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- Committer: teddy at recompile
- Date: 2020-07-04 13:39:36 UTC
- mfrom: (237.4.132 release)
- Revision ID: teddy@recompile.se-20200704133936-lfk4sy1d48m53iqu
Merge from release branch
- files added:
- DBUS-API
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- 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
7
*
8
* This program is free software: you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License as
10
* published by the Free Software Foundation, either version 3 of the
11
* License, or (at your option) any later version.
12
*
13
* This program is distributed in the hope that it will be useful, but
5
* Copyright © 2008-2020 Teddy Hogeborn
6
* Copyright © 2008-2020 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
14
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
15
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
18
* General Public License for more details.
17
19
*
18
20
* You should have received a copy of the GNU General Public License
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
21
22
*
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
23
24
*/
24
25
25
26
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
27
O_CLOEXEC, pipe2() */
27
28
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
29
#include <stdlib.h> /* malloc(), reallocarray(), realloc(),
30
EXIT_SUCCESS, exit() */
30
31
#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() */
32
#include <stdio.h> /* fileno(), fprintf(),
33
stderr, STDOUT_FILENO, fclose() */
34
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
35
WIFEXITED(), WEXITSTATUS(), wait(),
36
pid_t, uid_t, gid_t, getuid(),
37
getgid() */
38
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
39
FD_SET(), FD_ISSET(), FD_CLR */
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS() */
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
41
WEXITSTATUS(), WTERMSIG() */
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
71
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
72
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
81
74
82
const char *argp_program_version = "plugin-runner " VERSION;
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
84
77
85
typedef struct plugin{
78
86
char *name; /* can be NULL or any plugin name */
81
89
char **environ;
82
90
int envc;
83
91
bool disabled;
84
92
85
93
/* Variables used for running processes*/
86
94
pid_t pid;
87
95
int fd;
98
106
99
107
/* Gets an existing plugin based on name,
100
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
101
110
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
111
/* Check for existing plugin with that name */
103
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
104
113
if((p->name == name)
105
114
or (p->name and name and (strcmp(p->name, name) == 0))){
107
116
}
108
117
}
109
118
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
111
123
if(new_plugin == NULL){
112
124
return NULL;
113
125
}
114
126
char *copy_name = NULL;
115
127
if(name != NULL){
116
copy_name = strdup(name);
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
117
131
if(copy_name == NULL){
132
int e = errno;
118
133
free(new_plugin);
134
errno = e;
119
135
return NULL;
120
136
}
121
137
}
125
141
.disabled = false,
126
142
.next = plugin_list };
127
143
128
new_plugin->argv = malloc(sizeof(char *) * 2);
144
do {
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
129
147
if(new_plugin->argv == NULL){
148
int e = errno;
130
149
free(copy_name);
131
150
free(new_plugin);
151
errno = e;
132
152
return NULL;
133
153
}
134
154
new_plugin->argv[0] = copy_name;
135
155
new_plugin->argv[1] = NULL;
136
156
137
new_plugin->environ = malloc(sizeof(char *));
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
138
160
if(new_plugin->environ == NULL){
161
int e = errno;
139
162
free(copy_name);
140
163
free(new_plugin->argv);
141
164
free(new_plugin);
165
errno = e;
142
166
return NULL;
143
167
}
144
168
new_plugin->environ[0] = NULL;
149
173
}
150
174
151
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
152
177
static bool add_to_char_array(const char *new, char ***array,
153
178
int *len){
154
179
/* Resize the pointed-to array to hold one more pointer */
155
*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
180
char **new_array = NULL;
181
do {
182
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
183
new_array = reallocarray(*array, (size_t)((*len) + 2),
184
sizeof(char *));
185
#else
186
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
187
/* overflow */
188
new_array = NULL;
189
errno = ENOMEM;
190
} else {
191
new_array = realloc(*array, (size_t)((*len) + 2)
192
* sizeof(char *));
193
}
194
#endif
195
} while(new_array == NULL and errno == EINTR);
157
196
/* Malloc check */
158
if(*array == NULL){
197
if(new_array == NULL){
159
198
return false;
160
199
}
200
*array = new_array;
161
201
/* Make a copy of the new string */
162
char *copy = strdup(new);
202
char *copy;
203
do {
204
copy = strdup(new);
205
} while(copy == NULL and errno == EINTR);
163
206
if(copy == NULL){
164
207
return false;
165
208
}
172
215
}
173
216
174
217
/* Add to a plugin's argument vector */
218
__attribute__((nonnull(2), warn_unused_result))
175
219
static bool add_argument(plugin *p, const char *arg){
176
220
if(p == NULL){
177
221
return false;
180
224
}
181
225
182
226
/* Add to a plugin's environment */
227
__attribute__((nonnull(2), warn_unused_result))
183
228
static bool add_environment(plugin *p, const char *def, bool replace){
184
229
if(p == NULL){
185
230
return false;
187
232
/* namelen = length of name of environment variable */
188
233
size_t namelen = (size_t)(strchrnul(def, '=') - def);
189
234
/* Search for this environment variable */
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
235
for(char **envdef = p->environ; *envdef != NULL; envdef++){
236
if(strncmp(*envdef, def, namelen + 1) == 0){
192
237
/* It already exists */
193
238
if(replace){
194
char *new = realloc(*e, strlen(def) + 1);
195
if(new == NULL){
239
char *new_envdef;
240
do {
241
new_envdef = realloc(*envdef, strlen(def) + 1);
242
} while(new_envdef == NULL and errno == EINTR);
243
if(new_envdef == NULL){
196
244
return false;
197
245
}
198
*e = new;
199
strcpy(*e, def);
246
*envdef = new_envdef;
247
strcpy(*envdef, def);
200
248
}
201
249
return true;
202
250
}
204
252
return add_to_char_array(def, &(p->environ), &(p->envc));
205
253
}
206
254
255
#ifndef O_CLOEXEC
207
256
/*
208
257
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
258
* Descriptor Flags".
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
259
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
211
260
*/
261
__attribute__((warn_unused_result))
212
262
static int set_cloexec_flag(int fd){
213
int ret = fcntl(fd, F_GETFD, 0);
263
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
264
/* If reading the flags failed, return error indication now. */
215
265
if(ret < 0){
216
266
return ret;
217
267
}
218
268
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
269
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
270
ret | FD_CLOEXEC));
220
271
}
272
#endif /* not O_CLOEXEC */
221
273
222
274
223
275
/* Mark processes as completed when they exit, and save their exit
237
289
/* No child processes */
238
290
break;
239
291
}
240
perror("waitpid");
292
error(0, errno, "waitpid");
241
293
}
242
294
243
295
/* A child exited, find it in process_list */
255
307
}
256
308
257
309
/* Prints out a password to stdout */
310
__attribute__((nonnull, warn_unused_result))
258
311
static bool print_out_password(const char *buffer, size_t length){
259
312
ssize_t ret;
260
313
for(size_t written = 0; written < length; written += (size_t)ret){
268
321
}
269
322
270
323
/* Removes and free a plugin from the plugin list */
324
__attribute__((nonnull))
271
325
static void free_plugin(plugin *plugin_node){
272
326
273
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
327
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
274
328
free(*arg);
275
329
}
330
free(plugin_node->name);
276
331
free(plugin_node->argv);
277
332
for(char **env = plugin_node->environ; *env != NULL; env++){
278
333
free(*env);
279
334
}
280
335
free(plugin_node->environ);
281
336
free(plugin_node->buffer);
282
337
283
338
/* Removes the plugin from the singly-linked list */
284
339
if(plugin_node == plugin_list){
285
340
/* First one - simple */
305
360
306
361
int main(int argc, char *argv[]){
307
362
char *plugindir = NULL;
363
char *pluginhelperdir = NULL;
308
364
char *argfile = NULL;
309
365
FILE *conffp;
310
size_t d_name_len;
311
DIR *dir = NULL;
312
struct dirent *dirst;
366
struct dirent **direntries = NULL;
313
367
struct stat st;
314
368
fd_set rfds_all;
315
int ret, numchars, maxfd = 0;
369
int ret, maxfd = 0;
316
370
ssize_t sret;
317
intmax_t tmpmax;
318
371
uid_t uid = 65534;
319
372
gid_t gid = 65534;
320
373
bool debug = false;
324
377
.sa_flags = SA_NOCLDSTOP };
325
378
char **custom_argv = NULL;
326
379
int custom_argc = 0;
380
int dir_fd = -1;
327
381
328
382
/* Establish a signal handler */
329
383
sigemptyset(&sigchld_action.sa_mask);
330
384
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
331
385
if(ret == -1){
332
perror("sigaddset");
333
exitstatus = EXIT_FAILURE;
386
error(0, errno, "sigaddset");
387
exitstatus = EX_OSERR;
334
388
goto fallback;
335
389
}
336
390
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
337
391
if(ret == -1){
338
perror("sigaction");
339
exitstatus = EXIT_FAILURE;
392
error(0, errno, "sigaction");
393
exitstatus = EX_OSERR;
340
394
goto fallback;
341
395
}
342
396
374
428
.doc = "Group ID the plugins will run as", .group = 3 },
375
429
{ .name = "debug", .key = 132,
376
430
.doc = "Debug mode", .group = 4 },
431
{ .name = "plugin-helper-dir", .key = 133,
432
.arg = "DIRECTORY",
433
.doc = "Specify a different plugin helper directory",
434
.group = 2 },
435
/*
436
* These reproduce what we would get without ARGP_NO_HELP
437
*/
438
{ .name = "help", .key = '?',
439
.doc = "Give this help list", .group = -1 },
440
{ .name = "usage", .key = -3,
441
.doc = "Give a short usage message", .group = -1 },
442
{ .name = "version", .key = 'V',
443
.doc = "Print program version", .group = -1 },
377
444
{ .name = NULL }
378
445
};
379
446
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
447
__attribute__((nonnull(3)))
448
error_t parse_opt(int key, char *arg, struct argp_state *state){
449
errno = 0;
382
450
switch(key){
451
char *tmp;
452
intmax_t tmp_id;
383
453
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;
454
{
455
char *plugin_option;
456
while((plugin_option = strsep(&arg, ",")) != NULL){
457
if(not add_argument(getplugin(NULL), plugin_option)){
458
break;
393
459
}
394
460
}
461
errno = 0;
395
462
}
396
463
break;
397
464
case 'G': /* --global-env */
398
if(arg == NULL){
399
break;
400
}
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
465
if(add_environment(getplugin(NULL), arg, true)){
466
errno = 0;
403
467
}
404
468
break;
405
469
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
}
470
{
471
char *option_list = strchr(arg, ':');
472
if(option_list == NULL){
473
argp_error(state, "No colon in \"%s\"", arg);
474
errno = EINVAL;
475
break;
476
}
477
*option_list = '\0';
478
option_list++;
479
if(arg[0] == '\0'){
480
argp_error(state, "Empty plugin name");
481
errno = EINVAL;
482
break;
483
}
484
char *option;
485
while((option = strsep(&option_list, ",")) != NULL){
486
if(not add_argument(getplugin(arg), option)){
487
break;
488
}
489
}
490
errno = 0;
425
491
}
426
492
break;
427
493
case 'E': /* --env-for */
428
if(arg == NULL){
429
break;
430
}
431
494
{
432
495
char *envdef = strchr(arg, ':');
433
496
if(envdef == NULL){
497
argp_error(state, "No colon in \"%s\"", arg);
498
errno = EINVAL;
434
499
break;
435
500
}
436
501
*envdef = '\0';
437
if(not add_environment(getplugin(arg), envdef+1, true)){
438
perror("add_environment");
502
envdef++;
503
if(arg[0] == '\0'){
504
argp_error(state, "Empty plugin name");
505
errno = EINVAL;
506
break;
507
}
508
if(add_environment(getplugin(arg), envdef, true)){
509
errno = 0;
439
510
}
440
511
}
441
512
break;
442
513
case 'd': /* --disable */
443
if(arg != NULL){
514
{
444
515
plugin *p = getplugin(arg);
445
if(p == NULL){
446
return ARGP_ERR_UNKNOWN;
516
if(p != NULL){
517
p->disabled = true;
518
errno = 0;
447
519
}
448
p->disabled = true;
449
520
}
450
521
break;
451
522
case 'e': /* --enable */
452
if(arg != NULL){
523
{
453
524
plugin *p = getplugin(arg);
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
525
if(p != NULL){
526
p->disabled = false;
527
errno = 0;
456
528
}
457
p->disabled = false;
458
529
}
459
530
break;
460
531
case 128: /* --plugin-dir */
461
532
free(plugindir);
462
533
plugindir = strdup(arg);
463
if(plugindir == NULL){
464
perror("strdup");
465
}
534
if(plugindir != NULL){
535
errno = 0;
536
}
466
537
break;
467
538
case 129: /* --config-file */
468
539
/* This is already done by parse_opt_config_file() */
469
540
break;
470
541
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;
542
tmp_id = strtoimax(arg, &tmp, 10);
543
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (uid_t)tmp_id){
545
argp_error(state, "Bad user ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)uid);
547
break;
478
548
}
549
uid = (uid_t)tmp_id;
550
errno = 0;
479
551
break;
480
552
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;
553
tmp_id = strtoimax(arg, &tmp, 10);
554
if(errno != 0 or tmp == arg or *tmp != '\0'
555
or tmp_id != (gid_t)tmp_id){
556
argp_error(state, "Bad group ID number: \"%s\", using %"
557
PRIdMAX, arg, (intmax_t)gid);
558
break;
488
559
}
560
gid = (gid_t)tmp_id;
561
errno = 0;
489
562
break;
490
563
case 132: /* --debug */
491
564
debug = true;
492
565
break;
566
case 133: /* --plugin-helper-dir */
567
free(pluginhelperdir);
568
pluginhelperdir = strdup(arg);
569
if(pluginhelperdir != NULL){
570
errno = 0;
571
}
572
break;
573
/*
574
* These reproduce what we would get without ARGP_NO_HELP
575
*/
576
case '?': /* --help */
577
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
578
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
579
__builtin_unreachable();
580
case -3: /* --usage */
581
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
582
argp_state_help(state, state->out_stream,
583
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
584
__builtin_unreachable();
585
case 'V': /* --version */
586
fprintf(state->out_stream, "%s\n", argp_program_version);
587
exit(EXIT_SUCCESS);
588
break;
493
589
/*
494
590
* When adding more options before this line, remember to also add a
495
591
* "case" to the "parse_opt_config_file" function below.
498
594
/* Cryptsetup always passes an argument, which is an empty
499
595
string if "none" was specified in /etc/crypttab. So if
500
596
argument was empty, we ignore it silently. */
501
if(arg[0] != '\0'){
502
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
597
if(arg[0] == '\0'){
598
break;
503
599
}
504
break;
505
case ARGP_KEY_END:
506
break;
600
#if __GNUC__ >= 7
601
__attribute__((fallthrough));
602
#else
603
/* FALLTHROUGH */
604
#endif
507
605
default:
508
606
return ARGP_ERR_UNKNOWN;
509
607
}
510
return 0;
608
return errno; /* Set to 0 at start */
511
609
}
512
610
513
611
/* This option parser is the same as parse_opt() above, except it
515
613
error_t parse_opt_config_file(int key, char *arg,
516
614
__attribute__((unused))
517
615
struct argp_state *state){
616
errno = 0;
518
617
switch(key){
519
618
case 'g': /* --global-options */
520
619
case 'G': /* --global-env */
527
626
case 129: /* --config-file */
528
627
free(argfile);
529
628
argfile = strdup(arg);
530
if(argfile == NULL){
531
perror("strdup");
629
if(argfile != NULL){
630
errno = 0;
532
631
}
533
break;
632
break;
534
633
case 130: /* --userid */
535
634
case 131: /* --groupid */
536
635
case 132: /* --debug */
636
case 133: /* --plugin-helper-dir */
637
case '?': /* --help */
638
case -3: /* --usage */
639
case 'V': /* --version */
537
640
case ARGP_KEY_ARG:
538
case ARGP_KEY_END:
539
641
break;
540
642
default:
541
643
return ARGP_ERR_UNKNOWN;
542
644
}
543
return 0;
645
return errno;
544
646
}
545
647
546
648
struct argp argp = { .options = options,
550
652
551
653
/* Parse using parse_opt_config_file() in order to get the custom
552
654
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;
655
ret = argp_parse(&argp, argc, argv,
656
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
657
NULL, NULL);
658
switch(ret){
659
case 0:
660
break;
661
case ENOMEM:
662
default:
663
errno = ret;
664
error(0, errno, "argp_parse");
665
exitstatus = EX_OSERR;
666
goto fallback;
667
case EINVAL:
668
exitstatus = EX_USAGE;
557
669
goto fallback;
558
670
}
559
671
565
677
conffp = fopen(AFILE, "r");
566
678
} else {
567
679
conffp = fopen(argfile, "r");
568
}
680
}
569
681
if(conffp != NULL){
570
682
char *org_line = NULL;
571
683
char *p, *arg, *new_arg, *line;
572
684
size_t size = 0;
573
685
const char whitespace_delims[] = " \r\t\f\v\n";
574
686
const char comment_delim[] = "#";
575
687
576
688
custom_argc = 1;
577
689
custom_argv = malloc(sizeof(char*) * 2);
578
690
if(custom_argv == NULL){
579
perror("malloc");
580
exitstatus = EXIT_FAILURE;
691
error(0, errno, "malloc");
692
exitstatus = EX_OSERR;
581
693
goto fallback;
582
694
}
583
695
custom_argv[0] = argv[0];
584
696
custom_argv[1] = NULL;
585
697
586
698
/* for each line in the config file, strip whitespace and ignore
587
699
commented text */
588
700
while(true){
590
702
if(sret == -1){
591
703
break;
592
704
}
593
705
594
706
line = org_line;
595
707
arg = strsep(&line, comment_delim);
596
708
while((p = strsep(&arg, whitespace_delims)) != NULL){
599
711
}
600
712
new_arg = strdup(p);
601
713
if(new_arg == NULL){
602
perror("strdup");
603
exitstatus = EXIT_FAILURE;
714
error(0, errno, "strdup");
715
exitstatus = EX_OSERR;
604
716
free(org_line);
605
717
goto fallback;
606
718
}
607
719
608
720
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;
721
{
722
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
723
char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
724
sizeof(char *));
725
#else
726
char **new_argv = NULL;
727
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
728
/* overflow */
729
errno = ENOMEM;
730
} else {
731
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
732
* sizeof(char *));
733
}
734
#endif
735
if(new_argv == NULL){
736
error(0, errno, "reallocarray");
737
exitstatus = EX_OSERR;
738
free(new_arg);
739
free(org_line);
740
goto fallback;
741
} else {
742
custom_argv = new_argv;
743
}
616
744
}
617
745
custom_argv[custom_argc-1] = new_arg;
618
custom_argv[custom_argc] = NULL;
746
custom_argv[custom_argc] = NULL;
619
747
}
620
748
}
749
do {
750
ret = fclose(conffp);
751
} while(ret == EOF and errno == EINTR);
752
if(ret == EOF){
753
error(0, errno, "fclose");
754
exitstatus = EX_IOERR;
755
goto fallback;
756
}
621
757
free(org_line);
622
758
} else {
623
759
/* Check for harmful errors and go to fallback. Other errors might
624
760
not affect opening plugins */
625
761
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
626
perror("fopen");
627
exitstatus = EXIT_FAILURE;
762
error(0, errno, "fopen");
763
exitstatus = EX_OSERR;
628
764
goto fallback;
629
765
}
630
766
}
631
/* If there was any arguments from configuration file,
632
pass them to parser as command arguments */
767
/* If there were any arguments from the configuration file, pass
768
them to parser as command line arguments */
633
769
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;
770
ret = argp_parse(&argp, custom_argc, custom_argv,
771
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
772
NULL, NULL);
773
switch(ret){
774
case 0:
775
break;
776
case ENOMEM:
777
default:
778
errno = ret;
779
error(0, errno, "argp_parse");
780
exitstatus = EX_OSERR;
781
goto fallback;
782
case EINVAL:
783
exitstatus = EX_CONFIG;
639
784
goto fallback;
640
785
}
641
786
}
642
787
643
788
/* Parse actual command line arguments, to let them override the
644
789
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;
649
goto fallback;
790
ret = argp_parse(&argp, argc, argv,
791
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
792
NULL, NULL);
793
switch(ret){
794
case 0:
795
break;
796
case ENOMEM:
797
default:
798
errno = ret;
799
error(0, errno, "argp_parse");
800
exitstatus = EX_OSERR;
801
goto fallback;
802
case EINVAL:
803
exitstatus = EX_USAGE;
804
goto fallback;
805
}
806
807
{
808
char *pluginhelperenv;
809
bool bret = true;
810
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
811
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
812
if(ret != -1){
813
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
814
}
815
if(ret == -1 or not bret){
816
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
817
" environment variable to \"%s\" for all plugins\n",
818
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
819
}
820
if(ret != -1){
821
free(pluginhelperenv);
822
}
650
823
}
651
824
652
825
if(debug){
653
for(plugin *p = plugin_list; p != NULL; p=p->next){
826
for(plugin *p = plugin_list; p != NULL; p = p->next){
654
827
fprintf(stderr, "Plugin: %s has %d arguments\n",
655
828
p->name ? p->name : "Global", p->argc - 1);
656
829
for(char **a = p->argv; *a != NULL; a++){
663
836
}
664
837
}
665
838
666
/* Strip permissions down to nobody */
667
setgid(gid);
839
if(getuid() == 0){
840
/* Work around Debian bug #633582:
841
<https://bugs.debian.org/633582> */
842
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
843
if(plugindir_fd == -1){
844
if(errno != ENOENT){
845
error(0, errno, "open(\"" PDIR "\")");
846
}
847
} else {
848
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
849
if(ret == -1){
850
error(0, errno, "fstat");
851
} else {
852
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
853
ret = fchown(plugindir_fd, uid, gid);
854
if(ret == -1){
855
error(0, errno, "fchown");
856
}
857
}
858
}
859
close(plugindir_fd);
860
}
861
}
862
863
/* Lower permissions */
864
ret = setgid(gid);
668
865
if(ret == -1){
669
perror("setgid");
866
error(0, errno, "setgid");
670
867
}
671
868
ret = setuid(uid);
672
869
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 */
870
error(0, errno, "setuid");
871
}
872
873
/* Open plugin directory with close_on_exec flag */
689
874
{
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;
875
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
876
#ifdef O_CLOEXEC
877
O_CLOEXEC
878
#else /* not O_CLOEXEC */
879
0
880
#endif /* not O_CLOEXEC */
881
);
882
if(dir_fd == -1){
883
error(0, errno, "Could not open plugin dir");
884
exitstatus = EX_UNAVAILABLE;
885
goto fallback;
886
}
887
888
#ifndef O_CLOEXEC
889
/* Set the FD_CLOEXEC flag on the directory */
890
ret = set_cloexec_flag(dir_fd);
891
if(ret < 0){
892
error(0, errno, "set_cloexec_flag");
893
exitstatus = EX_OSERR;
894
goto fallback;
895
}
896
#endif /* O_CLOEXEC */
897
}
898
899
int good_name(const struct dirent * const dirent){
900
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
901
"*.dpkg-old", "*.dpkg-bak",
902
"*.dpkg-divert", NULL };
903
#ifdef __GNUC__
904
#pragma GCC diagnostic push
905
#pragma GCC diagnostic ignored "-Wcast-qual"
906
#endif
907
for(const char **pat = (const char **)patterns;
908
*pat != NULL; pat++){
909
#ifdef __GNUC__
910
#pragma GCC diagnostic pop
911
#endif
912
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
913
!= FNM_NOMATCH){
914
if(debug){
915
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
916
" matching pattern %s\n", dirent->d_name, *pat);
917
}
918
return 0;
697
919
}
698
920
}
921
return 1;
922
}
923
924
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
925
alphasort);
926
if(numplugins == -1){
927
error(0, errno, "Could not scan plugin dir");
928
direntries = NULL;
929
exitstatus = EX_OSERR;
930
goto fallback;
699
931
}
700
932
701
933
FD_ZERO(&rfds_all);
702
934
703
935
/* 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");
936
for(int i = 0; i < numplugins; i++){
937
938
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
939
if(plugin_fd == -1){
940
error(0, errno, "Could not open plugin");
941
free(direntries[i]);
771
942
continue;
772
943
}
773
774
ret = stat(filename, &st);
944
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
775
945
if(ret == -1){
776
perror("stat");
777
free(filename);
946
error(0, errno, "stat");
947
close(plugin_fd);
948
free(direntries[i]);
778
949
continue;
779
950
}
780
951
781
952
/* Ignore non-executable files */
782
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
953
if(not S_ISREG(st.st_mode)
954
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
955
X_OK, 0)) != 0)){
783
956
if(debug){
784
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
785
" with bad type or mode\n", filename);
957
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
958
" with bad type or mode\n",
959
plugindir != NULL ? plugindir : PDIR,
960
direntries[i]->d_name);
786
961
}
787
free(filename);
962
close(plugin_fd);
963
free(direntries[i]);
788
964
continue;
789
965
}
790
966
791
plugin *p = getplugin(dirst->d_name);
967
plugin *p = getplugin(direntries[i]->d_name);
792
968
if(p == NULL){
793
perror("getplugin");
794
free(filename);
969
error(0, errno, "getplugin");
970
close(plugin_fd);
971
free(direntries[i]);
795
972
continue;
796
973
}
797
974
if(p->disabled){
798
975
if(debug){
799
976
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
800
dirst->d_name);
977
direntries[i]->d_name);
801
978
}
802
free(filename);
979
close(plugin_fd);
980
free(direntries[i]);
803
981
continue;
804
982
}
805
983
{
808
986
if(g != NULL){
809
987
for(char **a = g->argv + 1; *a != NULL; a++){
810
988
if(not add_argument(p, *a)){
811
perror("add_argument");
989
error(0, errno, "add_argument");
812
990
}
813
991
}
814
992
/* Add global environment variables */
815
993
for(char **e = g->environ; *e != NULL; e++){
816
994
if(not add_environment(p, *e, false)){
817
perror("add_environment");
995
error(0, errno, "add_environment");
818
996
}
819
997
}
820
998
}
821
999
}
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. */
1000
/* If this plugin has any environment variables, we need to
1001
duplicate the environment from this process, too. */
825
1002
if(p->environ[0] != NULL){
826
1003
for(char **e = environ; *e != NULL; e++){
827
1004
if(not add_environment(p, *e, false)){
828
perror("add_environment");
1005
error(0, errno, "add_environment");
829
1006
}
830
1007
}
831
1008
}
832
1009
833
1010
int pipefd[2];
834
ret = pipe(pipefd);
1011
#ifndef O_CLOEXEC
1012
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1013
#else /* O_CLOEXEC */
1014
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1015
#endif /* O_CLOEXEC */
835
1016
if(ret == -1){
836
perror("pipe");
837
exitstatus = EXIT_FAILURE;
838
goto fallback;
839
}
1017
error(0, errno, "pipe");
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
1020
goto fallback;
1021
}
1022
if(pipefd[0] >= FD_SETSIZE){
1023
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1024
FD_SETSIZE);
1025
close(pipefd[0]);
1026
close(pipefd[1]);
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
1029
goto fallback;
1030
}
1031
#ifndef O_CLOEXEC
840
1032
/* Ask OS to automatic close the pipe on exec */
841
1033
ret = set_cloexec_flag(pipefd[0]);
842
1034
if(ret < 0){
843
perror("set_cloexec_flag");
844
exitstatus = EXIT_FAILURE;
1035
error(0, errno, "set_cloexec_flag");
1036
close(pipefd[0]);
1037
close(pipefd[1]);
1038
exitstatus = EX_OSERR;
1039
free(direntries[i]);
845
1040
goto fallback;
846
1041
}
847
1042
ret = set_cloexec_flag(pipefd[1]);
848
1043
if(ret < 0){
849
perror("set_cloexec_flag");
850
exitstatus = EXIT_FAILURE;
1044
error(0, errno, "set_cloexec_flag");
1045
close(pipefd[0]);
1046
close(pipefd[1]);
1047
exitstatus = EX_OSERR;
1048
free(direntries[i]);
851
1049
goto fallback;
852
1050
}
1051
#endif /* not O_CLOEXEC */
853
1052
/* Block SIGCHLD until process is safely in process list */
854
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1053
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1054
&sigchld_action.sa_mask,
1055
NULL));
855
1056
if(ret < 0){
856
perror("sigprocmask");
857
exitstatus = EXIT_FAILURE;
1057
error(0, errno, "sigprocmask");
1058
exitstatus = EX_OSERR;
1059
free(direntries[i]);
858
1060
goto fallback;
859
1061
}
860
1062
/* Starting a new process to be watched */
861
pid_t pid = fork();
1063
pid_t pid;
1064
do {
1065
pid = fork();
1066
} while(pid == -1 and errno == EINTR);
862
1067
if(pid == -1){
863
perror("fork");
864
exitstatus = EXIT_FAILURE;
1068
error(0, errno, "fork");
1069
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1070
&sigchld_action.sa_mask, NULL));
1071
close(pipefd[0]);
1072
close(pipefd[1]);
1073
exitstatus = EX_OSERR;
1074
free(direntries[i]);
865
1075
goto fallback;
866
1076
}
867
1077
if(pid == 0){
868
1078
/* this is the child process */
869
1079
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
870
1080
if(ret < 0){
871
perror("sigaction");
872
_exit(EXIT_FAILURE);
1081
error(0, errno, "sigaction");
1082
_exit(EX_OSERR);
873
1083
}
874
1084
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
875
1085
if(ret < 0){
876
perror("sigprocmask");
877
_exit(EXIT_FAILURE);
1086
error(0, errno, "sigprocmask");
1087
_exit(EX_OSERR);
878
1088
}
879
1089
880
1090
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
881
1091
if(ret == -1){
882
perror("dup2");
883
_exit(EXIT_FAILURE);
1092
error(0, errno, "dup2");
1093
_exit(EX_OSERR);
884
1094
}
885
1095
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
}
1096
if(fexecve(plugin_fd, p->argv,
1097
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1098
error(0, errno, "fexecve for %s/%s",
1099
plugindir != NULL ? plugindir : PDIR,
1100
direntries[i]->d_name);
1101
_exit(EX_OSERR);
901
1102
}
902
1103
/* no return */
903
1104
}
904
1105
/* Parent process */
905
1106
close(pipefd[1]); /* Close unused write end of pipe */
906
free(filename);
907
plugin *new_plugin = getplugin(dirst->d_name);
1107
close(plugin_fd);
1108
plugin *new_plugin = getplugin(direntries[i]->d_name);
908
1109
if(new_plugin == NULL){
909
perror("getplugin");
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1110
error(0, errno, "getplugin");
1111
ret = (int)(TEMP_FAILURE_RETRY
1112
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1113
NULL)));
911
1114
if(ret < 0){
912
perror("sigprocmask");
1115
error(0, errno, "sigprocmask");
913
1116
}
914
exitstatus = EXIT_FAILURE;
1117
exitstatus = EX_OSERR;
1118
free(direntries[i]);
915
1119
goto fallback;
916
1120
}
1121
free(direntries[i]);
917
1122
918
1123
new_plugin->pid = pid;
919
1124
new_plugin->fd = pipefd[0];
920
1125
1126
if(debug){
1127
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1128
new_plugin->name, (intmax_t) (new_plugin->pid));
1129
}
1130
921
1131
/* Unblock SIGCHLD so signal handler can be run if this process
922
1132
has already completed */
923
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1134
&sigchld_action.sa_mask,
1135
NULL));
924
1136
if(ret < 0){
925
perror("sigprocmask");
926
exitstatus = EXIT_FAILURE;
1137
error(0, errno, "sigprocmask");
1138
exitstatus = EX_OSERR;
927
1139
goto fallback;
928
1140
}
929
1141
934
1146
}
935
1147
}
936
1148
937
closedir(dir);
938
dir = NULL;
1149
free(direntries);
1150
direntries = NULL;
1151
close(dir_fd);
1152
dir_fd = -1;
1153
free_plugin(getplugin(NULL));
939
1154
940
1155
for(plugin *p = plugin_list; p != NULL; p = p->next){
941
1156
if(p->pid != 0){
952
1167
while(plugin_list){
953
1168
fd_set rfds = rfds_all;
954
1169
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
955
if(select_ret == -1){
956
perror("select");
957
exitstatus = EXIT_FAILURE;
1170
if(select_ret == -1 and errno != EINTR){
1171
error(0, errno, "select");
1172
exitstatus = EX_OSERR;
958
1173
goto fallback;
959
1174
}
960
1175
/* OK, now either a process completed, or something can be read
966
1181
if(not WIFEXITED(proc->status)
967
1182
or WEXITSTATUS(proc->status) != 0){
968
1183
/* Bad exit by plugin */
969
1184
970
1185
if(debug){
971
1186
if(WIFEXITED(proc->status)){
972
1187
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
975
1190
WEXITSTATUS(proc->status));
976
1191
} else if(WIFSIGNALED(proc->status)){
977
1192
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
978
" signal %d\n", proc->name,
1193
" signal %d: %s\n", proc->name,
979
1194
(intmax_t) (proc->pid),
980
WTERMSIG(proc->status));
981
} else if(WCOREDUMP(proc->status)){
982
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
983
" core\n", proc->name, (intmax_t) (proc->pid));
1195
WTERMSIG(proc->status),
1196
strsignal(WTERMSIG(proc->status)));
984
1197
}
985
1198
}
986
1199
987
1200
/* Remove the plugin */
988
1201
FD_CLR(proc->fd, &rfds_all);
989
1202
990
1203
/* Block signal while modifying process_list */
991
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1204
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1205
(SIG_BLOCK,
1206
&sigchld_action.sa_mask,
1207
NULL));
992
1208
if(ret < 0){
993
perror("sigprocmask");
994
exitstatus = EXIT_FAILURE;
1209
error(0, errno, "sigprocmask");
1210
exitstatus = EX_OSERR;
995
1211
goto fallback;
996
1212
}
997
1213
1000
1216
proc = next_plugin;
1001
1217
1002
1218
/* We are done modifying process list, so unblock signal */
1003
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1004
NULL);
1219
ret = (int)(TEMP_FAILURE_RETRY
1220
(sigprocmask(SIG_UNBLOCK,
1221
&sigchld_action.sa_mask, NULL)));
1005
1222
if(ret < 0){
1006
perror("sigprocmask");
1007
exitstatus = EXIT_FAILURE;
1223
error(0, errno, "sigprocmask");
1224
exitstatus = EX_OSERR;
1008
1225
goto fallback;
1009
1226
}
1010
1227
1020
1237
bool bret = print_out_password(proc->buffer,
1021
1238
proc->buffer_length);
1022
1239
if(not bret){
1023
perror("print_out_password");
1024
exitstatus = EXIT_FAILURE;
1240
error(0, errno, "print_out_password");
1241
exitstatus = EX_IOERR;
1025
1242
}
1026
1243
goto fallback;
1027
1244
}
1034
1251
}
1035
1252
/* Before reading, make the process' data buffer large enough */
1036
1253
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;
1254
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1255
+ (size_t) BUFFER_SIZE);
1256
if(new_buffer == NULL){
1257
error(0, errno, "malloc");
1258
exitstatus = EX_OSERR;
1042
1259
goto fallback;
1043
1260
}
1261
proc->buffer = new_buffer;
1044
1262
proc->buffer_size += BUFFER_SIZE;
1045
1263
}
1046
1264
/* Read from the process */
1047
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1048
BUFFER_SIZE);
1265
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1266
proc->buffer
1267
+ proc->buffer_length,
1268
BUFFER_SIZE));
1049
1269
if(sret < 0){
1050
1270
/* Read error from this process; ignore the error */
1051
1271
proc = proc->next;
1059
1279
}
1060
1280
}
1061
1281
}
1062
1063
1282
1283
1064
1284
fallback:
1065
1285
1066
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1286
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1287
and exitstatus != EX_OK)){
1067
1288
/* Fallback if all plugins failed, none are found or an error
1068
1289
occured */
1069
1290
bool bret;
1077
1298
}
1078
1299
bret = print_out_password(passwordbuffer, len);
1079
1300
if(not bret){
1080
perror("print_out_password");
1081
exitstatus = EXIT_FAILURE;
1301
error(0, errno, "print_out_password");
1302
exitstatus = EX_IOERR;
1082
1303
}
1083
1304
}
1084
1305
1085
1306
/* Restore old signal handler */
1086
1307
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1087
1308
if(ret == -1){
1088
perror("sigaction");
1089
exitstatus = EXIT_FAILURE;
1309
error(0, errno, "sigaction");
1310
exitstatus = EX_OSERR;
1090
1311
}
1091
1312
1092
1313
if(custom_argv != NULL){
1096
1317
free(custom_argv);
1097
1318
}
1098
1319
1099
if(dir != NULL){
1100
closedir(dir);
1320
free(direntries);
1321
1322
if(dir_fd != -1){
1323
close(dir_fd);
1101
1324
}
1102
1325
1103
1326
/* Kill the processes */
1107
1330
ret = kill(p->pid, SIGTERM);
1108
1331
if(ret == -1 and errno != ESRCH){
1109
1332
/* Set-uid proccesses might not get closed */
1110
perror("kill");
1333
error(0, errno, "kill");
1111
1334
}
1112
1335
}
1113
1336
}
1114
1337
1115
1338
/* Wait for any remaining child processes to terminate */
1116
do{
1339
do {
1117
1340
ret = wait(NULL);
1118
1341
} while(ret >= 0);
1119
1342
if(errno != ECHILD){
1120
perror("wait");
1343
error(0, errno, "wait");
1121
1344
}
1122
1345
1123
1346
free_plugin_list();
1124
1347
1125
1348
free(plugindir);
1349
free(pluginhelperdir);
1126
1350
free(argfile);
1127
1351
1128
1352
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0