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rlm_saml.c
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rlm_saml.c
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/*
* rlm_saml.c
*
* Version: $Id$
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*
* Copyright 2011 Hauke Mehrtens
*/
#include <freeradius/ident.h>
#include <freeradius/radiusd.h>
#include <freeradius/modules.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <openssl/sha.h>
#include <openssl/hmac.h>
#include <openssl/evp.h>
#include <openssl/bio.h>
#include <openssl/buffer.h>
#include <openssl/rand.h>
#include "samlc.h"
#include <ctype.h>
#include <mongoose.h>
// page show to forward the SAML Request.
#define PAGE_SAML_REQUEST "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.1//EN\" \"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd\">\n\
<html xmlns=\"http://www.w3.org/1999/xhtml\" xml:lang=\"de\">\n\
<head>\n\
<meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\" />\n\
<title>Weiterleitung zu Governikus Autent</title>\n\
</head>\n\
<body onload=\"document.forms[0].submit()\" style=\"background-color: #F0EEEE; font-size: 0.75em; font-family: Verdana, sans-serif, Arial\">\n\
<h1>Weiterleitung zu Governikus Autent</h1>\n\
<noscript>\n\
<p>\n\
Der SAML-Request soll nun per HTTP Post an den Server Governikus Autent übertragen werden. Da Ihr\n\
Browser kein Java Script ausführt, klicken Sie bitte auf den folgenden Button, um fortzufahren.\n\
</p>\n\
</noscript>\n\
<form action=\"%s\" method=\"post\">\n\
<div>\n\
<input type=\"hidden\" name=\"SAMLRequest\" value=\"%s\"/>\n\
<input type=\"hidden\" name=\"RelayState\" value=\"State#1314017600299\"/>\n\
<input type=\"submit\" value=\"Weiter\"/>\n\
</div>\n\
</form>\n\
</body>\n\
</html>\n"
#define ID_LEN 32
// based on max from http://gcc.gnu.org/onlinedocs/gcc/Typeof.html
#define min(a,b) \
({ typeof (a) _a = (a); \
typeof (b) _b = (b); \
_a < _b ? _a : _b; })
// congiguration for this module
typedef struct rlm_saml_config_t {
char *saml_receiver_url;
char *saml_client_url;
char *saml_entityID;
char *saml_request_sig_key;
char *saml_request_sig_cert;
char *saml_response_sig_cert;
char *saml_response_dec_key;
char *saml_response_dec_alias;
char *web_ssl_cert;
char *web_hostname;
int web_port;
int username_restictedID;
int username_name;
} rlm_saml_config_t;
typedef struct rlm_saml_web_t {
unsigned char id[ID_LEN + 2];
time_t expiry_date;
char *saml_request;
char *saml_response;
struct saml_response *response;
pthread_mutex_t response_available;
struct rlm_saml_web_t *next;
struct rlm_saml_web_t *priv;
struct rlm_saml_data_t *head;
} rlm_saml_web_t;
typedef struct rlm_saml_data_t {
rlm_saml_config_t config;
pthread_mutex_t web_lock;
rlm_saml_web_t *web;
struct mg_context *webserver;
} rlm_saml_data_t;
static const CONF_PARSER module_config[] = {
{ "web_port", PW_TYPE_INTEGER, offsetof(rlm_saml_config_t,web_port), NULL, NULL},
{ "web_ssl_cert", PW_TYPE_STRING_PTR, offsetof(rlm_saml_config_t,web_ssl_cert), NULL, NULL},
{ "web_hostname", PW_TYPE_STRING_PTR, offsetof(rlm_saml_config_t,web_hostname), NULL, NULL},
{ "saml_receiver_url", PW_TYPE_STRING_PTR, offsetof(rlm_saml_config_t,saml_receiver_url), NULL, NULL},
{ "saml_request_sig_key", PW_TYPE_STRING_PTR, offsetof(rlm_saml_config_t,saml_request_sig_key), NULL, NULL},
{ "saml_request_sig_cert", PW_TYPE_STRING_PTR, offsetof(rlm_saml_config_t,saml_request_sig_cert), NULL, NULL},
{ "saml_response_sig_cert", PW_TYPE_STRING_PTR, offsetof(rlm_saml_config_t,saml_response_sig_cert), NULL, NULL},
{ "saml_response_dec_key", PW_TYPE_STRING_PTR, offsetof(rlm_saml_config_t,saml_response_dec_key), NULL, NULL},
{ "saml_response_dec_alias", PW_TYPE_STRING_PTR, offsetof(rlm_saml_config_t,saml_response_dec_alias), NULL, NULL},
{ "saml_client_url", PW_TYPE_STRING_PTR, offsetof(rlm_saml_config_t,saml_client_url), NULL, NULL},
{ "saml_entityID", PW_TYPE_STRING_PTR, offsetof(rlm_saml_config_t,saml_entityID), NULL, NULL},
{ "username_restictedID", PW_TYPE_BOOLEAN, offsetof(rlm_saml_config_t,username_restictedID), NULL, NULL},
{ "username_name", PW_TYPE_BOOLEAN, offsetof(rlm_saml_config_t,username_name), NULL, NULL},
{ NULL, -1, 0, NULL, NULL } /* end the list */
};
// source: https://devenix.wordpress.com/2008/01/18/howto-base64-encode-and-decode-with-c-and-openssl-2/
static char *base64(const unsigned char *input, int length)
{
BIO *bmem, *b64;
BUF_MEM *bptr;
b64 = BIO_new(BIO_f_base64());
bmem = BIO_new(BIO_s_mem());
b64 = BIO_push(b64, bmem);
BIO_write(b64, input, length);
BIO_flush(b64);
BIO_get_mem_ptr(b64, &bptr);
char *buff = (char *)malloc(bptr->length);
memcpy(buff, bptr->data, bptr->length-1);
buff[bptr->length-1] = 0;
BIO_free_all(b64);
return buff;
}
// source: https://devenix.wordpress.com/2008/01/18/howto-base64-encode-and-decode-with-c-and-openssl-2/
static char *unbase64(unsigned char *input, int length)
{
BIO *b64, *bmem;
char *buffer = (char *)malloc(length);
memset(buffer, 0, length);
b64 = BIO_new(BIO_f_base64());
bmem = BIO_new_mem_buf(input, length);
bmem = BIO_push(b64, bmem);
BIO_read(bmem, buffer, length);
BIO_free_all(bmem);
return buffer;
}
static rlm_saml_web_t *saml_web_add_elem(rlm_saml_data_t *data, char *id, char *saml_request)
{
rlm_saml_web_t *elem;
elem = rad_malloc(sizeof(*elem));
if (!elem) {
return NULL;
}
memset(elem, 0, sizeof(*elem));
memcpy(elem->id, id, ID_LEN + 2);
elem->saml_request = saml_request;
elem->head = data;
elem->expiry_date = time(0) + 120;
pthread_mutex_init(&elem->response_available, NULL);
pthread_mutex_lock(&elem->response_available);
pthread_mutex_lock(&data->web_lock);
if (data->web != NULL) {
elem->next = data->web;
elem->priv = data->web->priv;
elem->next->priv = elem;
elem->priv->next = elem;
} else {
elem->next = elem;
elem->priv = elem;
}
data->web = elem;
pthread_mutex_unlock(&data->web_lock);
return elem;
}
static void saml_web_free_elem(rlm_saml_web_t *elem)
{
free(elem->saml_request);
free(elem->saml_response);
saml_free_response(elem->response);
pthread_mutex_destroy(&elem->response_available);
free(elem);
}
static void saml_web_remove_elem_no_lock(rlm_saml_web_t *elem)
{
rlm_saml_data_t *data = elem->head;
if (elem->next == elem) {
data->web = NULL;
saml_web_free_elem(elem);
return;
}
elem->next->priv = elem->priv;
elem->priv->next = elem->next;
saml_web_free_elem(elem);
}
static rlm_saml_web_t *saml_web_get_elem(rlm_saml_data_t *data, char *id)
{
rlm_saml_web_t *elem;
rlm_saml_web_t *current;
time_t now;
now = time(0);
pthread_mutex_lock(&data->web_lock);
if (data->web == NULL) {
pthread_mutex_unlock(&data->web_lock);
return NULL;
}
elem = data->web;
do {
if (!memcmp(id, elem->id, ID_LEN + 2)) {
pthread_mutex_unlock(&data->web_lock);
return elem;
}
current = elem;
elem = elem->next;
if (elem->expiry_date < now)
saml_web_remove_elem_no_lock(current);
} while (elem != data->web);
pthread_mutex_unlock(&data->web_lock);
return NULL;
}
static void saml_web_remove_elem(rlm_saml_web_t *elem)
{
rlm_saml_data_t *data = elem->head;
pthread_mutex_lock(&data->web_lock);
saml_web_remove_elem_no_lock(elem);
pthread_mutex_unlock(&data->web_lock);
}
static void saml_web_write_error_message(struct mg_connection *conn, char* message) {
printf("Write error message: %s\n", message);
mg_printf(conn, "HTTP/1.1 200 OK\r\n"
"Content-Length: %i\r\n"
"Content-Type: text/html\r\n\r\n"
"%s", strlen(message), message);
}
static void *saml_web_callback(enum mg_event event, struct mg_connection *conn,
const struct mg_request_info *request_info) {
rlm_saml_data_t *user_data = (rlm_saml_data_t *)request_info->user_data;
printf("SAML: WEB: got request for uri: %s query_string: %s\n", request_info->uri, request_info->query_string);
if (event == MG_NEW_REQUEST) {
char *result = NULL;
if (strlen(request_info->uri) == strlen("/samlRequest") &&
!strncmp("/samlRequest", request_info->uri, strlen("/samlRequest")) &&
strlen(request_info->query_string) > ID_LEN + 2 + 2 &&
!strncmp("id=", request_info->query_string, strlen("id="))) {
char *id;
rlm_saml_web_t *elem;
char *saml_request_base64;
char *html_page;
size_t size;
id = request_info->query_string + strlen("id=");
elem = saml_web_get_elem(user_data, id);
if (!elem) {
saml_web_write_error_message(conn, "id not found");
goto out;
}
saml_request_base64 = base64((const unsigned char *)elem->saml_request, strlen(elem->saml_request));
size = strlen(PAGE_SAML_REQUEST) + strlen(saml_request_base64) + strlen(user_data->config.saml_receiver_url) - 4 + 1;
html_page = rad_malloc(size);
if (!html_page) {
saml_web_write_error_message(conn, "malloc failed");
goto out;
}
if (snprintf(html_page, size, PAGE_SAML_REQUEST, user_data->config.saml_receiver_url, saml_request_base64) < 0) {
free(html_page);
saml_web_write_error_message(conn, "writing html_page failed");
goto out;
}
mg_printf(conn, "HTTP/1.1 200 OK\r\n"
"Content-Length: %i\r\n"
"Content-Type: text/html\r\n\r\n",
strlen(html_page));
mg_write(conn, html_page, strlen(html_page));
free(html_page);
result = "";
goto out;
} else if (strlen(request_info->uri) == strlen("/samlResponse") &&
!strncmp("/samlResponse", request_info->uri, min(strlen(request_info->uri), strlen("/samlResponse")))) {
struct saml_response *response_data;
rlm_saml_web_t *elem;
result = "";
// Read data from the remote end, return number of bytes read.
const char *size_str = mg_get_header(conn, "Content-Length");
if (!size_str) {
saml_web_write_error_message(conn, "No Content-Length");
goto out;
}
long int size = strtol(size_str, NULL, 10);
if (size <= 0 || size >= 30000) {
saml_web_write_error_message(conn, "Content-Length too big");
goto out;
}
char *post_message = rad_malloc(size);
if (!post_message) {
saml_web_write_error_message(conn, "malloc failed");
goto out;
}
mg_read(conn, post_message, size);
char *saml_response_base64 = rad_malloc(size);
if (!saml_response_base64) {
free(post_message);
saml_web_write_error_message(conn, "malloc failed");
goto out;
}
mg_get_var(post_message, size, "SAMLResponse", saml_response_base64, size);
free(post_message);
char *saml_response = unbase64((unsigned char *)saml_response_base64, strlen(saml_response_base64));
free(saml_response_base64);
if (!saml_response) {
saml_web_write_error_message(conn, "malloc failed");
goto out;
}
if (saml_parse(saml_response,
user_data->config.saml_response_dec_key,
user_data->config.saml_response_dec_alias,
user_data->config.saml_response_sig_cert,
&response_data)) {
free(saml_response);
saml_web_write_error_message(conn, "can not parse saml response");
goto out;
}
elem = saml_web_get_elem(user_data, response_data->in_response_to);
if (!elem) {
free(saml_response);
saml_free_response(response_data);
saml_web_write_error_message(conn, "id not found");
goto out;
}
elem->response = response_data;
elem->saml_response = saml_response;
pthread_mutex_unlock(&elem->response_available);
mg_printf(conn, "HTTP/1.1 200 OK\r\n"
"Content-Length: %i\r\n"
"Content-Type: text/text\r\n\r\n",
strlen(saml_response));
mg_write(conn, saml_response, strlen(saml_response));
result = "";
goto out;
} else {
// Echo requested URI back to the client
mg_printf(conn, "HTTP/1.1 200 OK\r\n"
"Content-Length: %i\r\n"
"Content-Type: text/html\r\n\r\n"
"%s", strlen(request_info->uri), request_info->uri);
result = "";
goto out;
}
out:
return result;
} else {
return NULL;
}
}
static int saml_web_start(rlm_saml_data_t *data)
{
char port[10];
snprintf(port, 10, "%is", data->config.web_port);
const char *options[] = {
"listening_ports", port,
"ssl_certificate", data->config.web_ssl_cert,
NULL};
data->webserver = mg_start(&saml_web_callback, data, options);
if (!data->webserver)
return -1;
return 0;
}
static int saml_instantiate(CONF_SECTION *conf, void **instance)
{
rlm_saml_data_t *data;
data = rad_malloc(sizeof(*data));
if (!data) {
goto err_return;
}
memset(data, 0, sizeof(*data));
if (cf_section_parse(conf, &data->config, module_config) < 0) {
goto err_malloc;
}
pthread_mutex_init(&data->web_lock, NULL);
if (saml_web_start(data)){
goto err_malloc;
}
saml_init();
*instance = data;
return 0;
err_malloc:
free(data);
err_return:
return -1;
}
static int saml_detach(void *instance)
{
rlm_saml_data_t *data = (rlm_saml_data_t *)instance;
mg_stop(data->webserver);
saml_term();
return 0;
}
// based on: http://codepad.org/lCypTglt
// and http://www.geekhideout.com/urlcode.shtml
static const char* hexDigest = "0123456789abcdef";
static char toHex(char from)
{
return hexDigest[from & 15];
}
static void toHexStr(unsigned char *from, size_t from_len, char *buf, size_t buf_len)
{
int write = 0;
int read = 0;
while (read < from_len && write < buf_len) {
buf[write] = toHex(from[read] >> 4);
write++;
buf[write] = toHex(from[read]);
write++;
read++;
}
}
void remove_spaces(char *source, char *dest)
{
while(*source) {
if (!ispunct(*source) && !isspace(*source)) {
*dest = *source;
dest++;
}
source++;
}
*dest = 0;
}
#define FRAGEMNT_MAX_LENGTH 240
static int add_fragmented(void *message, int len, VALUE_PAIR **vp, char *pairName)
{
int pos = 0;
VALUE_PAIR *pair;
for(; len > 0 ; len = len - FRAGEMNT_MAX_LENGTH){
char part[FRAGEMNT_MAX_LENGTH + 1];
memcpy(part, message + pos, min(FRAGEMNT_MAX_LENGTH, len));
part[min(FRAGEMNT_MAX_LENGTH, len)] = 0;
printf("message_part: %s\n", part);
pair = pairmake(pairName, part, T_OP_EQ);
if (!pair)
return -1;
pairadd(vp, pair);
pos = pos + FRAGEMNT_MAX_LENGTH;
}
return 0;
}
#define SAML_URL_STR "https://%s:%i/samlRequest?id=%s"
static int saml_authorize(void *instance, REQUEST *request)
{
VALUE_PAIR *pair;
char *url;
char *url_to_send;
size_t size;
unsigned char rand[ID_LEN / 2];
char randHex[ID_LEN + 3];
char *saml_request;
rlm_saml_data_t *data = (rlm_saml_data_t *)instance;
rlm_saml_web_t * elem;
printf("SAML: saml_authorize\n");
if (!RAND_bytes(rand, ID_LEN / 2))
return 0;
toHexStr(rand, sizeof(rand), randHex + 2, sizeof(randHex) - 3);
randHex[0] = '0';
randHex[1] = 'x';
randHex[ID_LEN + 2] = 0;
if (saml_create(data->config.saml_entityID, randHex,
data->config.saml_receiver_url, NULL, NULL, NULL,
data->config.saml_request_sig_key,
data->config.saml_request_sig_cert, &saml_request)) {
return 0;
}
printf("SAML: saml_authorize: saml_request: %s\n", saml_request);
elem = saml_web_add_elem(data, randHex, saml_request);
if (!elem)
return 0;
size = strlen(SAML_URL_STR) + 1 - 6 + strlen(data->config.web_hostname) + 5 + ID_LEN +2;
url = rad_malloc(size);
if (!url)
return 0;
if (snprintf(url, size, SAML_URL_STR, data->config.web_hostname, data->config.web_port, randHex) < 0) {
free(url);
return 0;
}
if (data->config.saml_client_url) {
char *url_encode;
size = strlen(url) * 2;
url_encode = rad_malloc(size);
if (!url_encode) {
free(url);
return 0;
}
mg_url_encode(url, url_encode, size);
free(url);
size = strlen(url_encode) + strlen(data->config.saml_client_url) + 1;
url_to_send = rad_malloc(size);
if (!url_to_send) {
free(url_encode);
return 0;
}
if (snprintf(url_to_send, size, data->config.saml_client_url, url_encode) < 0) {
free(url_encode);
free(url_to_send);
return 0;
}
free(url_encode);
} else {
url_to_send = url;
}
size = strlen(url_to_send) + 8 + 1;
url = rad_malloc(size);
if (!url) {
free(url_to_send);
return 0;
}
if (snprintf(url, size, "OPENURL=%s", url_to_send) < 0) {
free(url_to_send);
free(url);
return 0;
}
free(url_to_send);
pair = pairmake("Crypt-Password", url, T_OP_EQ);
if (!pair) {
free(url);
return 0;
}
pairadd(&request->config_items, pair);
free(url);
return RLM_MODULE_NOOP;
}
static int saml_authenticate(void *instance, REQUEST *request)
{
VALUE_PAIR *vp;
int ret;
rlm_saml_data_t *data = (rlm_saml_data_t *)instance;
rlm_saml_web_t *elem;
struct timespec timeout = {0,0};
char result[300];
char decoded[300];
char id[64];
char *name = NULL;
int size;
printf("SAML: saml_authenticate\n");
vp = pairfind(request->config_items, PW_AUTHTYPE);
if (vp != NULL) {
printf("SAML: PW_AUTHTYPE: %s\n", vp->vp_strvalue);
} else {
pairadd(&request->config_items,
pairmake("Auth-Type", "SAML", T_OP_EQ));
}
vp = pairfind(request->packet->vps, PW_CRYPT_PASSWORD);
if (!vp) {
return 0;
}
printf("SAML: url: %s\n", vp->vp_strvalue);
sscanf(vp->vp_strvalue + strlen("OPENURL="), data->config.saml_client_url, result);
char *end = strchr(result, '&');
if (end > 0)
*end = 0;
printf("SAML: id: %s\n", result);
mg_url_decode(result, strlen(result), decoded, 300, 1);
printf("SAML: mg_url_decode: %s\n", decoded);
sscanf(decoded, "https://bachelor.lan:9875/samlRequest?id=%s", id);
elem = saml_web_get_elem(data, id);
if (!elem) {
printf("can not find elem for id: %s\n", id);
return 0;
}
timeout.tv_sec = time(0) + 120;
ret = pthread_mutex_timedlock(&elem->response_available, &timeout);
if (ret) {
printf("No saml response in current time\n");
return 0;
}
if (data->config.username_restictedID) {
name = saml_get_char_xpath(elem->response->assertion, "//saml:Assertion/saml:AttributeStatement/saml:Attribute", "RestrictedId");
} else if (data->config.username_name) {
char *given_name;
char *family_name;
char *placeOfResidence;
char *name_with_spaces;
given_name = saml_get_char_xpath(elem->response->assertion, "//saml:Assertion/saml:AttributeStatement/saml:Attribute", "GivenNames");
if (!given_name)
return 0;
family_name = saml_get_char_xpath(elem->response->assertion, "//saml:Assertion/saml:AttributeStatement/saml:Attribute", "FamilyNames");
if (!family_name) {
free(given_name);
return 0;
}
placeOfResidence = saml_get_char_xpath(elem->response->assertion, "//saml:Assertion/saml:AttributeStatement/saml:Attribute", "PlaceOfResidence");
if (!placeOfResidence) {
free(given_name);
free(family_name);
return 0;
}
size = strlen(given_name) + strlen(family_name) + strlen(placeOfResidence) + 1;
name_with_spaces = rad_malloc(size);
if (!name_with_spaces) {
free(given_name);
free(family_name);
free(placeOfResidence);
return 0;
}
if (snprintf(name_with_spaces, size, "%s%s%s", given_name, family_name, placeOfResidence) < 0) {
free(name_with_spaces);
free(given_name);
free(family_name);
free(placeOfResidence);
return 0;
}
free(given_name);
free(family_name);
free(placeOfResidence);
name = rad_malloc(size);
if (!name) {
free(name_with_spaces);
return 0;
}
remove_spaces(name_with_spaces, name);
free(name_with_spaces);
}
if (name) {
vp = pairmake("User-Name", name, T_OP_EQ);
if (!vp) {
free(name);
return 0;
}
pairadd(&request->reply->vps, vp);
free(name);
}
add_fragmented(elem->response->assertion_char, strlen(elem->response->assertion_char), &request->reply->vps, "SAML-AAA-Assertion");
saml_web_remove_elem(elem);
vp_printlist(stdout, request->reply->vps);
return RLM_MODULE_OK;
}
/*
* The module name should be the only globally exported symbol.
* That is, everything else should be 'static'.
*
* If the module needs to temporarily modify it's instantiation
* data, the type should be changed to RLM_TYPE_THREAD_UNSAFE.
* The server will then take care of ensuring that the module
* is single-threaded.
*/
module_t rlm_saml = {
RLM_MODULE_INIT,
"SAML",
RLM_TYPE_THREAD_SAFE, /* type */
saml_instantiate, /* instantiation */
saml_detach, /* detach */
{
saml_authenticate, /* authentication */
saml_authorize, /* authorization */
NULL, /* preaccounting */
NULL, /* accounting */
NULL, /* checksimul */
NULL, /* pre-proxy */
NULL, /* post-proxy */
NULL /* post-auth */
},
};