->claimed_id, buf, sizeof buf - 1, sizeof oiddata->claimed_id);
 640         CtdlLogPrintf(CTDL_DEBUG, "Normalized URL and Claimed ID is: %s\n", oiddata->claimed_id);
 641         buf[sizeof buf - 1] = 0;
 642         if (i > 0) {
 643                 char openid_delegate[1024];
 644
 645                 extract_link(oiddata->server, sizeof oiddata->server, "openid.server", buf);
 646                 extract_link(openid_delegate, sizeof openid_delegate, "openid.delegate", buf);
 647
 648                 if (IsEmptyStr(oiddata->server)) {
 649                         cprintf("%d There is no OpenID identity provider at this URL.\n", ERROR);
 650                         return;
 651                 }
 652
 653                 /* Empty delegate is legal; we just use the openid_url instead */
 654                 if (IsEmptyStr(openid_delegate)) {
 655                         safestrncpy(openid_delegate, oiddata->claimed_id, sizeof openid_delegate);
 656                 }
 657
 658                 /* Assemble a URL to which the user-agent will be redirected. */
 659                 char redirect_string[4096];
 660                 char escaped_identity[512];
 661                 char escaped_return_to[2048];
 662                 char escaped_trust_root[1024];
 663                 char escaped_sreg_optional[256];
 664
 665                 urlesc(escaped_identity, sizeof escaped_identity, openid_delegate);
 666                 urlesc(escaped_return_to, sizeof escaped_return_to, return_to);
 667                 urlesc(escaped_trust_root, sizeof escaped_trust_root, trust_root);
 668                 urlesc(escaped_sreg_optional, sizeof escaped_sreg_optional,
 669                         "nickname,email,fullname,postcode,country,dob,gender");
 670
 671                 snprintf(redirect_string, sizeof redirect_string,
 672                         "%s"
 673                         "?openid.mode=checkid_setup"
 674                         "&openid.identity=%s"
 675                         "&openid.return_to=%s"
 676                         "&openid.trust_root=%s"
 677                         "&openid.sreg.optional=%s"
 678                         ,
 679                         oiddata->server,
 680                         escaped_identity,
 681                         escaped_return_to,
 682                         escaped_trust_root,
 683                         escaped_sreg_optional
 684                 );
 685                 cprintf("%d %s\n", CIT_OK, redirect_string);
 686                 return;
 687         }
 688
 689         cprintf("%d Unable to fetch OpenID URL\n", ERROR);
 690 }
 691
 692
 693
 694
 695
 696 /*
 697  * Finalize an OpenID authentication
 698  */
 699 void cmd_oidf(char *argbuf) {
 700         char buf[2048];
 701         char thiskey[1024];
 702         char thisdata[1024];
 703         HashList *keys = NULL;
 704         struct ctdl_openid *oiddata = (struct ctdl_openid *) CC->openid_data;
 705
 706         keys = NewHash(1, NULL);
 707         if (!keys) {
 708                 cprintf("%d NewHash() failed\n", ERROR + INTERNAL_ERROR);
 709                 return;
 710         }
 711
 712         cprintf("%d Transmit OpenID data now\n", START_CHAT_MODE);
 713
 714         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 715                 extract_token(thiskey, buf, 0, '|', sizeof thiskey);
 716                 extract_token(thisdata, buf, 1, '|', sizeof thisdata);
 717                 CtdlLogPrintf(CTDL_DEBUG, "%s: [%d] %s\n", thiskey, strlen(thisdata), thisdata);
 718                 Put(keys, thiskey, strlen(thiskey), strdup(thisdata), generic_free_handler);
 719         }
 720
 721
 722         /* Now that we have all of the parameters, we have to validate the signature against the server */
 723         CtdlLogPrintf(CTDL_DEBUG, "About to validate the signature...\n");
 724
 725         CURL *curl;
 726         CURLcode res;
 727         struct curl_httppost *formpost = NULL;
 728         struct curl_httppost *lastptr = NULL;
 729         char errmsg[1024] = "";
 730         char *o_assoc_handle = NULL;
 731         char *o_sig = NULL;
 732         char *o_signed = NULL;
 733         int num_signed_values;
 734         int i;
 735         char k_keyname[128];
 736         char k_o_keyname[128];
 737         char *k_value = NULL;
 738         char valbuf[1024];
 739
 740         struct fh_data fh = {
 741                 valbuf,
 742                 0,
 743                 sizeof valbuf
 744         };
 745
 746         curl_formadd(&formpost, &lastptr,
 747                 CURLFORM_COPYNAME,      "openid.mode",
 748                 CURLFORM_COPYCONTENTS,  "check_authentication",
 749                 CURLFORM_END);
 750         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.mode", "check_authentication");
 751
 752         if (GetHash(keys, "assoc_handle", 12, (void *) &o_assoc_handle)) {
 753                 curl_formadd(&formpost, &lastptr,
 754                         CURLFORM_COPYNAME,      "openid.assoc_handle",
 755                         CURLFORM_COPYCONTENTS,  o_assoc_handle,
 756                         CURLFORM_END);
 757                 CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.assoc_handle", o_assoc_handle);
 758         }
 759
 760         if (GetHash(keys, "sig", 3, (void *) &o_sig)) {
 761                 curl_formadd(&formpost, &lastptr,
 762                         CURLFORM_COPYNAME,      "openid.sig",
 763                         CURLFORM_COPYCONTENTS,  o_sig,
 764                         CURLFORM_END);
 765                         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.sig", o_sig);
 766         }
 767
 768         if (GetHash(keys, "signed", 6, (void *) &o_signed)) {
 769                 curl_formadd(&formpost, &lastptr,
 770                         CURLFORM_COPYNAME,      "openid.signed",
 771                         CURLFORM_COPYCONTENTS,  o_signed,
 772                         CURLFORM_END);
 773                 CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.signed", o_signed);
 774
 775                 num_signed_values = num_tokens(o_signed, ',');
 776                 for (i=0; i<num_signed_values; ++i) {
 777                         extract_token(k_keyname, o_signed, i, ',', sizeof k_keyname);
 778                         if (strcasecmp(k_keyname, "mode")) {    // work around phpMyID bug
 779                                 if (GetHash(keys, k_keyname, strlen(k_keyname), (void *) &k_value)) {
 780                                         snprintf(k_o_keyname, sizeof k_o_keyname, "openid.%s", k_keyname);
 781                                         curl_formadd(&formpost, &lastptr,
 782                                                 CURLFORM_COPYNAME,      k_o_keyname,
 783                                                 CURLFORM_COPYCONTENTS,  k_value,
 784                                                 CURLFORM_END);
 785                                         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", k_o_keyname, k_value);
 786                                 }
 787                                 else {
 788                                         CtdlLogPrintf(CTDL_INFO, "OpenID: signed field '%s' is missing\n",
 789                                                 k_keyname);
 790                                 }
 791                         }
 792                 }
 793         }
 794
 795         curl = curl_easy_init();
 796         curl_easy_setopt(curl, CURLOPT_URL, oiddata->server);
 797         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 798         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 799         curl_easy_setopt(curl, CURLOPT_WRITEDATA, &fh);
 800         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fh_callback);
 801         curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 802         curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
 803         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 804 #ifdef CURLOPT_HTTP_CONTENT_DECODING
 805         curl_easy_setopt(curl, CURLOPT_HTTP_CONTENT_DECODING, 1);
 806         curl_easy_setopt(curl, CURLOPT_ENCODING, "");
 807 #endif
 808         curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
 809         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 180);           /* die after 180 seconds */
 810         if (!IsEmptyStr(config.c_ip_addr)) {
 811                 curl_easy_setopt(curl, CURLOPT_INTERFACE, config.c_ip_addr);
 812         }
 813
 814         res = curl_easy_perform(curl);
 815         if (res) {
 816                 CtdlLogPrintf(CTDL_DEBUG, "cmd_oidf() libcurl error %d: %s\n", res, errmsg);
 817         }
 818         curl_easy_cleanup(curl);
 819         curl_formfree(formpost);
 820
 821         valbuf[fh.total_bytes_received] = 0;
 822
 823         if (bmstrcasestr(valbuf, "is_valid:true")) {
 824                 oiddata->verified = 1;
 825         }
 826
 827         CtdlLogPrintf(CTDL_DEBUG, "Authentication %s.\n", (oiddata->verified ? "succeeded" : "failed") );
 828
 829         /* Respond to the client */
 830
 831         if (oiddata->verified) {
 832
 833                 /* If we were already logged in, attach the OpenID to the user's account */
 834                 if (CC->logged_in) {
 835                         if (attach_openid(&CC->user, oiddata->claimed_id) == 0) {
 836                                 cprintf("attach\n");
 837                                 CtdlLogPrintf(CTDL_DEBUG, "OpenID attach succeeded\n");
 838                         }
 839                         else {
 840                                 cprintf("fail\n");
 841                                 CtdlLogPrintf(CTDL_DEBUG, "OpenID attach failed\n");
 842                         }
 843                 }
 844
 845                 /* Otherwise, a user is attempting to log in using the verified OpenID */
 846                 else {
 847                         /*
 848                          * Existing user who has claimed this OpenID?
 849                          *
 850                          * Note: if you think that sending the password back over the wire is insecure,
 851                          * check your assumptions.  If someone has successfully asserted an OpenID that
 852                          * is associated with the account, they already have password equivalency and can
 853                          * login, so they could just as easily change the password, etc.
 854                          */
 855                         if (login_via_openid(oiddata->claimed_id) == 0) {
 856                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
 857                                 logged_in_response();
 858                                 CtdlLogPrintf(CTDL_DEBUG, "Logged in using previously claimed OpenID\n");
 859                         }
 860
 861                         /*
 862                          * If this system does not allow self-service new user registration, the
 863                          * remaining modes do not apply, so fail here and now.
 864                          */
 865                         else if (config.c_disable_newu) {
 866                                 cprintf("fail\n");
 867                                 CtdlLogPrintf(CTDL_DEBUG, "Creating user failed due to local policy\n");
 868                         }
 869
 870                         /*
 871                          * New user whose OpenID is verified and Simple Registration Extension is in use?
 872                          */
 873                         else if (openid_create_user_via_sreg(oiddata->claimed_id, keys) == 0) {
 874                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
 875                                 logged_in_response();
 876                                 CtdlLogPrintf(CTDL_DEBUG, "Successfully auto-created new user\n");
 877                         }
 878
 879                         /*
 880                          * OpenID is verified, but the desired username either was not specified or
 881                          * conflicts with an existing user.  Manual account creation is required.
 882                          */
 883                         else {
 884                                 char *desired_name = NULL;
 885                                 cprintf("verify_only\n");
 886                                 cprintf("%s\n", oiddata->claimed_id);
 887                                 if (GetHash(keys, "sreg.nickname", 13, (void *) &desired_name)) {
 888                                         cprintf("%s\n", desired_name);
 889                                 }
 890                                 else {
 891                                         cprintf("\n");
 892                                 }
 893                                 CtdlLogPrintf(CTDL_DEBUG, "The desired Simple Registration name is already taken.\n");
 894                         }
 895                 }
 896         }
 897         else {
 898                 cprintf("fail\n");
 899         }
 900         cprintf("000\n");
 901
 902         if (oiddata->sreg_keys != NULL) {
 903                 DeleteHash(&oiddata->sreg_keys);
 904                 oiddata->sreg_keys = NULL;
 905         }
 906         oiddata->sreg_keys = keys;
 907 }
 908
 909
 910
 911 /**************************************************************************/
 912 /*                                                                        */
 913 /* Functions in this section handle module initialization and shutdown    */
 914 /*                                                                        */
 915 /**************************************************************************/
 916
 917
 918 /*
 919  * This cleanup function blows away the temporary memory used by this module.
 920  */
 921 void openid_cleanup_function(void) {
 922         struct ctdl_openid *oiddata = (struct ctdl_openid *) CC->openid_data;
 923
 924         if (oiddata != NULL) {
 925                 CtdlLogPrintf(CTDL_DEBUG, "Clearing OpenID session state\n");
 926                 if (oiddata->sreg_keys != NULL) {
 927                         DeleteHash(&oiddata->sreg_keys);
 928                         oiddata->sreg_keys = NULL;
 929                 }
 930                 free(oiddata);
 931         }
 932 }
 933
 934
 935 CTDL_MODULE_INIT(openid_rp)
 936 {
 937         if (!threading) {
 938                 curl_global_init(CURL_GLOBAL_ALL);
 939
 940                 /* Only enable the OpenID command set when native mode authentication is in use. */
 941                 if (config.c_auth_mode == AUTHMODE_NATIVE) {
 942                         CtdlRegisterProtoHook(cmd_oids, "OIDS", "Setup OpenID authentication");
 943                         CtdlRegisterProtoHook(cmd_oidf, "OIDF", "Finalize OpenID authentication");
 944                         CtdlRegisterProtoHook(cmd_oidl, "OIDL", "List OpenIDs associated with an account");
 945                         CtdlRegisterProtoHook(cmd_oidd, "OIDD", "Detach an OpenID from an account");
 946                         CtdlRegisterProtoHook(cmd_oidc, "OIDC", "Create new user after validating OpenID");
 947                         CtdlRegisterProtoHook(cmd_oida, "OIDA", "List all OpenIDs in the database");
 948                 }
 949                 CtdlRegisterSessionHook(openid_cleanup_function, EVT_LOGOUT);
 950                 CtdlRegisterUserHook(openid_purge, EVT_PURGEUSER);
 951         }
 952
 953         /* return our Subversion id for the Log */
 954         return "$Id$";
 955 }