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commit all files, will need cleanup later.

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Jean-Luc Cyr
2018-11-13 14:29:46 -05:00
parent dd1db50da1
commit ca90192f52
19 changed files with 2049 additions and 121 deletions
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mod_absec_c.c
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/*
** mod_absec.c -- Apache absec module
** [base Autogenerated via ``apxs -n absec -g'']
**
** To play with this sample module first compile it into a
** DSO file and install it into Apache's modules directory
** by running:
**
** $ apxs -lpam -lpam_misc -c -i mod_absec.c
**
** Then activate it in Apache's httpd.conf file for instance
** for the URL /absec in as follows:
**
** # httpd.conf
** LoadModule absec_module modules/mod_absec.so
** <Location /absec>
** SetHandler absec
** </Location>
**
** Then after restarting Apache via
**
** $ apachectl restart
**
*/
/*
TEST URL
http://10.211.55.15/absec/<fichier>
INFORMATION SOURCES
https://apr.apache.org/docs/apr/1.5/group__apr__strings.html
https://apr.apache.org/docs/apr-util/1.6/files.html
https://httpd.apache.org/docs/2.4/developer/modguide.html
http://www.ziviani.net/2011/how-to-create-an-apache-module
https://en.wikipedia.org/wiki/Basic_access_authentication
*/
#include "httpd.h"
#include "http_config.h"
#include "http_core.h"
#include "http_protocol.h"
#include "ap_config.h"
#include "apr_base64.h"
#include "apr_strings.h"
#include "apr_portable.h"
#include "apr_user.h"
#include <pwd.h>
#include <grp.h>
#include <sys/types.h>
#include <unistd.h>
#include "apr_want.h"
#include <shadow.h>
#include <sys/stat.h>
#include <security/pam_appl.h>
#include <security/pam_misc.h>
#include <mysql.h>
////////////////////////////////////////////////////////////////
/* Check user autentication against unix user/pass */
static int check_autentication(request_rec *r)
{
return 0;
}
////////////////////////////////////////////////////////////////
/* Check check file perms */
static int check_autorization(request_rec *r)
{
return 0;
}
// Global var for passing fake response to PAM callback
struct pam_response *reply;
////////////////////////////////////////////////////////////////
// PAM response callback function
int converse(int n, const struct pam_message **msg,
struct pam_response **resp, void *data)
{
// Return globally set response
*resp = reply;
return PAM_SUCCESS;
}
////////////////////////////////////////////////////////////////
// define PAM callback function
struct pam_conv conv = { converse, 0 };
////////////////////////////////////////////////////////////////
// define PAM callback function
int mysql_lookup(request_rec *r, struct stat *fperm)
{
MYSQL *conn;
MYSQL_RES *res;
MYSQL_ROW row;
char *server = "localhost";
char *user = "jlcyr";
char *password = "password"; /* set me first */
char *database = "absec";
conn = mysql_init(NULL);
/* Connect to database */
if (!mysql_real_connect(conn, server,
user, password, database, 0, NULL, 0)) {
ap_rprintf(r, "%s\n<br/>", mysql_error(conn));
return(0);
}
char query[256];
sprintf(query, "select * from urls where url='%s'", r->uri);
/* send SQL query */
//if (mysql_query(conn, "show tables")) {
if (mysql_query(conn, query)) {
ap_rprintf(r, "%s\n<br/>", mysql_error(conn));
return(-1);
}
res = mysql_use_result(conn);
/* output table name */
ap_rprintf(r, "MySQL data:\n<br/>");
int cnt = 0;
while ((row = mysql_fetch_row(res)) != NULL) {
ap_rprintf(r, "%s %d %d %o \n<br/>", row[0], atoi(row[1]), atoi(row[2]), atoi(row[3]));
fperm->st_uid = atoi(row[1]);
fperm->st_gid = atoi(row[2]);
fperm->st_mode = atoi(row[3]);
cnt = cnt + 1;
}
if (cnt==0) {
sprintf(query, "insert into urls (url, uid, gid, perms) values ('%s', 0, 0, 0)", r->uri);
if (mysql_query(conn, query)) {
ap_rprintf(r, "%s\n<br/>", mysql_error(conn));
return(0);
}
ap_rprintf(r, "Aucune donnee\n<br/>");
}
/* close connection */
mysql_free_result(res);
mysql_close(conn);
return(0);
}
////////////////////////////////////////////////////////////////
/* Main routine - called after request processing */
static int absec_handler_last(request_rec *r)
{
// Is this module really called?
if (strcmp(r->handler, "absec")) {
return DECLINED;
}
////////
/* http method validate the perm asked (r/w vs get/post,put) */
ap_rprintf(r, "After Method: %s<br/>\r\n", r->method);
int permmask = 0;
if (strcmp(r->method,"GET")!=0)
{
// Not a GET, it's too late to do anything
ap_rprintf(r, "Not a GET post treatement is too late!\n<br/>");
return (DECLINED);
}
r->content_type = "text/html";
//ap_rprintf(r, "The sample page from mod_absec.c %s \n<br/>", r->args);
ap_rprintf(r, "After GET Url: %s from %s \n<br/>", r->filename, r->uri);
return (DECLINED);
}
////////////////////////////////////////////////////////////////
/* Main routine - called before request processing */
static int absec_handler_first(request_rec *r)
{
ap_rprintf(r, "Before Method: %s<br/>\r\n", r->method);
// Is this module really called?
/*if (strcmp(r->handler, "absec")) {
ap_rprintf(r, "DECLINED<br/>\r\n");
return DECLINED;
}*/
////////
/* http method validate the perm asked (r/w vs get/post,put) */
ap_rprintf(r, "Before Method: %s<br/>\r\n", r->method);
int permmask = 0;
if (strcmp(r->method,"GET")==0) permmask=0444; // r
if (strcmp(r->method,"PUT")==0) permmask=0222; // w
if (strcmp(r->method,"POST")==0) permmask=0222; // w
if (strcmp(r->method,"DELETE")==0) permmask=0111; // x
////////
/* check file permission on filesystem */
/* should include <sys/stat.h> */
struct stat fperm;
int status;
//status = stat(r->filename, &fperm);
status = mysql_lookup(r, &fperm);
//ap_rprintf(r, "Result mysql: %d<br/>\r\n", );
if (status==-1) {
ap_rprintf(r, "stat erreur %d", errno);
return (OK);
}
//ap_rprintf(r, "File perms %o, owner %d, group %d (status %d)<br/>\r\n", fperm.st_mode, fperm.st_uid, fperm.st_gid, status);
/* check if any permission (ogw) match method (get r, put/post w, delete x) */
if ((fperm.st_mode & permmask)==0) {
/* no permission match, return don't even have to check user perms */
ap_rprintf(r, "Aucune permission pour la methode %s (%o, %o)", r->method, fperm.st_mode, permmask);
return (OK);
}
// If file is world accessible for asked method return content
if (fperm.st_mode & 0x7 & permmask) {
/* if so, return, no need to check user perms */
//ap_rprintf(r, "Fichier public<br/>\r\n");
return (DECLINED);
}
////////
/* Check if we have a basic auth user */
const char* auth64p;
// Check if we have an auth header
auth64p = apr_table_get(r->headers_in,"Authorization");
// If no basic auth, ask for one
if (auth64p==NULL) {
r->content_type = "text/html";
apr_table_setn(r->err_headers_out,
(PROXYREQ_PROXY == r->proxyreq) ? "Proxy-Authenticate"
: "WWW-Authenticate",
apr_pstrcat(r->pool, "Basic realm=\"PAS DE USER ", ap_auth_name(r),
"\"", NULL));
return HTTP_UNAUTHORIZED;
}
////////
/* Retrieve user/pass from http basic auth header */
// Get the basic auth base64 string and decode it
// Start at char 6 to skip 'Basic '
char *auth64;
auth64 = apr_pstrdup(r->pool, auth64p+6);
char *auth;
auth = apr_pcalloc(r->pool, 64);
apr_base64_decode(auth, auth64);
char *user;
char *pass;
user = apr_strtok(auth, ":", &pass);
r->content_type = "text/html";
ap_rprintf(r, "Url: %s from %s \n<br/>", r->filename, r->uri);
//ap_rprintf(r, "Headers Authorization: %s \n<br/>", auth64);
//ap_rprintf(r, "User/Pass: %s/%s \n<br/>", user, pass);
////////
// Connect to PAM to auth user
pam_handle_t * pamh = NULL;
int rret;
if((rret = pam_start("httpd", user/*pw->pw_name*/, &conv, &pamh)) != PAM_SUCCESS) {
return HTTP_INTERNAL_SERVER_ERROR;
printf("Pam start failed\n");
exit(0);
}
// Set the PAM callback function response (would call for password)
reply = (struct pam_response *)malloc(sizeof(struct pam_response));
reply[0].resp = strdup(pass); // password received in basic auth
reply[0].resp_retcode = 0;
if((rret = pam_authenticate(pamh, 0)) != PAM_SUCCESS) {
r->content_type = "text/html";
apr_table_setn(r->err_headers_out,
(PROXYREQ_PROXY == r->proxyreq) ? "Proxy-Authenticate"
: "WWW-Authenticate",
apr_pstrcat(r->pool, "Basic realm=\"USER/PASS INVALIDE ", ap_auth_name(r),
"\"", NULL));
return HTTP_UNAUTHORIZED;
printf("User auth failed\n");
exit(0);
}
if(pam_end(pamh, rret) != PAM_SUCCESS) {
//perror("pam_end");
pamh = NULL;
return HTTP_INTERNAL_SERVER_ERROR;
exit(1);
}
////////
// Continue checking permission
////////
/* Retrieve user details from /etc/passwd to get uid and primary group */
/* Should include <pwd.h> */
struct passwd *pw;
if((pw = getpwnam(user)) == NULL)
{
// Should never happend as already verified with PAM
ap_rprintf(r, "NULL \n<br/>");
apr_table_setn(r->err_headers_out,
(PROXYREQ_PROXY == r->proxyreq) ? "Proxy-Authenticate"
: "WWW-Authenticate",
apr_pstrcat(r->pool, "Basic realm=\"USER INCONNU ", ap_auth_name(r),
"\"", NULL));
// User cannot be found, unauthorized
return HTTP_UNAUTHORIZED;
}
// If file is user readable and user match return content
if ((fperm.st_uid==pw->pw_uid) && (fperm.st_mode & 0700 & permmask)) {
ap_rprintf(r, "Fichier propriétaire<br/>\r\n");
return (DECLINED);
}
// If file is group readable and primary group match return content
if ((fperm.st_gid==pw->pw_gid) && (fperm.st_mode & 0070 & permmask)) {
ap_rprintf(r, "Fichier groupe<br/>\r\n");
return (DECLINED);
}
////////
/* Check supplemental groups */
/* Should include <grp.h> */
//ap_rprintf(r, "Fichier propriétaire %d %d %o %o<br/>\r\n", fperm.st_uid, i, fperm.st_mode, 0400);
gid_t grouplist[16];
int grouplistsize = 16;
int groupreturn;
groupreturn = getgrouplist(user, pw->pw_gid, grouplist, &grouplistsize);
if (groupreturn >= 0) {
ap_rprintf(r, "OK liste des groupes (%d)<br/>\r\n", grouplistsize);
for (int i=0; i<grouplistsize; i++) {
ap_rprintf(r, "group: %d\r\n", grouplist[i]);
// If file is group readable and match a supplemental group return content
if ((fperm.st_gid==grouplist[i]) && (fperm.st_mode & 0070 & permmask)) {
ap_rprintf(r, "Fichier groupe supplementaire<br/>\r\n");
return (DECLINED);
}
}
}
// else decline request
ap_rprintf(r, "Aucuns droits de voir le fichier<br/>\r\n");
apr_table_setn(r->err_headers_out,
(PROXYREQ_PROXY == r->proxyreq) ? "Proxy-Authenticate"
: "WWW-Authenticate",
apr_pstrcat(r->pool, "Basic realm=\"NON AUTHORISE", ap_auth_name(r),
"\"", NULL));
return HTTP_UNAUTHORIZED;
}
////////////////////////////////////////////////////////////////
static void absec_register_hooks(apr_pool_t *p)
{
//ap_hook_handler(absec_handler, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_handler(absec_handler_last, NULL, NULL, APR_HOOK_LAST);
ap_hook_handler(absec_handler_first, NULL, NULL, APR_HOOK_FIRST);
// should use HOOK FIXUP
// should use FILTER
}
////////////////////////////////////////////////////////////////
/* Dispatch list for API hooks */
module AP_MODULE_DECLARE_DATA absec_module = {
STANDARD20_MODULE_STUFF,
NULL, /* create per-dir config structures */
NULL, /* merge per-dir config structures */
NULL, /* create per-server config structures */
NULL, /* merge per-server config structures */
NULL, /* table of config file commands */
absec_register_hooks /* register hooks */
};