citadel/modules/openid/serv_openid_rp.c

   1 /*
   2  * $Id$
   3  *
   4  * This is an implementation of OpenID 1.1 Relying Party support, in stateless mode.
   5  *
   6  */
   7
   8 #include "sysdep.h"
   9 #include <stdlib.h>
  10 #include <unistd.h>
  11 #include <stdio.h>
  12 #include <fcntl.h>
  13 #include <signal.h>
  14 #include <pwd.h>
  15 #include <errno.h>
  16 #include <sys/types.h>
  17
  18 #if TIME_WITH_SYS_TIME
  19 # include <sys/time.h>
  20 # include <time.h>
  21 #else
  22 # if HAVE_SYS_TIME_H
  23 #  include <sys/time.h>
  24 # else
  25 #  include <time.h>
  26 # endif
  27 #endif
  28
  29 #include <sys/wait.h>
  30 #include <string.h>
  31 #include <limits.h>
  32 #include <curl/curl.h>
  33 #include "ctdl_module.h"
  34 #include "config.h"
  35 #include "citserver.h"
  36 #include "user_ops.h"
  37
  38 struct ctdl_openid {
  39         char claimed_id[1024];
  40         char server[1024];
  41         int verified;
  42         HashList *sreg_keys;
  43 };
  44
  45
  46
  47
  48
  49 /**************************************************************************/
  50 /*                                                                        */
  51 /* Functions in this section handle Citadel internal OpenID mapping stuff */
  52 /*                                                                        */
  53 /**************************************************************************/
  54
  55
  56 /*
  57  * The structure of an openid record *key* is:
  58  *
  59  * |--------------claimed_id-------------|
  60  *     (actual length of claimed id)
  61  *
  62  *
  63  * The structure of an openid record *value* is:
  64  *
  65  * |-----user_number----|------------claimed_id---------------|
  66  *    (sizeof long)          (actual length of claimed id)
  67  *
  68  */
  69
  70
  71
  72 /*
  73  * Attach an OpenID to a Citadel account
  74  */
  75 int attach_openid(struct ctdluser *who, char *claimed_id)
  76 {
  77         struct cdbdata *cdboi;
  78         long fetched_usernum;
  79         char *data;
  80         int data_len;
  81         char buf[2048];
  82
  83         if (!who) return(1);
  84         if (!claimed_id) return(1);
  85         if (IsEmptyStr(claimed_id)) return(1);
  86
  87         /* Check to see if this OpenID is already in the database */
  88
  89         cdboi = cdb_fetch(CDB_OPENID, claimed_id, strlen(claimed_id));
  90         if (cdboi != NULL) {
  91                 memcpy(&fetched_usernum, cdboi->ptr, sizeof(long));
  92                 cdb_free(cdboi);
  93
  94                 if (fetched_usernum == who->usernum) {
  95                         CtdlLogPrintf(CTDL_INFO, "%s already associated; no action is taken\n", claimed_id);
  96                         return(0);
  97                 }
  98                 else {
  99                         CtdlLogPrintf(CTDL_INFO, "%s already belongs to another user\n", claimed_id);
 100                         return(3);
 101                 }
 102         }
 103
 104         /* Not already in the database, so attach it now */
 105
 106         data_len = sizeof(long) + strlen(claimed_id) + 1;
 107         data = malloc(data_len);
 108
 109         memcpy(data, &who->usernum, sizeof(long));
 110         memcpy(&data[sizeof(long)], claimed_id, strlen(claimed_id) + 1);
 111
 112         cdb_store(CDB_OPENID, claimed_id, strlen(claimed_id), data, data_len);
 113         free(data);
 114
 115         snprintf(buf, sizeof buf, "User <%s> (#%ld) has claimed the OpenID URL %s\n",
 116                 who->fullname, who->usernum, claimed_id);
 117         aide_message(buf, "OpenID claim");
 118         CtdlLogPrintf(CTDL_INFO, "%s", buf);
 119         return(0);
 120 }
 121
 122
 123
 124 /*
 125  * When a user is being deleted, we have to delete any OpenID associations
 126  */
 127 void openid_purge(struct ctdluser *usbuf) {
 128         struct cdbdata *cdboi;
 129         HashList *keys = NULL;
 130         HashPos *HashPos;
 131         char *deleteme = NULL;
 132         long len;
 133         void *Value;
 134         const char *Key;
 135
 136         keys = NewHash(1, NULL);
 137         if (!keys) return;
 138
 139
 140         cdb_rewind(CDB_OPENID);
 141         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 142                 if (cdboi->len > sizeof(long)) {
 143                         if (((long)*(cdboi->ptr)) == usbuf->usernum) {
 144                                 deleteme = strdup(cdboi->ptr + sizeof(long)),
 145                                 Put(keys, deleteme, strlen(deleteme), deleteme, generic_free_handler);
 146                         }
 147                 }
 148                 cdb_free(cdboi);
 149         }
 150
 151         /* Go through the hash list, deleting keys we stored in it */
 152
 153         HashPos = GetNewHashPos(keys, 0);
 154         while (GetNextHashPos(keys, HashPos, &len, &Key, &Value)!=0)
 155         {
 156                 CtdlLogPrintf(CTDL_DEBUG, "Deleting associated OpenID <%s>\n", Value);
 157                 cdb_delete(CDB_OPENID, Value, strlen(Value));
 158                 /* note: don't free(Value) -- deleting the hash list will handle this for us */
 159         }
 160         DeleteHashPos(&HashPos);
 161         DeleteHash(&keys);
 162 }
 163
 164
 165
 166 /*
 167  * List the OpenIDs associated with the currently logged in account
 168  */
 169 void cmd_oidl(char *argbuf) {
 170         struct cdbdata *cdboi;
 171
 172         if (CtdlAccessCheck(ac_logged_in)) return;
 173         cdb_rewind(CDB_OPENID);
 174         cprintf("%d Associated OpenIDs:\n", LISTING_FOLLOWS);
 175
 176         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 177                 if (cdboi->len > sizeof(long)) {
 178                         if (((long)*(cdboi->ptr)) == CC->user.usernum) {
 179                                 cprintf("%s\n", cdboi->ptr + sizeof(long));
 180                         }
 181                 }
 182                 cdb_free(cdboi);
 183         }
 184         cprintf("000\n");
 185 }
 186
 187
 188 /*
 189  * List ALL OpenIDs in the database
 190  */
 191 void cmd_oida(char *argbuf) {
 192         struct cdbdata *cdboi;
 193         long usernum;
 194
 195         if (CtdlAccessCheck(ac_aide)) return;
 196         cdb_rewind(CDB_OPENID);
 197         cprintf("%d List of all OpenIDs in the database:\n", LISTING_FOLLOWS);
 198
 199         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 200                 if (cdboi->len > sizeof(long)) {
 201                         memcpy(&usernum, cdboi->ptr, sizeof(long));
 202                         cprintf("%s|%ld\n",
 203                                 cdboi->ptr + sizeof(long),
 204                                 usernum
 205                         );
 206                 }
 207                 cdb_free(cdboi);
 208         }
 209         cprintf("000\n");
 210 }
 211
 212
 213 /*
 214  * Attempt to register (populate the vCard) the currently-logged-in user
 215  * using the data from Simple Registration Extension, if present.
 216  */
 217 void populate_vcard_from_sreg(HashList *sreg_keys) {
 218
 219         struct vCard *v;
 220         int pop = 0;                    /* number of fields populated */
 221         char *data = NULL;
 222         char *postcode = NULL;
 223         char *country = NULL;
 224
 225         if (!sreg_keys) return;
 226         v = vcard_new();
 227         if (!v) return;
 228
 229         if (GetHash(sreg_keys, "identity", 8, (void *) &data)) {
 230                 vcard_add_prop(v, "url;type=openid", data);
 231                 ++pop;
 232         }
 233
 234         if (GetHash(sreg_keys, "sreg.email", 10, (void *) &data)) {
 235                 vcard_add_prop(v, "email;internet", data);
 236                 ++pop;
 237         }
 238
 239         if (GetHash(sreg_keys, "sreg.nickname", 13, (void *) &data)) {
 240                 vcard_add_prop(v, "nickname", data);
 241                 ++pop;
 242         }
 243
 244         if (GetHash(sreg_keys, "sreg.fullname", 13, (void *) &data)) {
 245                 char n[256];
 246                 vcard_add_prop(v, "fn", data);
 247                 vcard_fn_to_n(n, data, sizeof n);
 248                 vcard_add_prop(v, "n", n);
 249                 ++pop;
 250         }
 251
 252         if (!GetHash(sreg_keys, "sreg.postcode", 13, (void *) &postcode)) {
 253                 postcode = NULL;
 254         }
 255
 256         if (!GetHash(sreg_keys, "sreg.country", 12, (void *) &country)) {
 257                 country = NULL;
 258         }
 259
 260         if (postcode || country) {
 261                 char adr[256];
 262                 snprintf(adr, sizeof adr, ";;;;;%s;%s",
 263                         (postcode ? postcode : ""),
 264                         (country ? country : "")
 265                 );
 266                 vcard_add_prop(v, "adr", adr);
 267                 ++pop;
 268         }
 269
 270         if (GetHash(sreg_keys, "sreg.dob", 8, (void *) &data)) {
 271                 vcard_add_prop(v, "bday", data);
 272                 ++pop;
 273         }
 274
 275         if (GetHash(sreg_keys, "sreg.gender", 11, (void *) &data)) {
 276                 vcard_add_prop(v, "x-funambol-gender", data);
 277                 ++pop;
 278         }
 279
 280         /* Only save the vCard if there is some useful data in it */
 281         if (pop > 0) {
 282                 char *ser;
 283                 ser = vcard_serialize(v);
 284                 if (ser) {
 285                         CtdlWriteObject(USERCONFIGROOM, "text/x-vcard",
 286                                 ser, strlen(ser)+1, &CC->user, 0, 0, 0
 287                         );
 288                         free(ser);
 289                 }
 290         }
 291         vcard_free(v);
 292 }
 293
 294
 295 /*
 296  * Create a new user account, manually specifying the name, after successfully
 297  * verifying an OpenID (which will of course be attached to the account)
 298  */
 299 void cmd_oidc(char *argbuf) {
 300         struct ctdl_openid *oiddata = (struct ctdl_openid *) CC->openid_data;
 301
 302         if (!oiddata) {
 303                 cprintf("%d You have not verified an OpenID yet.\n", ERROR);
 304                 return;
 305         }
 306
 307         if (!oiddata->verified) {
 308                 cprintf("%d You have not verified an OpenID yet.\n", ERROR);
 309                 return;
 310         }
 311
 312         /* We can make the semantics of OIDC exactly the same as NEWU, simply
 313          * by _calling_ cmd_newu() and letting it run.  Very clever!
 314          */
 315         cmd_newu(argbuf);
 316
 317         /* Now, if this logged us in, we have to attach the OpenID */
 318         if (CC->logged_in) {
 319                 attach_openid(&CC->user, oiddata->claimed_id);
 320                 if (oiddata->sreg_keys != NULL) {
 321                         populate_vcard_from_sreg(oiddata->sreg_keys);
 322                 }
 323         }
 324
 325 }
 326
 327
 328
 329
 330 /*
 331  * Detach an OpenID from the currently logged in account
 332  */
 333 void cmd_oidd(char *argbuf) {
 334         struct cdbdata *cdboi;
 335         char id_to_detach[1024];
 336         int this_is_mine = 0;
 337
 338         if (CtdlAccessCheck(ac_logged_in)) return;
 339         extract_token(id_to_detach, argbuf, 0, '|', sizeof id_to_detach);
 340         if (IsEmptyStr(id_to_detach)) {
 341                 cprintf("%d An empty OpenID URL is not allowed.\n", ERROR + ILLEGAL_VALUE);
 342         }
 343
 344         cdb_rewind(CDB_OPENID);
 345         while (cdboi = cdb_next_item(CDB_OPENID), cdboi != NULL) {
 346                 if (cdboi->len > sizeof(long)) {
 347                         if (((long)*(cdboi->ptr)) == CC->user.usernum) {
 348                                 this_is_mine = 1;
 349                         }
 350                 }
 351                 cdb_free(cdboi);
 352         }
 353
 354         if (!this_is_mine) {
 355                 cprintf("%d That OpenID was not found or not associated with your account.\n",
 356                         ERROR + ILLEGAL_VALUE);
 357                 return;
 358         }
 359
 360         cdb_delete(CDB_OPENID, id_to_detach, strlen(id_to_detach));
 361         cprintf("%d %s detached from your account.\n", CIT_OK, id_to_detach);
 362 }
 363
 364
 365
 366 /*
 367  * Attempt to auto-create a new Citadel account using the nickname from Simple Registration Extension
 368  */
 369 int openid_create_user_via_sreg(char *claimed_id, HashList *sreg_keys)
 370 {
 371         char *desired_name = NULL;
 372         char new_password[32];
 373
 374         if (config.c_auth_mode != AUTHMODE_NATIVE) return(1);
 375         if (config.c_disable_newu) return(2);
 376         if (CC->logged_in) return(3);
 377         if (!GetHash(sreg_keys, "sreg.nickname", 13, (void *) &desired_name)) return(4);
 378
 379         CtdlLogPrintf(CTDL_DEBUG, "The desired account name is <%s>\n", desired_name);
 380
 381         if (!getuser(&CC->user, desired_name)) {
 382                 CtdlLogPrintf(CTDL_DEBUG, "<%s> is already taken by another user.\n", desired_name);
 383                 memset(&CC->user, 0, sizeof(struct ctdluser));
 384                 return(5);
 385         }
 386
 387         /* The desired account name is available.  Create the account and log it in! */
 388         if (create_user(desired_name, 1)) return(6);
 389
 390         snprintf(new_password, sizeof new_password, "%08lx%08lx", random(), random());
 391         CtdlSetPassword(new_password);
 392         attach_openid(&CC->user, claimed_id);
 393         populate_vcard_from_sreg(sreg_keys);
 394         return(0);
 395 }
 396
 397
 398 /*
 399  * If a user account exists which is associated with the Claimed ID, log it in and return zero.
 400  * Otherwise it returns nonzero.
 401  */
 402 int login_via_openid(char *claimed_id)
 403 {
 404         struct cdbdata *cdboi;
 405         long usernum = 0;
 406
 407         cdboi = cdb_fetch(CDB_OPENID, claimed_id, strlen(claimed_id));
 408         if (cdboi == NULL) {
 409                 return(-1);
 410         }
 411
 412         memcpy(&usernum, cdboi->ptr, sizeof(long));
 413         cdb_free(cdboi);
 414
 415         if (!getuserbynumber(&CC->user, usernum)) {
 416                 /* Now become the user we just created */
 417                 safestrncpy(CC->curr_user, CC->user.fullname, sizeof CC->curr_user);
 418                 do_login();
 419                 return(0);
 420         }
 421         else {
 422                 memset(&CC->user, 0, sizeof(struct ctdluser));
 423                 return(-1);
 424         }
 425 }
 426
 427
 428
 429
 430 /**************************************************************************/
 431 /*                                                                        */
 432 /* Functions in this section handle OpenID protocol                       */
 433 /*                                                                        */
 434 /**************************************************************************/
 435
 436
 437 /*
 438  * Locate a <link> tag and, given its 'rel=' parameter, return its 'href' parameter
 439  */
 440 void extract_link(char *target_buf, int target_size, char *rel, char *source_buf)
 441 {
 442         char *ptr = source_buf;
 443
 444         if (!target_buf) return;
 445         if (!rel) return;
 446         if (!source_buf) return;
 447
 448         target_buf[0] = 0;
 449
 450         while (ptr = bmstrcasestr(ptr, "<link"), ptr != NULL) {
 451
 452                 char work_buffer[2048];
 453                 char *link_tag_start = NULL;
 454                 char *link_tag_end = NULL;
 455
 456                 char rel_tag[2048];
 457                 char href_tag[2048];
 458
 459                 link_tag_start = ptr;
 460                 link_tag_end = strchr(ptr, '>');
 461                 rel_tag[0] = 0;
 462                 href_tag[0] = 0;
 463
 464                 if ((link_tag_end) && (link_tag_end > link_tag_start)) {
 465                         int len;
 466                         len = link_tag_end - link_tag_start;
 467                         if (len > sizeof work_buffer) len = sizeof work_buffer;
 468                         memcpy(work_buffer, link_tag_start, len);
 469
 470                         char *rel_start = NULL;
 471                         char *rel_end = NULL;
 472                         rel_start = bmstrcasestr(work_buffer, "rel=");
 473                         if (rel_start) {
 474                                 rel_start = strchr(rel_start, '\"');
 475                                 if (rel_start) {
 476                                         ++rel_start;
 477                                         rel_end = strchr(rel_start, '\"');
 478                                         if ((rel_end) && (rel_end > rel_start)) {
 479                                                 safestrncpy(rel_tag, rel_start, rel_end - rel_start + 1);
 480                                         }
 481                                 }
 482                         }
 483
 484                         char *href_start = NULL;
 485                         char *href_end = NULL;
 486                         href_start = bmstrcasestr(work_buffer, "href=");
 487                         if (href_start) {
 488                                 href_start = strchr(href_start, '\"');
 489                                 if (href_start) {
 490                                         ++href_start;
 491                                         href_end = strchr(href_start, '\"');
 492                                         if ((href_end) && (href_end > href_start)) {
 493                                                 safestrncpy(href_tag, href_start, href_end - href_start + 1);
 494                                         }
 495                                 }
 496                         }
 497
 498                         if (!strcasecmp(rel, rel_tag)) {
 499                                 safestrncpy(target_buf, href_tag, target_size);
 500                                 return;
 501                         }
 502
 503                 }
 504
 505         ++ptr;
 506         }
 507
 508
 509 }
 510
 511
 512
 513 struct fh_data {
 514         char *buf;
 515         int total_bytes_received;
 516         int maxbytes;
 517 };
 518
 519
 520 size_t fh_callback(void *ptr, size_t size, size_t nmemb, void *stream)
 521 {
 522         struct fh_data *fh = (struct fh_data *) stream;
 523         int got_bytes = (size * nmemb);
 524
 525         if (fh->total_bytes_received + got_bytes > fh->maxbytes) {
 526                 got_bytes = fh->maxbytes - fh->total_bytes_received;
 527         }
 528         if (got_bytes > 0) {
 529                 memcpy(&fh->buf[fh->total_bytes_received], ptr, got_bytes);
 530                 fh->total_bytes_received += got_bytes;
 531         }
 532
 533         return (size * nmemb);  /* always succeed; libcurl doesn't need to know if we truncated it */
 534 }
 535
 536
 537
 538 /*
 539  * Begin an HTTP fetch (returns number of bytes actually fetched, or -1 for error) using libcurl.
 540  *
 541  * If 'normalize_len' is nonzero, the caller is specifying the buffer size of 'url', and is
 542  * requesting that the effective (normalized) URL be copied back to it.
 543  */
 544 int fetch_http(char *url, char *target_buf, int maxbytes, int normalize_len)
 545 {
 546         CURL *curl;
 547         CURLcode res;
 548         char errmsg[1024] = "";
 549         struct fh_data fh = {
 550                 target_buf,
 551                 0,
 552                 maxbytes
 553         };
 554         char *effective_url = NULL;
 555
 556         if (!url) return(-1);
 557         if (!target_buf) return(-1);
 558         memset(target_buf, 0, maxbytes);
 559
 560         curl = curl_easy_init();
 561         if (!curl) {
 562                 CtdlLogPrintf(CTDL_ALERT, "Unable to initialize libcurl.\n");
 563                 return(-1);
 564         }
 565
 566         curl_easy_setopt(curl, CURLOPT_URL, url);
 567         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 568         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 569         curl_easy_setopt(curl, CURLOPT_WRITEDATA, &fh);
 570         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fh_callback);
 571         curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
 572         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 573 #ifdef CURLOPT_HTTP_CONTENT_DECODING
 574         curl_easy_setopt(curl, CURLOPT_HTTP_CONTENT_DECODING, 1);
 575         curl_easy_setopt(curl, CURLOPT_ENCODING, "");
 576 #endif
 577         curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
 578         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 180);           /* die after 180 seconds */
 579         if (!IsEmptyStr(config.c_ip_addr)) {
 580                 curl_easy_setopt(curl, CURLOPT_INTERFACE, config.c_ip_addr);
 581         }
 582         res = curl_easy_perform(curl);
 583         if (res) {
 584                 CtdlLogPrintf(CTDL_DEBUG, "fetch_http() libcurl error %d: %s\n", res, errmsg);
 585         }
 586         if (normalize_len > 0) {
 587                 curl_easy_getinfo(curl, CURLINFO_EFFECTIVE_URL, &effective_url);
 588                 safestrncpy(url, effective_url, normalize_len);
 589         }
 590         curl_easy_cleanup(curl);
 591         return fh.total_bytes_received;
 592 }
 593
 594
 595 /*
 596  * Setup an OpenID authentication
 597  */
 598 void cmd_oids(char *argbuf) {
 599         char return_to[1024];
 600         char trust_root[1024];
 601         int i;
 602         char buf[SIZ];
 603         struct CitContext *CCC = CC;    /* CachedCitContext - performance boost */
 604         struct ctdl_openid *oiddata;
 605
 606         oiddata = (struct ctdl_openid *) CCC->openid_data;
 607
 608         if (oiddata != NULL) {
 609                 if (oiddata->sreg_keys != NULL) {
 610                         DeleteHash(&oiddata->sreg_keys);
 611                         oiddata->sreg_keys = NULL;
 612                 }
 613                 free(CCC->openid_data);
 614         }
 615         oiddata = malloc(sizeof(struct ctdl_openid));
 616         if (oiddata == NULL) {
 617                 cprintf("%d malloc failed\n", ERROR + INTERNAL_ERROR);
 618                 return;
 619         }
 620         memset(oiddata, 0, sizeof(struct ctdl_openid));
 621         CCC->openid_data = (void *) oiddata;
 622
 623         extract_token(oiddata->claimed_id, argbuf, 0, '|', sizeof oiddata->claimed_id);
 624         extract_token(return_to, argbuf, 1, '|', sizeof return_to);
 625         extract_token(trust_root, argbuf, 2, '|', sizeof trust_root);
 626         oiddata->verified = 0;
 627
 628         i = fetch_http(oiddata->claimed_id, buf, sizeof buf - 1, sizeof oiddata->claimed_id);
 629         CtdlLogPrintf(CTDL_DEBUG, "Normalized URL and Claimed ID is: %s\n", oiddata->claimed_id);
 630         buf[sizeof buf - 1] = 0;
 631         if (i > 0) {
 632                 char openid_delegate[1024];
 633
 634                 extract_link(oiddata->server, sizeof oiddata->server, "openid.server", buf);
 635                 extract_link(openid_delegate, sizeof openid_delegate, "openid.delegate", buf);
 636
 637                 if (IsEmptyStr(oiddata->server)) {
 638                         cprintf("%d There is no OpenID identity provider at this URL.\n", ERROR);
 639                         return;
 640                 }
 641
 642                 /* Empty delegate is legal; we just use the openid_url instead */
 643                 if (IsEmptyStr(openid_delegate)) {
 644                         safestrncpy(openid_delegate, oiddata->claimed_id, sizeof openid_delegate);
 645                 }
 646
 647                 /* Assemble a URL to which the user-agent will be redirected. */
 648                 char redirect_string[4096];
 649                 char escaped_identity[512];
 650                 char escaped_return_to[2048];
 651                 char escaped_trust_root[1024];
 652                 char escaped_sreg_optional[256];
 653
 654                 urlesc(escaped_identity, sizeof escaped_identity, openid_delegate);
 655                 urlesc(escaped_return_to, sizeof escaped_return_to, return_to);
 656                 urlesc(escaped_trust_root, sizeof escaped_trust_root, trust_root);
 657                 urlesc(escaped_sreg_optional, sizeof escaped_sreg_optional,
 658                         "nickname,email,fullname,postcode,country,dob,gender");
 659
 660                 snprintf(redirect_string, sizeof redirect_string,
 661                         "%s"
 662                         "?openid.mode=checkid_setup"
 663                         "&openid.identity=%s"
 664                         "&openid.return_to=%s"
 665                         "&openid.trust_root=%s"
 666                         "&openid.sreg.optional=%s"
 667                         ,
 668                         oiddata->server,
 669                         escaped_identity,
 670                         escaped_return_to,
 671                         escaped_trust_root,
 672                         escaped_sreg_optional
 673                 );
 674                 cprintf("%d %s\n", CIT_OK, redirect_string);
 675                 return;
 676         }
 677
 678         cprintf("%d Unable to fetch OpenID URL\n", ERROR);
 679 }
 680
 681
 682
 683
 684
 685 /*
 686  * Finalize an OpenID authentication
 687  */
 688 void cmd_oidf(char *argbuf) {
 689         char buf[2048];
 690         char thiskey[1024];
 691         char thisdata[1024];
 692         HashList *keys = NULL;
 693         struct ctdl_openid *oiddata = (struct ctdl_openid *) CC->openid_data;
 694
 695         keys = NewHash(1, NULL);
 696         if (!keys) {
 697                 cprintf("%d NewHash() failed\n", ERROR + INTERNAL_ERROR);
 698                 return;
 699         }
 700
 701         cprintf("%d Transmit OpenID data now\n", START_CHAT_MODE);
 702
 703         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 704                 extract_token(thiskey, buf, 0, '|', sizeof thiskey);
 705                 extract_token(thisdata, buf, 1, '|', sizeof thisdata);
 706                 CtdlLogPrintf(CTDL_DEBUG, "%s: [%d] %s\n", thiskey, strlen(thisdata), thisdata);
 707                 Put(keys, thiskey, strlen(thiskey), strdup(thisdata), generic_free_handler);
 708         }
 709
 710
 711         /* Now that we have all of the parameters, we have to validate the signature against the server */
 712         CtdlLogPrintf(CTDL_DEBUG, "About to validate the signature...\n");
 713
 714         CURL *curl;
 715         CURLcode res;
 716         struct curl_httppost *formpost = NULL;
 717         struct curl_httppost *lastptr = NULL;
 718         char errmsg[1024] = "";
 719         char *o_assoc_handle = NULL;
 720         char *o_sig = NULL;
 721         char *o_signed = NULL;
 722         int num_signed_values;
 723         int i;
 724         char k_keyname[128];
 725         char k_o_keyname[128];
 726         char *k_value = NULL;
 727         char valbuf[1024];
 728
 729         struct fh_data fh = {
 730                 valbuf,
 731                 0,
 732                 sizeof valbuf
 733         };
 734
 735         curl_formadd(&formpost, &lastptr,
 736                 CURLFORM_COPYNAME,      "openid.mode",
 737                 CURLFORM_COPYCONTENTS,  "check_authentication",
 738                 CURLFORM_END);
 739         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.mode", "check_authentication");
 740
 741         if (GetHash(keys, "assoc_handle", 12, (void *) &o_assoc_handle)) {
 742                 curl_formadd(&formpost, &lastptr,
 743                         CURLFORM_COPYNAME,      "openid.assoc_handle",
 744                         CURLFORM_COPYCONTENTS,  o_assoc_handle,
 745                         CURLFORM_END);
 746                 CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.assoc_handle", o_assoc_handle);
 747         }
 748
 749         if (GetHash(keys, "sig", 3, (void *) &o_sig)) {
 750                 curl_formadd(&formpost, &lastptr,
 751                         CURLFORM_COPYNAME,      "openid.sig",
 752                         CURLFORM_COPYCONTENTS,  o_sig,
 753                         CURLFORM_END);
 754                         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.sig", o_sig);
 755         }
 756
 757         if (GetHash(keys, "signed", 6, (void *) &o_signed)) {
 758                 curl_formadd(&formpost, &lastptr,
 759                         CURLFORM_COPYNAME,      "openid.signed",
 760                         CURLFORM_COPYCONTENTS,  o_signed,
 761                         CURLFORM_END);
 762                 CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", "openid.signed", o_signed);
 763
 764                 num_signed_values = num_tokens(o_signed, ',');
 765                 for (i=0; i<num_signed_values; ++i) {
 766                         extract_token(k_keyname, o_signed, i, ',', sizeof k_keyname);
 767                         if (strcasecmp(k_keyname, "mode")) {    // work around phpMyID bug
 768                                 if (GetHash(keys, k_keyname, strlen(k_keyname), (void *) &k_value)) {
 769                                         snprintf(k_o_keyname, sizeof k_o_keyname, "openid.%s", k_keyname);
 770                                         curl_formadd(&formpost, &lastptr,
 771                                                 CURLFORM_COPYNAME,      k_o_keyname,
 772                                                 CURLFORM_COPYCONTENTS,  k_value,
 773                                                 CURLFORM_END);
 774                                         CtdlLogPrintf(CTDL_DEBUG, "%25s : %s\n", k_o_keyname, k_value);
 775                                 }
 776                                 else {
 777                                         CtdlLogPrintf(CTDL_INFO, "OpenID: signed field '%s' is missing\n",
 778                                                 k_keyname);
 779                                 }
 780                         }
 781                 }
 782         }
 783
 784         curl = curl_easy_init();
 785         curl_easy_setopt(curl, CURLOPT_URL, oiddata->server);
 786         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 787         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 788         curl_easy_setopt(curl, CURLOPT_WRITEDATA, &fh);
 789         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fh_callback);
 790         curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 791         curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
 792         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 793 #ifdef CURLOPT_HTTP_CONTENT_DECODING
 794         curl_easy_setopt(curl, CURLOPT_HTTP_CONTENT_DECODING, 1);
 795         curl_easy_setopt(curl, CURLOPT_ENCODING, "");
 796 #endif
 797         curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
 798         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 180);           /* die after 180 seconds */
 799         if (!IsEmptyStr(config.c_ip_addr)) {
 800                 curl_easy_setopt(curl, CURLOPT_INTERFACE, config.c_ip_addr);
 801         }
 802
 803         res = curl_easy_perform(curl);
 804         if (res) {
 805                 CtdlLogPrintf(CTDL_DEBUG, "cmd_oidf() libcurl error %d: %s\n", res, errmsg);
 806         }
 807         curl_easy_cleanup(curl);
 808         curl_formfree(formpost);
 809
 810         valbuf[fh.total_bytes_received] = 0;
 811
 812         if (bmstrcasestr(valbuf, "is_valid:true")) {
 813                 oiddata->verified = 1;
 814         }
 815
 816         CtdlLogPrintf(CTDL_DEBUG, "Authentication %s.\n", (oiddata->verified ? "succeeded" : "failed") );
 817
 818         /* Respond to the client */
 819
 820         if (oiddata->verified) {
 821
 822                 /* If we were already logged in, attach the OpenID to the user's account */
 823                 if (CC->logged_in) {
 824                         if (attach_openid(&CC->user, oiddata->claimed_id) == 0) {
 825                                 cprintf("attach\n");
 826                                 CtdlLogPrintf(CTDL_DEBUG, "OpenID attach succeeded\n");
 827                         }
 828                         else {
 829                                 cprintf("fail\n");
 830                                 CtdlLogPrintf(CTDL_DEBUG, "OpenID attach failed\n");
 831                         }
 832                 }
 833
 834                 /* Otherwise, a user is attempting to log in using the verified OpenID */
 835                 else {
 836                         /*
 837                          * Existing user who has claimed this OpenID?
 838                          *
 839                          * Note: if you think that sending the password back over the wire is insecure,
 840                          * check your assumptions.  If someone has successfully asserted an OpenID that
 841                          * is associated with the account, they already have password equivalency and can
 842                          * login, so they could just as easily change the password, etc.
 843                          */
 844                         if (login_via_openid(oiddata->claimed_id) == 0) {
 845                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
 846                                 logged_in_response();
 847                                 CtdlLogPrintf(CTDL_DEBUG, "Logged in using previously claimed OpenID\n");
 848                         }
 849
 850                         /*
 851                          * If this system does not allow self-service new user registration, the
 852                          * remaining modes do not apply, so fail here and now.
 853                          */
 854                         else if (config.c_disable_newu) {
 855                                 cprintf("fail\n");
 856                                 CtdlLogPrintf(CTDL_DEBUG, "Creating user failed due to local policy\n");
 857                         }
 858
 859                         /*
 860                          * New user whose OpenID is verified and Simple Registration Extension is in use?
 861                          */
 862                         else if (openid_create_user_via_sreg(oiddata->claimed_id, keys) == 0) {
 863                                 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
 864                                 logged_in_response();
 865                                 CtdlLogPrintf(CTDL_DEBUG, "Successfully auto-created new user\n");
 866                         }
 867
 868                         /*
 869                          * OpenID is verified, but the desired username either was not specified or
 870                          * conflicts with an existing user.  Manual account creation is required.
 871                          */
 872                         else {
 873                                 char *desired_name = NULL;
 874                                 cprintf("verify_only\n");
 875                                 cprintf("%s\n", oiddata->claimed_id);
 876                                 if (GetHash(keys, "sreg.nickname", 13, (void *) &desired_name)) {
 877                                         cprintf("%s\n", desired_name);
 878                                 }
 879                                 else {
 880                                         cprintf("\n");
 881                                 }
 882                                 CtdlLogPrintf(CTDL_DEBUG, "The desired Simple Registration name is already taken.\n");
 883                         }
 884                 }
 885         }
 886         else {
 887                 cprintf("fail\n");
 888         }
 889         cprintf("000\n");
 890
 891         if (oiddata->sreg_keys != NULL) {
 892                 DeleteHash(&oiddata->sreg_keys);
 893                 oiddata->sreg_keys = NULL;
 894         }
 895         oiddata->sreg_keys = keys;
 896 }
 897
 898
 899
 900 /**************************************************************************/
 901 /*                                                                        */
 902 /* Functions in this section handle module initialization and shutdown    */
 903 /*                                                                        */
 904 /**************************************************************************/
 905
 906
 907 /*
 908  * This cleanup function blows away the temporary memory used by this module.
 909  */
 910 void openid_cleanup_function(void) {
 911         struct ctdl_openid *oiddata = (struct ctdl_openid *) CC->openid_data;
 912
 913         if (oiddata != NULL) {
 914                 CtdlLogPrintf(CTDL_DEBUG, "Clearing OpenID session state\n");
 915                 if (oiddata->sreg_keys != NULL) {
 916                         DeleteHash(&oiddata->sreg_keys);
 917                         oiddata->sreg_keys = NULL;
 918                 }
 919                 free(oiddata);
 920         }
 921 }
 922
 923
 924 CTDL_MODULE_INIT(openid_rp)
 925 {
 926         if (!threading) {
 927                 curl_global_init(CURL_GLOBAL_ALL);
 928
 929                 /* Only enable the OpenID command set when native mode authentication is in use. */
 930                 if (config.c_auth_mode == AUTHMODE_NATIVE) {
 931                         CtdlRegisterProtoHook(cmd_oids, "OIDS", "Setup OpenID authentication");
 932                         CtdlRegisterProtoHook(cmd_oidf, "OIDF", "Finalize OpenID authentication");
 933                         CtdlRegisterProtoHook(cmd_oidl, "OIDL", "List OpenIDs associated with an account");
 934                         CtdlRegisterProtoHook(cmd_oidd, "OIDD", "Detach an OpenID from an account");
 935                         CtdlRegisterProtoHook(cmd_oidc, "OIDC", "Create new user after validating OpenID");
 936                         CtdlRegisterProtoHook(cmd_oida, "OIDA", "List all OpenIDs in the database");
 937                 }
 938                 CtdlRegisterSessionHook(openid_cleanup_function, EVT_LOGOUT);
 939                 CtdlRegisterUserHook(openid_purge, EVT_PURGEUSER);
 940         }
 941
 942         /* return our Subversion id for the Log */
 943         return "$Id$";
 944 }