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source: trunk/src/sh_socket.c@ 120

Last change on this file since 120 was 118, checked in by rainer, 17 years ago
Fix for ticket #74 (local DoS attack on yule on BSD systems lacking the getpeereid() call).
File size: 26.7 KB

Line
1	/* SAMHAIN file system integrity testing */
2	/* Copyright (C) 2003,2005 Rainer Wichmann */
3	/* */
4	/* This program is free software; you can redistribute it */
5	/* and/or modify */
6	/* it under the terms of the GNU General Public License as */
7	/* published by */
8	/* the Free Software Foundation; either version 2 of the License, or */
9	/* (at your option) any later version. */
10	/* */
11	/* This program is distributed in the hope that it will be useful, */
12	/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
13	/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
14	/* GNU General Public License for more details. */
15	/* */
16	/* You should have received a copy of the GNU General Public License */
17	/* along with this program; if not, write to the Free Software */
18	/* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
19
20	#include "config_xor.h"
21
22	/* define if you want debug info
23	* #define SH_DEBUG_SOCKET
24	*/
25
26	#include <stdio.h>
27	#include <stdlib.h>
28	#include <stddef.h>
29	#include <string.h>
30
31	#include "samhain.h"
32	#include "sh_socket.h"
33	#include "sh_error.h"
34	#include "sh_unix.h"
35	#include "sh_calls.h"
36
37	#undef FIL__
38	#define FIL__ _("sh_socket.c")
39
40	#if defined (SH_WITH_CLIENT)
41
42	#include <signal.h>
43
44	void sh_socket_server_cmd(const char * srvcmd)
45	{
46	SL_ENTER(_("sh_tools_server_cmd"));
47
48	if ((srvcmd == NULL) \|\| (srvcmd[0] == '\0') \|\| (sl_strlen(srvcmd) < 4))
49	{
50	SL_RET0(_("sh_socket_server_cmd"));
51	}
52	if ((srvcmd[0] == 'S') \|\| (srvcmd[1] == 'T') \|\|
53	(srvcmd[2] == 'O') \|\| (srvcmd[3] == 'P'))
54	{
55	TPT((0, FIL__, __LINE__, _("msg=<stop command from server>\n")));
56	#ifdef SIGQUIT
57	raise(SIGQUIT);
58	#else
59	TPT((0, FIL__, __LINE__, _("msg=<sigquit not defined>\n")));
60	#endif
61	}
62	else if ((srvcmd[0] == 'R') \|\| (srvcmd[1] == 'E') \|\|
63	(srvcmd[2] == 'L') \|\| (srvcmd[3] == 'O') \|\|
64	(srvcmd[4] == 'A') \|\| (srvcmd[5] == 'D'))
65	{
66	TPT((0, FIL__, __LINE__, _("msg=<reload command from server>\n")));
67	#ifdef SIGHUP
68	raise(SIGHUP);
69	#else
70	TPT((0, FIL__, __LINE__, _("msg=<sighup not defined>\n")));
71	#endif
72	}
73	else
74	{
75	sh_error_handle(SH_ERR_INFO, FIL__, __LINE__, 0, MSG_E_SUBGEN,
76	srvcmd,
77	_("sh_socket_server_cmd"));
78	}
79	SL_RET0(_("sh_socket_server_cmd"));
80	}
81	/* #if defined (SH_WITH_CLIENT)
82	*/
83	#endif
84
85	#if defined(SH_WITH_SERVER)
86	#include <errno.h>
87
88	#include <sys/types.h>
89	#include <sys/stat.h>
90
91	#include <unistd.h>
92	#include <fcntl.h>
93
94	#include <time.h>
95
96	#include <sys/socket.h>
97	#include <sys/un.h>
98
99
100	#ifdef HAVE_SYS_UIO_H
101	#include <sys/uio.h>
102	#endif
103	#if !defined(HAVE_GETPEEREID) && !defined(SO_PEERCRED)
104	#if defined(HAVE_STRUCT_CMSGCRED) \|\| defined(HAVE_STRUCT_FCRED) \|\| defined(HAVE_STRUCT_SOCKCRED)
105	#include <sys/param.h>
106	#include <sys/ucred.h>
107	#endif
108	#endif
109
110
111	int pf_unix_fd = -1;
112	static char * sh_sockname = NULL;
113	static char sh_sockpass_real[SOCKPASS_MAX+1];
114
115	struct socket_cmd {
116	char cmd[SH_MAXMSGLEN];
117	char clt[SH_MAXMSGLEN];
118	char cti[81];
119	struct socket_cmd * next;
120	};
121
122	#if !defined(O_NONBLOCK)
123	#if defined(O_NDELAY)
124	#define O_NONBLOCK O_NDELAY
125	#else
126	#define O_NONBLOCK 0
127	#endif
128	#endif
129
130	#if !defined(AF_FILE)
131	#define AF_FILE AF_UNIX
132	#endif
133
134	static struct socket_cmd * cmdlist = NULL;
135	static struct socket_cmd * runlist = NULL;
136
137	static int sh_socket_flaguse = S_FALSE;
138	static int sh_socket_flaguid = 0;
139
140	#include "sh_utils.h"
141
142
143	struct reload_cmd {
144	char clt[SH_MAXMSGLEN];
145	time_t cti;
146	struct reload_cmd * next;
147	};
148	static struct reload_cmd * reloadlist = NULL;
149
150	void sh_socket_add2reload (const char * clt)
151	{
152	struct reload_cmd * new = reloadlist;
153
154	while (new)
155	{
156	if (0 == sl_strcmp(new->clt, clt))
157	{
158	sl_strlcpy (new->clt, clt, SH_MAXMSGLEN);
159	new->cti = time(NULL);
160	return;
161	}
162	new = new->next;
163	}
164
165	new = SH_ALLOC(sizeof(struct reload_cmd));
166	sl_strlcpy (new->clt, clt, SH_MAXMSGLEN);
167	new->cti = time(NULL);
168
169	new->next = reloadlist;
170	reloadlist = new;
171
172	return;
173	}
174
175	#include "zAVLTree.h"
176	#include "sh_html.h"
177	#include "sh_tools.h"
178	static void sh_socket_add2list (struct socket_cmd * in);
179
180	static void sh_socket_probe4reload ()
181	{
182	struct reload_cmd * new;
183	struct socket_cmd cmd;
184
185	zAVLCursor avlcursor;
186	client_t * item;
187	extern zAVLTree * all_clients;
188
189	char * file;
190	unsigned long dummy;
191	struct stat buf;
192
193	for (item = (client_t *) zAVLFirst(&avlcursor, all_clients); item;
194	item = (client_t *) zAVLNext(&avlcursor))
195	{
196	if (item->status_now != CLT_INACTIVE)
197	{
198	file = get_client_conf_file (item->hostname, &dummy);
199
200	if (0 == stat (file, &buf))
201	{
202	new = reloadlist;
203	while (new)
204	{
205	if (0 == sl_strcmp(new->clt, item->hostname))
206	{
207	if (buf.st_mtime > new->cti)
208	{
209	/* reload */
210	sl_strlcpy(cmd.cmd, _("RELOAD"), SH_MAXMSGLEN);
211	sl_strlcpy(cmd.clt, item->hostname, SH_MAXMSGLEN);
212	sh_socket_add2list (&cmd);
213	}
214	break;
215	}
216	new = new->next;
217	}
218	}
219	}
220	}
221	return;
222	}
223
224	char * sh_get_sockpass ()
225	{
226	size_t j = 0;
227
228	while (skey->sh_sockpass[2*j] != '\0' && j < sizeof(sh_sockpass_real))
229	{
230	sh_sockpass_real[j] = skey->sh_sockpass[2*j];
231	++j;
232	}
233	sh_sockpass_real[j] = '\0';
234
235	return sh_sockpass_real;
236	}
237
238	void sh_set_sockpass ()
239	{
240	int j;
241	for (j = 0; j < 15; ++j)
242	{
243	sh_sockpass_real[j] = '\0';
244	}
245	}
246
247	int sh_socket_use (const char * c)
248	{
249	return sh_util_flagval(c, &sh_socket_flaguse);
250	}
251
252	int sh_socket_remove ()
253	{
254	int retval = 0;
255	#ifdef S_ISSOCK
256	struct stat sbuf;
257	#endif
258
259	SL_ENTER(_("sh_socket_remove"));
260
261	if (NULL == sh_sockname)
262	{
263	SL_RETURN((retval),_("sh_socket_remove"));
264	}
265
266	if (0 != tf_trust_check (DEFAULT_PIDDIR, SL_YESPRIV))
267	{
268	SL_RETURN((-1),_("sh_socket_remove"));
269	}
270
271	if ( (retry_lstat(FIL__, __LINE__, sh_sockname, &sbuf) == 0) &&
272	(sbuf.st_uid == getuid()))
273	{
274	#ifdef S_ISSOCK
275	if (S_ISSOCK (sbuf.st_mode))
276	{
277	retval = retry_aud_unlink (FIL__, __LINE__, sh_sockname);
278	}
279	#else
280	retval = retry_aud_unlink (FIL__, __LINE__, sh_sockname);
281	#endif
282	}
283	SL_RETURN((retval),_("sh_socket_remove"));
284	}
285
286	#if !defined(HAVE_GETPEEREID) && !defined(SO_PEERCRED) && !defined(HAVE_STRUCT_CMSGCRED) && !defined(HAVE_STRUCT_FCRED) && !(defined(HAVE_STRUCT_SOCKCRED) && defined(LOCAL_CREDS))
287
288	#define NEED_PASSWORD_AUTH
289
290	#endif
291
292	int sh_socket_uid (const char * c)
293	{
294	uid_t val = (uid_t) strtol (c, (char **)NULL, 10);
295	sh_socket_flaguid = val;
296	#if defined(NEED_PASSWORD_AUTH)
297	sh_error_handle(SH_ERR_WARN, FIL__, __LINE__, errno, MSG_E_SUBGEN,
298	_("Config option SetSocketAllowUID not supported, use SetSocketPassword"),
299	_("sh_socket_uid"));
300	#endif
301	return 0;
302	}
303
304	int sh_socket_password (const char * c)
305	{
306	#if defined(NEED_PASSWORD_AUTH)
307	int j, i;
308
309	#define LCG(n) ((69069 * n) & 0xffffffffUL)
310
311	i = sl_strlen(c);
312	if (i > SOCKPASS_MAX) {
313	return -1;
314	}
315	for (j = 0; j < (2*SOCKPASS_MAX+1); ++j)
316	{
317	skey->sh_sockpass[j] = '\0';
318	}
319	for (j = 0; j < i; ++j)
320	{
321	skey->sh_sockpass[2*j] = c[j];
322	skey->sh_sockpass[(2*j)+1] = (LCG(c[j]) % 256);
323	}
324	return 0;
325	#else
326	sh_error_handle(SH_ERR_WARN, FIL__, __LINE__, errno, MSG_E_SUBGEN,
327	_("Config option SetSocketPassword not supported, use SetSocketAllowUID"),
328	_("sh_socket_password"));
329	(void) c;
330	return 0;
331	#endif
332	}
333
334
335	int sh_socket_open_int ()
336	{
337	struct sockaddr_un name;
338	size_t size;
339	int flags;
340	#if defined(SO_PASSCRED)
341	socklen_t optval = 1;
342	#endif
343	struct stat buf;
344
345	SL_ENTER(_("sh_socket_open_int"));
346
347	if (sh_socket_flaguse == S_FALSE)
348	{
349	SL_RETURN(0, _("sh_socket_open_int"));
350	}
351
352	if (sh_sockname == NULL)
353	{
354	size = sl_strlen(DEFAULT_PIDDIR) + 1 + sl_strlen(SH_INSTALL_NAME) + 6;
355	sh_sockname = SH_ALLOC(size); /* compile-time constant */
356	sl_strlcpy(sh_sockname, DEFAULT_PIDDIR, size);
357	sl_strlcat(sh_sockname, "/", size);
358	sl_strlcat(sh_sockname, SH_INSTALL_NAME, size);
359	sl_strlcat(sh_sockname, _(".sock"), size);
360	}
361
362	pf_unix_fd = socket (PF_UNIX, SOCK_STREAM, 0);
363	if ((pf_unix_fd) < 0)
364	{
365	sh_error_handle ((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
366	sh_error_message (errno),
367	_("sh_socket_open_int: socket"));
368	SL_RETURN( (-1), _("sh_socket_open_int"));
369	}
370
371	if (sizeof(name.sun_path) < (1 + sl_strlen(sh_sockname)))
372	{
373	close(pf_unix_fd); pf_unix_fd = -1;
374	sh_error_handle ((-1), FIL__, __LINE__, -1, MSG_E_SUBGEN,
375	_("PID dir path too long"),
376	_("sh_socket_open_int"));
377	SL_RETURN( (-1), _("sh_socket_open_int"));
378	}
379
380	name.sun_family = AF_FILE;
381	sl_strlcpy (name.sun_path, sh_sockname, sizeof(name.sun_path));
382
383	size = (offsetof (struct sockaddr_un, sun_path)
384	+ strlen (name.sun_path) + 1);
385
386	flags = retry_lstat (FIL__, __LINE__, sh_sockname, &buf);
387
388	if (flags == 0)
389	{
390	sh_error_handle(SH_ERR_INFO, FIL__, __LINE__, -1, MSG_E_SUBGEN,
391	_("Socket exists, trying to unlink it"),
392	_("sh_socket_open_int"));
393	if (sh_socket_remove() < 0)
394	{
395	close(pf_unix_fd); pf_unix_fd = -1;
396	sh_error_handle ((-1), FIL__, __LINE__, -1, MSG_E_SUBGEN,
397	_("Unlink of socket failed, maybe path not trusted"),
398	_("sh_socket_open_int"));
399	SL_RETURN( (-1), _("sh_socket_open_int"));
400	}
401	}
402
403	if (bind ((pf_unix_fd), (struct sockaddr *) &name, size) < 0)
404	{
405	close(pf_unix_fd); pf_unix_fd = -1;
406	sh_error_handle ((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
407	sh_error_message (errno),
408	_("sh_socket_open_int: bind"));
409	SL_RETURN( (-1), _("sh_socket_open_int"));
410	}
411
412	#ifdef SO_PASSCRED
413	if (0 != setsockopt(pf_unix_fd, SOL_SOCKET, SO_PASSCRED,
414	&optval, sizeof(optval)))
415	{
416	close(pf_unix_fd); pf_unix_fd = -1;
417	sh_error_handle ((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
418	sh_error_message (errno),
419	_("sh_socket_open_int: setsockopt"));
420	SL_RETURN( (-1), _("sh_socket_open_int"));
421	}
422	#endif
423
424	flags = fcntl((pf_unix_fd), F_GETFL);
425	if (flags < 0)
426	{
427	close(pf_unix_fd); pf_unix_fd = -1;
428	sh_error_handle ((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
429	sh_error_message (errno),
430	_("sh_socket_open_int: fcntl1"));
431	SL_RETURN( (-1), _("sh_socket_open_int"));
432	}
433
434	flags = fcntl((pf_unix_fd), F_SETFL, flags\|O_NONBLOCK);
435	if (flags < 0)
436	{
437	close(pf_unix_fd); pf_unix_fd = -1;
438	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
439	sh_error_message (errno),
440	_("sh_socket_open_int: fcntl2"));
441	SL_RETURN( (-1), _("sh_socket_open_int"));
442	}
443
444	if (0 != listen(pf_unix_fd, 5))
445	{
446	close(pf_unix_fd); pf_unix_fd = -1;
447	sh_error_handle ((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
448	sh_error_message (errno),
449	_("sh_socket_open_int: listen"));
450	SL_RETURN( (-1), _("sh_socket_open_int"));
451	}
452	SL_RETURN( (0), _("sh_socket_open_int"));
453	}
454	/* #if !defined(HAVE_CMSGCRED) \|\| !defined(SO_PEERCRED) */
455	/* #endif */
456
457	/*
458	#if !defined(HAVE_GETPEEREID) && !defined(SO_PEERCRED) && !defined(HAVE_STRUCT_CMSGCRED) && !defined(HAVE_STRUCT_FCRED) && !(defined(HAVE_STRUCT_SOCKCRED) && defined(LOCAL_CREDS))
459	static
460	int sh_socket_read (struct socket_cmd * srvcmd)
461	{
462	srvcmd->cmd[0] = '\0';
463	srvcmd->clt[0] = '\0';
464	return 0;
465	}
466	#else
467	*/
468
469	/*
470	* Parts of the socket authentication code is copied from PostgreSQL:
471	*
472	* PostgreSQL Database Management System
473	* (formerly known as Postgres, then as Postgres95)
474	*
475	* Portions Copyright (c) 1996-2001, The PostgreSQL Global Development Group
476	*
477	* Portions Copyright (c) 1994, The Regents of the University of California
478	*
479	* Permission to use, copy, modify, and distribute this software and its
480	* documentation for any purpose, without fee, and without a written agreement
481	* is hereby granted, provided that the above copyright notice and this
482	* paragraph and the following two paragraphs appear in all copies.
483	*
484	* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
485	* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING
486	* LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
487	* DOCUMENTATION, EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE
488	* POSSIBILITY OF SUCH DAMAGE.
489	*
490	* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
491	* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
492	* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
493	* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATIONS TO
494	* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
495	*/
496	static
497	int sh_socket_read (struct socket_cmd * srvcmd)
498	{
499	struct socket_cmd * list_cmd;
500	char message[SH_MAXMSG];
501	struct sockaddr_un name;
502	int size;
503	int nbytes;
504	int talkfd;
505	int retry = 0;
506
507	char * cmd = NULL;
508	char * clt = NULL;
509
510	int client_uid = -1;
511
512
513	struct msghdr msg;
514	struct iovec iov;
515
516	#if defined(NEED_PASSWORD_AUTH)
517	char * eopw = NULL;
518	char * goodpassword = NULL;
519	#endif
520
521	#if defined(HAVE_GETPEEREID)
522	uid_t peer_uid;
523	gid_t peer_gid;
524	#elif defined(SO_PEERCRED)
525	struct ucred cr;
526	#ifdef HAVE_SOCKLEN_T
527	socklen_t cl = sizeof(cr);
528	#else
529	int cl = sizeof(cr);
530	#endif
531
532	#elif defined(HAVE_STRUCT_CMSGCRED) \|\| defined(HAVE_STRUCT_FCRED) \|\| (defined(HAVE_STRUCT_SOCKCRED) && defined(LOCAL_CREDS))
533
534	#ifdef HAVE_STRUCT_CMSGCRED
535	typedef struct cmsgcred Cred;
536	#define CRED_UID cmcred_uid
537
538	#elif HAVE_STRUCT_FCRED
539	typedef struct fcred Cred;
540	#define CRED_UID fc_uid
541
542	#elif HAVE_STRUCT_SOCKCRED
543	typedef struct sockcred Cred;
544	#define CRED_UID sc_uid
545
546	#endif
547	Cred *cred;
548
549	/* Compute size without padding */
550	char cmsgmem[ALIGN(sizeof(struct cmsghdr)) + ALIGN(sizeof(Cred))];
551	/* for NetBSD */
552
553	/* Point to start of first structure */
554	struct cmsghdr cmsg = (struct cmsghdr ) cmsgmem;
555	#endif
556
557	if (pf_unix_fd < 0)
558	{
559	return 0;
560	}
561
562	iov.iov_base = (char *) &message;
563	iov.iov_len = sizeof(message);
564
565	memset (&msg, 0, sizeof (msg));
566	msg.msg_iov = &iov;
567	msg.msg_iovlen = 1;
568
569	#if !defined(SO_PEERCRED) && !defined(HAVE_GETPEEREID)
570	#if defined(HAVE_STRUCT_CMSGCRED) \|\| defined(HAVE_STRUCT_FCRED) \|\| (defined(HAVE_STRUCT_SOCKCRED) && defined(LOCAL_CREDS))
571	msg.msg_control = (char *) cmsg;
572	msg.msg_controllen = sizeof (cmsgmem);
573	memset (cmsg, 0, sizeof (cmsgmem));
574	#endif
575	#endif
576
577	/* the socket is non-blocking
578	* 'name' is the address of the sender socket
579	*/
580	size = sizeof (name);
581	talkfd = retry_accept(FIL__, __LINE__,
582	pf_unix_fd, (struct sockaddr *) & name, &size);
583	if ((talkfd < 0) && (errno == EAGAIN))
584	{
585	return 0;
586	}
587	else if (talkfd < 0)
588	{
589	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
590	sh_error_message (errno),
591	_("sh_socket_read: accept"));
592	return -1;
593	}
594
595
596	#if defined(LOCAL_CREDS) && !defined(SO_PEERCRED) && !defined(HAVE_GETPEEREID)
597	/* Set the socket to receive credentials on the next message
598	*/
599	{
600	int on = 1;
601	if (setsockopt (talkfd, 0, LOCAL_CREDS, &on, sizeof (on)) < 0)
602	{
603	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
604	sh_error_message (errno),
605	_("sh_socket_read: setsockopt"));
606	close(talkfd);
607	return -1;
608	}
609	}
610	#endif
611
612	do {
613	nbytes = recvmsg (talkfd, &msg, 0);
614	if ((nbytes < 0) && (errno != EAGAIN))
615	{
616	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
617	sh_error_message (errno),
618	_("sh_socket_read: recvmsg"));
619	close(talkfd);
620	return -1;
621	}
622	else if (nbytes < 0)
623	{
624	++retry;
625	retry_msleep(0, 1);
626	}
627	} while ((nbytes < 0) && (retry < 3));
628
629	#ifdef SH_DEBUG_SOCKET
630	fprintf(stderr, "%d bytes received\n", nbytes);
631	#endif
632
633	/* msg.msg_iov.iov_base, filled by recvmsg
634	*/
635	message[sizeof(message)-1] = '\0';
636
637	if (nbytes < 0)
638	{
639	if (errno == EAGAIN)
640	{
641	/* no data */
642	close(talkfd);
643	return 0;
644	}
645	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
646	sh_error_message (errno),
647	_("sh_socket_read: recvfrom"));
648	close(talkfd);
649	return -1;
650	}
651
652	#if defined(HAVE_GETPEEREID)
653	if (0 != getpeereid(talkfd, &peer_uid, &peer_gid))
654	{
655	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
656	sh_error_message (errno),
657	_("sh_socket_read: getpeereid"));
658	close(talkfd);
659	return -1;
660	}
661	client_uid = peer_uid;
662	cmd = message;
663	#elif defined(SO_PEERCRED)
664	if (0 != getsockopt(talkfd, SOL_SOCKET, SO_PEERCRED, &cr, &cl))
665	{
666	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
667	sh_error_message (errno),
668	_("sh_socket_read: getsockopt"));
669	close(talkfd);
670	return -1;
671	}
672	client_uid = cr.uid;
673	cmd = message;
674	#elif defined(HAVE_STRUCT_CMSGCRED) \|\| defined(HAVE_STRUCT_FCRED) \|\| (defined(HAVE_STRUCT_SOCKCRED) && defined(LOCAL_CREDS))
675	if (cmsg->cmsg_len < sizeof (cmsgmem) \|\| cmsg->cmsg_type != SCM_CREDS)
676	{
677	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
678	_("Message from recvmsg() was not SCM_CREDS"),
679	_("sh_socket_read"));
680
681	/* Check for file descriptors sent using SCM_RIGHTS, and
682	* close them. If MSG_CTRUNC is set, the buffer was too small,
683	* and no fds are duped.
684	*/
685	if (msg.msg_controllen >= sizeof(struct cmsghdr) &&
686	(msg.msg_flags & MSG_CTRUNC) == 0)
687	{
688	unsigned int data_size;
689	unsigned int data_i;
690	int fdcount, fdmax;
691	struct cmsghdr * cmptr;
692	int fdsbuf[1 + (sizeof(cmsgmem)/sizeof(int))];
693
694	for (cmptr = CMSG_FIRSTHDR(&msg); cmptr != NULL;
695	cmptr = CMSG_NXTHDR(&msg, cmptr))
696	{
697	if (cmptr->cmsg_len > sizeof (cmsgmem) \|\|
698	cmptr->cmsg_level != SOL_SOCKET \|\|
699	cmptr->cmsg_type != SCM_RIGHTS)
700	continue;
701
702	/* Crappy way of finding the data length.
703	* cmptr->cmsg_len includes both header and padding,
704	* how are you supposed to find the data length?
705	* cmptr->cmsg_len - ALIGN(sizeof(struct cmsghdr)) ?
706	*/
707	data_size = 0;
708
709	for (data_i = 0; data_i < cmptr->cmsg_len; ++data_i)
710	{
711	if (CMSG_LEN(data_i) == cmptr->cmsg_len)
712	{
713	data_size = data_i;
714	break;
715	}
716	}
717	memcpy(fdsbuf, CMSG_DATA(cmptr), data_size);
718	fdmax = data_size / sizeof(int);
719	for (fdcount = 0; fdcount < fdmax; ++fdcount)
720	(void) close(fdsbuf[fdcount]);
721	}
722	}
723
724	close(talkfd);
725	return -1;
726	}
727	cred = (Cred *) CMSG_DATA (cmsg);
728	client_uid = cred->CRED_UID;
729	cmd = message;
730	#elif defined(NEED_PASSWORD_AUTH)
731	goodpassword = sh_get_sockpass();
732	eopw = strchr(message, '@');
733	if (eopw)
734	*eopw = '\0';
735	/*
736	* message is null-terminated and >> goodpassword
737	*/
738	if (0 == strcmp(goodpassword, message) &&
739	strlen(goodpassword) < (sizeof(message)/2))
740	{
741	client_uid = sh_socket_flaguid;
742	cmd = &message[strlen(goodpassword)+1];
743	sh_set_sockpass();
744	}
745	else
746	{
747	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
748	_("Bad password"),
749	_("sh_socket_read"));
750	sh_set_sockpass();
751	close(talkfd);
752	return -1;
753	}
754	#else
755	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
756	_("Socket credentials not supported on this OS"),
757	_("sh_socket_read"));
758	close(talkfd);
759	return -1;
760	#endif
761
762	#ifdef SH_DEBUG_SOCKET
763	fprintf(stderr, "Peer uid=%d, required=%d\n",
764	client_uid, sh_socket_flaguid);
765	#endif
766
767	if (client_uid != sh_socket_flaguid)
768	{
769	sh_error_handle((-1), FIL__, __LINE__, client_uid, MSG_E_SUBGEN,
770	_("client does not have required uid"),
771	_("sh_socket_read: getsockopt"));
772	close(talkfd);
773	return -1;
774	}
775
776
777	/* Give a diagnostic message.
778	*/
779	#ifdef SH_DEBUG_SOCKET
780	fprintf (stderr, "Server: got message: %s\n", cmd);
781	#endif
782
783	clt = strchr(cmd, ':');
784	if (clt != NULL)
785	{
786	*clt = '\0'; ++clt;
787	if (sl_strlen(cmd) >= SH_MAXMSGLEN)
788	{
789	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
790	_("Bad message format: command too long"),
791	_("sh_socket_read"));
792	close(talkfd);
793	return -1;
794	}
795	else if (sl_strlen(clt) >= SH_MAXMSGLEN)
796	{
797	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
798	_("Bad message format: hostname too long"),
799	_("sh_socket_read"));
800	close(talkfd);
801	return -1;
802	}
803	if (cmd[0] == 'L' && cmd[1] == 'I' &&
804	cmd[2] == 'S' && cmd[3] == 'T')
805	{
806	goto list_all;
807	}
808	else if (cmd[0] == 'P' && cmd[1] == 'R' &&
809	cmd[2] == 'O' && cmd[3] == 'B' && cmd[4] == 'E')
810	{
811	sh_socket_probe4reload();
812	cmd[0] = 'L'; cmd[1] = 'I'; cmd[2] = 'S'; cmd[3] = 'T';cmd[4] = '\0';
813	goto list_all;
814	}
815	sl_strlcpy (srvcmd->cmd, cmd, SH_MAXMSGLEN);
816	sl_strlcpy (srvcmd->clt, clt, SH_MAXMSGLEN);
817	--clt; *clt = ':';
818	}
819	else
820	{
821	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
822	_("Bad message format"),
823	_("sh_socket_read"));
824	close(talkfd);
825	return -1;
826	}
827
828	/* Bounce the message back to the sender.
829	* 'name' is the receiver address; it has been been filled
830	* with the sender address in the recvfrom call
831	*/
832	#ifdef SH_DEBUG_SOCKET
833	fprintf (stderr, "Server: send message: %s to %s\n",
834	cmd, name.sun_path);
835	#endif
836	/*
837	nbytes = sendto (pf_unix_fd, message, nbytes, 0,
838	(struct sockaddr *) & name, size);
839	*/
840	nbytes = send (talkfd, cmd, strlen(cmd) + 1, 0);
841	close(talkfd);
842	if (nbytes < 0)
843	{
844	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
845	sh_error_message (errno),
846	_("sh_socket_read: send"));
847	return -1;
848	}
849	#ifdef SH_DEBUG_SOCKET
850	fprintf (stderr, "Server: message is out\n");
851	#endif
852	return nbytes;
853
854	list_all:
855	#ifdef SH_DEBUG_SOCKET
856	fprintf (stderr, "Server: list all\n");
857	#endif
858	if (cmd[4] == 'A' && cmd[5] == 'L' && cmd[6] == 'L')
859	{
860	list_cmd = runlist;
861	while (list_cmd)
862	{
863	sl_snprintf(message, sizeof(message), _("SENT %8s %32s %s"),
864	list_cmd->cmd, list_cmd->clt, list_cmd->cti);
865	/*
866	sl_strlcpy(message, _("DONE"), SH_MAXMSG);
867	sl_strlcat(message, " ", SH_MAXMSG);
868	sl_strlcat(message, list_cmd->cmd, SH_MAXMSG);
869	sl_strlcat(message, " ", SH_MAXMSG);
870	sl_strlcat(message, list_cmd->clt, SH_MAXMSG);
871	sl_strlcat(message, " ", SH_MAXMSG);
872	sl_strlcat(message, list_cmd->cti, SH_MAXMSG);
873	*/
874	nbytes = send (talkfd, message, sl_strlen(message) + 1, 0);
875	if (nbytes < 0)
876	{
877	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
878	sh_error_message (errno),
879	_("sh_socket_read: sendto"));
880	close(talkfd);
881	return -1;
882	}
883	list_cmd = list_cmd->next;
884	}
885	}
886
887	list_cmd = cmdlist;
888	while (list_cmd)
889	{
890	sl_snprintf(message, sizeof(message), _(">>>> %8s %32s %s"),
891	list_cmd->cmd, list_cmd->clt, list_cmd->cti);
892	/*
893	sl_strlcpy(message, _(">>>>"), SH_MAXMSG);
894	sl_strlcat(message, " ", SH_MAXMSG);
895	sl_strlcat(message, list_cmd->cmd, SH_MAXMSG);
896	sl_strlcat(message, " ", SH_MAXMSG);
897	sl_strlcat(message, list_cmd->clt, SH_MAXMSG);
898	sl_strlcat(message, " ", SH_MAXMSG);
899	sl_strlcat(message, list_cmd->cti, SH_MAXMSG);
900	*/
901	/*
902	nbytes = sendto (pf_unix_fd, message, sl_strlen(message) + 1, 0,
903	(struct sockaddr *) & name, size);
904	*/
905	nbytes = send (talkfd, message, sl_strlen(message) + 1, 0);
906	if (nbytes < 0)
907	{
908	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
909	sh_error_message (errno),
910	_("sh_socket_read: sendto"));
911	close(talkfd);
912	return -1;
913	}
914	list_cmd = list_cmd->next;
915	}
916
917	/*
918	nbytes = sendto (pf_unix_fd, _("END"), 4, 0,
919	(struct sockaddr *) & name, size);
920	*/
921	nbytes = send (talkfd, _("END"), 4, 0);
922	close(talkfd);
923	return 0;
924	}
925	/* #if !defined(HAVE_CMSGCRED) \|\| !defined(SO_PEERCRED) */
926	/* #endif */
927
928	static void sh_socket_add2list (struct socket_cmd * in)
929	{
930	struct socket_cmd * new;
931
932	new = SH_ALLOC(sizeof(struct socket_cmd));
933	sl_strlcpy (new->cmd, in->cmd, sizeof(new->cmd));
934	sl_strlcpy (new->clt, in->clt, sizeof(new->clt));
935	sl_strlcpy (new->cti, sh_unix_time(0), sizeof(new->cti));
936	new->next = cmdlist;
937	cmdlist = new;
938
939	return;
940	}
941
942	static void sh_socket_add2run (struct socket_cmd * in)
943	{
944	struct socket_cmd * new = runlist;
945	char * client_name = in->clt;
946
947	while (new)
948	{
949	if (0 == sl_strcmp(new->clt, client_name))
950	{
951	sl_strlcpy (new->cmd, in->cmd, sizeof(new->cmd));
952	sl_strlcpy (new->clt, in->clt, sizeof(new->clt));
953	sl_strlcpy (new->cti, sh_unix_time(0), sizeof(new->cti));
954	return;
955	}
956	new = new->next;
957	}
958
959	new = SH_ALLOC(sizeof(struct socket_cmd));
960	sl_strlcpy (new->cmd, in->cmd, sizeof(new->cmd));
961	sl_strlcpy (new->clt, in->clt, sizeof(new->clt));
962	sl_strlcpy (new->cti, sh_unix_time(0), sizeof(new->cti));
963	new->next = runlist;
964	runlist = new;
965
966	return;
967	}
968
969
970
971	static void sh_socket_rm2list (const char * client_name)
972	{
973	struct socket_cmd * old = cmdlist;
974	struct socket_cmd * new = cmdlist;
975
976	while (new)
977	{
978	if (0 == sl_strcmp(new->clt, client_name))
979	{
980	if ((new == cmdlist) && (new->next == NULL))
981	{
982	cmdlist = NULL;
983	SH_FREE(new);
984	return;
985	}
986	else if (new == cmdlist)
987	{
988	cmdlist = new->next;
989	SH_FREE(new);
990	return;
991	}
992	else
993	{
994	old->next = new->next;
995	SH_FREE(new);
996	return;
997	}
998	}
999	old = new;
1000	new = new->next;
1001	}
1002	return;
1003	}
1004
1005	/* poll the socket to gather input
1006	*/
1007	int sh_socket_poll()
1008	{
1009	struct socket_cmd cmd;
1010	char cancel_cmd[SH_MAXMSGLEN];
1011
1012	/* struct pollfd sh_poll = { pf_unix_fd, POLLIN, 0 }; */
1013
1014	if (pf_unix_fd < 0)
1015	{
1016	return 0;
1017	}
1018
1019	sl_strlcpy(cancel_cmd, _("CANCEL"), sizeof(cancel_cmd));
1020
1021	while (sh_socket_read (&cmd) > 0)
1022	{
1023	if (0 == sl_strcmp(cmd.cmd, cancel_cmd))
1024	{
1025	sh_socket_rm2list (cmd.clt);
1026	}
1027	else
1028	{
1029	sh_socket_rm2list (cmd.clt);
1030	sh_socket_add2list (&cmd);
1031	}
1032	}
1033	return 0;
1034	}
1035
1036	/* return the command associated with client_name
1037	and remove the corresponding entry
1038	*/
1039	char * sh_socket_check(const char * client_name)
1040	{
1041	struct socket_cmd * old = cmdlist;
1042	struct socket_cmd * new = cmdlist;
1043	static char out[SH_MAXMSGLEN];
1044
1045	while (new)
1046	{
1047	if (0 == sl_strcmp(new->clt, client_name))
1048	{
1049	sl_strlcpy(out, new->cmd, sizeof(out));
1050	sh_socket_add2run (new);
1051	sh_socket_rm2list (client_name);
1052	return out;
1053	}
1054	old = new;
1055	new = new->next;
1056	}
1057	return NULL;
1058	}
1059
1060	/* #if defined (SH_WITH_SERVER)
1061	*/
1062	#endif
1063

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