--- /dev/null
+// This is an implementation of OpenID 2.0 relying party support in stateless mode.
+//
+// Copyright (c) 2007-2022 by the citadel.org team
+//
+// This program is open source software. Use, duplication, or disclosure
+// is subject to the terms of the GNU General Public License, version 3.
+
+#include "../../sysdep.h"
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <pwd.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <time.h>
+#include <sys/wait.h>
+#include <string.h>
+#include <limits.h>
+#include <curl/curl.h>
+#include <expat.h>
+#include "../../ctdl_module.h"
+#include "../../config.h"
+#include "../../citserver.h"
+#include "../../user_ops.h"
+
+typedef struct _ctdl_openid {
+ StrBuf *op_url; // OpenID Provider Endpoint URL
+ StrBuf *claimed_id; // Claimed Identifier
+ int verified;
+ HashList *sreg_keys;
+} ctdl_openid;
+
+enum {
+ openid_disco_none,
+ openid_disco_xrds,
+ openid_disco_html
+};
+
+
+void Free_ctdl_openid(ctdl_openid **FreeMe) {
+ if (*FreeMe == NULL) {
+ return;
+ }
+ FreeStrBuf(&(*FreeMe)->op_url);
+ FreeStrBuf(&(*FreeMe)->claimed_id);
+ DeleteHash(&(*FreeMe)->sreg_keys);
+ free(*FreeMe);
+ *FreeMe = NULL;
+}
+
+
+// This cleanup function blows away the temporary memory used by this module.
+void openid_cleanup_function(void) {
+
+ if (CC->openid_data != NULL) {
+ syslog(LOG_DEBUG, "openid: Clearing OpenID session state");
+ Free_ctdl_openid((ctdl_openid **) &CC->openid_data);
+ }
+}
+
+
+// Functions in this section handle Citadel internal OpenID mapping stuff
+
+
+// The structure of an openid record *key* is:
+//
+// |--------------claimed_id-------------|
+// (actual length of claimed id)
+//
+//
+// The structure of an openid record *value* is:
+//
+// |-----user_number----|------------claimed_id---------------|
+// (sizeof long) (actual length of claimed id)
+
+
+
+// Attach an external authenticator (such as an OpenID) to a Citadel account
+int attach_extauth(struct ctdluser *who, StrBuf *claimed_id) {
+ struct cdbdata *cdboi;
+ long fetched_usernum;
+ char *data;
+ int data_len;
+ char buf[2048];
+
+ if (!who) return(1);
+ if (StrLength(claimed_id)==0) return(1);
+
+ // Check to see if this authenticator is already in the database
+
+ cdboi = cdb_fetch(CDB_EXTAUTH, ChrPtr(claimed_id), StrLength(claimed_id));
+ if (cdboi != NULL) {
+ memcpy(&fetched_usernum, cdboi->ptr, sizeof(long));
+ cdb_free(cdboi);
+
+ if (fetched_usernum == who->usernum) {
+ syslog(LOG_INFO, "openid: %s already associated; no action is taken", ChrPtr(claimed_id));
+ return(0);
+ }
+ else {
+ syslog(LOG_INFO, "openid: %s already belongs to another user", ChrPtr(claimed_id));
+ return(3);
+ }
+ }
+
+ // Not already in the database, so attach it now
+
+ data_len = sizeof(long) + StrLength(claimed_id) + 1;
+ data = malloc(data_len);
+
+ memcpy(data, &who->usernum, sizeof(long));
+ memcpy(&data[sizeof(long)], ChrPtr(claimed_id), StrLength(claimed_id) + 1);
+
+ cdb_store(CDB_EXTAUTH, ChrPtr(claimed_id), StrLength(claimed_id), data, data_len);
+ free(data);
+
+ snprintf(buf, sizeof buf, "User <%s> (#%ld) is now associated with %s\n", who->fullname, who->usernum, ChrPtr(claimed_id));
+ CtdlAideMessage(buf, "External authenticator claim");
+ syslog(LOG_INFO, "openid: %s", buf);
+ return(0);
+}
+
+
+// When a user is being deleted, we have to delete any OpenID associations
+void extauth_purge(struct ctdluser *usbuf) {
+ struct cdbdata *cdboi;
+ HashList *keys = NULL;
+ HashPos *HashPos;
+ char *deleteme = NULL;
+ long len;
+ void *Value;
+ const char *Key;
+ long usernum = 0L;
+
+ keys = NewHash(1, NULL);
+ if (!keys) return;
+
+ cdb_rewind(CDB_EXTAUTH);
+ while (cdboi = cdb_next_item(CDB_EXTAUTH), cdboi != NULL) {
+ if (cdboi->len > sizeof(long)) {
+ memcpy(&usernum, cdboi->ptr, sizeof(long));
+ if (usernum == usbuf->usernum) {
+ deleteme = strdup(cdboi->ptr + sizeof(long)),
+ Put(keys, deleteme, strlen(deleteme), deleteme, NULL);
+ }
+ }
+ cdb_free(cdboi);
+ }
+
+ // Go through the hash list, deleting keys we stored in it
+
+ HashPos = GetNewHashPos(keys, 0);
+ while (GetNextHashPos(keys, HashPos, &len, &Key, &Value)!=0)
+ {
+ syslog(LOG_DEBUG, "openid: deleting associated external authenticator <%s>", (char*)Value);
+ cdb_delete(CDB_EXTAUTH, Value, strlen(Value));
+ // note: don't free(Value) -- deleting the hash list will handle this for us
+ }
+ DeleteHashPos(&HashPos);
+ DeleteHash(&keys);
+}
+
+
+// List the OpenIDs associated with the currently logged in account
+void cmd_oidl(char *argbuf) {
+ struct cdbdata *cdboi;
+ long usernum = 0L;
+
+ if (CtdlGetConfigInt("c_disable_newu")) {
+ cprintf("%d this system does not support openid.\n", ERROR + CMD_NOT_SUPPORTED);
+ return;
+ }
+ if (CtdlAccessCheck(ac_logged_in)) return;
+
+ cdb_rewind(CDB_EXTAUTH);
+ cprintf("%d Associated external authenticators:\n", LISTING_FOLLOWS);
+
+ while (cdboi = cdb_next_item(CDB_EXTAUTH), cdboi != NULL) {
+ if (cdboi->len > sizeof(long)) {
+ memcpy(&usernum, cdboi->ptr, sizeof(long));
+ if (usernum == CC->user.usernum) {
+ cprintf("%s\n", cdboi->ptr + sizeof(long));
+ }
+ }
+ cdb_free(cdboi);
+ }
+ cprintf("000\n");
+}
+
+
+// List ALL OpenIDs in the database
+void cmd_oida(char *argbuf) {
+ struct cdbdata *cdboi;
+ long usernum;
+ struct ctdluser usbuf;
+
+ if (CtdlGetConfigInt("c_disable_newu")) {
+ cprintf("%d this system does not support openid.\n",
+ ERROR + CMD_NOT_SUPPORTED);
+ return;
+ }
+ if (CtdlAccessCheck(ac_aide)) return;
+ cdb_rewind(CDB_EXTAUTH);
+ cprintf("%d List of all OpenIDs in the database:\n", LISTING_FOLLOWS);
+
+ while (cdboi = cdb_next_item(CDB_EXTAUTH), cdboi != NULL) {
+ if (cdboi->len > sizeof(long)) {
+ memcpy(&usernum, cdboi->ptr, sizeof(long));
+ if (CtdlGetUserByNumber(&usbuf, usernum) != 0) {
+ usbuf.fullname[0] = 0;
+ }
+ cprintf("%s|%ld|%s\n",
+ cdboi->ptr + sizeof(long),
+ usernum,
+ usbuf.fullname
+ );
+ }
+ cdb_free(cdboi);
+ }
+ cprintf("000\n");
+}
+
+
+// Create a new user account, manually specifying the name, after successfully
+// verifying an OpenID (which will of course be attached to the account)
+void cmd_oidc(char *argbuf) {
+ ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
+
+ if (CtdlGetConfigInt("c_disable_newu")) {
+ cprintf("%d this system does not support openid.\n",
+ ERROR + CMD_NOT_SUPPORTED);
+ return;
+ }
+ if ( (!oiddata) || (!oiddata->verified) ) {
+ cprintf("%d You have not verified an OpenID yet.\n", ERROR);
+ return;
+ }
+
+ // We can make the semantics of OIDC exactly the same as NEWU, simply
+ // by _calling_ cmd_newu() and letting it run. Very clever!
+ cmd_newu(argbuf);
+
+ // Now, if this logged us in, we have to attach the OpenID
+ if (CC->logged_in) {
+ attach_extauth(&CC->user, oiddata->claimed_id);
+ }
+
+}
+
+
+// Detach an OpenID from the currently logged in account
+void cmd_oidd(char *argbuf) {
+ struct cdbdata *cdboi;
+ char id_to_detach[1024];
+ int this_is_mine = 0;
+ long usernum = 0L;
+
+ if (CtdlGetConfigInt("c_disable_newu")) {
+ cprintf("%d this system does not support openid.\n",
+ ERROR + CMD_NOT_SUPPORTED);
+ return;
+ }
+ if (CtdlAccessCheck(ac_logged_in)) return;
+ extract_token(id_to_detach, argbuf, 0, '|', sizeof id_to_detach);
+ if (IsEmptyStr(id_to_detach)) {
+ cprintf("%d An empty OpenID URL is not allowed.\n", ERROR + ILLEGAL_VALUE);
+ }
+
+ cdb_rewind(CDB_EXTAUTH);
+ while (cdboi = cdb_next_item(CDB_EXTAUTH), cdboi != NULL) {
+ if (cdboi->len > sizeof(long)) {
+ memcpy(&usernum, cdboi->ptr, sizeof(long));
+ if (usernum == CC->user.usernum) {
+ this_is_mine = 1;
+ }
+ }
+ cdb_free(cdboi);
+ }
+
+ if (!this_is_mine) {
+ cprintf("%d That OpenID was not found or not associated with your account.\n",
+ ERROR + ILLEGAL_VALUE);
+ return;
+ }
+
+ cdb_delete(CDB_EXTAUTH, id_to_detach, strlen(id_to_detach));
+ cprintf("%d %s detached from your account.\n", CIT_OK, id_to_detach);
+}
+
+
+// Attempt to auto-create a new Citadel account using the nickname from Attribute Exchange
+int openid_create_user_via_ax(StrBuf *claimed_id, HashList *sreg_keys) {
+ char *nickname = NULL;
+ char *firstname = NULL;
+ char *lastname = NULL;
+ char new_password[32];
+ long len;
+ const char *Key;
+ void *Value;
+
+ if (CtdlGetConfigInt("c_auth_mode") != AUTHMODE_NATIVE) return(1);
+ if (CtdlGetConfigInt("c_disable_newu")) return(2);
+ if (CC->logged_in) return(3);
+
+ HashPos *HashPos = GetNewHashPos(sreg_keys, 0);
+ while (GetNextHashPos(sreg_keys, HashPos, &len, &Key, &Value) != 0) {
+ syslog(LOG_DEBUG, "openid: %s = %s", Key, (char *)Value);
+
+ if (cbmstrcasestr(Key, "value.nickname") != NULL) {
+ nickname = (char *)Value;
+ }
+ else if ( (nickname == NULL) && (cbmstrcasestr(Key, "value.nickname") != NULL)) {
+ nickname = (char *)Value;
+ }
+ else if (cbmstrcasestr(Key, "value.firstname") != NULL) {
+ firstname = (char *)Value;
+ }
+ else if (cbmstrcasestr(Key, "value.lastname") != NULL) {
+ lastname = (char *)Value;
+ }
+
+ }
+ DeleteHashPos(&HashPos);
+
+ if (nickname == NULL) {
+ if ((firstname != NULL) || (lastname != NULL)) {
+ char fullname[1024] = "";
+ if (firstname) strcpy(fullname, firstname);
+ if (firstname && lastname) strcat(fullname, " ");
+ if (lastname) strcat(fullname, lastname);
+ nickname = fullname;
+ }
+ }
+
+ if (nickname == NULL) {
+ return(4);
+ }
+ syslog(LOG_DEBUG, "openid: the desired account name is <%s>", nickname);
+
+ if (!CtdlGetUser(&CC->user, nickname)) {
+ syslog(LOG_DEBUG, "openid: <%s> is already taken by another user.", nickname);
+ memset(&CC->user, 0, sizeof(struct ctdluser));
+ return(5);
+ }
+
+ // The desired account name is available. Create the account and log it in!
+ if (create_user(nickname, CREATE_USER_BECOME_USER, NATIVE_AUTH_UID)) return(6);
+
+ // Generate a random password.
+ // The user doesn't care what the password is since he is using OpenID.
+ snprintf(new_password, sizeof new_password, "%08lx%08lx", random(), random());
+ CtdlSetPassword(new_password);
+
+ // Now attach the verified OpenID to this account.
+ attach_extauth(&CC->user, claimed_id);
+
+ return(0);
+}
+
+
+// If a user account exists which is associated with the Claimed ID, log it in and return zero.
+// Otherwise it returns nonzero.
+int login_via_extauth(StrBuf *claimed_id) {
+ struct cdbdata *cdboi;
+ long usernum = 0;
+
+ cdboi = cdb_fetch(CDB_EXTAUTH, ChrPtr(claimed_id), StrLength(claimed_id));
+ if (cdboi == NULL) {
+ return(-1);
+ }
+
+ memcpy(&usernum, cdboi->ptr, sizeof(long));
+ cdb_free(cdboi);
+
+ if (!CtdlGetUserByNumber(&CC->user, usernum)) {
+ // Now become the user we just created
+ safestrncpy(CC->curr_user, CC->user.fullname, sizeof CC->curr_user);
+ do_login();
+ return(0);
+ }
+ else {
+ memset(&CC->user, 0, sizeof(struct ctdluser));
+ return(-1);
+ }
+}
+
+
+// Functions in this section handle OpenID protocol
+
+
+// Locate a <link> tag and, given its 'rel=' parameter, return its 'href' parameter
+void extract_link(StrBuf *target_buf, const char *rel, long repllen, StrBuf *source_buf) {
+ int i;
+ const char *ptr;
+ const char *href_start = NULL;
+ const char *href_end = NULL;
+ const char *link_tag_start = NULL;
+ const char *link_tag_end = NULL;
+ const char *rel_start = NULL;
+ const char *rel_end = NULL;
+
+ if (!target_buf) return;
+ if (!rel) return;
+ if (!source_buf) return;
+
+ ptr = ChrPtr(source_buf);
+
+ FlushStrBuf(target_buf);
+ while (ptr = cbmstrcasestr(ptr, "<link"), ptr != NULL) {
+
+ link_tag_start = ptr;
+ link_tag_end = strchr(ptr, '>');
+ if (link_tag_end == NULL)
+ break;
+ for (i=0; i < 1; i++ ){
+ rel_start = cbmstrcasestr(link_tag_start, "rel=");
+ if ((rel_start == NULL) ||
+ (rel_start > link_tag_end))
+ continue;
+
+ rel_start = strchr(rel_start, '\"');
+ if ((rel_start == NULL) ||
+ (rel_start > link_tag_end))
+ continue;
+ ++rel_start;
+ rel_end = strchr(rel_start, '\"');
+ if ((rel_end == NULL) ||
+ (rel_end == rel_start) ||
+ (rel_end >= link_tag_end) )
+ continue;
+ if (strncasecmp(rel, rel_start, repllen)!= 0)
+ continue; // didn't match? never mind...
+
+ href_start = cbmstrcasestr(link_tag_start, "href=");
+ if ((href_start == NULL) ||
+ (href_start >= link_tag_end))
+ continue;
+ href_start = strchr(href_start, '\"');
+ if ((href_start == NULL) |
+ (href_start >= link_tag_end))
+ continue;
+ ++href_start;
+ href_end = strchr(href_start, '\"');
+ if ((href_end == NULL) ||
+ (href_end == href_start) ||
+ (href_start >= link_tag_end))
+ continue;
+ StrBufPlain(target_buf, href_start, href_end - href_start);
+ }
+ ptr = link_tag_end;
+ }
+}
+
+
+// Wrapper for curl_easy_init() that includes the options common to all calls used in this module.
+CURL *ctdl_openid_curl_easy_init(char *errmsg) {
+ CURL *curl;
+
+ curl = curl_easy_init();
+ if (!curl) {
+ return(curl);
+ }
+
+ curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
+ curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
+
+ if (errmsg) {
+ curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errmsg);
+ }
+ curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
+#ifdef CURLOPT_HTTP_CONTENT_DECODING
+ curl_easy_setopt(curl, CURLOPT_HTTP_CONTENT_DECODING, 1);
+ curl_easy_setopt(curl, CURLOPT_ENCODING, "");
+#endif
+ curl_easy_setopt(curl, CURLOPT_USERAGENT, CITADEL);
+ curl_easy_setopt(curl, CURLOPT_TIMEOUT, 30); // die after 30 seconds
+
+ if (
+ (!IsEmptyStr(CtdlGetConfigStr("c_ip_addr")))
+ && (strcmp(CtdlGetConfigStr("c_ip_addr"), "*"))
+ && (strcmp(CtdlGetConfigStr("c_ip_addr"), "::"))
+ && (strcmp(CtdlGetConfigStr("c_ip_addr"), "0.0.0.0"))
+ ) {
+ curl_easy_setopt(curl, CURLOPT_INTERFACE, CtdlGetConfigStr("c_ip_addr"));
+ }
+
+ return(curl);
+}
+
+
+struct xrds {
+ StrBuf *CharData;
+ int nesting_level;
+ int in_xrd;
+ int current_service_priority;
+ int selected_service_priority;
+ StrBuf *current_service_uri;
+ StrBuf *selected_service_uri;
+ int current_service_is_oid2auth;
+};
+
+
+void xrds_xml_start(void *data, const char *supplied_el, const char **attr) {
+ struct xrds *xrds = (struct xrds *) data;
+ int i;
+
+ ++xrds->nesting_level;
+
+ if (!strcasecmp(supplied_el, "XRD")) {
+ ++xrds->in_xrd;
+ }
+
+ else if (!strcasecmp(supplied_el, "service")) {
+ xrds->current_service_priority = 0;
+ xrds->current_service_is_oid2auth = 0;
+ for (i=0; attr[i] != NULL; i+=2) {
+ if (!strcasecmp(attr[i], "priority")) {
+ xrds->current_service_priority = atoi(attr[i+1]);
+ }
+ }
+ }
+
+ FlushStrBuf(xrds->CharData);
+}
+
+
+void xrds_xml_end(void *data, const char *supplied_el) {
+ struct xrds *xrds = (struct xrds *) data;
+
+ --xrds->nesting_level;
+
+ if (!strcasecmp(supplied_el, "XRD")) {
+ --xrds->in_xrd;
+ }
+
+ else if (!strcasecmp(supplied_el, "type")) {
+ if ( (xrds->in_xrd)
+ && (!strcasecmp(ChrPtr(xrds->CharData), "http://specs.openid.net/auth/2.0/server"))
+ ) {
+ xrds->current_service_is_oid2auth = 1;
+ }
+ if ( (xrds->in_xrd)
+ && (!strcasecmp(ChrPtr(xrds->CharData), "http://specs.openid.net/auth/2.0/signon"))
+ ) {
+ xrds->current_service_is_oid2auth = 1;
+ // FIXME in this case, the Claimed ID should be considered immutable
+ }
+ }
+
+ else if (!strcasecmp(supplied_el, "uri")) {
+ if (xrds->in_xrd) {
+ FlushStrBuf(xrds->current_service_uri);
+ StrBufAppendBuf(xrds->current_service_uri, xrds->CharData, 0);
+ }
+ }
+
+ else if (!strcasecmp(supplied_el, "service")) {
+ if ( (xrds->in_xrd)
+ && (xrds->current_service_priority < xrds->selected_service_priority)
+ && (xrds->current_service_is_oid2auth)
+ ) {
+ xrds->selected_service_priority = xrds->current_service_priority;
+ FlushStrBuf(xrds->selected_service_uri);
+ StrBufAppendBuf(xrds->selected_service_uri, xrds->current_service_uri, 0);
+ }
+
+ }
+
+ FlushStrBuf(xrds->CharData);
+}
+
+
+void xrds_xml_chardata(void *data, const XML_Char *s, int len) {
+ struct xrds *xrds = (struct xrds *) data;
+
+ StrBufAppendBufPlain (xrds->CharData, s, len, 0);
+}
+
+
+// Parse an XRDS document.
+// If an OpenID Provider URL is discovered, op_url to that value and return nonzero.
+// If nothing useful happened, return 0.
+int parse_xrds_document(StrBuf *ReplyBuf) {
+ ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
+ struct xrds xrds;
+ int return_value = 0;
+
+ memset(&xrds, 0, sizeof (struct xrds));
+ xrds.selected_service_priority = INT_MAX;
+ xrds.CharData = NewStrBuf();
+ xrds.current_service_uri = NewStrBuf();
+ xrds.selected_service_uri = NewStrBuf();
+ XML_Parser xp = XML_ParserCreate(NULL);
+ if (xp) {
+ XML_SetUserData(xp, &xrds);
+ XML_SetElementHandler(xp, xrds_xml_start, xrds_xml_end);
+ XML_SetCharacterDataHandler(xp, xrds_xml_chardata);
+ XML_Parse(xp, ChrPtr(ReplyBuf), StrLength(ReplyBuf), 0);
+ XML_Parse(xp, "", 0, 1);
+ XML_ParserFree(xp);
+ }
+ else {
+ syslog(LOG_ERR, "openid: cannot create XML parser");
+ }
+
+ if (xrds.selected_service_priority < INT_MAX) {
+ if (oiddata->op_url == NULL) {
+ oiddata->op_url = NewStrBuf();
+ }
+ FlushStrBuf(oiddata->op_url);
+ StrBufAppendBuf(oiddata->op_url, xrds.selected_service_uri, 0);
+ return_value = openid_disco_xrds;
+ }
+
+ FreeStrBuf(&xrds.CharData);
+ FreeStrBuf(&xrds.current_service_uri);
+ FreeStrBuf(&xrds.selected_service_uri);
+
+ return(return_value);
+}
+
+
+// Callback function for perform_openid2_discovery()
+// We're interested in the X-XRDS-Location: header.
+size_t yadis_headerfunction(void *ptr, size_t size, size_t nmemb, void *userdata) {
+ char hdr[1024];
+ StrBuf **x_xrds_location = (StrBuf **) userdata;
+
+ memcpy(hdr, ptr, (size*nmemb));
+ hdr[size*nmemb] = 0;
+
+ if (!strncasecmp(hdr, "X-XRDS-Location:", 16)) {
+ *x_xrds_location = NewStrBufPlain(&hdr[16], ((size*nmemb)-16));
+ StrBufTrim(*x_xrds_location);
+ }
+
+ return(size * nmemb);
+}
+
+
+// Attempt to perform Yadis discovery as specified in Yadis 1.0 section 6.2.5.
+//
+// If Yadis fails, we then attempt HTML discovery using the same document.
+//
+// If successful, returns nonzero and calls parse_xrds_document() to act upon the received data.
+// If fails, returns 0 and does nothing else.
+int perform_openid2_discovery(StrBuf *SuppliedURL) {
+ ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
+ int docbytes = (-1);
+ StrBuf *ReplyBuf = NULL;
+ int return_value = 0;
+ CURL *curl;
+ CURLcode result;
+ char errmsg[1024] = "";
+ struct curl_slist *my_headers = NULL;
+ StrBuf *x_xrds_location = NULL;
+
+ if (!SuppliedURL) return(0);
+ syslog(LOG_DEBUG, "openid: perform_openid2_discovery(%s)", ChrPtr(SuppliedURL));
+ if (StrLength(SuppliedURL) == 0) return(0);
+
+ ReplyBuf = NewStrBuf();
+ if (!ReplyBuf) return(0);
+
+ curl = ctdl_openid_curl_easy_init(errmsg);
+ if (!curl) return(0);
+
+ curl_easy_setopt(curl, CURLOPT_URL, ChrPtr(SuppliedURL));
+ curl_easy_setopt(curl, CURLOPT_WRITEDATA, ReplyBuf);
+ curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, CurlFillStrBuf_callback);
+
+ my_headers = curl_slist_append(my_headers, "Accept:"); // disable the default Accept: header
+ my_headers = curl_slist_append(my_headers, "Accept: application/xrds+xml");
+ curl_easy_setopt(curl, CURLOPT_HTTPHEADER, my_headers);
+
+ curl_easy_setopt(curl, CURLOPT_WRITEHEADER, &x_xrds_location);
+ curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, yadis_headerfunction);
+
+ result = curl_easy_perform(curl);
+ if (result) {
+ syslog(LOG_DEBUG, "openid: libcurl error %d: %s", result, errmsg);
+ }
+ curl_slist_free_all(my_headers);
+ curl_easy_cleanup(curl);
+ docbytes = StrLength(ReplyBuf);
+
+ // The response from the server will be one of:
+ //
+ // Option 1: An HTML document with a <head> element that includes a <meta> element with http-equiv
+ // attribute, X-XRDS-Location,
+ //
+ // Does any provider actually do this? If so then we will implement it in the future.
+ //
+ // Option 2: HTTP response-headers that include an X-XRDS-Location response-header,
+ // together with a document.
+ // Option 3: HTTP response-headers only, which MAY include an X-XRDS-Location response-header,
+ // a contenttype response-header specifying MIME media type,
+ // application/xrds+xml, or both.
+ //
+ // If the X-XRDS-Location header was delivered, we know about it at this point...
+ if ( (x_xrds_location)
+ && (strcmp(ChrPtr(x_xrds_location), ChrPtr(SuppliedURL)))
+ ) {
+ syslog(LOG_DEBUG, "openid: X-XRDS-Location: %s ... recursing!", ChrPtr(x_xrds_location));
+ return_value = perform_openid2_discovery(x_xrds_location);
+ FreeStrBuf(&x_xrds_location);
+ }
+
+ // Option 4: the returned web page may *be* an XRDS document. Try to parse it.
+ if ( (return_value == 0) && (docbytes >= 0)) {
+ return_value = parse_xrds_document(ReplyBuf);
+ }
+
+ // Option 5: if all else fails, attempt HTML based discovery.
+ if ( (return_value == 0) && (docbytes >= 0)) {
+ if (oiddata->op_url == NULL) {
+ oiddata->op_url = NewStrBuf();
+ }
+ extract_link(oiddata->op_url, HKEY("openid2.provider"), ReplyBuf);
+ if (StrLength(oiddata->op_url) > 0) {
+ return_value = openid_disco_html;
+ }
+ }
+
+ if (ReplyBuf != NULL) {
+ FreeStrBuf(&ReplyBuf);
+ }
+ return(return_value);
+}
+
+
+// Setup an OpenID authentication
+void cmd_oids(char *argbuf) {
+ const char *Pos = NULL;
+ StrBuf *ArgBuf = NULL;
+ StrBuf *ReplyBuf = NULL;
+ StrBuf *return_to = NULL;
+ StrBuf *RedirectUrl = NULL;
+ ctdl_openid *oiddata;
+ int discovery_succeeded = 0;
+
+ if (CtdlGetConfigInt("c_disable_newu")) {
+ cprintf("%d this system does not support openid.\n", ERROR + CMD_NOT_SUPPORTED);
+ return;
+ }
+ Free_ctdl_openid ((ctdl_openid**)&CC->openid_data);
+
+ CC->openid_data = oiddata = malloc(sizeof(ctdl_openid));
+ if (oiddata == NULL) {
+ syslog(LOG_ERR, "openid: malloc() failed: %m");
+ cprintf("%d malloc failed\n", ERROR + INTERNAL_ERROR);
+ return;
+ }
+ memset(oiddata, 0, sizeof(ctdl_openid));
+
+ ArgBuf = NewStrBufPlain(argbuf, -1);
+
+ oiddata->verified = 0;
+ oiddata->claimed_id = NewStrBufPlain(NULL, StrLength(ArgBuf));
+ return_to = NewStrBufPlain(NULL, StrLength(ArgBuf));
+
+ StrBufExtract_NextToken(oiddata->claimed_id, ArgBuf, &Pos, '|');
+ StrBufExtract_NextToken(return_to, ArgBuf, &Pos, '|');
+
+ syslog(LOG_DEBUG, "openid: user-Supplied Identifier is: %s", ChrPtr(oiddata->claimed_id));
+
+ // ********* OpenID 2.0 section 7.3 - Discovery *********
+
+ // Section 7.3.1 says we have to attempt XRI based discovery.
+ // No one is using this, no one is asking for it, no one wants it.
+ // So we're not even going to bother attempting this mode.
+
+ // Attempt section 7.3.2 (Yadis discovery) and section 7.3.3 (HTML discovery);
+ discovery_succeeded = perform_openid2_discovery(oiddata->claimed_id);
+
+ if (discovery_succeeded == 0) {
+ cprintf("%d There is no OpenID identity provider at this location.\n", ERROR);
+ }
+
+ else {
+ // If we get to this point we are in possession of a valid OpenID Provider URL.
+ syslog(LOG_DEBUG, "openid: OP URI '%s' discovered using method %d",
+ ChrPtr(oiddata->op_url),
+ discovery_succeeded
+ );
+
+ // We have to "normalize" our Claimed ID otherwise it will cause some OP's to barf
+ if (cbmstrcasestr(ChrPtr(oiddata->claimed_id), "://") == NULL) {
+ StrBuf *cid = oiddata->claimed_id;
+ oiddata->claimed_id = NewStrBufPlain(HKEY("http://"));
+ StrBufAppendBuf(oiddata->claimed_id, cid, 0);
+ FreeStrBuf(&cid);
+ }
+
+ // OpenID 2.0 section 9: request authentication
+ // Assemble a URL to which the user-agent will be redirected.
+
+ RedirectUrl = NewStrBufDup(oiddata->op_url);
+
+ StrBufAppendBufPlain(RedirectUrl, HKEY("?openid.ns="), 0);
+ StrBufUrlescAppend(RedirectUrl, NULL, "http://specs.openid.net/auth/2.0");
+
+ StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.mode=checkid_setup"), 0);
+
+ StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.claimed_id="), 0);
+ StrBufUrlescAppend(RedirectUrl, oiddata->claimed_id, NULL);
+
+ StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.identity="), 0);
+ StrBufUrlescAppend(RedirectUrl, oiddata->claimed_id, NULL);
+
+ // return_to tells the provider how to complete the round trip back to our site
+ StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.return_to="), 0);
+ StrBufUrlescAppend(RedirectUrl, return_to, NULL);
+
+ // Attribute Exchange
+ // See:
+ // http://openid.net/specs/openid-attribute-exchange-1_0.html
+ // http://code.google.com/apis/accounts/docs/OpenID.html#endpoint
+ // http://test-id.net/OP/AXFetch.aspx
+
+ StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.ns.ax="), 0);
+ StrBufUrlescAppend(RedirectUrl, NULL, "http://openid.net/srv/ax/1.0");
+
+ StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.ax.mode=fetch_request"), 0);
+
+ StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.ax.required=firstname,lastname,friendly,nickname"), 0);
+
+ StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.ax.type.firstname="), 0);
+ StrBufUrlescAppend(RedirectUrl, NULL, "http://axschema.org/namePerson/first");
+
+ StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.ax.type.lastname="), 0);
+ StrBufUrlescAppend(RedirectUrl, NULL, "http://axschema.org/namePerson/last");
+
+ StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.ax.type.friendly="), 0);
+ StrBufUrlescAppend(RedirectUrl, NULL, "http://axschema.org/namePerson/friendly");
+
+ StrBufAppendBufPlain(RedirectUrl, HKEY("&openid.ax.type.nickname="), 0);
+ StrBufUrlescAppend(RedirectUrl, NULL, "http://axschema.org/namePerson/nickname");
+
+ syslog(LOG_DEBUG, "openid: redirecting client to %s", ChrPtr(RedirectUrl));
+ cprintf("%d %s\n", CIT_OK, ChrPtr(RedirectUrl));
+ }
+
+ FreeStrBuf(&ArgBuf);
+ FreeStrBuf(&ReplyBuf);
+ FreeStrBuf(&return_to);
+ FreeStrBuf(&RedirectUrl);
+}
+
+
+// Finalize an OpenID authentication
+void cmd_oidf(char *argbuf) {
+ long len;
+ char buf[2048];
+ char thiskey[1024];
+ char thisdata[1024];
+ HashList *keys = NULL;
+ const char *Key;
+ void *Value;
+ ctdl_openid *oiddata = (ctdl_openid *) CC->openid_data;
+
+ if (CtdlGetConfigInt("c_disable_newu")) {
+ cprintf("%d this system does not support openid.\n",
+ ERROR + CMD_NOT_SUPPORTED);
+ return;
+ }
+ if (oiddata == NULL) {
+ cprintf("%d run OIDS first.\n", ERROR + INTERNAL_ERROR);
+ return;
+ }
+ if (StrLength(oiddata->op_url) == 0){
+ cprintf("%d No OpenID Endpoint URL has been obtained.\n", ERROR + ILLEGAL_VALUE);
+ return;
+ }
+ keys = NewHash(1, NULL);
+ if (!keys) {
+ cprintf("%d NewHash() failed\n", ERROR + INTERNAL_ERROR);
+ return;
+ }
+ cprintf("%d Transmit OpenID data now\n", START_CHAT_MODE);
+
+ while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
+ len = extract_token(thiskey, buf, 0, '|', sizeof thiskey);
+ if (len < 0) {
+ len = sizeof(thiskey) - 1;
+ }
+ extract_token(thisdata, buf, 1, '|', sizeof thisdata);
+ Put(keys, thiskey, len, strdup(thisdata), NULL);
+ }
+
+ // Check to see if this is a correct response.
+ // Start with verified=1 but then set it to 0 if anything looks wrong.
+ oiddata->verified = 1;
+
+ char *openid_ns = NULL;
+ if ( (!GetHash(keys, "ns", 2, (void *) &openid_ns))
+ || (strcasecmp(openid_ns, "http://specs.openid.net/auth/2.0"))
+ ) {
+ syslog(LOG_DEBUG, "openid: this is not an an OpenID assertion");
+ oiddata->verified = 0;
+ }
+
+ char *openid_mode = NULL;
+ if ( (!GetHash(keys, "mode", 4, (void *) &openid_mode))
+ || (strcasecmp(openid_mode, "id_res"))
+ ) {
+ oiddata->verified = 0;
+ }
+
+ char *openid_claimed_id = NULL;
+ if (GetHash(keys, "claimed_id", 10, (void *) &openid_claimed_id)) {
+ FreeStrBuf(&oiddata->claimed_id);
+ oiddata->claimed_id = NewStrBufPlain(openid_claimed_id, -1);
+ syslog(LOG_DEBUG, "openid: provider is asserting the Claimed ID '%s'", ChrPtr(oiddata->claimed_id));
+ }
+
+ // Validate the assertion against the server
+ syslog(LOG_DEBUG, "openid: validating...");
+
+ CURL *curl;
+ CURLcode res;
+ struct curl_httppost *formpost = NULL;
+ struct curl_httppost *lastptr = NULL;
+ char errmsg[1024] = "";
+ StrBuf *ReplyBuf = NewStrBuf();
+
+ curl_formadd(&formpost, &lastptr,
+ CURLFORM_COPYNAME, "openid.mode",
+ CURLFORM_COPYCONTENTS, "check_authentication",
+ CURLFORM_END
+ );
+
+ HashPos *HashPos = GetNewHashPos(keys, 0);
+ while (GetNextHashPos(keys, HashPos, &len, &Key, &Value) != 0) {
+ if (strcasecmp(Key, "mode")) {
+ char k_o_keyname[1024];
+ snprintf(k_o_keyname, sizeof k_o_keyname, "openid.%s", (const char *)Key);
+ curl_formadd(&formpost, &lastptr,
+ CURLFORM_COPYNAME, k_o_keyname,
+ CURLFORM_COPYCONTENTS, (char *)Value,
+ CURLFORM_END
+ );
+ }
+ }
+ DeleteHashPos(&HashPos);
+
+ curl = ctdl_openid_curl_easy_init(errmsg);
+ curl_easy_setopt(curl, CURLOPT_URL, ChrPtr(oiddata->op_url));
+ curl_easy_setopt(curl, CURLOPT_WRITEDATA, ReplyBuf);
+ curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, CurlFillStrBuf_callback);
+ curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
+
+ res = curl_easy_perform(curl);
+ if (res) {
+ syslog(LOG_DEBUG, "openid: cmd_oidf() libcurl error %d: %s", res, errmsg);
+ oiddata->verified = 0;
+ }
+ curl_easy_cleanup(curl);
+ curl_formfree(formpost);
+
+ if (cbmstrcasestr(ChrPtr(ReplyBuf), "is_valid:true") == NULL) {
+ oiddata->verified = 0;
+ }
+ FreeStrBuf(&ReplyBuf);
+
+ syslog(LOG_DEBUG, "openid: authentication %s", (oiddata->verified ? "succeeded" : "failed") );
+
+ // Respond to the client
+
+ if (oiddata->verified) {
+
+ // If we were already logged in, attach the OpenID to the user's account
+ if (CC->logged_in) {
+ if (attach_extauth(&CC->user, oiddata->claimed_id) == 0) {
+ cprintf("attach\n");
+ syslog(LOG_DEBUG, "openid: attach succeeded");
+ }
+ else {
+ cprintf("fail\n");
+ syslog(LOG_DEBUG, "openid: attach failed");
+ }
+ }
+
+ // Otherwise, a user is attempting to log in using the verified OpenID
+ else {
+ // Existing user who has claimed this OpenID?
+ //
+ // Note: if you think that sending the password back over the wire is insecure,
+ // check your assumptions. If someone has successfully asserted an OpenID that
+ // is associated with the account, they already have password equivalency and can
+ // login, so they could just as easily change the password, etc.
+ if (login_via_extauth(oiddata->claimed_id) == 0) {
+ cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
+ logged_in_response();
+ syslog(LOG_DEBUG, "openid: logged in using previously claimed OpenID");
+ }
+
+ // If this system does not allow self-service new user registration, the
+ // remaining modes do not apply, so fail here and now.
+ else if (CtdlGetConfigInt("c_disable_newu")) {
+ cprintf("fail\n");
+ syslog(LOG_DEBUG, "openid: creating user failed due to local policy");
+ }
+
+ // New user whose OpenID is verified and Attribute Exchange gave us a name?
+ else if (openid_create_user_via_ax(oiddata->claimed_id, keys) == 0) {
+ cprintf("authenticate\n%s\n%s\n", CC->user.fullname, CC->user.password);
+ logged_in_response();
+ syslog(LOG_DEBUG, "openid: successfully auto-created new user");
+ }
+
+ // OpenID is verified, but the desired username either was not specified or
+ // conflicts with an existing user. Manual account creation is required.
+ else {
+ char *desired_name = NULL;
+ cprintf("verify_only\n");
+ cprintf("%s\n", ChrPtr(oiddata->claimed_id));
+ if (GetHash(keys, "sreg.nickname", 13, (void *) &desired_name)) {
+ cprintf("%s\n", desired_name);
+ }
+ else {
+ cprintf("\n");
+ }
+ syslog(LOG_DEBUG, "openid: the desired display name is already taken.");
+ }
+ }
+ }
+ else {
+ cprintf("fail\n");
+ }
+ cprintf("000\n");
+
+ if (oiddata->sreg_keys != NULL) {
+ DeleteHash(&oiddata->sreg_keys);
+ oiddata->sreg_keys = NULL;
+ }
+ oiddata->sreg_keys = keys;
+}
+
+
+// Initialization function, called from modules_init.c
+char *ctdl_module_init_openid_rp(void) {
+ if (!threading) {
+ // Only enable the OpenID command set when native mode authentication is in use.
+ if (CtdlGetConfigInt("c_auth_mode") == AUTHMODE_NATIVE) {
+ CtdlRegisterProtoHook(cmd_oids, "OIDS", "Setup OpenID authentication");
+ CtdlRegisterProtoHook(cmd_oidf, "OIDF", "Finalize OpenID authentication");
+ CtdlRegisterProtoHook(cmd_oidl, "OIDL", "List OpenIDs associated with an account");
+ CtdlRegisterProtoHook(cmd_oidd, "OIDD", "Detach an OpenID from an account");
+ CtdlRegisterProtoHook(cmd_oidc, "OIDC", "Create new user after validating OpenID");
+ CtdlRegisterProtoHook(cmd_oida, "OIDA", "List all OpenIDs in the database");
+ }
+ CtdlRegisterSessionHook(openid_cleanup_function, EVT_LOGOUT, PRIO_LOGOUT + 10);
+ CtdlRegisterUserHook(extauth_purge, EVT_PURGEUSER);
+ openid_level_supported = 2; // This module supports OpenID 2.0 only
+ }
+
+ // return our module name for the log
+ return "openid_rp";
+}
projects / citadel.git / commitdiff