2 * This is an implementation of OpenID 2.0 relying party support in stateless mode.
4 * Copyright (c) 2007-2017 by the citadel.org team
6 * This program is open source software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 3 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
28 #include <sys/types.h>
30 #if TIME_WITH_SYS_TIME
31 # include <sys/time.h>
35 # include <sys/time.h>
44 #include <curl/curl.h>
46 #include "ctdl_module.h"
48 #include "citserver.h"
51 typedef struct _ctdl_openid {
52 StrBuf *op_url; /* OpenID Provider Endpoint URL */
53 StrBuf *claimed_id; /* Claimed Identifier */
65 void Free_ctdl_openid(ctdl_openid **FreeMe)
67 if (*FreeMe == NULL) {
70 FreeStrBuf(&(*FreeMe)->op_url);
71 FreeStrBuf(&(*FreeMe)->claimed_id);
72 DeleteHash(&(*FreeMe)->sreg_keys);
79 * This cleanup function blows away the temporary memory used by this module.
81 void openid_cleanup_function(void) {
82 struct CitContext *CCC = CC; /* CachedCitContext - performance boost */
84 if (CCC->openid_data != NULL) {
85 syslog(LOG_DEBUG, "openid: Clearing OpenID session state");
86 Free_ctdl_openid((ctdl_openid **) &CCC->openid_data);
91 /**************************************************************************/
93 /* Functions in this section handle Citadel internal OpenID mapping stuff */
95 /**************************************************************************/
99 * The structure of an openid record *key* is:
101 * |--------------claimed_id-------------|
102 * (actual length of claimed id)
105 * The structure of an openid record *value* is:
107 * |-----user_number----|------------claimed_id---------------|
108 * (sizeof long) (actual length of claimed id)
115 * Attach an external authenticator (such as an OpenID) to a Citadel account
117 int attach_extauth(struct ctdluser *who, StrBuf *claimed_id)
119 struct cdbdata *cdboi;
120 long fetched_usernum;
126 if (StrLength(claimed_id)==0) return(1);
128 /* Check to see if this authenticator is already in the database */
130 cdboi = cdb_fetch(CDB_EXTAUTH, ChrPtr(claimed_id), StrLength(claimed_id));
132 memcpy(&fetched_usernum, cdboi->ptr, sizeof(long));
135 if (fetched_usernum == who->usernum) {
136 syslog(LOG_INFO, "openid: %s already associated; no action is taken", ChrPtr(claimed_id));
140 syslog(LOG_INFO, "openid: %s already belongs to another user", ChrPtr(claimed_id));
145 /* Not already in the database, so attach it now */
147 data_len = sizeof(long) + StrLength(claimed_id) + 1;
148 data = malloc(data_len);
150 memcpy(data, &who->usernum, sizeof(long));
151 memcpy(&data[sizeof(long)], ChrPtr(claimed_id), StrLength(claimed_id) + 1);
153 cdb_store(CDB_EXTAUTH, ChrPtr(claimed_id), StrLength(claimed_id), data, data_len);
156 snprintf(buf, sizeof buf, "User <%s> (#%ld) is now associated with %s\n", who->fullname, who->usernum, ChrPtr(claimed_id));
157 CtdlAideMessage(buf, "External authenticator claim");
158 syslog(LOG_INFO, "openid: %s", buf);
164 * When a user is being deleted, we have to delete any OpenID associations
166 void extauth_purge(struct ctdluser *usbuf) {
167 struct cdbdata *cdboi;
168 HashList *keys = NULL;
170 char *deleteme = NULL;
176 keys = NewHash(1, NULL);
179 cdb_rewind(CDB_EXTAUTH);
180 while (cdboi = cdb_next_item(CDB_EXTAUTH), cdboi != NULL) {
181 if (cdboi->len > sizeof(long)) {
182 memcpy(&usernum, cdboi->ptr, sizeof(long));
183 if (usernum == usbuf->usernum) {
184 deleteme = strdup(cdboi->ptr + sizeof(long)),
185 Put(keys, deleteme, strlen(deleteme), deleteme, NULL);
191 /* Go through the hash list, deleting keys we stored in it */
193 HashPos = GetNewHashPos(keys, 0);
194 while (GetNextHashPos(keys, HashPos, &len, &Key, &Value)!=0)
196 syslog(LOG_DEBUG, "openid: deleting associated external authenticator <%s>", (char*)Value);
197 cdb_delete(CDB_EXTAUTH, Value, strlen(Value));
198 /* note: don't free(Value) -- deleting the hash list will handle this for us */
200 DeleteHashPos(&HashPos);
206 * List the OpenIDs associated with the currently logged in account
208 void cmd_oidl(char *argbuf) {
209 struct cdbdata *cdboi;
212 if (CtdlGetConfigInt("c_disable_newu"))
214 cprintf("%d this system does not support openid.\n", ERROR + CMD_NOT_SUPPORTED);
217 if (CtdlAccessCheck(ac_logged_in)) return;
219 cdb_rewind(CDB_EXTAUTH);
220 cprintf("%d Associated external authenticators:\n", LISTING_FOLLOWS);
222 while (cdboi = cdb_next_item(CDB_EXTAUTH), cdboi != NULL) {
223 if (cdboi->len > sizeof(long)) {
224 memcpy(&usernum, cdboi->ptr, sizeof(long));
225 if (usernum == CC->user.usernum) {
226 cprintf("%s\n", cdboi->ptr + sizeof(long));
236 * List ALL OpenIDs in the database
238 void cmd_oida(char *argbuf) {
239 struct cdbdata *cdboi;
241 struct ctdluser usbuf;
243 if (CtdlGetConfigInt("c_disable_newu"))
245 cprintf("%d this system does not support openid.\n",
246 ERROR + CMD_NOT_SUPPORTED);
249 if (CtdlAccessCheck(ac_aide)) return;
250 cdb_rewind(CDB_EXTAUTH);
251 cprintf("%d List of all OpenIDs in the database:\n", LISTING_FOLLOWS);
253 while (cdboi = cdb_next_item(CDB_EXTAUTH), cdboi != NULL) {
254 if (cdboi->len > sizeof(long)) {
255 memcpy(&usernum, cdboi->ptr, sizeof(long));
256 if (CtdlGetUserByNumber(&usbuf, usernum) != 0) {
257 usbuf.fullname[0] = 0;
259 cprintf("%s|%ld|%s\n",
260 cdboi->ptr + sizeof(long),
272 * Create a new user account, manually specifying the name, after successfully
273 * verifying an OpenID (which will of course be attached to the account)
275 void cmd_oidc(char *argbuf) {
276 ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
278 if (CtdlGetConfigInt("c_disable_newu"))
280 cprintf("%d this system does not support openid.\n",
281 ERROR + CMD_NOT_SUPPORTED);
284 if ( (!oiddata) || (!oiddata->verified) ) {
285 cprintf("%d You have not verified an OpenID yet.\n", ERROR);
289 /* We can make the semantics of OIDC exactly the same as NEWU, simply
290 * by _calling_ cmd_newu() and letting it run. Very clever!
294 /* Now, if this logged us in, we have to attach the OpenID */
296 attach_extauth(&CC->user, oiddata->claimed_id);
303 * Detach an OpenID from the currently logged in account
305 void cmd_oidd(char *argbuf) {
306 struct cdbdata *cdboi;
307 char id_to_detach[1024];
308 int this_is_mine = 0;
311 if (CtdlGetConfigInt("c_disable_newu"))
313 cprintf("%d this system does not support openid.\n",
314 ERROR + CMD_NOT_SUPPORTED);
317 if (CtdlAccessCheck(ac_logged_in)) return;
318 extract_token(id_to_detach, argbuf, 0, '|', sizeof id_to_detach);
319 if (IsEmptyStr(id_to_detach)) {
320 cprintf("%d An empty OpenID URL is not allowed.\n", ERROR + ILLEGAL_VALUE);
323 cdb_rewind(CDB_EXTAUTH);
324 while (cdboi = cdb_next_item(CDB_EXTAUTH), cdboi != NULL) {
325 if (cdboi->len > sizeof(long)) {
326 memcpy(&usernum, cdboi->ptr, sizeof(long));
327 if (usernum == CC->user.usernum) {
335 cprintf("%d That OpenID was not found or not associated with your account.\n",
336 ERROR + ILLEGAL_VALUE);
340 cdb_delete(CDB_EXTAUTH, id_to_detach, strlen(id_to_detach));
341 cprintf("%d %s detached from your account.\n", CIT_OK, id_to_detach);
346 * Attempt to auto-create a new Citadel account using the nickname from Attribute Exchange
348 int openid_create_user_via_ax(StrBuf *claimed_id, HashList *sreg_keys)
350 char *nickname = NULL;
351 char *firstname = NULL;
352 char *lastname = NULL;
353 char new_password[32];
358 if (CtdlGetConfigInt("c_auth_mode") != AUTHMODE_NATIVE) return(1);
359 if (CtdlGetConfigInt("c_disable_newu")) return(2);
360 if (CC->logged_in) return(3);
362 HashPos *HashPos = GetNewHashPos(sreg_keys, 0);
363 while (GetNextHashPos(sreg_keys, HashPos, &len, &Key, &Value) != 0) {
364 syslog(LOG_DEBUG, "openid: %s = %s", Key, (char *)Value);
366 if (cbmstrcasestr(Key, "value.nickname") != NULL) {
367 nickname = (char *)Value;
369 else if ( (nickname == NULL) && (cbmstrcasestr(Key, "value.nickname") != NULL)) {
370 nickname = (char *)Value;
372 else if (cbmstrcasestr(Key, "value.firstname") != NULL) {
373 firstname = (char *)Value;
375 else if (cbmstrcasestr(Key, "value.lastname") != NULL) {
376 lastname = (char *)Value;
380 DeleteHashPos(&HashPos);
382 if (nickname == NULL) {
383 if ((firstname != NULL) || (lastname != NULL)) {
384 char fullname[1024] = "";
385 if (firstname) strcpy(fullname, firstname);
386 if (firstname && lastname) strcat(fullname, " ");
387 if (lastname) strcat(fullname, lastname);
392 if (nickname == NULL) {
395 syslog(LOG_DEBUG, "openid: the desired account name is <%s>", nickname);
397 len = cutuserkey(nickname);
398 if (!CtdlGetUser(&CC->user, nickname)) {
399 syslog(LOG_DEBUG, "openid: <%s> is already taken by another user.", nickname);
400 memset(&CC->user, 0, sizeof(struct ctdluser));
404 /* The desired account name is available. Create the account and log it in! */
405 if (create_user(nickname, CREATE_USER_BECOME_USER, NATIVE_AUTH_UID)) return(6);
407 /* Generate a random password.
408 * The user doesn't care what the password is since he is using OpenID.
410 snprintf(new_password, sizeof new_password, "%08lx%08lx", random(), random());
411 CtdlSetPassword(new_password);
413 /* Now attach the verified OpenID to this account. */
414 attach_extauth(&CC->user, claimed_id);
421 * If a user account exists which is associated with the Claimed ID, log it in and return zero.
422 * Otherwise it returns nonzero.
424 int login_via_extauth(StrBuf *claimed_id)
426 struct cdbdata *cdboi;
429 cdboi = cdb_fetch(CDB_EXTAUTH, ChrPtr(claimed_id), StrLength(claimed_id));
434 memcpy(&usernum, cdboi->ptr, sizeof(long));
437 if (!CtdlGetUserByNumber(&CC->user, usernum)) {
438 /* Now become the user we just created */
439 safestrncpy(CC->curr_user, CC->user.fullname, sizeof CC->curr_user);
444 memset(&CC->user, 0, sizeof(struct ctdluser));
452 /**************************************************************************/
454 /* Functions in this section handle OpenID protocol */
456 /**************************************************************************/
460 * Locate a <link> tag and, given its 'rel=' parameter, return its 'href' parameter
462 void extract_link(StrBuf *target_buf, const char *rel, long repllen, StrBuf *source_buf)
466 const char *href_start = NULL;
467 const char *href_end = NULL;
468 const char *link_tag_start = NULL;
469 const char *link_tag_end = NULL;
470 const char *rel_start = NULL;
471 const char *rel_end = NULL;
473 if (!target_buf) return;
475 if (!source_buf) return;
477 ptr = ChrPtr(source_buf);
479 FlushStrBuf(target_buf);
480 while (ptr = cbmstrcasestr(ptr, "<link"), ptr != NULL) {
482 link_tag_start = ptr;
483 link_tag_end = strchr(ptr, '>');
484 if (link_tag_end == NULL)
486 for (i=0; i < 1; i++ ){
487 rel_start = cbmstrcasestr(link_tag_start, "rel=");
488 if ((rel_start == NULL) ||
489 (rel_start > link_tag_end))
492 rel_start = strchr(rel_start, '\"');
493 if ((rel_start == NULL) ||
494 (rel_start > link_tag_end))
497 rel_end = strchr(rel_start, '\"');
498 if ((rel_end == NULL) ||
499 (rel_end == rel_start) ||
500 (rel_end >= link_tag_end) )
502 if (strncasecmp(rel, rel_start, repllen)!= 0)
503 continue; /* didn't match? never mind... */
505 href_start = cbmstrcasestr(link_tag_start, "href=");
506 if ((href_start == NULL) ||
507 (href_start >= link_tag_end))
509 href_start = strchr(href_start, '\"');
510 if ((href_start == NULL) |
511 (href_start >= link_tag_end))
514 href_end = strchr(href_start, '\"');
515 if ((href_end == NULL) ||
516 (href_end == href_start) ||
517 (href_start >= link_tag_end))
519 StrBufPlain(target_buf, href_start, href_end - href_start);
527 * Wrapper for curl_easy_init() that includes the options common to all calls
528 * used in this module.
530 CURL *ctdl_openid_curl_easy_init(char *errmsg) {
533 curl = curl_easy_init();
538 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
539 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
542 curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
544 curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
545 #ifdef CURLOPT_HTTP_CONTENT_DECODING
546 curl_easy_setopt(curl, CURLOPT_HTTP_CONTENT_DECODING, 1);
547 curl_easy_setopt(curl, CURLOPT_ENCODING, "");
549 curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
550 curl_easy_setopt(curl, CURLOPT_TIMEOUT, 30); /* die after 30 seconds */
553 (!IsEmptyStr(CtdlGetConfigStr("c_ip_addr")))
554 && (strcmp(CtdlGetConfigStr("c_ip_addr"), "*"))
555 && (strcmp(CtdlGetConfigStr("c_ip_addr"), "::"))
556 && (strcmp(CtdlGetConfigStr("c_ip_addr"), "0.0.0.0"))
558 curl_easy_setopt(curl, CURLOPT_INTERFACE, CtdlGetConfigStr("c_ip_addr"));
569 int current_service_priority;
570 int selected_service_priority;
571 StrBuf *current_service_uri;
572 StrBuf *selected_service_uri;
573 int current_service_is_oid2auth;
577 void xrds_xml_start(void *data, const char *supplied_el, const char **attr) {
578 struct xrds *xrds = (struct xrds *) data;
581 ++xrds->nesting_level;
583 if (!strcasecmp(supplied_el, "XRD")) {
587 else if (!strcasecmp(supplied_el, "service")) {
588 xrds->current_service_priority = 0;
589 xrds->current_service_is_oid2auth = 0;
590 for (i=0; attr[i] != NULL; i+=2) {
591 if (!strcasecmp(attr[i], "priority")) {
592 xrds->current_service_priority = atoi(attr[i+1]);
597 FlushStrBuf(xrds->CharData);
601 void xrds_xml_end(void *data, const char *supplied_el) {
602 struct xrds *xrds = (struct xrds *) data;
604 --xrds->nesting_level;
606 if (!strcasecmp(supplied_el, "XRD")) {
610 else if (!strcasecmp(supplied_el, "type")) {
612 && (!strcasecmp(ChrPtr(xrds->CharData), "http://specs.openid.net/auth/2.0/server"))
614 xrds->current_service_is_oid2auth = 1;
617 && (!strcasecmp(ChrPtr(xrds->CharData), "http://specs.openid.net/auth/2.0/signon"))
619 xrds->current_service_is_oid2auth = 1;
620 /* FIXME in this case, the Claimed ID should be considered immutable */
624 else if (!strcasecmp(supplied_el, "uri")) {
626 FlushStrBuf(xrds->current_service_uri);
627 StrBufAppendBuf(xrds->current_service_uri, xrds->CharData, 0);
631 else if (!strcasecmp(supplied_el, "service")) {
633 && (xrds->current_service_priority < xrds->selected_service_priority)
634 && (xrds->current_service_is_oid2auth)
636 xrds->selected_service_priority = xrds->current_service_priority;
637 FlushStrBuf(xrds->selected_service_uri);
638 StrBufAppendBuf(xrds->selected_service_uri, xrds->current_service_uri, 0);
643 FlushStrBuf(xrds->CharData);
647 void xrds_xml_chardata(void *data, const XML_Char *s, int len) {
648 struct xrds *xrds = (struct xrds *) data;
650 StrBufAppendBufPlain (xrds->CharData, s, len, 0);
655 * Parse an XRDS document.
656 * If an OpenID Provider URL is discovered, op_url to that value and return nonzero.
657 * If nothing useful happened, return 0.
659 int parse_xrds_document(StrBuf *ReplyBuf) {
660 ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
662 int return_value = 0;
664 memset(&xrds, 0, sizeof (struct xrds));
665 xrds.selected_service_priority = INT_MAX;
666 xrds.CharData = NewStrBuf();
667 xrds.current_service_uri = NewStrBuf();
668 xrds.selected_service_uri = NewStrBuf();
669 XML_Parser xp = XML_ParserCreate(NULL);
671 XML_SetUserData(xp, &xrds);
672 XML_SetElementHandler(xp, xrds_xml_start, xrds_xml_end);
673 XML_SetCharacterDataHandler(xp, xrds_xml_chardata);
674 XML_Parse(xp, ChrPtr(ReplyBuf), StrLength(ReplyBuf), 0);
675 XML_Parse(xp, "", 0, 1);
679 syslog(LOG_ERR, "openid: cannot create XML parser");
682 if (xrds.selected_service_priority < INT_MAX) {
683 if (oiddata->op_url == NULL) {
684 oiddata->op_url = NewStrBuf();
686 FlushStrBuf(oiddata->op_url);
687 StrBufAppendBuf(oiddata->op_url, xrds.selected_service_uri, 0);
688 return_value = openid_disco_xrds;
691 FreeStrBuf(&xrds.CharData);
692 FreeStrBuf(&xrds.current_service_uri);
693 FreeStrBuf(&xrds.selected_service_uri);
695 return(return_value);
700 * Callback function for perform_openid2_discovery()
701 * We're interested in the X-XRDS-Location: header.
703 size_t yadis_headerfunction(void *ptr, size_t size, size_t nmemb, void *userdata) {
705 StrBuf **x_xrds_location = (StrBuf **) userdata;
707 memcpy(hdr, ptr, (size*nmemb));
710 if (!strncasecmp(hdr, "X-XRDS-Location:", 16)) {
711 *x_xrds_location = NewStrBufPlain(&hdr[16], ((size*nmemb)-16));
712 StrBufTrim(*x_xrds_location);
715 return(size * nmemb);
719 /* Attempt to perform Yadis discovery as specified in Yadis 1.0 section 6.2.5.
721 * If Yadis fails, we then attempt HTML discovery using the same document.
723 * If successful, returns nonzero and calls parse_xrds_document() to act upon the received data.
724 * If fails, returns 0 and does nothing else.
726 int perform_openid2_discovery(StrBuf *SuppliedURL) {
727 ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
729 StrBuf *ReplyBuf = NULL;
730 int return_value = 0;
733 char errmsg[1024] = "";
734 struct curl_slist *my_headers = NULL;
735 StrBuf *x_xrds_location = NULL;
737 if (!SuppliedURL) return(0);
738 syslog(LOG_DEBUG, "openid: perform_openid2_discovery(%s)", ChrPtr(SuppliedURL));
739 if (StrLength(SuppliedURL) == 0) return(0);
741 ReplyBuf = NewStrBuf();
742 if (!ReplyBuf) return(0);
744 curl = ctdl_openid_curl_easy_init(errmsg);
745 if (!curl) return(0);
747 curl_easy_setopt(curl, CURLOPT_URL, ChrPtr(SuppliedURL));
748 curl_easy_setopt(curl, CURLOPT_WRITEDATA, ReplyBuf);
749 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, CurlFillStrBuf_callback);
751 my_headers = curl_slist_append(my_headers, "Accept:"); /* disable the default Accept: header */
752 my_headers = curl_slist_append(my_headers, "Accept: application/xrds+xml");
753 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, my_headers);
755 curl_easy_setopt(curl, CURLOPT_WRITEHEADER, &x_xrds_location);
756 curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, yadis_headerfunction);
758 result = curl_easy_perform(curl);
760 syslog(LOG_DEBUG, "openid: libcurl error %d: %s", result, errmsg);
762 curl_slist_free_all(my_headers);
763 curl_easy_cleanup(curl);
764 docbytes = StrLength(ReplyBuf);
767 * The response from the server will be one of:
769 * Option 1: An HTML document with a <head> element that includes a <meta> element with http-equiv
770 * attribute, X-XRDS-Location,
772 * Does any provider actually do this? If so then we will implement it in the future.
776 * Option 2: HTTP response-headers that include an X-XRDS-Location response-header,
777 * together with a document.
778 * Option 3: HTTP response-headers only, which MAY include an X-XRDS-Location response-header,
779 * a contenttype response-header specifying MIME media type,
780 * application/xrds+xml, or both.
782 * If the X-XRDS-Location header was delivered, we know about it at this point...
784 if ( (x_xrds_location)
785 && (strcmp(ChrPtr(x_xrds_location), ChrPtr(SuppliedURL)))
787 syslog(LOG_DEBUG, "openid: X-XRDS-Location: %s ... recursing!", ChrPtr(x_xrds_location));
788 return_value = perform_openid2_discovery(x_xrds_location);
789 FreeStrBuf(&x_xrds_location);
793 * Option 4: the returned web page may *be* an XRDS document. Try to parse it.
795 if ( (return_value == 0) && (docbytes >= 0)) {
796 return_value = parse_xrds_document(ReplyBuf);
800 * Option 5: if all else fails, attempt HTML based discovery.
802 if ( (return_value == 0) && (docbytes >= 0)) {
803 if (oiddata->op_url == NULL) {
804 oiddata->op_url = NewStrBuf();
806 extract_link(oiddata->op_url, HKEY("openid2.provider"), ReplyBuf);
807 if (StrLength(oiddata->op_url) > 0) {
808 return_value = openid_disco_html;
812 if (ReplyBuf != NULL) {
813 FreeStrBuf(&ReplyBuf);
815 return(return_value);
820 * Setup an OpenID authentication
822 void cmd_oids(char *argbuf) {
823 struct CitContext *CCC = CC; /* CachedCitContext - performance boost */
824 const char *Pos = NULL;
825 StrBuf *ArgBuf = NULL;
826 StrBuf *ReplyBuf = NULL;
827 StrBuf *return_to = NULL;
828 StrBuf *RedirectUrl = NULL;
829 ctdl_openid *oiddata;
830 int discovery_succeeded = 0;
832 if (CtdlGetConfigInt("c_disable_newu"))
834 cprintf("%d this system does not support openid.\n",
835 ERROR + CMD_NOT_SUPPORTED);
838 Free_ctdl_openid ((ctdl_openid**)&CCC->openid_data);
840 CCC->openid_data = oiddata = malloc(sizeof(ctdl_openid));
841 if (oiddata == NULL) {
842 syslog(LOG_ERR, "openid: malloc() failed: %s", strerror(errno));
843 cprintf("%d malloc failed\n", ERROR + INTERNAL_ERROR);
846 memset(oiddata, 0, sizeof(ctdl_openid));
848 ArgBuf = NewStrBufPlain(argbuf, -1);
850 oiddata->verified = 0;
851 oiddata->claimed_id = NewStrBufPlain(NULL, StrLength(ArgBuf));
852 return_to = NewStrBufPlain(NULL, StrLength(ArgBuf));
854 StrBufExtract_NextToken(oiddata->claimed_id, ArgBuf, &Pos, '|');
855 StrBufExtract_NextToken(return_to, ArgBuf, &Pos, '|');
857 syslog(LOG_DEBUG, "openid: user-Supplied Identifier is: %s", ChrPtr(oiddata->claimed_id));
859 /********** OpenID 2.0 section 7.3 - Discovery **********/
861 /* Section 7.3.1 says we have to attempt XRI based discovery.
862 * No one is using this, no one is asking for it, no one wants it.
863 * So we're not even going to bother attempting this mode.
866 /* Attempt section 7.3.2 (Yadis discovery) and section 7.3.3 (HTML discovery);
868 discovery_succeeded = perform_openid2_discovery(oiddata->claimed_id);
870 if (discovery_succeeded == 0) {
871 cprintf("%d There is no OpenID identity provider at this location.\n", ERROR);
876 * If we get to this point we are in possession of a valid OpenID Provider URL.
878 syslog(LOG_DEBUG, "openid: OP URI '%s' discovered using method %d",
879 ChrPtr(oiddata->op_url),
883 /* We have to "normalize" our Claimed ID otherwise it will cause some OP's to barf */
884 if (cbmstrcasestr(ChrPtr(oiddata->claimed_id), "://") == NULL) {
885 StrBuf *cid = oiddata->claimed_id;
886 oiddata->claimed_id = NewStrBufPlain(HKEY("http://"));
887 StrBufAppendBuf(oiddata->claimed_id, cid, 0);
892 * OpenID 2.0 section 9: request authentication
893 * Assemble a URL to which the user-agent will be redirected.
896 RedirectUrl = NewStrBufDup(oiddata->op_url);
898 StrBufAppendBufPlain(RedirectUrl, HKEY("?openid.ns="), 0);
899 StrBufUrlescAppend(RedirectUrl, NULL, "http://specs.openid.net/auth/2.0");
901 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.mode=checkid_setup"), 0);
903 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.claimed_id="), 0);
904 StrBufUrlescAppend(RedirectUrl, oiddata->claimed_id, NULL);
906 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.identity="), 0);
907 StrBufUrlescAppend(RedirectUrl, oiddata->claimed_id, NULL);
909 /* return_to tells the provider how to complete the round trip back to our site */
910 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.return_to="), 0);
911 StrBufUrlescAppend(RedirectUrl, return_to, NULL);
913 /* Attribute Exchange
915 * http://openid.net/specs/openid-attribute-exchange-1_0.html
916 * http://code.google.com/apis/accounts/docs/OpenID.html#endpoint
917 * http://test-id.net/OP/AXFetch.aspx
920 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.ns.ax="), 0);
921 StrBufUrlescAppend(RedirectUrl, NULL, "http://openid.net/srv/ax/1.0");
923 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.ax.mode=fetch_request"), 0);
925 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.ax.required=firstname,lastname,friendly,nickname"), 0);
927 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.ax.type.firstname="), 0);
928 StrBufUrlescAppend(RedirectUrl, NULL, "http://axschema.org/namePerson/first");
930 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.ax.type.lastname="), 0);
931 StrBufUrlescAppend(RedirectUrl, NULL, "http://axschema.org/namePerson/last");
933 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.ax.type.friendly="), 0);
934 StrBufUrlescAppend(RedirectUrl, NULL, "http://axschema.org/namePerson/friendly");
936 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.ax.type.nickname="), 0);
937 StrBufUrlescAppend(RedirectUrl, NULL, "http://axschema.org/namePerson/nickname");
939 syslog(LOG_DEBUG, "openid: redirecting client to %s", ChrPtr(RedirectUrl));
940 cprintf("%d %s\n", CIT_OK, ChrPtr(RedirectUrl));
944 FreeStrBuf(&ReplyBuf);
945 FreeStrBuf(&return_to);
946 FreeStrBuf(&RedirectUrl);
951 * Finalize an OpenID authentication
953 void cmd_oidf(char *argbuf) {
958 HashList *keys = NULL;
961 ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
963 if (CtdlGetConfigInt("c_disable_newu"))
965 cprintf("%d this system does not support openid.\n",
966 ERROR + CMD_NOT_SUPPORTED);
969 if (oiddata == NULL) {
970 cprintf("%d run OIDS first.\n", ERROR + INTERNAL_ERROR);
973 if (StrLength(oiddata->op_url) == 0){
974 cprintf("%d No OpenID Endpoint URL has been obtained.\n", ERROR + ILLEGAL_VALUE);
977 keys = NewHash(1, NULL);
979 cprintf("%d NewHash() failed\n", ERROR + INTERNAL_ERROR);
982 cprintf("%d Transmit OpenID data now\n", START_CHAT_MODE);
984 while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
985 len = extract_token(thiskey, buf, 0, '|', sizeof thiskey);
987 len = sizeof(thiskey) - 1;
989 extract_token(thisdata, buf, 1, '|', sizeof thisdata);
990 Put(keys, thiskey, len, strdup(thisdata), NULL);
993 /* Check to see if this is a correct response.
994 * Start with verified=1 but then set it to 0 if anything looks wrong.
996 oiddata->verified = 1;
998 char *openid_ns = NULL;
999 if ( (!GetHash(keys, "ns", 2, (void *) &openid_ns))
1000 || (strcasecmp(openid_ns, "http://specs.openid.net/auth/2.0"))
1002 syslog(LOG_DEBUG, "openid: this is not an an OpenID assertion");
1003 oiddata->verified = 0;
1006 char *openid_mode = NULL;
1007 if ( (!GetHash(keys, "mode", 4, (void *) &openid_mode))
1008 || (strcasecmp(openid_mode, "id_res"))
1010 oiddata->verified = 0;
1013 char *openid_claimed_id = NULL;
1014 if (GetHash(keys, "claimed_id", 10, (void *) &openid_claimed_id)) {
1015 FreeStrBuf(&oiddata->claimed_id);
1016 oiddata->claimed_id = NewStrBufPlain(openid_claimed_id, -1);
1017 syslog(LOG_DEBUG, "openid: provider is asserting the Claimed ID '%s'", ChrPtr(oiddata->claimed_id));
1020 /* Validate the assertion against the server */
1021 syslog(LOG_DEBUG, "openid: validating...");
1025 struct curl_httppost *formpost = NULL;
1026 struct curl_httppost *lastptr = NULL;
1027 char errmsg[1024] = "";
1028 StrBuf *ReplyBuf = NewStrBuf();
1030 curl_formadd(&formpost, &lastptr,
1031 CURLFORM_COPYNAME, "openid.mode",
1032 CURLFORM_COPYCONTENTS, "check_authentication",
1036 HashPos *HashPos = GetNewHashPos(keys, 0);
1037 while (GetNextHashPos(keys, HashPos, &len, &Key, &Value) != 0) {
1038 if (strcasecmp(Key, "mode")) {
1039 char k_o_keyname[1024];
1040 snprintf(k_o_keyname, sizeof k_o_keyname, "openid.%s", (const char *)Key);
1041 curl_formadd(&formpost, &lastptr,
1042 CURLFORM_COPYNAME, k_o_keyname,
1043 CURLFORM_COPYCONTENTS, (char *)Value,
1048 DeleteHashPos(&HashPos);
1050 curl = ctdl_openid_curl_easy_init(errmsg);
1051 curl_easy_setopt(curl, CURLOPT_URL, ChrPtr(oiddata->op_url));
1052 curl_easy_setopt(curl, CURLOPT_WRITEDATA, ReplyBuf);
1053 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, CurlFillStrBuf_callback);
1054 curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
1056 res = curl_easy_perform(curl);
1058 syslog(LOG_DEBUG, "openid: cmd_oidf() libcurl error %d: %s", res, errmsg);
1059 oiddata->verified = 0;
1061 curl_easy_cleanup(curl);
1062 curl_formfree(formpost);
1064 if (cbmstrcasestr(ChrPtr(ReplyBuf), "is_valid:true") == NULL) {
1065 oiddata->verified = 0;
1067 FreeStrBuf(&ReplyBuf);
1069 syslog(LOG_DEBUG, "openid: authentication %s", (oiddata->verified ? "succeeded" : "failed") );
1071 /* Respond to the client */
1073 if (oiddata->verified) {
1075 /* If we were already logged in, attach the OpenID to the user's account */
1076 if (CC->logged_in) {
1077 if (attach_extauth(&CC->user, oiddata->claimed_id) == 0) {
1078 cprintf("attach\n");
1079 syslog(LOG_DEBUG, "openid: attach succeeded");
1083 syslog(LOG_DEBUG, "openid: attach failed");
1087 /* Otherwise, a user is attempting to log in using the verified OpenID */
1090 * Existing user who has claimed this OpenID?
1092 * Note: if you think that sending the password back over the wire is insecure,
1093 * check your assumptions. If someone has successfully asserted an OpenID that
1094 * is associated with the account, they already have password equivalency and can
1095 * login, so they could just as easily change the password, etc.
1097 if (login_via_extauth(oiddata->claimed_id) == 0) {
1098 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
1099 logged_in_response();
1100 syslog(LOG_DEBUG, "openid: logged in using previously claimed OpenID");
1104 * If this system does not allow self-service new user registration, the
1105 * remaining modes do not apply, so fail here and now.
1107 else if (CtdlGetConfigInt("c_disable_newu")) {
1109 syslog(LOG_DEBUG, "openid: creating user failed due to local policy");
1113 * New user whose OpenID is verified and Attribute Exchange gave us a name?
1115 else if (openid_create_user_via_ax(oiddata->claimed_id, keys) == 0) {
1116 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
1117 logged_in_response();
1118 syslog(LOG_DEBUG, "openid: successfully auto-created new user");
1122 * OpenID is verified, but the desired username either was not specified or
1123 * conflicts with an existing user. Manual account creation is required.
1126 char *desired_name = NULL;
1127 cprintf("verify_only\n");
1128 cprintf("%s\n", ChrPtr(oiddata->claimed_id));
1129 if (GetHash(keys, "sreg.nickname", 13, (void *) &desired_name)) {
1130 cprintf("%s\n", desired_name);
1135 syslog(LOG_DEBUG, "openid: the desired display name is already taken.");
1144 if (oiddata->sreg_keys != NULL) {
1145 DeleteHash(&oiddata->sreg_keys);
1146 oiddata->sreg_keys = NULL;
1148 oiddata->sreg_keys = keys;
1153 /**************************************************************************/
1155 /* Functions in this section handle module initialization and shutdown */
1157 /**************************************************************************/
1162 CTDL_MODULE_INIT(openid_rp)
1166 /* Only enable the OpenID command set when native mode authentication is in use. */
1167 if (CtdlGetConfigInt("c_auth_mode") == AUTHMODE_NATIVE) {
1168 CtdlRegisterProtoHook(cmd_oids, "OIDS", "Setup OpenID authentication");
1169 CtdlRegisterProtoHook(cmd_oidf, "OIDF", "Finalize OpenID authentication");
1170 CtdlRegisterProtoHook(cmd_oidl, "OIDL", "List OpenIDs associated with an account");
1171 CtdlRegisterProtoHook(cmd_oidd, "OIDD", "Detach an OpenID from an account");
1172 CtdlRegisterProtoHook(cmd_oidc, "OIDC", "Create new user after validating OpenID");
1173 CtdlRegisterProtoHook(cmd_oida, "OIDA", "List all OpenIDs in the database");
1175 CtdlRegisterSessionHook(openid_cleanup_function, EVT_LOGOUT, PRIO_LOGOUT + 10);
1176 CtdlRegisterUserHook(extauth_purge, EVT_PURGEUSER);
1177 openid_level_supported = 1; /* This module supports OpenID 1.0 only */
1180 /* return our module name for the log */