+++ /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