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* on public domain software written at the National Center for
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/*
* mod_auth_db: authentication
*
* Original work by Rob McCool & Brian Behlendorf.
*
* Adapted to Apache by rst (mod_auth_dbm)
*
* Adapted for Berkeley DB by Andrew Cohen
*
* mod_auth_db was based on mod_auth_dbm.
*
* Warning, this is not a drop in replacement for mod_auth_dbm,
* for people wanting to switch from dbm to Berkeley DB.
* It requires the use of AuthDBUserFile and AuthDBGroupFile
* instead of AuthDBMUserFile AuthDBMGroupFile
*
* Also, in the configuration file you need to specify
* db_auth_module rather than dbm_auth_module
*
* On some BSD systems (e.g. FreeBSD and NetBSD) dbm is automatically
* mapped to Berkeley DB. You can use either mod_auth_dbm or
* mod_auth_db. The latter makes it more obvious that it's Berkeley.
*
* 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"
#include <db.h>
typedef struct {
char *auth_dbpwfile;
char *auth_dbgrpfile;
int auth_dbauthoritative;
} db_auth_config_rec;
void *create_db_auth_dir_config (pool *p, char *d)
{
db_auth_config_rec *sec
= (db_auth_config_rec *)pcalloc (p, sizeof(db_auth_config_rec));
sec->auth_dbpwfile = NULL;
sec->auth_dbgrpfile = NULL;
sec->auth_dbauthoritative=1; /* fortress is secure by default */
return sec;
}
const char *set_db_slot (cmd_parms *cmd, void *offset, char *f, char *t)
{
if (!t || strcmp(t, "db"))
return DECLINE_CMD;
return set_string_slot(cmd, offset, f);
}
command_rec db_auth_cmds[] = {
{ "AuthDBUserFile", set_string_slot,
(void*)XtOffsetOf(db_auth_config_rec, auth_dbpwfile),
OR_AUTHCFG, TAKE1, NULL },
{ "AuthDBGroupFile", set_string_slot,
(void*)XtOffsetOf(db_auth_config_rec, auth_dbgrpfile),
OR_AUTHCFG, TAKE1, NULL },
{ "AuthUserFile", set_db_slot,
(void*)XtOffsetOf(db_auth_config_rec, auth_dbpwfile),
OR_AUTHCFG, TAKE12, NULL },
{ "AuthGroupFile", set_db_slot,
(void*)XtOffsetOf(db_auth_config_rec, auth_dbgrpfile),
OR_AUTHCFG, TAKE12, NULL },
{ "AuthDBAuthoritative", set_flag_slot,
(void*)XtOffsetOf(db_auth_config_rec, auth_dbauthoritative),
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 db_auth_module;
char *get_db_pw(request_rec *r, char *user, const char *auth_dbpwfile) {
DB *f;
DBT d, q;
char *pw = NULL;
q.data = user;
q.size = strlen(q.data);
if(!(f=dbopen(auth_dbpwfile,O_RDONLY,0664,DB_HASH,NULL))) {
log_reason ("could not open db auth file", auth_dbpwfile, r);
return NULL;
}
if (!((f->get)(f,&q,&d,0))) {
pw = palloc (r->pool, d.size + 1);
strncpy(pw,d.data,d.size);
pw[d.size] = '\0'; /* Terminate the string */
}
(f->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 DB file; key=username value=password":"groupname[":"anything]
*
* mark@telescope.org, 22Sep95
*/
char *get_db_grp(request_rec *r, char *user, const char *auth_dbgrpfile) {
char *grp_data = get_db_pw (r, user, auth_dbgrpfile);
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;
}
int db_authenticate_basic_user (request_rec *r)
{
db_auth_config_rec *sec =
(db_auth_config_rec *)get_module_config (r->per_dir_config,
&db_auth_module);
conn_rec *c = r->connection;
char *sent_pw, *real_pw, *colon_pw;
char errstr[MAX_STRING_LEN];
int res;
if ((res = get_basic_auth_pw (r, &sent_pw)))
return res;
if(!sec->auth_dbpwfile)
return DECLINED;
if(!(real_pw = get_db_pw(r, c->user, sec->auth_dbpwfile))) {
if (!(sec -> auth_dbauthoritative))
return DECLINED;
ap_snprintf(errstr, sizeof(errstr), "DB user %s not found", c->user);
log_reason (errstr, r->filename, r);
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';
/* 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 db_check_auth(request_rec *r) {
db_auth_config_rec *sec =
(db_auth_config_rec *)get_module_config (r->per_dir_config,
&db_auth_module);
char *user = r->connection->user;
int m = r->method_number;
char errstr[MAX_STRING_LEN];
array_header *reqs_arr = requires (r);
require_line *reqs = reqs_arr ? (require_line *)reqs_arr->elts : NULL;
register int x;
const char *t;
char *w;
if (!sec->auth_dbgrpfile) 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 = getword(r->pool, &t, ' ');
if(!strcmp(w,"group") && sec->auth_dbgrpfile) {
const char *orig_groups,*groups;
char *v;
if (!(groups = get_db_grp(r, user, sec->auth_dbgrpfile))) {
if (!(sec->auth_dbauthoritative))
return DECLINED;
ap_snprintf(errstr, sizeof(errstr),
"user %s not in DB group file %s",
user, sec->auth_dbgrpfile);
log_reason (errstr, r->filename, r);
note_basic_auth_failure (r);
return AUTH_REQUIRED;
}
orig_groups = groups;
while(t[0]) {
w = getword(r->pool, &t, ' ');
groups = orig_groups;
while(groups[0]) {
v = getword(r->pool, &groups,',');
if(!strcmp(v,w))
return OK;
}
}
ap_snprintf(errstr, sizeof(errstr),
"user %s not in right group",user);
log_reason (errstr, r->filename, r);
note_basic_auth_failure(r);
return AUTH_REQUIRED;
}
}
return DECLINED;
}
module db_auth_module = {
STANDARD_MODULE_STUFF,
NULL, /* initializer */
create_db_auth_dir_config, /* dir config creater */
NULL, /* dir merger --- default is to override */
NULL, /* server config */
NULL, /* merge server config */
db_auth_cmds, /* command table */
NULL, /* handlers */
NULL, /* filename translation */
db_authenticate_basic_user, /* check_user_id */
db_check_auth, /* check auth */
NULL, /* check access */
NULL, /* type_checker */
NULL, /* fixups */
NULL, /* logger */
NULL, /* header parser */
NULL /* child_init */
};
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