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source: branches/samhain-2_2-branch/src/sh_socket.c@ 500

Last change on this file since 500 was 50, checked in by rainer, 18 years ago
Fix for the fix in revision 48. Released as 2.2.1c
File size: 25.4 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	close(talkfd);
681	return -1;
682	}
683	cred = (Cred *) CMSG_DATA (cmsg);
684	client_uid = cred->CRED_UID;
685	cmd = message;
686	#elif defined(NEED_PASSWORD_AUTH)
687	goodpassword = sh_get_sockpass();
688	eopw = strchr(message, '@');
689	if (eopw)
690	*eopw = '\0';
691	/*
692	* message is null-terminated and >> goodpassword
693	*/
694	if (0 == strcmp(goodpassword, message) &&
695	strlen(goodpassword) < (sizeof(message)/2))
696	{
697	client_uid = sh_socket_flaguid;
698	cmd = &message[strlen(goodpassword)+1];
699	sh_set_sockpass();
700	}
701	else
702	{
703	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
704	_("Bad password"),
705	_("sh_socket_read"));
706	sh_set_sockpass();
707	close(talkfd);
708	return -1;
709	}
710	#else
711	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
712	_("Socket credentials not supported on this OS"),
713	_("sh_socket_read"));
714	close(talkfd);
715	return -1;
716	#endif
717
718	#ifdef SH_DEBUG_SOCKET
719	fprintf(stderr, "Peer uid=%d, required=%d\n",
720	client_uid, sh_socket_flaguid);
721	#endif
722
723	if (client_uid != sh_socket_flaguid)
724	{
725	sh_error_handle((-1), FIL__, __LINE__, client_uid, MSG_E_SUBGEN,
726	_("client does not have required uid"),
727	_("sh_socket_read: getsockopt"));
728	close(talkfd);
729	return -1;
730	}
731
732
733	/* Give a diagnostic message.
734	*/
735	#ifdef SH_DEBUG_SOCKET
736	fprintf (stderr, "Server: got message: %s\n", cmd);
737	#endif
738
739	clt = strchr(cmd, ':');
740	if (clt != NULL)
741	{
742	*clt = '\0'; ++clt;
743	if (sl_strlen(cmd) >= SH_MAXMSGLEN)
744	{
745	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
746	_("Bad message format: command too long"),
747	_("sh_socket_read"));
748	close(talkfd);
749	return -1;
750	}
751	else if (sl_strlen(clt) >= SH_MAXMSGLEN)
752	{
753	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
754	_("Bad message format: hostname too long"),
755	_("sh_socket_read"));
756	close(talkfd);
757	return -1;
758	}
759	if (cmd[0] == 'L' && cmd[1] == 'I' &&
760	cmd[2] == 'S' && cmd[3] == 'T')
761	{
762	goto list_all;
763	}
764	else if (cmd[0] == 'P' && cmd[1] == 'R' &&
765	cmd[2] == 'O' && cmd[3] == 'B' && cmd[4] == 'E')
766	{
767	sh_socket_probe4reload();
768	cmd[0] = 'L'; cmd[1] = 'I'; cmd[2] = 'S'; cmd[3] = 'T';cmd[4] = '\0';
769	goto list_all;
770	}
771	sl_strlcpy (srvcmd->cmd, cmd, SH_MAXMSGLEN);
772	sl_strlcpy (srvcmd->clt, clt, SH_MAXMSGLEN);
773	--clt; *clt = ':';
774	}
775	else
776	{
777	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
778	_("Bad message format"),
779	_("sh_socket_read"));
780	close(talkfd);
781	return -1;
782	}
783
784	/* Bounce the message back to the sender.
785	* 'name' is the receiver address; it has been been filled
786	* with the sender address in the recvfrom call
787	*/
788	#ifdef SH_DEBUG_SOCKET
789	fprintf (stderr, "Server: send message: %s to %s\n",
790	cmd, name.sun_path);
791	#endif
792	/*
793	nbytes = sendto (pf_unix_fd, message, nbytes, 0,
794	(struct sockaddr *) & name, size);
795	*/
796	nbytes = send (talkfd, cmd, strlen(cmd) + 1, 0);
797	close(talkfd);
798	if (nbytes < 0)
799	{
800	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
801	sh_error_message (errno),
802	_("sh_socket_read: send"));
803	return -1;
804	}
805	#ifdef SH_DEBUG_SOCKET
806	fprintf (stderr, "Server: message is out\n");
807	#endif
808	return nbytes;
809
810	list_all:
811	#ifdef SH_DEBUG_SOCKET
812	fprintf (stderr, "Server: list all\n");
813	#endif
814	if (cmd[4] == 'A' && cmd[5] == 'L' && cmd[6] == 'L')
815	{
816	list_cmd = runlist;
817	while (list_cmd)
818	{
819	sl_snprintf(message, sizeof(message), _("SENT %8s %32s %s"),
820	list_cmd->cmd, list_cmd->clt, list_cmd->cti);
821	/*
822	sl_strlcpy(message, _("DONE"), SH_MAXMSG);
823	sl_strlcat(message, " ", SH_MAXMSG);
824	sl_strlcat(message, list_cmd->cmd, SH_MAXMSG);
825	sl_strlcat(message, " ", SH_MAXMSG);
826	sl_strlcat(message, list_cmd->clt, SH_MAXMSG);
827	sl_strlcat(message, " ", SH_MAXMSG);
828	sl_strlcat(message, list_cmd->cti, SH_MAXMSG);
829	*/
830	nbytes = send (talkfd, message, sl_strlen(message) + 1, 0);
831	if (nbytes < 0)
832	{
833	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
834	sh_error_message (errno),
835	_("sh_socket_read: sendto"));
836	close(talkfd);
837	return -1;
838	}
839	list_cmd = list_cmd->next;
840	}
841	}
842
843	list_cmd = cmdlist;
844	while (list_cmd)
845	{
846	sl_snprintf(message, sizeof(message), _(">>>> %8s %32s %s"),
847	list_cmd->cmd, list_cmd->clt, list_cmd->cti);
848	/*
849	sl_strlcpy(message, _(">>>>"), SH_MAXMSG);
850	sl_strlcat(message, " ", SH_MAXMSG);
851	sl_strlcat(message, list_cmd->cmd, SH_MAXMSG);
852	sl_strlcat(message, " ", SH_MAXMSG);
853	sl_strlcat(message, list_cmd->clt, SH_MAXMSG);
854	sl_strlcat(message, " ", SH_MAXMSG);
855	sl_strlcat(message, list_cmd->cti, SH_MAXMSG);
856	*/
857	/*
858	nbytes = sendto (pf_unix_fd, message, sl_strlen(message) + 1, 0,
859	(struct sockaddr *) & name, size);
860	*/
861	nbytes = send (talkfd, message, sl_strlen(message) + 1, 0);
862	if (nbytes < 0)
863	{
864	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
865	sh_error_message (errno),
866	_("sh_socket_read: sendto"));
867	close(talkfd);
868	return -1;
869	}
870	list_cmd = list_cmd->next;
871	}
872
873	/*
874	nbytes = sendto (pf_unix_fd, _("END"), 4, 0,
875	(struct sockaddr *) & name, size);
876	*/
877	nbytes = send (talkfd, _("END"), 4, 0);
878	close(talkfd);
879	return 0;
880	}
881	/* #if !defined(HAVE_CMSGCRED) \|\| !defined(SO_PEERCRED) */
882	/* #endif */
883
884	static void sh_socket_add2list (struct socket_cmd * in)
885	{
886	struct socket_cmd * new;
887
888	new = SH_ALLOC(sizeof(struct socket_cmd));
889	sl_strlcpy (new->cmd, in->cmd, sizeof(new->cmd));
890	sl_strlcpy (new->clt, in->clt, sizeof(new->clt));
891	sl_strlcpy (new->cti, sh_unix_time(0), sizeof(new->cti));
892	new->next = cmdlist;
893	cmdlist = new;
894
895	return;
896	}
897
898	static void sh_socket_add2run (struct socket_cmd * in)
899	{
900	struct socket_cmd * new = runlist;
901	char * client_name = in->clt;
902
903	while (new)
904	{
905	if (0 == sl_strcmp(new->clt, client_name))
906	{
907	sl_strlcpy (new->cmd, in->cmd, sizeof(new->cmd));
908	sl_strlcpy (new->clt, in->clt, sizeof(new->clt));
909	sl_strlcpy (new->cti, sh_unix_time(0), sizeof(new->cti));
910	return;
911	}
912	new = new->next;
913	}
914
915	new = SH_ALLOC(sizeof(struct socket_cmd));
916	sl_strlcpy (new->cmd, in->cmd, sizeof(new->cmd));
917	sl_strlcpy (new->clt, in->clt, sizeof(new->clt));
918	sl_strlcpy (new->cti, sh_unix_time(0), sizeof(new->cti));
919	new->next = runlist;
920	runlist = new;
921
922	return;
923	}
924
925
926
927	static void sh_socket_rm2list (const char * client_name)
928	{
929	struct socket_cmd * old = cmdlist;
930	struct socket_cmd * new = cmdlist;
931
932	while (new)
933	{
934	if (0 == sl_strcmp(new->clt, client_name))
935	{
936	if ((new == cmdlist) && (new->next == NULL))
937	{
938	cmdlist = NULL;
939	SH_FREE(new);
940	return;
941	}
942	else if (new == cmdlist)
943	{
944	cmdlist = new->next;
945	SH_FREE(new);
946	return;
947	}
948	else
949	{
950	old->next = new->next;
951	SH_FREE(new);
952	return;
953	}
954	}
955	old = new;
956	new = new->next;
957	}
958	return;
959	}
960
961	/* poll the socket to gather input
962	*/
963	int sh_socket_poll()
964	{
965	struct socket_cmd cmd;
966	char cancel_cmd[SH_MAXMSGLEN];
967
968	/* struct pollfd sh_poll = { pf_unix_fd, POLLIN, 0 }; */
969
970	if (pf_unix_fd < 0)
971	{
972	return 0;
973	}
974
975	sl_strlcpy(cancel_cmd, _("CANCEL"), sizeof(cancel_cmd));
976
977	while (sh_socket_read (&cmd) > 0)
978	{
979	if (0 == sl_strcmp(cmd.cmd, cancel_cmd))
980	{
981	sh_socket_rm2list (cmd.clt);
982	}
983	else
984	{
985	sh_socket_rm2list (cmd.clt);
986	sh_socket_add2list (&cmd);
987	}
988	}
989	return 0;
990	}
991
992	/* return the command associated with client_name
993	and remove the corresponding entry
994	*/
995	char * sh_socket_check(const char * client_name)
996	{
997	struct socket_cmd * old = cmdlist;
998	struct socket_cmd * new = cmdlist;
999	static char out[SH_MAXMSGLEN];
1000
1001	while (new)
1002	{
1003	if (0 == sl_strcmp(new->clt, client_name))
1004	{
1005	sl_strlcpy(out, new->cmd, sizeof(out));
1006	sh_socket_add2run (new);
1007	sh_socket_rm2list (client_name);
1008	return out;
1009	}
1010	old = new;
1011	new = new->next;
1012	}
1013	return NULL;
1014	}
1015
1016	/* #if defined (SH_WITH_SERVER)
1017	*/
1018	#endif
1019

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