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* Copyright (c) 1995-1997 The Apache Group. All rights reserved.
*
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* for use in the Apache HTTP server project (http://www.apache.org/)."
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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-id 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(HAVE_CRYPT_H)
#include <crypt.h>
#endif
typedef struct auth_config_struct {
char *auth_pwfile;
char *auth_grpfile;
int auth_authoritative;
} auth_config_rec;
void *create_auth_dir_config (pool *p, char *d)
{
auth_config_rec *sec =
(auth_config_rec *) 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;
}
const char *set_auth_slot (cmd_parms *cmd, void *offset, char *f, char *t)
{
if (t && strcmp(t, "standard"))
return pstrcat(cmd->pool, "Invalid auth file type: ", t, NULL);
return set_string_slot(cmd, offset, f);
}
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", 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;
char *get_pw(request_rec *r, char *user, char *auth_pwfile)
{
FILE *f;
char l[MAX_STRING_LEN];
const char *rpw, *w;
if(!(f=pfopen(r->pool, auth_pwfile, "r"))) {
log_reason ("Could not open password file", auth_pwfile, r);
return NULL;
}
while(!(cfg_getline(l,MAX_STRING_LEN,f))) {
if((l[0] == '#') || (!l[0])) continue;
rpw = l;
w = getword(r->pool, &rpw, ':');
if(!strcmp(user,w)) {
pfclose(r->pool, f);
return getword(r->pool, &rpw, ':');
}
}
pfclose(r->pool, f);
return NULL;
}
table *groups_for_user (pool *p, char *user, char *grpfile) {
FILE *f;
table *grps = make_table (p, 15);
pool *sp;
char l[MAX_STRING_LEN];
const char *group_name, *ll, *w;
if(!(f=pfopen(p, grpfile, "r")))
return NULL;
sp = make_sub_pool (p);
while(!(cfg_getline(l,MAX_STRING_LEN,f))) {
if((l[0] == '#') || (!l[0])) continue;
ll = l;
clear_pool (sp);
group_name = getword(sp, &ll, ':');
while(ll[0]) {
w = getword_conf (sp, &ll);
if(!strcmp(w,user)) {
table_set (grps, group_name, "in");
break;
}
}
}
pfclose(p, f);
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...
*/
int authenticate_basic_user (request_rec *r)
{
auth_config_rec *sec =
(auth_config_rec *)get_module_config (r->per_dir_config, &auth_module);
conn_rec *c = r->connection;
char *sent_pw, *real_pw;
char errstr[MAX_STRING_LEN];
int res;
if ((res = get_basic_auth_pw (r, &sent_pw))) return res;
if(!sec->auth_pwfile)
return DECLINED;
if (!(real_pw = get_pw(r, c->user, sec->auth_pwfile))) {
if (!(sec->auth_authoritative))
return DECLINED;
ap_snprintf(errstr, sizeof(errstr), "user %s not found",c->user);
log_reason (errstr, r->uri, r);
note_basic_auth_failure (r);
return AUTH_REQUIRED;
}
/* anyone know where the prototype for crypt is? */
if(strcmp(real_pw,(char *)crypt(sent_pw,real_pw))) {
ap_snprintf(errstr, sizeof(errstr), "user %s: password mismatch",c->user);
log_reason (errstr, r->uri, r);
note_basic_auth_failure (r);
return AUTH_REQUIRED;
}
return OK;
}
/* Checking ID */
int check_user_access (request_rec *r) {
auth_config_rec *sec =
(auth_config_rec *)get_module_config (r->per_dir_config, &auth_module);
char *user = r->connection->user;
int m = r->method_number;
int method_restricted = 0;
register int x;
const char *t, *w;
table *grpstatus;
array_header *reqs_arr = 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 = getword(r->pool, &t, ' ');
if(!strcmp(w,"valid-user"))
return OK;
if(!strcmp(w,"user")) {
while(t[0]) {
w = 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 = getword_conf(r->pool, &t);
if(table_get (grpstatus, w))
return OK;
}
}
}
if (!method_restricted)
return OK;
if (!(sec -> auth_authoritative))
return DECLINED;
note_basic_auth_failure (r);
return AUTH_REQUIRED;
}
module MODULE_VAR_EXPORT auth_module = {
STANDARD_MODULE_STUFF,
NULL, /* initializer */
create_auth_dir_config, /* dir config creater */
NULL, /* dir merger --- default is to override */
NULL, /* server config */
NULL, /* merge server config */
auth_cmds, /* command table */
NULL, /* handlers */
NULL, /* filename translation */
authenticate_basic_user, /* check_user_id */
check_user_access, /* check auth */
NULL, /* check access */
NULL, /* type_checker */
NULL, /* fixups */
NULL, /* logger */
NULL, /* header parser */
NULL /* child_init */
};
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