citadel
About: Citadel is an advanced messaging and collaboration system for groupware and BBS applications (preferred OS: Linux).
  Fossies Dox: citadel.tar.gz  ("unofficial" and yet experimental doxygen-generated source code documentation)  

serv_openid_rp.c
Go to the documentation of this file.
1/*
2 * This is an implementation of OpenID 2.0 relying party support in stateless mode.
3 *
4 * Copyright (c) 2007-2020 by the citadel.org team
5 *
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.
10 *
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.
15 *
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/>.
18 */
19
20#include "sysdep.h"
21#include <stdlib.h>
22#include <unistd.h>
23#include <stdio.h>
24#include <fcntl.h>
25#include <signal.h>
26#include <pwd.h>
27#include <errno.h>
28#include <sys/types.h>
29#include <time.h>
30#include <sys/wait.h>
31#include <string.h>
32#include <limits.h>
33#include <curl/curl.h>
34#include <expat.h>
35#include "ctdl_module.h"
36#include "config.h"
37#include "citserver.h"
38#include "user_ops.h"
39
40typedef struct _ctdl_openid {
41 StrBuf *op_url; /* OpenID Provider Endpoint URL */
42 StrBuf *claimed_id; /* Claimed Identifier */
44 HashList *sreg_keys;
46
47enum {
51};
52
53
55{
56 if (*FreeMe == NULL) {
57 return;
58 }
59 FreeStrBuf(&(*FreeMe)->op_url);
60 FreeStrBuf(&(*FreeMe)->claimed_id);
61 DeleteHash(&(*FreeMe)->sreg_keys);
62 free(*FreeMe);
63 *FreeMe = NULL;
64}
65
66
67/*
68 * This cleanup function blows away the temporary memory used by this module.
69 */
71 struct CitContext *CCC = CC; /* CachedCitContext - performance boost */
72
73 if (CCC->openid_data != NULL) {
74 syslog(LOG_DEBUG, "openid: Clearing OpenID session state");
76 }
77}
78
79
80/**************************************************************************/
81/* */
82/* Functions in this section handle Citadel internal OpenID mapping stuff */
83/* */
84/**************************************************************************/
85
86
87/*
88 * The structure of an openid record *key* is:
89 *
90 * |--------------claimed_id-------------|
91 * (actual length of claimed id)
92 *
93 *
94 * The structure of an openid record *value* is:
95 *
96 * |-----user_number----|------------claimed_id---------------|
97 * (sizeof long) (actual length of claimed id)
98 *
99 */
100
101
102
103/*
104 * Attach an external authenticator (such as an OpenID) to a Citadel account
105 */
106int attach_extauth(struct ctdluser *who, StrBuf *claimed_id)
107{
108 struct cdbdata *cdboi;
109 long fetched_usernum;
110 char *data;
111 int data_len;
112 char buf[2048];
113
114 if (!who) return(1);
115 if (StrLength(claimed_id)==0) return(1);
116
117 /* Check to see if this authenticator is already in the database */
118
119 cdboi = cdb_fetch(CDB_EXTAUTH, ChrPtr(claimed_id), StrLength(claimed_id));
120 if (cdboi != NULL) {
121 memcpy(&fetched_usernum, cdboi->ptr, sizeof(long));
122 cdb_free(cdboi);
123
124 if (fetched_usernum == who->usernum) {
125 syslog(LOG_INFO, "openid: %s already associated; no action is taken", ChrPtr(claimed_id));
126 return(0);
127 }
128 else {
129 syslog(LOG_INFO, "openid: %s already belongs to another user", ChrPtr(claimed_id));
130 return(3);
131 }
132 }
133
134 /* Not already in the database, so attach it now */
135
136 data_len = sizeof(long) + StrLength(claimed_id) + 1;
137 data = malloc(data_len);
138
139 memcpy(data, &who->usernum, sizeof(long));
140 memcpy(&data[sizeof(long)], ChrPtr(claimed_id), StrLength(claimed_id) + 1);
141
142 cdb_store(CDB_EXTAUTH, ChrPtr(claimed_id), StrLength(claimed_id), data, data_len);
143 free(data);
144
145 snprintf(buf, sizeof buf, "User <%s> (#%ld) is now associated with %s\n", who->fullname, who->usernum, ChrPtr(claimed_id));
146 CtdlAideMessage(buf, "External authenticator claim");
147 syslog(LOG_INFO, "openid: %s", buf);
148 return(0);
149}
150
151
152/*
153 * When a user is being deleted, we have to delete any OpenID associations
154 */
156 struct cdbdata *cdboi;
157 HashList *keys = NULL;
158 HashPos *HashPos;
159 char *deleteme = NULL;
160 long len;
161 void *Value;
162 const char *Key;
163 long usernum = 0L;
164
165 keys = NewHash(1, NULL);
166 if (!keys) return;
167
169 while (cdboi = cdb_next_item(CDB_EXTAUTH), cdboi != NULL) {
170 if (cdboi->len > sizeof(long)) {
171 memcpy(&usernum, cdboi->ptr, sizeof(long));
172 if (usernum == usbuf->usernum) {
173 deleteme = strdup(cdboi->ptr + sizeof(long)),
174 Put(keys, deleteme, strlen(deleteme), deleteme, NULL);
175 }
176 }
177 cdb_free(cdboi);
178 }
179
180 /* Go through the hash list, deleting keys we stored in it */
181
182 HashPos = GetNewHashPos(keys, 0);
183 while (GetNextHashPos(keys, HashPos, &len, &Key, &Value)!=0)
184 {
185 syslog(LOG_DEBUG, "openid: deleting associated external authenticator <%s>", (char*)Value);
186 cdb_delete(CDB_EXTAUTH, Value, strlen(Value));
187 /* note: don't free(Value) -- deleting the hash list will handle this for us */
188 }
189 DeleteHashPos(&HashPos);
190 DeleteHash(&keys);
191}
192
193
194/*
195 * List the OpenIDs associated with the currently logged in account
196 */
197void cmd_oidl(char *argbuf) {
198 struct cdbdata *cdboi;
199 long usernum = 0L;
200
201 if (CtdlGetConfigInt("c_disable_newu"))
202 {
203 cprintf("%d this system does not support openid.\n", ERROR + CMD_NOT_SUPPORTED);
204 return;
205 }
206 if (CtdlAccessCheck(ac_logged_in)) return;
207
209 cprintf("%d Associated external authenticators:\n", LISTING_FOLLOWS);
210
211 while (cdboi = cdb_next_item(CDB_EXTAUTH), cdboi != NULL) {
212 if (cdboi->len > sizeof(long)) {
213 memcpy(&usernum, cdboi->ptr, sizeof(long));
214 if (usernum == CC->user.usernum) {
215 cprintf("%s\n", cdboi->ptr + sizeof(long));
216 }
217 }
218 cdb_free(cdboi);
219 }
220 cprintf("000\n");
221}
222
223
224/*
225 * List ALL OpenIDs in the database
226 */
227void cmd_oida(char *argbuf) {
228 struct cdbdata *cdboi;
229 long usernum;
230 struct ctdluser usbuf;
231
232 if (CtdlGetConfigInt("c_disable_newu"))
233 {
234 cprintf("%d this system does not support openid.\n",
236 return;
237 }
238 if (CtdlAccessCheck(ac_aide)) return;
240 cprintf("%d List of all OpenIDs in the database:\n", LISTING_FOLLOWS);
241
242 while (cdboi = cdb_next_item(CDB_EXTAUTH), cdboi != NULL) {
243 if (cdboi->len > sizeof(long)) {
244 memcpy(&usernum, cdboi->ptr, sizeof(long));
245 if (CtdlGetUserByNumber(&usbuf, usernum) != 0) {
246 usbuf.fullname[0] = 0;
247 }
248 cprintf("%s|%ld|%s\n",
249 cdboi->ptr + sizeof(long),
250 usernum,
252 );
253 }
254 cdb_free(cdboi);
255 }
256 cprintf("000\n");
257}
258
259
260/*
261 * Create a new user account, manually specifying the name, after successfully
262 * verifying an OpenID (which will of course be attached to the account)
263 */
264void cmd_oidc(char *argbuf) {
265 ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
266
267 if (CtdlGetConfigInt("c_disable_newu"))
268 {
269 cprintf("%d this system does not support openid.\n",
271 return;
272 }
273 if ( (!oiddata) || (!oiddata->verified) ) {
274 cprintf("%d You have not verified an OpenID yet.\n", ERROR);
275 return;
276 }
277
278 /* We can make the semantics of OIDC exactly the same as NEWU, simply
279 * by _calling_ cmd_newu() and letting it run. Very clever!
280 */
281 cmd_newu(argbuf);
282
283 /* Now, if this logged us in, we have to attach the OpenID */
284 if (CC->logged_in) {
285 attach_extauth(&CC->user, oiddata->claimed_id);
286 }
287
288}
289
290
291/*
292 * Detach an OpenID from the currently logged in account
293 */
294void cmd_oidd(char *argbuf) {
295 struct cdbdata *cdboi;
296 char id_to_detach[1024];
297 int this_is_mine = 0;
298 long usernum = 0L;
299
300 if (CtdlGetConfigInt("c_disable_newu"))
301 {
302 cprintf("%d this system does not support openid.\n",
304 return;
305 }
306 if (CtdlAccessCheck(ac_logged_in)) return;
307 extract_token(id_to_detach, argbuf, 0, '|', sizeof id_to_detach);
308 if (IsEmptyStr(id_to_detach)) {
309 cprintf("%d An empty OpenID URL is not allowed.\n", ERROR + ILLEGAL_VALUE);
310 }
311
313 while (cdboi = cdb_next_item(CDB_EXTAUTH), cdboi != NULL) {
314 if (cdboi->len > sizeof(long)) {
315 memcpy(&usernum, cdboi->ptr, sizeof(long));
316 if (usernum == CC->user.usernum) {
317 this_is_mine = 1;
318 }
319 }
320 cdb_free(cdboi);
321 }
322
323 if (!this_is_mine) {
324 cprintf("%d That OpenID was not found or not associated with your account.\n",
326 return;
327 }
328
329 cdb_delete(CDB_EXTAUTH, id_to_detach, strlen(id_to_detach));
330 cprintf("%d %s detached from your account.\n", CIT_OK, id_to_detach);
331}
332
333
334/*
335 * Attempt to auto-create a new Citadel account using the nickname from Attribute Exchange
336 */
337int openid_create_user_via_ax(StrBuf *claimed_id, HashList *sreg_keys)
338{
339 char *nickname = NULL;
340 char *firstname = NULL;
341 char *lastname = NULL;
342 char new_password[32];
343 long len;
344 const char *Key;
345 void *Value;
346
347 if (CtdlGetConfigInt("c_auth_mode") != AUTHMODE_NATIVE) return(1);
348 if (CtdlGetConfigInt("c_disable_newu")) return(2);
349 if (CC->logged_in) return(3);
350
351 HashPos *HashPos = GetNewHashPos(sreg_keys, 0);
352 while (GetNextHashPos(sreg_keys, HashPos, &len, &Key, &Value) != 0) {
353 syslog(LOG_DEBUG, "openid: %s = %s", Key, (char *)Value);
354
355 if (cbmstrcasestr(Key, "value.nickname") != NULL) {
356 nickname = (char *)Value;
357 }
358 else if ( (nickname == NULL) && (cbmstrcasestr(Key, "value.nickname") != NULL)) {
359 nickname = (char *)Value;
360 }
361 else if (cbmstrcasestr(Key, "value.firstname") != NULL) {
362 firstname = (char *)Value;
363 }
364 else if (cbmstrcasestr(Key, "value.lastname") != NULL) {
365 lastname = (char *)Value;
366 }
367
368 }
369 DeleteHashPos(&HashPos);
370
371 if (nickname == NULL) {
372 if ((firstname != NULL) || (lastname != NULL)) {
373 char fullname[1024] = "";
374 if (firstname) strcpy(fullname, firstname);
375 if (firstname && lastname) strcat(fullname, " ");
376 if (lastname) strcat(fullname, lastname);
377 nickname = fullname;
378 }
379 }
380
381 if (nickname == NULL) {
382 return(4);
383 }
384 syslog(LOG_DEBUG, "openid: the desired account name is <%s>", nickname);
385
386 if (!CtdlGetUser(&CC->user, nickname)) {
387 syslog(LOG_DEBUG, "openid: <%s> is already taken by another user.", nickname);
388 memset(&CC->user, 0, sizeof(struct ctdluser));
389 return(5);
390 }
391
392 /* The desired account name is available. Create the account and log it in! */
393 if (create_user(nickname, CREATE_USER_BECOME_USER, NATIVE_AUTH_UID)) return(6);
394
395 /* Generate a random password.
396 * The user doesn't care what the password is since he is using OpenID.
397 */
398 snprintf(new_password, sizeof new_password, "%08lx%08lx", random(), random());
399 CtdlSetPassword(new_password);
400
401 /* Now attach the verified OpenID to this account. */
402 attach_extauth(&CC->user, claimed_id);
403
404 return(0);
405}
406
407
408/*
409 * If a user account exists which is associated with the Claimed ID, log it in and return zero.
410 * Otherwise it returns nonzero.
411 */
412int login_via_extauth(StrBuf *claimed_id)
413{
414 struct cdbdata *cdboi;
415 long usernum = 0;
416
417 cdboi = cdb_fetch(CDB_EXTAUTH, ChrPtr(claimed_id), StrLength(claimed_id));
418 if (cdboi == NULL) {
419 return(-1);
420 }
421
422 memcpy(&usernum, cdboi->ptr, sizeof(long));
423 cdb_free(cdboi);
424
425 if (!CtdlGetUserByNumber(&CC->user, usernum)) {
426 /* Now become the user we just created */
427 safestrncpy(CC->curr_user, CC->user.fullname, sizeof CC->curr_user);
428 do_login();
429 return(0);
430 }
431 else {
432 memset(&CC->user, 0, sizeof(struct ctdluser));
433 return(-1);
434 }
435}
436
437
438
439
440/**************************************************************************/
441/* */
442/* Functions in this section handle OpenID protocol */
443/* */
444/**************************************************************************/
445
446
447/*
448 * Locate a <link> tag and, given its 'rel=' parameter, return its 'href' parameter
449 */
450void extract_link(StrBuf *target_buf, const char *rel, long repllen, StrBuf *source_buf)
451{
452 int i;
453 const char *ptr;
454 const char *href_start = NULL;
455 const char *href_end = NULL;
456 const char *link_tag_start = NULL;
457 const char *link_tag_end = NULL;
458 const char *rel_start = NULL;
459 const char *rel_end = NULL;
460
461 if (!target_buf) return;
462 if (!rel) return;
463 if (!source_buf) return;
464
465 ptr = ChrPtr(source_buf);
466
467 FlushStrBuf(target_buf);
468 while (ptr = cbmstrcasestr(ptr, "<link"), ptr != NULL) {
469
470 link_tag_start = ptr;
471 link_tag_end = strchr(ptr, '>');
472 if (link_tag_end == NULL)
473 break;
474 for (i=0; i < 1; i++ ){
475 rel_start = cbmstrcasestr(link_tag_start, "rel=");
476 if ((rel_start == NULL) ||
477 (rel_start > link_tag_end))
478 continue;
479
480 rel_start = strchr(rel_start, '\"');
481 if ((rel_start == NULL) ||
482 (rel_start > link_tag_end))
483 continue;
484 ++rel_start;
485 rel_end = strchr(rel_start, '\"');
486 if ((rel_end == NULL) ||
487 (rel_end == rel_start) ||
488 (rel_end >= link_tag_end) )
489 continue;
490 if (strncasecmp(rel, rel_start, repllen)!= 0)
491 continue; /* didn't match? never mind... */
492
493 href_start = cbmstrcasestr(link_tag_start, "href=");
494 if ((href_start == NULL) ||
495 (href_start >= link_tag_end))
496 continue;
497 href_start = strchr(href_start, '\"');
498 if ((href_start == NULL) |
499 (href_start >= link_tag_end))
500 continue;
501 ++href_start;
502 href_end = strchr(href_start, '\"');
503 if ((href_end == NULL) ||
504 (href_end == href_start) ||
505 (href_start >= link_tag_end))
506 continue;
507 StrBufPlain(target_buf, href_start, href_end - href_start);
508 }
509 ptr = link_tag_end;
510 }
511}
512
513
514/*
515 * Wrapper for curl_easy_init() that includes the options common to all calls
516 * used in this module.
517 */
518CURL *ctdl_openid_curl_easy_init(char *errmsg) {
519 CURL *curl;
520
521 curl = curl_easy_init();
522 if (!curl) {
523 return(curl);
524 }
525
526 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
527 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
528
529 if (errmsg) {
530 curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
531 }
532 curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
533#ifdef CURLOPT_HTTP_CONTENT_DECODING
534 curl_easy_setopt(curl, CURLOPT_HTTP_CONTENT_DECODING, 1);
535 curl_easy_setopt(curl, CURLOPT_ENCODING, "");
536#endif
537 curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
538 curl_easy_setopt(curl, CURLOPT_TIMEOUT, 30); /* die after 30 seconds */
539
540 if (
541 (!IsEmptyStr(CtdlGetConfigStr("c_ip_addr")))
542 && (strcmp(CtdlGetConfigStr("c_ip_addr"), "*"))
543 && (strcmp(CtdlGetConfigStr("c_ip_addr"), "::"))
544 && (strcmp(CtdlGetConfigStr("c_ip_addr"), "0.0.0.0"))
545 ) {
546 curl_easy_setopt(curl, CURLOPT_INTERFACE, CtdlGetConfigStr("c_ip_addr"));
547 }
548
549 return(curl);
550}
551
552
553struct xrds {
554 StrBuf *CharData;
562};
563
564
565void xrds_xml_start(void *data, const char *supplied_el, const char **attr) {
566 struct xrds *xrds = (struct xrds *) data;
567 int i;
568
570
571 if (!strcasecmp(supplied_el, "XRD")) {
572 ++xrds->in_xrd;
573 }
574
575 else if (!strcasecmp(supplied_el, "service")) {
578 for (i=0; attr[i] != NULL; i+=2) {
579 if (!strcasecmp(attr[i], "priority")) {
580 xrds->current_service_priority = atoi(attr[i+1]);
581 }
582 }
583 }
584
585 FlushStrBuf(xrds->CharData);
586}
587
588
589void xrds_xml_end(void *data, const char *supplied_el) {
590 struct xrds *xrds = (struct xrds *) data;
591
593
594 if (!strcasecmp(supplied_el, "XRD")) {
595 --xrds->in_xrd;
596 }
597
598 else if (!strcasecmp(supplied_el, "type")) {
599 if ( (xrds->in_xrd)
600 && (!strcasecmp(ChrPtr(xrds->CharData), "http://specs.openid.net/auth/2.0/server"))
601 ) {
603 }
604 if ( (xrds->in_xrd)
605 && (!strcasecmp(ChrPtr(xrds->CharData), "http://specs.openid.net/auth/2.0/signon"))
606 ) {
608 /* FIXME in this case, the Claimed ID should be considered immutable */
609 }
610 }
611
612 else if (!strcasecmp(supplied_el, "uri")) {
613 if (xrds->in_xrd) {
614 FlushStrBuf(xrds->current_service_uri);
615 StrBufAppendBuf(xrds->current_service_uri, xrds->CharData, 0);
616 }
617 }
618
619 else if (!strcasecmp(supplied_el, "service")) {
620 if ( (xrds->in_xrd)
623 ) {
625 FlushStrBuf(xrds->selected_service_uri);
626 StrBufAppendBuf(xrds->selected_service_uri, xrds->current_service_uri, 0);
627 }
628
629 }
630
631 FlushStrBuf(xrds->CharData);
632}
633
634
635void xrds_xml_chardata(void *data, const XML_Char *s, int len) {
636 struct xrds *xrds = (struct xrds *) data;
637
638 StrBufAppendBufPlain (xrds->CharData, s, len, 0);
639}
640
641
642/*
643 * Parse an XRDS document.
644 * If an OpenID Provider URL is discovered, op_url to that value and return nonzero.
645 * If nothing useful happened, return 0.
646 */
647int parse_xrds_document(StrBuf *ReplyBuf) {
648 ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
649 struct xrds xrds;
650 int return_value = 0;
651
652 memset(&xrds, 0, sizeof (struct xrds));
654 xrds.CharData = NewStrBuf();
655 xrds.current_service_uri = NewStrBuf();
656 xrds.selected_service_uri = NewStrBuf();
657 XML_Parser xp = XML_ParserCreate(NULL);
658 if (xp) {
659 XML_SetUserData(xp, &xrds);
660 XML_SetElementHandler(xp, xrds_xml_start, xrds_xml_end);
661 XML_SetCharacterDataHandler(xp, xrds_xml_chardata);
662 XML_Parse(xp, ChrPtr(ReplyBuf), StrLength(ReplyBuf), 0);
663 XML_Parse(xp, "", 0, 1);
664 XML_ParserFree(xp);
665 }
666 else {
667 syslog(LOG_ERR, "openid: cannot create XML parser");
668 }
669
670 if (xrds.selected_service_priority < INT_MAX) {
671 if (oiddata->op_url == NULL) {
672 oiddata->op_url = NewStrBuf();
673 }
674 FlushStrBuf(oiddata->op_url);
675 StrBufAppendBuf(oiddata->op_url, xrds.selected_service_uri, 0);
676 return_value = openid_disco_xrds;
677 }
678
679 FreeStrBuf(&xrds.CharData);
680 FreeStrBuf(&xrds.current_service_uri);
681 FreeStrBuf(&xrds.selected_service_uri);
682
683 return(return_value);
684}
685
686
687/*
688 * Callback function for perform_openid2_discovery()
689 * We're interested in the X-XRDS-Location: header.
690 */
691size_t yadis_headerfunction(void *ptr, size_t size, size_t nmemb, void *userdata) {
692 char hdr[1024];
693 StrBuf **x_xrds_location = (StrBuf **) userdata;
694
695 memcpy(hdr, ptr, (size*nmemb));
696 hdr[size*nmemb] = 0;
697
698 if (!strncasecmp(hdr, "X-XRDS-Location:", 16)) {
699 *x_xrds_location = NewStrBufPlain(&hdr[16], ((size*nmemb)-16));
700 StrBufTrim(*x_xrds_location);
701 }
702
703 return(size * nmemb);
704}
705
706
707/* Attempt to perform Yadis discovery as specified in Yadis 1.0 section 6.2.5.
708 *
709 * If Yadis fails, we then attempt HTML discovery using the same document.
710 *
711 * If successful, returns nonzero and calls parse_xrds_document() to act upon the received data.
712 * If fails, returns 0 and does nothing else.
713 */
714int perform_openid2_discovery(StrBuf *SuppliedURL) {
715 ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
716 int docbytes = (-1);
717 StrBuf *ReplyBuf = NULL;
718 int return_value = 0;
719 CURL *curl;
720 CURLcode result;
721 char errmsg[1024] = "";
722 struct curl_slist *my_headers = NULL;
723 StrBuf *x_xrds_location = NULL;
724
725 if (!SuppliedURL) return(0);
726 syslog(LOG_DEBUG, "openid: perform_openid2_discovery(%s)", ChrPtr(SuppliedURL));
727 if (StrLength(SuppliedURL) == 0) return(0);
728
729 ReplyBuf = NewStrBuf();
730 if (!ReplyBuf) return(0);
731
732 curl = ctdl_openid_curl_easy_init(errmsg);
733 if (!curl) return(0);
734
735 curl_easy_setopt(curl, CURLOPT_URL, ChrPtr(SuppliedURL));
736 curl_easy_setopt(curl, CURLOPT_WRITEDATA, ReplyBuf);
737 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, CurlFillStrBuf_callback);
738
739 my_headers = curl_slist_append(my_headers, "Accept:"); /* disable the default Accept: header */
740 my_headers = curl_slist_append(my_headers, "Accept: application/xrds+xml");
741 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, my_headers);
742
743 curl_easy_setopt(curl, CURLOPT_WRITEHEADER, &x_xrds_location);
744 curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, yadis_headerfunction);
745
746 result = curl_easy_perform(curl);
747 if (result) {
748 syslog(LOG_DEBUG, "openid: libcurl error %d: %s", result, errmsg);
749 }
750 curl_slist_free_all(my_headers);
751 curl_easy_cleanup(curl);
752 docbytes = StrLength(ReplyBuf);
753
754 /*
755 * The response from the server will be one of:
756 *
757 * Option 1: An HTML document with a <head> element that includes a <meta> element with http-equiv
758 * attribute, X-XRDS-Location,
759 *
760 * Does any provider actually do this? If so then we will implement it in the future.
761 */
762
763 /*
764 * Option 2: HTTP response-headers that include an X-XRDS-Location response-header,
765 * together with a document.
766 * Option 3: HTTP response-headers only, which MAY include an X-XRDS-Location response-header,
767 * a contenttype response-header specifying MIME media type,
768 * application/xrds+xml, or both.
769 *
770 * If the X-XRDS-Location header was delivered, we know about it at this point...
771 */
772 if ( (x_xrds_location)
773 && (strcmp(ChrPtr(x_xrds_location), ChrPtr(SuppliedURL)))
774 ) {
775 syslog(LOG_DEBUG, "openid: X-XRDS-Location: %s ... recursing!", ChrPtr(x_xrds_location));
776 return_value = perform_openid2_discovery(x_xrds_location);
777 FreeStrBuf(&x_xrds_location);
778 }
779
780 /*
781 * Option 4: the returned web page may *be* an XRDS document. Try to parse it.
782 */
783 if ( (return_value == 0) && (docbytes >= 0)) {
784 return_value = parse_xrds_document(ReplyBuf);
785 }
786
787 /*
788 * Option 5: if all else fails, attempt HTML based discovery.
789 */
790 if ( (return_value == 0) && (docbytes >= 0)) {
791 if (oiddata->op_url == NULL) {
792 oiddata->op_url = NewStrBuf();
793 }
794 extract_link(oiddata->op_url, HKEY("openid2.provider"), ReplyBuf);
795 if (StrLength(oiddata->op_url) > 0) {
796 return_value = openid_disco_html;
797 }
798 }
799
800 if (ReplyBuf != NULL) {
801 FreeStrBuf(&ReplyBuf);
802 }
803 return(return_value);
804}
805
806
807/*
808 * Setup an OpenID authentication
809 */
810void cmd_oids(char *argbuf) {
811 struct CitContext *CCC = CC; /* CachedCitContext - performance boost */
812 const char *Pos = NULL;
813 StrBuf *ArgBuf = NULL;
814 StrBuf *ReplyBuf = NULL;
815 StrBuf *return_to = NULL;
816 StrBuf *RedirectUrl = NULL;
817 ctdl_openid *oiddata;
818 int discovery_succeeded = 0;
819
820 if (CtdlGetConfigInt("c_disable_newu"))
821 {
822 cprintf("%d this system does not support openid.\n",
824 return;
825 }
827
828 CCC->openid_data = oiddata = malloc(sizeof(ctdl_openid));
829 if (oiddata == NULL) {
830 syslog(LOG_ERR, "openid: malloc() failed: %m");
831 cprintf("%d malloc failed\n", ERROR + INTERNAL_ERROR);
832 return;
833 }
834 memset(oiddata, 0, sizeof(ctdl_openid));
835
836 ArgBuf = NewStrBufPlain(argbuf, -1);
837
838 oiddata->verified = 0;
839 oiddata->claimed_id = NewStrBufPlain(NULL, StrLength(ArgBuf));
840 return_to = NewStrBufPlain(NULL, StrLength(ArgBuf));
841
842 StrBufExtract_NextToken(oiddata->claimed_id, ArgBuf, &Pos, '|');
843 StrBufExtract_NextToken(return_to, ArgBuf, &Pos, '|');
844
845 syslog(LOG_DEBUG, "openid: user-Supplied Identifier is: %s", ChrPtr(oiddata->claimed_id));
846
847 /********** OpenID 2.0 section 7.3 - Discovery **********/
848
849 /* Section 7.3.1 says we have to attempt XRI based discovery.
850 * No one is using this, no one is asking for it, no one wants it.
851 * So we're not even going to bother attempting this mode.
852 */
853
854 /* Attempt section 7.3.2 (Yadis discovery) and section 7.3.3 (HTML discovery);
855 */
856 discovery_succeeded = perform_openid2_discovery(oiddata->claimed_id);
857
858 if (discovery_succeeded == 0) {
859 cprintf("%d There is no OpenID identity provider at this location.\n", ERROR);
860 }
861
862 else {
863 /*
864 * If we get to this point we are in possession of a valid OpenID Provider URL.
865 */
866 syslog(LOG_DEBUG, "openid: OP URI '%s' discovered using method %d",
867 ChrPtr(oiddata->op_url),
868 discovery_succeeded
869 );
870
871 /* We have to "normalize" our Claimed ID otherwise it will cause some OP's to barf */
872 if (cbmstrcasestr(ChrPtr(oiddata->claimed_id), "://") == NULL) {
873 StrBuf *cid = oiddata->claimed_id;
874 oiddata->claimed_id = NewStrBufPlain(HKEY("http://"));
875 StrBufAppendBuf(oiddata->claimed_id, cid, 0);
876 FreeStrBuf(&cid);
877 }
878
879 /*
880 * OpenID 2.0 section 9: request authentication
881 * Assemble a URL to which the user-agent will be redirected.
882 */
883
884 RedirectUrl = NewStrBufDup(oiddata->op_url);
885
886 StrBufAppendBufPlain(RedirectUrl, HKEY("?openid.ns="), 0);
887 StrBufUrlescAppend(RedirectUrl, NULL, "http://specs.openid.net/auth/2.0");
888
889 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.mode=checkid_setup"), 0);
890
891 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.claimed_id="), 0);
892 StrBufUrlescAppend(RedirectUrl, oiddata->claimed_id, NULL);
893
894 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.identity="), 0);
895 StrBufUrlescAppend(RedirectUrl, oiddata->claimed_id, NULL);
896
897 /* return_to tells the provider how to complete the round trip back to our site */
898 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.return_to="), 0);
899 StrBufUrlescAppend(RedirectUrl, return_to, NULL);
900
901 /* Attribute Exchange
902 * See:
903 * http://openid.net/specs/openid-attribute-exchange-1_0.html
904 * http://code.google.com/apis/accounts/docs/OpenID.html#endpoint
905 * http://test-id.net/OP/AXFetch.aspx
906 */
907
908 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.ns.ax="), 0);
909 StrBufUrlescAppend(RedirectUrl, NULL, "http://openid.net/srv/ax/1.0");
910
911 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.ax.mode=fetch_request"), 0);
912
913 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.ax.required=firstname,lastname,friendly,nickname"), 0);
914
915 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.ax.type.firstname="), 0);
916 StrBufUrlescAppend(RedirectUrl, NULL, "http://axschema.org/namePerson/first");
917
918 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.ax.type.lastname="), 0);
919 StrBufUrlescAppend(RedirectUrl, NULL, "http://axschema.org/namePerson/last");
920
921 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.ax.type.friendly="), 0);
922 StrBufUrlescAppend(RedirectUrl, NULL, "http://axschema.org/namePerson/friendly");
923
924 StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.ax.type.nickname="), 0);
925 StrBufUrlescAppend(RedirectUrl, NULL, "http://axschema.org/namePerson/nickname");
926
927 syslog(LOG_DEBUG, "openid: redirecting client to %s", ChrPtr(RedirectUrl));
928 cprintf("%d %s\n", CIT_OK, ChrPtr(RedirectUrl));
929 }
930
931 FreeStrBuf(&ArgBuf);
932 FreeStrBuf(&ReplyBuf);
933 FreeStrBuf(&return_to);
934 FreeStrBuf(&RedirectUrl);
935}
936
937
938/*
939 * Finalize an OpenID authentication
940 */
941void cmd_oidf(char *argbuf) {
942 long len;
943 char buf[2048];
944 char thiskey[1024];
945 char thisdata[1024];
946 HashList *keys = NULL;
947 const char *Key;
948 void *Value;
949 ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
950
951 if (CtdlGetConfigInt("c_disable_newu"))
952 {
953 cprintf("%d this system does not support openid.\n",
955 return;
956 }
957 if (oiddata == NULL) {
958 cprintf("%d run OIDS first.\n", ERROR + INTERNAL_ERROR);
959 return;
960 }
961 if (StrLength(oiddata->op_url) == 0){
962 cprintf("%d No OpenID Endpoint URL has been obtained.\n", ERROR + ILLEGAL_VALUE);
963 return;
964 }
965 keys = NewHash(1, NULL);
966 if (!keys) {
967 cprintf("%d NewHash() failed\n", ERROR + INTERNAL_ERROR);
968 return;
969 }
970 cprintf("%d Transmit OpenID data now\n", START_CHAT_MODE);
971
972 while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
973 len = extract_token(thiskey, buf, 0, '|', sizeof thiskey);
974 if (len < 0) {
975 len = sizeof(thiskey) - 1;
976 }
977 extract_token(thisdata, buf, 1, '|', sizeof thisdata);
978 Put(keys, thiskey, len, strdup(thisdata), NULL);
979 }
980
981 /* Check to see if this is a correct response.
982 * Start with verified=1 but then set it to 0 if anything looks wrong.
983 */
984 oiddata->verified = 1;
985
986 char *openid_ns = NULL;
987 if ( (!GetHash(keys, "ns", 2, (void *) &openid_ns))
988 || (strcasecmp(openid_ns, "http://specs.openid.net/auth/2.0"))
989 ) {
990 syslog(LOG_DEBUG, "openid: this is not an an OpenID assertion");
991 oiddata->verified = 0;
992 }
993
994 char *openid_mode = NULL;
995 if ( (!GetHash(keys, "mode", 4, (void *) &openid_mode))
996 || (strcasecmp(openid_mode, "id_res"))
997 ) {
998 oiddata->verified = 0;
999 }
1000
1001 char *openid_claimed_id = NULL;
1002 if (GetHash(keys, "claimed_id", 10, (void *) &openid_claimed_id)) {
1003 FreeStrBuf(&oiddata->claimed_id);
1004 oiddata->claimed_id = NewStrBufPlain(openid_claimed_id, -1);
1005 syslog(LOG_DEBUG, "openid: provider is asserting the Claimed ID '%s'", ChrPtr(oiddata->claimed_id));
1006 }
1007
1008 /* Validate the assertion against the server */
1009 syslog(LOG_DEBUG, "openid: validating...");
1010
1011 CURL *curl;
1012 CURLcode res;
1013 struct curl_httppost *formpost = NULL;
1014 struct curl_httppost *lastptr = NULL;
1015 char errmsg[1024] = "";
1016 StrBuf *ReplyBuf = NewStrBuf();
1017
1018 curl_formadd(&formpost, &lastptr,
1019 CURLFORM_COPYNAME, "openid.mode",
1020 CURLFORM_COPYCONTENTS, "check_authentication",
1021 CURLFORM_END
1022 );
1023
1024 HashPos *HashPos = GetNewHashPos(keys, 0);
1025 while (GetNextHashPos(keys, HashPos, &len, &Key, &Value) != 0) {
1026 if (strcasecmp(Key, "mode")) {
1027 char k_o_keyname[1024];
1028 snprintf(k_o_keyname, sizeof k_o_keyname, "openid.%s", (const char *)Key);
1029 curl_formadd(&formpost, &lastptr,
1030 CURLFORM_COPYNAME, k_o_keyname,
1031 CURLFORM_COPYCONTENTS, (char *)Value,
1032 CURLFORM_END
1033 );
1034 }
1035 }
1036 DeleteHashPos(&HashPos);
1037
1038 curl = ctdl_openid_curl_easy_init(errmsg);
1039 curl_easy_setopt(curl, CURLOPT_URL, ChrPtr(oiddata->op_url));
1040 curl_easy_setopt(curl, CURLOPT_WRITEDATA, ReplyBuf);
1041 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, CurlFillStrBuf_callback);
1042 curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
1043
1044 res = curl_easy_perform(curl);
1045 if (res) {
1046 syslog(LOG_DEBUG, "openid: cmd_oidf() libcurl error %d: %s", res, errmsg);
1047 oiddata->verified = 0;
1048 }
1049 curl_easy_cleanup(curl);
1050 curl_formfree(formpost);
1051
1052 if (cbmstrcasestr(ChrPtr(ReplyBuf), "is_valid:true") == NULL) {
1053 oiddata->verified = 0;
1054 }
1055 FreeStrBuf(&ReplyBuf);
1056
1057 syslog(LOG_DEBUG, "openid: authentication %s", (oiddata->verified ? "succeeded" : "failed") );
1058
1059 /* Respond to the client */
1060
1061 if (oiddata->verified) {
1062
1063 /* If we were already logged in, attach the OpenID to the user's account */
1064 if (CC->logged_in) {
1065 if (attach_extauth(&CC->user, oiddata->claimed_id) == 0) {
1066 cprintf("attach\n");
1067 syslog(LOG_DEBUG, "openid: attach succeeded");
1068 }
1069 else {
1070 cprintf("fail\n");
1071 syslog(LOG_DEBUG, "openid: attach failed");
1072 }
1073 }
1074
1075 /* Otherwise, a user is attempting to log in using the verified OpenID */
1076 else {
1077 /*
1078 * Existing user who has claimed this OpenID?
1079 *
1080 * Note: if you think that sending the password back over the wire is insecure,
1081 * check your assumptions. If someone has successfully asserted an OpenID that
1082 * is associated with the account, they already have password equivalency and can
1083 * login, so they could just as easily change the password, etc.
1084 */
1085 if (login_via_extauth(oiddata->claimed_id) == 0) {
1086 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
1088 syslog(LOG_DEBUG, "openid: logged in using previously claimed OpenID");
1089 }
1090
1091 /*
1092 * If this system does not allow self-service new user registration, the
1093 * remaining modes do not apply, so fail here and now.
1094 */
1095 else if (CtdlGetConfigInt("c_disable_newu")) {
1096 cprintf("fail\n");
1097 syslog(LOG_DEBUG, "openid: creating user failed due to local policy");
1098 }
1099
1100 /*
1101 * New user whose OpenID is verified and Attribute Exchange gave us a name?
1102 */
1103 else if (openid_create_user_via_ax(oiddata->claimed_id, keys) == 0) {
1104 cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
1106 syslog(LOG_DEBUG, "openid: successfully auto-created new user");
1107 }
1108
1109 /*
1110 * OpenID is verified, but the desired username either was not specified or
1111 * conflicts with an existing user. Manual account creation is required.
1112 */
1113 else {
1114 char *desired_name = NULL;
1115 cprintf("verify_only\n");
1116 cprintf("%s\n", ChrPtr(oiddata->claimed_id));
1117 if (GetHash(keys, "sreg.nickname", 13, (void *) &desired_name)) {
1118 cprintf("%s\n", desired_name);
1119 }
1120 else {
1121 cprintf("\n");
1122 }
1123 syslog(LOG_DEBUG, "openid: the desired display name is already taken.");
1124 }
1125 }
1126 }
1127 else {
1128 cprintf("fail\n");
1129 }
1130 cprintf("000\n");
1131
1132 if (oiddata->sreg_keys != NULL) {
1133 DeleteHash(&oiddata->sreg_keys);
1134 oiddata->sreg_keys = NULL;
1135 }
1136 oiddata->sreg_keys = keys;
1137}
1138
1139
1140
1141/**************************************************************************/
1142/* */
1143/* Functions in this section handle module initialization and shutdown */
1144/* */
1145/**************************************************************************/
1146
1147
1148
1149
1151{
1152 if (!threading) {
1153
1154 /* Only enable the OpenID command set when native mode authentication is in use. */
1155 if (CtdlGetConfigInt("c_auth_mode") == AUTHMODE_NATIVE) {
1156 CtdlRegisterProtoHook(cmd_oids, "OIDS", "Setup OpenID authentication");
1157 CtdlRegisterProtoHook(cmd_oidf, "OIDF", "Finalize OpenID authentication");
1158 CtdlRegisterProtoHook(cmd_oidl, "OIDL", "List OpenIDs associated with an account");
1159 CtdlRegisterProtoHook(cmd_oidd, "OIDD", "Detach an OpenID from an account");
1160 CtdlRegisterProtoHook(cmd_oidc, "OIDC", "Create new user after validating OpenID");
1161 CtdlRegisterProtoHook(cmd_oida, "OIDA", "List all OpenIDs in the database");
1162 }
1165 openid_level_supported = 1; /* This module supports OpenID 1.0 only */
1166 }
1167
1168 /* return our module name for the log */
1169 return "openid_rp";
1170}
#define CITADEL
Definition: citadel.h:33
#define AUTHMODE_NATIVE
Definition: citadel.h:173
int openid_level_supported
Definition: citserver.c:29
char * CtdlGetConfigStr(char *key)
Definition: config.c:393
int CtdlGetConfigInt(char *key)
Definition: config.c:426
#define CC
Definition: context.h:140
int CtdlAccessCheck(int)
Definition: user_ops.c:389
int CtdlGetUserByNumber(struct ctdluser *usbuf, long number)
Definition: user_ops.c:462
#define PRIO_LOGOUT
Definition: ctdl_module.h:81
void CtdlRegisterSessionHook(void(*fcn_ptr)(void), int EventType, int Priority)
#define CtdlAideMessage(TEXT, SUBJECT)
Definition: ctdl_module.h:58
@ ac_aide
Definition: ctdl_module.h:246
@ ac_logged_in
Definition: ctdl_module.h:244
int CtdlGetUser(struct ctdluser *usbuf, char *name)
Definition: user_ops.c:77
void CtdlRegisterUserHook(void(*fcn_ptr)(struct ctdluser *), int EventType)
void CtdlRegisterProtoHook(void(*handler)(char *), char *cmd, char *desc)
#define CTDL_MODULE_INIT(module_name)
Definition: ctdl_module.h:50
void cdb_free(struct cdbdata *cdb)
Definition: database.c:609
struct cdbdata * cdb_next_item(int cdb)
Definition: database.c:655
int cdb_store(int cdb, const void *ckey, int ckeylen, void *cdata, int cdatalen)
Definition: database.c:397
struct cdbdata * cdb_fetch(int cdb, const void *key, int keylen)
Definition: database.c:546
int cdb_delete(int cdb, void *key, int keylen)
Definition: database.c:482
void cdb_rewind(int cdb)
Definition: database.c:631
#define CIT_OK
Definition: ipcdef.h:6
#define ILLEGAL_VALUE
Definition: ipcdef.h:16
#define INTERNAL_ERROR
Definition: ipcdef.h:14
#define LISTING_FOLLOWS
Definition: ipcdef.h:5
#define START_CHAT_MODE
Definition: ipcdef.h:12
#define CMD_NOT_SUPPORTED
Definition: ipcdef.h:18
#define ERROR
Definition: ipcdef.h:9
void * malloc(size_t)
void free(void *)
struct ctdluser usbuf
Definition: serv_migrate.c:496
void extauth_purge(struct ctdluser *usbuf)
void cmd_oids(char *argbuf)
int login_via_extauth(StrBuf *claimed_id)
int attach_extauth(struct ctdluser *who, StrBuf *claimed_id)
void extract_link(StrBuf *target_buf, const char *rel, long repllen, StrBuf *source_buf)
void cmd_oidc(char *argbuf)
void Free_ctdl_openid(ctdl_openid **FreeMe)
void openid_cleanup_function(void)
void cmd_oidd(char *argbuf)
void cmd_oidf(char *argbuf)
void xrds_xml_chardata(void *data, const XML_Char *s, int len)
int parse_xrds_document(StrBuf *ReplyBuf)
void xrds_xml_start(void *data, const char *supplied_el, const char **attr)
int openid_create_user_via_ax(StrBuf *claimed_id, HashList *sreg_keys)
size_t yadis_headerfunction(void *ptr, size_t size, size_t nmemb, void *userdata)
struct _ctdl_openid ctdl_openid
void xrds_xml_end(void *data, const char *supplied_el)
@ openid_disco_none
@ openid_disco_xrds
@ openid_disco_html
void cmd_oida(char *argbuf)
int perform_openid2_discovery(StrBuf *SuppliedURL)
void cmd_oidl(char *argbuf)
CURL * ctdl_openid_curl_easy_init(char *errmsg)
void cmd_newu(char *cmdbuf)
Definition: serv_user.c:93
#define EVT_LOGOUT
Definition: server.h:216
#define EVT_PURGEUSER
Definition: server.h:228
@ CDB_EXTAUTH
Definition: server.h:197
int snprintf(char *buf, size_t max, const char *fmt,...)
Definition: snprintf.c:69
void * openid_data
Definition: context.h:127
StrBuf * claimed_id
StrBuf * op_url
HashList * sreg_keys
size_t len
Definition: server.h:203
char * ptr
Definition: server.h:204
char fullname[64]
Definition: citadel.h:90
long usernum
Definition: citadel.h:87
StrBuf * selected_service_uri
int selected_service_priority
int in_xrd
int current_service_priority
int current_service_is_oid2auth
int nesting_level
StrBuf * current_service_uri
StrBuf * CharData
void cprintf(const char *format,...)
Definition: sysdep.c:381
int client_getln(char *buf, int bufsize)
Definition: sysdep.c:548
void CtdlSetPassword(char *new_pw)
Definition: user_ops.c:1126
void do_login(void)
Definition: user_ops.c:662
int create_user(char *username, int become_user, uid_t uid)
Definition: user_ops.c:1065
void logged_in_response(void)
Definition: user_ops.c:739
@ CREATE_USER_BECOME_USER
Definition: user_ops.h:34
#define NATIVE_AUTH_UID
Definition: user_ops.h:36