mod_auth.c revision b4c8a80f7dbfc9b56dbe03bdc28f0b5eb5f23697
/* ====================================================================
* Copyright (c) 1995-1999 The Apache Group. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
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*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
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* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the Apache Group
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
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* endorse or promote products derived from this software without
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* apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
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* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the Apache Group
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``AS IS'' AND ANY
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* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Group and was originally based
* on public domain software written at the National Center for
* Supercomputing Applications, University of Illinois, Urbana-Champaign.
* For more information on the Apache Group and the Apache HTTP server
* project, please see <http://www.apache.org/>.
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*/
/*
* http_auth: authentication
*
* Rob McCool
*
* Adapted to Apache by rst.
*
* dirkx - Added Authoritative control to allow passing on to lower
* modules if and only if the user ap_context_t d 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"
#include "http_request.h"
typedef struct auth_config_struct {
char *auth_pwfile;
char *auth_grpfile;
int auth_authoritative;
} auth_config_rec;
static void *create_auth_dir_config(ap_context_t *p, char *d)
{
auth_config_rec *sec =
(auth_config_rec *) ap_pcalloc(p, sizeof(auth_config_rec));
sec->auth_pwfile = NULL; /* just to illustrate the default really */
sec->auth_grpfile = NULL; /* unless you have a broken HP cc */
sec->auth_authoritative = 1; /* keep the fortress secure by default */
return sec;
}
static const char *set_auth_slot(cmd_parms *cmd, void *offset, char *f, char *t)
{
if (t && strcmp(t, "standard"))
return ap_pstrcat(cmd->pool, "Invalid auth file type: ", t, NULL);
return ap_set_file_slot(cmd, offset, f);
}
static const command_rec auth_cmds[] =
{
{"AuthUserFile", set_auth_slot,
(void *) XtOffsetOf(auth_config_rec, auth_pwfile), OR_AUTHCFG, TAKE12,
"text file containing user IDs and passwords"},
{"AuthGroupFile", set_auth_slot,
(void *) XtOffsetOf(auth_config_rec, auth_grpfile), OR_AUTHCFG, TAKE12,
"text file containing group names and member user IDs"},
{"AuthAuthoritative", ap_set_flag_slot,
(void *) XtOffsetOf(auth_config_rec, auth_authoritative),
OR_AUTHCFG, FLAG,
"Set to 'no' to allow access control to be passed along to lower modules if the UserID is not known to this module"},
{NULL}
};
module MODULE_VAR_EXPORT auth_module;
static char *get_pw(request_rec *r, char *user, char *auth_pwfile)
{
configfile_t *f;
char l[MAX_STRING_LEN];
const char *rpw, *w;
if (!(f = ap_pcfg_openfile(r->pool, auth_pwfile))) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, r,
"Could not open password file: %s", auth_pwfile);
return NULL;
}
while (!(ap_cfg_getline(l, MAX_STRING_LEN, f))) {
if ((l[0] == '#') || (!l[0]))
continue;
rpw = l;
w = ap_getword(r->pool, &rpw, ':');
if (!strcmp(user, w)) {
ap_cfg_closefile(f);
return ap_getword(r->pool, &rpw, ':');
}
}
ap_cfg_closefile(f);
return NULL;
}
static ap_table_t *groups_for_user(ap_context_t *p, char *user, char *grpfile)
{
configfile_t *f;
ap_table_t *grps = ap_make_table(p, 15);
ap_context_t *sp;
char l[MAX_STRING_LEN];
const char *group_name, *ll, *w;
if (!(f = ap_pcfg_openfile(p, grpfile))) {
/*add? aplog_error(APLOG_MARK, APLOG_ERR, NULL,
"Could not open group file: %s", grpfile);*/
return NULL;
}
ap_create_context(p, NULL, &sp);
while (!(ap_cfg_getline(l, MAX_STRING_LEN, f))) {
if ((l[0] == '#') || (!l[0]))
continue;
ll = l;
ap_clear_pool(sp);
group_name = ap_getword(sp, &ll, ':');
while (ll[0]) {
w = ap_getword_conf(sp, &ll);
if (!strcmp(w, user)) {
ap_table_setn(grps, ap_pstrdup(p, group_name), "in");
break;
}
}
}
ap_cfg_closefile(f);
ap_destroy_pool(sp);
return grps;
}
/* These functions return 0 if client is OK, and proper error status
* if not... either AUTH_REQUIRED, if we made a check, and it failed, or
* SERVER_ERROR, if things are so totally confused that we couldn't
* figure out how to tell if the client is authorized or not.
*
* If they return DECLINED, and all other modules also decline, that's
* treated by the server core as a configuration error, logged and
* reported as such.
*/
/* Determine user ID, and check if it really is that user, for HTTP
* basic authentication...
*/
static int authenticate_basic_user(request_rec *r)
{
auth_config_rec *sec =
(auth_config_rec *) ap_get_module_config(r->per_dir_config, &auth_module);
const char *sent_pw;
char *real_pw;
char *invalid_pw;
int res;
if ((res = ap_get_basic_auth_pw(r, &sent_pw)))
return res;
if (!sec->auth_pwfile)
return DECLINED;
if (!(real_pw = get_pw(r, r->user, sec->auth_pwfile))) {
if (!(sec->auth_authoritative))
return DECLINED;
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
"user %s not found: %s", r->user, r->uri);
ap_note_basic_auth_failure(r);
return AUTH_REQUIRED;
}
invalid_pw = ap_validate_password(sent_pw, real_pw);
if (invalid_pw != NULL) {
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
"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 check_user_access(request_rec *r)
{
auth_config_rec *sec =
(auth_config_rec *) ap_get_module_config(r->per_dir_config, &auth_module);
char *user = r->user;
int m = r->method_number;
int method_restricted = 0;
register int x;
const char *t, *w;
ap_table_t *grpstatus;
const ap_array_header_t *reqs_arr = ap_requires(r);
require_line *reqs;
/* BUG FIX: tadc, 11-Nov-1995. If there is no "requires" directive,
* then any user will do.
*/
if (!reqs_arr)
return (OK);
reqs = (require_line *) reqs_arr->elts;
if (sec->auth_grpfile)
grpstatus = groups_for_user(r->pool, user, sec->auth_grpfile);
else
grpstatus = NULL;
for (x = 0; x < reqs_arr->nelts; x++) {
if (!(reqs[x].method_mask & (1 << m)))
continue;
method_restricted = 1;
t = reqs[x].requirement;
w = ap_getword_white(r->pool, &t);
if (!strcmp(w, "valid-user"))
return OK;
if (!strcmp(w, "user")) {
while (t[0]) {
w = ap_getword_conf(r->pool, &t);
if (!strcmp(user, w))
return OK;
}
}
else if (!strcmp(w, "group")) {
if (!grpstatus)
return DECLINED; /* DBM group? Something else? */
while (t[0]) {
w = ap_getword_conf(r->pool, &t);
if (ap_table_get(grpstatus, w))
return OK;
}
} else if (sec->auth_authoritative) {
/* if we aren't authoritative, any require directive could be
* valid even if we don't grok it. However, if we are
* authoritative, we can warn the user they did something wrong.
* That something could be a missing "AuthAuthoritative off", but
* more likely is a typo in the require directive.
*/
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
"access to %s failed, reason: unknown require directive:"
"\"%s\"", r->uri, reqs[x].requirement);
}
}
if (!method_restricted)
return OK;
if (!(sec->auth_authoritative))
return DECLINED;
ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r,
"access to %s failed, reason: user %s not allowed access",
r->uri, user);
ap_note_basic_auth_failure(r);
return AUTH_REQUIRED;
}
static void register_hooks(void)
{
ap_hook_check_user_id(authenticate_basic_user,NULL,NULL,HOOK_MIDDLE);
ap_hook_auth_checker(check_user_access,NULL,NULL,HOOK_MIDDLE);
}
module MODULE_VAR_EXPORT auth_module =
{
STANDARD20_MODULE_STUFF,
create_auth_dir_config, /* dir config creater */
NULL, /* dir merger --- default is to override */
NULL, /* server config */
NULL, /* merge server config */
auth_cmds, /* command ap_table_t */
NULL, /* handlers */
register_hooks /* register hooks */
};