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source: trunk/src/sh_gpg.c@ 530

Last change on this file since 530 was 481, checked in by katerina, 9 years ago
Enhancements and fixes for tickets #374, #375, #376, #377, #378, and #379.
File size: 27.6 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	#include "sh_gpg.h"
63
64	static struct {
65	char conf_id[SH_MINIBUF+1];
66	char conf_fp[SH_MINIBUF+1];
67	char data_id[SH_MINIBUF+1];
68	char data_fp[SH_MINIBUF+1];
69	} gp;
70
71	typedef struct {
72	pid_t pid;
73	FILE * pipe;
74	} sh_gpg_popen_t;
75
76	#define SH_GPG_OK 0
77	#define SH_GPG_BAD 1
78	#define SH_GPG_BADSIGN 2
79
80	/* replace #if 0 by #if 1 and set an appropriate path in front of '/pdbg.'
81	* for debugging
82	*/
83	#if 0
84	#define PDGBFILE "/pdbg."
85	#endif
86
87	#if defined(PDGBFILE)
88	FILE * pdbg;
89	FILE * pdbgc;
90	#define PDBG_OPEN pdbg = fopen(PDGBFILE"main", "a")
91	#define PDBG_CLOSE sl_fclose (FIL__, __LINE__, pdbg)
92	#define PDBG(arg) fprintf(pdbg, "PDBG: step %d\n", arg); fflush(pdbg)
93	#define PDBG_D(arg) fprintf(pdbg, "PDBG: %d\n", arg); fflush(pdbg)
94	#define PDBG_S(arg) fprintf(pdbg, "PDBG: %s\n", arg); fflush(pdbg)
95
96	#define PDBGC_OPEN pdbgc = fopen(PDGBFILE"child", "a")
97	#define PDBGC_CLOSE sl_fclose (FIL__, __LINE__, pdbgc)
98	#define PDBGC(arg) fprintf(pdbgc, "PDBG: step %d\n", arg); fflush(pdbgc)
99	#define PDBGC_D(arg) fprintf(pdbgc, "PDBG: %d\n", arg); fflush(pdbgc)
100	#define PDBGC_S(arg) fprintf(pdbgc, "PDBG: %s\n", arg); fflush(pdbgc)
101	#else
102	#define PDBG_OPEN
103	#define PDBG_CLOSE
104	#define PDBG(arg)
105	#define PDBG_D(arg)
106	#define PDBG_S(arg)
107	#define PDBGC_OPEN
108	#define PDBGC_CLOSE
109	#define PDBGC(arg)
110	#define PDBGC_D(arg)
111	#define PDBGC_S(arg)
112	#endif
113
114	#undef FIL__
115	#define FIL__ _("sh_gpg.c")
116
117	#ifdef GPG_HASH
118
119	static int sh_gpg_checksum (SL_TICKET checkfd, int flag)
120	{
121	char * test_gpg;
122	char * test_ptr1 = NULL;
123	char * test_ptr2 = NULL;
124	char wstrip1[128];
125	char wstrip2[128];
126	int i, k;
127	#include "sh_gpg_chksum.h"
128
129	SL_ENTER(_("sh_gpg_checksum"));
130
131	test_gpg = sh_tiger_hash_gpg (DEFAULT_GPG_PATH, checkfd, TIGER_NOLIM);
132
133	test_ptr1 = strchr(GPG_HASH, ':');
134	if (test_gpg != NULL)
135	test_ptr2 = strchr(test_gpg, ':');
136
137	if (test_ptr2 != NULL)
138	test_ptr2 += 2;
139	else
140	test_ptr2 = test_gpg;
141	if (test_ptr1 != NULL)
142	test_ptr1 += 2;
143	else
144	test_ptr1 = GPG_HASH;
145
146	/* Tue Jun 24 23:11:54 CEST 2003 (1.7.9) -- strip whitespace
147	*/
148	k = 0;
149	for (i = 0; i < 127; ++i)
150	{
151	if (test_ptr1[i] == '\0')
152	break;
153	if (test_ptr1[i] != ' ')
154	{
155	wstrip1[k] = test_ptr1[i];
156	++k;
157	}
158	}
159	wstrip1[k] = '\0';
160
161	for(i = 0; i < KEY_LEN; ++i)
162	{
163	if (gpgchk[i] != wstrip1[i])
164	{
165	sh_error_handle(SH_ERR_SEVERE, FIL__, __LINE__, 0, MSG_E_GPG_CHK,
166	gpgchk, wstrip1);
167	break;
168	}
169	}
170
171	k = 0;
172	if (test_ptr2)
173	{
174	for (i = 0; i < 127; ++i)
175	{
176	if (test_ptr2[i] == '\0')
177	break;
178	if (test_ptr2[i] != ' ')
179	{
180	wstrip2[k] = test_ptr2[i];
181	++k;
182	}
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
252	char cc0[2] = "-";
253	char cc3[32];
254	char cc4[SH_PATHBUF+32];
255	char cc5[32];
256
257
258	char * arg[9];
259
260	#if defined(HAVE_GPG_CHECKSUM)
261	SL_TICKET checkfd = -1;
262	int myrand;
263	int i;
264	#if defined(__linux__)
265	int get_the_fd(SL_TICKET);
266	char pname[128];
267	int pfd;
268	int val_return;
269	#endif
270	#endif
271
272	SL_ENTER(_("sh_gpg_popen"));
273
274	/* -- GnuPG -- */
275	sl_strlcpy (path, DEFAULT_GPG_PATH, 256);
276	sl_strlcpy (cc1, _("--status-fd"), 32);
277	sl_strlcpy (cc2, _("--verify"), 32);
278	sl_strlcpy (cc3, _("--homedir"), 32);
279	/* sl_strlcpy (cc4, sh.effective.home, SH_PATHBUF+32); */
280	sl_strlcpy (cc4, homedir, SH_PATHBUF+32);
281	sl_strlcat (cc4, _("/.gnupg"), SH_PATHBUF+32);
282	sl_strlcpy (cc5, _("--no-tty"), 32);
283
284	/* fprintf(stderr, "YULE: homedir=%s\n", homedir); */
285
286	#if defined(SH_WITH_SERVER)
287	if (0 == sl_ret_euid()) /* privileges not dropped yet */
288	{
289	struct stat lbuf;
290	int status_stat = 0;
291	#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_GETPWNAM_R)
292	struct passwd pwd;
293	char * buffer = SH_ALLOC(SH_PWBUF_SIZE);
294	struct passwd * tempres;
295	sh_getpwnam_r(DEFAULT_IDENT, &pwd, buffer, SH_PWBUF_SIZE, &tempres);
296	#else
297	struct passwd * tempres = sh_getpwnam(DEFAULT_IDENT);
298	#endif
299
300	if (!tempres)
301	{
302	dlog(1, FIL__, __LINE__,
303	_("User %s does not exist. Please add the user to your system.\n"),
304	DEFAULT_IDENT);
305	status_stat = -1;
306	}
307	if (!tempres->pw_dir \|\| tempres->pw_dir[0] == '\0')
308	{
309	dlog(1, FIL__, __LINE__,
310	_("User %s does not have a home directory.\nPlease add the home directory for this user to your system.\n"),
311	DEFAULT_IDENT);
312	status_stat = -2;
313	}
314	if (status_stat == 0)
315	{
316	sl_strlcpy (cc4, tempres->pw_dir, SH_PATHBUF+32);
317	sl_strlcat (cc4, _("/.gnupg"), SH_PATHBUF+32);
318	status_stat = retry_lstat(FIL__, __LINE__, cc4, &lbuf);
319	if (status_stat == -1)
320	{
321	dlog(1, FIL__, __LINE__,
322	_("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"),
323	cc4, DEFAULT_IDENT);
324	status_stat = -3;
325	}
326	}
327	if (status_stat == 0 && lbuf.st_uid != tempres->pw_uid)
328	{
329	dlog(1, FIL__, __LINE__,
330	_("Gnupg directory %s\nis not owned by user %s.\n"),
331	cc4, DEFAULT_IDENT);
332	status_stat = -4;
333	}
334	if (status_stat == 0)
335	{
336	sl_strlcat (cc4, _("/pubring.gpg"), SH_PATHBUF+32);
337	status_stat = retry_lstat(FIL__, __LINE__, cc4, &lbuf);
338	if (status_stat == -1)
339	{
340	dlog(1, FIL__, __LINE__,
341	_("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"),
342	cc4, DEFAULT_IDENT);
343	status_stat = -5;
344	}
345	}
346	if (status_stat == 0 && lbuf.st_uid != tempres->pw_uid)
347	{
348	dlog(1, FIL__, __LINE__,
349	_("Gnupg public keyring %s\nis not owned by user %s.\n"),
350	cc4, DEFAULT_IDENT);
351	status_stat = -6;
352	}
353	if (status_stat != 0)
354	{
355	sh_error_handle((-1), FIL__, __LINE__, status_stat, MSG_EXIT_ABORT1,
356	sh.prg_name);
357	aud_exit (FIL__, __LINE__, EXIT_FAILURE);
358	}
359	sl_strlcpy (cc4, tempres->pw_dir, SH_PATHBUF+32);
360	sl_strlcat (cc4, _("/.gnupg"), SH_PATHBUF+32);
361	#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && defined(HAVE_GETPWNAM_R)
362	SH_FREE(buffer);
363	#endif
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
382	/* use homedir of effective user
383	*/
384	len = sl_strlen(sh.effective.home) + 6;
385	envp[0] = calloc(1, len); /* free() ok */
386	if (envp[0] != NULL)
387	sl_snprintf (envp[0], len, _("HOME=%s"), sh.effective.home);
388	envp[1] = NULL;
389
390	/* Create the pipe
391	*/
392	if (aud_pipe(FIL__, __LINE__, pipedes) < 0)
393	{
394	if (envp[0] != NULL)
395	free(envp[0]);
396	SL_RETURN( (NULL), _("sh_gpg_popen"));
397	}
398
399	fflush (NULL);
400
401	source->pid = aud_fork(FIL__, __LINE__);
402
403	/* Failure
404	*/
405	if (source->pid == (pid_t) - 1)
406	{
407	sl_close_fd(FIL__, __LINE__, pipedes[0]);
408	sl_close_fd(FIL__, __LINE__, pipedes[1]);
409	if (envp[0] != NULL)
410	free(envp[0]);
411	SL_RETURN( (NULL), _("sh_gpg_popen"));
412	}
413
414	if (source->pid == (pid_t) 0)
415	{
416
417	/* child - make read side of the pipe stdout
418	*/
419	if (retry_aud_dup2(FIL__, __LINE__,
420	pipedes[STDOUT_FILENO], STDOUT_FILENO) < 0)
421	{
422	TPT(((0), FIL__, __LINE__, _("msg=<dup2 on pipe failed>\n")));
423	dlog(1, FIL__, __LINE__, _("Internal error: dup2 failed\n"));
424	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
425	}
426
427	/* close the pipe descriptors
428	*/
429	sl_close_fd (FIL__, __LINE__, pipedes[STDIN_FILENO]);
430	sl_close_fd (FIL__, __LINE__, pipedes[STDOUT_FILENO]);
431
432	if (retry_aud_dup2(FIL__, __LINE__, fd, STDIN_FILENO) < 0)
433	{
434	TPT(((0), FIL__, __LINE__, _("msg=<dup2 on fd failed>\n")));
435	dlog(1, FIL__, __LINE__, _("Internal error: dup2 failed\n"));
436	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
437	}
438
439	/* don't leak file descriptors
440	*/
441	sh_unix_closeall (3, -1, S_TRUE); /* in child process */
442
443	if (flag_err_debug != S_TRUE)
444	{
445	if (NULL == freopen(_("/dev/null"), "r+", stderr))
446	{
447	dlog(1, FIL__, __LINE__, _("Internal error: freopen failed\n"));
448	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
449	}
450	}
451
452
453	/* We should become privileged if SUID,
454	* to be able to read the keyring.
455	* We have checked that gpg is OK,
456	* AND that only a trusted user could overwrite
457	* gpg.
458	*/
459	memset (skey, '\0', sizeof(sh_key_t));
460	aud_setuid(FIL__, __LINE__, geteuid());
461
462	PDBGC_OPEN;
463	PDBGC_D((int)getuid());
464	PDBGC_D((int)geteuid());
465
466	{
467	int i = 0;
468	while (arg[i] != NULL)
469	{
470	PDBGC_S(arg[i]);
471	++i;
472	}
473	}
474	PDBGC_CLOSE;
475
476	/* exec the program */
477
478	#if defined(__linux__) && defined(HAVE_GPG_CHECKSUM)
479	/*
480	* -- emulate an fexecve with checksum testing
481	*/
482	checkfd = sl_open_read(FIL__, __LINE__, DEFAULT_GPG_PATH, SL_NOPRIV);
483
484	if (0 != sh_gpg_checksum(checkfd, 0))
485	{
486	sl_close(checkfd);
487	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
488	}
489
490	pfd = get_the_fd(checkfd);
491	do {
492	val_return = dup (pfd);
493	} while (val_return < 0 && errno == EINTR);
494	pfd = val_return;
495	sl_close(checkfd);
496	/* checkfd = -1; // never read */
497
498	sl_snprintf(pname, sizeof(pname), _("/proc/self/fd/%d"), pfd);
499	if (0 == access(pname, R_OK\|X_OK)) /* flawfinder: ignore */
500
501	{
502	fcntl (pfd, F_SETFD, FD_CLOEXEC);
503	retry_aud_execve (FIL__, __LINE__, pname, arg, envp);
504
505	dlog(1, FIL__, __LINE__, _("Unexpected error: execve %s failed\n"),
506	pname);
507	/* failed
508	*/
509	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
510	}
511
512	/* procfs not working, go ahead
513	*/
514	#endif
515
516	#if defined(HAVE_GPG_CHECKSUM)
517	/* This is an incredibly ugly kludge to prevent an attacker
518	* from knowing when it is safe to slip in a fake executable
519	* between the integrity check and the execve
520	*/
521	myrand = (int) taus_get ();
522
523	myrand = (myrand < 0) ? (-myrand) : myrand;
524	myrand = (myrand % 32) + 2;
525
526	for (i = 0; i < myrand; ++i)
527	{
528	checkfd = sl_open_fastread(FIL__, __LINE__,
529	DEFAULT_GPG_PATH, SL_NOPRIV);
530
531	if (0 != sh_gpg_checksum(checkfd, 0)) {
532	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
533	}
534	sl_close(checkfd);
535	}
536	#endif
537
538	retry_aud_execve (FIL__, __LINE__, DEFAULT_GPG_PATH, arg, envp);
539	dlog(1, FIL__, __LINE__, _("Unexpected error: execve %s failed\n"),
540	DEFAULT_GPG_PATH);
541
542	/* failed
543	*/
544	TPT(((0), FIL__, __LINE__, _("msg=<execve failed>\n")));
545	dlog(1, FIL__, __LINE__, _("Unexpected error: execve failed\n"));
546	aud__exit(FIL__, __LINE__, EXIT_FAILURE);
547	}
548
549	/* parent
550	*/
551
552	if (envp[0] != NULL)
553	free(envp[0]);
554
555	sl_close_fd (FIL__, __LINE__, pipedes[STDOUT_FILENO]);
556	retry_fcntl (FIL__, __LINE__, pipedes[STDIN_FILENO], F_SETFD, FD_CLOEXEC);
557	retry_fcntl (FIL__, __LINE__, pipedes[STDIN_FILENO], F_SETFL, O_NONBLOCK);
558
559	outf = fdopen (pipedes[STDIN_FILENO], "r");
560
561	if (outf == NULL)
562	{
563	aud_kill (FIL__, __LINE__, source->pid, SIGKILL);
564	sl_close_fd (FIL__, __LINE__, pipedes[STDOUT_FILENO]);
565	waitpid (source->pid, NULL, 0);
566	source->pid = 0;
567	SL_RETURN( (NULL), _("sh_gpg_popen"));
568	}
569
570	SL_RETURN( (outf), _("sh_gpg_popen"));
571	}
572
573
574	static int sh_gpg_pclose (sh_gpg_popen_t *source)
575	{
576	int status = 0;
577
578	SL_ENTER(_("sh_gpg_pclose"));
579
580	status = sl_fclose(FIL__, __LINE__, source->pipe);
581	if (status)
582	SL_RETURN( (-1), _("sh_gpg_pclose"));
583
584	if (waitpid(source->pid, NULL, 0) != source->pid)
585	status = -1;
586
587	source->pipe = NULL;
588	source->pid = 0;
589	SL_RETURN( (status), _("sh_gpg_pclose"));
590	}
591
592	static
593	int sh_gpg_check_file_sign(int fd, char * sign_id, char * sign_fp,
594	char * homedir, int whichfile)
595	{
596	struct stat buf;
597	char line[256];
598	sh_gpg_popen_t source;
599	int have_id = BAD, have_fp = BAD, status = 0;
600
601	#ifdef HAVE_GPG_CHECKSUM
602	SL_TICKET checkfd;
603	#endif
604
605	SL_ENTER(_("sh_gpg_check_file_sign"));
606
607	/* check whether GnuPG exists and has the correct checksum
608	*/
609	TPT(((0), FIL__, __LINE__, _("msg=<Check signature>\n")));
610	TPT(((0), FIL__, __LINE__, _("msg=<gpg is %s>\n"), DEFAULT_GPG_PATH));
611
612	if (0 != retry_lstat(FIL__, __LINE__, DEFAULT_GPG_PATH, &buf))
613	{
614	char errbuf[SH_ERRBUF_SIZE];
615
616	status = errno;
617	sh_error_handle(SH_ERR_ERR, FIL__, __LINE__, status, MSG_ERR_LSTAT,
618	sh_error_message(status, errbuf, sizeof(errbuf)), DEFAULT_GPG_PATH);
619	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
620	}
621
622	if (0 != tf_trust_check (DEFAULT_GPG_PATH, SL_YESPRIV))
623	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
624
625	#ifdef HAVE_GPG_CHECKSUM
626	checkfd = sl_open_read(FIL__, __LINE__, DEFAULT_GPG_PATH, SL_YESPRIV);
627
628	if (0 != sh_gpg_checksum(checkfd, 1))
629	{
630	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
631	_("Checksum mismatch"),
632	_("gpg_check_file_sign"));
633	sl_close(checkfd);
634	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
635	}
636	sl_close(checkfd);
637	#endif
638
639	TPT(((0), FIL__, __LINE__, _("msg=<Open pipe to check signature>\n")));
640
641	fflush(NULL);
642
643	source.pipe = sh_gpg_popen ( &source, fd, 0, NULL, homedir );
644
645	if (NULL == source.pipe)
646	{
647	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
648	_("Could not open pipe"),
649	_("gpg_check_file_sign"));
650	SL_RETURN( SH_GPG_BAD, _("sh_gpg_check_file_sign"));
651	}
652
653	TPT(((0), FIL__, __LINE__, _("msg=<Open pipe success>\n")));
654
655	xagain:
656
657	errno = 0;
658
659	while (NULL != fgets(line, sizeof(line), source.pipe))
660	{
661
662	TPT(((0), FIL__, __LINE__, _("msg=<gpg out: %s>\n"), line));
663	if (line[strlen(line)-1] == '\n')
664	line[strlen(line)-1] = ' ';
665	sh_error_handle(SH_ERR_ALL, FIL__, __LINE__, 0, MSG_E_SUBGEN,
666	line,
667	_("gpg_check_file_sign"));
668
669	if (sl_strlen(line) < 18)
670	continue;
671
672	/* Sun May 27 18:40:05 CEST 2001
673	*/
674	if (0 == sl_strncmp(_("BADSIG"), &line[9], 6) \|\|
675	0 == sl_strncmp(_("ERRSIG"), &line[9], 6) \|\|
676	0 == sl_strncmp(_("NO_PUBKEY"), &line[9], 6) \|\|
677	0 == sl_strncmp(_("NODATA"), &line[9], 6) \|\|
678	0 == sl_strncmp(_("SIGEXPIRED"), &line[9], 6))
679	{
680	if (0 == sl_strncmp(_("BADSIG"), &line[9], 6)) {
681	dlog(1, FIL__, __LINE__,
682	_("%s file is signed, but the signature is invalid."),
683	((whichfile == 1) ? _("Configuration") : _("Database")));
684	}
685	else if (0 == sl_strncmp(_("NO_PUBKEY"), &line[9], 6)) {
686	dlog(1, FIL__, __LINE__,
687	_("%s file is signed, but the public key to verify the signature is not in my keyring %s/.gnupg/pubring.asc."),
688	((whichfile == 1) ? _("Configuration") : _("Database")),
689	homedir);
690	}
691	else if (0 == sl_strncmp(_("ERRSIG"), &line[9], 6)) {
692	dlog(1, FIL__, __LINE__,
693	_("%s file is signed, but the public key to verify the signature is not in my keyring %s/.gnupg/pubring.asc."),
694	((whichfile == 1) ? _("Configuration") : _("Database")),
695	homedir);
696	}
697	else if (0 == sl_strncmp(_("SIGEXPIRED"), &line[9], 6)) {
698	dlog(1, FIL__, __LINE__,
699	_("%s file is signed, but the public key to verify the signature has expired."),
700	((whichfile == 1) ? _("Configuration") : _("Database")));
701	}
702	else if (0 == sl_strncmp(_("NODATA"), &line[9], 6)) {
703	dlog(1, FIL__, __LINE__,
704	_("%s file is not signed."),
705	((whichfile == 1) ? _("Configuration") : _("Database")));
706	}
707
708	have_fp = BAD; have_id = BAD;
709	break;
710	}
711	if (0 == sl_strncmp(_("GOODSIG"), &line[9], 7))
712	{
713	sl_strlcpy (sign_id, &line[25], SH_MINIBUF+1);
714	if (sign_id)
715	sign_id[sl_strlen(sign_id)-1] = '\0'; /* remove trailing '"' */
716	have_id = GOOD;
717	}
718	if (0 == sl_strncmp(_("VALIDSIG"), &line[9], 8))
719	{
720	strncpy (sign_fp, &line[18], 40);
721	sign_fp[40] = '\0';
722	have_fp = GOOD;
723	}
724	}
725
726	if (ferror(source.pipe) && errno == EAGAIN)
727	{
728	/* sleep 10 ms to avoid starving the gpg child writing to the pipe */
729	retry_msleep(0,10);
730	clearerr(source.pipe);
731	goto xagain;
732	}
733
734	sh_gpg_pclose (&source);
735
736	TPT(((0), FIL__, __LINE__, _("msg=<Close pipe>\n")));
737
738	if (have_id == GOOD)
739	{
740	TPT(((0), FIL__, __LINE__, _("msg=<Got signator ID>\n")));
741	}
742	if (have_fp == GOOD)
743	{
744	TPT(((0), FIL__, __LINE__, _("msg=<Got fingerprint>\n")));
745	}
746
747	if (have_id == GOOD && have_fp == GOOD)
748	SL_RETURN( SH_GPG_OK, _("sh_gpg_check_file_sign"));
749	else
750	{
751	if (have_id == BAD)
752	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
753	_("No good signature"),
754	_("gpg_check_file_sign"));
755	else
756	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
757	_("No fingerprint for key"),
758	_("gpg_check_file_sign"));
759	SL_RETURN( SH_GPG_BADSIGN, _("sh_gpg_check_file_sign"));
760	}
761	}
762
763	int get_the_fd(SL_TICKET file_1);
764
765	#if defined(HAVE_PTHREAD) && defined (_POSIX_THREAD_SAFE_FUNCTIONS) && \
766	defined(HAVE_GETPWNAM_R)
767	#define USE_GETPWNAM_R 1
768	#endif
769
770	int sh_gpg_check_sign (long file, int what)
771	{
772	int status = SH_GPG_BAD;
773	int fd = 0;
774
775	static int smsg = S_FALSE;
776	char * tmp;
777
778	char * sig_id;
779	char * sig_fp;
780
781	char * homedir = sh.effective.home;
782	#if defined(SH_WITH_SERVER)
783	struct passwd * tempres;
784	#if defined(USE_GETPWNAM_R)
785	struct passwd pwd;
786	char * buffer = SH_ALLOC(SH_PWBUF_SIZE);
787	#endif
788	#endif
789
790	#ifdef USE_FINGERPRINT
791	#include "sh_gpg_fp.h"
792	#endif
793
794	SL_ENTER(_("sh_gpg_check_sign"));
795
796
797	if (what == SIG_CONF)
798	fd = get_the_fd(file);
799	if (what == SIG_DATA)
800	fd = get_the_fd(file);
801
802
803	if (fd < 0)
804	{
805	TPT(((0), FIL__, __LINE__, _("msg=<GPG_CHECK: FD = %d>\n"), fd));
806	dlog(1, FIL__, __LINE__,
807	_("This looks like an unexpected internal error.\n"));
808	#if defined(SH_WITH_SERVER) && defined(USE_GETPWNAM_R)
809	SH_FREE(buffer);
810	#endif
811	SL_RETURN( (-1), _("sh_gpg_check_sign"));
812	}
813
814	#if defined(SH_WITH_SERVER)
815	#if defined(USE_GETPWNAM_R)
816	sh_getpwnam_r(DEFAULT_IDENT, &pwd, buffer, SH_PWBUF_SIZE, &tempres);
817	#else
818	tempres = sh_getpwnam(DEFAULT_IDENT);
819	#endif
820	if ((tempres != NULL) && (0 == sl_ret_euid()))
821	{
822	/* privileges not dropped yet*/
823	homedir = tempres->pw_dir;
824	}
825	#endif
826
827	if (what == SIG_CONF)
828	{
829	TPT(((0), FIL__, __LINE__, _("msg=<GPG_CHECK: FD = %d>\n"), fd));
830	status = sh_gpg_check_file_sign(fd, gp.conf_id, gp.conf_fp, homedir, 1);
831	TPT(((0), FIL__, __LINE__, _("msg=<CONF SIGUSR: \|%s\|>\n"), gp.conf_id));
832	TPT(((0), FIL__, __LINE__, _("msg=<CONF SIGFP: \|%s\|>\n"), gp.conf_fp));
833	sig_id = gp.conf_id; sig_fp = gp.conf_fp;
834	}
835
836	if (what == SIG_DATA)
837	{
838	TPT(((0), FIL__, __LINE__, _("msg=<GPG_CHECK: FD = %d>\n"), fd));
839	status = sh_gpg_check_file_sign(fd, gp.data_id, gp.data_fp, homedir, 2);
840	TPT(((0), FIL__, __LINE__, _("msg=<DATA SIGUSR: \|%s\|>\n"), gp.data_id));
841	TPT(((0), FIL__, __LINE__, _("msg=<DATA SIGFP: \|%s\|>\n"), gp.data_fp));
842	sig_id = gp.data_id; sig_fp = gp.data_fp;
843	}
844
845	if (SH_GPG_OK == status)
846	{
847	#ifdef USE_FINGERPRINT
848	if ((sl_strcmp(SH_GPG_FP, sig_fp) == 0))
849	{
850	int i;
851
852	for(i = 0; i < (int) sl_strlen(sig_fp); ++i) {
853	if (gpgfp[i] != sig_fp[i]) {
854	sh_error_handle(SH_ERR_SEVERE, FIL__, __LINE__, 0,
855	MSG_E_GPG_FP, gpgfp, sig_fp);
856	break; }
857	}
858
859	if (smsg == S_FALSE) {
860	tmp = sh_util_safe_name(sig_id);
861	sh_gpg_fill_startup (__LINE__, sh.prg_name, sh.real.uid,
862	(sh.flag.hidefile == S_TRUE) ?
863	_("(hidden)") : file_path('C', 'R'),
864	tmp,
865	sig_fp);
866	SH_FREE(tmp); }
867	smsg = S_TRUE;
868
869	#if defined(SH_WITH_SERVER) && defined(USE_GETPWNAM_R)
870	SH_FREE(buffer);
871	#endif
872	SL_RETURN(0, _("sh_gpg_check_sign"));
873	}
874	else
875	{
876	/* fp mismatch */
877	dlog(1, FIL__, __LINE__,
878	_("The fingerprint of the signing key: %s\ndoes not match the compiled-in fingerprint: %s.\nTherefore the signature could not be verified.\n"),
879	sig_fp, SH_GPG_FP);
880	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
881	_("Fingerprint mismatch"), _("gpg_check_sign"));
882	status = SH_GPG_BADSIGN;
883	}
884	#else /* ifdef USE_FINGERPRINT */
885	if (smsg == S_FALSE)
886	{
887	tmp = sh_util_safe_name(sig_id);
888	sh_gpg_fill_startup (__LINE__,
889	sh.prg_name, sh.real.uid,
890	(sh.flag.hidefile == S_TRUE) ?
891	_("(hidden)") : file_path('C', 'R'),
892	tmp, sig_fp);
893	SH_FREE(tmp);
894	}
895	smsg = S_TRUE;
896
897	#if defined(SH_WITH_SERVER) && defined(USE_GETPWNAM_R)
898	SH_FREE(buffer);
899	#endif
900
901	SL_RETURN(0, _("sh_gpg_check_sign"));
902	#endif /* !ifdef USE_FINGERPRINT */
903	}
904
905	if (status != SH_GPG_OK)
906	{
907	uid_t e_uid = sl_ret_euid();
908	char * e_home = sh.effective.home;
909
910	#if defined(SH_WITH_SERVER)
911	#if defined(USE_GETPWNAM_R)
912	struct passwd e_pwd;
913	char * e_buffer = SH_ALLOC(SH_PWBUF_SIZE);
914	struct passwd * e_tempres;
915	sh_getpwnam_r(DEFAULT_IDENT, &e_pwd, e_buffer, SH_PWBUF_SIZE, &e_tempres);
916	#else
917	struct passwd * e_tempres = sh_getpwnam(DEFAULT_IDENT);
918	#endif
919
920	if ((e_tempres != NULL) && (0 == sl_ret_euid()))
921	{
922	/* privileges not dropped yet */
923	e_uid = e_tempres->pw_uid;
924	e_home = e_tempres->pw_dir;
925	}
926	#endif
927	dlog(1, FIL__, __LINE__,
928	_("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"),
929	DEFAULT_GPG_PATH,
930	(int) e_uid, e_home);
931
932	#if defined(SH_WITH_SERVER) && defined(USE_GETPWNAM_R)
933	SH_FREE(e_buffer);
934	#endif
935	}
936
937	TPT(((0), FIL__, __LINE__, _("msg=<Status = %d>\n"), status));
938
939	return (-1); /* make compiler happy */
940	}
941
942	#define FGETS_BUF 16384
943
944	SL_TICKET sh_gpg_extract_signed(SL_TICKET fd)
945	{
946	FILE * fin_cp = NULL;
947	char * buf = NULL;
948	int bufc;
949	int flag_pgp = S_FALSE;
950	int flag_nohead = S_FALSE;
951	SL_TICKET fdTmp = (-1);
952	SL_TICKET open_tmp (void);
953
954	/* extract the data and copy to temporary file
955	*/
956	fdTmp = open_tmp();
957	if (SL_ISERROR(fdTmp))
958	{
959	dlog(1, FIL__, __LINE__, _("Error opening temporary file.\n"));
960	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
961	_("Error opening temporary file."),
962	_("sh_gpg_extract_signed"));
963	return -1;
964	}
965
966	fin_cp = fdopen(dup(get_the_fd(fd)), "rb");
967	buf = SH_ALLOC(FGETS_BUF);
968
969	while (NULL != fgets(buf, FGETS_BUF, fin_cp))
970	{
971	bufc = 0;
972	while (bufc < FGETS_BUF) {
973	if (buf[bufc] == '\n') { ++bufc; break; }
974	++bufc;
975	}
976
977	if (flag_pgp == S_FALSE &&
978	(0 == sl_strcmp(buf, _("-----BEGIN PGP SIGNED MESSAGE-----\n"))\|\|
979	0 == sl_strcmp(buf, _("-----BEGIN PGP MESSAGE-----\n")))
980	)
981	{
982	flag_pgp = S_TRUE;
983	sl_write(fdTmp, buf, bufc);
984	continue;
985	}
986
987	if (flag_pgp == S_TRUE && flag_nohead == S_FALSE)
988	{
989	if (buf[0] == '\n')
990	{
991	flag_nohead = S_TRUE;
992	sl_write(fdTmp, buf, 1);
993	continue;
994	}
995	else if (0 == sl_strncmp(buf, _("Hash:"), 5) \|\|
996	0 == sl_strncmp(buf, _("NotDashEscaped:"), 15))
997	{
998	sl_write(fdTmp, buf, bufc);
999	continue;
1000	}
1001	else
1002	continue;
1003	}
1004
1005	if (flag_pgp == S_TRUE && buf[0] == '\n')
1006	{
1007	sl_write(fdTmp, buf, 1);
1008	}
1009	else if (flag_pgp == S_TRUE)
1010	{
1011	/* sl_write_line(fdTmp, buf, bufc); */
1012	sl_write(fdTmp, buf, bufc);
1013	}
1014
1015	if (flag_pgp == S_TRUE &&
1016	0 == sl_strcmp(buf, _("-----END PGP SIGNATURE-----\n")))
1017	break;
1018	}
1019	SH_FREE(buf);
1020	sl_fclose(FIL__, __LINE__, fin_cp); /* fin_cp = fdopen(dup(), "rb"); */
1021	sl_rewind (fdTmp);
1022
1023	return fdTmp;
1024	}
1025
1026	/* #ifdef WITH_GPG */
1027	#endif
1028
1029
1030
1031
1032
1033
1034
1035

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