citadel/modules/openid/serv_openid_rp.c

   1 /*
   2  * $Id$
   3  *
   4  * This is an implementation of OpenID 1.1 Relying Party support, in stateless mode.
   5  *
   6  */
   7
   8 #include "sysdep.h"
   9 #include <stdlib.h>
  10 #include <unistd.h>
  11 #include <stdio.h>
  12 #include <fcntl.h>
  13 #include <signal.h>
  14 #include <pwd.h>
  15 #include <errno.h>
  16 #include <sys/types.h>
  17
  18 #if TIME_WITH_SYS_TIME
  19 # include <sys/time.h>
  20 # include <time.h>
  21 #else
  22 # if HAVE_SYS_TIME_H
  23 #  include <sys/time.h>
  24 # else
  25 #  include <time.h>
  26 # endif
  27 #endif
  28
  29 #include <sys/wait.h>
  30 #include <string.h>
  31 #include <limits.h>
  32 #include <curl/curl.h>
  33 #include "ctdl_module.h"
  34 #include "config.h"
  35 #include "citserver.h"
  36 #include "user_ops.h"
  37
  38 struct ctdl_openid {
  39         char claimed_id[1024];
  40         char server[1024];
  41         int verified;
  42 };
  43
  44
  45
  46
  47
  48 /**************************************************************************/
  49 /*                                                                        */
  50 /* Functions in this section handle Citadel internal OpenID mapping stuff */
  51 /*                                                                        */
  52 /**************************************************************************/
  53
  54
  55 /*
  56  * The structure of an openid record *key* is:
  57  *
  58  * |--------------claimed_id-------------|
  59  *     (actual length of claimed id)
  60  *
  61  *
  62  * The structure of an openid record *value* is:
  63  *
  64  * |-----user_number----|------------claimed_id---------------|
  65  *    (sizeof long)          (actual length of claimed id)
  66  *
  67  */
  68
  69
  70
  71 /*
  72  * Attach an OpenID to a Citadel account
  73  */
  74 int attach_openid(struct ctdluser *who, char *claimed_id)
  75 {
  76         struct cdbdata *cdboi;
  77         long fetched_usernum;
  78         char *data;
  79         int data_len;
  80
  81         if (!who) return(1);
  82         if (!claimed_id) return(1);
  83         if (IsEmptyStr(claimed_id)) return(1);
  84
  85         /* Check to see if this OpenID is already in the database */
  86
  87         cdboi = cdb_fetch(CDB_OPENID, claimed_id, strlen(claimed_id));
  88         if (cdboi != NULL) {
  89                 memcpy(&fetched_usernum, cdboi->ptr, sizeof(long));
  90                 cdb_free(cdboi);
  91
  92                 if (fetched_usernum == who->usernum) {
  93                         CtdlLogPrintf(CTDL_INFO, "%s already associated; no action is taken\n", claimed_id);
  94                         return(0);
  95                 }
  96                 else {
  97                         CtdlLogPrintf(CTDL_INFO, "%s already belongs to another user\n", claimed_id);
  98                         return(3);
  99                 }
 100         }
 101
 102         /* Not already in the database, so attach it now */
 103
 104         data_len = sizeof(long) + strlen(claimed_id) + 1;
 105         data = malloc(data_len);
 106
 107         memcpy(data, &who->usernum, sizeof(long));
 108         memcpy(&data[sizeof(long)], claimed_id, strlen(claimed_id) + 1);
 109
 110         cdb_store(CDB_OPENID, claimed_id, strlen(claimed_id), data, data_len);
 111         free(data);
 112
 113         CtdlLogPrintf(CTDL_INFO, "%s has been attached to %s (%ld)\n",
 114                 claimed_id, who->fullname, who->usernum);
 115         return(0);
 116 }
 117
 118
 119
 120 /*
 121  * When a user is being deleted, we have to delete any OpenID associations
 122  */
 123 void openid_purge(struct ctdluser *usbuf) {
 124         struct cdbdata *cdboi;
 125         HashList *keys = NULL;
 126         HashPos *HashPos;
 127         char *deleteme = NULL;
 128         long len;
 129         void *Value;
 130         char *Key;
 131
 132         keys = NewHash(1, NULL);
 133         if (!keys) return;
 134
 135
 136         cdb_rewind(CDB_OPENID);
 137         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 138                 if (cdboi->len > sizeof(long)) {
 139                         if (((long)*(cdboi->ptr)) == usbuf->usernum) {
 140                                 deleteme = strdup(cdboi->ptr + sizeof(long)),
 141                                 Put(keys, deleteme, strlen(deleteme), deleteme, generic_free_handler);
 142                         }
 143                 }
 144                 cdb_free(cdboi);
 145         }
 146
 147         /* Go through the hash list, deleting keys we stored in it */
 148
 149         HashPos = GetNewHashPos();
 150         while (GetNextHashPos(keys, HashPos, &len, &Key, &Value)!=0)
 151         {
 152                 CtdlLogPrintf(CTDL_DEBUG, "Deleting associated OpenID <%s>\n", Value);
 153                 cdb_delete(CDB_OPENID, Value, strlen(Value));
 154                 /* note: don't free(Value) -- deleting the hash list will handle this for us */
 155         }
 156         DeleteHashPos(&HashPos);
 157         DeleteHash(&keys);
 158 }
 159
 160
 161
 162 /*
 163  * List the OpenIDs associated with the currently logged in account
 164  */
 165 void cmd_oidl(char *argbuf) {
 166         struct cdbdata *cdboi;
 167
 168         if (CtdlAccessCheck(ac_logged_in)) return;
 169         cdb_rewind(CDB_OPENID);
 170         cprintf("%d Associated OpenIDs:\n", LISTING_FOLLOWS);
 171
 172         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 173                 if (cdboi->len > sizeof(long)) {
 174                         if (((long)*(cdboi->ptr)) == CC->user.usernum) {
 175                                 cprintf("%s\n", cdboi->ptr + sizeof(long));
 176                         }
 177                 }
 178                 cdb_free(cdboi);
 179         }
 180         cprintf("000\n");
 181 }
 182
 183
 184 /*
 185  * Create a new user account, manually specifying the name, after successfully
 186  * verifying an OpenID (which will of course be attached to the account)
 187  */
 188 void cmd_oidc(char *argbuf) {
 189         struct ctdl_openid *oiddata = (struct ctdl_openid *) CC->openid_data;
 190
 191         if (!oiddata->verified) {
 192                 cprintf("%d You have not verified an OpenID yet.\n", ERROR);
 193                 return;
 194         }
 195
 196         /* We can make the semantics of OIDC exactly the same as NEWU, simply
 197          * by _calling_ cmd_newu() and letting it run.  Very clever!
 198          */
 199         cmd_newu(argbuf);
 200
 201         /* Now, if this logged us in, we have to attach the OpenID */
 202         if (CC->logged_in) {
 203                 attach_openid(&CC->user, oiddata->claimed_id);
 204                 /* populate_vcard_from_sreg(FIXME GET THE SREG DATA IN HERE SOMEHOW); */
 205         }
 206
 207 }
 208
 209
 210
 211
 212 /*
 213  * Detach an OpenID from the currently logged in account
 214  */
 215 void cmd_oidd(char *argbuf) {
 216         struct cdbdata *cdboi;
 217         char id_to_detach[1024];
 218         int this_is_mine = 0;
 219
 220         if (CtdlAccessCheck(ac_logged_in)) return;
 221         extract_token(id_to_detach, argbuf, 0, '|', sizeof id_to_detach);
 222         if (IsEmptyStr(id_to_detach)) {
 223                 cprintf("%d An empty OpenID URL is not allowed.\n", ERROR + ILLEGAL_VALUE);
 224         }
 225
 226         cdb_rewind(CDB_OPENID);
 227         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 228                 if (cdboi->len > sizeof(long)) {
 229                         if (((long)*(cdboi->ptr)) == CC->user.usernum) {
 230                                 this_is_mine = 1;
 231                         }
 232                 }
 233                 cdb_free(cdboi);
 234         }
 235
 236         if (!this_is_mine) {
 237                 cprintf("%d That OpenID was not found or not associated with your account.\n",
 238                         ERROR + ILLEGAL_VALUE);
 239                 return;
 240         }
 241
 242         cdb_delete(CDB_OPENID, id_to_detach, strlen(id_to_detach));
 243         cprintf("%d %s detached from your account.\n", CIT_OK, id_to_detach);
 244 }
 245
 246
 247
 248 /*
 249  * Attempt to register (populate the vCard) the currently-logged-in user
 250  * using the data from Simple Registration Extension, if present.
 251  */
 252 void populate_vcard_from_sreg(HashList *sreg_keys) {
 253
 254         struct vCard *v;
 255         int pop = 0;                    /* number of fields populated */
 256         char *data = NULL;
 257         char *postcode = NULL;
 258         char *country = NULL;
 259
 260         if (!sreg_keys) return;
 261         v = vcard_new();
 262         if (!v) return;
 263
 264         if (GetHash(sreg_keys, "identity", 8, (void *) &data)) {
 265                 vcard_add_prop(v, "url;type=openid", data);
 266                 ++pop;
 267         }
 268
 269         if (GetHash(sreg_keys, "sreg.email", 10, (void *) &data)) {
 270                 vcard_add_prop(v, "email;internet", data);
 271                 ++pop;
 272         }
 273
 274         if (GetHash(sreg_keys, "sreg.nickname", 13, (void *) &data)) {
 275                 vcard_add_prop(v, "nickname", data);
 276                 ++pop;
 277         }
 278
 279         if (GetHash(sreg_keys, "sreg.fullname", 13, (void *) &data)) {
 280                 char n[256];
 281                 vcard_add_prop(v, "fn", data);
 282                 vcard_fn_to_n(n, data, sizeof n);
 283                 vcard_add_prop(v, "n", n);
 284                 ++pop;
 285         }
 286
 287         if (!GetHash(sreg_keys, "sreg.postcode", 13, (void *) &postcode)) {
 288                 postcode = NULL;
 289         }
 290
 291         if (!GetHash(sreg_keys, "sreg.country", 12, (void *) &country)) {
 292                 country = NULL;
 293         }
 294
 295         if (postcode || country) {
 296                 char adr[256];
 297                 snprintf(adr, sizeof adr, ";;;;;%s;%s",
 298                         (postcode ? postcode : ""),
 299                         (country ? country : "")
 300                 );
 301                 vcard_add_prop(v, "adr", adr);
 302                 ++pop;
 303         }
 304
 305         if (GetHash(sreg_keys, "sreg.dob", 8, (void *) &data)) {
 306                 vcard_add_prop(v, "bday", data);
 307                 ++pop;
 308         }
 309
 310         if (GetHash(sreg_keys, "sreg.gender", 11, (void *) &data)) {
 311                 vcard_add_prop(v, "x-funambol-gender", data);
 312                 ++pop;
 313         }
 314
 315         /* Only save the vCard if there is some useful data in it */
 316         if (pop > 0) {
 317                 char temp[PATH_MAX];
 318                 FILE *fp;
 319                 char *ser;
 320
 321                 CtdlMakeTempFileName(temp, sizeof temp);
 322                 ser = vcard_serialize(v);
 323                 if (ser) {
 324                         CtdlLogPrintf(CTDL_DEBUG, "--- BEGIN VCARD ---\n%s\n--- END VCARD ---\n", ser);
 325                         fp = fopen(temp, "w");
 326                         if (fp) {
 327                                 fwrite(ser, strlen(ser), 1, fp);
 328                                 fclose(fp);
 329                                 CtdlWriteObject(USERCONFIGROOM, "text/x-vcard", temp, &CC->user, 0, 0, 0);
 330                                 unlink(temp);
 331                         }
 332                         free(ser);
 333                 }
 334         }
 335         vcard_free(v);
 336 }
 337
 338
 339 /*
 340  * Attempt to auto-create a new Citadel account using the nickname from Simple Registration Extension
 341  */
 342 int openid_create_user_via_sreg(char *claimed_id, HashList *sreg_keys)
 343 {
 344         char *desired_name = NULL;
 345         char new_password[32];
 346
 347         if (config.c_auth_mode != AUTHMODE_NATIVE) return(1);
 348         if (config.c_disable_newu) return(2);
 349         if (CC->logged_in) return(3);
 350         if (!GetHash(sreg_keys, "sreg.nickname", 13, (void *) &desired_name)) return(4);
 351
 352         CtdlLogPrintf(CTDL_DEBUG, "The desired account name is <%s>\n", desired_name);
 353
 354         if (!getuser(&CC->user, desired_name)) {
 355                 CtdlLogPrintf(CTDL_DEBUG, "<%s> is already taken by another user.\n", desired_name);
 356                 memset(&CC->user, 0, sizeof(struct ctdluser));
 357                 return(5);
 358         }
 359
 360         /* The desired account name is available.  Create the account and log it in! */
 361         if (create_user(desired_name, 1)) return(6);
 362
 363         snprintf(new_password, sizeof new_password, "%08lx%08lx", random(), random());
 364         CtdlSetPassword(new_password);
 365         attach_openid(&CC->user, claimed_id);
 366         populate_vcard_from_sreg(sreg_keys);
 367         return(0);
 368 }
 369
 370
 371 /*
 372  * If a user account exists which is associated with the Claimed ID, log it in and return zero.
 373  * Otherwise it returns nonzero.
 374  */
 375 int login_via_openid(char *claimed_id)
 376 {
 377         struct cdbdata *cdboi;
 378         long usernum = 0;
 379
 380         cdboi = cdb_fetch(CDB_OPENID, claimed_id, strlen(claimed_id));
 381         if (cdboi == NULL) {
 382                 return(-1);
 383         }
 384
 385         memcpy(&usernum, cdboi->ptr, sizeof(long));
 386         cdb_free(cdboi);
 387
 388         if (!getuserbynumber(&CC->user, usernum)) {
 389                 /* Now become the user we just created */
 390                 safestrncpy(CC->curr_user, CC->user.fullname, sizeof CC->curr_user);
 391                 do_login();
 392                 return(0);
 393         }
 394         else {
 395                 memset(&CC->user, 0, sizeof(struct ctdluser));
 396                 return(-1);
 397         }
 398 }
 399
 400
 401
 402
 403 /**************************************************************************/
 404 /*                                                                        */
 405 /* Functions in this section handle OpenID protocol                       */
 406 /*                                                                        */
 407 /**************************************************************************/
 408
 409
 410 /*
 411  * Locate a <link> tag and, given its 'rel=' parameter, return its 'href' parameter
 412  */
 413 void extract_link(char *target_buf, int target_size, char *rel, char *source_buf)
 414 {
 415         char *ptr = source_buf;
 416
 417         if (!target_buf) return;
 418         if (!rel) return;
 419         if (!source_buf) return;
 420
 421         target_buf[0] = 0;
 422
 423         while (ptr = bmstrcasestr(ptr, "<link"), ptr != NULL) {
 424
 425                 char work_buffer[2048];
 426                 char *link_tag_start = NULL;
 427                 char *link_tag_end = NULL;
 428
 429                 char rel_tag[2048];
 430                 char href_tag[2048];
 431
 432                 link_tag_start = ptr;
 433                 link_tag_end = strchr(ptr, '>');
 434                 rel_tag[0] = 0;
 435                 href_tag[0] = 0;
 436
 437                 if ((link_tag_end) && (link_tag_end > link_tag_start)) {
 438                         int len;
 439                         len = link_tag_end - link_tag_start;
 440                         if (len > sizeof work_buffer) len = sizeof work_buffer;
 441                         memcpy(work_buffer, link_tag_start, len);
 442
 443                         char *rel_start = NULL;
 444                         char *rel_end = NULL;
 445                         rel_start = bmstrcasestr(work_buffer, "rel=");
 446                         if (rel_start) {
 447                                 rel_start = strchr(rel_start, '\"');
 448                                 if (rel_start) {
 449                                         ++rel_start;
 450                                         rel_end = strchr(rel_start, '\"');
 451                                         if ((rel_end) && (rel_end > rel_start)) {
 452                                                 safestrncpy(rel_tag, rel_start, rel_end - rel_start + 1);
 453                                         }
 454                                 }
 455                         }
 456
 457                         char *href_start = NULL;
 458                         char *href_end = NULL;
 459                         href_start = bmstrcasestr(work_buffer, "href=");
 460                         if (href_start) {
 461                                 href_start = strchr(href_start, '\"');
 462                                 if (href_start) {
 463                                         ++href_start;
 464                                         href_end = strchr(href_start, '\"');
 465                                         if ((href_end) && (href_end > href_start)) {
 466                                                 safestrncpy(href_tag, href_start, href_end - href_start + 1);
 467                                         }
 468                                 }
 469                         }
 470
 471                         if (!strcasecmp(rel, rel_tag)) {
 472                                 safestrncpy(target_buf, href_tag, target_size);
 473                                 return;
 474                         }
 475
 476                 }
 477
 478         ++ptr;
 479         }
 480
 481
 482 }
 483
 484
 485
 486 struct fh_data {
 487         char *buf;
 488         int total_bytes_received;
 489         int maxbytes;
 490 };
 491
 492
 493 size_t fh_callback(void *ptr, size_t size, size_t nmemb, void *stream)
 494 {
 495         struct fh_data *fh = (struct fh_data *) stream;
 496         int got_bytes = (size * nmemb);
 497
 498         if (fh->total_bytes_received + got_bytes > fh->maxbytes) {
 499                 got_bytes = fh->maxbytes - fh->total_bytes_received;
 500         }
 501         if (got_bytes > 0) {
 502                 memcpy(&fh->buf[fh->total_bytes_received], ptr, got_bytes);
 503                 fh->total_bytes_received += got_bytes;
 504         }
 505
 506         return (size * nmemb);  /* always succeed; libcurl doesn't need to know if we truncated it */
 507 }
 508
 509
 510
 511 /*
 512  * Begin an HTTP fetch (returns number of bytes actually fetched, or -1 for error) using libcurl.
 513  *
 514  * If 'normalize_len' is nonzero, the caller is specifying the buffer size of 'url', and is
 515  * requesting that the effective (normalized) URL be copied back to it.
 516  */
 517 int fetch_http(char *url, char *target_buf, int maxbytes, int normalize_len)
 518 {
 519         CURL *curl;
 520         CURLcode res;
 521         char errmsg[1024] = "";
 522         struct fh_data fh = {
 523                 target_buf,
 524                 0,
 525                 maxbytes
 526         };
 527         char *effective_url = NULL;
 528
 529         if (!url) return(-1);
 530         if (!target_buf) return(-1);
 531         memset(target_buf, 0, maxbytes);
 532
 533         curl = curl_easy_init();
 534         if (!curl) {
 535                 CtdlLogPrintf(CTDL_ALERT, "Unable to initialize libcurl.\n");
 536                 return(-1);
 537         }
 538
 539         curl_easy_setopt(curl, CURLOPT_URL, url);
 540         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 541         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 542         curl_easy_setopt(curl, CURLOPT_WRITEDATA, &fh);
 543         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fh_callback);
 544         curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
 545         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 546         curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
 547         if (!IsEmptyStr(config.c_ip_addr)) {
 548                 curl_easy_setopt(curl, CURLOPT_INTERFACE, config.c_ip_addr);
 549         }
 550         res = curl_easy_perform(curl);
 551         if (res) {
 552                 CtdlLogPrintf(CTDL_DEBUG, "fetch_http() libcurl error %d: %s\n", res, errmsg);
 553         }
 554         if (normalize_len > 0) {
 555                 curl_easy_getinfo(curl, CURLINFO_EFFECTIVE_URL, &effective_url);
 556                 safestrncpy(url, effective_url, normalize_len);
 557         }
 558         curl_easy_cleanup(curl);
 559         return fh.total_bytes_received;
 560 }
 561
 562
 563 /*
 564  * Setup an OpenID authentication
 565  */
 566 void cmd_oids(char *argbuf) {
 567         char return_to[1024];
 568         char trust_root[1024];
 569         int i;
 570         char buf[SIZ];
 571         struct CitContext *CCC = CC;    /* CachedCitContext - performance boost */
 572         struct ctdl_openid *oiddata;
 573
 574         /* commented out because we may be attempting to attach an OpenID to
 575          * an existing account that is logged in
 576          *
 577         if (CCC->logged_in) {
 578                 cprintf("%d Already logged in.\n", ERROR + ALREADY_LOGGED_IN);
 579                 return;
 580         }
 581          */
 582
 583         if (CCC->openid_data != NULL) {
 584                 free(CCC->openid_data);
 585         }
 586         oiddata = malloc(sizeof(struct ctdl_openid));
 587         if (oiddata == NULL) {
 588                 cprintf("%d malloc failed\n", ERROR + INTERNAL_ERROR);
 589                 return;
 590         }
 591         memset(oiddata, 0, sizeof(struct ctdl_openid));
 592         CCC->openid_data = (void *) oiddata;
 593
 594         extract_token(oiddata->claimed_id, argbuf, 0, '|', sizeof oiddata->claimed_id);
 595         extract_token(return_to, argbuf, 1, '|', sizeof return_to);
 596         extract_token(trust_root, argbuf, 2, '|', sizeof trust_root);
 597         oiddata->verified = 0;
 598
 599         i = fetch_http(oiddata->claimed_id, buf, sizeof buf - 1, sizeof oiddata->claimed_id);
 600         CtdlLogPrintf(CTDL_DEBUG, "Normalized URL and Claimed ID is: %s\n", oiddata->claimed_id);
 601         buf[sizeof buf - 1] = 0;
 602         if (i > 0) {
 603                 char openid_delegate[1024];
 604
 605                 extract_link(oiddata->server, sizeof oiddata->server, "openid.server", buf);
 606                 extract_link(openid_delegate, sizeof openid_delegate, "openid.delegate", buf);
 607
 608                 if (IsEmptyStr(oiddata->server)) {
 609                         cprintf("%d There is no OpenID identity provider at this URL.\n", ERROR);
 610                         return;
 611                 }
 612
 613                 /* Empty delegate is legal; we just use the openid_url instead */
 614                 if (IsEmptyStr(openid_delegate)) {
 615                         safestrncpy(openid_delegate, oiddata->claimed_id, sizeof openid_delegate);
 616                 }
 617
 618                 /* Assemble a URL to which the user-agent will be redirected. */
 619                 char redirect_string[4096];
 620                 char escaped_identity[512];
 621                 char escaped_return_to[2048];
 622                 char escaped_trust_root[1024];
 623                 char escaped_sreg_optional[256];
 624
 625                 urlesc(escaped_identity, sizeof escaped_identity, openid_delegate);
 626                 urlesc(escaped_return_to, sizeof escaped_return_to, return_to);
 627                 urlesc(escaped_trust_root, sizeof escaped_trust_root, trust_root);
 628                 urlesc(escaped_sreg_optional, sizeof escaped_sreg_optional,
 629                         "nickname,email,fullname,postcode,country,dob,gender");
 630
 631                 snprintf(redirect_string, sizeof redirect_string,
 632                         "%s"
 633                         "?openid.mode=checkid_setup"
 634                         "&openid.identity=%s"
 635                         "&openid.return_to=%s"
 636                         "&openid.trust_root=%s"
 637                         "&openid.sreg.optional=%s"
 638                         ,
 639                         oiddata->server,
 640                         escaped_identity,
 641                         escaped_return_to,
 642                         escaped_trust_root,
 643                         escaped_sreg_optional
 644                 );
 645                 cprintf("%d %s\n", CIT_OK, redirect_string);
 646                 return;
 647         }
 648
 649         cprintf("%d Unable to fetch OpenID URL\n", ERROR);
 650 }
 651
 652
 653
 654
 655
 656 /*
 657  * Finalize an OpenID authentication
 658  */
 659 void cmd_oidf(char *argbuf) {
 660         char buf[2048];
 661         char thiskey[1024];
 662         char thisdata[1024];
 663         HashList *keys = NULL;
 664         struct ctdl_openid *oiddata = (struct ctdl_openid *) CC->openid_data;
 665
 666         keys = NewHash(1, NULL);
 667         if (!keys) {
 668                 cprintf("%d NewHash() failed\n", ERROR + INTERNAL_ERROR);
 669                 return;
 670         }
 671
 672         cprintf("%d Transmit OpenID data now\n", START_CHAT_MODE);
 673
 674         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 675                 extract_token(thiskey, buf, 0, '|', sizeof thiskey);
 676                 extract_token(thisdata, buf, 1, '|', sizeof thisdata);
 677                 CtdlLogPrintf(CTDL_DEBUG, "%s: [%d] %s\n", thiskey, strlen(thisdata), thisdata);
 678                 Put(keys, thiskey, strlen(thiskey), strdup(thisdata), generic_free_handler);
 679         }
 680
 681
 682         /* Now that we have all of the parameters, we have to validate the signature against the server */
 683         CtdlLogPrintf(CTDL_DEBUG, "About to validate the signature...\n");
 684
 685         CURL *curl;
 686         CURLcode res;
 687         struct curl_httppost *formpost = NULL;
 688         struct curl_httppost *lastptr = NULL;
 689         char errmsg[1024] = "";
 690         char *o_assoc_handle = NULL;
 691         char *o_sig = NULL;
 692         char *o_signed = NULL;
 693         int num_signed_values;
 694         int i;
 695         char k_keyname[128];
 696         char k_o_keyname[128];
 697         char *k_value = NULL;
 698         char valbuf[1024];
 699
 700         struct fh_data fh = {
 701                 valbuf,
 702                 0,
 703                 sizeof valbuf
 704         };
 705
 706         curl_formadd(&formpost, &lastptr,
 707                 CURLFORM_COPYNAME,      "openid.mode",
 708                 CURLFORM_COPYCONTENTS,  "check_authentication",
 709                 CURLFORM_END);
 710         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.mode", "check_authentication");
 711
 712         if (GetHash(keys, "assoc_handle", 12, (void *) &o_assoc_handle)) {
 713                 curl_formadd(&formpost, &lastptr,
 714                         CURLFORM_COPYNAME,      "openid.assoc_handle",
 715                         CURLFORM_COPYCONTENTS,  o_assoc_handle,
 716                         CURLFORM_END);
 717                 CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.assoc_handle", o_assoc_handle);
 718         }
 719
 720         if (GetHash(keys, "sig", 3, (void *) &o_sig)) {
 721                 curl_formadd(&formpost, &lastptr,
 722                         CURLFORM_COPYNAME,      "openid.sig",
 723                         CURLFORM_COPYCONTENTS,  o_sig,
 724                         CURLFORM_END);
 725                         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.sig", o_sig);
 726         }
 727
 728         if (GetHash(keys, "signed", 6, (void *) &o_signed)) {
 729                 curl_formadd(&formpost, &lastptr,
 730                         CURLFORM_COPYNAME,      "openid.signed",
 731                         CURLFORM_COPYCONTENTS,  o_signed,
 732                         CURLFORM_END);
 733                 CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.signed", o_signed);
 734
 735                 num_signed_values = num_tokens(o_signed, ',');
 736                 for (i=0; i<num_signed_values; ++i) {
 737                         extract_token(k_keyname, o_signed, i, ',', sizeof k_keyname);
 738                         if (strcasecmp(k_keyname, "mode")) {    // work around phpMyID bug
 739                                 if (GetHash(keys, k_keyname, strlen(k_keyname), (void *) &k_value)) {
 740                                         snprintf(k_o_keyname, sizeof k_o_keyname, "openid.%s", k_keyname);
 741                                         curl_formadd(&formpost, &lastptr,
 742                                                 CURLFORM_COPYNAME,      k_o_keyname,
 743                                                 CURLFORM_COPYCONTENTS,  k_value,
 744                                                 CURLFORM_END);
 745                                         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", k_o_keyname, k_value);
 746                                 }
 747                                 else {
 748                                         CtdlLogPrintf(CTDL_INFO, "OpenID: signed field '%s' is missing\n",
 749                                                 k_keyname);
 750                                 }
 751                         }
 752                 }
 753         }
 754
 755         curl = curl_easy_init();
 756         curl_easy_setopt(curl, CURLOPT_URL, oiddata->server);
 757         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 758         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 759         curl_easy_setopt(curl, CURLOPT_WRITEDATA, &fh);
 760         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fh_callback);
 761         curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 762         curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
 763         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 764         curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
 765         if (!IsEmptyStr(config.c_ip_addr)) {
 766                 curl_easy_setopt(curl, CURLOPT_INTERFACE, config.c_ip_addr);
 767         }
 768
 769         res = curl_easy_perform(curl);
 770         if (res) {
 771                 CtdlLogPrintf(CTDL_DEBUG, "cmd_oidf() libcurl error %d: %s\n", res, errmsg);
 772         }
 773         curl_easy_cleanup(curl);
 774         curl_formfree(formpost);
 775
 776         valbuf[fh.total_bytes_received] = 0;
 777
 778         if (bmstrcasestr(valbuf, "is_valid:true")) {
 779                 oiddata->verified = 1;
 780         }
 781
 782         CtdlLogPrintf(CTDL_DEBUG, "Authentication %s.\n", (oiddata->verified ? "succeeded" : "failed") );
 783
 784         /* Respond to the client */
 785
 786         if (oiddata->verified) {
 787
 788                 /* If we were already logged in, attach the OpenID to the user's account */
 789                 if (CC->logged_in) {
 790                         if (attach_openid(&CC->user, oiddata->claimed_id) == 0) {
 791                                 cprintf("attach\n");
 792                         }
 793                         else {
 794                                 cprintf("fail\n");
 795                         }
 796                 }
 797
 798                 /* Otherwise, a user is attempting to log in using the verified OpenID */
 799                 else {
 800                         /*
 801                          * Existing user who has claimed this OpenID?
 802                          *
 803                          * Note: if you think that sending the password back over the wire is insecure,
 804                          * check your assumptions.  If someone has successfully asserted an OpenID that
 805                          * is associated with the account, they already have password equivalency and can
 806                          * login, so they could just as easily change the password, etc.
 807                          */
 808                         if (login_via_openid(oiddata->claimed_id) == 0) {
 809                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
 810                                 logged_in_response();
 811                         }
 812
 813                         /*
 814                          * New user whose OpenID is verified and Simple Registration Extension is in use?
 815                          */
 816                         else if (openid_create_user_via_sreg(oiddata->claimed_id, keys) == 0) {
 817                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
 818                                 logged_in_response();
 819                         }
 820
 821                         /*
 822                          * OpenID is verified, but the desired username either was not specified or
 823                          * conflicts with an existing user.  Manual account creation is required.
 824                          */
 825                         else {
 826                                 char *desired_name = NULL;
 827                                 cprintf("verify_only\n");
 828                                 cprintf("%s\n", oiddata->claimed_id);
 829                                 if (GetHash(keys, "sreg.nickname", 13, (void *) &desired_name)) {
 830                                         cprintf("%s\n", desired_name);
 831                                 }
 832                                 else {
 833                                         cprintf("\n");
 834                                 }
 835                         }
 836                 }
 837         }
 838         else {
 839                 cprintf("fail\n");
 840         }
 841         cprintf("000\n");
 842
 843         DeleteHash(&keys);              /* This will free() all the key data for us */
 844 }
 845
 846
 847
 848 /**************************************************************************/
 849 /*                                                                        */
 850 /* Functions in this section handle module initialization and shutdown    */
 851 /*                                                                        */
 852 /**************************************************************************/
 853
 854
 855 /*
 856  * This cleanup function blows away the temporary memory used by this module.
 857  */
 858 void openid_cleanup_function(void) {
 859
 860         if (CC->openid_data != NULL) {
 861                 CtdlLogPrintf(CTDL_DEBUG, "Clearing OpenID session state\n");
 862                 free(CC->openid_data);
 863         }
 864 }
 865
 866
 867 CTDL_MODULE_INIT(openid_rp)
 868 {
 869         if (!threading)
 870         {
 871                 curl_global_init(CURL_GLOBAL_ALL);
 872                 CtdlRegisterProtoHook(cmd_oids, "OIDS", "Setup OpenID authentication");
 873                 CtdlRegisterProtoHook(cmd_oidf, "OIDF", "Finalize OpenID authentication");
 874                 CtdlRegisterProtoHook(cmd_oidl, "OIDL", "List OpenIDs associated with an account");
 875                 CtdlRegisterProtoHook(cmd_oidd, "OIDD", "Detach an OpenID from an account");
 876                 CtdlRegisterProtoHook(cmd_oidc, "OIDC", "Create a new user after validating an OpenID");
 877                 CtdlRegisterSessionHook(openid_cleanup_function, EVT_LOGOUT);
 878                 CtdlRegisterUserHook(openid_purge, EVT_PURGEUSER);
 879         }
 880
 881         /* return our Subversion id for the Log */
 882         return "$Id$";
 883 }