Context Navigation

source: trunk/src/sh_socket.c@ 248

Last change on this file since 248 was 200, checked in by katerina, 16 years ago
Implement server->client SCAN command to run file check on demand.
File size: 27.5 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	#if defined(SH_WITH_SERVER) && defined(__linux__)
26	#define _GNU_SOURCE
27	#endif
28
29	#include <stdio.h>
30	#include <stdlib.h>
31	#include <stddef.h>
32	#include <string.h>
33
34	#include "samhain.h"
35	#include "sh_socket.h"
36	#include "sh_error.h"
37	#include "sh_unix.h"
38	#include "sh_calls.h"
39
40	#undef FIL__
41	#define FIL__ _("sh_socket.c")
42
43	#if defined (SH_WITH_CLIENT)
44
45	#include <signal.h>
46
47	void sh_socket_server_cmd(const char * srvcmd)
48	{
49	SL_ENTER(_("sh_tools_server_cmd"));
50
51	if ((srvcmd == NULL) \|\| (srvcmd[0] == '\0') \|\| (sl_strlen(srvcmd) < 4))
52	{
53	SL_RET0(_("sh_socket_server_cmd"));
54	}
55	if ((srvcmd[0] == 'S') && (srvcmd[1] == 'T') &&
56	(srvcmd[2] == 'O') && (srvcmd[3] == 'P'))
57	{
58	TPT((0, FIL__, __LINE__, _("msg=<stop command from server>\n")));
59	#ifdef SIGQUIT
60	raise(SIGQUIT);
61	#else
62	sig_terminate = 1;
63	++sig_raised;
64	#endif
65	}
66	else if ((srvcmd[0] == 'R') && (srvcmd[1] == 'E') &&
67	(srvcmd[2] == 'L') && (srvcmd[3] == 'O') &&
68	(srvcmd[4] == 'A') && (srvcmd[5] == 'D'))
69	{
70	TPT((0, FIL__, __LINE__, _("msg=<reload command from server>\n")));
71	#ifdef SIGHUP
72	raise(SIGHUP);
73	#else
74	sig_config_read_again = 1;
75	++sig_raised;
76	#endif
77	}
78	else if ((srvcmd[0] == 'S') && (srvcmd[1] == 'C') &&
79	(srvcmd[2] == 'A') && (srvcmd[3] == 'N'))
80	{
81	TPT((0, FIL__, __LINE__, _("msg=<scan command from server>\n")));
82	if (sh.flag.isdaemon == ON)
83	{
84	#ifdef SIGTTOU
85	raise(SIGTTOU);
86	#else
87	sig_force_check = 1;
88	++sig_raised;
89	#endif
90	}
91	else
92	{
93	sig_force_check = 1;
94	++sig_raised;
95	}
96	}
97	else
98	{
99	sh_error_handle(SH_ERR_INFO, FIL__, __LINE__, 0, MSG_E_SUBGEN,
100	srvcmd,
101	_("sh_socket_server_cmd"));
102	}
103	SL_RET0(_("sh_socket_server_cmd"));
104	}
105	/* #if defined (SH_WITH_CLIENT)
106	*/
107	#endif
108
109	#if defined(SH_WITH_SERVER)
110	#include <errno.h>
111
112	#include <sys/types.h>
113	#include <sys/stat.h>
114
115	#include <unistd.h>
116	#include <fcntl.h>
117
118	#include <time.h>
119
120	#include <sys/socket.h>
121	#include <sys/un.h>
122
123
124	#ifdef HAVE_SYS_UIO_H
125	#include <sys/uio.h>
126	#endif
127	#if !defined(HAVE_GETPEEREID) && !defined(SO_PEERCRED)
128	#if defined(HAVE_STRUCT_CMSGCRED) \|\| defined(HAVE_STRUCT_FCRED) \|\| defined(HAVE_STRUCT_SOCKCRED)
129	#include <sys/param.h>
130	#include <sys/ucred.h>
131	#endif
132	#endif
133
134
135	int pf_unix_fd = -1;
136	static char * sh_sockname = NULL;
137	static char sh_sockpass_real[SOCKPASS_MAX+1];
138
139	struct socket_cmd {
140	char cmd[SH_MAXMSGLEN];
141	char clt[SH_MAXMSGLEN];
142	char cti[81];
143	struct socket_cmd * next;
144	};
145
146	#if !defined(O_NONBLOCK)
147	#if defined(O_NDELAY)
148	#define O_NONBLOCK O_NDELAY
149	#else
150	#define O_NONBLOCK 0
151	#endif
152	#endif
153
154	#if !defined(AF_FILE)
155	#define AF_FILE AF_UNIX
156	#endif
157
158	static struct socket_cmd * cmdlist = NULL;
159	static struct socket_cmd * runlist = NULL;
160
161	static int sh_socket_flaguse = S_FALSE;
162	static int sh_socket_flaguid = 0;
163
164	#include "sh_utils.h"
165
166
167	struct reload_cmd {
168	char clt[SH_MAXMSGLEN];
169	time_t cti;
170	struct reload_cmd * next;
171	};
172	static struct reload_cmd * reloadlist = NULL;
173
174	void sh_socket_add2reload (const char * clt)
175	{
176	struct reload_cmd * new = reloadlist;
177
178	while (new)
179	{
180	if (0 == sl_strcmp(new->clt, clt))
181	{
182	sl_strlcpy (new->clt, clt, SH_MAXMSGLEN);
183	new->cti = time(NULL);
184	return;
185	}
186	new = new->next;
187	}
188
189	new = SH_ALLOC(sizeof(struct reload_cmd));
190	sl_strlcpy (new->clt, clt, SH_MAXMSGLEN);
191	new->cti = time(NULL);
192
193	new->next = reloadlist;
194	reloadlist = new;
195
196	return;
197	}
198
199	#include "zAVLTree.h"
200	#include "sh_html.h"
201	#include "sh_tools.h"
202	static void sh_socket_add2list (struct socket_cmd * in);
203
204	static void sh_socket_probe4reload (void)
205	{
206	struct reload_cmd * new;
207	struct socket_cmd cmd;
208
209	zAVLCursor avlcursor;
210	client_t * item;
211	extern zAVLTree * all_clients;
212
213	char * file;
214	unsigned long dummy;
215	struct stat buf;
216
217	for (item = (client_t *) zAVLFirst(&avlcursor, all_clients); item;
218	item = (client_t *) zAVLNext(&avlcursor))
219	{
220	if (item->status_now != CLT_INACTIVE)
221	{
222	file = get_client_conf_file (item->hostname, &dummy);
223
224	if (0 == stat (file, &buf))
225	{
226	new = reloadlist;
227	while (new)
228	{
229	if (0 == sl_strcmp(new->clt, item->hostname))
230	{
231	if (buf.st_mtime > new->cti)
232	{
233	/* reload */
234	sl_strlcpy(cmd.cmd, _("RELOAD"), SH_MAXMSGLEN);
235	sl_strlcpy(cmd.clt, item->hostname, SH_MAXMSGLEN);
236	sh_socket_add2list (&cmd);
237	}
238	break;
239	}
240	new = new->next;
241	}
242	}
243	}
244	}
245	return;
246	}
247
248	char * sh_get_sockpass (void)
249	{
250	size_t j = 0;
251
252	while (skey->sh_sockpass[2*j] != '\0' && j < sizeof(sh_sockpass_real))
253	{
254	sh_sockpass_real[j] = skey->sh_sockpass[2*j];
255	++j;
256	}
257	sh_sockpass_real[j] = '\0';
258
259	return sh_sockpass_real;
260	}
261
262	void sh_set_sockpass (void)
263	{
264	int j;
265	for (j = 0; j < 15; ++j)
266	{
267	sh_sockpass_real[j] = '\0';
268	}
269	}
270
271	int sh_socket_use (const char * c)
272	{
273	return sh_util_flagval(c, &sh_socket_flaguse);
274	}
275
276	int sh_socket_remove ()
277	{
278	int retval = 0;
279	#ifdef S_ISSOCK
280	struct stat sbuf;
281	#endif
282
283	SL_ENTER(_("sh_socket_remove"));
284
285	if (NULL == sh_sockname)
286	{
287	SL_RETURN((retval),_("sh_socket_remove"));
288	}
289
290	if (0 != tf_trust_check (DEFAULT_PIDDIR, SL_YESPRIV))
291	{
292	SL_RETURN((-1),_("sh_socket_remove"));
293	}
294
295	if ( (retry_lstat(FIL__, __LINE__, sh_sockname, &sbuf) == 0) &&
296	(sbuf.st_uid == getuid()))
297	{
298	#ifdef S_ISSOCK
299	if (S_ISSOCK (sbuf.st_mode))
300	{
301	retval = retry_aud_unlink (FIL__, __LINE__, sh_sockname);
302	}
303	#else
304	retval = retry_aud_unlink (FIL__, __LINE__, sh_sockname);
305	#endif
306	}
307	SL_RETURN((retval),_("sh_socket_remove"));
308	}
309
310	#if !defined(HAVE_GETPEEREID) && !defined(SO_PEERCRED) && !defined(HAVE_STRUCT_CMSGCRED) && !defined(HAVE_STRUCT_FCRED) && !(defined(HAVE_STRUCT_SOCKCRED) && defined(LOCAL_CREDS))
311
312	#define NEED_PASSWORD_AUTH
313
314	#endif
315
316	int sh_socket_uid (const char * c)
317	{
318	uid_t val = (uid_t) strtol (c, (char **)NULL, 10);
319	sh_socket_flaguid = val;
320	#if defined(NEED_PASSWORD_AUTH)
321	sh_error_handle(SH_ERR_WARN, FIL__, __LINE__, errno, MSG_E_SUBGEN,
322	_("Config option SetSocketAllowUID not supported, use SetSocketPassword"),
323	_("sh_socket_uid"));
324	#endif
325	return 0;
326	}
327
328	int sh_socket_password (const char * c)
329	{
330	#if defined(NEED_PASSWORD_AUTH)
331	int j, i;
332
333	#define LCG(n) ((69069 * n) & 0xffffffffUL)
334
335	i = sl_strlen(c);
336	if (i > SOCKPASS_MAX) {
337	return -1;
338	}
339	for (j = 0; j < (2*SOCKPASS_MAX+1); ++j)
340	{
341	skey->sh_sockpass[j] = '\0';
342	}
343	for (j = 0; j < i; ++j)
344	{
345	skey->sh_sockpass[2*j] = c[j];
346	skey->sh_sockpass[(2*j)+1] = (LCG(c[j]) % 256);
347	}
348	return 0;
349	#else
350	sh_error_handle(SH_ERR_WARN, FIL__, __LINE__, errno, MSG_E_SUBGEN,
351	_("Config option SetSocketPassword not supported, use SetSocketAllowUID"),
352	_("sh_socket_password"));
353	(void) c;
354	return 0;
355	#endif
356	}
357
358
359	int sh_socket_open_int ()
360	{
361	struct sockaddr_un name;
362	size_t size;
363	int flags;
364	#if defined(SO_PASSCRED)
365	socklen_t optval = 1;
366	#endif
367	struct stat buf;
368	char errbuf[SH_ERRBUF_SIZE];
369
370	SL_ENTER(_("sh_socket_open_int"));
371
372	if (sh_socket_flaguse == S_FALSE)
373	{
374	SL_RETURN(0, _("sh_socket_open_int"));
375	}
376
377	if (sh_sockname == NULL)
378	{
379	size = sl_strlen(DEFAULT_PIDDIR) + 1 + sl_strlen(SH_INSTALL_NAME) + 6;
380	sh_sockname = SH_ALLOC(size); /* compile-time constant */
381	sl_strlcpy(sh_sockname, DEFAULT_PIDDIR, size);
382	sl_strlcat(sh_sockname, "/", size);
383	sl_strlcat(sh_sockname, SH_INSTALL_NAME, size);
384	sl_strlcat(sh_sockname, _(".sock"), size);
385	}
386
387	pf_unix_fd = socket (PF_UNIX, SOCK_STREAM, 0);
388	if ((pf_unix_fd) < 0)
389	{
390	sh_error_handle ((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
391	sh_error_message (errno, errbuf, sizeof(errbuf)),
392	_("sh_socket_open_int: socket"));
393	SL_RETURN( (-1), _("sh_socket_open_int"));
394	}
395
396	if (sizeof(name.sun_path) < (1 + sl_strlen(sh_sockname)))
397	{
398	close(pf_unix_fd); pf_unix_fd = -1;
399	sh_error_handle ((-1), FIL__, __LINE__, -1, MSG_E_SUBGEN,
400	_("PID dir path too long"),
401	_("sh_socket_open_int"));
402	SL_RETURN( (-1), _("sh_socket_open_int"));
403	}
404
405	name.sun_family = AF_FILE;
406	sl_strlcpy (name.sun_path, sh_sockname, sizeof(name.sun_path));
407
408	size = (offsetof (struct sockaddr_un, sun_path)
409	+ strlen (name.sun_path) + 1);
410
411	flags = retry_lstat (FIL__, __LINE__, sh_sockname, &buf);
412
413	if (flags == 0)
414	{
415	sh_error_handle(SH_ERR_INFO, FIL__, __LINE__, -1, MSG_E_SUBGEN,
416	_("Socket exists, trying to unlink it"),
417	_("sh_socket_open_int"));
418	if (sh_socket_remove() < 0)
419	{
420	close(pf_unix_fd); pf_unix_fd = -1;
421	sh_error_handle ((-1), FIL__, __LINE__, -1, MSG_E_SUBGEN,
422	_("Unlink of socket failed, maybe path not trusted"),
423	_("sh_socket_open_int"));
424	SL_RETURN( (-1), _("sh_socket_open_int"));
425	}
426	}
427
428	if (bind ((pf_unix_fd), (struct sockaddr *) &name, size) < 0)
429	{
430	close(pf_unix_fd); pf_unix_fd = -1;
431	sh_error_handle ((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
432	sh_error_message (errno, errbuf, sizeof(errbuf)),
433	_("sh_socket_open_int: bind"));
434	SL_RETURN( (-1), _("sh_socket_open_int"));
435	}
436
437	#ifdef SO_PASSCRED
438	if (0 != setsockopt(pf_unix_fd, SOL_SOCKET, SO_PASSCRED,
439	&optval, sizeof(optval)))
440	{
441	close(pf_unix_fd); pf_unix_fd = -1;
442	sh_error_handle ((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
443	sh_error_message (errno, errbuf, sizeof(errbuf)),
444	_("sh_socket_open_int: setsockopt"));
445	SL_RETURN( (-1), _("sh_socket_open_int"));
446	}
447	#endif
448
449	flags = fcntl((pf_unix_fd), F_GETFL);
450	if (flags < 0)
451	{
452	close(pf_unix_fd); pf_unix_fd = -1;
453	sh_error_handle ((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
454	sh_error_message (errno, errbuf, sizeof(errbuf)),
455	_("sh_socket_open_int: fcntl1"));
456	SL_RETURN( (-1), _("sh_socket_open_int"));
457	}
458
459	flags = fcntl((pf_unix_fd), F_SETFL, flags\|O_NONBLOCK);
460	if (flags < 0)
461	{
462	close(pf_unix_fd); pf_unix_fd = -1;
463	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
464	sh_error_message (errno, errbuf, sizeof(errbuf)),
465	_("sh_socket_open_int: fcntl2"));
466	SL_RETURN( (-1), _("sh_socket_open_int"));
467	}
468
469	if (0 != listen(pf_unix_fd, 5))
470	{
471	close(pf_unix_fd); pf_unix_fd = -1;
472	sh_error_handle ((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
473	sh_error_message (errno, errbuf, sizeof(errbuf)),
474	_("sh_socket_open_int: listen"));
475	SL_RETURN( (-1), _("sh_socket_open_int"));
476	}
477	SL_RETURN( (0), _("sh_socket_open_int"));
478	}
479	/* #if !defined(HAVE_CMSGCRED) \|\| !defined(SO_PEERCRED) */
480	/* #endif */
481
482	/*
483	#if !defined(HAVE_GETPEEREID) && !defined(SO_PEERCRED) && !defined(HAVE_STRUCT_CMSGCRED) && !defined(HAVE_STRUCT_FCRED) && !(defined(HAVE_STRUCT_SOCKCRED) && defined(LOCAL_CREDS))
484	static
485	int sh_socket_read (struct socket_cmd * srvcmd)
486	{
487	srvcmd->cmd[0] = '\0';
488	srvcmd->clt[0] = '\0';
489	return 0;
490	}
491	#else
492	*/
493
494	/*
495	* Parts of the socket authentication code is copied from PostgreSQL:
496	*
497	* PostgreSQL Database Management System
498	* (formerly known as Postgres, then as Postgres95)
499	*
500	* Portions Copyright (c) 1996-2001, The PostgreSQL Global Development Group
501	*
502	* Portions Copyright (c) 1994, The Regents of the University of California
503	*
504	* Permission to use, copy, modify, and distribute this software and its
505	* documentation for any purpose, without fee, and without a written agreement
506	* is hereby granted, provided that the above copyright notice and this
507	* paragraph and the following two paragraphs appear in all copies.
508	*
509	* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
510	* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING
511	* LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
512	* DOCUMENTATION, EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE
513	* POSSIBILITY OF SUCH DAMAGE.
514	*
515	* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
516	* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
517	* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
518	* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATIONS TO
519	* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
520	*/
521	static
522	int sh_socket_read (struct socket_cmd * srvcmd)
523	{
524	struct socket_cmd * list_cmd;
525	char message[SH_MAXMSG];
526	struct sockaddr_un name;
527	int size;
528	int nbytes;
529	int talkfd;
530	int retry = 0;
531
532	char * cmd = NULL;
533	char * clt = NULL;
534
535	int client_uid = -1;
536	char errbuf[SH_ERRBUF_SIZE];
537
538
539	struct msghdr msg;
540	struct iovec iov;
541
542	#if defined(NEED_PASSWORD_AUTH)
543	char * eopw = NULL;
544	char * goodpassword = NULL;
545	#endif
546
547	#if defined(HAVE_GETPEEREID)
548	uid_t peer_uid;
549	gid_t peer_gid;
550	#elif defined(SO_PEERCRED)
551	struct ucred cr;
552	#ifdef HAVE_SOCKLEN_T
553	socklen_t cl = sizeof(cr);
554	#else
555	int cl = sizeof(cr);
556	#endif
557
558	#elif defined(HAVE_STRUCT_CMSGCRED) \|\| defined(HAVE_STRUCT_FCRED) \|\| (defined(HAVE_STRUCT_SOCKCRED) && defined(LOCAL_CREDS))
559
560	#ifdef HAVE_STRUCT_CMSGCRED
561	typedef struct cmsgcred Cred;
562	#define CRED_UID cmcred_uid
563
564	#elif HAVE_STRUCT_FCRED
565	typedef struct fcred Cred;
566	#define CRED_UID fc_uid
567
568	#elif HAVE_STRUCT_SOCKCRED
569	typedef struct sockcred Cred;
570	#define CRED_UID sc_uid
571
572	#endif
573	Cred *cred;
574
575	/* Compute size without padding */
576	char cmsgmem[ALIGN(sizeof(struct cmsghdr)) + ALIGN(sizeof(Cred))];
577	/* for NetBSD */
578
579	/* Point to start of first structure */
580	struct cmsghdr cmsg = (struct cmsghdr ) cmsgmem;
581	#endif
582
583	if (pf_unix_fd < 0)
584	{
585	return 0;
586	}
587
588	iov.iov_base = (char *) &message;
589	iov.iov_len = sizeof(message);
590
591	memset (&msg, 0, sizeof (msg));
592	msg.msg_iov = &iov;
593	msg.msg_iovlen = 1;
594
595	#if !defined(SO_PEERCRED) && !defined(HAVE_GETPEEREID)
596	#if defined(HAVE_STRUCT_CMSGCRED) \|\| defined(HAVE_STRUCT_FCRED) \|\| (defined(HAVE_STRUCT_SOCKCRED) && defined(LOCAL_CREDS))
597	msg.msg_control = (char *) cmsg;
598	msg.msg_controllen = sizeof (cmsgmem);
599	memset (cmsg, 0, sizeof (cmsgmem));
600	#endif
601	#endif
602
603	/* the socket is non-blocking
604	* 'name' is the address of the sender socket
605	*/
606	size = sizeof (name);
607	talkfd = retry_accept(FIL__, __LINE__,
608	pf_unix_fd, (struct sockaddr *) & name, &size);
609	if ((talkfd < 0) && (errno == EAGAIN))
610	{
611	return 0;
612	}
613	else if (talkfd < 0)
614	{
615	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
616	sh_error_message (errno, errbuf, sizeof(errbuf)),
617	_("sh_socket_read: accept"));
618	return -1;
619	}
620
621
622	#if defined(LOCAL_CREDS) && !defined(SO_PEERCRED) && !defined(HAVE_GETPEEREID)
623	/* Set the socket to receive credentials on the next message
624	*/
625	{
626	int on = 1;
627	if (setsockopt (talkfd, 0, LOCAL_CREDS, &on, sizeof (on)) < 0)
628	{
629	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
630	sh_error_message (errno, errbuf, sizeof(errbuf)),
631	_("sh_socket_read: setsockopt"));
632	close(talkfd);
633	return -1;
634	}
635	}
636	#endif
637
638	do {
639	nbytes = recvmsg (talkfd, &msg, 0);
640	if ((nbytes < 0) && (errno != EAGAIN))
641	{
642	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
643	sh_error_message (errno, errbuf, sizeof(errbuf)),
644	_("sh_socket_read: recvmsg"));
645	close(talkfd);
646	return -1;
647	}
648	else if (nbytes < 0)
649	{
650	++retry;
651	retry_msleep(0, 1);
652	}
653	} while ((nbytes < 0) && (retry < 3));
654
655	#ifdef SH_DEBUG_SOCKET
656	fprintf(stderr, "%d bytes received\n", nbytes);
657	#endif
658
659	/* msg.msg_iov.iov_base, filled by recvmsg
660	*/
661	message[sizeof(message)-1] = '\0';
662
663	if (nbytes < 0)
664	{
665	if (errno == EAGAIN)
666	{
667	/* no data */
668	close(talkfd);
669	return 0;
670	}
671	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
672	sh_error_message (errno, errbuf, sizeof(errbuf)),
673	_("sh_socket_read: recvfrom"));
674	close(talkfd);
675	return -1;
676	}
677
678	#if defined(HAVE_GETPEEREID)
679	if (0 != getpeereid(talkfd, &peer_uid, &peer_gid))
680	{
681	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
682	sh_error_message (errno, errbuf, sizeof(errbuf)),
683	_("sh_socket_read: getpeereid"));
684	close(talkfd);
685	return -1;
686	}
687	client_uid = peer_uid;
688	cmd = message;
689	#elif defined(SO_PEERCRED)
690	if (0 != getsockopt(talkfd, SOL_SOCKET, SO_PEERCRED, &cr, &cl))
691	{
692	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
693	sh_error_message (errno, errbuf, sizeof(errbuf)),
694	_("sh_socket_read: getsockopt"));
695	close(talkfd);
696	return -1;
697	}
698	client_uid = cr.uid;
699	cmd = message;
700	#elif defined(HAVE_STRUCT_CMSGCRED) \|\| defined(HAVE_STRUCT_FCRED) \|\| (defined(HAVE_STRUCT_SOCKCRED) && defined(LOCAL_CREDS))
701	if (cmsg->cmsg_len < sizeof (cmsgmem) \|\| cmsg->cmsg_type != SCM_CREDS)
702	{
703	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
704	_("Message from recvmsg() was not SCM_CREDS"),
705	_("sh_socket_read"));
706
707	/* Check for file descriptors sent using SCM_RIGHTS, and
708	* close them. If MSG_CTRUNC is set, the buffer was too small,
709	* and no fds are duped.
710	*/
711	if (msg.msg_controllen >= sizeof(struct cmsghdr) &&
712	(msg.msg_flags & MSG_CTRUNC) == 0)
713	{
714	unsigned int data_size;
715	unsigned int data_i;
716	int fdcount, fdmax;
717	struct cmsghdr * cmptr;
718	int fdsbuf[1 + (sizeof(cmsgmem)/sizeof(int))];
719
720	for (cmptr = CMSG_FIRSTHDR(&msg); cmptr != NULL;
721	cmptr = CMSG_NXTHDR(&msg, cmptr))
722	{
723	if (cmptr->cmsg_len > sizeof (cmsgmem) \|\|
724	cmptr->cmsg_level != SOL_SOCKET \|\|
725	cmptr->cmsg_type != SCM_RIGHTS)
726	continue;
727
728	/* Crappy way of finding the data length.
729	* cmptr->cmsg_len includes both header and padding,
730	* how are you supposed to find the data length?
731	* cmptr->cmsg_len - ALIGN(sizeof(struct cmsghdr)) ?
732	*/
733	data_size = 0;
734
735	for (data_i = 0; data_i < cmptr->cmsg_len; ++data_i)
736	{
737	if (CMSG_LEN(data_i) == cmptr->cmsg_len)
738	{
739	data_size = data_i;
740	break;
741	}
742	}
743	memcpy(fdsbuf, CMSG_DATA(cmptr), data_size);
744	fdmax = data_size / sizeof(int);
745	for (fdcount = 0; fdcount < fdmax; ++fdcount)
746	(void) close(fdsbuf[fdcount]);
747	}
748	}
749
750	close(talkfd);
751	return -1;
752	}
753	cred = (Cred *) CMSG_DATA (cmsg);
754	client_uid = cred->CRED_UID;
755	cmd = message;
756	#elif defined(NEED_PASSWORD_AUTH)
757	goodpassword = sh_get_sockpass();
758	eopw = strchr(message, '@');
759	if (eopw)
760	*eopw = '\0';
761	/*
762	* message is null-terminated and >> goodpassword
763	*/
764	if (0 == strcmp(goodpassword, message) &&
765	strlen(goodpassword) < (sizeof(message)/2))
766	{
767	client_uid = sh_socket_flaguid;
768	cmd = &message[strlen(goodpassword)+1];
769	sh_set_sockpass();
770	}
771	else
772	{
773	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
774	_("Bad password"),
775	_("sh_socket_read"));
776	sh_set_sockpass();
777	close(talkfd);
778	return -1;
779	}
780	#else
781	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
782	_("Socket credentials not supported on this OS"),
783	_("sh_socket_read"));
784	close(talkfd);
785	return -1;
786	#endif
787
788	#ifdef SH_DEBUG_SOCKET
789	fprintf(stderr, "Peer uid=%d, required=%d\n",
790	client_uid, sh_socket_flaguid);
791	#endif
792
793	if (client_uid != sh_socket_flaguid)
794	{
795	sh_error_handle((-1), FIL__, __LINE__, client_uid, MSG_E_SUBGEN,
796	_("client does not have required uid"),
797	_("sh_socket_read: getsockopt"));
798	close(talkfd);
799	return -1;
800	}
801
802
803	/* Give a diagnostic message.
804	*/
805	#ifdef SH_DEBUG_SOCKET
806	fprintf (stderr, "Server: got message: %s\n", cmd);
807	#endif
808
809	clt = strchr(cmd, ':');
810	if (clt != NULL)
811	{
812	*clt = '\0'; ++clt;
813	if (sl_strlen(cmd) >= SH_MAXMSGLEN)
814	{
815	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
816	_("Bad message format: command too long"),
817	_("sh_socket_read"));
818	close(talkfd);
819	return -1;
820	}
821	else if (sl_strlen(clt) >= SH_MAXMSGLEN)
822	{
823	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
824	_("Bad message format: hostname too long"),
825	_("sh_socket_read"));
826	close(talkfd);
827	return -1;
828	}
829	if (cmd[0] == 'L' && cmd[1] == 'I' &&
830	cmd[2] == 'S' && cmd[3] == 'T')
831	{
832	goto list_all;
833	}
834	else if (cmd[0] == 'P' && cmd[1] == 'R' &&
835	cmd[2] == 'O' && cmd[3] == 'B' && cmd[4] == 'E')
836	{
837	sh_socket_probe4reload();
838	cmd[0] = 'L'; cmd[1] = 'I'; cmd[2] = 'S'; cmd[3] = 'T';cmd[4] = '\0';
839	goto list_all;
840	}
841	sl_strlcpy (srvcmd->cmd, cmd, SH_MAXMSGLEN);
842	sl_strlcpy (srvcmd->clt, clt, SH_MAXMSGLEN);
843	--clt; *clt = ':';
844	}
845	else
846	{
847	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
848	_("Bad message format"),
849	_("sh_socket_read"));
850	close(talkfd);
851	return -1;
852	}
853
854	/* Bounce the message back to the sender.
855	* 'name' is the receiver address; it has been been filled
856	* with the sender address in the recvfrom call
857	*/
858	#ifdef SH_DEBUG_SOCKET
859	fprintf (stderr, "Server: send message: %s to %s\n",
860	cmd, name.sun_path);
861	#endif
862	/*
863	nbytes = sendto (pf_unix_fd, message, nbytes, 0,
864	(struct sockaddr *) & name, size);
865	*/
866	nbytes = send (talkfd, cmd, strlen(cmd) + 1, 0);
867	close(talkfd);
868	if (nbytes < 0)
869	{
870	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
871	sh_error_message (errno, errbuf, sizeof(errbuf)),
872	_("sh_socket_read: send"));
873	return -1;
874	}
875	#ifdef SH_DEBUG_SOCKET
876	fprintf (stderr, "Server: message is out\n");
877	#endif
878	return nbytes;
879
880	list_all:
881	#ifdef SH_DEBUG_SOCKET
882	fprintf (stderr, "Server: list all\n");
883	#endif
884	if (cmd[4] == 'A' && cmd[5] == 'L' && cmd[6] == 'L')
885	{
886	list_cmd = runlist;
887	while (list_cmd)
888	{
889	sl_snprintf(message, sizeof(message), _("SENT %8s %32s %s"),
890	list_cmd->cmd, list_cmd->clt, list_cmd->cti);
891	/*
892	sl_strlcpy(message, _("DONE"), SH_MAXMSG);
893	sl_strlcat(message, " ", SH_MAXMSG);
894	sl_strlcat(message, list_cmd->cmd, SH_MAXMSG);
895	sl_strlcat(message, " ", SH_MAXMSG);
896	sl_strlcat(message, list_cmd->clt, SH_MAXMSG);
897	sl_strlcat(message, " ", SH_MAXMSG);
898	sl_strlcat(message, list_cmd->cti, SH_MAXMSG);
899	*/
900	nbytes = send (talkfd, message, sl_strlen(message) + 1, 0);
901	if (nbytes < 0)
902	{
903	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
904	sh_error_message (errno, errbuf, sizeof(errbuf)),
905	_("sh_socket_read: sendto"));
906	close(talkfd);
907	return -1;
908	}
909	list_cmd = list_cmd->next;
910	}
911	}
912
913	list_cmd = cmdlist;
914	while (list_cmd)
915	{
916	sl_snprintf(message, sizeof(message), _(">>>> %8s %32s %s"),
917	list_cmd->cmd, list_cmd->clt, list_cmd->cti);
918	/*
919	sl_strlcpy(message, _(">>>>"), SH_MAXMSG);
920	sl_strlcat(message, " ", SH_MAXMSG);
921	sl_strlcat(message, list_cmd->cmd, SH_MAXMSG);
922	sl_strlcat(message, " ", SH_MAXMSG);
923	sl_strlcat(message, list_cmd->clt, SH_MAXMSG);
924	sl_strlcat(message, " ", SH_MAXMSG);
925	sl_strlcat(message, list_cmd->cti, SH_MAXMSG);
926	*/
927	/*
928	nbytes = sendto (pf_unix_fd, message, sl_strlen(message) + 1, 0,
929	(struct sockaddr *) & name, size);
930	*/
931	nbytes = send (talkfd, message, sl_strlen(message) + 1, 0);
932	if (nbytes < 0)
933	{
934	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
935	sh_error_message (errno, errbuf, sizeof(errbuf)),
936	_("sh_socket_read: sendto"));
937	close(talkfd);
938	return -1;
939	}
940	list_cmd = list_cmd->next;
941	}
942
943	/*
944	nbytes = sendto (pf_unix_fd, _("END"), 4, 0,
945	(struct sockaddr *) & name, size);
946	*/
947	nbytes = send (talkfd, _("END"), 4, 0);
948	close(talkfd);
949	return 0;
950	}
951	/* #if !defined(HAVE_CMSGCRED) \|\| !defined(SO_PEERCRED) */
952	/* #endif */
953
954	static void sh_socket_add2list (struct socket_cmd * in)
955	{
956	struct socket_cmd * new;
957
958	new = SH_ALLOC(sizeof(struct socket_cmd));
959	sl_strlcpy (new->cmd, in->cmd, sizeof(new->cmd));
960	sl_strlcpy (new->clt, in->clt, sizeof(new->clt));
961	(void) sh_unix_time(0, new->cti, sizeof(new->cti));
962	new->next = cmdlist;
963	cmdlist = new;
964
965	return;
966	}
967
968	static void sh_socket_add2run (struct socket_cmd * in)
969	{
970	struct socket_cmd * new = runlist;
971	char * client_name = in->clt;
972
973	while (new)
974	{
975	if (0 == sl_strcmp(new->clt, client_name))
976	{
977	sl_strlcpy (new->cmd, in->cmd, sizeof(new->cmd));
978	sl_strlcpy (new->clt, in->clt, sizeof(new->clt));
979	(void) sh_unix_time(0, new->cti, sizeof(new->cti));
980	return;
981	}
982	new = new->next;
983	}
984
985	new = SH_ALLOC(sizeof(struct socket_cmd));
986	sl_strlcpy (new->cmd, in->cmd, sizeof(new->cmd));
987	sl_strlcpy (new->clt, in->clt, sizeof(new->clt));
988	(void) sh_unix_time(0, new->cti, sizeof(new->cti));
989	new->next = runlist;
990	runlist = new;
991
992	return;
993	}
994
995
996
997	static void sh_socket_rm2list (const char * client_name)
998	{
999	struct socket_cmd * old = cmdlist;
1000	struct socket_cmd * new = cmdlist;
1001
1002	while (new)
1003	{
1004	if (0 == sl_strcmp(new->clt, client_name))
1005	{
1006	if ((new == cmdlist) && (new->next == NULL))
1007	{
1008	cmdlist = NULL;
1009	SH_FREE(new);
1010	return;
1011	}
1012	else if (new == cmdlist)
1013	{
1014	cmdlist = new->next;
1015	SH_FREE(new);
1016	return;
1017	}
1018	else
1019	{
1020	old->next = new->next;
1021	SH_FREE(new);
1022	return;
1023	}
1024	}
1025	old = new;
1026	new = new->next;
1027	}
1028	return;
1029	}
1030
1031	/* poll the socket to gather input
1032	*/
1033	int sh_socket_poll()
1034	{
1035	struct socket_cmd cmd;
1036	char cancel_cmd[SH_MAXMSGLEN];
1037
1038	/* struct pollfd sh_poll = { pf_unix_fd, POLLIN, 0 }; */
1039
1040	if (pf_unix_fd < 0)
1041	{
1042	return 0;
1043	}
1044
1045	sl_strlcpy(cancel_cmd, _("CANCEL"), sizeof(cancel_cmd));
1046
1047	while (sh_socket_read (&cmd) > 0)
1048	{
1049	if (0 == sl_strcmp(cmd.cmd, cancel_cmd))
1050	{
1051	sh_socket_rm2list (cmd.clt);
1052	}
1053	else
1054	{
1055	sh_socket_rm2list (cmd.clt);
1056	sh_socket_add2list (&cmd);
1057	}
1058	}
1059	return 0;
1060	}
1061
1062	/* return the command associated with client_name
1063	and remove the corresponding entry
1064	*/
1065	char * sh_socket_check(const char * client_name)
1066	{
1067	struct socket_cmd * old = cmdlist;
1068	struct socket_cmd * new = cmdlist;
1069	static char out[SH_MAXMSGLEN];
1070
1071	while (new)
1072	{
1073	if (0 == sl_strcmp(new->clt, client_name))
1074	{
1075	sl_strlcpy(out, new->cmd, sizeof(out));
1076	sh_socket_add2run (new);
1077	sh_socket_rm2list (client_name);
1078	return out;
1079	}
1080	old = new;
1081	new = new->next;
1082	}
1083	return NULL;
1084	}
1085
1086	/* #if defined (SH_WITH_SERVER)
1087	*/
1088	#endif
1089

Note: See TracBrowser for help on using the repository browser.

Download in other formats: