mod_auth_dbm.c revision ab2c1c1c83ec91415565da5a71fbc15d9685caa6
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
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*
* 1. Redistributions of source code must retain the above copyright
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* distribution.
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* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
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* not be used to endorse or promote products derived from this
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* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* Portions of this software are based upon public domain software
* originally written at the National Center for Supercomputing Applications,
* University of Illinois, Urbana-Champaign.
*/
/*
* http_auth: authentication
*
* Rob McCool & Brian Behlendorf.
*
* Adapted to Apache by rst.
*
* dirkx - Added Authoritative control to allow passing on to lower
* modules if and only if the userid is not known to this
* module. A known user with a faulty or absent password still
* causes an AuthRequired. The default is 'Authoritative', i.e.
* no control is passed along.
*/
#include "httpd.h"
#include "http_config.h"
#include "http_core.h"
#include "http_log.h"
#include "http_protocol.h"
#if defined(__GLIBC__) && defined(__GLIBC_MINOR__) \
&& __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1
#include <db1/ndbm.h>
#else
#include <ndbm.h>
#endif
/*
* Module definition information - the part between the -START and -END
* lines below is used by Configure. This could be stored in a separate
* instead.
*
* XXX: this needs updating for apache-2.0 configuration method
* MODULE-DEFINITION-START
* Name: auth_dbm_module
* ConfigStart
. ./helpers/find-dbm-lib
* ConfigEnd
* MODULE-DEFINITION-END
*/
typedef struct {
char *auth_dbmpwfile;
char *auth_dbmgrpfile;
int auth_dbmauthoritative;
} dbm_auth_config_rec;
static void *create_dbm_auth_dir_config(ap_context_t *p, char *d)
{
dbm_auth_config_rec *sec
= (dbm_auth_config_rec *) ap_pcalloc(p, sizeof(dbm_auth_config_rec));
sec->auth_dbmpwfile = NULL;
sec->auth_dbmgrpfile = NULL;
sec->auth_dbmauthoritative = 1; /* fortress is secure by default */
return sec;
}
static const char *set_dbm_slot(cmd_parms *cmd, void *offset, char *f, char *t)
{
if (!t || strcmp(t, "dbm"))
return DECLINE_CMD;
return ap_set_file_slot(cmd, offset, f);
}
static const command_rec dbm_auth_cmds[] =
{
{"AuthDBMUserFile", ap_set_file_slot,
(void *) XtOffsetOf(dbm_auth_config_rec, auth_dbmpwfile),
OR_AUTHCFG, TAKE1, NULL},
{"AuthDBMGroupFile", ap_set_file_slot,
(void *) XtOffsetOf(dbm_auth_config_rec, auth_dbmgrpfile),
OR_AUTHCFG, TAKE1, NULL},
{"AuthUserFile", set_dbm_slot,
(void *) XtOffsetOf(dbm_auth_config_rec, auth_dbmpwfile),
OR_AUTHCFG, TAKE12, NULL},
{"AuthGroupFile", set_dbm_slot,
(void *) XtOffsetOf(dbm_auth_config_rec, auth_dbmgrpfile),
OR_AUTHCFG, TAKE12, NULL},
{"AuthDBMAuthoritative", ap_set_flag_slot,
(void *) XtOffsetOf(dbm_auth_config_rec, auth_dbmauthoritative),
OR_AUTHCFG, FLAG, "Set to 'no' to allow access control to be passed along to lower modules, if the UserID is not known in this module"},
{NULL}
};
module auth_dbm_module;
static char *get_dbm_pw(request_rec *r, char *user, char *auth_dbmpwfile)
{
DBM *f;
datum d, q;
char *pw = NULL;
q.dptr = user;
#ifndef NETSCAPE_DBM_COMPAT
q.dsize = strlen(q.dptr);
#else
q.dsize = strlen(q.dptr) + 1;
#endif
if (!(f = dbm_open(auth_dbmpwfile, O_RDONLY, 0664))) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, errno, r,
"could not open dbm auth file: %s", auth_dbmpwfile);
return NULL;
}
d = dbm_fetch(f, q);
if (d.dptr) {
pw = ap_palloc(r->pool, d.dsize + 1);
strncpy(pw, d.dptr, d.dsize);
pw[d.dsize] = '\0'; /* Terminate the string */
}
dbm_close(f);
return pw;
}
/* We do something strange with the group file. If the group file
* contains any : we assume the format is
* key=username value=":"groupname [":"anything here is ignored]
* otherwise we now (0.8.14+) assume that the format is
* key=username value=groupname
* The first allows the password and group files to be the same
* physical DBM file; key=username value=password":"groupname[":"anything]
*
* mark@telescope.org, 22Sep95
*/
static char *get_dbm_grp(request_rec *r, char *user, char *auth_dbmgrpfile)
{
char *grp_data = get_dbm_pw(r, user, auth_dbmgrpfile);
char *grp_colon;
char *grp_colon2;
if (grp_data == NULL)
return NULL;
if ((grp_colon = strchr(grp_data, ':')) != NULL) {
grp_colon2 = strchr(++grp_colon, ':');
if (grp_colon2)
*grp_colon2 = '\0';
return grp_colon;
}
return grp_data;
}
static int dbm_authenticate_basic_user(request_rec *r)
{
dbm_auth_config_rec *sec =
(dbm_auth_config_rec *) ap_get_module_config(r->per_dir_config,
&auth_dbm_module);
const char *sent_pw;
char *real_pw, *colon_pw;
ap_status_t invalid_pw;
int res;
if ((res = ap_get_basic_auth_pw(r, &sent_pw)))
return res;
if (!sec->auth_dbmpwfile)
return DECLINED;
if (!(real_pw = get_dbm_pw(r, r->user, sec->auth_dbmpwfile))) {
if (!(sec->auth_dbmauthoritative))
return DECLINED;
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,
"DBM user %s not found: %s", r->user, r->filename);
ap_note_basic_auth_failure(r);
return AUTH_REQUIRED;
}
/* Password is up to first : if exists */
colon_pw = strchr(real_pw, ':');
if (colon_pw) {
*colon_pw = '\0';
}
invalid_pw = ap_validate_password(sent_pw, real_pw);
if (invalid_pw != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,
"DBM user %s: authentication failure for \"%s\": %s",
r->user, r->uri, invalid_pw);
ap_note_basic_auth_failure(r);
return AUTH_REQUIRED;
}
return OK;
}
/* Checking ID */
static int dbm_check_auth(request_rec *r)
{
dbm_auth_config_rec *sec =
(dbm_auth_config_rec *) ap_get_module_config(r->per_dir_config,
&auth_dbm_module);
char *user = r->user;
int m = r->method_number;
const ap_array_header_t *reqs_arr = ap_requires(r);
require_line *reqs = reqs_arr ? (require_line *) reqs_arr->elts : NULL;
register int x;
const char *t;
char *w;
if (!sec->auth_dbmgrpfile)
return DECLINED;
if (!reqs_arr)
return DECLINED;
for (x = 0; x < reqs_arr->nelts; x++) {
if (!(reqs[x].method_mask & (1 << m)))
continue;
t = reqs[x].requirement;
w = ap_getword_white(r->pool, &t);
if (!strcmp(w, "group") && sec->auth_dbmgrpfile) {
const char *orig_groups, *groups;
char *v;
if (!(groups = get_dbm_grp(r, user, sec->auth_dbmgrpfile))) {
if (!(sec->auth_dbmauthoritative))
return DECLINED;
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,
"user %s not in DBM group file %s: %s",
user, sec->auth_dbmgrpfile, r->filename);
ap_note_basic_auth_failure(r);
return AUTH_REQUIRED;
}
orig_groups = groups;
while (t[0]) {
w = ap_getword_white(r->pool, &t);
groups = orig_groups;
while (groups[0]) {
v = ap_getword(r->pool, &groups, ',');
if (!strcmp(v, w))
return OK;
}
}
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,
"user %s not in right group: %s",
user, r->filename);
ap_note_basic_auth_failure(r);
return AUTH_REQUIRED;
}
}
return DECLINED;
}
static void register_hooks(void)
{
ap_hook_check_user_id(dbm_authenticate_basic_user, NULL, NULL, HOOK_MIDDLE);
ap_hook_auth_checker(dbm_check_auth, NULL, NULL, HOOK_MIDDLE);
}
module auth_dbm_module =
{
STANDARD20_MODULE_STUFF,
create_dbm_auth_dir_config, /* dir config creater */
NULL, /* dir merger --- default is to override */
NULL, /* server config */
NULL, /* merge server config */
dbm_auth_cmds, /* command ap_table_t */
NULL, /* handlers */
register_hooks /* register hooks */
};