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source: trunk/src/sh_gpg.c@ 201

Last change on this file since 201 was 198, checked in by katerina, 16 years ago
If debug output is chosen, don't redirect gpg stderr to /dev/null
File size: 31.8 KB

Line
1	/* SAMHAIN file system integrity testing */
2	/* Copyright (C) 1999, 2000 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	#include <stdio.h>
23	#include <stdlib.h>
24
25
26	#if defined(WITH_GPG) \|\| defined(WITH_PGP)
27
28	#include <unistd.h>
29	#include <fcntl.h>
30	#include <signal.h>
31	#if defined(SH_WITH_SERVER)
32	#include <pwd.h>
33	#endif
34	#include <sys/stat.h>
35	#include <sys/types.h>
36	#include <errno.h>
37	#include <sys/wait.h>
38
39	#include <string.h>
40	#ifdef HAVE_MEMORY_H
41	#include <memory.h>
42	#endif
43
44
45	#if !defined(O_NONBLOCK)
46	#if defined(O_NDELAY)
47	#define O_NONBLOCK O_NDELAY
48	#else
49	#define O_NONBLOCK 0
50	#endif
51	#endif
52
53
54	#include "samhain.h"
55	#include "sh_utils.h"
56	#include "sh_error.h"
57	#include "sh_tiger.h"
58	#if defined(SH_WITH_SERVER)
59	#define SH_NEED_PWD_GRP 1
60	#include "sh_static.h"
61	#endif
62
63	static struct {
64	char conf_id[SH_MINIBUF+1];
65	char conf_fp[SH_MINIBUF+1];
66	char data_id[SH_MINIBUF+1];
67	char data_fp[SH_MINIBUF+1];
68	} gp;
69
70	typedef struct {
71	pid_t pid;
72	FILE * pipe;
73	} sh_gpg_popen_t;
74
75	#define SH_GPG_OK 0
76	#define SH_GPG_BAD 1
77	#define SH_GPG_BADSIGN 2
78
79	/* replace #if 0 by #if 1 and set an appropriate path in front of '/pdbg.'
80	* for debugging
81	*/
82	#if 0
83	#define PDGBFILE "/pdbg."
84	#endif
85
86	#if defined(PDGBFILE)
87	FILE * pdbg;
88	FILE * pdbgc;
89	#define PDBG_OPEN pdbg = fopen(PDGBFILE"main", "a")
90	#define PDBG_CLOSE fclose (pdbg)
91	#define PDBG(arg) fprintf(pdbg, "PDBG: step %d\n", arg); fflush(pdbg)
92	#define PDBG_D(arg) fprintf(pdbg, "PDBG: %d\n", arg); fflush(pdbg)
93	#define PDBG_S(arg) fprintf(pdbg, "PDBG: %s\n", arg); fflush(pdbg)
94
95	#define PDBGC_OPEN pdbgc = fopen(PDGBFILE"child", "a")
96	#define PDBGC_CLOSE fclose (pdbgc)
97	#define PDBGC(arg) fprintf(pdbgc, "PDBG: step %d\n", arg); fflush(pdbgc)
98	#define PDBGC_D(arg) fprintf(pdbgc, "PDBG: %d\n", arg); fflush(pdbgc)
99	#define PDBGC_S(arg) fprintf(pdbgc, "PDBG: %s\n", arg); fflush(pdbgc)
100	#else
101	#define PDBG_OPEN
102	#define PDBG_CLOSE
103	#define PDBG(arg)
104	#define PDBG_D(arg)
105	#define PDBG_S(arg)
106	#define PDBGC_OPEN
107	#define PDBGC_CLOSE
108	#define PDBGC(arg)
109	#define PDBGC_D(arg)
110	#define PDBGC_S(arg)
111	#endif
112
113	#undef FIL__
114	#define FIL__ _("sh_gpg.c")
115
116	#ifdef GPG_HASH
117
118	static int sh_gpg_checksum (SL_TICKET checkfd, int flag)
119	{
120	char * test_gpg;
121	char * test_ptr1 = NULL;
122	char * test_ptr2 = NULL;
123	char wstrip1[128];
124	char wstrip2[128];
125	int i, k;
126	#include "sh_gpg_chksum.h"
127
128	SL_ENTER(_("sh_gpg_checksum"));
129
130	#if defined(WITH_PGP)
131	test_gpg = sh_tiger_hash_gpg (DEFAULT_PGP_PATH, checkfd, TIGER_NOLIM);
132	#else
133	test_gpg = sh_tiger_hash_gpg (DEFAULT_GPG_PATH, checkfd, TIGER_NOLIM);
134	#endif
135
136	test_ptr1 = strchr(GPG_HASH, ':');
137	if (test_gpg != NULL)
138	test_ptr2 = strchr(test_gpg, ':');
139
140	if (test_ptr2 != NULL)
141	test_ptr2 += 2;
142	else
143	test_ptr2 = test_gpg;
144	if (test_ptr1 != NULL)
145	test_ptr1 += 2;
146	else
147	test_ptr1 = GPG_HASH;
148
149	/* Tue Jun 24 23:11:54 CEST 2003 (1.7.9) -- strip whitespace
150	*/
151	k = 0;
152	for (i = 0; i < 127; ++i)
153	{
154	if (test_ptr1[i] == '\0')
155	break;
156	if (test_ptr1[i] != ' ')
157	{
158	wstrip1[k] = test_ptr1[i];
159	++k;
160	}
161	}
162	wstrip1[k] = '\0';
163
164	for(i = 0; i < KEY_LEN; ++i)
165	{
166	if (gpgchk[i] != wstrip1[i])
167	{
168	sh_error_handle(SH_ERR_SEVERE, FIL__, __LINE__, 0, MSG_E_GPG_CHK,
169	gpgchk, wstrip1);
170	break;
171	}
172	}
173
174	k = 0;
175	for (i = 0; i < 127; ++i)
176	{
177	if (test_ptr2[i] == '\0')
178	break;
179	if (test_ptr2[i] != ' ')
180	{
181	wstrip2[k] = test_ptr2[i];
182	++k;
183	}
184	}
185	wstrip2[k] = '\0';
186
187	if (0 != sl_strncmp(wstrip1, wstrip2, 127))
188	{
189	TPT(((0), FIL__, __LINE__, _("msg=<pgp checksum: %s>\n"), test_gpg));
190	TPT(((0), FIL__, __LINE__, _("msg=<Compiled-in : %s>\n"), GPG_HASH));
191	TPT(((0), FIL__, __LINE__, _("msg=<wstrip1 : %s>\n"), wstrip1));
192	TPT(((0), FIL__, __LINE__, _("msg=<wstrip2 : %s>\n"), wstrip2));
193	if (flag == 1)
194	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_GPG,
195	GPG_HASH, test_gpg);
196	dlog(1, FIL__, __LINE__, _("The compiled-in checksum of the gpg binary\n(%s)\ndoes not match the actual checksum\n(%s).\nYou need to recompile with the correct checksum."), wstrip1, wstrip2);
197	SH_FREE(test_gpg);
198	SL_RETURN((-1), _("sh_gpg_checksum"));
199	}
200	SH_FREE(test_gpg);
201	SL_RETURN( (0), _("sh_gpg_checksum"));
202	}
203	#endif
204
205	struct startup_info {
206	long line;
207	char * program;
208	long uid;
209	char * path;
210	char * key_uid;
211	char * key_id;
212	};
213
214	static struct startup_info startInfo = { 0, NULL, 0, NULL, NULL, NULL };
215
216	void sh_gpg_log_startup (void)
217	{
218	if (startInfo.program != NULL)
219	{
220	sh_error_handle ((-1), FIL__, startInfo.line, 0, MSG_START_GH,
221	startInfo.program, startInfo.uid,
222	startInfo.path,
223	startInfo.key_uid, startInfo.key_id);
224	}
225	return;
226	}
227
228	static void sh_gpg_fill_startup (long line, char * program, long uid, char * path,
229	char * key_uid, char * key_id)
230	{
231	startInfo.line = line;
232	startInfo.program = sh_util_strdup(program);
233	startInfo.uid = uid;
234	startInfo.path = sh_util_strdup(path);
235	startInfo.key_uid = sh_util_strdup(key_uid);
236	startInfo.key_id = sh_util_strdup(key_id);
237	return;
238	}
239
240	static FILE * sh_gpg_popen (sh_gpg_popen_t *source, int fd,
241	int mode, char * id, char * homedir)
242	{
243	extern int flag_err_debug;
244	int pipedes[2];
245	FILE * outf = NULL;
246	char * envp[2];
247	size_t len;
248	char path[256];
249	char cc1[32];
250	char cc2[32];
251	#if defined(WITH_PGP)
252	char cc3[32];
253	char cc0[3] = "-f";
254	#endif
255	#if defined(WITH_GPG)
256	char cc0[2] = "-";
257	char cc3[32];
258	char cc4[SH_PATHBUF+32];
259	char cc5[32] = "--no-tty";
260	#endif
261
262	char * arg[9];
263
264	#if defined(HAVE_GPG_CHECKSUM)
265	SL_TICKET checkfd;
266	int myrand;
267	int i;
268	#if defined(__linux__)
269	int get_the_fd(SL_TICKET);
270	char pname[128];
271	int pfd;
272	#endif
273	#endif
274
275	SL_ENTER(_("sh_gpg_popen"));
276
277	#if defined(WITH_GPG)
278	/* -- GnuPG -- */
279	sl_strlcpy (path, DEFAULT_GPG_PATH, 256);
280	sl_strlcpy (cc1, _("--status-fd"), 32);
281	sl_strlcpy (cc2, _("--verify"), 32);
282	sl_strlcpy (cc3, _("--homedir"), 32);
283	/* sl_strlcpy (cc4, sh.effective.home, SH_PATHBUF+32); */
284	sl_strlcpy (cc4, homedir, SH_PATHBUF+32);
285	sl_strlcat (cc4, _("/.gnupg"), SH_PATHBUF+32);
286
287	/* fprintf(stderr, "YULE: homedir=%s\n", homedir); */
288
289	#if defined(SH_WITH_SERVER)
290	if (0 == sl_ret_euid()) /* privileges not dropped yet */
291	{
292	struct stat lbuf;
293	int status_stat = 0;
294	#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_GETPWNAM_R)
295	struct passwd pwd;
296	char buffer[SH_PWBUF_SIZE];
297	struct passwd * tempres;
298	sh_getpwnam_r(DEFAULT_IDENT, &pwd, buffer, sizeof(buffer), &tempres);
299	#else
300	struct passwd * tempres = sh_getpwnam(DEFAULT_IDENT);
301	#endif
302
303	if (!tempres)
304	{
305	dlog(1, FIL__, __LINE__,
306	_("User %s does not exist. Please add the user to your system.\n"),
307	DEFAULT_IDENT);
308	status_stat = -1;
309	}
310	if (!tempres->pw_dir \|\| tempres->pw_dir[0] == '\0')
311	{
312	dlog(1, FIL__, __LINE__,
313	_("User %s does not have a home directory.\nPlease add the home directory for this user to your system.\n"),
314	DEFAULT_IDENT);
315	status_stat = -2;
316	}
317	if (status_stat == 0)
318	{
319	sl_strlcpy (cc4, tempres->pw_dir, SH_PATHBUF+32);
320	sl_strlcat (cc4, _("/.gnupg"), SH_PATHBUF+32);
321	status_stat = retry_lstat(FIL__, __LINE__, cc4, &lbuf);
322	if (status_stat == -1)
323	{
324	dlog(1, FIL__, __LINE__,
325	_("Gnupg directory %s for user %s\ndoes not exist or is not accessible.\nPlease add the directory and put the keyring (pubring.gpg) there\nto verify the configuration file.\n"),
326	cc4, DEFAULT_IDENT);
327	status_stat = -3;
328	}
329	}
330	if (status_stat == 0 && lbuf.st_uid != tempres->pw_uid)
331	{
332	dlog(1, FIL__, __LINE__,
333	_("Gnupg directory %s\nis not owned by user %s.\n"),
334	cc4, DEFAULT_IDENT);
335	status_stat = -4;
336	}
337	if (status_stat == 0)
338	{
339	sl_strlcat (cc4, _("/pubring.gpg"), SH_PATHBUF+32);
340	status_stat = retry_lstat(FIL__, __LINE__, cc4, &lbuf);
341	if (status_stat == -1)
342	{
343	dlog(1, FIL__, __LINE__,
344	_("Gnupg public keyring %s for user %s\ndoes not exist or is not accessible.\nPlease add the directory and put the keyring (pubring.gpg) there\nto verify the configuration file.\n"),
345	cc4, DEFAULT_IDENT);
346	status_stat = -5;
347	}
348	}
349	if (status_stat == 0 && lbuf.st_uid != tempres->pw_uid)
350	{
351	dlog(1, FIL__, __LINE__,
352	_("Gnupg public keyring %s\nis not owned by user %s.\n"),
353	cc4, DEFAULT_IDENT);
354	status_stat = -6;
355	}
356	if (status_stat != 0)
357	{
358	sh_error_handle((-1), FIL__, __LINE__, status_stat, MSG_EXIT_ABORT1,
359	sh.prg_name);
360	aud_exit (FIL__, __LINE__, EXIT_FAILURE);
361	}
362	sl_strlcpy (cc4, tempres->pw_dir, SH_PATHBUF+32);
363	sl_strlcat (cc4, _("/.gnupg"), SH_PATHBUF+32);
364	}
365	#endif
366
367	arg[0] = path;
368	arg[1] = cc1;
369	arg[2] = "1";
370	arg[3] = cc2;
371	arg[4] = cc3;
372	arg[5] = cc4;
373	arg[6] = cc5;
374	arg[7] = cc0;
375	arg[8] = NULL;
376
377	/* catch 'unused parameter' compiler warning
378	*/
379	(void) mode;
380	(void) id;
381	#elif defined(WITH_PGP)
382	/* -- PGP -- */
383	sl_strlcpy (path, DEFAULT_PGP_PATH, 256);
384	if (mode == 0)
385	{
386	sl_strlcpy (cc1, _("+language=en"), 32);
387	sl_strlcpy (cc2, _("-o"), 32);
388	sl_strlcpy (cc3, _("/dev/null"), 32);
389
390	arg[0] = path;
391	arg[1] = cc1;
392	arg[2] = cc2;
393	arg[3] = cc3;
394	arg[4] = cc0;
395	arg[5] = NULL;
396	}
397	else
398	{
399	sl_strlcpy (cc1, _("+language=en"), 32);
400	sl_strlcpy (cc2, _("-kvc"), 32);
401
402	arg[0] = path;
403	arg[1] = cc1;
404	arg[2] = cc2;
405	arg[3] = id;
406	arg[4] = NULL;
407	arg[5] = NULL;
408	}
409	#endif
410
411	/* use homedir of effective user
412	*/
413	if (sh.effective.home != NULL)
414	{
415	len = sl_strlen(sh.effective.home) + 6;
416	envp[0] = malloc (len); /* free() ok */
417	if (envp[0] != NULL)
418	sl_snprintf (envp[0], len, "HOME=%s", sh.effective.home);
419	envp[1] = NULL;
420	}
421	else
422	{
423	envp[0] = NULL;
424	}
425
426	/* Create the pipe
427	*/
428	if (aud_pipe(FIL__, __LINE__, pipedes) < 0)
429	{
430	if (envp[0] != NULL)
431	free(envp[0]);
432	SL_RETURN( (NULL), _("sh_gpg_popen"));
433	}
434
435	fflush (NULL);
436
437	source->pid = aud_fork(FIL__, __LINE__);
438
439	/* Failure
440	*/
441	if (source->pid == (pid_t) - 1)
442	{
443	close(pipedes[0]);
444	close(pipedes[1]);
445	if (envp[0] != NULL)
446	free(envp[0]);
447	SL_RETURN( (NULL), _("sh_gpg_popen"));
448	}
449
450	if (source->pid == (pid_t) 0)
451	{
452
453	/* child - make read side of the pipe stdout
454	*/
455	if (retry_aud_dup2(FIL__, __LINE__,
456	pipedes[STDOUT_FILENO], STDOUT_FILENO) < 0)
457	{
458	TPT(((0), FIL__, __LINE__, _("msg=<dup2 on pipe failed>\n")));
459	dlog(1, FIL__, __LINE__, _("Internal error: dup2 failed\n"));
460	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
461	}
462
463	/* close the pipe descriptors
464	*/
465	close (pipedes[STDIN_FILENO]);
466	close (pipedes[STDOUT_FILENO]);
467
468
469	#if defined(WITH_PGP)
470	if (mode == 0)
471	{
472	if (retry_aud_dup2(FIL__, __LINE__, fd, STDIN_FILENO) < 0)
473	{
474	TPT(((0), FIL__, __LINE__, _("msg=<dup2 on fd failed>\n")));
475	dlog(1, FIL__, __LINE__, _("Internal error: dup2 failed\n"));
476	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
477	}
478	}
479	#else
480	if (retry_aud_dup2(FIL__, __LINE__, fd, STDIN_FILENO) < 0)
481	{
482	TPT(((0), FIL__, __LINE__, _("msg=<dup2 on fd failed>\n")));
483	dlog(1, FIL__, __LINE__, _("Internal error: dup2 failed\n"));
484	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
485	}
486	#endif
487
488	/* don't leak file descriptors
489	*/
490	sh_unix_closeall (3, -1, SL_TRUE); /* in child process */
491
492	if (flag_err_debug != SL_TRUE)
493	{
494	if (NULL == freopen(_("/dev/null"), "r+", stderr))
495	{
496	dlog(1, FIL__, __LINE__, _("Internal error: freopen failed\n"));
497	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
498	}
499	}
500
501
502	/* We should become privileged if SUID,
503	* to be able to read the keyring.
504	* We have checked that gpg is OK,
505	* AND that only a trusted user could overwrite
506	* gpg.
507	*/
508	memset (skey, '\0', sizeof(sh_key_t));
509	aud_setuid(FIL__, __LINE__, geteuid());
510
511	PDBGC_OPEN;
512	PDBGC_D((int)getuid());
513	PDBGC_D((int)geteuid());
514
515	{
516	int i = 0;
517	while (arg[i] != NULL)
518	{
519	PDBGC_S(arg[i]);
520	++i;
521	}
522	}
523	PDBGC_CLOSE;
524
525	/* exec the program */
526
527	#if defined(__linux__) && defined(HAVE_GPG_CHECKSUM)
528	/*
529	* -- emulate an fexecve with checksum testing
530	*/
531	#if defined(WITH_PGP)
532	checkfd = sl_open_read(DEFAULT_PGP_PATH, SL_NOPRIV);
533	#else
534	checkfd = sl_open_read(DEFAULT_GPG_PATH, SL_NOPRIV);
535	#endif
536
537	if (0 != sh_gpg_checksum(checkfd, 0))
538	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
539
540	pfd = get_the_fd(checkfd);
541	sl_snprintf(pname, sizeof(pname), _("/proc/self/fd/%d"), pfd);
542	if (0 == access(pname, R_OK\|X_OK)) /* flawfinder: ignore */
543
544	{
545	fcntl (pfd, F_SETFD, FD_CLOEXEC);
546	retry_aud_execve (FIL__, __LINE__, pname, arg, envp);
547
548	dlog(1, FIL__, __LINE__, _("Unexpected error: execve %s failed\n"),
549	pname);
550	/* failed
551	*/
552	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
553	}
554
555	/* procfs not working, go ahead
556	*/
557	sl_close(checkfd);
558	#endif
559
560	#if defined(HAVE_GPG_CHECKSUM)
561	/* This is an incredibly ugly kludge to prevent an attacker
562	* from knowing when it is safe to slip in a fake executable
563	* between the integrity check and the execve
564	*/
565	myrand = (int) taus_get ();
566
567	myrand = (myrand < 0) ? (-myrand) : myrand;
568	myrand = (myrand % 32) + 2;
569
570	for (i = 0; i < myrand; ++i)
571	{
572	#if defined(WITH_PGP)
573	checkfd = sl_open_fastread(DEFAULT_PGP_PATH, SL_NOPRIV);
574	#else
575	checkfd = sl_open_fastread(DEFAULT_GPG_PATH, SL_NOPRIV);
576	#endif
577	if (0 != sh_gpg_checksum(checkfd, 0)) {
578	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
579	}
580	sl_close(checkfd);
581	}
582	#endif
583
584
585	#if defined(WITH_GPG)
586	retry_aud_execve (FIL__, __LINE__, DEFAULT_GPG_PATH, arg, envp);
587	dlog(1, FIL__, __LINE__, _("Unexpected error: execve %s failed\n"),
588	DEFAULT_GPG_PATH);
589	#elif defined(WITH_PGP)
590	retry_aud_execve (FIL__, __LINE__, DEFAULT_PGP_PATH, arg, envp);
591	#endif
592
593	/* failed
594	*/
595	TPT(((0), FIL__, __LINE__, _("msg=<execve failed>\n")));
596	dlog(1, FIL__, __LINE__, _("Unexpected error: execve failed\n"));
597	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
598	}
599
600	/* parent
601	*/
602
603	if (envp[0] != NULL)
604	free(envp[0]);
605
606	close (pipedes[STDOUT_FILENO]);
607	retry_fcntl (FIL__, __LINE__, pipedes[STDIN_FILENO], F_SETFD, FD_CLOEXEC);
608	retry_fcntl (FIL__, __LINE__, pipedes[STDIN_FILENO], F_SETFL, O_NONBLOCK);
609
610	outf = fdopen (pipedes[STDIN_FILENO], "r");
611
612	if (outf == NULL)
613	{
614	aud_kill (FIL__, __LINE__, source->pid, SIGKILL);
615	close (pipedes[STDOUT_FILENO]);
616	waitpid (source->pid, NULL, 0);
617	source->pid = 0;
618	SL_RETURN( (NULL), _("sh_gpg_popen"));
619	}
620
621	SL_RETURN( (outf), _("sh_gpg_popen"));
622	}
623
624
625	static int sh_gpg_pclose (sh_gpg_popen_t *source)
626	{
627	int status = 0;
628
629	SL_ENTER(_("sh_gpg_pclose"));
630
631	status = fclose(source->pipe);
632	if (status)
633	SL_RETURN( (-1), _("sh_gpg_pclose"));
634
635	if (waitpid(source->pid, NULL, 0) != source->pid)
636	status = -1;
637
638	source->pipe = NULL;
639	source->pid = 0;
640	SL_RETURN( (status), _("sh_gpg_pclose"));
641	}
642
643	static
644	int sh_gpg_check_file_sign(int fd, char * sign_id, char * sign_fp,
645	char * homedir, int whichfile)
646	{
647	struct stat buf;
648	char line[256];
649	sh_gpg_popen_t source;
650	int have_id = BAD, have_fp = BAD, status = 0;
651	#ifdef WITH_PGP
652	char *ptr;
653	#endif
654
655	#ifdef HAVE_GPG_CHECKSUM
656	SL_TICKET checkfd;
657	#endif
658
659	SL_ENTER(_("sh_gpg_check_file_sign"));
660
661	/* check whether GnuPG exists and has the correct checksum
662	*/
663	#if defined(WITH_GPG)
664
665	TPT(((0), FIL__, __LINE__, _("msg=<Check signature>\n")));
666	TPT(((0), FIL__, __LINE__, _("msg=<gpg is %s>\n"), DEFAULT_GPG_PATH));
667
668	if (0 != retry_lstat(FIL__, __LINE__, DEFAULT_GPG_PATH, &buf))
669	{
670	char errbuf[SH_ERRBUF_SIZE];
671
672	status = errno;
673	sh_error_handle(SH_ERR_ERR, FIL__, __LINE__, status, MSG_ERR_LSTAT,
674	sh_error_message(status, errbuf, sizeof(errbuf)), DEFAULT_GPG_PATH);
675	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
676	}
677
678	if (0 != tf_trust_check (DEFAULT_GPG_PATH, SL_YESPRIV))
679	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
680
681	#ifdef HAVE_GPG_CHECKSUM
682	checkfd = sl_open_read(DEFAULT_GPG_PATH, SL_YESPRIV);
683
684	if (0 != sh_gpg_checksum(checkfd, 1))
685	{
686	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
687	_("Checksum mismatch"),
688	_("gpg_check_file_sign"));
689	sl_close(checkfd);
690	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
691	}
692	sl_close(checkfd);
693	#endif
694
695	#elif defined(WITH_PGP)
696
697	TPT(((0), FIL__, __LINE__, _("msg=<Check signature>\n")));
698	TPT(((0), FIL__, __LINE__, _("msg=<pgp is %s>\n"), DEFAULT_PGP_PATH));
699
700	if (0 != retry_lstat(FIL__, __LINE__, DEFAULT_PGP_PATH, &buf))
701	{
702	char errbuf[SH_ERRBUF_SIZE];
703
704	status = errno;
705	sh_error_handle(SH_ERR_ERR, FIL__, __LINE__, status, MSG_ERR_LSTAT,
706	sh_error_message(status, errbuf, sizeof(errbuf)), DEFAULT_PGP_PATH);
707	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
708	}
709	if (0 != tf_trust_check (DEFAULT_PGP_PATH, SL_YESPRIV))
710	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
711
712	#ifdef HAVE_GPG_CHECKSUM
713	checkfd = sl_open_read(DEFAULT_PGP_PATH, SL_YESPRIV);
714
715	if (0 != sh_gpg_checksum(checkfd, 1))
716	{
717	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
718	_("Checksum mismatch"),
719	_("gpg_check_file_sign"));
720	sl_close(checkfd);
721	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
722	}
723	sl_close(checkfd);
724	#endif
725
726	#endif
727
728	TPT(((0), FIL__, __LINE__, _("msg=<Open pipe to check signature>\n")));
729
730	fflush(NULL);
731
732	source.pipe = sh_gpg_popen ( &source, fd, 0, NULL, homedir );
733
734	if (NULL == source.pipe)
735	{
736	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
737	_("Could not open pipe"),
738	_("gpg_check_file_sign"));
739	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
740	}
741
742	TPT(((0), FIL__, __LINE__, _("msg=<Open pipe success>\n")));
743
744	xagain:
745
746	errno = 0;
747
748	while (NULL != fgets(line, sizeof(line), source.pipe))
749	{
750
751	TPT(((0), FIL__, __LINE__, _("msg=<gpg out: %s>\n"), line));
752	if (line[strlen(line)-1] == '\n')
753	line[strlen(line)-1] = ' ';
754	sh_error_handle(SH_ERR_ALL, FIL__, __LINE__, 0, MSG_E_SUBGEN,
755	line,
756	_("gpg_check_file_sign"));
757
758	if (sl_strlen(line) < 18)
759	continue;
760	#if defined(WITH_GPG)
761	/* Sun May 27 18:40:05 CEST 2001
762	*/
763	if (0 == sl_strncmp(_("BADSIG"), &line[9], 6) \|\|
764	0 == sl_strncmp(_("ERRSIG"), &line[9], 6) \|\|
765	0 == sl_strncmp(_("NO_PUBKEY"), &line[9], 6) \|\|
766	0 == sl_strncmp(_("NODATA"), &line[9], 6) \|\|
767	0 == sl_strncmp(_("SIGEXPIRED"), &line[9], 6))
768	{
769	if (0 == sl_strncmp(_("BADSIG"), &line[9], 6)) {
770	dlog(1, FIL__, __LINE__,
771	_("%s file is signed, but the signature is invalid."),
772	((whichfile == 1) ? _("Configuration") : _("Database")));
773	}
774	else if (0 == sl_strncmp(_("NO_PUBKEY"), &line[9], 6)) {
775	dlog(1, FIL__, __LINE__,
776	_("%s file is signed, but the public key to verify the signature is not in my keyring %s/.gnupg/pubring.asc."),
777	((whichfile == 1) ? _("Configuration") : _("Database")),
778	homedir);
779	}
780	else if (0 == sl_strncmp(_("ERRSIG"), &line[9], 6)) {
781	dlog(1, FIL__, __LINE__,
782	_("%s file is signed, but the public key to verify the signature is not in my keyring %s/.gnupg/pubring.asc."),
783	((whichfile == 1) ? _("Configuration") : _("Database")),
784	homedir);
785	}
786	else if (0 == sl_strncmp(_("SIGEXPIRED"), &line[9], 6)) {
787	dlog(1, FIL__, __LINE__,
788	_("%s file is signed, but the public key to verify the signature has expired."),
789	((whichfile == 1) ? _("Configuration") : _("Database")));
790	}
791	else if (0 == sl_strncmp(_("NODATA"), &line[9], 6)) {
792	dlog(1, FIL__, __LINE__,
793	_("%s file is not signed."),
794	((whichfile == 1) ? _("Configuration") : _("Database")));
795	}
796
797	have_fp = BAD; have_id = BAD;
798	break;
799	}
800	if (0 == sl_strncmp(_("GOODSIG"), &line[9], 7))
801	{
802	sl_strlcpy (sign_id, &line[25], SH_MINIBUF+1);
803	sign_id[sl_strlen(sign_id)-1] = '\0'; /* remove trailing '"' */
804	have_id = GOOD;
805	}
806	if (0 == sl_strncmp(_("VALIDSIG"), &line[9], 8))
807	{
808	strncpy (sign_fp, &line[18], 40);
809	sign_fp[40] = '\0';
810	have_fp = GOOD;
811	}
812	#elif defined(WITH_PGP)
813	if (0 == sl_strncmp(_("Bad signature"), line, 13) \|\|
814	0 == sl_strncmp(_("Error"), line, 5) \|\|
815	0 == sl_strncmp(_("Malformed"), line, 9) \|\|
816	0 == sl_strncmp(_("WARNING"), line, 7) \|\|
817	0 == sl_strncmp(_("ERROR"), line, 5)
818	)
819	{
820	have_fp = BAD; have_id = BAD;
821	break;
822	}
823	if (0 == sl_strncmp(_("Good signature"), line, 14))
824	{
825	ptr = strchr ( line, '"');
826	++ptr;
827	sl_strlcpy (sign_id, ptr, SH_MINIBUF+1);
828	sign_id[sl_strlen(sign_id)-1] = '\0'; /* remove trailing dot */
829	sign_id[sl_strlen(sign_id)-2] = '\0'; /* remove trailing '"' */
830	have_id = GOOD;
831	}
832	#endif
833	}
834
835	if (ferror(source.pipe) && errno == EAGAIN)
836	{
837	clearerr(source.pipe);
838	goto xagain;
839	}
840
841	sh_gpg_pclose (&source);
842
843	TPT(((0), FIL__, __LINE__, _("msg=<Close pipe>\n")));
844
845	#ifdef WITH_PGP
846	/* get the fingerprint */
847
848	source.pipe = sh_gpg_popen ( &source, fd, 1, sign_id, homedir);
849	if (NULL == source.pipe)
850	{
851	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
852	_("Could not open pipe for fp"),
853	_("gpg_check_file_sign"));
854	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
855	}
856
857	TPT(((0), FIL__, __LINE__, _("msg=<Open pipe success>\n")));
858
859	yagain:
860
861	errno = 0;
862
863	while (NULL != fgets(line, sizeof(line), source.pipe))
864	{
865	#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_STRTOK_R)
866	char * saveptr = NULL;
867	#endif
868	if (line[strlen(line)-1] == '\n')
869	line[strlen(line)-1] = ' ';
870	sh_error_handle(SH_ERR_ALL, FIL__, __LINE__, 0, MSG_E_SUBGEN,
871	line,
872	_("gpg_check_file_sign"));
873
874	if (sl_strlen(line) < 18)
875	continue;
876	#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_STRTOK_R)
877	ptr = strtok_r (line, " ", &saveptr);
878	#else
879	ptr = strtok (line, " ");
880	#endif
881	while (ptr)
882	{
883	#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_STRTOK_R)
884	ptr = strtok_r (NULL, " ", &saveptr);
885	#else
886	ptr = strtok (NULL, " ");
887	#endif
888	if (ptr && 0 == sl_strncmp (ptr, _("fingerprint"), 11))
889	{
890	#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_STRTOK_R)
891	ptr = strtok_r (NULL, " ", &saveptr); /* to '=' */
892	#else
893	ptr = strtok (NULL, " "); /* to '=' */
894	#endif
895	sign_fp[0] = '\0';
896	while (ptr)
897	{
898	#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_STRTOK_R)
899	ptr = strtok_r (NULL, " ", &saveptr); /* part of fingerprint */
900	#else
901	ptr = strtok (NULL, " "); /* part of fingerprint */
902	#endif
903	sl_strlcat (sign_fp, ptr, SH_MINIBUF+1);
904	}
905	/* sign_fp[sl_strlen(sign_fp)-1] = '\0'; remove trailing '\n' */
906	if (sl_strlen(sign_fp) > 0)
907	have_fp = GOOD;
908	break;
909	}
910	}
911	}
912
913	if (ferror(source.pipe) && errno == EAGAIN)
914	{
915	clearerr(source.pipe);
916	goto yagain;
917	}
918
919	sh_gpg_pclose (&source);
920	#endif
921
922	if (have_id == GOOD)
923	{
924	TPT(((0), FIL__, __LINE__, _("msg=<Got signator ID>\n")));
925	;
926	}
927	if (have_fp == GOOD)
928	{
929	TPT(((0), FIL__, __LINE__, _("msg=<Got fingerprint>\n")));
930	;
931	}
932
933	if (have_id == GOOD && have_fp == GOOD)
934	SL_RETURN( SH_GPG_OK, _("sh_gpg_check_file_sign"));
935	else
936	{
937	if (have_id == BAD)
938	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
939	_("No good signature"),
940	_("gpg_check_file_sign"));
941	else
942	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
943	_("No fingerprint for key"),
944	_("gpg_check_file_sign"));
945	SL_RETURN( SH_GPG_BADSIGN, _("sh_gpg_check_file_sign"));
946	}
947	}
948
949	int get_the_fd(SL_TICKET file_1);
950
951	int sh_gpg_check_sign (long file_1, long file_2, int what)
952	{
953	int status = SH_GPG_BAD;
954	int fd1 = 0;
955	int fd2 = 0;
956	static int smsg = S_FALSE;
957	char * tmp;
958	char * tmp2;
959
960	char * homedir = sh.effective.home;
961	#if defined(SH_WITH_SERVER)
962	struct passwd * tempres;
963	#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_GETPWNAM_R)
964	struct passwd pwd;
965	char buffer[SH_PWBUF_SIZE];
966	#endif
967	#endif
968
969	#ifdef USE_FINGERPRINT
970	#include "sh_gpg_fp.h"
971	#endif
972
973	SL_ENTER(_("sh_gpg_check_sign"));
974
975
976	if (what == 0 \|\| what == 1)
977	fd1 = get_the_fd(file_1);
978	if (what == 0 \|\| what == 2)
979	fd2 = get_the_fd(file_2);
980
981
982	if (fd1 < 0 \|\| fd2 < 0)
983	{
984	TPT(((0), FIL__, __LINE__, _("msg=<GPG_CHECK: FD1 = %d>\n"), fd1));
985	TPT(((0), FIL__, __LINE__, _("msg=<GPG_CHECK: FD2 = %d>\n"), fd2));
986	dlog(1, FIL__, __LINE__,
987	_("This looks like an unexpected internal error.\n"));
988	sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_EXIT_ABORT1, sh.prg_name);
989	aud_exit (FIL__, __LINE__, EXIT_FAILURE);
990	SL_RETURN( (-1), _("sh_gpg_check_sign"));
991	}
992
993	if (what == 0 \|\| what == 1)
994	{
995	TPT(((0), FIL__, __LINE__, _("msg=<GPG_CHECK: FD1 = %d>\n"), fd1));
996	#if defined(SH_WITH_SERVER)
997	#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_GETPWNAM_R)
998	sh_getpwnam_r(DEFAULT_IDENT, &pwd, buffer, sizeof(buffer), &tempres);
999	#else
1000	tempres = sh_getpwnam(DEFAULT_IDENT);
1001	#endif
1002
1003	if ((tempres != NULL) && (0 == sl_ret_euid()))
1004	{
1005	/* privileges not dropped yet*/
1006	homedir = tempres->pw_dir;
1007	}
1008	#endif
1009	status = sh_gpg_check_file_sign(fd1, gp.conf_id, gp.conf_fp, homedir, 1);
1010	TPT(((0), FIL__, __LINE__, _("msg=<CONF SIGUSR: \|%s\|>\n"), gp.conf_id));
1011	TPT(((0), FIL__, __LINE__, _("msg=<CONF SIGFP: \|%s\|>\n"), gp.conf_fp));
1012	}
1013
1014	if ((what == 0 && SH_GPG_OK == status) \|\| what == 2)
1015	{
1016	TPT(((0), FIL__, __LINE__, _("msg=<GPG_CHECK: FD2 = %d>\n"), fd2));
1017	#if defined(SH_WITH_SERVER)
1018	#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_GETPWNAM_R)
1019	sh_getpwnam_r(DEFAULT_IDENT, &pwd, buffer, sizeof(buffer), &tempres);
1020	#else
1021	tempres = sh_getpwnam(DEFAULT_IDENT);
1022	#endif
1023
1024	if ((tempres != NULL) && (0 == sl_ret_euid()))
1025	{
1026	/* privileges not dropped yet*/
1027	homedir = tempres->pw_dir;
1028	}
1029	#endif
1030	status = sh_gpg_check_file_sign(fd2, gp.data_id, gp.data_fp, homedir, 2);
1031	TPT(((0), FIL__, __LINE__, _("msg=<DATA SIGUSR: \|%s\|>\n"), gp.data_id));
1032	TPT(((0), FIL__, __LINE__, _("msg=<DATA SIGFP: \|%s\|>\n"), gp.data_fp));
1033	}
1034
1035	if (SH_GPG_OK == status && what == 1)
1036	{
1037	#ifdef USE_FINGERPRINT
1038	if ((sl_strcmp(SH_GPG_FP, gp.conf_fp) == 0))
1039	{
1040	int i;
1041
1042	for(i = 0; i < (int) sl_strlen(gp.conf_fp); ++i)
1043	{
1044	if (gpgfp[i] != gp.conf_fp[i])
1045	{
1046	sh_error_handle(SH_ERR_SEVERE, FIL__, __LINE__, 0,
1047	MSG_E_GPG_FP,
1048	gpgfp, gp.conf_fp);
1049	break;
1050	}
1051	}
1052
1053	if (smsg == S_FALSE)
1054	{
1055	tmp = sh_util_safe_name(gp.conf_id);
1056	sh_gpg_fill_startup (__LINE__,
1057	/* sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_START_GH, */
1058	sh.prg_name, sh.real.uid,
1059	(sh.flag.hidefile == S_TRUE) ?
1060	_("(hidden)") : file_path('C', 'R'),
1061	tmp,
1062	gp.conf_fp);
1063	SH_FREE(tmp);
1064	}
1065	smsg = S_TRUE;
1066	SL_RETURN(0, _("sh_gpg_check_sign"));
1067	}
1068	else
1069	{
1070	/* fp mismatch
1071	*/
1072	dlog(1, FIL__, __LINE__,
1073	_("The fingerprint of the signing key: %s\ndoes not match the compiled-in fingerprint: %s.\nTherefore the signature could not be verified.\n"),
1074	gp.conf_fp, SH_GPG_FP);
1075	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
1076	_("Fingerprint mismatch"),
1077	_("gpg_check_sign"));
1078	status = SH_GPG_BADSIGN;
1079	}
1080	#else
1081	if (smsg == S_FALSE)
1082	{
1083	tmp = sh_util_safe_name(gp.conf_id);
1084	sh_gpg_fill_startup (__LINE__,
1085	/* sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_START_GH, */
1086	sh.prg_name, sh.real.uid,
1087	(sh.flag.hidefile == S_TRUE) ?
1088	_("(hidden)") : file_path('C', 'R'),
1089	tmp,
1090	gp.conf_fp);
1091	SH_FREE(tmp);
1092	}
1093	smsg = S_TRUE;
1094	SL_RETURN(0, _("sh_gpg_check_sign"));
1095	#endif
1096	}
1097
1098	else if (SH_GPG_OK == status && (what == 2 \|\| what == 0))
1099	{
1100	if ((sl_strcmp(gp.data_id, gp.conf_id) == 0) &&
1101	(sl_strcmp(gp.data_fp, gp.conf_fp) == 0))
1102	{
1103	SL_RETURN(0, _("sh_gpg_check_sign"));
1104	}
1105	else
1106	{
1107	/* ID or fp not equal
1108	*/
1109	dlog(1, FIL__, __LINE__,
1110	_("The fingerprint or ID of the signing key is not the same for the\nconfiguration file and the file signature database.\nTherefore the signature could not be verified.\n"));
1111	tmp = sh_util_safe_name (gp.conf_id);
1112	tmp2 = sh_util_safe_name (gp.data_id);
1113	sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_START_GH2,
1114	sh.prg_name, sh.real.uid,
1115	(sh.flag.hidefile == S_TRUE) ? _("(hidden)") : file_path('C', 'R'),
1116	tmp, gp.conf_fp,
1117	(sh.flag.hidefile == S_TRUE) ? _("(hidden)") : file_path('D', 'R'),
1118	tmp2, gp.data_fp);
1119	SH_FREE(tmp);
1120	SH_FREE(tmp2);
1121	}
1122	}
1123
1124	if (status != SH_GPG_OK)
1125	{
1126	uid_t e_uid = sl_ret_euid();
1127	char * e_home = sh.effective.home;
1128
1129	#if defined(SH_WITH_SERVER)
1130	#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_GETPWNAM_R)
1131	struct passwd e_pwd;
1132	char e_buffer[SH_PWBUF_SIZE];
1133	struct passwd * e_tempres;
1134	sh_getpwnam_r(DEFAULT_IDENT, &e_pwd, e_buffer, sizeof(e_buffer), &e_tempres);
1135	#else
1136	struct passwd * e_tempres = sh_getpwnam(DEFAULT_IDENT);
1137	#endif
1138
1139	if ((e_tempres != NULL) && (0 == sl_ret_euid()))
1140	{
1141	/* privileges not dropped yet */
1142	e_uid = e_tempres->pw_uid;
1143	e_home = e_tempres->pw_dir;
1144	}
1145	#endif
1146	dlog(1, FIL__, __LINE__,
1147	_("The signature of the configuration file or the file signature database\ncould not be verified. Possible reasons are:\n - gpg binary (%s) not found\n - invalid signature\n - the signature key is not in the private keyring of UID %d,\n - there is no keyring in %s/.gnupg, or\n - the file is not signed - did you move /filename.asc to /filename ?\nTo create a signed file, use (remove old signatures before):\n gpg -a --clearsign --not-dash-escaped FILE\n mv FILE.asc FILE\n"),
1148	#if defined(WITH_GPG)
1149	DEFAULT_GPG_PATH,
1150	#else
1151	DEFAULT_PGP_PATH,
1152	#endif
1153	(int) e_uid, e_home);
1154	}
1155
1156	TPT(((0), FIL__, __LINE__, _("msg=<Status = %d>\n"), status));
1157
1158	sh_error_handle((-1), FIL__, __LINE__, status, MSG_EXIT_ABORT1, sh.prg_name);
1159	aud_exit (FIL__, __LINE__, EXIT_FAILURE);
1160
1161	return (-1); /* make compiler happy */
1162	}
1163
1164	/* #ifdef WITH_GPG */
1165	#endif
1166
1167
1168
1169
1170
1171
1172
1173

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