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source: trunk/src/sh_gpg.c@ 94

Last change on this file since 94 was 87, checked in by rainer, 18 years ago
Fixed compile failure if --with-fp is used.
File size: 29.9 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	tiger_fd = checkfd;
131	#if defined(WITH_PGP)
132	test_gpg = sh_tiger_hash_gpg (DEFAULT_PGP_PATH, TIGER_FD, 0);
133	#else
134	test_gpg = sh_tiger_hash_gpg (DEFAULT_GPG_PATH, TIGER_FD, 0);
135	#endif
136
137	test_ptr1 = strchr(GPG_HASH, ':');
138	if (test_gpg != NULL)
139	test_ptr2 = strchr(test_gpg, ':');
140
141	if (test_ptr2 != NULL)
142	test_ptr2 += 2;
143	else
144	test_ptr2 = test_gpg;
145	if (test_ptr1 != NULL)
146	test_ptr1 += 2;
147	else
148	test_ptr1 = GPG_HASH;
149
150	/* Tue Jun 24 23:11:54 CEST 2003 (1.7.9) -- strip whitespace
151	*/
152	k = 0;
153	for (i = 0; i < 127; ++i)
154	{
155	if (test_ptr1[i] == '\0')
156	break;
157	if (test_ptr1[i] != ' ')
158	{
159	wstrip1[k] = test_ptr1[i];
160	++k;
161	}
162	}
163	wstrip1[k] = '\0';
164
165	for(i = 0; i < KEY_LEN; ++i)
166	{
167	if (gpgchk[i] != wstrip1[i])
168	{
169	sh_error_handle(SH_ERR_SEVERE, FIL__, __LINE__, 0, MSG_E_GPG_CHK,
170	gpgchk, wstrip1);
171	break;
172	}
173	}
174
175	k = 0;
176	for (i = 0; i < 127; ++i)
177	{
178	if (test_ptr2[i] == '\0')
179	break;
180	if (test_ptr2[i] != ' ')
181	{
182	wstrip2[k] = test_ptr2[i];
183	++k;
184	}
185	}
186	wstrip2[k] = '\0';
187
188	if (0 != sl_strncmp(wstrip1, wstrip2, 127))
189	{
190	TPT(((0), FIL__, __LINE__, _("msg=<pgp checksum: %s>\n"), test_gpg));
191	TPT(((0), FIL__, __LINE__, _("msg=<Compiled-in : %s>\n"), GPG_HASH));
192	TPT(((0), FIL__, __LINE__, _("msg=<wstrip1 : %s>\n"), wstrip1));
193	TPT(((0), FIL__, __LINE__, _("msg=<wstrip2 : %s>\n"), wstrip2));
194	if (flag == 1)
195	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_GPG,
196	GPG_HASH, test_gpg);
197	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);
198	SH_FREE(test_gpg);
199	SL_RETURN((-1), _("sh_gpg_checksum"));
200	}
201	SH_FREE(test_gpg);
202	SL_RETURN( (0), _("sh_gpg_checksum"));
203	}
204	#endif
205
206	struct startup_info {
207	long line;
208	char * program;
209	long uid;
210	char * path;
211	char * key_uid;
212	char * key_id;
213	};
214
215	static struct startup_info startInfo = { 0, NULL, 0, NULL, NULL, NULL };
216
217	void sh_gpg_log_startup ()
218	{
219	if (startInfo.program != NULL)
220	{
221	sh_error_handle ((-1), FIL__, startInfo.line, 0, MSG_START_GH,
222	startInfo.program, startInfo.uid,
223	startInfo.path,
224	startInfo.key_uid, startInfo.key_id);
225	}
226	return;
227	}
228
229	static void sh_gpg_fill_startup (long line, char * program, long uid, char * path,
230	char * key_uid, char * key_id)
231	{
232	startInfo.line = line;
233	startInfo.program = sh_util_strdup(program);
234	startInfo.uid = uid;
235	startInfo.path = sh_util_strdup(path);
236	startInfo.key_uid = sh_util_strdup(key_uid);
237	startInfo.key_id = sh_util_strdup(key_id);
238	return;
239	}
240
241	static FILE * sh_gpg_popen (sh_gpg_popen_t *source, int fd,
242	int mode, char * id, char * homedir)
243	{
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	struct passwd * tempres = getpwnam(DEFAULT_IDENT);
295	if (!tempres)
296	tempres = sh_getpwnam(DEFAULT_IDENT);
297	if (!tempres)
298	{
299	dlog(1, FIL__, __LINE__,
300	_("User %s does not exist. Please add the user to your system.\n"),
301	DEFAULT_IDENT);
302	status_stat = -1;
303	}
304	if (!tempres->pw_dir \|\| tempres->pw_dir[0] == '\0')
305	{
306	dlog(1, FIL__, __LINE__,
307	_("User %s does not have a home directory.\nPlease add the home directory for this user to your system.\n"),
308	DEFAULT_IDENT);
309	status_stat = -2;
310	}
311	if (status_stat == 0)
312	{
313	sl_strlcpy (cc4, tempres->pw_dir, SH_PATHBUF+32);
314	sl_strlcat (cc4, _("/.gnupg"), SH_PATHBUF+32);
315	status_stat = retry_lstat(FIL__, __LINE__, cc4, &lbuf);
316	if (status_stat == -1)
317	{
318	dlog(1, FIL__, __LINE__,
319	_("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"),
320	cc4, DEFAULT_IDENT);
321	status_stat = -3;
322	}
323	}
324	if (status_stat == 0 && lbuf.st_uid != tempres->pw_uid)
325	{
326	dlog(1, FIL__, __LINE__,
327	_("Gnupg directory %s\nis not owned by user %s.\n"),
328	cc4, DEFAULT_IDENT);
329	status_stat = -4;
330	}
331	if (status_stat == 0)
332	{
333	sl_strlcat (cc4, _("/pubring.gpg"), SH_PATHBUF+32);
334	status_stat = retry_lstat(FIL__, __LINE__, cc4, &lbuf);
335	if (status_stat == -1)
336	{
337	dlog(1, FIL__, __LINE__,
338	_("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"),
339	cc4, DEFAULT_IDENT);
340	status_stat = -5;
341	}
342	}
343	if (status_stat == 0 && lbuf.st_uid != tempres->pw_uid)
344	{
345	dlog(1, FIL__, __LINE__,
346	_("Gnupg public keyring %s\nis not owned by user %s.\n"),
347	cc4, DEFAULT_IDENT);
348	status_stat = -6;
349	}
350	if (status_stat != 0)
351	{
352	sh_error_handle((-1), FIL__, __LINE__, status_stat, MSG_EXIT_ABORT1,
353	sh.prg_name);
354	aud_exit (FIL__, __LINE__, EXIT_FAILURE);
355	}
356	sl_strlcpy (cc4, tempres->pw_dir, SH_PATHBUF+32);
357	sl_strlcat (cc4, _("/.gnupg"), SH_PATHBUF+32);
358	}
359	#endif
360
361	arg[0] = path;
362	arg[1] = cc1;
363	arg[2] = "1";
364	arg[3] = cc2;
365	arg[4] = cc3;
366	arg[5] = cc4;
367	arg[6] = cc5;
368	arg[7] = cc0;
369	arg[8] = NULL;
370
371	/* catch 'unused parameter' compiler warning
372	*/
373	(void) mode;
374	(void) id;
375	#elif defined(WITH_PGP)
376	/* -- PGP -- */
377	sl_strlcpy (path, DEFAULT_PGP_PATH, 256);
378	if (mode == 0)
379	{
380	sl_strlcpy (cc1, _("+language=en"), 32);
381	sl_strlcpy (cc2, _("-o"), 32);
382	sl_strlcpy (cc3, _("/dev/null"), 32);
383
384	arg[0] = path;
385	arg[1] = cc1;
386	arg[2] = cc2;
387	arg[3] = cc3;
388	arg[4] = cc0;
389	arg[5] = NULL;
390	}
391	else
392	{
393	sl_strlcpy (cc1, _("+language=en"), 32);
394	sl_strlcpy (cc2, _("-kvc"), 32);
395
396	arg[0] = path;
397	arg[1] = cc1;
398	arg[2] = cc2;
399	arg[3] = id;
400	arg[4] = NULL;
401	arg[5] = NULL;
402	}
403	#endif
404
405	/* use homedir of effective user
406	*/
407	if (sh.effective.home != NULL)
408	{
409	len = sl_strlen(sh.effective.home) + 6;
410	envp[0] = malloc (len); /* free() ok */
411	if (envp[0] != NULL)
412	sl_snprintf (envp[0], len, "HOME=%s", sh.effective.home);
413	envp[1] = NULL;
414	}
415	else
416	{
417	envp[0] = NULL;
418	}
419
420	/* Create the pipe
421	*/
422	if (aud_pipe(FIL__, __LINE__, pipedes) < 0)
423	{
424	if (envp[0] != NULL)
425	free(envp[0]);
426	SL_RETURN( (NULL), _("sh_gpg_popen"));
427	}
428
429	source->pid = aud_fork(FIL__, __LINE__);
430
431	/* Failure
432	*/
433	if (source->pid == (pid_t) - 1)
434	{
435	close(pipedes[0]);
436	close(pipedes[1]);
437	if (envp[0] != NULL)
438	free(envp[0]);
439	SL_RETURN( (NULL), _("sh_gpg_popen"));
440	}
441
442	if (source->pid == (pid_t) 0)
443	{
444
445	/* child - make read side of the pipe stdout
446	*/
447	if (retry_aud_dup2(FIL__, __LINE__,
448	pipedes[STDOUT_FILENO], STDOUT_FILENO) < 0)
449	{
450	TPT(((0), FIL__, __LINE__, _("msg=<dup2 on pipe failed>\n")));
451	dlog(1, FIL__, __LINE__, _("Internal error: dup2 failed\n"));
452	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
453	}
454
455	/* close the pipe descriptors
456	*/
457	close (pipedes[STDIN_FILENO]);
458	close (pipedes[STDOUT_FILENO]);
459
460
461	#if defined(WITH_PGP)
462	if (mode == 0)
463	{
464	if (retry_aud_dup2(FIL__, __LINE__, fd, STDIN_FILENO) < 0)
465	{
466	TPT(((0), FIL__, __LINE__, _("msg=<dup2 on fd failed>\n")));
467	dlog(1, FIL__, __LINE__, _("Internal error: dup2 failed\n"));
468	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
469	}
470	}
471	#else
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	#endif
479
480	/* don't leak file descriptors
481	*/
482	sh_unix_closeall (3, -1); /* in child process */
483
484	freopen(_("/dev/null"), "r+", stderr);
485
486	/* We should become privileged if SUID,
487	* to be able to read the keyring.
488	* We have checked that gpg is OK,
489	* AND that only a trusted user could overwrite
490	* gpg.
491	*/
492	memset (skey, '\0', sizeof(sh_key_t));
493	aud_setuid(FIL__, __LINE__, geteuid());
494
495	PDBGC_OPEN;
496	PDBGC_D((int)getuid());
497	PDBGC_D((int)geteuid());
498
499	{
500	int i = 0;
501	while (arg[i] != NULL)
502	{
503	PDBGC_S(arg[i]);
504	++i;
505	}
506	}
507	PDBGC_CLOSE;
508
509	/* exec the program */
510
511	#if defined(__linux__) && defined(HAVE_GPG_CHECKSUM)
512	/*
513	* -- emulate an fexecve with checksum testing
514	*/
515	#if defined(WITH_PGP)
516	checkfd = sl_open_read(DEFAULT_PGP_PATH, SL_NOPRIV);
517	#else
518	checkfd = sl_open_read(DEFAULT_GPG_PATH, SL_NOPRIV);
519	#endif
520
521	if (0 != sh_gpg_checksum(checkfd, 0))
522	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
523
524	pfd = get_the_fd(checkfd);
525	sl_snprintf(pname, sizeof(pname), _("/proc/self/fd/%d"), pfd);
526	if (0 == access(pname, R_OK\|X_OK)) /* flawfinder: ignore */
527
528	{
529	fcntl (pfd, F_SETFD, FD_CLOEXEC);
530	retry_aud_execve (FIL__, __LINE__, pname, arg, envp);
531
532	dlog(1, FIL__, __LINE__, _("Unexpected error: execve %s failed\n"),
533	pname);
534	/* failed
535	*/
536	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
537	}
538
539	/* procfs not working, go ahead
540	*/
541	sl_close(checkfd);
542	#endif
543
544	#if defined(HAVE_GPG_CHECKSUM)
545	/* This is an incredibly ugly kludge to prevent an attacker
546	* from knowing when it is safe to slip in a fake executable
547	* between the integrity check and the execve
548	*/
549	myrand = (int) taus_get (&(skey->rng0[0]), &(skey->rng1[0]),
550	&(skey->rng2[0]));
551	myrand = (myrand < 0) ? (-myrand) : myrand;
552	myrand = (myrand % 32) + 2;
553
554	for (i = 0; i < myrand; ++i)
555	{
556	#if defined(WITH_PGP)
557	checkfd = sl_open_fastread(DEFAULT_PGP_PATH, SL_NOPRIV);
558	#else
559	checkfd = sl_open_fastread(DEFAULT_GPG_PATH, SL_NOPRIV);
560	#endif
561	if (0 != sh_gpg_checksum(checkfd, 0)) {
562	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
563	}
564	sl_close(checkfd);
565	}
566	#endif
567
568
569	#if defined(WITH_GPG)
570	retry_aud_execve (FIL__, __LINE__, DEFAULT_GPG_PATH, arg, envp);
571	dlog(1, FIL__, __LINE__, _("Unexpected error: execve %s failed\n"),
572	DEFAULT_GPG_PATH);
573	#elif defined(WITH_PGP)
574	retry_aud_execve (FIL__, __LINE__, DEFAULT_PGP_PATH, arg, envp);
575	#endif
576
577	/* failed
578	*/
579	TPT(((0), FIL__, __LINE__, _("msg=<execve failed>\n")));
580	dlog(1, FIL__, __LINE__, _("Unexpected error: execve failed\n"));
581	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
582	}
583
584	/* parent
585	*/
586
587	if (envp[0] != NULL)
588	free(envp[0]);
589
590	close (pipedes[STDOUT_FILENO]);
591	retry_fcntl (FIL__, __LINE__, pipedes[STDIN_FILENO], F_SETFD, FD_CLOEXEC);
592	retry_fcntl (FIL__, __LINE__, pipedes[STDIN_FILENO], F_SETFL, O_NONBLOCK);
593
594	outf = fdopen (pipedes[STDIN_FILENO], "r");
595
596	if (outf == NULL)
597	{
598	aud_kill (FIL__, __LINE__, source->pid, SIGKILL);
599	close (pipedes[STDOUT_FILENO]);
600	waitpid (source->pid, NULL, 0);
601	source->pid = 0;
602	SL_RETURN( (NULL), _("sh_gpg_popen"));
603	}
604
605	SL_RETURN( (outf), _("sh_gpg_popen"));
606	}
607
608
609	static int sh_gpg_pclose (sh_gpg_popen_t *source)
610	{
611	int status = 0;
612
613	SL_ENTER(_("sh_gpg_pclose"));
614
615	status = fclose(source->pipe);
616	if (status)
617	SL_RETURN( (-1), _("sh_gpg_pclose"));
618
619	if (waitpid(source->pid, NULL, 0) != source->pid)
620	status = -1;
621
622	source->pipe = NULL;
623	source->pid = 0;
624	SL_RETURN( (status), _("sh_gpg_pclose"));
625	}
626
627	static
628	int sh_gpg_check_file_sign(int fd, char * sign_id, char * sign_fp,
629	char * homedir, int whichfile)
630	{
631	struct stat buf;
632	char line[256];
633	sh_gpg_popen_t source;
634	int have_id = BAD, have_fp = BAD, status = 0;
635	#ifdef WITH_PGP
636	char *ptr;
637	#endif
638
639	#ifdef HAVE_GPG_CHECKSUM
640	SL_TICKET checkfd;
641	#endif
642
643	SL_ENTER(_("sh_gpg_check_file_sign"));
644
645	/* check whether GnuPG exists and has the correct checksum
646	*/
647	#if defined(WITH_GPG)
648
649	TPT(((0), FIL__, __LINE__, _("msg=<Check signature>\n")));
650	TPT(((0), FIL__, __LINE__, _("msg=<gpg is %s>\n"), DEFAULT_GPG_PATH));
651
652	if (0 != retry_lstat(FIL__, __LINE__, DEFAULT_GPG_PATH, &buf))
653	{
654	status = errno;
655	sh_error_handle(SH_ERR_ERR, FIL__, __LINE__, status, MSG_ERR_LSTAT,
656	sh_error_message(status), DEFAULT_GPG_PATH);
657	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
658	}
659
660	if (0 != tf_trust_check (DEFAULT_GPG_PATH, SL_YESPRIV))
661	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
662
663	#ifdef HAVE_GPG_CHECKSUM
664	checkfd = sl_open_read(DEFAULT_GPG_PATH, SL_YESPRIV);
665
666	if (0 != sh_gpg_checksum(checkfd, 1))
667	{
668	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
669	_("Checksum mismatch"),
670	_("gpg_check_file_sign"));
671	sl_close(checkfd);
672	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
673	}
674	sl_close(checkfd);
675	#endif
676
677	#elif defined(WITH_PGP)
678
679	TPT(((0), FIL__, __LINE__, _("msg=<Check signature>\n")));
680	TPT(((0), FIL__, __LINE__, _("msg=<pgp is %s>\n"), DEFAULT_PGP_PATH));
681
682	if (0 != retry_lstat(FIL__, __LINE__, DEFAULT_PGP_PATH, &buf))
683	{
684	status = errno;
685	sh_error_handle(SH_ERR_ERR, FIL__, __LINE__, status, MSG_ERR_LSTAT,
686	sh_error_message(status), DEFAULT_PGP_PATH);
687	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
688	}
689	if (0 != tf_trust_check (DEFAULT_PGP_PATH, SL_YESPRIV))
690	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
691
692	#ifdef HAVE_GPG_CHECKSUM
693	checkfd = sl_open_read(DEFAULT_PGP_PATH, SL_YESPRIV);
694
695	if (0 != sh_gpg_checksum(checkfd, 1))
696	{
697	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
698	_("Checksum mismatch"),
699	_("gpg_check_file_sign"));
700	sl_close(checkfd);
701	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
702	}
703	sl_close(checkfd);
704	#endif
705
706	#endif
707
708	TPT(((0), FIL__, __LINE__, _("msg=<Open pipe to check signature>\n")));
709
710	fflush(NULL);
711
712	source.pipe = sh_gpg_popen ( &source, fd, 0, NULL, homedir );
713
714	if (NULL == source.pipe)
715	{
716	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
717	_("Could not open pipe"),
718	_("gpg_check_file_sign"));
719	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
720	}
721
722	TPT(((0), FIL__, __LINE__, _("msg=<Open pipe success>\n")));
723
724	xagain:
725
726	errno = 0;
727
728	while (NULL != fgets(line, sizeof(line), source.pipe))
729	{
730
731	TPT(((0), FIL__, __LINE__, _("msg=<gpg out: %s>\n"), line));
732	if (line[strlen(line)-1] == '\n')
733	line[strlen(line)-1] = ' ';
734	sh_error_handle(SH_ERR_ALL, FIL__, __LINE__, 0, MSG_E_SUBGEN,
735	line,
736	_("gpg_check_file_sign"));
737
738	if (sl_strlen(line) < 18)
739	continue;
740	#if defined(WITH_GPG)
741	/* Sun May 27 18:40:05 CEST 2001
742	*/
743	if (0 == sl_strncmp(_("BADSIG"), &line[9], 6) \|\|
744	0 == sl_strncmp(_("ERRSIG"), &line[9], 6) \|\|
745	0 == sl_strncmp(_("NO_PUBKEY"), &line[9], 6) \|\|
746	0 == sl_strncmp(_("NODATA"), &line[9], 6) \|\|
747	0 == sl_strncmp(_("SIGEXPIRED"), &line[9], 6))
748	{
749	if (0 == sl_strncmp(_("BADSIG"), &line[9], 6)) {
750	dlog(1, FIL__, __LINE__,
751	_("%s file is signed, but the signature is invalid."),
752	((whichfile == 1) ? _("Configuration") : _("Database")));
753	}
754	else if (0 == sl_strncmp(_("NO_PUBKEY"), &line[9], 6)) {
755	dlog(1, FIL__, __LINE__,
756	_("%s file is signed, but the public key to verify the signature is not in my keyring %s/.gnupg/pubring.asc."),
757	((whichfile == 1) ? _("Configuration") : _("Database")),
758	homedir);
759	}
760	else if (0 == sl_strncmp(_("ERRSIG"), &line[9], 6)) {
761	dlog(1, FIL__, __LINE__,
762	_("%s file is signed, but the public key to verify the signature is not in my keyring %s/.gnupg/pubring.asc."),
763	((whichfile == 1) ? _("Configuration") : _("Database")),
764	homedir);
765	}
766	else if (0 == sl_strncmp(_("SIGEXPIRED"), &line[9], 6)) {
767	dlog(1, FIL__, __LINE__,
768	_("%s file is signed, but the public key to verify the signature has expired."),
769	((whichfile == 1) ? _("Configuration") : _("Database")));
770	}
771	else if (0 == sl_strncmp(_("NODATA"), &line[9], 6)) {
772	dlog(1, FIL__, __LINE__,
773	_("%s file is not signed."),
774	((whichfile == 1) ? _("Configuration") : _("Database")));
775	}
776
777	have_fp = BAD; have_id = BAD;
778	break;
779	}
780	if (0 == sl_strncmp(_("GOODSIG"), &line[9], 7))
781	{
782	sl_strlcpy (sign_id, &line[25], SH_MINIBUF+1);
783	sign_id[sl_strlen(sign_id)-1] = '\0'; /* remove trailing '"' */
784	have_id = GOOD;
785	}
786	if (0 == sl_strncmp(_("VALIDSIG"), &line[9], 8))
787	{
788	strncpy (sign_fp, &line[18], 40);
789	sign_fp[40] = '\0';
790	have_fp = GOOD;
791	}
792	#elif defined(WITH_PGP)
793	if (0 == sl_strncmp(_("Bad signature"), line, 13) \|\|
794	0 == sl_strncmp(_("Error"), line, 5) \|\|
795	0 == sl_strncmp(_("Malformed"), line, 9) \|\|
796	0 == sl_strncmp(_("WARNING"), line, 7) \|\|
797	0 == sl_strncmp(_("ERROR"), line, 5)
798	)
799	{
800	have_fp = BAD; have_id = BAD;
801	break;
802	}
803	if (0 == sl_strncmp(_("Good signature"), line, 14))
804	{
805	ptr = strchr ( line, '"');
806	++ptr;
807	sl_strlcpy (sign_id, ptr, SH_MINIBUF+1);
808	sign_id[sl_strlen(sign_id)-1] = '\0'; /* remove trailing dot */
809	sign_id[sl_strlen(sign_id)-2] = '\0'; /* remove trailing '"' */
810	have_id = GOOD;
811	}
812	#endif
813	}
814
815	if (ferror(source.pipe) && errno == EAGAIN)
816	{
817	clearerr(source.pipe);
818	goto xagain;
819	}
820
821	sh_gpg_pclose (&source);
822
823	TPT(((0), FIL__, __LINE__, _("msg=<Close pipe>\n")));
824
825	#ifdef WITH_PGP
826	/* get the fingerprint */
827
828	source.pipe = sh_gpg_popen ( &source, fd, 1, sign_id, homedir);
829	if (NULL == source.pipe)
830	{
831	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
832	_("Could not open pipe for fp"),
833	_("gpg_check_file_sign"));
834	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
835	}
836
837	TPT(((0), FIL__, __LINE__, _("msg=<Open pipe success>\n")));
838
839	yagain:
840
841	errno = 0;
842
843	while (NULL != fgets(line, sizeof(line), source.pipe))
844	{
845	if (line[strlen(line)-1] == '\n')
846	line[strlen(line)-1] = ' ';
847	sh_error_handle(SH_ERR_ALL, FIL__, __LINE__, 0, MSG_E_SUBGEN,
848	line,
849	_("gpg_check_file_sign"));
850
851	if (sl_strlen(line) < 18)
852	continue;
853	ptr = strtok (line, " ");
854	while (ptr)
855	{
856	ptr = strtok (NULL, " ");
857	if (ptr && 0 == sl_strncmp (ptr, _("fingerprint"), 11))
858	{
859	ptr = strtok (NULL, " "); /* to '=' */
860	sign_fp[0] = '\0';
861	while (ptr)
862	{
863	ptr = strtok (NULL, " "); /* part of fingerprint */
864	sl_strlcat (sign_fp, ptr, SH_MINIBUF+1);
865	}
866	/* sign_fp[sl_strlen(sign_fp)-1] = '\0'; remove trailing '\n' */
867	if (sl_strlen(sign_fp) > 0)
868	have_fp = GOOD;
869	break;
870	}
871	}
872	}
873
874	if (ferror(source.pipe) && errno == EAGAIN)
875	{
876	clearerr(source.pipe);
877	goto yagain;
878	}
879
880	sh_gpg_pclose (&source);
881	#endif
882
883	if (have_id == GOOD)
884	{
885	TPT(((0), FIL__, __LINE__, _("msg=<Got signator ID>\n")));
886	;
887	}
888	if (have_fp == GOOD)
889	{
890	TPT(((0), FIL__, __LINE__, _("msg=<Got fingerprint>\n")));
891	;
892	}
893
894	if (have_id == GOOD && have_fp == GOOD)
895	SL_RETURN( SH_GPG_OK, _("sh_gpg_check_file_sign"));
896	else
897	{
898	if (have_id == BAD)
899	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
900	_("No good signature"),
901	_("gpg_check_file_sign"));
902	else
903	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
904	_("No fingerprint for key"),
905	_("gpg_check_file_sign"));
906	SL_RETURN( SH_GPG_BADSIGN, _("sh_gpg_check_file_sign"));
907	}
908	}
909
910	int get_the_fd(SL_TICKET file_1);
911
912	int sh_gpg_check_sign (long file_1, long file_2, int what)
913	{
914	int status = SH_GPG_BAD;
915	int fd1 = 0;
916	int fd2 = 0;
917	static int smsg = S_FALSE;
918	char * tmp;
919	char * tmp2;
920
921	char * homedir = sh.effective.home;
922	#if defined(SH_WITH_SERVER)
923	struct passwd * tempres;
924	#endif
925	#ifdef USE_FINGERPRINT
926	#include "sh_gpg_fp.h"
927	#endif
928
929	SL_ENTER(_("sh_gpg_check_sign"));
930
931
932	if (what == 0 \|\| what == 1)
933	fd1 = get_the_fd(file_1);
934	if (what == 0 \|\| what == 2)
935	fd2 = get_the_fd(file_2);
936
937
938	if (fd1 < 0 \|\| fd2 < 0)
939	{
940	TPT(((0), FIL__, __LINE__, _("msg=<GPG_CHECK: FD1 = %d>\n"), fd1));
941	TPT(((0), FIL__, __LINE__, _("msg=<GPG_CHECK: FD2 = %d>\n"), fd2));
942	dlog(1, FIL__, __LINE__,
943	_("This looks like an unexpected internal error.\n"));
944	sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_EXIT_ABORT1, sh.prg_name);
945	aud_exit (FIL__, __LINE__, EXIT_FAILURE);
946	SL_RETURN( (-1), _("sh_gpg_check_sign"));
947	}
948
949	if (what == 0 \|\| what == 1)
950	{
951	TPT(((0), FIL__, __LINE__, _("msg=<GPG_CHECK: FD1 = %d>\n"), fd1));
952	#if defined(SH_WITH_SERVER)
953	tempres = getpwnam(DEFAULT_IDENT);
954	if (!tempres)
955	tempres = sh_getpwnam(DEFAULT_IDENT);
956	if ((tempres != NULL) && (0 == sl_ret_euid()))
957	{
958	/* privileges not dropped yet*/
959	homedir = tempres->pw_dir;
960	}
961	#endif
962	status = sh_gpg_check_file_sign(fd1, gp.conf_id, gp.conf_fp, homedir, 1);
963	TPT(((0), FIL__, __LINE__, _("msg=<CONF SIGUSR: \|%s\|>\n"), gp.conf_id));
964	TPT(((0), FIL__, __LINE__, _("msg=<CONF SIGFP: \|%s\|>\n"), gp.conf_fp));
965	}
966
967	if ((what == 0 && SH_GPG_OK == status) \|\| what == 2)
968	{
969	TPT(((0), FIL__, __LINE__, _("msg=<GPG_CHECK: FD2 = %d>\n"), fd2));
970	#if defined(SH_WITH_SERVER)
971	tempres = getpwnam(DEFAULT_IDENT);
972	if (!tempres)
973	tempres = sh_getpwnam(DEFAULT_IDENT);
974	if ((tempres != NULL) && (0 == sl_ret_euid()))
975	{
976	/* privileges not dropped yet*/
977	homedir = tempres->pw_dir;
978	}
979	#endif
980	status = sh_gpg_check_file_sign(fd2, gp.data_id, gp.data_fp, homedir, 2);
981	TPT(((0), FIL__, __LINE__, _("msg=<DATA SIGUSR: \|%s\|>\n"), gp.data_id));
982	TPT(((0), FIL__, __LINE__, _("msg=<DATA SIGFP: \|%s\|>\n"), gp.data_fp));
983	}
984
985	if (SH_GPG_OK == status && what == 1)
986	{
987	#ifdef USE_FINGERPRINT
988	if ((sl_strcmp(SH_GPG_FP, gp.conf_fp) == 0))
989	{
990	int i;
991
992	for(i = 0; i < (int) sl_strlen(gp.conf_fp); ++i)
993	{
994	if (gpgfp[i] != gp.conf_fp[i])
995	{
996	sh_error_handle(SH_ERR_SEVERE, FIL__, __LINE__, 0,
997	MSG_E_GPG_FP,
998	gpgfp, gp.conf_fp);
999	break;
1000	}
1001	}
1002
1003	if (smsg == S_FALSE)
1004	{
1005	tmp = sh_util_safe_name(gp.conf_id);
1006	sh_gpg_fill_startup (__LINE__,
1007	/* sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_START_GH, */
1008	sh.prg_name, sh.real.uid,
1009	(sh.flag.hidefile == S_TRUE) ?
1010	_("(hidden)") : file_path('C', 'R'),
1011	tmp,
1012	gp.conf_fp);
1013	SH_FREE(tmp);
1014	}
1015	smsg = S_TRUE;
1016	SL_RETURN(0, _("sh_gpg_check_sign"));
1017	}
1018	else
1019	{
1020	/* fp mismatch
1021	*/
1022	dlog(1, FIL__, __LINE__,
1023	_("The fingerprint of the signing key: %s\ndoes not match the compiled-in fingerprint: %s.\nTherefore the signature could not be verified.\n"),
1024	gp.conf_fp, SH_GPG_FP);
1025	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
1026	_("Fingerprint mismatch"),
1027	_("gpg_check_sign"));
1028	status = SH_GPG_BADSIGN;
1029	}
1030	#else
1031	if (smsg == S_FALSE)
1032	{
1033	tmp = sh_util_safe_name(gp.conf_id);
1034	sh_gpg_fill_startup (__LINE__,
1035	/* sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_START_GH, */
1036	sh.prg_name, sh.real.uid,
1037	(sh.flag.hidefile == S_TRUE) ?
1038	_("(hidden)") : file_path('C', 'R'),
1039	tmp,
1040	gp.conf_fp);
1041	SH_FREE(tmp);
1042	}
1043	smsg = S_TRUE;
1044	SL_RETURN(0, _("sh_gpg_check_sign"));
1045	#endif
1046	}
1047
1048	else if (SH_GPG_OK == status && (what == 2 \|\| what == 0))
1049	{
1050	if ((sl_strcmp(gp.data_id, gp.conf_id) == 0) &&
1051	(sl_strcmp(gp.data_fp, gp.conf_fp) == 0))
1052	{
1053	SL_RETURN(0, _("sh_gpg_check_sign"));
1054	}
1055	else
1056	{
1057	/* ID or fp not equal
1058	*/
1059	dlog(1, FIL__, __LINE__,
1060	_("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"));
1061	tmp = sh_util_safe_name (gp.conf_id);
1062	tmp2 = sh_util_safe_name (gp.data_id);
1063	sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_START_GH2,
1064	sh.prg_name, sh.real.uid,
1065	(sh.flag.hidefile == S_TRUE) ? _("(hidden)") : file_path('C', 'R'),
1066	tmp, gp.conf_fp,
1067	(sh.flag.hidefile == S_TRUE) ? _("(hidden)") : file_path('D', 'R'),
1068	tmp2, gp.data_fp);
1069	SH_FREE(tmp);
1070	SH_FREE(tmp2);
1071	}
1072	}
1073
1074	if (status != SH_GPG_OK)
1075	{
1076	uid_t e_uid = sl_ret_euid();
1077	char * e_home = sh.effective.home;
1078
1079	#if defined(SH_WITH_SERVER)
1080	struct passwd * e_tempres = getpwnam(DEFAULT_IDENT);
1081	if (!e_tempres)
1082	e_tempres = sh_getpwnam(DEFAULT_IDENT);
1083	if ((e_tempres != NULL) && (0 == sl_ret_euid()))
1084	{
1085	/* privileges not dropped yet */
1086	e_uid = e_tempres->pw_uid;
1087	e_home = e_tempres->pw_dir;
1088	}
1089	#endif
1090	dlog(1, FIL__, __LINE__,
1091	_("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"),
1092	#if defined(WITH_GPG)
1093	DEFAULT_GPG_PATH,
1094	#else
1095	DEFAULT_PGP_PATH,
1096	#endif
1097	(int) e_uid, e_home);
1098	}
1099
1100	TPT(((0), FIL__, __LINE__, _("msg=<Status = %d>\n"), status));
1101
1102	sh_error_handle((-1), FIL__, __LINE__, status, MSG_EXIT_ABORT1, sh.prg_name);
1103	aud_exit (FIL__, __LINE__, EXIT_FAILURE);
1104
1105	return (-1); /* make compiler happy */
1106	}
1107
1108	/* #ifdef WITH_GPG */
1109	#endif
1110
1111
1112
1113
1114
1115
1116
1117

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