Context Navigation

source: branches/samhain-2_2-branch/src/sh_gpg.c@ 216

Last change on this file since 216 was 34, checked in by rainer, 18 years ago
Code cleanup and minor fixes
File size: 29.0 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	static int sh_gpg_checksum (SL_TICKET checkfd, int flag)
118	{
119	char * test_gpg;
120	char * test_ptr1 = NULL;
121	char * test_ptr2 = NULL;
122	char wstrip1[128];
123	char wstrip2[128];
124	int i, k;
125	#include "sh_gpg_chksum.h"
126
127	SL_ENTER(_("sh_gpg_checksum"));
128
129	tiger_fd = checkfd;
130	#if defined(WITH_PGP)
131	test_gpg = sh_tiger_hash_gpg (DEFAULT_PGP_PATH, TIGER_FD, 0);
132	#else
133	test_gpg = sh_tiger_hash_gpg (DEFAULT_GPG_PATH, TIGER_FD, 0);
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	static FILE * sh_gpg_popen (sh_gpg_popen_t *source, int fd,
206	int mode, char * id, char * homedir)
207	{
208	int pipedes[2];
209	FILE * outf = NULL;
210	char * envp[2];
211	size_t len;
212	char path[256];
213	char cc1[32];
214	char cc2[32];
215	#if defined(WITH_PGP)
216	char cc3[32];
217	char cc0[3] = "-f";
218	#endif
219	#if defined(WITH_GPG)
220	char cc0[2] = "-";
221	char cc3[32];
222	char cc4[SH_PATHBUF+32];
223	char cc5[32] = "--no-tty";
224	#endif
225
226	char * arg[9];
227
228	#if defined(HAVE_GPG_CHECKSUM)
229	SL_TICKET checkfd;
230	int myrand;
231	int i;
232	#if defined(__linux__)
233	int get_the_fd(SL_TICKET);
234	char pname[128];
235	int pfd;
236	#endif
237	#endif
238
239	SL_ENTER(_("sh_gpg_popen"));
240
241	#if defined(WITH_GPG)
242	/* -- GnuPG -- */
243	sl_strlcpy (path, DEFAULT_GPG_PATH, 256);
244	sl_strlcpy (cc1, _("--status-fd"), 32);
245	sl_strlcpy (cc2, _("--verify"), 32);
246	sl_strlcpy (cc3, _("--homedir"), 32);
247	/* sl_strlcpy (cc4, sh.effective.home, SH_PATHBUF+32); */
248	sl_strlcpy (cc4, homedir, SH_PATHBUF+32);
249	sl_strlcat (cc4, _("/.gnupg"), SH_PATHBUF+32);
250
251	/* fprintf(stderr, "YULE: homedir=%s\n", homedir); */
252
253	#if defined(SH_WITH_SERVER)
254	if (0 == sl_ret_euid()) /* privileges not dropped yet */
255	{
256	struct stat lbuf;
257	int status_stat = 0;
258	struct passwd * tempres = getpwnam(DEFAULT_IDENT);
259	if (!tempres)
260	tempres = sh_getpwnam(DEFAULT_IDENT);
261	if (!tempres)
262	{
263	dlog(1, FIL__, __LINE__,
264	_("User %s does not exist. Please add the user to your system.\n"),
265	DEFAULT_IDENT);
266	status_stat = -1;
267	}
268	if (!tempres->pw_dir \|\| tempres->pw_dir[0] == '\0')
269	{
270	dlog(1, FIL__, __LINE__,
271	_("User %s does not have a home directory.\nPlease add the home directory for this user to your system.\n"),
272	DEFAULT_IDENT);
273	status_stat = -2;
274	}
275	if (status_stat == 0)
276	{
277	sl_strlcpy (cc4, tempres->pw_dir, SH_PATHBUF+32);
278	sl_strlcat (cc4, _("/.gnupg"), SH_PATHBUF+32);
279	status_stat = retry_lstat(FIL__, __LINE__, cc4, &lbuf);
280	if (status_stat == -1)
281	{
282	dlog(1, FIL__, __LINE__,
283	_("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"),
284	cc4, DEFAULT_IDENT);
285	status_stat = -3;
286	}
287	}
288	if (status_stat == 0 && lbuf.st_uid != tempres->pw_uid)
289	{
290	dlog(1, FIL__, __LINE__,
291	_("Gnupg directory %s\nis not owned by user %s.\n"),
292	cc4, DEFAULT_IDENT);
293	status_stat = -4;
294	}
295	if (status_stat == 0)
296	{
297	sl_strlcat (cc4, _("/pubring.gpg"), SH_PATHBUF+32);
298	status_stat = retry_lstat(FIL__, __LINE__, cc4, &lbuf);
299	if (status_stat == -1)
300	{
301	dlog(1, FIL__, __LINE__,
302	_("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"),
303	cc4, DEFAULT_IDENT);
304	status_stat = -5;
305	}
306	}
307	if (status_stat == 0 && lbuf.st_uid != tempres->pw_uid)
308	{
309	dlog(1, FIL__, __LINE__,
310	_("Gnupg public keyring %s\nis not owned by user %s.\n"),
311	cc4, DEFAULT_IDENT);
312	status_stat = -6;
313	}
314	if (status_stat != 0)
315	{
316	sh_error_handle((-1), FIL__, __LINE__, status_stat, MSG_EXIT_ABORT1,
317	sh.prg_name);
318	aud_exit (FIL__, __LINE__, EXIT_FAILURE);
319	}
320	sl_strlcpy (cc4, tempres->pw_dir, SH_PATHBUF+32);
321	sl_strlcat (cc4, _("/.gnupg"), SH_PATHBUF+32);
322	}
323	#endif
324
325	arg[0] = path;
326	arg[1] = cc1;
327	arg[2] = "1";
328	arg[3] = cc2;
329	arg[4] = cc3;
330	arg[5] = cc4;
331	arg[6] = cc5;
332	arg[7] = cc0;
333	arg[8] = NULL;
334
335	/* catch 'unused parameter' compiler warning
336	*/
337	(void) mode;
338	(void) id;
339	#elif defined(WITH_PGP)
340	/* -- PGP -- */
341	sl_strlcpy (path, DEFAULT_PGP_PATH, 256);
342	if (mode == 0)
343	{
344	sl_strlcpy (cc1, _("+language=en"), 32);
345	sl_strlcpy (cc2, _("-o"), 32);
346	sl_strlcpy (cc3, _("/dev/null"), 32);
347
348	arg[0] = path;
349	arg[1] = cc1;
350	arg[2] = cc2;
351	arg[3] = cc3;
352	arg[4] = cc0;
353	arg[5] = NULL;
354	}
355	else
356	{
357	sl_strlcpy (cc1, _("+language=en"), 32);
358	sl_strlcpy (cc2, _("-kvc"), 32);
359
360	arg[0] = path;
361	arg[1] = cc1;
362	arg[2] = cc2;
363	arg[3] = id;
364	arg[4] = NULL;
365	arg[5] = NULL;
366	}
367	#endif
368
369	/* use homedir of effective user
370	*/
371	if (sh.effective.home != NULL)
372	{
373	len = sl_strlen(sh.effective.home) + 6;
374	envp[0] = malloc (len); /* free() ok */
375	if (envp[0] != NULL)
376	sl_snprintf (envp[0], len, "HOME=%s", sh.effective.home);
377	envp[1] = NULL;
378	}
379	else
380	{
381	envp[0] = NULL;
382	}
383
384	/* Create the pipe
385	*/
386	if (aud_pipe(FIL__, __LINE__, pipedes) < 0)
387	{
388	if (envp[0] != NULL)
389	free(envp[0]);
390	SL_RETURN( (NULL), _("sh_gpg_popen"));
391	}
392
393	source->pid = aud_fork(FIL__, __LINE__);
394
395	/* Failure
396	*/
397	if (source->pid == (pid_t) - 1)
398	{
399	close(pipedes[0]);
400	close(pipedes[1]);
401	if (envp[0] != NULL)
402	free(envp[0]);
403	SL_RETURN( (NULL), _("sh_gpg_popen"));
404	}
405
406	if (source->pid == (pid_t) 0)
407	{
408
409	/* child - make read side of the pipe stdout
410	*/
411	if (retry_aud_dup2(FIL__, __LINE__,
412	pipedes[STDOUT_FILENO], STDOUT_FILENO) < 0)
413	{
414	TPT(((0), FIL__, __LINE__, _("msg=<dup2 on pipe failed>\n")));
415	dlog(1, FIL__, __LINE__, _("Internal error: dup2 failed\n"));
416	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
417	}
418
419	/* close the pipe descriptors
420	*/
421	close (pipedes[STDIN_FILENO]);
422	close (pipedes[STDOUT_FILENO]);
423
424
425	#if defined(WITH_PGP)
426	if (mode == 0)
427	{
428	if (retry_aud_dup2(FIL__, __LINE__, fd, STDIN_FILENO) < 0)
429	{
430	TPT(((0), FIL__, __LINE__, _("msg=<dup2 on fd failed>\n")));
431	dlog(1, FIL__, __LINE__, _("Internal error: dup2 failed\n"));
432	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
433	}
434	}
435	#else
436	if (retry_aud_dup2(FIL__, __LINE__, fd, STDIN_FILENO) < 0)
437	{
438	TPT(((0), FIL__, __LINE__, _("msg=<dup2 on fd failed>\n")));
439	dlog(1, FIL__, __LINE__, _("Internal error: dup2 failed\n"));
440	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
441	}
442	#endif
443
444	/* don't leak file descriptors
445	*/
446	sh_unix_closeall (3, -1); /* in child process */
447
448	freopen(_("/dev/null"), "r+", stderr);
449
450	/* We should become privileged if SUID,
451	* to be able to read the keyring.
452	* We have checked that gpg is OK,
453	* AND that only a trusted user could overwrite
454	* gpg.
455	*/
456	memset (skey, '\0', sizeof(sh_key_t));
457	aud_setuid(FIL__, __LINE__, geteuid());
458
459	PDBGC_OPEN;
460	PDBGC_D((int)getuid());
461	PDBGC_D((int)geteuid());
462
463	{
464	int i = 0;
465	while (arg[i] != NULL)
466	{
467	PDBGC_S(arg[i]);
468	++i;
469	}
470	}
471	PDBGC_CLOSE;
472
473	/* exec the program */
474
475	#if defined(__linux__) && defined(HAVE_GPG_CHECKSUM)
476	/*
477	* -- emulate an fexecve with checksum testing
478	*/
479	#if defined(WITH_PGP)
480	checkfd = sl_open_read(DEFAULT_PGP_PATH, SL_NOPRIV);
481	#else
482	checkfd = sl_open_read(DEFAULT_GPG_PATH, SL_NOPRIV);
483	#endif
484
485	if (0 != sh_gpg_checksum(checkfd, 0))
486	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
487
488	pfd = get_the_fd(checkfd);
489	sl_snprintf(pname, sizeof(pname), _("/proc/self/fd/%d"), pfd);
490	if (0 == access(pname, R_OK\|X_OK)) /* flawfinder: ignore */
491
492	{
493	fcntl (pfd, F_SETFD, FD_CLOEXEC);
494	retry_aud_execve (FIL__, __LINE__, pname, arg, envp);
495
496	dlog(1, FIL__, __LINE__, _("Unexpected error: execve %s failed\n"),
497	pname);
498	/* failed
499	*/
500	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
501	}
502
503	/* procfs not working, go ahead
504	*/
505	sl_close(checkfd);
506	#endif
507
508	#if defined(HAVE_GPG_CHECKSUM)
509	/* This is an incredibly ugly kludge to prevent an attacker
510	* from knowing when it is safe to slip in a fake executable
511	* between the integrity check and the execve
512	*/
513	myrand = (int) taus_get (&(skey->rng0[0]), &(skey->rng1[0]),
514	&(skey->rng2[0]));
515	myrand = (myrand < 0) ? (-myrand) : myrand;
516	myrand = (myrand % 32) + 2;
517
518	for (i = 0; i < myrand; ++i)
519	{
520	#if defined(WITH_PGP)
521	checkfd = sl_open_fastread(DEFAULT_PGP_PATH, SL_NOPRIV);
522	#else
523	checkfd = sl_open_fastread(DEFAULT_GPG_PATH, SL_NOPRIV);
524	#endif
525	if (0 != sh_gpg_checksum(checkfd, 0)) {
526	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
527	}
528	sl_close(checkfd);
529	}
530	#endif
531
532
533	#if defined(WITH_GPG)
534	retry_aud_execve (FIL__, __LINE__, DEFAULT_GPG_PATH, arg, envp);
535	dlog(1, FIL__, __LINE__, _("Unexpected error: execve %s failed\n"),
536	DEFAULT_GPG_PATH);
537	#elif defined(WITH_PGP)
538	retry_aud_execve (FIL__, __LINE__, DEFAULT_PGP_PATH, arg, envp);
539	#endif
540
541	/* failed
542	*/
543	TPT(((0), FIL__, __LINE__, _("msg=<execve failed>\n")));
544	dlog(1, FIL__, __LINE__, _("Unexpected error: execve failed\n"));
545	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
546	}
547
548	/* parent
549	*/
550
551	if (envp[0] != NULL)
552	free(envp[0]);
553
554	close (pipedes[STDOUT_FILENO]);
555	retry_fcntl (FIL__, __LINE__, pipedes[STDIN_FILENO], F_SETFD, FD_CLOEXEC);
556	retry_fcntl (FIL__, __LINE__, pipedes[STDIN_FILENO], F_SETFL, O_NONBLOCK);
557
558	outf = fdopen (pipedes[STDIN_FILENO], "r");
559
560	if (outf == NULL)
561	{
562	aud_kill (FIL__, __LINE__, source->pid, SIGKILL);
563	close (pipedes[STDOUT_FILENO]);
564	waitpid (source->pid, NULL, 0);
565	source->pid = 0;
566	SL_RETURN( (NULL), _("sh_gpg_popen"));
567	}
568
569	SL_RETURN( (outf), _("sh_gpg_popen"));
570	}
571
572
573	static int sh_gpg_pclose (sh_gpg_popen_t *source)
574	{
575	int status = 0;
576
577	SL_ENTER(_("sh_gpg_pclose"));
578
579	status = fclose(source->pipe);
580	if (status)
581	SL_RETURN( (-1), _("sh_gpg_pclose"));
582
583	if (waitpid(source->pid, NULL, 0) != source->pid)
584	status = -1;
585
586	source->pipe = NULL;
587	source->pid = 0;
588	SL_RETURN( (status), _("sh_gpg_pclose"));
589	}
590
591	static
592	int sh_gpg_check_file_sign(int fd, char * sign_id, char * sign_fp,
593	char * homedir, int whichfile)
594	{
595	struct stat buf;
596	char line[256];
597	sh_gpg_popen_t source;
598	int have_id = BAD, have_fp = BAD, status = 0;
599	#ifdef WITH_PGP
600	char *ptr;
601	#endif
602
603	#ifdef HAVE_GPG_CHECKSUM
604	SL_TICKET checkfd;
605	#endif
606
607	SL_ENTER(_("sh_gpg_check_file_sign"));
608
609	/* check whether GnuPG exists and has the correct checksum
610	*/
611	#if defined(WITH_GPG)
612
613	TPT(((0), FIL__, __LINE__, _("msg=<Check signature>\n")));
614	TPT(((0), FIL__, __LINE__, _("msg=<gpg is %s>\n"), DEFAULT_GPG_PATH));
615
616	if (0 != retry_lstat(FIL__, __LINE__, DEFAULT_GPG_PATH, &buf))
617	{
618	status = errno;
619	sh_error_handle(SH_ERR_ERR, FIL__, __LINE__, status, MSG_ERR_LSTAT,
620	sh_error_message(status), DEFAULT_GPG_PATH);
621	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
622	}
623
624	if (0 != tf_trust_check (DEFAULT_GPG_PATH, SL_YESPRIV))
625	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
626
627	#ifdef HAVE_GPG_CHECKSUM
628	checkfd = sl_open_read(DEFAULT_GPG_PATH, SL_YESPRIV);
629
630	if (0 != sh_gpg_checksum(checkfd, 1))
631	{
632	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
633	_("Checksum mismatch"),
634	_("gpg_check_file_sign"));
635	sl_close(checkfd);
636	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
637	}
638	sl_close(checkfd);
639	#endif
640
641	#elif defined(WITH_PGP)
642
643	TPT(((0), FIL__, __LINE__, _("msg=<Check signature>\n")));
644	TPT(((0), FIL__, __LINE__, _("msg=<pgp is %s>\n"), DEFAULT_PGP_PATH));
645
646	if (0 != retry_lstat(FIL__, __LINE__, DEFAULT_PGP_PATH, &buf))
647	{
648	status = errno;
649	sh_error_handle(SH_ERR_ERR, FIL__, __LINE__, status, MSG_ERR_LSTAT,
650	sh_error_message(status), DEFAULT_PGP_PATH);
651	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
652	}
653	if (0 != tf_trust_check (DEFAULT_PGP_PATH, SL_YESPRIV))
654	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
655
656	#ifdef HAVE_GPG_CHECKSUM
657	checkfd = sl_open_read(DEFAULT_PGP_PATH, SL_YESPRIV);
658
659	if (0 != sh_gpg_checksum(checkfd, 1))
660	{
661	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
662	_("Checksum mismatch"),
663	_("gpg_check_file_sign"));
664	sl_close(checkfd);
665	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
666	}
667	sl_close(checkfd);
668	#endif
669
670	#endif
671
672	TPT(((0), FIL__, __LINE__, _("msg=<Open pipe to check signature>\n")));
673
674	fflush(NULL);
675
676	source.pipe = sh_gpg_popen ( &source, fd, 0, NULL, homedir );
677
678	if (NULL == source.pipe)
679	{
680	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
681	_("Could not open pipe"),
682	_("gpg_check_file_sign"));
683	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
684	}
685
686	TPT(((0), FIL__, __LINE__, _("msg=<Open pipe success>\n")));
687
688	xagain:
689
690	errno = 0;
691
692	while (NULL != fgets(line, sizeof(line), source.pipe))
693	{
694
695	TPT(((0), FIL__, __LINE__, _("msg=<gpg out: %s>\n"), line));
696	if (line[strlen(line)-1] == '\n')
697	line[strlen(line)-1] = ' ';
698	sh_error_handle(SH_ERR_ALL, FIL__, __LINE__, 0, MSG_E_SUBGEN,
699	line,
700	_("gpg_check_file_sign"));
701
702	if (sl_strlen(line) < 18)
703	continue;
704	#if defined(WITH_GPG)
705	/* Sun May 27 18:40:05 CEST 2001
706	*/
707	if (0 == sl_strncmp(_("BADSIG"), &line[9], 6) \|\|
708	0 == sl_strncmp(_("ERRSIG"), &line[9], 6) \|\|
709	0 == sl_strncmp(_("NO_PUBKEY"), &line[9], 6) \|\|
710	0 == sl_strncmp(_("NODATA"), &line[9], 6) \|\|
711	0 == sl_strncmp(_("SIGEXPIRED"), &line[9], 6))
712	{
713	if (0 == sl_strncmp(_("BADSIG"), &line[9], 6)) {
714	dlog(1, FIL__, __LINE__,
715	_("%s file is signed, but the signature is invalid."),
716	((whichfile == 1) ? _("Configuration") : _("Database")));
717	}
718	else if (0 == sl_strncmp(_("NO_PUBKEY"), &line[9], 6)) {
719	dlog(1, FIL__, __LINE__,
720	_("%s file is signed, but the public key to verify the signature is not in my keyring %s/.gnupg/pubring.asc."),
721	((whichfile == 1) ? _("Configuration") : _("Database")),
722	homedir);
723	}
724	else if (0 == sl_strncmp(_("ERRSIG"), &line[9], 6)) {
725	dlog(1, FIL__, __LINE__,
726	_("%s file is signed, but the public key to verify the signature is not in my keyring %s/.gnupg/pubring.asc."),
727	((whichfile == 1) ? _("Configuration") : _("Database")),
728	homedir);
729	}
730	else if (0 == sl_strncmp(_("SIGEXPIRED"), &line[9], 6)) {
731	dlog(1, FIL__, __LINE__,
732	_("%s file is signed, but the public key to verify the signature has expired."),
733	((whichfile == 1) ? _("Configuration") : _("Database")));
734	}
735	else if (0 == sl_strncmp(_("NODATA"), &line[9], 6)) {
736	dlog(1, FIL__, __LINE__,
737	_("%s file is not signed."),
738	((whichfile == 1) ? _("Configuration") : _("Database")));
739	}
740
741	have_fp = BAD; have_id = BAD;
742	break;
743	}
744	if (0 == sl_strncmp(_("GOODSIG"), &line[9], 7))
745	{
746	sl_strlcpy (sign_id, &line[25], SH_MINIBUF+1);
747	sign_id[sl_strlen(sign_id)-1] = '\0'; /* remove trailing '"' */
748	have_id = GOOD;
749	}
750	if (0 == sl_strncmp(_("VALIDSIG"), &line[9], 8))
751	{
752	strncpy (sign_fp, &line[18], 40);
753	sign_fp[40] = '\0';
754	have_fp = GOOD;
755	}
756	#elif defined(WITH_PGP)
757	if (0 == sl_strncmp(_("Bad signature"), line, 13) \|\|
758	0 == sl_strncmp(_("Error"), line, 5) \|\|
759	0 == sl_strncmp(_("Malformed"), line, 9) \|\|
760	0 == sl_strncmp(_("WARNING"), line, 7) \|\|
761	0 == sl_strncmp(_("ERROR"), line, 5)
762	)
763	{
764	have_fp = BAD; have_id = BAD;
765	break;
766	}
767	if (0 == sl_strncmp(_("Good signature"), line, 14))
768	{
769	ptr = strchr ( line, '"');
770	++ptr;
771	sl_strlcpy (sign_id, ptr, SH_MINIBUF+1);
772	sign_id[sl_strlen(sign_id)-1] = '\0'; /* remove trailing dot */
773	sign_id[sl_strlen(sign_id)-2] = '\0'; /* remove trailing '"' */
774	have_id = GOOD;
775	}
776	#endif
777	}
778
779	if (ferror(source.pipe) && errno == EAGAIN)
780	{
781	clearerr(source.pipe);
782	goto xagain;
783	}
784
785	sh_gpg_pclose (&source);
786
787	TPT(((0), FIL__, __LINE__, _("msg=<Close pipe>\n")));
788
789	#ifdef WITH_PGP
790	/* get the fingerprint */
791
792	source.pipe = sh_gpg_popen ( &source, fd, 1, sign_id, homedir);
793	if (NULL == source.pipe)
794	{
795	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
796	_("Could not open pipe for fp"),
797	_("gpg_check_file_sign"));
798	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
799	}
800
801	TPT(((0), FIL__, __LINE__, _("msg=<Open pipe success>\n")));
802
803	yagain:
804
805	errno = 0;
806
807	while (NULL != fgets(line, sizeof(line), source.pipe))
808	{
809	if (line[strlen(line)-1] == '\n')
810	line[strlen(line)-1] = ' ';
811	sh_error_handle(SH_ERR_ALL, FIL__, __LINE__, 0, MSG_E_SUBGEN,
812	line,
813	_("gpg_check_file_sign"));
814
815	if (sl_strlen(line) < 18)
816	continue;
817	ptr = strtok (line, " ");
818	while (ptr)
819	{
820	ptr = strtok (NULL, " ");
821	if (ptr && 0 == sl_strncmp (ptr, _("fingerprint"), 11))
822	{
823	ptr = strtok (NULL, " "); /* to '=' */
824	sign_fp[0] = '\0';
825	while (ptr)
826	{
827	ptr = strtok (NULL, " "); /* part of fingerprint */
828	sl_strlcat (sign_fp, ptr, SH_MINIBUF+1);
829	}
830	/* sign_fp[sl_strlen(sign_fp)-1] = '\0'; remove trailing '\n' */
831	if (sl_strlen(sign_fp) > 0)
832	have_fp = GOOD;
833	break;
834	}
835	}
836	}
837
838	if (ferror(source.pipe) && errno == EAGAIN)
839	{
840	clearerr(source.pipe);
841	goto yagain;
842	}
843
844	sh_gpg_pclose (&source);
845	#endif
846
847	if (have_id == GOOD)
848	{
849	TPT(((0), FIL__, __LINE__, _("msg=<Got signator ID>\n")));
850	;
851	}
852	if (have_fp == GOOD)
853	{
854	TPT(((0), FIL__, __LINE__, _("msg=<Got fingerprint>\n")));
855	;
856	}
857
858	if (have_id == GOOD && have_fp == GOOD)
859	SL_RETURN( SH_GPG_OK, _("sh_gpg_check_file_sign"));
860	else
861	{
862	if (have_id == BAD)
863	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
864	_("No good signature"),
865	_("gpg_check_file_sign"));
866	else
867	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
868	_("No fingerprint for key"),
869	_("gpg_check_file_sign"));
870	SL_RETURN( SH_GPG_BADSIGN, _("sh_gpg_check_file_sign"));
871	}
872	}
873
874	int get_the_fd(SL_TICKET file_1);
875
876	int sh_gpg_check_sign (long file_1, long file_2, int what)
877	{
878	int status = SH_GPG_BAD;
879	int fd1 = 0;
880	int fd2 = 0;
881	static int smsg = S_FALSE;
882	char * tmp;
883	char * tmp2;
884
885	char * homedir = sh.effective.home;
886	#if defined(SH_WITH_SERVER)
887	struct passwd * tempres;
888	#endif
889	#ifdef USE_FINGERPRINT
890	#include "sh_gpg_fp.h"
891	#endif
892
893	SL_ENTER(_("sh_gpg_check_sign"));
894
895
896	if (what == 0 \|\| what == 1)
897	fd1 = get_the_fd(file_1);
898	if (what == 0 \|\| what == 2)
899	fd2 = get_the_fd(file_2);
900
901
902	if (fd1 < 0 \|\| fd2 < 0)
903	{
904	TPT(((0), FIL__, __LINE__, _("msg=<GPG_CHECK: FD1 = %d>\n"), fd1));
905	TPT(((0), FIL__, __LINE__, _("msg=<GPG_CHECK: FD2 = %d>\n"), fd2));
906	dlog(1, FIL__, __LINE__,
907	_("This looks like an unexpected internal error.\n"));
908	sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_EXIT_ABORT1, sh.prg_name);
909	aud_exit (FIL__, __LINE__, EXIT_FAILURE);
910	SL_RETURN( (-1), _("sh_gpg_check_sign"));
911	}
912
913	if (what == 0 \|\| what == 1)
914	{
915	TPT(((0), FIL__, __LINE__, _("msg=<GPG_CHECK: FD1 = %d>\n"), fd1));
916	#if defined(SH_WITH_SERVER)
917	tempres = getpwnam(DEFAULT_IDENT);
918	if (!tempres)
919	tempres = sh_getpwnam(DEFAULT_IDENT);
920	if ((tempres != NULL) && (0 == sl_ret_euid()))
921	{
922	/* privileges not dropped yet*/
923	homedir = tempres->pw_dir;
924	}
925	#endif
926	status = sh_gpg_check_file_sign(fd1, gp.conf_id, gp.conf_fp, homedir, 1);
927	TPT(((0), FIL__, __LINE__, _("msg=<CONF SIGUSR: \|%s\|>\n"), gp.conf_id));
928	TPT(((0), FIL__, __LINE__, _("msg=<CONF SIGFP: \|%s\|>\n"), gp.conf_fp));
929	}
930
931	if ((what == 0 && SH_GPG_OK == status) \|\| what == 2)
932	{
933	TPT(((0), FIL__, __LINE__, _("msg=<GPG_CHECK: FD2 = %d>\n"), fd2));
934	#if defined(SH_WITH_SERVER)
935	tempres = getpwnam(DEFAULT_IDENT);
936	if (!tempres)
937	tempres = sh_getpwnam(DEFAULT_IDENT);
938	if ((tempres != NULL) && (0 == sl_ret_euid()))
939	{
940	/* privileges not dropped yet*/
941	homedir = tempres->pw_dir;
942	}
943	#endif
944	status = sh_gpg_check_file_sign(fd2, gp.data_id, gp.data_fp, homedir, 2);
945	TPT(((0), FIL__, __LINE__, _("msg=<DATA SIGUSR: \|%s\|>\n"), gp.data_id));
946	TPT(((0), FIL__, __LINE__, _("msg=<DATA SIGFP: \|%s\|>\n"), gp.data_fp));
947	}
948
949	if (SH_GPG_OK == status && what == 1)
950	{
951	#ifdef USE_FINGERPRINT
952	if ((sl_strcmp(SH_GPG_FP, gp.conf_fp) == 0))
953	{
954	int i;
955
956	for(i = 0; i < (int) sl_strlen(gp.conf_fp); ++i)
957	{
958	if (gpgfp[i] != gp.conf_fp[i])
959	{
960	sh_error_handle(SH_ERR_SEVERE, FIL__, __LINE__, 0,
961	MSG_E_GPG_FP,
962	gpgfp, gp.conf_fp);
963	break;
964	}
965	}
966
967	if (smsg == S_FALSE)
968	{
969	tmp = sh_util_safe_name(gp.conf_id);
970	sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_START_GH,
971	sh.prg_name, sh.real.uid,
972	(sh.flag.hidefile == S_TRUE) ?
973	_("(hidden)") : file_path('C', 'R'),
974	tmp,
975	gp.conf_fp);
976	SH_FREE(tmp);
977	}
978	smsg = S_TRUE;
979	SL_RETURN(0, _("sh_gpg_check_sign"));
980	}
981	else
982	{
983	/* fp mismatch
984	*/
985	dlog(1, FIL__, __LINE__,
986	_("The fingerprint of the signing key: %s\ndoes not match the compiled-in fingerprint: %s.\nTherefore the signature could not be verified.\n"),
987	gp.conf_fp, SH_GPG_FP);
988	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
989	_("Fingerprint mismatch"),
990	_("gpg_check_sign"));
991	status = SH_GPG_BADSIGN;
992	}
993	#else
994	if (smsg == S_FALSE)
995	{
996	tmp = sh_util_safe_name(gp.conf_id);
997	sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_START_GH,
998	sh.prg_name, sh.real.uid,
999	(sh.flag.hidefile == S_TRUE) ?
1000	_("(hidden)") : file_path('C', 'R'),
1001	tmp,
1002	gp.conf_fp);
1003	SH_FREE(tmp);
1004	}
1005	smsg = S_TRUE;
1006	SL_RETURN(0, _("sh_gpg_check_sign"));
1007	#endif
1008	}
1009
1010	else if (SH_GPG_OK == status && (what == 2 \|\| what == 0))
1011	{
1012	if ((sl_strcmp(gp.data_id, gp.conf_id) == 0) &&
1013	(sl_strcmp(gp.data_fp, gp.conf_fp) == 0))
1014	{
1015	SL_RETURN(0, _("sh_gpg_check_sign"));
1016	}
1017	else
1018	{
1019	/* ID or fp not equal
1020	*/
1021	dlog(1, FIL__, __LINE__,
1022	_("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"));
1023	tmp = sh_util_safe_name (gp.conf_id);
1024	tmp2 = sh_util_safe_name (gp.data_id);
1025	sh_error_handle ((-1), FIL__, __LINE__, 0, MSG_START_GH2,
1026	sh.prg_name, sh.real.uid,
1027	(sh.flag.hidefile == S_TRUE) ? _("(hidden)") : file_path('C', 'R'),
1028	tmp, gp.conf_fp,
1029	(sh.flag.hidefile == S_TRUE) ? _("(hidden)") : file_path('D', 'R'),
1030	tmp2, gp.data_fp);
1031	SH_FREE(tmp);
1032	SH_FREE(tmp2);
1033	}
1034	}
1035
1036	if (status != SH_GPG_OK)
1037	{
1038	uid_t e_uid = sl_ret_euid();
1039	char * e_home = sh.effective.home;
1040
1041	#if defined(SH_WITH_SERVER)
1042	struct passwd * e_tempres = getpwnam(DEFAULT_IDENT);
1043	if (!e_tempres)
1044	e_tempres = sh_getpwnam(DEFAULT_IDENT);
1045	if ((e_tempres != NULL) && (0 == sl_ret_euid()))
1046	{
1047	/* privileges not dropped yet */
1048	e_uid = e_tempres->pw_uid;
1049	e_home = e_tempres->pw_dir;
1050	}
1051	#endif
1052	dlog(1, FIL__, __LINE__,
1053	_("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"),
1054	#if defined(WITH_GPG)
1055	DEFAULT_GPG_PATH,
1056	#else
1057	DEFAULT_PGP_PATH,
1058	#endif
1059	(int) e_uid, e_home);
1060	}
1061
1062	TPT(((0), FIL__, __LINE__, _("msg=<Status = %d>\n"), status));
1063
1064	sh_error_handle((-1), FIL__, __LINE__, status, MSG_EXIT_ABORT1, sh.prg_name);
1065	aud_exit (FIL__, __LINE__, EXIT_FAILURE);
1066
1067	return (-1); /* make compiler happy */
1068	}
1069
1070	/* #ifdef WITH_GPG */
1071	#endif
1072
1073
1074
1075
1076
1077
1078
1079

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

Download in other formats: