/* $OpenBSD: yp.c,v 1.14 2015/02/11 01:26:00 pelikan Exp $ */
/*
* Copyright (c) 2008 Pierre-Yves Ritschard <pyr@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <sys/tree.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <event.h>
#include <fcntl.h>
#include <unistd.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <rpc/rpc.h>
#include <rpc/xdr.h>
#include <rpc/pmap_clnt.h>
#include <rpc/pmap_prot.h>
#include <rpc/pmap_rmt.h>
#include <rpcsvc/yp.h>
#include <rpcsvc/ypclnt.h>
#include "ypldap.h"
void yp_dispatch(struct svc_req *, SVCXPRT *);
void yp_disable_events(void);
void yp_fd_event(int, short, void *);
int yp_check(struct svc_req *);
int yp_valid_domain(char *, struct ypresp_val *);
void yp_make_val(struct ypresp_val *, char *, int);
void yp_make_keyval(struct ypresp_key_val *, char *, char *);
static struct env *env;
struct yp_event {
TAILQ_ENTRY(yp_event) ye_entry;
struct event ye_event;
};
struct yp_data {
SVCXPRT *yp_trans_udp;
SVCXPRT *yp_trans_tcp;
TAILQ_HEAD(, yp_event) yd_events;
};
void
yp_disable_events(void)
{
struct yp_event *ye;
while ((ye = TAILQ_FIRST(&env->sc_yp->yd_events)) != NULL) {
TAILQ_REMOVE(&env->sc_yp->yd_events, ye, ye_entry);
event_del(&ye->ye_event);
free(ye);
}
}
void
yp_enable_events(void)
{
int i;
struct yp_event *ye;
for (i = 0; i < getdtablesize(); i++) {
if ((ye = calloc(1, sizeof(*ye))) == NULL)
fatal(NULL);
event_set(&ye->ye_event, i, EV_READ, yp_fd_event, NULL);
event_add(&ye->ye_event, NULL);
TAILQ_INSERT_TAIL(&env->sc_yp->yd_events, ye, ye_entry);
}
}
void
yp_fd_event(int fd, short event, void *p)
{
svc_getreq_common(fd);
yp_disable_events();
yp_enable_events();
}
void
yp_init(struct env *x_env)
{
struct yp_data *yp;
if ((yp = calloc(1, sizeof(*yp))) == NULL)
fatal(NULL);
TAILQ_INIT(&yp->yd_events);
env = x_env;
env->sc_yp = yp;
(void)pmap_unset(YPPROG, YPVERS);
if ((yp->yp_trans_udp = svcudp_create(RPC_ANYSOCK)) == NULL)
fatal("cannot create udp service");
if ((yp->yp_trans_tcp = svctcp_create(RPC_ANYSOCK, 0, 0)) == NULL)
fatal("cannot create tcp service");
if (!svc_register(yp->yp_trans_udp, YPPROG, YPVERS,
yp_dispatch, IPPROTO_UDP)) {
fatal("unable to register (YPPROG, YPVERS, udp)");
}
if (!svc_register(yp->yp_trans_tcp, YPPROG, YPVERS,
yp_dispatch, IPPROTO_TCP)) {
fatal("unable to register (YPPROG, YPVERS, tcp)");
}
}
/*
* lots of inspiration from ypserv by Mats O Jansson
*/
void
yp_dispatch(struct svc_req *req, SVCXPRT *trans)
{
xdrproc_t xdr_argument;
xdrproc_t xdr_result;
char *result;
char *(*cb)(char *, struct svc_req *);
union {
domainname ypproc_domain_2_arg;
domainname ypproc_domain_nonack_2_arg;
ypreq_key ypproc_match_2_arg;
ypreq_nokey ypproc_first_2_arg;
ypreq_key ypproc_next_2_arg;
ypreq_xfr ypproc_xfr_2_arg;
ypreq_nokey ypproc_all_2_arg;
ypreq_nokey ypproc_master_2_arg;
ypreq_nokey ypproc_order_2_arg;
domainname ypproc_maplist_2_arg;
} argument;
xdr_argument = (xdrproc_t) xdr_void;
xdr_result = (xdrproc_t) xdr_void;
cb = NULL;
switch (req->rq_proc) {
case YPPROC_NULL:
xdr_argument = (xdrproc_t) xdr_void;
xdr_result = (xdrproc_t) xdr_void;
if (yp_check(req) == -1)
return;
result = NULL;
if (!svc_sendreply(trans, (xdrproc_t) xdr_void,
(void *)&result))
svcerr_systemerr(trans);
return;
case YPPROC_DOMAIN:
xdr_argument = (xdrproc_t) xdr_domainname;
xdr_result = (xdrproc_t) xdr_bool;
if (yp_check(req) == -1)
return;
cb = (void *)ypproc_domain_2_svc;
break;
case YPPROC_DOMAIN_NONACK:
xdr_argument = (xdrproc_t) xdr_domainname;
xdr_result = (xdrproc_t) xdr_bool;
if (yp_check(req) == -1)
return;
cb = (void *)ypproc_domain_nonack_2_svc;
break;
case YPPROC_MATCH:
xdr_argument = (xdrproc_t) xdr_ypreq_key;
xdr_result = (xdrproc_t) xdr_ypresp_val;
if (yp_check(req) == -1)
return;
cb = (void *)ypproc_match_2_svc;
break;
case YPPROC_FIRST:
xdr_argument = (xdrproc_t) xdr_ypreq_nokey;
xdr_result = (xdrproc_t) xdr_ypresp_key_val;
if (yp_check(req) == -1)
return;
cb = (void *)ypproc_first_2_svc;
break;
case YPPROC_NEXT:
xdr_argument = (xdrproc_t) xdr_ypreq_key;
xdr_result = (xdrproc_t) xdr_ypresp_key_val;
if (yp_check(req) == -1)
return;
cb = (void *)ypproc_next_2_svc;
break;
case YPPROC_XFR:
if (yp_check(req) == -1)
return;
svcerr_noproc(trans);
return;
case YPPROC_CLEAR:
log_debug("ypproc_clear");
if (yp_check(req) == -1)
return;
svcerr_noproc(trans);
return;
case YPPROC_ALL:
log_debug("ypproc_all");
xdr_argument = (xdrproc_t) xdr_ypreq_nokey;
xdr_result = (xdrproc_t) xdr_ypresp_all;
if (yp_check(req) == -1)
return;
cb = (void *)ypproc_all_2_svc;
break;
case YPPROC_MASTER:
log_debug("ypproc_master");
xdr_argument = (xdrproc_t) xdr_ypreq_nokey;
xdr_result = (xdrproc_t) xdr_ypresp_master;
if (yp_check(req) == -1)
return;
cb = (void *)ypproc_master_2_svc;
break;
case YPPROC_ORDER:
log_debug("ypproc_order");
if (yp_check(req) == -1)
return;
svcerr_noproc(trans);
return;
case YPPROC_MAPLIST:
log_debug("ypproc_maplist");
xdr_argument = (xdrproc_t) xdr_domainname;
xdr_result = (xdrproc_t) xdr_ypresp_maplist;
if (yp_check(req) == -1)
return;
cb = (void *)ypproc_maplist_2_svc;
break;
default:
svcerr_noproc(trans);
return;
}
(void)memset(&argument, 0, sizeof(argument));
if (!svc_getargs(trans, xdr_argument, (caddr_t)&argument)) {
svcerr_decode(trans);
return;
}
result = (*cb)((char *)&argument, req);
if (result != NULL && !svc_sendreply(trans, xdr_result, result))
svcerr_systemerr(trans);
if (!svc_freeargs(trans, xdr_argument, (caddr_t)&argument)) {
/*
* ypserv does it too.
*/
fatal("unable to free arguments");
}
}
int
yp_check(struct svc_req *req)
{
/*
* We might want to know who we allow here.
*/
return (0);
}
int
yp_valid_domain(char *domain, struct ypresp_val *res)
{
if (domain == NULL) {
log_debug("NULL domain !");
return (-1);
}
if (strcmp(domain, env->sc_domainname) != 0) {
res->stat = YP_NODOM;
return (-1);
}
return (0);
}
bool_t *
ypproc_domain_2_svc(domainname *arg, struct svc_req *req)
{
static bool_t res;
res = (bool_t)1;
if (strcmp(*arg, env->sc_domainname) != 0)
res = (bool_t)0;
return (&res);
}
bool_t *
ypproc_domain_nonack_2_svc(domainname *arg, struct svc_req *req)
{
static bool_t res;
if (strcmp(*arg, env->sc_domainname) != 0)
return NULL;
res = (bool_t)1;
return (&res);
}
ypresp_val *
ypproc_match_2_svc(ypreq_key *arg, struct svc_req *req)
{
struct userent ukey;
struct userent *ue;
struct groupent gkey;
struct groupent *ge;
static struct ypresp_val res;
const char *estr;
char *bp, *cp;
char *key;
log_debug("matching '%.*s' in map %s", arg->key.keydat_len,
arg->key.keydat_val, arg->map);
if (yp_valid_domain(arg->domain, (struct ypresp_val *)&res) == -1)
return (&res);
if (env->sc_user_names == NULL) {
/*
* tree not ready.
*/
return (NULL);
}
if (arg->key.keydat_len > YPMAXRECORD) {
log_debug("argument too long");
return (NULL);
}
key = calloc(arg->key.keydat_len + 1, 1);
if (key == NULL)
return (NULL);
(void)strncpy(key, arg->key.keydat_val, arg->key.keydat_len);
if (strcmp(arg->map, "passwd.byname") == 0 ||
strcmp(arg->map, "master.passwd.byname") == 0) {
ukey.ue_line = key;
if ((ue = RB_FIND(user_name_tree, env->sc_user_names,
&ukey)) == NULL) {
res.stat = YP_NOKEY;
goto out;
}
yp_make_val(&res, ue->ue_line, 1);
goto out;
} else if (strcmp(arg->map, "passwd.byuid") == 0 ||
strcmp(arg->map, "master.passwd.byuid") == 0) {
ukey.ue_uid = strtonum(key, 0, UID_MAX, &estr);
if (estr) {
res.stat = YP_BADARGS;
goto out;
}
if ((ue = RB_FIND(user_uid_tree, &env->sc_user_uids,
&ukey)) == NULL) {
res.stat = YP_NOKEY;
goto out;
}
yp_make_val(&res, ue->ue_line, 1);
return (&res);
} else if (strcmp(arg->map, "group.bygid") == 0) {
gkey.ge_gid = strtonum(key, 0, GID_MAX, &estr);
if (estr) {
res.stat = YP_BADARGS;
goto out;
}
if ((ge = RB_FIND(group_gid_tree, &env->sc_group_gids,
&gkey)) == NULL) {
res.stat = YP_NOKEY;
goto out;
}
yp_make_val(&res, ge->ge_line, 1);
return (&res);
} else if (strcmp(arg->map, "group.byname") == 0) {
gkey.ge_line = key;
if ((ge = RB_FIND(group_name_tree, env->sc_group_names,
&gkey)) == NULL) {
res.stat = YP_NOKEY;
goto out;
}
yp_make_val(&res, ge->ge_line, 1);
return (&res);
} else if (strcmp(arg->map, "netid.byname") == 0) {
bp = cp = key;
if (strncmp(bp, "unix.", strlen("unix.")) != 0) {
res.stat = YP_BADARGS;
goto out;
}
bp += strlen("unix.");
if (*bp == '\0') {
res.stat = YP_BADARGS;
goto out;
}
if (!(cp = strsep(&bp, "@"))) {
res.stat = YP_BADARGS;
goto out;
}
if (strcmp(bp, arg->domain) != 0) {
res.stat = YP_BADARGS;
goto out;
}
ukey.ue_uid = strtonum(cp, 0, UID_MAX, &estr);
if (estr) {
res.stat = YP_BADARGS;
goto out;
}
if ((ue = RB_FIND(user_uid_tree, &env->sc_user_uids,
&ukey)) == NULL) {
res.stat = YP_NOKEY;
goto out;
}
yp_make_val(&res, ue->ue_netid_line, 0);
goto out;
} else {
log_debug("unknown map %s", arg->map);
res.stat = YP_NOMAP;
goto out;
}
out:
free(key);
return (&res);
}
ypresp_key_val *
ypproc_first_2_svc(ypreq_nokey *arg, struct svc_req *req)
{
static struct ypresp_key_val res;
if (yp_valid_domain(arg->domain, (struct ypresp_val *)&res) == -1)
return (&res);
if (strcmp(arg->map, "passwd.byname") == 0 ||
strcmp(arg->map, "master.passwd.byname") == 0) {
if (env->sc_user_lines == NULL)
return (NULL);
yp_make_keyval(&res, env->sc_user_lines, env->sc_user_lines);
} else if (strcmp(arg->map, "group.byname") == 0) {
if (env->sc_group_lines == NULL)
return (NULL);
yp_make_keyval(&res, env->sc_group_lines, env->sc_group_lines);
} else {
log_debug("unknown map %s", arg->map);
res.stat = YP_NOMAP;
}
return (&res);
}
ypresp_key_val *
ypproc_next_2_svc(ypreq_key *arg, struct svc_req *req)
{
struct userent ukey;
struct userent *ue;
struct groupent gkey;
struct groupent *ge;
char *line;
static struct ypresp_key_val res;
char *key;
if (yp_valid_domain(arg->domain, (struct ypresp_val *)&res) == -1)
return (&res);
key = NULL;
if (strcmp(arg->map, "passwd.byname") == 0 ||
strcmp(arg->map, "master.passwd.byname") == 0) {
key = calloc(arg->key.keydat_len + 1, 1);
if (key == NULL) {
res.stat = YP_YPERR;
return (&res);
}
(void)strncpy(key, arg->key.keydat_val,
arg->key.keydat_len);
ukey.ue_line = key;
if ((ue = RB_FIND(user_name_tree, env->sc_user_names,
&ukey)) == NULL) {
/*
* canacar's trick:
* the user might have been deleted in between calls
* to next since the tree may be modified by a reload.
* next should still return the next user in
* lexicographical order, hence insert the search key
* and look up the next field, then remove it again.
*/
RB_INSERT(user_name_tree, env->sc_user_names, &ukey);
if ((ue = RB_NEXT(user_name_tree, &env->sc_user_names,
&ukey)) == NULL) {
RB_REMOVE(user_name_tree, env->sc_user_names,
&ukey);
res.stat = YP_NOKEY;
free(key);
return (&res);
}
RB_REMOVE(user_name_tree, env->sc_user_names, &ukey);
}
line = ue->ue_line + (strlen(ue->ue_line) + 1);
line = line + (strlen(line) + 1);
yp_make_keyval(&res, line, line);
free(key);
return (&res);
} else if (strcmp(arg->map, "group.byname") == 0) {
key = calloc(arg->key.keydat_len + 1, 1);
if (key == NULL) {
res.stat = YP_YPERR;
return (&res);
}
(void)strncpy(key, arg->key.keydat_val,
arg->key.keydat_len);
gkey.ge_line = key;
if ((ge = RB_FIND(group_name_tree, env->sc_group_names,
&gkey)) == NULL) {
/*
* canacar's trick reloaded.
*/
RB_INSERT(group_name_tree, env->sc_group_names, &gkey);
if ((ge = RB_NEXT(group_name_tree, &env->sc_group_names,
&gkey)) == NULL) {
RB_REMOVE(group_name_tree, env->sc_group_names,
&gkey);
res.stat = YP_NOKEY;
free(key);
return (&res);
}
RB_REMOVE(group_name_tree, env->sc_group_names, &gkey);
}
line = ge->ge_line + (strlen(ge->ge_line) + 1);
line = line + (strlen(line) + 1);
yp_make_keyval(&res, line, line);
free(key);
return (&res);
} else {
log_debug("unknown map %s", arg->map);
res.stat = YP_NOMAP;
return (&res);
}
}
ypresp_all *
ypproc_all_2_svc(ypreq_nokey *arg, struct svc_req *req)
{
static struct ypresp_all res;
if (yp_valid_domain(arg->domain, (struct ypresp_val *)&res) == -1)
return (&res);
svcerr_auth(req->rq_xprt, AUTH_FAILED);
return (NULL);
}
ypresp_master *
ypproc_master_2_svc(ypreq_nokey *arg, struct svc_req *req)
{
static struct ypresp_master res;
static char master[YPMAXPEER + 1];
memset(&res, 0, sizeof(res));
if (yp_valid_domain(arg->domain, (struct ypresp_val *)&res) == -1)
return (&res);
if (gethostname(master, sizeof(master)) == 0) {
res.peer = (peername)master;
res.stat = YP_TRUE;
} else
res.stat = YP_NOKEY;
return (&res);
}
ypresp_maplist *
ypproc_maplist_2_svc(domainname *arg, struct svc_req *req)
{
size_t i;
static struct {
char *name;
int cond;
} mapnames[] = {
{ "passwd.byname", YPMAP_PASSWD_BYNAME },
{ "passwd.byuid", YPMAP_PASSWD_BYUID },
{ "master.passwd.byname", YPMAP_MASTER_PASSWD_BYNAME },
{ "master.passwd.byuid", YPMAP_MASTER_PASSWD_BYUID },
{ "group.byname", YPMAP_GROUP_BYNAME },
{ "group.bygid", YPMAP_GROUP_BYGID },
{ "netid.byname", YPMAP_NETID_BYNAME },
};
static ypresp_maplist res;
static struct ypmaplist maps[nitems(mapnames)];
if (yp_valid_domain(*arg, (struct ypresp_val *)&res) == -1)
return (&res);
res.stat = YP_TRUE;
res.maps = NULL;
for (i = 0; i < nitems(mapnames); i++) {
if (!(env->sc_flags & mapnames[i].cond))
continue;
maps[i].map = mapnames[i].name;
maps[i].next = res.maps;
res.maps = &maps[i];
}
return (&res);
}
void
yp_make_val(struct ypresp_val *res, char *line, int replacecolon)
{
static char buf[LINE_WIDTH];
memset(buf, 0, sizeof(buf));
if (replacecolon)
line[strlen(line)] = ':';
(void)strlcpy(buf, line, sizeof(buf));
if (replacecolon)
line[strcspn(line, ":")] = '\0';
log_debug("sending out %s", buf);
res->stat = YP_TRUE;
res->val.valdat_len = strlen(buf);
res->val.valdat_val = buf;
}
void
yp_make_keyval(struct ypresp_key_val *res, char *key, char *line)
{
static char keybuf[YPMAXRECORD+1];
static char buf[LINE_WIDTH];
memset(keybuf, 0, sizeof(keybuf));
memset(buf, 0, sizeof(buf));
(void)strlcpy(keybuf, key, sizeof(keybuf));
res->key.keydat_len = strlen(keybuf);
res->key.keydat_val = keybuf;
if (*line == '\0') {
res->stat = YP_NOMORE;
return;
}
res->stat = YP_TRUE;
line[strlen(line)] = ':';
(void)strlcpy(buf, line, sizeof(buf));
line[strcspn(line, ":")] = '\0';
log_debug("sending out %s => %s", keybuf, buf);
res->val.valdat_len = strlen(buf);
res->val.valdat_val = buf;
}
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