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  * Copyright (c) 2007-2009 by the citadel.org team
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 3 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include "sysdep.h"
  24 #include <stdlib.h>
  25 #include <unistd.h>
  26 #include <stdio.h>
  27 #include <fcntl.h>
  28 #include <signal.h>
  29 #include <pwd.h>
  30 #include <errno.h>
  31 #include <sys/types.h>
  32
  33 #if TIME_WITH_SYS_TIME
  34 # include <sys/time.h>
  35 # include <time.h>
  36 #else
  37 # if HAVE_SYS_TIME_H
  38 #  include <sys/time.h>
  39 # else
  40 #  include <time.h>
  41 # endif
  42 #endif
  43
  44 #include <sys/wait.h>
  45 #include <string.h>
  46 #include <limits.h>
  47 #include <curl/curl.h>
  48 #include "ctdl_module.h"
  49 #include "config.h"
  50 #include "citserver.h"
  51 #include "user_ops.h"
  52
  53 struct ctdl_openid {
  54         char claimed_id[1024];
  55         char server[1024];
  56         int verified;
  57         HashList *sreg_keys;
  58 };
  59
  60
  61
  62
  63
  64 /**************************************************************************/
  65 /*                                                                        */
  66 /* Functions in this section handle Citadel internal OpenID mapping stuff */
  67 /*                                                                        */
  68 /**************************************************************************/
  69
  70
  71 /*
  72  * The structure of an openid record *key* is:
  73  *
  74  * |--------------claimed_id-------------|
  75  *     (actual length of claimed id)
  76  *
  77  *
  78  * The structure of an openid record *value* is:
  79  *
  80  * |-----user_number----|------------claimed_id---------------|
  81  *    (sizeof long)          (actual length of claimed id)
  82  *
  83  */
  84
  85
  86
  87 /*
  88  * Attach an OpenID to a Citadel account
  89  */
  90 int attach_openid(struct ctdluser *who, char *claimed_id)
  91 {
  92         struct cdbdata *cdboi;
  93         long fetched_usernum;
  94         char *data;
  95         int data_len;
  96         char buf[2048];
  97
  98         if (!who) return(1);
  99         if (!claimed_id) return(1);
 100         if (IsEmptyStr(claimed_id)) return(1);
 101
 102         /* Check to see if this OpenID is already in the database */
 103
 104         cdboi = cdb_fetch(CDB_OPENID, claimed_id, strlen(claimed_id));
 105         if (cdboi != NULL) {
 106                 memcpy(&fetched_usernum, cdboi->ptr, sizeof(long));
 107                 cdb_free(cdboi);
 108
 109                 if (fetched_usernum == who->usernum) {
 110                         CtdlLogPrintf(CTDL_INFO, "%s already associated; no action is taken\n", claimed_id);
 111                         return(0);
 112                 }
 113                 else {
 114                         CtdlLogPrintf(CTDL_INFO, "%s already belongs to another user\n", claimed_id);
 115                         return(3);
 116                 }
 117         }
 118
 119         /* Not already in the database, so attach it now */
 120
 121         data_len = sizeof(long) + strlen(claimed_id) + 1;
 122         data = malloc(data_len);
 123
 124         memcpy(data, &who->usernum, sizeof(long));
 125         memcpy(&data[sizeof(long)], claimed_id, strlen(claimed_id) + 1);
 126
 127         cdb_store(CDB_OPENID, claimed_id, strlen(claimed_id), data, data_len);
 128         free(data);
 129
 130         snprintf(buf, sizeof buf, "User <%s> (#%ld) has claimed the OpenID URL %s\n",
 131                 who->fullname, who->usernum, claimed_id);
 132         aide_message(buf, "OpenID claim");
 133         CtdlLogPrintf(CTDL_INFO, "%s", buf);
 134         return(0);
 135 }
 136
 137
 138
 139 /*
 140  * When a user is being deleted, we have to delete any OpenID associations
 141  */
 142 void openid_purge(struct ctdluser *usbuf) {
 143         struct cdbdata *cdboi;
 144         HashList *keys = NULL;
 145         HashPos *HashPos;
 146         char *deleteme = NULL;
 147         long len;
 148         void *Value;
 149         const char *Key;
 150         long usernum = 0L;
 151
 152         keys = NewHash(1, NULL);
 153         if (!keys) return;
 154
 155
 156         cdb_rewind(CDB_OPENID);
 157         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 158                 if (cdboi->len > sizeof(long)) {
 159                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 160                         if (usernum == usbuf->usernum) {
 161                                 deleteme = strdup(cdboi->ptr + sizeof(long)),
 162                                 Put(keys, deleteme, strlen(deleteme), deleteme, generic_free_handler);
 163                         }
 164                 }
 165                 cdb_free(cdboi);
 166         }
 167
 168         /* Go through the hash list, deleting keys we stored in it */
 169
 170         HashPos = GetNewHashPos(keys, 0);
 171         while (GetNextHashPos(keys, HashPos, &len, &Key, &Value)!=0)
 172         {
 173                 CtdlLogPrintf(CTDL_DEBUG, "Deleting associated OpenID <%s>\n", Value);
 174                 cdb_delete(CDB_OPENID, Value, strlen(Value));
 175                 /* note: don't free(Value) -- deleting the hash list will handle this for us */
 176         }
 177         DeleteHashPos(&HashPos);
 178         DeleteHash(&keys);
 179 }
 180
 181
 182
 183 /*
 184  * List the OpenIDs associated with the currently logged in account
 185  */
 186 void cmd_oidl(char *argbuf) {
 187         struct cdbdata *cdboi;
 188         long usernum = 0L;
 189
 190         if (CtdlAccessCheck(ac_logged_in)) return;
 191         cdb_rewind(CDB_OPENID);
 192         cprintf("%d Associated OpenIDs:\n", LISTING_FOLLOWS);
 193
 194         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 195                 if (cdboi->len > sizeof(long)) {
 196                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 197                         if (usernum == CC->user.usernum) {
 198                                 cprintf("%s\n", cdboi->ptr + sizeof(long));
 199                         }
 200                 }
 201                 cdb_free(cdboi);
 202         }
 203         cprintf("000\n");
 204 }
 205
 206
 207 /*
 208  * List ALL OpenIDs in the database
 209  */
 210 void cmd_oida(char *argbuf) {
 211         struct cdbdata *cdboi;
 212         long usernum;
 213         struct ctdluser usbuf;
 214
 215         if (CtdlAccessCheck(ac_aide)) return;
 216         cdb_rewind(CDB_OPENID);
 217         cprintf("%d List of all OpenIDs in the database:\n", LISTING_FOLLOWS);
 218
 219         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 220                 if (cdboi->len > sizeof(long)) {
 221                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 222                         if (getuserbynumber(&usbuf, usernum) != 0) {
 223                                 usbuf.fullname[0] = 0;
 224                         }
 225                         cprintf("%s|%ld|%s\n",
 226                                 cdboi->ptr + sizeof(long),
 227                                 usernum,
 228                                 usbuf.fullname
 229                         );
 230                 }
 231                 cdb_free(cdboi);
 232         }
 233         cprintf("000\n");
 234 }
 235
 236
 237 /*
 238  * Attempt to register (populate the vCard) the currently-logged-in user
 239  * using the data from Simple Registration Extension, if present.
 240  */
 241 void populate_vcard_from_sreg(HashList *sreg_keys) {
 242
 243         struct vCard *v;
 244         int pop = 0;                    /* number of fields populated */
 245         char *data = NULL;
 246         char *postcode = NULL;
 247         char *country = NULL;
 248
 249         if (!sreg_keys) return;
 250         v = vcard_new();
 251         if (!v) return;
 252
 253         if (GetHash(sreg_keys, "identity", 8, (void *) &data)) {
 254                 vcard_add_prop(v, "url;type=openid", data);
 255                 ++pop;
 256         }
 257
 258         if (GetHash(sreg_keys, "sreg.email", 10, (void *) &data)) {
 259                 vcard_add_prop(v, "email;internet", data);
 260                 ++pop;
 261         }
 262
 263         if (GetHash(sreg_keys, "sreg.nickname", 13, (void *) &data)) {
 264                 vcard_add_prop(v, "nickname", data);
 265                 ++pop;
 266         }
 267
 268         if (GetHash(sreg_keys, "sreg.fullname", 13, (void *) &data)) {
 269                 char n[256];
 270                 vcard_add_prop(v, "fn", data);
 271                 vcard_fn_to_n(n, data, sizeof n);
 272                 vcard_add_prop(v, "n", n);
 273                 ++pop;
 274         }
 275
 276         if (!GetHash(sreg_keys, "sreg.postcode", 13, (void *) &postcode)) {
 277                 postcode = NULL;
 278         }
 279
 280         if (!GetHash(sreg_keys, "sreg.country", 12, (void *) &country)) {
 281                 country = NULL;
 282         }
 283
 284         if (postcode || country) {
 285                 char adr[256];
 286                 snprintf(adr, sizeof adr, ";;;;;%s;%s",
 287                         (postcode ? postcode : ""),
 288                         (country ? country : "")
 289                 );
 290                 vcard_add_prop(v, "adr", adr);
 291                 ++pop;
 292         }
 293
 294         if (GetHash(sreg_keys, "sreg.dob", 8, (void *) &data)) {
 295                 vcard_add_prop(v, "bday", data);
 296                 ++pop;
 297         }
 298
 299         if (GetHash(sreg_keys, "sreg.gender", 11, (void *) &data)) {
 300                 vcard_add_prop(v, "x-funambol-gender", data);
 301                 ++pop;
 302         }
 303
 304         /* Only save the vCard if there is some useful data in it */
 305         if (pop > 0) {
 306                 char *ser;
 307                 ser = vcard_serialize(v);
 308                 if (ser) {
 309                         CtdlWriteObject(USERCONFIGROOM, "text/x-vcard",
 310                                 ser, strlen(ser)+1, &CC->user, 0, 0, 0
 311                         );
 312                         free(ser);
 313                 }
 314         }
 315         vcard_free(v);
 316 }
 317
 318
 319 /*
 320  * Create a new user account, manually specifying the name, after successfully
 321  * verifying an OpenID (which will of course be attached to the account)
 322  */
 323 void cmd_oidc(char *argbuf) {
 324         struct ctdl_openid *oiddata = (struct ctdl_openid *) CC->openid_data;
 325
 326         if (!oiddata) {
 327                 cprintf("%d You have not verified an OpenID yet.\n", ERROR);
 328                 return;
 329         }
 330
 331         if (!oiddata->verified) {
 332                 cprintf("%d You have not verified an OpenID yet.\n", ERROR);
 333                 return;
 334         }
 335
 336         /* We can make the semantics of OIDC exactly the same as NEWU, simply
 337          * by _calling_ cmd_newu() and letting it run.  Very clever!
 338          */
 339         cmd_newu(argbuf);
 340
 341         /* Now, if this logged us in, we have to attach the OpenID */
 342         if (CC->logged_in) {
 343                 attach_openid(&CC->user, oiddata->claimed_id);
 344                 if (oiddata->sreg_keys != NULL) {
 345                         populate_vcard_from_sreg(oiddata->sreg_keys);
 346                 }
 347         }
 348
 349 }
 350
 351
 352
 353
 354 /*
 355  * Detach an OpenID from the currently logged in account
 356  */
 357 void cmd_oidd(char *argbuf) {
 358         struct cdbdata *cdboi;
 359         char id_to_detach[1024];
 360         int this_is_mine = 0;
 361         long usernum = 0L;
 362
 363         if (CtdlAccessCheck(ac_logged_in)) return;
 364         extract_token(id_to_detach, argbuf, 0, '|', sizeof id_to_detach);
 365         if (IsEmptyStr(id_to_detach)) {
 366                 cprintf("%d An empty OpenID URL is not allowed.\n", ERROR + ILLEGAL_VALUE);
 367         }
 368
 369         cdb_rewind(CDB_OPENID);
 370         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 371                 if (cdboi->len > sizeof(long)) {
 372                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 373                         if (usernum == CC->user.usernum) {
 374                                 this_is_mine = 1;
 375                         }
 376                 }
 377                 cdb_free(cdboi);
 378         }
 379
 380         if (!this_is_mine) {
 381                 cprintf("%d That OpenID was not found or not associated with your account.\n",
 382                         ERROR + ILLEGAL_VALUE);
 383                 return;
 384         }
 385
 386         cdb_delete(CDB_OPENID, id_to_detach, strlen(id_to_detach));
 387         cprintf("%d %s detached from your account.\n", CIT_OK, id_to_detach);
 388 }
 389
 390
 391
 392 /*
 393  * Attempt to auto-create a new Citadel account using the nickname from Simple Registration Extension
 394  */
 395 int openid_create_user_via_sreg(char *claimed_id, HashList *sreg_keys)
 396 {
 397         char *desired_name = NULL;
 398         char new_password[32];
 399
 400         if (config.c_auth_mode != AUTHMODE_NATIVE) return(1);
 401         if (config.c_disable_newu) return(2);
 402         if (CC->logged_in) return(3);
 403         if (!GetHash(sreg_keys, "sreg.nickname", 13, (void *) &desired_name)) return(4);
 404
 405         CtdlLogPrintf(CTDL_DEBUG, "The desired account name is <%s>\n", desired_name);
 406
 407         if (!getuser(&CC->user, desired_name)) {
 408                 CtdlLogPrintf(CTDL_DEBUG, "<%s> is already taken by another user.\n", desired_name);
 409                 memset(&CC->user, 0, sizeof(struct ctdluser));
 410                 return(5);
 411         }
 412
 413         /* The desired account name is available.  Create the account and log it in! */
 414         if (create_user(desired_name, 1)) return(6);
 415
 416         snprintf(new_password, sizeof new_password, "%08lx%08lx", random(), random());
 417         CtdlSetPassword(new_password);
 418         attach_openid(&CC->user, claimed_id);
 419         populate_vcard_from_sreg(sreg_keys);
 420         return(0);
 421 }
 422
 423
 424 /*
 425  * If a user account exists which is associated with the Claimed ID, log it in and return zero.
 426  * Otherwise it returns nonzero.
 427  */
 428 int login_via_openid(char *claimed_id)
 429 {
 430         struct cdbdata *cdboi;
 431         long usernum = 0;
 432
 433         cdboi = cdb_fetch(CDB_OPENID, claimed_id, strlen(claimed_id));
 434         if (cdboi == NULL) {
 435                 return(-1);
 436         }
 437
 438         memcpy(&usernum, cdboi->ptr, sizeof(long));
 439         cdb_free(cdboi);
 440
 441         if (!getuserbynumber(&CC->user, usernum)) {
 442                 /* Now become the user we just created */
 443                 safestrncpy(CC->curr_user, CC->user.fullname, sizeof CC->curr_user);
 444                 do_login();
 445                 return(0);
 446         }
 447         else {
 448                 memset(&CC->user, 0, sizeof(struct ctdluser));
 449                 return(-1);
 450         }
 451 }
 452
 453
 454
 455
 456 /**************************************************************************/
 457 /*                                                                        */
 458 /* Functions in this section handle OpenID protocol                       */
 459 /*                                                                        */
 460 /**************************************************************************/
 461
 462
 463 /*
 464  * Locate a <link> tag and, given its 'rel=' parameter, return its 'href' parameter
 465  */
 466 void extract_link(char *target_buf, int target_size, char *rel, char *source_buf)
 467 {
 468         char *ptr = source_buf;
 469
 470         if (!target_buf) return;
 471         if (!rel) return;
 472         if (!source_buf) return;
 473
 474         target_buf[0] = 0;
 475
 476         while (ptr = bmstrcasestr(ptr, "<link"), ptr != NULL) {
 477
 478                 char work_buffer[2048];
 479                 char *link_tag_start = NULL;
 480                 char *link_tag_end = NULL;
 481
 482                 char rel_tag[2048];
 483                 char href_tag[2048];
 484
 485                 link_tag_start = ptr;
 486                 link_tag_end = strchr(ptr, '>');
 487                 rel_tag[0] = 0;
 488                 href_tag[0] = 0;
 489
 490                 if ((link_tag_end) && (link_tag_end > link_tag_start)) {
 491                         int len;
 492                         len = link_tag_end - link_tag_start;
 493                         if (len > sizeof work_buffer) len = sizeof work_buffer;
 494                         memcpy(work_buffer, link_tag_start, len);
 495
 496                         char *rel_start = NULL;
 497                         char *rel_end = NULL;
 498                         rel_start = bmstrcasestr(work_buffer, "rel=");
 499                         if (rel_start) {
 500                                 rel_start = strchr(rel_start, '\"');
 501                                 if (rel_start) {
 502                                         ++rel_start;
 503                                         rel_end = strchr(rel_start, '\"');
 504                                         if ((rel_end) && (rel_end > rel_start)) {
 505                                                 safestrncpy(rel_tag, rel_start, rel_end - rel_start + 1);
 506                                         }
 507                                 }
 508                         }
 509
 510                         char *href_start = NULL;
 511                         char *href_end = NULL;
 512                         href_start = bmstrcasestr(work_buffer, "href=");
 513                         if (href_start) {
 514                                 href_start = strchr(href_start, '\"');
 515                                 if (href_start) {
 516                                         ++href_start;
 517                                         href_end = strchr(href_start, '\"');
 518                                         if ((href_end) && (href_end > href_start)) {
 519                                                 safestrncpy(href_tag, href_start, href_end - href_start + 1);
 520                                         }
 521                                 }
 522                         }
 523
 524                         if (!strcasecmp(rel, rel_tag)) {
 525                                 safestrncpy(target_buf, href_tag, target_size);
 526                                 return;
 527                         }
 528
 529                 }
 530
 531         ++ptr;
 532         }
 533
 534
 535 }
 536
 537
 538
 539 struct fh_data {
 540         char *buf;
 541         int total_bytes_received;
 542         int maxbytes;
 543 };
 544
 545
 546 size_t fh_callback(void *ptr, size_t size, size_t nmemb, void *stream)
 547 {
 548         struct fh_data *fh = (struct fh_data *) stream;
 549         int got_bytes = (size * nmemb);
 550
 551         if (fh->total_bytes_received + got_bytes > fh->maxbytes) {
 552                 got_bytes = fh->maxbytes - fh->total_bytes_received;
 553         }
 554         if (got_bytes > 0) {
 555                 memcpy(&fh->buf[fh->total_bytes_received], ptr, got_bytes);
 556                 fh->total_bytes_received += got_bytes;
 557         }
 558
 559         return (size * nmemb);  /* always succeed; libcurl doesn't need to know if we truncated it */
 560 }
 561
 562
 563
 564 /*
 565  * Begin an HTTP fetch (returns number of bytes actually fetched, or -1 for error) using libcurl.
 566  *
 567  * If 'normalize_len' is nonzero, the caller is specifying the buffer size of 'url', and is
 568  * requesting that the effective (normalized) URL be copied back to it.
 569  */
 570 int fetch_http(char *url, char *target_buf, int maxbytes, int normalize_len)
 571 {
 572         CURL *curl;
 573         CURLcode res;
 574         char errmsg[1024] = "";
 575         struct fh_data fh = {
 576                 target_buf,
 577                 0,
 578                 maxbytes
 579         };
 580         char *effective_url = NULL;
 581
 582         if (!url) return(-1);
 583         if (!target_buf) return(-1);
 584         memset(target_buf, 0, maxbytes);
 585
 586         curl = curl_easy_init();
 587         if (!curl) {
 588                 CtdlLogPrintf(CTDL_ALERT, "Unable to initialize libcurl.\n");
 589                 return(-1);
 590         }
 591
 592         curl_easy_setopt(curl, CURLOPT_URL, url);
 593         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 594         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 595         curl_easy_setopt(curl, CURLOPT_WRITEDATA, &fh);
 596         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fh_callback);
 597         curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
 598         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 599 #ifdef CURLOPT_HTTP_CONTENT_DECODING
 600         curl_easy_setopt(curl, CURLOPT_HTTP_CONTENT_DECODING, 1);
 601         curl_easy_setopt(curl, CURLOPT_ENCODING, "");
 602 #endif
 603         curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
 604         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 180);           /* die after 180 seconds */
 605         if (!IsEmptyStr(config.c_ip_addr)) {
 606                 curl_easy_setopt(curl, CURLOPT_INTERFACE, config.c_ip_addr);
 607         }
 608         res = curl_easy_perform(curl);
 609         if (res) {
 610                 CtdlLogPrintf(CTDL_DEBUG, "fetch_http() libcurl error %d: %s\n", res, errmsg);
 611         }
 612         if (normalize_len > 0) {
 613                 curl_easy_getinfo(curl, CURLINFO_EFFECTIVE_URL, &effective_url);
 614                 safestrncpy(url, effective_url, normalize_len);
 615         }
 616         curl_easy_cleanup(curl);
 617         return fh.total_bytes_received;
 618 }
 619
 620
 621 /*
 622  * Setup an OpenID authentication
 623  */
 624 void cmd_oids(char *argbuf) {
 625         char return_to[1024];
 626         char trust_root[1024];
 627         int i;
 628         char buf[SIZ];
 629         struct CitContext *CCC = CC;    /* CachedCitContext - performance boost */
 630         struct ctdl_openid *oiddata;
 631
 632         oiddata = (struct ctdl_openid *) CCC->openid_data;
 633
 634         if (oiddata != NULL) {
 635                 if (oiddata->sreg_keys != NULL) {
 636                         DeleteHash(&oiddata->sreg_keys);
 637                         oiddata->sreg_keys = NULL;
 638                 }
 639                 free(CCC->openid_data);
 640         }
 641         oiddata = malloc(sizeof(struct ctdl_openid));
 642         if (oiddata == NULL) {
 643                 cprintf("%d malloc failed\n", ERROR + INTERNAL_ERROR);
 644                 return;
 645         }
 646         memset(oiddata, 0, sizeof(struct ctdl_openid));
 647         CCC->openid_data = (void *) oiddata;
 648
 649         extract_token(oiddata->claimed_id, argbuf, 0, '|', sizeof oiddata->claimed_id);
 650         extract_token(return_to, argbuf, 1, '|', sizeof return_to);
 651         extract_token(trust_root, argbuf, 2, '|', sizeof trust_root);
 652         oiddata->verified = 0;
 653
 654         i = fetch_http(oiddata->claimed_id, buf, sizeof buf - 1, sizeof oiddata->claimed_id);
 655         CtdlLogPrintf(CTDL_DEBUG, "Normalized URL and Claimed ID is: %s\n", oiddata->claimed_id);
 656         buf[sizeof buf - 1] = 0;
 657         if (i > 0) {
 658                 char openid_delegate[1024];
 659
 660                 extract_link(oiddata->server, sizeof oiddata->server, "openid.server", buf);
 661                 extract_link(openid_delegate, sizeof openid_delegate, "openid.delegate", buf);
 662
 663                 if (IsEmptyStr(oiddata->server)) {
 664                         cprintf("%d There is no OpenID identity provider at this URL.\n", ERROR);
 665                         return;
 666                 }
 667
 668                 /* Empty delegate is legal; we just use the openid_url instead */
 669                 if (IsEmptyStr(openid_delegate)) {
 670                         safestrncpy(openid_delegate, oiddata->claimed_id, sizeof openid_delegate);
 671                 }
 672
 673                 /* Assemble a URL to which the user-agent will be redirected. */
 674                 char redirect_string[4096];
 675                 char escaped_identity[512];
 676                 char escaped_return_to[2048];
 677                 char escaped_trust_root[1024];
 678                 char escaped_sreg_optional[256];
 679
 680                 urlesc(escaped_identity, sizeof escaped_identity, openid_delegate);
 681                 urlesc(escaped_return_to, sizeof escaped_return_to, return_to);
 682                 urlesc(escaped_trust_root, sizeof escaped_trust_root, trust_root);
 683                 urlesc(escaped_sreg_optional, sizeof escaped_sreg_optional,
 684                         "nickname,email,fullname,postcode,country,dob,gender");
 685
 686                 snprintf(redirect_string, sizeof redirect_string,
 687                         "%s"
 688                         "?openid.mode=checkid_setup"
 689                         "&openid.identity=%s"
 690                         "&openid.return_to=%s"
 691                         "&openid.trust_root=%s"
 692                         "&openid.sreg.optional=%s"
 693                         ,
 694                         oiddata->server,
 695                         escaped_identity,
 696                         escaped_return_to,
 697                         escaped_trust_root,
 698                         escaped_sreg_optional
 699                 );
 700                 cprintf("%d %s\n", CIT_OK, redirect_string);
 701                 return;
 702         }
 703
 704         cprintf("%d Unable to fetch OpenID URL\n", ERROR);
 705 }
 706
 707
 708
 709
 710
 711 /*
 712  * Finalize an OpenID authentication
 713  */
 714 void cmd_oidf(char *argbuf) {
 715         char buf[2048];
 716         char thiskey[1024];
 717         char thisdata[1024];
 718         HashList *keys = NULL;
 719         struct ctdl_openid *oiddata = (struct ctdl_openid *) CC->openid_data;
 720
 721         keys = NewHash(1, NULL);
 722         if (!keys) {
 723                 cprintf("%d NewHash() failed\n", ERROR + INTERNAL_ERROR);
 724                 return;
 725         }
 726
 727         cprintf("%d Transmit OpenID data now\n", START_CHAT_MODE);
 728
 729         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 730                 extract_token(thiskey, buf, 0, '|', sizeof thiskey);
 731                 extract_token(thisdata, buf, 1, '|', sizeof thisdata);
 732                 CtdlLogPrintf(CTDL_DEBUG, "%s: [%d] %s\n", thiskey, strlen(thisdata), thisdata);
 733                 Put(keys, thiskey, strlen(thiskey), strdup(thisdata), generic_free_handler);
 734         }
 735
 736
 737         /* Now that we have all of the parameters, we have to validate the signature against the server */
 738         CtdlLogPrintf(CTDL_DEBUG, "About to validate the signature...\n");
 739
 740         CURL *curl;
 741         CURLcode res;
 742         struct curl_httppost *formpost = NULL;
 743         struct curl_httppost *lastptr = NULL;
 744         char errmsg[1024] = "";
 745         char *o_assoc_handle = NULL;
 746         char *o_sig = NULL;
 747         char *o_signed = NULL;
 748         int num_signed_values;
 749         int i;
 750         char k_keyname[128];
 751         char k_o_keyname[128];
 752         char *k_value = NULL;
 753         char valbuf[1024];
 754
 755         struct fh_data fh = {
 756                 valbuf,
 757                 0,
 758                 sizeof valbuf
 759         };
 760
 761         curl_formadd(&formpost, &lastptr,
 762                 CURLFORM_COPYNAME,      "openid.mode",
 763                 CURLFORM_COPYCONTENTS,  "check_authentication",
 764                 CURLFORM_END);
 765         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.mode", "check_authentication");
 766
 767         if (GetHash(keys, "assoc_handle", 12, (void *) &o_assoc_handle)) {
 768                 curl_formadd(&formpost, &lastptr,
 769                         CURLFORM_COPYNAME,      "openid.assoc_handle",
 770                         CURLFORM_COPYCONTENTS,  o_assoc_handle,
 771                         CURLFORM_END);
 772                 CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.assoc_handle", o_assoc_handle);
 773         }
 774
 775         if (GetHash(keys, "sig", 3, (void *) &o_sig)) {
 776                 curl_formadd(&formpost, &lastptr,
 777                         CURLFORM_COPYNAME,      "openid.sig",
 778                         CURLFORM_COPYCONTENTS,  o_sig,
 779                         CURLFORM_END);
 780                         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.sig", o_sig);
 781         }
 782
 783         if (GetHash(keys, "signed", 6, (void *) &o_signed)) {
 784                 curl_formadd(&formpost, &lastptr,
 785                         CURLFORM_COPYNAME,      "openid.signed",
 786                         CURLFORM_COPYCONTENTS,  o_signed,
 787                         CURLFORM_END);
 788                 CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.signed", o_signed);
 789
 790                 num_signed_values = num_tokens(o_signed, ',');
 791                 for (i=0; i<num_signed_values; ++i) {
 792                         extract_token(k_keyname, o_signed, i, ',', sizeof k_keyname);
 793                         if (strcasecmp(k_keyname, "mode")) {    // work around phpMyID bug
 794                                 if (GetHash(keys, k_keyname, strlen(k_keyname), (void *) &k_value)) {
 795                                         snprintf(k_o_keyname, sizeof k_o_keyname, "openid.%s", k_keyname);
 796                                         curl_formadd(&formpost, &lastptr,
 797                                                 CURLFORM_COPYNAME,      k_o_keyname,
 798                                                 CURLFORM_COPYCONTENTS,  k_value,
 799                                                 CURLFORM_END);
 800                                         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", k_o_keyname, k_value);
 801                                 }
 802                                 else {
 803                                         CtdlLogPrintf(CTDL_INFO, "OpenID: signed field '%s' is missing\n",
 804                                                 k_keyname);
 805                                 }
 806                         }
 807                 }
 808         }
 809
 810         curl = curl_easy_init();
 811         curl_easy_setopt(curl, CURLOPT_URL, oiddata->server);
 812         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 813         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 814         curl_easy_setopt(curl, CURLOPT_WRITEDATA, &fh);
 815         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fh_callback);
 816         curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 817         curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
 818         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 819 #ifdef CURLOPT_HTTP_CONTENT_DECODING
 820         curl_easy_setopt(curl, CURLOPT_HTTP_CONTENT_DECODING, 1);
 821         curl_easy_setopt(curl, CURLOPT_ENCODING, "");
 822 #endif
 823         curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
 824         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 180);           /* die after 180 seconds */
 825         if (!IsEmptyStr(config.c_ip_addr)) {
 826                 curl_easy_setopt(curl, CURLOPT_INTERFACE, config.c_ip_addr);
 827         }
 828
 829         res = curl_easy_perform(curl);
 830         if (res) {
 831                 CtdlLogPrintf(CTDL_DEBUG, "cmd_oidf() libcurl error %d: %s\n", res, errmsg);
 832         }
 833         curl_easy_cleanup(curl);
 834         curl_formfree(formpost);
 835
 836         valbuf[fh.total_bytes_received] = 0;
 837
 838         if (bmstrcasestr(valbuf, "is_valid:true")) {
 839                 oiddata->verified = 1;
 840         }
 841
 842         CtdlLogPrintf(CTDL_DEBUG, "Authentication %s.\n", (oiddata->verified ? "succeeded" : "failed") );
 843
 844         /* Respond to the client */
 845
 846         if (oiddata->verified) {
 847
 848                 /* If we were already logged in, attach the OpenID to the user's account */
 849                 if (CC->logged_in) {
 850                         if (attach_openid(&CC->user, oiddata->claimed_id) == 0) {
 851                                 cprintf("attach\n");
 852                                 CtdlLogPrintf(CTDL_DEBUG, "OpenID attach succeeded\n");
 853                         }
 854                         else {
 855                                 cprintf("fail\n");
 856                                 CtdlLogPrintf(CTDL_DEBUG, "OpenID attach failed\n");
 857                         }
 858                 }
 859
 860                 /* Otherwise, a user is attempting to log in using the verified OpenID */
 861                 else {
 862                         /*
 863                          * Existing user who has claimed this OpenID?
 864                          *
 865                          * Note: if you think that sending the password back over the wire is insecure,
 866                          * check your assumptions.  If someone has successfully asserted an OpenID that
 867                          * is associated with the account, they already have password equivalency and can
 868                          * login, so they could just as easily change the password, etc.
 869                          */
 870                         if (login_via_openid(oiddata->claimed_id) == 0) {
 871                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
 872                                 logged_in_response();
 873                                 CtdlLogPrintf(CTDL_DEBUG, "Logged in using previously claimed OpenID\n");
 874                         }
 875
 876                         /*
 877                          * If this system does not allow self-service new user registration, the
 878                          * remaining modes do not apply, so fail here and now.
 879                          */
 880                         else if (config.c_disable_newu) {
 881                                 cprintf("fail\n");
 882                                 CtdlLogPrintf(CTDL_DEBUG, "Creating user failed due to local policy\n");
 883                         }
 884
 885                         /*
 886                          * New user whose OpenID is verified and Simple Registration Extension is in use?
 887                          */
 888                         else if (openid_create_user_via_sreg(oiddata->claimed_id, keys) == 0) {
 889                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
 890                                 logged_in_response();
 891                                 CtdlLogPrintf(CTDL_DEBUG, "Successfully auto-created new user\n");
 892                         }
 893
 894                         /*
 895                          * OpenID is verified, but the desired username either was not specified or
 896                          * conflicts with an existing user.  Manual account creation is required.
 897                          */
 898                         else {
 899                                 char *desired_name = NULL;
 900                                 cprintf("verify_only\n");
 901                                 cprintf("%s\n", oiddata->claimed_id);
 902                                 if (GetHash(keys, "sreg.nickname", 13, (void *) &desired_name)) {
 903                                         cprintf("%s\n", desired_name);
 904                                 }
 905                                 else {
 906                                         cprintf("\n");
 907                                 }
 908                                 CtdlLogPrintf(CTDL_DEBUG, "The desired Simple Registration name is already taken.\n");
 909                         }
 910                 }
 911         }
 912         else {
 913                 cprintf("fail\n");
 914         }
 915         cprintf("000\n");
 916
 917         if (oiddata->sreg_keys != NULL) {
 918                 DeleteHash(&oiddata->sreg_keys);
 919                 oiddata->sreg_keys = NULL;
 920         }
 921         oiddata->sreg_keys = keys;
 922 }
 923
 924
 925
 926 /**************************************************************************/
 927 /*                                                                        */
 928 /* Functions in this section handle module initialization and shutdown    */
 929 /*                                                                        */
 930 /**************************************************************************/
 931
 932
 933 /*
 934  * This cleanup function blows away the temporary memory used by this module.
 935  */
 936 void openid_cleanup_function(void) {
 937         struct ctdl_openid *oiddata = (struct ctdl_openid *) CC->openid_data;
 938
 939         if (oiddata != NULL) {
 940                 CtdlLogPrintf(CTDL_DEBUG, "Clearing OpenID session state\n");
 941                 if (oiddata->sreg_keys != NULL) {
 942                         DeleteHash(&oiddata->sreg_keys);
 943                         oiddata->sreg_keys = NULL;
 944                 }
 945                 free(oiddata);
 946         }
 947 }
 948
 949
 950 CTDL_MODULE_INIT(openid_rp)
 951 {
 952         if (!threading) {
 953                 curl_global_init(CURL_GLOBAL_ALL);
 954
 955                 /* Only enable the OpenID command set when native mode authentication is in use. */
 956                 if (config.c_auth_mode == AUTHMODE_NATIVE) {
 957                         CtdlRegisterProtoHook(cmd_oids, "OIDS", "Setup OpenID authentication");
 958                         CtdlRegisterProtoHook(cmd_oidf, "OIDF", "Finalize OpenID authentication");
 959                         CtdlRegisterProtoHook(cmd_oidl, "OIDL", "List OpenIDs associated with an account");
 960                         CtdlRegisterProtoHook(cmd_oidd, "OIDD", "Detach an OpenID from an account");
 961                         CtdlRegisterProtoHook(cmd_oidc, "OIDC", "Create new user after validating OpenID");
 962                         CtdlRegisterProtoHook(cmd_oida, "OIDA", "List all OpenIDs in the database");
 963                 }
 964                 CtdlRegisterSessionHook(openid_cleanup_function, EVT_LOGOUT);
 965                 CtdlRegisterUserHook(openid_purge, EVT_PURGEUSER);
 966         }
 967
 968         /* return our Subversion id for the Log */
 969         return "$Id$";
 970 }