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- Committer: Teddy Hogeborn
- Date: 2014-06-22 02:19:30 UTC
- mto: (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 317.
- Revision ID: teddy@recompile.se-20140622021930-icl7h4cm97blhjml
mandos-keygen: Generate "checker" option to use SSH fingerprints.
To turn this off, use a new "--no-ssh" option to mandos-keygen.
* INSTALL (Mandos Server, Mandos Client): Document new suggested
installation of SSH.
* Makefile (confdir/clients.conf): Use new "--no-ssh" option to
"mandos-keygen".
* debian/control (mandos/Depends): Changed to "fping | ssh-client".
(mandos-client/Recommends): New; set to "ssh".
* intro.xml (FREQUENTLY ASKED QUESTIONS): Rename and rewrite section
called "Faking ping
replies?" to address new
default behavior.
* mandos-clients.conf.xml (OPTIONS/checker): Briefly discuss new
behavior of
mandos-keygen.
* mandos-keygen: Bug fix: Suppress failure output of "shred" to remove
"sec*", since no such files may exist.
(password mode): Scan for SSH key fingerprints and output as new
"checker" and "ssh_fingerprint" options, unless new
"--no-ssh" option is given.
* mandos-keygen.xml (SYNOPSIS/--force): Bug fix: Document short form.
(OPTIONS/--no-ssh): New.
(SEE ALSO): Add reference "ssh-keyscan(1)".
* plugins.d/mandos-client.xml (SECURITY): Briefly mention the
possibility of using SSH key
fingerprints for checking.
To turn this off, use a new "--no-ssh" option to mandos-keygen.
* INSTALL (Mandos Server, Mandos Client): Document new suggested
installation of SSH.
* Makefile (confdir/clients.conf): Use new "--no-ssh" option to
"mandos-keygen".
* debian/control (mandos/Depends): Changed to "fping | ssh-client".
(mandos-client/Recommends): New; set to "ssh".
* intro.xml (FREQUENTLY ASKED QUESTIONS): Rename and rewrite section
called "Faking ping
replies?" to address new
default behavior.
* mandos-clients.conf.xml (OPTIONS/checker): Briefly discuss new
behavior of
mandos-keygen.
* mandos-keygen: Bug fix: Suppress failure output of "shred" to remove
"sec*", since no such files may exist.
(password mode): Scan for SSH key fingerprints and output as new
"checker" and "ssh_fingerprint" options, unless new
"--no-ssh" option is given.
* mandos-keygen.xml (SYNOPSIS/--force): Bug fix: Document short form.
(OPTIONS/--no-ssh): New.
(SEE ALSO): Add reference "ssh-keyscan(1)".
* plugins.d/mandos-client.xml (SECURITY): Briefly mention the
possibility of using SSH key
fingerprints for checking.
- files added:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 Björn Påhlsson
7
7
*
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
19
19
* along with this program. If not, see
20
20
* <http://www.gnu.org/licenses/>.
21
21
*
22
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
26
O_CLOEXEC, pipe2() */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
36
getgid() */
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS() */
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
40
WEXITSTATUS(), WTERMSIG(),
41
WCOREDUMP() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
43
43
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
readdir(), closedir(), dirfd() */
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
47
fcntl(), setuid(), setgid(),
48
F_GETFD, F_SETFD, FD_CLOEXEC,
49
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
51
execv(), write(), read(),
52
close() */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
53
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
56
57
#include <errno.h> /* errno */
57
58
#include <argp.h> /* struct argp_option, struct
58
59
argp_state, struct argp,
62
63
#include <signal.h> /* struct sigaction, sigemptyset(),
63
64
sigaddset(), sigaction(),
64
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill() */
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
66
68
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
68
75
69
76
#define BUFFER_SIZE 256
70
77
72
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
80
74
81
const char *argp_program_version = "plugin-runner " VERSION;
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
83
77
84
typedef struct plugin{
78
85
char *name; /* can be NULL or any plugin name */
81
88
char **environ;
82
89
int envc;
83
90
bool disabled;
84
91
85
92
/* Variables used for running processes*/
86
93
pid_t pid;
87
94
int fd;
98
105
99
106
/* Gets an existing plugin based on name,
100
107
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
101
109
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
110
/* Check for existing plugin with that name */
103
111
for(plugin *p = plugin_list; p != NULL; p = p->next){
104
112
if((p->name == name)
105
113
or (p->name and name and (strcmp(p->name, name) == 0))){
107
115
}
108
116
}
109
117
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
118
plugin *new_plugin = NULL;
119
do {
120
new_plugin = malloc(sizeof(plugin));
121
} while(new_plugin == NULL and errno == EINTR);
111
122
if(new_plugin == NULL){
112
123
return NULL;
113
124
}
114
125
char *copy_name = NULL;
115
126
if(name != NULL){
116
copy_name = strdup(name);
127
do {
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
117
130
if(copy_name == NULL){
131
int e = errno;
118
132
free(new_plugin);
133
errno = e;
119
134
return NULL;
120
135
}
121
136
}
125
140
.disabled = false,
126
141
.next = plugin_list };
127
142
128
new_plugin->argv = malloc(sizeof(char *) * 2);
143
do {
144
new_plugin->argv = malloc(sizeof(char *) * 2);
145
} while(new_plugin->argv == NULL and errno == EINTR);
129
146
if(new_plugin->argv == NULL){
147
int e = errno;
130
148
free(copy_name);
131
149
free(new_plugin);
150
errno = e;
132
151
return NULL;
133
152
}
134
153
new_plugin->argv[0] = copy_name;
135
154
new_plugin->argv[1] = NULL;
136
155
137
new_plugin->environ = malloc(sizeof(char *));
156
do {
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
138
159
if(new_plugin->environ == NULL){
160
int e = errno;
139
161
free(copy_name);
140
162
free(new_plugin->argv);
141
163
free(new_plugin);
164
errno = e;
142
165
return NULL;
143
166
}
144
167
new_plugin->environ[0] = NULL;
149
172
}
150
173
151
174
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
152
176
static bool add_to_char_array(const char *new, char ***array,
153
177
int *len){
154
178
/* Resize the pointed-to array to hold one more pointer */
155
*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
179
char **new_array = NULL;
180
do {
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
157
184
/* Malloc check */
158
if(*array == NULL){
185
if(new_array == NULL){
159
186
return false;
160
187
}
188
*array = new_array;
161
189
/* Make a copy of the new string */
162
char *copy = strdup(new);
190
char *copy;
191
do {
192
copy = strdup(new);
193
} while(copy == NULL and errno == EINTR);
163
194
if(copy == NULL){
164
195
return false;
165
196
}
172
203
}
173
204
174
205
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
175
207
static bool add_argument(plugin *p, const char *arg){
176
208
if(p == NULL){
177
209
return false;
180
212
}
181
213
182
214
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
183
216
static bool add_environment(plugin *p, const char *def, bool replace){
184
217
if(p == NULL){
185
218
return false;
187
220
/* namelen = length of name of environment variable */
188
221
size_t namelen = (size_t)(strchrnul(def, '=') - def);
189
222
/* Search for this environment variable */
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
192
225
/* It already exists */
193
226
if(replace){
194
char *new = realloc(*e, strlen(def) + 1);
195
if(new == NULL){
227
char *new_envdef;
228
do {
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
196
232
return false;
197
233
}
198
*e = new;
199
strcpy(*e, def);
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
200
236
}
201
237
return true;
202
238
}
204
240
return add_to_char_array(def, &(p->environ), &(p->envc));
205
241
}
206
242
243
#ifndef O_CLOEXEC
207
244
/*
208
245
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
246
* Descriptor Flags".
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
211
248
*/
249
__attribute__((warn_unused_result))
212
250
static int set_cloexec_flag(int fd){
213
int ret = fcntl(fd, F_GETFD, 0);
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
252
/* If reading the flags failed, return error indication now. */
215
253
if(ret < 0){
216
254
return ret;
217
255
}
218
256
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
258
ret | FD_CLOEXEC));
220
259
}
260
#endif /* not O_CLOEXEC */
221
261
222
262
223
263
/* Mark processes as completed when they exit, and save their exit
237
277
/* No child processes */
238
278
break;
239
279
}
240
perror("waitpid");
280
error(0, errno, "waitpid");
241
281
}
242
282
243
283
/* A child exited, find it in process_list */
255
295
}
256
296
257
297
/* Prints out a password to stdout */
298
__attribute__((nonnull, warn_unused_result))
258
299
static bool print_out_password(const char *buffer, size_t length){
259
300
ssize_t ret;
260
301
for(size_t written = 0; written < length; written += (size_t)ret){
268
309
}
269
310
270
311
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
271
313
static void free_plugin(plugin *plugin_node){
272
314
273
315
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
279
321
}
280
322
free(plugin_node->environ);
281
323
free(plugin_node->buffer);
282
324
283
325
/* Removes the plugin from the singly-linked list */
284
326
if(plugin_node == plugin_list){
285
327
/* First one - simple */
307
349
char *plugindir = NULL;
308
350
char *argfile = NULL;
309
351
FILE *conffp;
310
size_t d_name_len;
311
DIR *dir = NULL;
312
struct dirent *dirst;
352
struct dirent **direntries = NULL;
313
353
struct stat st;
314
354
fd_set rfds_all;
315
int ret, numchars, maxfd = 0;
355
int ret, maxfd = 0;
316
356
ssize_t sret;
317
intmax_t tmpmax;
318
357
uid_t uid = 65534;
319
358
gid_t gid = 65534;
320
359
bool debug = false;
324
363
.sa_flags = SA_NOCLDSTOP };
325
364
char **custom_argv = NULL;
326
365
int custom_argc = 0;
366
int dir_fd = -1;
327
367
328
368
/* Establish a signal handler */
329
369
sigemptyset(&sigchld_action.sa_mask);
330
370
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
331
371
if(ret == -1){
332
perror("sigaddset");
333
exitstatus = EXIT_FAILURE;
372
error(0, errno, "sigaddset");
373
exitstatus = EX_OSERR;
334
374
goto fallback;
335
375
}
336
376
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
337
377
if(ret == -1){
338
perror("sigaction");
339
exitstatus = EXIT_FAILURE;
378
error(0, errno, "sigaction");
379
exitstatus = EX_OSERR;
340
380
goto fallback;
341
381
}
342
382
374
414
.doc = "Group ID the plugins will run as", .group = 3 },
375
415
{ .name = "debug", .key = 132,
376
416
.doc = "Debug mode", .group = 4 },
417
/*
418
* These reproduce what we would get without ARGP_NO_HELP
419
*/
420
{ .name = "help", .key = '?',
421
.doc = "Give this help list", .group = -1 },
422
{ .name = "usage", .key = -3,
423
.doc = "Give a short usage message", .group = -1 },
424
{ .name = "version", .key = 'V',
425
.doc = "Print program version", .group = -1 },
377
426
{ .name = NULL }
378
427
};
379
428
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
429
__attribute__((nonnull(3)))
430
error_t parse_opt(int key, char *arg, struct argp_state *state){
431
errno = 0;
382
432
switch(key){
433
char *tmp;
434
intmax_t tmp_id;
383
435
case 'g': /* --global-options */
384
if(arg != NULL){
385
char *p;
386
while((p = strsep(&arg, ",")) != NULL){
387
if(p[0] == '\0'){
388
continue;
389
}
390
if(not add_argument(getplugin(NULL), p)){
391
perror("add_argument");
392
return ARGP_ERR_UNKNOWN;
436
{
437
char *plugin_option;
438
while((plugin_option = strsep(&arg, ",")) != NULL){
439
if(not add_argument(getplugin(NULL), plugin_option)){
440
break;
393
441
}
394
442
}
443
errno = 0;
395
444
}
396
445
break;
397
446
case 'G': /* --global-env */
398
if(arg == NULL){
399
break;
400
}
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
447
if(add_environment(getplugin(NULL), arg, true)){
448
errno = 0;
403
449
}
404
450
break;
405
451
case 'o': /* --options-for */
406
if(arg != NULL){
407
char *p_name = strsep(&arg, ":");
408
if(p_name[0] == '\0' or arg == NULL){
409
break;
410
}
411
char *opt = strsep(&arg, ":");
412
if(opt[0] == '\0' or opt == NULL){
413
break;
414
}
415
char *p;
416
while((p = strsep(&opt, ",")) != NULL){
417
if(p[0] == '\0'){
418
continue;
419
}
420
if(not add_argument(getplugin(p_name), p)){
421
perror("add_argument");
422
return ARGP_ERR_UNKNOWN;
423
}
424
}
452
{
453
char *option_list = strchr(arg, ':');
454
if(option_list == NULL){
455
argp_error(state, "No colon in \"%s\"", arg);
456
errno = EINVAL;
457
break;
458
}
459
*option_list = '\0';
460
option_list++;
461
if(arg[0] == '\0'){
462
argp_error(state, "Empty plugin name");
463
errno = EINVAL;
464
break;
465
}
466
char *option;
467
while((option = strsep(&option_list, ",")) != NULL){
468
if(not add_argument(getplugin(arg), option)){
469
break;
470
}
471
}
472
errno = 0;
425
473
}
426
474
break;
427
475
case 'E': /* --env-for */
428
if(arg == NULL){
429
break;
430
}
431
476
{
432
477
char *envdef = strchr(arg, ':');
433
478
if(envdef == NULL){
479
argp_error(state, "No colon in \"%s\"", arg);
480
errno = EINVAL;
434
481
break;
435
482
}
436
483
*envdef = '\0';
437
if(not add_environment(getplugin(arg), envdef+1, true)){
438
perror("add_environment");
484
envdef++;
485
if(arg[0] == '\0'){
486
argp_error(state, "Empty plugin name");
487
errno = EINVAL;
488
break;
489
}
490
if(add_environment(getplugin(arg), envdef, true)){
491
errno = 0;
439
492
}
440
493
}
441
494
break;
442
495
case 'd': /* --disable */
443
if(arg != NULL){
496
{
444
497
plugin *p = getplugin(arg);
445
if(p == NULL){
446
return ARGP_ERR_UNKNOWN;
498
if(p != NULL){
499
p->disabled = true;
500
errno = 0;
447
501
}
448
p->disabled = true;
449
502
}
450
503
break;
451
504
case 'e': /* --enable */
452
if(arg != NULL){
505
{
453
506
plugin *p = getplugin(arg);
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
507
if(p != NULL){
508
p->disabled = false;
509
errno = 0;
456
510
}
457
p->disabled = false;
458
511
}
459
512
break;
460
513
case 128: /* --plugin-dir */
461
514
free(plugindir);
462
515
plugindir = strdup(arg);
463
if(plugindir == NULL){
464
perror("strdup");
465
}
516
if(plugindir != NULL){
517
errno = 0;
518
}
466
519
break;
467
520
case 129: /* --config-file */
468
521
/* This is already done by parse_opt_config_file() */
469
522
break;
470
523
case 130: /* --userid */
471
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
472
if(ret < 1 or tmpmax != (uid_t)tmpmax
473
or arg[numchars] != '\0'){
474
fprintf(stderr, "Bad user ID number: \"%s\", using %"
475
PRIdMAX "\n", arg, (intmax_t)uid);
476
} else {
477
uid = (uid_t)tmpmax;
524
tmp_id = strtoimax(arg, &tmp, 10);
525
if(errno != 0 or tmp == arg or *tmp != '\0'
526
or tmp_id != (uid_t)tmp_id){
527
argp_error(state, "Bad user ID number: \"%s\", using %"
528
PRIdMAX, arg, (intmax_t)uid);
529
break;
478
530
}
531
uid = (uid_t)tmp_id;
532
errno = 0;
479
533
break;
480
534
case 131: /* --groupid */
481
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
482
if(ret < 1 or tmpmax != (gid_t)tmpmax
483
or arg[numchars] != '\0'){
484
fprintf(stderr, "Bad group ID number: \"%s\", using %"
485
PRIdMAX "\n", arg, (intmax_t)gid);
486
} else {
487
gid = (gid_t)tmpmax;
535
tmp_id = strtoimax(arg, &tmp, 10);
536
if(errno != 0 or tmp == arg or *tmp != '\0'
537
or tmp_id != (gid_t)tmp_id){
538
argp_error(state, "Bad group ID number: \"%s\", using %"
539
PRIdMAX, arg, (intmax_t)gid);
540
break;
488
541
}
542
gid = (gid_t)tmp_id;
543
errno = 0;
489
544
break;
490
545
case 132: /* --debug */
491
546
debug = true;
492
547
break;
548
/*
549
* These reproduce what we would get without ARGP_NO_HELP
550
*/
551
case '?': /* --help */
552
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
553
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
554
case -3: /* --usage */
555
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
556
argp_state_help(state, state->out_stream,
557
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
558
case 'V': /* --version */
559
fprintf(state->out_stream, "%s\n", argp_program_version);
560
exit(EXIT_SUCCESS);
561
break;
493
562
/*
494
563
* When adding more options before this line, remember to also add a
495
564
* "case" to the "parse_opt_config_file" function below.
498
567
/* Cryptsetup always passes an argument, which is an empty
499
568
string if "none" was specified in /etc/crypttab. So if
500
569
argument was empty, we ignore it silently. */
501
if(arg[0] != '\0'){
502
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
570
if(arg[0] == '\0'){
571
break;
503
572
}
504
break;
505
case ARGP_KEY_END:
506
break;
507
573
default:
508
574
return ARGP_ERR_UNKNOWN;
509
575
}
510
return 0;
576
return errno; /* Set to 0 at start */
511
577
}
512
578
513
579
/* This option parser is the same as parse_opt() above, except it
515
581
error_t parse_opt_config_file(int key, char *arg,
516
582
__attribute__((unused))
517
583
struct argp_state *state){
584
errno = 0;
518
585
switch(key){
519
586
case 'g': /* --global-options */
520
587
case 'G': /* --global-env */
527
594
case 129: /* --config-file */
528
595
free(argfile);
529
596
argfile = strdup(arg);
530
if(argfile == NULL){
531
perror("strdup");
597
if(argfile != NULL){
598
errno = 0;
532
599
}
533
break;
600
break;
534
601
case 130: /* --userid */
535
602
case 131: /* --groupid */
536
603
case 132: /* --debug */
604
case '?': /* --help */
605
case -3: /* --usage */
606
case 'V': /* --version */
537
607
case ARGP_KEY_ARG:
538
case ARGP_KEY_END:
539
608
break;
540
609
default:
541
610
return ARGP_ERR_UNKNOWN;
542
611
}
543
return 0;
612
return errno;
544
613
}
545
614
546
615
struct argp argp = { .options = options,
550
619
551
620
/* Parse using parse_opt_config_file() in order to get the custom
552
621
config file location, if any. */
553
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
554
if(ret == ARGP_ERR_UNKNOWN){
555
fprintf(stderr, "Unknown error while parsing arguments\n");
556
exitstatus = EXIT_FAILURE;
622
ret = argp_parse(&argp, argc, argv,
623
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
624
NULL, NULL);
625
switch(ret){
626
case 0:
627
break;
628
case ENOMEM:
629
default:
630
errno = ret;
631
error(0, errno, "argp_parse");
632
exitstatus = EX_OSERR;
633
goto fallback;
634
case EINVAL:
635
exitstatus = EX_USAGE;
557
636
goto fallback;
558
637
}
559
638
565
644
conffp = fopen(AFILE, "r");
566
645
} else {
567
646
conffp = fopen(argfile, "r");
568
}
647
}
569
648
if(conffp != NULL){
570
649
char *org_line = NULL;
571
650
char *p, *arg, *new_arg, *line;
572
651
size_t size = 0;
573
652
const char whitespace_delims[] = " \r\t\f\v\n";
574
653
const char comment_delim[] = "#";
575
654
576
655
custom_argc = 1;
577
656
custom_argv = malloc(sizeof(char*) * 2);
578
657
if(custom_argv == NULL){
579
perror("malloc");
580
exitstatus = EXIT_FAILURE;
658
error(0, errno, "malloc");
659
exitstatus = EX_OSERR;
581
660
goto fallback;
582
661
}
583
662
custom_argv[0] = argv[0];
584
663
custom_argv[1] = NULL;
585
664
586
665
/* for each line in the config file, strip whitespace and ignore
587
666
commented text */
588
667
while(true){
590
669
if(sret == -1){
591
670
break;
592
671
}
593
672
594
673
line = org_line;
595
674
arg = strsep(&line, comment_delim);
596
675
while((p = strsep(&arg, whitespace_delims)) != NULL){
599
678
}
600
679
new_arg = strdup(p);
601
680
if(new_arg == NULL){
602
perror("strdup");
603
exitstatus = EXIT_FAILURE;
681
error(0, errno, "strdup");
682
exitstatus = EX_OSERR;
604
683
free(org_line);
605
684
goto fallback;
606
685
}
607
686
608
687
custom_argc += 1;
609
custom_argv = realloc(custom_argv, sizeof(char *)
610
* ((unsigned int) custom_argc + 1));
611
if(custom_argv == NULL){
612
perror("realloc");
613
exitstatus = EXIT_FAILURE;
614
free(org_line);
615
goto fallback;
688
{
689
char **new_argv = realloc(custom_argv, sizeof(char *)
690
* ((unsigned int)
691
custom_argc + 1));
692
if(new_argv == NULL){
693
error(0, errno, "realloc");
694
exitstatus = EX_OSERR;
695
free(new_arg);
696
free(org_line);
697
goto fallback;
698
} else {
699
custom_argv = new_argv;
700
}
616
701
}
617
702
custom_argv[custom_argc-1] = new_arg;
618
custom_argv[custom_argc] = NULL;
703
custom_argv[custom_argc] = NULL;
619
704
}
620
705
}
706
do {
707
ret = fclose(conffp);
708
} while(ret == EOF and errno == EINTR);
709
if(ret == EOF){
710
error(0, errno, "fclose");
711
exitstatus = EX_IOERR;
712
goto fallback;
713
}
621
714
free(org_line);
622
715
} else {
623
716
/* Check for harmful errors and go to fallback. Other errors might
624
717
not affect opening plugins */
625
718
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
626
perror("fopen");
627
exitstatus = EXIT_FAILURE;
719
error(0, errno, "fopen");
720
exitstatus = EX_OSERR;
628
721
goto fallback;
629
722
}
630
723
}
631
/* If there was any arguments from configuration file,
632
pass them to parser as command arguments */
724
/* If there were any arguments from the configuration file, pass
725
them to parser as command line arguments */
633
726
if(custom_argv != NULL){
634
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
635
0, NULL);
636
if(ret == ARGP_ERR_UNKNOWN){
637
fprintf(stderr, "Unknown error while parsing arguments\n");
638
exitstatus = EXIT_FAILURE;
727
ret = argp_parse(&argp, custom_argc, custom_argv,
728
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
729
NULL, NULL);
730
switch(ret){
731
case 0:
732
break;
733
case ENOMEM:
734
default:
735
errno = ret;
736
error(0, errno, "argp_parse");
737
exitstatus = EX_OSERR;
738
goto fallback;
739
case EINVAL:
740
exitstatus = EX_CONFIG;
639
741
goto fallback;
640
742
}
641
743
}
642
744
643
745
/* Parse actual command line arguments, to let them override the
644
746
config file */
645
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
646
if(ret == ARGP_ERR_UNKNOWN){
647
fprintf(stderr, "Unknown error while parsing arguments\n");
648
exitstatus = EXIT_FAILURE;
747
ret = argp_parse(&argp, argc, argv,
748
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
749
NULL, NULL);
750
switch(ret){
751
case 0:
752
break;
753
case ENOMEM:
754
default:
755
errno = ret;
756
error(0, errno, "argp_parse");
757
exitstatus = EX_OSERR;
758
goto fallback;
759
case EINVAL:
760
exitstatus = EX_USAGE;
649
761
goto fallback;
650
762
}
651
763
663
775
}
664
776
}
665
777
666
/* Strip permissions down to nobody */
667
setgid(gid);
778
if(getuid() == 0){
779
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
if(plugindir_fd == -1){
783
if(errno != ENOENT){
784
error(0, errno, "open(\"" PDIR "\")");
785
}
786
} else {
787
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
788
if(ret == -1){
789
error(0, errno, "fstat");
790
} else {
791
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
792
ret = fchown(plugindir_fd, uid, gid);
793
if(ret == -1){
794
error(0, errno, "fchown");
795
}
796
}
797
}
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
799
}
800
}
801
802
/* Lower permissions */
803
ret = setgid(gid);
668
804
if(ret == -1){
669
perror("setgid");
805
error(0, errno, "setgid");
670
806
}
671
807
ret = setuid(uid);
672
808
if(ret == -1){
673
perror("setuid");
674
}
675
676
if(plugindir == NULL){
677
dir = opendir(PDIR);
678
} else {
679
dir = opendir(plugindir);
680
}
681
682
if(dir == NULL){
683
perror("Could not open plugin dir");
684
exitstatus = EXIT_FAILURE;
685
goto fallback;
686
}
687
688
/* Set the FD_CLOEXEC flag on the directory, if possible */
809
error(0, errno, "setuid");
810
}
811
812
/* Open plugin directory with close_on_exec flag */
689
813
{
690
int dir_fd = dirfd(dir);
691
if(dir_fd >= 0){
692
ret = set_cloexec_flag(dir_fd);
693
if(ret < 0){
694
perror("set_cloexec_flag");
695
exitstatus = EXIT_FAILURE;
696
goto fallback;
814
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
815
#ifdef O_CLOEXEC
816
O_CLOEXEC
817
#else /* not O_CLOEXEC */
818
0
819
#endif /* not O_CLOEXEC */
820
);
821
if(dir_fd == -1){
822
error(0, errno, "Could not open plugin dir");
823
exitstatus = EX_UNAVAILABLE;
824
goto fallback;
825
}
826
827
#ifndef O_CLOEXEC
828
/* Set the FD_CLOEXEC flag on the directory */
829
ret = set_cloexec_flag(dir_fd);
830
if(ret < 0){
831
error(0, errno, "set_cloexec_flag");
832
exitstatus = EX_OSERR;
833
goto fallback;
834
}
835
#endif /* O_CLOEXEC */
836
}
837
838
int good_name(const struct dirent * const dirent){
839
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
840
"*.dpkg-old", "*.dpkg-bak",
841
"*.dpkg-divert", NULL };
842
#ifdef __GNUC__
843
#pragma GCC diagnostic push
844
#pragma GCC diagnostic ignored "-Wcast-qual"
845
#endif
846
for(const char **pat = (const char **)patterns;
847
*pat != NULL; pat++){
848
#ifdef __GNUC__
849
#pragma GCC diagnostic pop
850
#endif
851
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
852
!= FNM_NOMATCH){
853
if(debug){
854
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
855
" matching pattern %s\n", dirent->d_name, *pat);
856
}
857
return 0;
697
858
}
698
859
}
860
return 1;
861
}
862
863
#ifdef __GLIBC__
864
#if __GLIBC_PREREQ(2, 15)
865
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
866
alphasort);
867
#else /* not __GLIBC_PREREQ(2, 15) */
868
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
869
&direntries, good_name, alphasort);
870
#endif /* not __GLIBC_PREREQ(2, 15) */
871
#else /* not __GLIBC__ */
872
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
873
&direntries, good_name, alphasort);
874
#endif /* not __GLIBC__ */
875
if(numplugins == -1){
876
error(0, errno, "Could not scan plugin dir");
877
direntries = NULL;
878
exitstatus = EX_OSERR;
879
goto fallback;
699
880
}
700
881
701
882
FD_ZERO(&rfds_all);
702
883
703
884
/* Read and execute any executable in the plugin directory*/
704
while(true){
705
dirst = readdir(dir);
706
707
/* All directory entries have been processed */
708
if(dirst == NULL){
709
if(errno == EBADF){
710
perror("readdir");
711
exitstatus = EXIT_FAILURE;
712
goto fallback;
713
}
714
break;
715
}
716
717
d_name_len = strlen(dirst->d_name);
718
719
/* Ignore dotfiles, backup files and other junk */
720
{
721
bool bad_name = false;
722
723
const char const *bad_prefixes[] = { ".", "#", NULL };
724
725
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
726
".dpkg-old",
727
".dpkg-bak",
728
".dpkg-divert", NULL };
729
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
730
size_t pre_len = strlen(*pre);
731
if((d_name_len >= pre_len)
732
and strncmp((dirst->d_name), *pre, pre_len) == 0){
733
if(debug){
734
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
735
" with bad prefix %s\n", dirst->d_name, *pre);
736
}
737
bad_name = true;
738
break;
739
}
740
}
741
if(bad_name){
742
continue;
743
}
744
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
745
size_t suf_len = strlen(*suf);
746
if((d_name_len >= suf_len)
747
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
748
== 0)){
749
if(debug){
750
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
751
" with bad suffix %s\n", dirst->d_name, *suf);
752
}
753
bad_name = true;
754
break;
755
}
756
}
757
758
if(bad_name){
759
continue;
760
}
761
}
762
763
char *filename;
764
if(plugindir == NULL){
765
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
766
} else {
767
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
768
}
769
if(ret < 0){
770
perror("asprintf");
885
for(int i = 0; i < numplugins; i++){
886
887
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
888
if(plugin_fd == -1){
889
error(0, errno, "Could not open plugin");
771
890
continue;
772
891
}
773
774
ret = stat(filename, &st);
892
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
775
893
if(ret == -1){
776
perror("stat");
777
free(filename);
894
error(0, errno, "stat");
895
TEMP_FAILURE_RETRY(close(plugin_fd));
778
896
continue;
779
897
}
780
898
781
899
/* Ignore non-executable files */
782
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
900
if(not S_ISREG(st.st_mode)
901
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
902
X_OK, 0)) != 0)){
783
903
if(debug){
784
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
785
" with bad type or mode\n", filename);
904
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
905
" with bad type or mode\n",
906
plugindir != NULL ? plugindir : PDIR,
907
direntries[i]->d_name);
786
908
}
787
free(filename);
909
TEMP_FAILURE_RETRY(close(plugin_fd));
788
910
continue;
789
911
}
790
912
791
plugin *p = getplugin(dirst->d_name);
913
plugin *p = getplugin(direntries[i]->d_name);
792
914
if(p == NULL){
793
perror("getplugin");
794
free(filename);
915
error(0, errno, "getplugin");
916
TEMP_FAILURE_RETRY(close(plugin_fd));
795
917
continue;
796
918
}
797
919
if(p->disabled){
798
920
if(debug){
799
921
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
800
dirst->d_name);
922
direntries[i]->d_name);
801
923
}
802
free(filename);
924
TEMP_FAILURE_RETRY(close(plugin_fd));
803
925
continue;
804
926
}
805
927
{
808
930
if(g != NULL){
809
931
for(char **a = g->argv + 1; *a != NULL; a++){
810
932
if(not add_argument(p, *a)){
811
perror("add_argument");
933
error(0, errno, "add_argument");
812
934
}
813
935
}
814
936
/* Add global environment variables */
815
937
for(char **e = g->environ; *e != NULL; e++){
816
938
if(not add_environment(p, *e, false)){
817
perror("add_environment");
939
error(0, errno, "add_environment");
818
940
}
819
941
}
820
942
}
821
943
}
822
/* If this plugin has any environment variables, we will call
823
using execve and need to duplicate the environment from this
824
process, too. */
944
/* If this plugin has any environment variables, we need to
945
duplicate the environment from this process, too. */
825
946
if(p->environ[0] != NULL){
826
947
for(char **e = environ; *e != NULL; e++){
827
948
if(not add_environment(p, *e, false)){
828
perror("add_environment");
949
error(0, errno, "add_environment");
829
950
}
830
951
}
831
952
}
832
953
833
954
int pipefd[2];
834
ret = pipe(pipefd);
955
#ifndef O_CLOEXEC
956
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
957
#else /* O_CLOEXEC */
958
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
959
#endif /* O_CLOEXEC */
835
960
if(ret == -1){
836
perror("pipe");
837
exitstatus = EXIT_FAILURE;
838
goto fallback;
839
}
961
error(0, errno, "pipe");
962
exitstatus = EX_OSERR;
963
goto fallback;
964
}
965
if(pipefd[0] >= FD_SETSIZE){
966
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
967
FD_SETSIZE);
968
TEMP_FAILURE_RETRY(close(pipefd[0]));
969
TEMP_FAILURE_RETRY(close(pipefd[1]));
970
exitstatus = EX_OSERR;
971
goto fallback;
972
}
973
#ifndef O_CLOEXEC
840
974
/* Ask OS to automatic close the pipe on exec */
841
975
ret = set_cloexec_flag(pipefd[0]);
842
976
if(ret < 0){
843
perror("set_cloexec_flag");
844
exitstatus = EXIT_FAILURE;
977
error(0, errno, "set_cloexec_flag");
978
TEMP_FAILURE_RETRY(close(pipefd[0]));
979
TEMP_FAILURE_RETRY(close(pipefd[1]));
980
exitstatus = EX_OSERR;
845
981
goto fallback;
846
982
}
847
983
ret = set_cloexec_flag(pipefd[1]);
848
984
if(ret < 0){
849
perror("set_cloexec_flag");
850
exitstatus = EXIT_FAILURE;
985
error(0, errno, "set_cloexec_flag");
986
TEMP_FAILURE_RETRY(close(pipefd[0]));
987
TEMP_FAILURE_RETRY(close(pipefd[1]));
988
exitstatus = EX_OSERR;
851
989
goto fallback;
852
990
}
991
#endif /* not O_CLOEXEC */
853
992
/* Block SIGCHLD until process is safely in process list */
854
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
993
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
994
&sigchld_action.sa_mask,
995
NULL));
855
996
if(ret < 0){
856
perror("sigprocmask");
857
exitstatus = EXIT_FAILURE;
997
error(0, errno, "sigprocmask");
998
exitstatus = EX_OSERR;
858
999
goto fallback;
859
1000
}
860
1001
/* Starting a new process to be watched */
861
pid_t pid = fork();
1002
pid_t pid;
1003
do {
1004
pid = fork();
1005
} while(pid == -1 and errno == EINTR);
862
1006
if(pid == -1){
863
perror("fork");
864
exitstatus = EXIT_FAILURE;
1007
error(0, errno, "fork");
1008
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1009
&sigchld_action.sa_mask, NULL));
1010
TEMP_FAILURE_RETRY(close(pipefd[0]));
1011
TEMP_FAILURE_RETRY(close(pipefd[1]));
1012
exitstatus = EX_OSERR;
865
1013
goto fallback;
866
1014
}
867
1015
if(pid == 0){
868
1016
/* this is the child process */
869
1017
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
870
1018
if(ret < 0){
871
perror("sigaction");
872
_exit(EXIT_FAILURE);
1019
error(0, errno, "sigaction");
1020
_exit(EX_OSERR);
873
1021
}
874
1022
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
875
1023
if(ret < 0){
876
perror("sigprocmask");
877
_exit(EXIT_FAILURE);
1024
error(0, errno, "sigprocmask");
1025
_exit(EX_OSERR);
878
1026
}
879
1027
880
1028
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
881
1029
if(ret == -1){
882
perror("dup2");
883
_exit(EXIT_FAILURE);
1030
error(0, errno, "dup2");
1031
_exit(EX_OSERR);
884
1032
}
885
1033
886
if(dirfd(dir) < 0){
887
/* If dir has no file descriptor, we could not set FD_CLOEXEC
888
above and must now close it manually here. */
889
closedir(dir);
890
}
891
if(p->environ[0] == NULL){
892
if(execv(filename, p->argv) < 0){
893
perror("execv");
894
_exit(EXIT_FAILURE);
895
}
896
} else {
897
if(execve(filename, p->argv, p->environ) < 0){
898
perror("execve");
899
_exit(EXIT_FAILURE);
900
}
1034
if(fexecve(plugin_fd, p->argv,
1035
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1036
error(0, errno, "fexecve for %s/%s",
1037
plugindir != NULL ? plugindir : PDIR,
1038
direntries[i]->d_name);
1039
_exit(EX_OSERR);
901
1040
}
902
1041
/* no return */
903
1042
}
904
1043
/* Parent process */
905
close(pipefd[1]); /* Close unused write end of pipe */
906
free(filename);
907
plugin *new_plugin = getplugin(dirst->d_name);
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
1046
TEMP_FAILURE_RETRY(close(plugin_fd));
1047
plugin *new_plugin = getplugin(direntries[i]->d_name);
908
1048
if(new_plugin == NULL){
909
perror("getplugin");
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1049
error(0, errno, "getplugin");
1050
ret = (int)(TEMP_FAILURE_RETRY
1051
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1052
NULL)));
911
1053
if(ret < 0){
912
perror("sigprocmask");
1054
error(0, errno, "sigprocmask");
913
1055
}
914
exitstatus = EXIT_FAILURE;
1056
exitstatus = EX_OSERR;
915
1057
goto fallback;
916
1058
}
917
1059
920
1062
921
1063
/* Unblock SIGCHLD so signal handler can be run if this process
922
1064
has already completed */
923
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1066
&sigchld_action.sa_mask,
1067
NULL));
924
1068
if(ret < 0){
925
perror("sigprocmask");
926
exitstatus = EXIT_FAILURE;
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
927
1071
goto fallback;
928
1072
}
929
1073
930
FD_SET(new_plugin->fd, &rfds_all);
1074
#if defined (__GNUC__) and defined (__GLIBC__)
1075
#if not __GLIBC_PREREQ(2, 16)
1076
#pragma GCC diagnostic push
1077
#pragma GCC diagnostic ignored "-Wsign-conversion"
1078
#endif
1079
#endif
1080
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1081
-Wconversion in GNU libc
1082
before 2.16 */
1083
#if defined (__GNUC__) and defined (__GLIBC__)
1084
#if not __GLIBC_PREREQ(2, 16)
1085
#pragma GCC diagnostic pop
1086
#endif
1087
#endif
931
1088
932
1089
if(maxfd < new_plugin->fd){
933
1090
maxfd = new_plugin->fd;
934
1091
}
935
1092
}
936
1093
937
closedir(dir);
938
dir = NULL;
1094
free(direntries);
1095
direntries = NULL;
1096
TEMP_FAILURE_RETRY(close(dir_fd));
1097
dir_fd = -1;
1098
free_plugin(getplugin(NULL));
939
1099
940
1100
for(plugin *p = plugin_list; p != NULL; p = p->next){
941
1101
if(p->pid != 0){
952
1112
while(plugin_list){
953
1113
fd_set rfds = rfds_all;
954
1114
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
955
if(select_ret == -1){
956
perror("select");
957
exitstatus = EXIT_FAILURE;
1115
if(select_ret == -1 and errno != EINTR){
1116
error(0, errno, "select");
1117
exitstatus = EX_OSERR;
958
1118
goto fallback;
959
1119
}
960
1120
/* OK, now either a process completed, or something can be read
966
1126
if(not WIFEXITED(proc->status)
967
1127
or WEXITSTATUS(proc->status) != 0){
968
1128
/* Bad exit by plugin */
969
1129
970
1130
if(debug){
971
1131
if(WIFEXITED(proc->status)){
972
1132
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
975
1135
WEXITSTATUS(proc->status));
976
1136
} else if(WIFSIGNALED(proc->status)){
977
1137
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
978
" signal %d\n", proc->name,
1138
" signal %d: %s\n", proc->name,
979
1139
(intmax_t) (proc->pid),
980
WTERMSIG(proc->status));
1140
WTERMSIG(proc->status),
1141
strsignal(WTERMSIG(proc->status)));
981
1142
} else if(WCOREDUMP(proc->status)){
982
1143
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
983
1144
" core\n", proc->name, (intmax_t) (proc->pid));
985
1146
}
986
1147
987
1148
/* Remove the plugin */
988
FD_CLR(proc->fd, &rfds_all);
989
1149
#if defined (__GNUC__) and defined (__GLIBC__)
1150
#if not __GLIBC_PREREQ(2, 16)
1151
#pragma GCC diagnostic push
1152
#pragma GCC diagnostic ignored "-Wsign-conversion"
1153
#endif
1154
#endif
1155
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1156
-Wconversion in GNU libc
1157
before 2.16 */
1158
#if defined (__GNUC__) and defined (__GLIBC__)
1159
#if not __GLIBC_PREREQ(2, 16)
1160
#pragma GCC diagnostic pop
1161
#endif
1162
#endif
1163
990
1164
/* Block signal while modifying process_list */
991
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1165
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1166
(SIG_BLOCK,
1167
&sigchld_action.sa_mask,
1168
NULL));
992
1169
if(ret < 0){
993
perror("sigprocmask");
994
exitstatus = EXIT_FAILURE;
1170
error(0, errno, "sigprocmask");
1171
exitstatus = EX_OSERR;
995
1172
goto fallback;
996
1173
}
997
1174
1000
1177
proc = next_plugin;
1001
1178
1002
1179
/* We are done modifying process list, so unblock signal */
1003
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1004
NULL);
1180
ret = (int)(TEMP_FAILURE_RETRY
1181
(sigprocmask(SIG_UNBLOCK,
1182
&sigchld_action.sa_mask, NULL)));
1005
1183
if(ret < 0){
1006
perror("sigprocmask");
1007
exitstatus = EXIT_FAILURE;
1184
error(0, errno, "sigprocmask");
1185
exitstatus = EX_OSERR;
1008
1186
goto fallback;
1009
1187
}
1010
1188
1020
1198
bool bret = print_out_password(proc->buffer,
1021
1199
proc->buffer_length);
1022
1200
if(not bret){
1023
perror("print_out_password");
1024
exitstatus = EXIT_FAILURE;
1201
error(0, errno, "print_out_password");
1202
exitstatus = EX_IOERR;
1025
1203
}
1026
1204
goto fallback;
1027
1205
}
1028
1206
1029
1207
/* This process has not completed. Does it have any output? */
1030
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1208
#if defined (__GNUC__) and defined (__GLIBC__)
1209
#if not __GLIBC_PREREQ(2, 16)
1210
#pragma GCC diagnostic push
1211
#pragma GCC diagnostic ignored "-Wsign-conversion"
1212
#endif
1213
#endif
1214
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1215
warning from
1216
-Wconversion
1217
in GNU libc
1218
before
1219
2.16 */
1220
#if defined (__GNUC__) and defined (__GLIBC__)
1221
#if not __GLIBC_PREREQ(2, 16)
1222
#pragma GCC diagnostic pop
1223
#endif
1224
#endif
1031
1225
/* This process had nothing to say at this time */
1032
1226
proc = proc->next;
1033
1227
continue;
1034
1228
}
1035
1229
/* Before reading, make the process' data buffer large enough */
1036
1230
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1037
proc->buffer = realloc(proc->buffer, proc->buffer_size
1038
+ (size_t) BUFFER_SIZE);
1039
if(proc->buffer == NULL){
1040
perror("malloc");
1041
exitstatus = EXIT_FAILURE;
1231
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1232
+ (size_t) BUFFER_SIZE);
1233
if(new_buffer == NULL){
1234
error(0, errno, "malloc");
1235
exitstatus = EX_OSERR;
1042
1236
goto fallback;
1043
1237
}
1238
proc->buffer = new_buffer;
1044
1239
proc->buffer_size += BUFFER_SIZE;
1045
1240
}
1046
1241
/* Read from the process */
1047
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1048
BUFFER_SIZE);
1242
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1243
proc->buffer
1244
+ proc->buffer_length,
1245
BUFFER_SIZE));
1049
1246
if(sret < 0){
1050
1247
/* Read error from this process; ignore the error */
1051
1248
proc = proc->next;
1059
1256
}
1060
1257
}
1061
1258
}
1062
1063
1259
1260
1064
1261
fallback:
1065
1262
1066
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1263
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1264
and exitstatus != EX_OK)){
1067
1265
/* Fallback if all plugins failed, none are found or an error
1068
1266
occured */
1069
1267
bool bret;
1077
1275
}
1078
1276
bret = print_out_password(passwordbuffer, len);
1079
1277
if(not bret){
1080
perror("print_out_password");
1081
exitstatus = EXIT_FAILURE;
1278
error(0, errno, "print_out_password");
1279
exitstatus = EX_IOERR;
1082
1280
}
1083
1281
}
1084
1282
1085
1283
/* Restore old signal handler */
1086
1284
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1087
1285
if(ret == -1){
1088
perror("sigaction");
1089
exitstatus = EXIT_FAILURE;
1286
error(0, errno, "sigaction");
1287
exitstatus = EX_OSERR;
1090
1288
}
1091
1289
1092
1290
if(custom_argv != NULL){
1096
1294
free(custom_argv);
1097
1295
}
1098
1296
1099
if(dir != NULL){
1100
closedir(dir);
1297
free(direntries);
1298
1299
if(dir_fd != -1){
1300
TEMP_FAILURE_RETRY(close(dir_fd));
1101
1301
}
1102
1302
1103
1303
/* Kill the processes */
1107
1307
ret = kill(p->pid, SIGTERM);
1108
1308
if(ret == -1 and errno != ESRCH){
1109
1309
/* Set-uid proccesses might not get closed */
1110
perror("kill");
1310
error(0, errno, "kill");
1111
1311
}
1112
1312
}
1113
1313
}
1114
1314
1115
1315
/* Wait for any remaining child processes to terminate */
1116
do{
1316
do {
1117
1317
ret = wait(NULL);
1118
1318
} while(ret >= 0);
1119
1319
if(errno != ECHILD){
1120
perror("wait");
1320
error(0, errno, "wait");
1121
1321
}
1122
1322
1123
1323
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0