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openldap/contrib/tweb/checkclient.c
Kurt Spanier 884d6832d5 Initial revision
1999-09-10 17:33:39 +00:00

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7.3 KiB
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/*_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
* *
* checkclient.c *
* *
* Function:..Client-Check-Funktions *
* *
* *
* *
* Authors:...Dr. Kurt Spanier & Bernhard Winkler, *
* Zentrum fuer Datenverarbeitung, Bereich Entwicklung *
* neuer Dienste, Universitaet Tuebingen, GERMANY *
* *
* ZZZZZ DDD V V *
* Creation date: Z D D V V *
* March 7 1996 Z D D V V *
* Last modification: Z D D V V *
* March 19 1999 ZZZZ DDD V *
* *
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_*/
/*
* $Id: checkclient.c,v 1.6 1999/09/10 15:01:16 zrnsk01 Exp $
*
*/
#include "tgeneral.h"
#include "tglobal.h"
#include "init_exp.h"
#include "charray_exp.h"
#include "checkclient.h"
#include "regular_exp.h"
PRIVATE int check4access (host, glob)
char *host;
GLOB_STRUCT *glob;
/*
* check if host ends in a valid domain.
* return OK if so, NOTOK otherwise
*/
{
return(
(glob->allow_string ? checkad(host, glob->comp_allow, glob) : OK) &&
(glob->deny_string ? !checkad(host, glob->comp_deny, glob) : OK));
}
/* end of function: check4access */
PRIVATE int checkad (host, string, glob)
char *host;
regexp *string;
GLOB_STRUCT *glob;
{
char nhost[BUFSIZ];
strcpy(nhost, host ? host : "unknown.xxx");
return( tweb_regexec( string, nhost ));
}
/* end of function: checkad */
/* Analyse Web-Client-Type / proxy + Log-Message */
PUBLIC void checkwwwclient (fp, ip_addr, ip_port, hp, glob)
FILE *fp;
char *ip_addr;
unsigned int ip_port;
struct hostent *hp;
GLOB_STRUCT *glob;
{
char in[BUFSIZ];
char agent[BUFSIZ], via[BUFSIZ];
char *host = hp ? hp->h_name : "unknown";
*via = *agent = '\0';
if(!((glob->grant ? checkad(host, glob->comp_grant, glob) : OK) &&
(glob->refuse ? !checkad(host, glob->comp_refuse, glob) : OK))){
if (dosyslog)
syslog (LOG_INFO, "%s REFUSED <%08d>",
glob->server_connection_msg, glob->svc_cnt);
fflush(fp);
if (http == 1) PRINT_HTML_HEADER;
fprintf( fp, HTML_HEAD_TITLE, "ACCESS DENIED", glob->la[100]);
disp_file(glob, glob->header, fp);
fprintf(fp, "%s", glob->la[97]);
disp_file(glob, glob->footer, fp);
PRINT_HTML_FOOTER;
close_ldap_connections(glob);
exit_tweb(0);
}
glob->is_proxy = FALSE;
while(fgets( in, BUFSIZ-1, fp ) && *trimright(in, WSPACE) ) {
if(strstr(in, "User-Agent:")){
strcpy(agent, in);
if(strstr(str_tolower(in), PROXY_TOKEN1) ||
strstr(in, PROXY_TOKEN2))
glob->is_proxy = TRUE;
}
if(strstr(in, "Via:")){
strcpy(via, in);
glob->is_proxy = TRUE;
}
}
if (dosyslog){
char useragent[BUFSIZ];
sprintf(useragent, "%s (%s,%u) %s",
*agent ? agent : "User-Agent: unknown",
ip_addr, ip_port, via);
glob->user_agent_msg = strdup(useragent);
}
/* check if access is allowed ... */
glob->allowed =
( hp
&& ((check4access(str_tolower(hp->h_name), glob) == OK))
&& !( glob->no_proxy && glob->is_proxy
&& !charray_inlist(glob->allow_proxy, hp->h_name)
)
);
}
/* end of function: checkwwwclient */
PUBLIC void decide_access(glob)
GLOB_STRUCT *glob;
{
if(!glob->allowed) {
/* access from a non allowed computer
==> put webdn/webpw on a alternative value (if existant) */
glob->webdn = glob->webdn2;
glob->webpw = glob->webpw2;
glob->noauth = TRUE;
if (dosyslog) syslog (LOG_INFO, "%s DENIED <%08d>",
glob->server_connection_msg, glob->svc_cnt);
} else {
/* if allowed and not strict: list persons without limits */
if (!glob->strict) glob->max_person = 0;
if (dosyslog) syslog (LOG_INFO, "%s ALLOWED <%08d>",
glob->server_connection_msg, glob->svc_cnt);
}
if (dosyslog) syslog (LOG_INFO, "%s <%08d>",
glob->user_agent_msg, glob->svc_cnt);
/* non configured max-person means full listing */
if (!glob->max_person) glob->max_person = 100000;
/* if result-lists shall be restricted: configure display of
privacy-message */
glob->legal = glob->legal && (!glob->allowed || glob->strict);
/* if browsing should be restricted: configure no_browse-variable */
glob->no_browse = glob->no_browse &&
(glob->noauth || glob->strict);
}
/* end of function: decide_access */
/* Read ip_refuse dat_file and build up the data structure */
PUBLIC void get_ip_refuse_clients(glob)
GLOB_STRUCT *glob;
{
if ( glob->ip_refuse ) {
FILE *rfp;
char inLine[BUFSIZ];
char *inLineP;
size_t buflen = REFU_BUFSIZ;
size_t curlen = (size_t) 1;
if(!(rfp = fopen(glob->ip_refuse->dat_file, "r"))) {
return;
}
if ( glob->ip_refuse->refu_str ) free( glob->ip_refuse->refu_str );
glob->ip_refuse->refu_str = ch_calloc( 1, REFU_BUFSIZ );
*glob->ip_refuse->refu_str = '&';
while(fgets(inLine, BUFSIZ-1, rfp)) {
int inLen;
if ( ( inLineP = strchr( inLine, '#' ) )) *inLineP = '\0';
inLineP = trim(inLine, " \t\n");
if ( *inLineP == '\0' ) continue;
inLen = strlen( inLineP );
if ( !( curlen + inLen + 1 < buflen )) {
glob->ip_refuse->refu_str =
ch_realloc( glob->ip_refuse->refu_str,
buflen + REFU_BUFSIZ );
buflen += REFU_BUFSIZ;
}
sprintf( glob->ip_refuse->refu_str, "%s%s&",
glob->ip_refuse->refu_str, inLineP );
curlen += inLen;
}
fclose( rfp );
}
} /* get_ip_refuse_clients */
/* Routine needed to initialize structure in init.c */
/* Test the incomming IP address for denial */
PUBLIC int
check_ip_denial( ip_connection, glob )
struct sockaddr_in *ip_connection;
GLOB_STRUCT *glob;
{
int res = OK;
if ( glob->ip_refuse ) {
char ip_address[18];
sprintf( ip_address, "&%s&", inet_ntoa( ip_connection->sin_addr ));
if ( strstr( glob->ip_refuse->refu_str, ip_address ))
res = NOTOK;
}
return( res );
} /* check_ip_denial */
/* re-read IP-REFUSE file if necessary */
PUBLIC void
re_readIPrefuse( glob )
GLOB_STRUCT *glob;
{
static int ip_refuse_reload = 0;
if ( glob->ip_refuse &&
!( ++ip_refuse_reload % glob->ip_refuse->rereadcycle )) {
get_ip_refuse_clients( glob );
}
} /* re_readIPrefuse */
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