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/* source: xio-tcpwrap.c */
/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
/* Published under the GNU General Public License V.2, see file COPYING */
/* this file contains the source for tcpwrapper handling stuff */
#include "xiosysincludes.h"
#if WITH_LIBWRAP
#include "tcpd.h"
#endif
#include "xioopen.h"
#include "xio-tcpwrap.h"
#if (WITH_TCP || WITH_UDP) && WITH_LIBWRAP
const struct optdesc opt_tcpwrappers = { "tcpwrappers", "tcpwrap", OPT_TCPWRAPPERS, GROUP_RANGE, PH_ACCEPT, TYPE_STRING_NULL, OFUNC_SPEC };
const struct optdesc opt_tcpwrap_etc = { "tcpwrap-etc", "tcpwrap-dir", OPT_TCPWRAP_ETC, GROUP_RANGE, PH_ACCEPT, TYPE_FILENAME, OFUNC_SPEC };
#if defined(HAVE_HOSTS_ALLOW_TABLE)
const struct optdesc opt_tcpwrap_hosts_allow_table = { "tcpwrap-hosts-allow-table", "allow-table", OPT_TCPWRAP_HOSTS_ALLOW_TABLE, GROUP_RANGE, PH_ACCEPT, TYPE_FILENAME, OFUNC_SPEC };
#endif
#if defined(HAVE_HOSTS_DENY_TABLE)
const struct optdesc opt_tcpwrap_hosts_deny_table = { "tcpwrap-hosts-deny-table", "deny-table", OPT_TCPWRAP_HOSTS_DENY_TABLE, GROUP_RANGE, PH_ACCEPT, TYPE_FILENAME, OFUNC_SPEC };
#endif
/* they are declared only externally with libwrap and would be unresolved
without these definitions */
int allow_severity=10, deny_severity=10;
/* returns 0 if option was found and could be applied
returns 1 if option was not found
returns -1 if option was found but failed */
int xio_retropt_tcpwrap(xiosingle_t *xfd, struct opt *opts) {
bool dolibwrap = false;
dolibwrap =
retropt_string(opts, OPT_TCPWRAPPERS,
&xfd->para.socket.ip.libwrapname) >= 0 || dolibwrap;
dolibwrap =
retropt_string(opts, OPT_TCPWRAP_ETC,
&xfd->para.socket.ip.tcpwrap_etc) >= 0 || dolibwrap;
#if defined(HAVE_HOSTS_ALLOW_TABLE)
dolibwrap =
retropt_string(opts, OPT_TCPWRAP_HOSTS_ALLOW_TABLE,
&xfd->para.socket.ip.hosts_allow_table) >= 0 || dolibwrap;
#endif
#if defined(HAVE_HOSTS_DENY_TABLE)
dolibwrap =
retropt_string(opts, OPT_TCPWRAP_HOSTS_DENY_TABLE,
&xfd->para.socket.ip.hosts_deny_table) >= 0 || dolibwrap;
#endif
if (dolibwrap) {
xfd->para.socket.ip.dolibwrap = true;
if (xfd->para.socket.ip.libwrapname == NULL) {
xfd->para.socket.ip.libwrapname = (char *)diag_get_string('p');
}
#if defined(HAVE_HOSTS_ALLOW_TABLE) || defined(HAVE_HOSTS_DENY_TABLE)
if (xfd->para.socket.ip.tcpwrap_etc) {
if (xfd->para.socket.ip.hosts_allow_table == NULL) {
xfd->para.socket.ip.hosts_allow_table =
Malloc(strlen(xfd->para.socket.ip.tcpwrap_etc)+1+11+1);
sprintf(xfd->para.socket.ip.hosts_allow_table, "%s/hosts.allow",
xfd->para.socket.ip.tcpwrap_etc);
}
if (xfd->para.socket.ip.hosts_deny_table == NULL) {
xfd->para.socket.ip.hosts_deny_table =
Malloc(strlen(xfd->para.socket.ip.tcpwrap_etc)+1+10+1);
sprintf(xfd->para.socket.ip.hosts_deny_table, "%s/hosts.deny",
xfd->para.socket.ip.tcpwrap_etc);
}
}
#endif /* defined(HAVE_HOSTS_ALLOW_TABLE) || defined(HAVE_HOSTS_DENY_TABLE) */
return 0;
}
return 1;
}
/* returns -1 if forbidden, 0 if no tcpwrap check, or 1 if explicitely allowed
*/
int xio_tcpwrap_check(xiosingle_t *xfd, union sockaddr_union *us,
union sockaddr_union *them) {
char *save_hosts_allow_table, *save_hosts_deny_table;
struct request_info ri;
#if WITH_IP6
char clientaddr[INET6_ADDRSTRLEN] = "", serveraddr[INET6_ADDRSTRLEN] = "";
#else
char clientaddr[INET_ADDRSTRLEN] = "", serveraddr[INET_ADDRSTRLEN] = "";
#endif
int allow;
if (!xfd->para.socket.ip.dolibwrap) {
return 0;
}
if (us == NULL || them == NULL) { return -1; }
#if defined(HAVE_HOSTS_ALLOW_TABLE)
save_hosts_allow_table = hosts_allow_table;
if (xfd->para.socket.ip.hosts_allow_table) {
Debug1("hosts_allow_table = \"%s\"",
xfd->para.socket.ip.hosts_allow_table);
hosts_allow_table = xfd->para.socket.ip.hosts_allow_table;
}
#endif /* defined(HAVE_HOSTS_ALLOW_TABLE) */
#if defined(HAVE_HOSTS_DENY_TABLE)
save_hosts_deny_table = hosts_deny_table;
if (xfd->para.socket.ip.hosts_deny_table) {
Debug1("hosts_deny_table = \"%s\"",
xfd->para.socket.ip.hosts_deny_table);
hosts_deny_table = xfd->para.socket.ip.hosts_deny_table;
}
#endif /* defined(HAVE_HOSTS_DENY_TABLE) */
hosts_access_verbose = 32767;
if (inet_ntop(them->soa.sa_family,
#if WITH_IP6
them->soa.sa_family==PF_INET6 ?
(void *)&them->ip6.sin6_addr :
#endif
(void *)&them->ip4.sin_addr,
clientaddr, sizeof(clientaddr)) == NULL) {
Warn1("inet_ntop(): %s", strerror(errno));
}
if (inet_ntop(us->soa.sa_family,
#if WITH_IP6
us->soa.sa_family==PF_INET6 ?
(void *)&us->ip6.sin6_addr :
#endif
(void *)&us->ip4.sin_addr,
serveraddr, sizeof(serveraddr)) == NULL) {
Warn1("inet_ntop(): %s", strerror(errno));
}
Debug7("request_init(%p, RQ_FILE, %d, RQ_CLIENT_SIN, {%s:%u}, RQ_SERVER_SIN, {%s:%u}, RQ_DAEMON, \"%s\", 0",
&ri, xfd->fd, clientaddr,
ntohs(((struct sockaddr_in *)them)->sin_port),
serveraddr, ntohs(us->ip4.sin_port),
xfd->para.socket.ip.libwrapname?xfd->para.socket.ip.libwrapname:(char *)diag_get_string('p'));
request_init(&ri, RQ_FILE, xfd->fd,
RQ_CLIENT_SIN, them,
RQ_SERVER_SIN, &us->soa,
RQ_DAEMON, xfd->para.socket.ip.libwrapname?xfd->para.socket.ip.libwrapname:(char *)diag_get_string('p'), 0);
Debug("request_init() ->");
Debug1("sock_methods(%p)", &ri);
sock_methods(&ri);
Debug("sock_methods() ->");
Debug1("hosts_access(%p)", &ri);
allow = hosts_access(&ri);
Debug1("hosts_access() -> %d", allow);
#if defined(HAVE_HOSTS_ALLOW_TABLE)
hosts_allow_table = save_hosts_allow_table;
#endif
#if defined(HAVE_HOSTS_DENY_TABLE)
hosts_deny_table = save_hosts_deny_table;
#endif
if (allow == 0) {
return -1;
}
return 1;
}
#endif /* (WITH_TCP || WITH_UDP) && WITH_LIBWRAP */
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