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- Committer: Teddy Hogeborn
- Date: 2019-02-11 05:14:10 UTC
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 376.
- Revision ID: teddy@recompile.se-20190211051410-43fmzhy0vlafw2pc
Fix warnings from -Wimplicit-fallthrough
* plugin-runner.c (main/parse_opt): Add __builtin_unreachable() after
calls to argp_state_help().
* plugins.d/askpass-fifo.c (error_plus): Add __builtin_unreachable()
after calls to error().
* plugins.d/mandos-client.c (main/parse_opt) Add
__builtin_unreachable()
after calls to
argp_state_help().
* plugins.d/password-prompt.c: - '' -
* plugin-runner.c (main/parse_opt): Add __builtin_unreachable() after
calls to argp_state_help().
* plugins.d/askpass-fifo.c (error_plus): Add __builtin_unreachable()
after calls to error().
* plugins.d/mandos-client.c (main/parse_opt) Add
__builtin_unreachable()
after calls to
argp_state_help().
* plugins.d/password-prompt.c: - '' -
- files added:
- DBUS-API
- debian/source
- debian/upstream
- 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 © 2008-2018 Teddy Hogeborn
6
* Copyright © 2008-2018 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(), exit(), EXIT_SUCCESS,
30
realloc() */
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,
65
66
SIG_UNBLOCK, kill(), sig_atomic_t
66
67
*/
67
68
#include <errno.h> /* errno, EBADF */
68
#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() */
69
75
70
76
#define BUFFER_SIZE 256
71
77
72
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
73
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
74
81
75
82
const char *argp_program_version = "plugin-runner " VERSION;
76
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
77
84
78
85
typedef struct plugin{
79
86
char *name; /* can be NULL or any plugin name */
82
89
char **environ;
83
90
int envc;
84
91
bool disabled;
85
92
86
93
/* Variables used for running processes*/
87
94
pid_t pid;
88
95
int fd;
99
106
100
107
/* Gets an existing plugin based on name,
101
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
102
110
static plugin *getplugin(char *name){
103
/* Check for exiting plugin with that name */
111
/* Check for existing plugin with that name */
104
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
105
113
if((p->name == name)
106
114
or (p->name and name and (strcmp(p->name, name) == 0))){
108
116
}
109
117
}
110
118
/* Create a new plugin */
111
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);
112
123
if(new_plugin == NULL){
113
124
return NULL;
114
125
}
115
126
char *copy_name = NULL;
116
127
if(name != NULL){
117
copy_name = strdup(name);
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
118
131
if(copy_name == NULL){
132
int e = errno;
119
133
free(new_plugin);
134
errno = e;
120
135
return NULL;
121
136
}
122
137
}
126
141
.disabled = false,
127
142
.next = plugin_list };
128
143
129
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);
130
147
if(new_plugin->argv == NULL){
148
int e = errno;
131
149
free(copy_name);
132
150
free(new_plugin);
151
errno = e;
133
152
return NULL;
134
153
}
135
154
new_plugin->argv[0] = copy_name;
136
155
new_plugin->argv[1] = NULL;
137
156
138
new_plugin->environ = malloc(sizeof(char *));
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
139
160
if(new_plugin->environ == NULL){
161
int e = errno;
140
162
free(copy_name);
141
163
free(new_plugin->argv);
142
164
free(new_plugin);
165
errno = e;
143
166
return NULL;
144
167
}
145
168
new_plugin->environ[0] = NULL;
150
173
}
151
174
152
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
153
177
static bool add_to_char_array(const char *new, char ***array,
154
178
int *len){
155
179
/* Resize the pointed-to array to hold one more pointer */
156
*array = realloc(*array, sizeof(char *)
157
* (size_t) ((*len) + 2));
180
char **new_array = NULL;
181
do {
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
158
185
/* Malloc check */
159
if(*array == NULL){
186
if(new_array == NULL){
160
187
return false;
161
188
}
189
*array = new_array;
162
190
/* Make a copy of the new string */
163
char *copy = strdup(new);
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
164
195
if(copy == NULL){
165
196
return false;
166
197
}
173
204
}
174
205
175
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
176
208
static bool add_argument(plugin *p, const char *arg){
177
209
if(p == NULL){
178
210
return false;
181
213
}
182
214
183
215
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
184
217
static bool add_environment(plugin *p, const char *def, bool replace){
185
218
if(p == NULL){
186
219
return false;
188
221
/* namelen = length of name of environment variable */
189
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
190
223
/* Search for this environment variable */
191
for(char **e = p->environ; *e != NULL; e++){
192
if(strncmp(*e, def, namelen + 1) == 0){
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
193
226
/* It already exists */
194
227
if(replace){
195
char *new = realloc(*e, strlen(def) + 1);
196
if(new == NULL){
228
char *new_envdef;
229
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
197
233
return false;
198
234
}
199
*e = new;
200
strcpy(*e, def);
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
201
237
}
202
238
return true;
203
239
}
205
241
return add_to_char_array(def, &(p->environ), &(p->envc));
206
242
}
207
243
244
#ifndef O_CLOEXEC
208
245
/*
209
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
210
247
* Descriptor Flags".
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
212
249
*/
250
__attribute__((warn_unused_result))
213
251
static int set_cloexec_flag(int fd){
214
int ret = fcntl(fd, F_GETFD, 0);
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
215
253
/* If reading the flags failed, return error indication now. */
216
254
if(ret < 0){
217
255
return ret;
218
256
}
219
257
/* Store modified flag word in the descriptor. */
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
221
260
}
261
#endif /* not O_CLOEXEC */
222
262
223
263
224
264
/* Mark processes as completed when they exit, and save their exit
238
278
/* No child processes */
239
279
break;
240
280
}
241
perror("waitpid");
281
error(0, errno, "waitpid");
242
282
}
243
283
244
284
/* A child exited, find it in process_list */
256
296
}
257
297
258
298
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
259
300
static bool print_out_password(const char *buffer, size_t length){
260
301
ssize_t ret;
261
302
for(size_t written = 0; written < length; written += (size_t)ret){
269
310
}
270
311
271
312
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
272
314
static void free_plugin(plugin *plugin_node){
273
315
274
316
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
280
322
}
281
323
free(plugin_node->environ);
282
324
free(plugin_node->buffer);
283
325
284
326
/* Removes the plugin from the singly-linked list */
285
327
if(plugin_node == plugin_list){
286
328
/* First one - simple */
306
348
307
349
int main(int argc, char *argv[]){
308
350
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
309
352
char *argfile = NULL;
310
353
FILE *conffp;
311
size_t d_name_len;
312
DIR *dir = NULL;
313
struct dirent *dirst;
354
struct dirent **direntries = NULL;
314
355
struct stat st;
315
356
fd_set rfds_all;
316
int ret, numchars, maxfd = 0;
357
int ret, maxfd = 0;
317
358
ssize_t sret;
318
intmax_t tmpmax;
319
359
uid_t uid = 65534;
320
360
gid_t gid = 65534;
321
361
bool debug = false;
325
365
.sa_flags = SA_NOCLDSTOP };
326
366
char **custom_argv = NULL;
327
367
int custom_argc = 0;
368
int dir_fd = -1;
328
369
329
370
/* Establish a signal handler */
330
371
sigemptyset(&sigchld_action.sa_mask);
331
372
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
332
373
if(ret == -1){
333
perror("sigaddset");
334
exitstatus = EXIT_FAILURE;
374
error(0, errno, "sigaddset");
375
exitstatus = EX_OSERR;
335
376
goto fallback;
336
377
}
337
378
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
338
379
if(ret == -1){
339
perror("sigaction");
340
exitstatus = EXIT_FAILURE;
380
error(0, errno, "sigaction");
381
exitstatus = EX_OSERR;
341
382
goto fallback;
342
383
}
343
384
375
416
.doc = "Group ID the plugins will run as", .group = 3 },
376
417
{ .name = "debug", .key = 132,
377
418
.doc = "Debug mode", .group = 4 },
419
{ .name = "plugin-helper-dir", .key = 133,
420
.arg = "DIRECTORY",
421
.doc = "Specify a different plugin helper directory",
422
.group = 2 },
423
/*
424
* These reproduce what we would get without ARGP_NO_HELP
425
*/
426
{ .name = "help", .key = '?',
427
.doc = "Give this help list", .group = -1 },
428
{ .name = "usage", .key = -3,
429
.doc = "Give a short usage message", .group = -1 },
430
{ .name = "version", .key = 'V',
431
.doc = "Print program version", .group = -1 },
378
432
{ .name = NULL }
379
433
};
380
434
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
435
__attribute__((nonnull(3)))
436
error_t parse_opt(int key, char *arg, struct argp_state *state){
437
errno = 0;
383
438
switch(key){
439
char *tmp;
440
intmax_t tmp_id;
384
441
case 'g': /* --global-options */
385
if(arg != NULL){
442
{
386
443
char *plugin_option;
387
444
while((plugin_option = strsep(&arg, ",")) != NULL){
388
if(plugin_option[0] == '\0'){
389
continue;
390
}
391
445
if(not add_argument(getplugin(NULL), plugin_option)){
392
perror("add_argument");
393
return ARGP_ERR_UNKNOWN;
446
break;
394
447
}
395
448
}
449
errno = 0;
396
450
}
397
451
break;
398
452
case 'G': /* --global-env */
399
if(arg == NULL){
400
break;
401
}
402
if(not add_environment(getplugin(NULL), arg, true)){
403
perror("add_environment");
453
if(add_environment(getplugin(NULL), arg, true)){
454
errno = 0;
404
455
}
405
456
break;
406
457
case 'o': /* --options-for */
407
if(arg != NULL){
408
char *plugin_name = strsep(&arg, ":");
409
if(plugin_name[0] == '\0'){
410
break;
411
}
412
char *plugin_option;
413
while((plugin_option = strsep(&arg, ",")) != NULL){
414
if(not add_argument(getplugin(plugin_name), plugin_option)){
415
perror("add_argument");
416
return ARGP_ERR_UNKNOWN;
458
{
459
char *option_list = strchr(arg, ':');
460
if(option_list == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
463
break;
464
}
465
*option_list = '\0';
466
option_list++;
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
471
}
472
char *option;
473
while((option = strsep(&option_list, ",")) != NULL){
474
if(not add_argument(getplugin(arg), option)){
475
break;
417
476
}
418
477
}
478
errno = 0;
419
479
}
420
480
break;
421
481
case 'E': /* --env-for */
422
if(arg == NULL){
423
break;
424
}
425
482
{
426
483
char *envdef = strchr(arg, ':');
427
484
if(envdef == NULL){
485
argp_error(state, "No colon in \"%s\"", arg);
486
errno = EINVAL;
428
487
break;
429
488
}
430
489
*envdef = '\0';
431
if(not add_environment(getplugin(arg), envdef+1, true)){
432
perror("add_environment");
490
envdef++;
491
if(arg[0] == '\0'){
492
argp_error(state, "Empty plugin name");
493
errno = EINVAL;
494
break;
495
}
496
if(add_environment(getplugin(arg), envdef, true)){
497
errno = 0;
433
498
}
434
499
}
435
500
break;
436
501
case 'd': /* --disable */
437
if(arg != NULL){
502
{
438
503
plugin *p = getplugin(arg);
439
if(p == NULL){
440
return ARGP_ERR_UNKNOWN;
504
if(p != NULL){
505
p->disabled = true;
506
errno = 0;
441
507
}
442
p->disabled = true;
443
508
}
444
509
break;
445
510
case 'e': /* --enable */
446
if(arg != NULL){
511
{
447
512
plugin *p = getplugin(arg);
448
if(p == NULL){
449
return ARGP_ERR_UNKNOWN;
513
if(p != NULL){
514
p->disabled = false;
515
errno = 0;
450
516
}
451
p->disabled = false;
452
517
}
453
518
break;
454
519
case 128: /* --plugin-dir */
455
520
free(plugindir);
456
521
plugindir = strdup(arg);
457
if(plugindir == NULL){
458
perror("strdup");
459
}
522
if(plugindir != NULL){
523
errno = 0;
524
}
460
525
break;
461
526
case 129: /* --config-file */
462
527
/* This is already done by parse_opt_config_file() */
463
528
break;
464
529
case 130: /* --userid */
465
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
466
if(ret < 1 or tmpmax != (uid_t)tmpmax
467
or arg[numchars] != '\0'){
468
fprintf(stderr, "Bad user ID number: \"%s\", using %"
469
PRIdMAX "\n", arg, (intmax_t)uid);
470
} else {
471
uid = (uid_t)tmpmax;
530
tmp_id = strtoimax(arg, &tmp, 10);
531
if(errno != 0 or tmp == arg or *tmp != '\0'
532
or tmp_id != (uid_t)tmp_id){
533
argp_error(state, "Bad user ID number: \"%s\", using %"
534
PRIdMAX, arg, (intmax_t)uid);
535
break;
472
536
}
537
uid = (uid_t)tmp_id;
538
errno = 0;
473
539
break;
474
540
case 131: /* --groupid */
475
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
476
if(ret < 1 or tmpmax != (gid_t)tmpmax
477
or arg[numchars] != '\0'){
478
fprintf(stderr, "Bad group ID number: \"%s\", using %"
479
PRIdMAX "\n", arg, (intmax_t)gid);
480
} else {
481
gid = (gid_t)tmpmax;
541
tmp_id = strtoimax(arg, &tmp, 10);
542
if(errno != 0 or tmp == arg or *tmp != '\0'
543
or tmp_id != (gid_t)tmp_id){
544
argp_error(state, "Bad group ID number: \"%s\", using %"
545
PRIdMAX, arg, (intmax_t)gid);
546
break;
482
547
}
548
gid = (gid_t)tmp_id;
549
errno = 0;
483
550
break;
484
551
case 132: /* --debug */
485
552
debug = true;
486
553
break;
554
case 133: /* --plugin-helper-dir */
555
free(pluginhelperdir);
556
pluginhelperdir = strdup(arg);
557
if(pluginhelperdir != NULL){
558
errno = 0;
559
}
560
break;
561
/*
562
* These reproduce what we would get without ARGP_NO_HELP
563
*/
564
case '?': /* --help */
565
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
566
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
567
__builtin_unreachable();
568
case -3: /* --usage */
569
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
570
argp_state_help(state, state->out_stream,
571
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
572
__builtin_unreachable();
573
case 'V': /* --version */
574
fprintf(state->out_stream, "%s\n", argp_program_version);
575
exit(EXIT_SUCCESS);
576
break;
487
577
/*
488
578
* When adding more options before this line, remember to also add a
489
579
* "case" to the "parse_opt_config_file" function below.
492
582
/* Cryptsetup always passes an argument, which is an empty
493
583
string if "none" was specified in /etc/crypttab. So if
494
584
argument was empty, we ignore it silently. */
495
if(arg[0] != '\0'){
496
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
585
if(arg[0] == '\0'){
586
break;
497
587
}
498
break;
499
case ARGP_KEY_END:
500
break;
588
/* FALLTHROUGH */
501
589
default:
502
590
return ARGP_ERR_UNKNOWN;
503
591
}
504
return 0;
592
return errno; /* Set to 0 at start */
505
593
}
506
594
507
595
/* This option parser is the same as parse_opt() above, except it
509
597
error_t parse_opt_config_file(int key, char *arg,
510
598
__attribute__((unused))
511
599
struct argp_state *state){
600
errno = 0;
512
601
switch(key){
513
602
case 'g': /* --global-options */
514
603
case 'G': /* --global-env */
521
610
case 129: /* --config-file */
522
611
free(argfile);
523
612
argfile = strdup(arg);
524
if(argfile == NULL){
525
perror("strdup");
613
if(argfile != NULL){
614
errno = 0;
526
615
}
527
break;
616
break;
528
617
case 130: /* --userid */
529
618
case 131: /* --groupid */
530
619
case 132: /* --debug */
620
case 133: /* --plugin-helper-dir */
621
case '?': /* --help */
622
case -3: /* --usage */
623
case 'V': /* --version */
531
624
case ARGP_KEY_ARG:
532
case ARGP_KEY_END:
533
625
break;
534
626
default:
535
627
return ARGP_ERR_UNKNOWN;
536
628
}
537
return 0;
629
return errno;
538
630
}
539
631
540
632
struct argp argp = { .options = options,
544
636
545
637
/* Parse using parse_opt_config_file() in order to get the custom
546
638
config file location, if any. */
547
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
548
if(ret == ARGP_ERR_UNKNOWN){
549
fprintf(stderr, "Unknown error while parsing arguments\n");
550
exitstatus = EXIT_FAILURE;
639
ret = argp_parse(&argp, argc, argv,
640
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
641
NULL, NULL);
642
switch(ret){
643
case 0:
644
break;
645
case ENOMEM:
646
default:
647
errno = ret;
648
error(0, errno, "argp_parse");
649
exitstatus = EX_OSERR;
650
goto fallback;
651
case EINVAL:
652
exitstatus = EX_USAGE;
551
653
goto fallback;
552
654
}
553
655
559
661
conffp = fopen(AFILE, "r");
560
662
} else {
561
663
conffp = fopen(argfile, "r");
562
}
664
}
563
665
if(conffp != NULL){
564
666
char *org_line = NULL;
565
667
char *p, *arg, *new_arg, *line;
566
668
size_t size = 0;
567
669
const char whitespace_delims[] = " \r\t\f\v\n";
568
670
const char comment_delim[] = "#";
569
671
570
672
custom_argc = 1;
571
673
custom_argv = malloc(sizeof(char*) * 2);
572
674
if(custom_argv == NULL){
573
perror("malloc");
574
exitstatus = EXIT_FAILURE;
675
error(0, errno, "malloc");
676
exitstatus = EX_OSERR;
575
677
goto fallback;
576
678
}
577
679
custom_argv[0] = argv[0];
578
680
custom_argv[1] = NULL;
579
681
580
682
/* for each line in the config file, strip whitespace and ignore
581
683
commented text */
582
684
while(true){
584
686
if(sret == -1){
585
687
break;
586
688
}
587
689
588
690
line = org_line;
589
691
arg = strsep(&line, comment_delim);
590
692
while((p = strsep(&arg, whitespace_delims)) != NULL){
593
695
}
594
696
new_arg = strdup(p);
595
697
if(new_arg == NULL){
596
perror("strdup");
597
exitstatus = EXIT_FAILURE;
698
error(0, errno, "strdup");
699
exitstatus = EX_OSERR;
598
700
free(org_line);
599
701
goto fallback;
600
702
}
601
703
602
704
custom_argc += 1;
603
custom_argv = realloc(custom_argv, sizeof(char *)
604
* ((unsigned int) custom_argc + 1));
605
if(custom_argv == NULL){
606
perror("realloc");
607
exitstatus = EXIT_FAILURE;
608
free(org_line);
609
goto fallback;
705
{
706
char **new_argv = realloc(custom_argv, sizeof(char *)
707
* ((size_t)custom_argc + 1));
708
if(new_argv == NULL){
709
error(0, errno, "realloc");
710
exitstatus = EX_OSERR;
711
free(new_arg);
712
free(org_line);
713
goto fallback;
714
} else {
715
custom_argv = new_argv;
716
}
610
717
}
611
718
custom_argv[custom_argc-1] = new_arg;
612
custom_argv[custom_argc] = NULL;
719
custom_argv[custom_argc] = NULL;
613
720
}
614
721
}
722
do {
723
ret = fclose(conffp);
724
} while(ret == EOF and errno == EINTR);
725
if(ret == EOF){
726
error(0, errno, "fclose");
727
exitstatus = EX_IOERR;
728
goto fallback;
729
}
615
730
free(org_line);
616
731
} else {
617
732
/* Check for harmful errors and go to fallback. Other errors might
618
733
not affect opening plugins */
619
734
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
620
perror("fopen");
621
exitstatus = EXIT_FAILURE;
735
error(0, errno, "fopen");
736
exitstatus = EX_OSERR;
622
737
goto fallback;
623
738
}
624
739
}
625
/* If there was any arguments from configuration file,
626
pass them to parser as command arguments */
740
/* If there were any arguments from the configuration file, pass
741
them to parser as command line arguments */
627
742
if(custom_argv != NULL){
628
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
629
0, NULL);
630
if(ret == ARGP_ERR_UNKNOWN){
631
fprintf(stderr, "Unknown error while parsing arguments\n");
632
exitstatus = EXIT_FAILURE;
743
ret = argp_parse(&argp, custom_argc, custom_argv,
744
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
745
NULL, NULL);
746
switch(ret){
747
case 0:
748
break;
749
case ENOMEM:
750
default:
751
errno = ret;
752
error(0, errno, "argp_parse");
753
exitstatus = EX_OSERR;
754
goto fallback;
755
case EINVAL:
756
exitstatus = EX_CONFIG;
633
757
goto fallback;
634
758
}
635
759
}
636
760
637
761
/* Parse actual command line arguments, to let them override the
638
762
config file */
639
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
640
if(ret == ARGP_ERR_UNKNOWN){
641
fprintf(stderr, "Unknown error while parsing arguments\n");
642
exitstatus = EXIT_FAILURE;
643
goto fallback;
763
ret = argp_parse(&argp, argc, argv,
764
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
765
NULL, NULL);
766
switch(ret){
767
case 0:
768
break;
769
case ENOMEM:
770
default:
771
errno = ret;
772
error(0, errno, "argp_parse");
773
exitstatus = EX_OSERR;
774
goto fallback;
775
case EINVAL:
776
exitstatus = EX_USAGE;
777
goto fallback;
778
}
779
780
{
781
char *pluginhelperenv;
782
bool bret = true;
783
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
784
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
785
if(ret != -1){
786
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
787
}
788
if(ret == -1 or not bret){
789
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
790
" environment variable to \"%s\" for all plugins\n",
791
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
792
}
793
if(ret != -1){
794
free(pluginhelperenv);
795
}
644
796
}
645
797
646
798
if(debug){
647
for(plugin *p = plugin_list; p != NULL; p=p->next){
799
for(plugin *p = plugin_list; p != NULL; p = p->next){
648
800
fprintf(stderr, "Plugin: %s has %d arguments\n",
649
801
p->name ? p->name : "Global", p->argc - 1);
650
802
for(char **a = p->argv; *a != NULL; a++){
657
809
}
658
810
}
659
811
660
/* Strip permissions down to nobody */
661
setgid(gid);
812
if(getuid() == 0){
813
/* Work around Debian bug #633582:
814
<https://bugs.debian.org/633582> */
815
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
816
if(plugindir_fd == -1){
817
if(errno != ENOENT){
818
error(0, errno, "open(\"" PDIR "\")");
819
}
820
} else {
821
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
822
if(ret == -1){
823
error(0, errno, "fstat");
824
} else {
825
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
826
ret = fchown(plugindir_fd, uid, gid);
827
if(ret == -1){
828
error(0, errno, "fchown");
829
}
830
}
831
}
832
close(plugindir_fd);
833
}
834
}
835
836
/* Lower permissions */
837
ret = setgid(gid);
662
838
if(ret == -1){
663
perror("setgid");
839
error(0, errno, "setgid");
664
840
}
665
841
ret = setuid(uid);
666
842
if(ret == -1){
667
perror("setuid");
668
}
669
670
if(plugindir == NULL){
671
dir = opendir(PDIR);
672
} else {
673
dir = opendir(plugindir);
674
}
675
676
if(dir == NULL){
677
perror("Could not open plugin dir");
678
exitstatus = EXIT_FAILURE;
679
goto fallback;
680
}
681
682
/* Set the FD_CLOEXEC flag on the directory, if possible */
843
error(0, errno, "setuid");
844
}
845
846
/* Open plugin directory with close_on_exec flag */
683
847
{
684
int dir_fd = dirfd(dir);
685
if(dir_fd >= 0){
686
ret = set_cloexec_flag(dir_fd);
687
if(ret < 0){
688
perror("set_cloexec_flag");
689
exitstatus = EXIT_FAILURE;
690
goto fallback;
848
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
849
#ifdef O_CLOEXEC
850
O_CLOEXEC
851
#else /* not O_CLOEXEC */
852
0
853
#endif /* not O_CLOEXEC */
854
);
855
if(dir_fd == -1){
856
error(0, errno, "Could not open plugin dir");
857
exitstatus = EX_UNAVAILABLE;
858
goto fallback;
859
}
860
861
#ifndef O_CLOEXEC
862
/* Set the FD_CLOEXEC flag on the directory */
863
ret = set_cloexec_flag(dir_fd);
864
if(ret < 0){
865
error(0, errno, "set_cloexec_flag");
866
exitstatus = EX_OSERR;
867
goto fallback;
868
}
869
#endif /* O_CLOEXEC */
870
}
871
872
int good_name(const struct dirent * const dirent){
873
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
874
"*.dpkg-old", "*.dpkg-bak",
875
"*.dpkg-divert", NULL };
876
#ifdef __GNUC__
877
#pragma GCC diagnostic push
878
#pragma GCC diagnostic ignored "-Wcast-qual"
879
#endif
880
for(const char **pat = (const char **)patterns;
881
*pat != NULL; pat++){
882
#ifdef __GNUC__
883
#pragma GCC diagnostic pop
884
#endif
885
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
886
!= FNM_NOMATCH){
887
if(debug){
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
" matching pattern %s\n", dirent->d_name, *pat);
890
}
891
return 0;
691
892
}
692
893
}
894
return 1;
895
}
896
897
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
898
alphasort);
899
if(numplugins == -1){
900
error(0, errno, "Could not scan plugin dir");
901
direntries = NULL;
902
exitstatus = EX_OSERR;
903
goto fallback;
693
904
}
694
905
695
906
FD_ZERO(&rfds_all);
696
907
697
908
/* Read and execute any executable in the plugin directory*/
698
while(true){
699
dirst = readdir(dir);
700
701
/* All directory entries have been processed */
702
if(dirst == NULL){
703
if(errno == EBADF){
704
perror("readdir");
705
exitstatus = EXIT_FAILURE;
706
goto fallback;
707
}
708
break;
709
}
710
711
d_name_len = strlen(dirst->d_name);
712
713
/* Ignore dotfiles, backup files and other junk */
714
{
715
bool bad_name = false;
716
717
const char const *bad_prefixes[] = { ".", "#", NULL };
718
719
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
720
".dpkg-old",
721
".dpkg-bak",
722
".dpkg-divert", NULL };
723
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
724
size_t pre_len = strlen(*pre);
725
if((d_name_len >= pre_len)
726
and strncmp((dirst->d_name), *pre, pre_len) == 0){
727
if(debug){
728
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
729
" with bad prefix %s\n", dirst->d_name, *pre);
730
}
731
bad_name = true;
732
break;
733
}
734
}
735
if(bad_name){
736
continue;
737
}
738
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
739
size_t suf_len = strlen(*suf);
740
if((d_name_len >= suf_len)
741
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
742
== 0)){
743
if(debug){
744
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
745
" with bad suffix %s\n", dirst->d_name, *suf);
746
}
747
bad_name = true;
748
break;
749
}
750
}
751
752
if(bad_name){
753
continue;
754
}
755
}
756
757
char *filename;
758
if(plugindir == NULL){
759
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
760
} else {
761
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
762
}
763
if(ret < 0){
764
perror("asprintf");
909
for(int i = 0; i < numplugins; i++){
910
911
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
912
if(plugin_fd == -1){
913
error(0, errno, "Could not open plugin");
914
free(direntries[i]);
765
915
continue;
766
916
}
767
768
ret = stat(filename, &st);
917
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
769
918
if(ret == -1){
770
perror("stat");
771
free(filename);
919
error(0, errno, "stat");
920
close(plugin_fd);
921
free(direntries[i]);
772
922
continue;
773
923
}
774
924
775
925
/* Ignore non-executable files */
776
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
926
if(not S_ISREG(st.st_mode)
927
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
928
X_OK, 0)) != 0)){
777
929
if(debug){
778
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
779
" with bad type or mode\n", filename);
930
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
931
" with bad type or mode\n",
932
plugindir != NULL ? plugindir : PDIR,
933
direntries[i]->d_name);
780
934
}
781
free(filename);
935
close(plugin_fd);
936
free(direntries[i]);
782
937
continue;
783
938
}
784
939
785
plugin *p = getplugin(dirst->d_name);
940
plugin *p = getplugin(direntries[i]->d_name);
786
941
if(p == NULL){
787
perror("getplugin");
788
free(filename);
942
error(0, errno, "getplugin");
943
close(plugin_fd);
944
free(direntries[i]);
789
945
continue;
790
946
}
791
947
if(p->disabled){
792
948
if(debug){
793
949
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
794
dirst->d_name);
950
direntries[i]->d_name);
795
951
}
796
free(filename);
952
close(plugin_fd);
953
free(direntries[i]);
797
954
continue;
798
955
}
799
956
{
802
959
if(g != NULL){
803
960
for(char **a = g->argv + 1; *a != NULL; a++){
804
961
if(not add_argument(p, *a)){
805
perror("add_argument");
962
error(0, errno, "add_argument");
806
963
}
807
964
}
808
965
/* Add global environment variables */
809
966
for(char **e = g->environ; *e != NULL; e++){
810
967
if(not add_environment(p, *e, false)){
811
perror("add_environment");
968
error(0, errno, "add_environment");
812
969
}
813
970
}
814
971
}
815
972
}
816
/* If this plugin has any environment variables, we will call
817
using execve and need to duplicate the environment from this
818
process, too. */
973
/* If this plugin has any environment variables, we need to
974
duplicate the environment from this process, too. */
819
975
if(p->environ[0] != NULL){
820
976
for(char **e = environ; *e != NULL; e++){
821
977
if(not add_environment(p, *e, false)){
822
perror("add_environment");
978
error(0, errno, "add_environment");
823
979
}
824
980
}
825
981
}
826
982
827
983
int pipefd[2];
828
ret = pipe(pipefd);
984
#ifndef O_CLOEXEC
985
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
986
#else /* O_CLOEXEC */
987
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
988
#endif /* O_CLOEXEC */
829
989
if(ret == -1){
830
perror("pipe");
831
exitstatus = EXIT_FAILURE;
832
goto fallback;
833
}
990
error(0, errno, "pipe");
991
exitstatus = EX_OSERR;
992
free(direntries[i]);
993
goto fallback;
994
}
995
if(pipefd[0] >= FD_SETSIZE){
996
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
997
FD_SETSIZE);
998
close(pipefd[0]);
999
close(pipefd[1]);
1000
exitstatus = EX_OSERR;
1001
free(direntries[i]);
1002
goto fallback;
1003
}
1004
#ifndef O_CLOEXEC
834
1005
/* Ask OS to automatic close the pipe on exec */
835
1006
ret = set_cloexec_flag(pipefd[0]);
836
1007
if(ret < 0){
837
perror("set_cloexec_flag");
838
exitstatus = EXIT_FAILURE;
1008
error(0, errno, "set_cloexec_flag");
1009
close(pipefd[0]);
1010
close(pipefd[1]);
1011
exitstatus = EX_OSERR;
1012
free(direntries[i]);
839
1013
goto fallback;
840
1014
}
841
1015
ret = set_cloexec_flag(pipefd[1]);
842
1016
if(ret < 0){
843
perror("set_cloexec_flag");
844
exitstatus = EXIT_FAILURE;
1017
error(0, errno, "set_cloexec_flag");
1018
close(pipefd[0]);
1019
close(pipefd[1]);
1020
exitstatus = EX_OSERR;
1021
free(direntries[i]);
845
1022
goto fallback;
846
1023
}
1024
#endif /* not O_CLOEXEC */
847
1025
/* Block SIGCHLD until process is safely in process list */
848
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1026
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1027
&sigchld_action.sa_mask,
1028
NULL));
849
1029
if(ret < 0){
850
perror("sigprocmask");
851
exitstatus = EXIT_FAILURE;
1030
error(0, errno, "sigprocmask");
1031
exitstatus = EX_OSERR;
1032
free(direntries[i]);
852
1033
goto fallback;
853
1034
}
854
1035
/* Starting a new process to be watched */
855
pid_t pid = fork();
1036
pid_t pid;
1037
do {
1038
pid = fork();
1039
} while(pid == -1 and errno == EINTR);
856
1040
if(pid == -1){
857
perror("fork");
858
exitstatus = EXIT_FAILURE;
1041
error(0, errno, "fork");
1042
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1043
&sigchld_action.sa_mask, NULL));
1044
close(pipefd[0]);
1045
close(pipefd[1]);
1046
exitstatus = EX_OSERR;
1047
free(direntries[i]);
859
1048
goto fallback;
860
1049
}
861
1050
if(pid == 0){
862
1051
/* this is the child process */
863
1052
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
864
1053
if(ret < 0){
865
perror("sigaction");
866
_exit(EXIT_FAILURE);
1054
error(0, errno, "sigaction");
1055
_exit(EX_OSERR);
867
1056
}
868
1057
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
869
1058
if(ret < 0){
870
perror("sigprocmask");
871
_exit(EXIT_FAILURE);
1059
error(0, errno, "sigprocmask");
1060
_exit(EX_OSERR);
872
1061
}
873
1062
874
1063
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
875
1064
if(ret == -1){
876
perror("dup2");
877
_exit(EXIT_FAILURE);
1065
error(0, errno, "dup2");
1066
_exit(EX_OSERR);
878
1067
}
879
1068
880
if(dirfd(dir) < 0){
881
/* If dir has no file descriptor, we could not set FD_CLOEXEC
882
above and must now close it manually here. */
883
closedir(dir);
884
}
885
if(p->environ[0] == NULL){
886
if(execv(filename, p->argv) < 0){
887
perror("execv");
888
_exit(EXIT_FAILURE);
889
}
890
} else {
891
if(execve(filename, p->argv, p->environ) < 0){
892
perror("execve");
893
_exit(EXIT_FAILURE);
894
}
1069
if(fexecve(plugin_fd, p->argv,
1070
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1071
error(0, errno, "fexecve for %s/%s",
1072
plugindir != NULL ? plugindir : PDIR,
1073
direntries[i]->d_name);
1074
_exit(EX_OSERR);
895
1075
}
896
1076
/* no return */
897
1077
}
898
1078
/* Parent process */
899
1079
close(pipefd[1]); /* Close unused write end of pipe */
900
free(filename);
901
plugin *new_plugin = getplugin(dirst->d_name);
1080
close(plugin_fd);
1081
plugin *new_plugin = getplugin(direntries[i]->d_name);
902
1082
if(new_plugin == NULL){
903
perror("getplugin");
904
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1083
error(0, errno, "getplugin");
1084
ret = (int)(TEMP_FAILURE_RETRY
1085
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1086
NULL)));
905
1087
if(ret < 0){
906
perror("sigprocmask");
1088
error(0, errno, "sigprocmask");
907
1089
}
908
exitstatus = EXIT_FAILURE;
1090
exitstatus = EX_OSERR;
1091
free(direntries[i]);
909
1092
goto fallback;
910
1093
}
1094
free(direntries[i]);
911
1095
912
1096
new_plugin->pid = pid;
913
1097
new_plugin->fd = pipefd[0];
914
1098
1099
if(debug){
1100
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1101
new_plugin->name, (intmax_t) (new_plugin->pid));
1102
}
1103
915
1104
/* Unblock SIGCHLD so signal handler can be run if this process
916
1105
has already completed */
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1106
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1107
&sigchld_action.sa_mask,
1108
NULL));
918
1109
if(ret < 0){
919
perror("sigprocmask");
920
exitstatus = EXIT_FAILURE;
1110
error(0, errno, "sigprocmask");
1111
exitstatus = EX_OSERR;
921
1112
goto fallback;
922
1113
}
923
1114
928
1119
}
929
1120
}
930
1121
931
closedir(dir);
932
dir = NULL;
1122
free(direntries);
1123
direntries = NULL;
1124
close(dir_fd);
1125
dir_fd = -1;
933
1126
free_plugin(getplugin(NULL));
934
1127
935
1128
for(plugin *p = plugin_list; p != NULL; p = p->next){
947
1140
while(plugin_list){
948
1141
fd_set rfds = rfds_all;
949
1142
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
950
if(select_ret == -1){
951
perror("select");
952
exitstatus = EXIT_FAILURE;
1143
if(select_ret == -1 and errno != EINTR){
1144
error(0, errno, "select");
1145
exitstatus = EX_OSERR;
953
1146
goto fallback;
954
1147
}
955
1148
/* OK, now either a process completed, or something can be read
961
1154
if(not WIFEXITED(proc->status)
962
1155
or WEXITSTATUS(proc->status) != 0){
963
1156
/* Bad exit by plugin */
964
1157
965
1158
if(debug){
966
1159
if(WIFEXITED(proc->status)){
967
1160
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
970
1163
WEXITSTATUS(proc->status));
971
1164
} else if(WIFSIGNALED(proc->status)){
972
1165
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
973
" signal %d\n", proc->name,
1166
" signal %d: %s\n", proc->name,
974
1167
(intmax_t) (proc->pid),
975
WTERMSIG(proc->status));
976
} else if(WCOREDUMP(proc->status)){
977
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
978
" core\n", proc->name, (intmax_t) (proc->pid));
1168
WTERMSIG(proc->status),
1169
strsignal(WTERMSIG(proc->status)));
979
1170
}
980
1171
}
981
1172
982
1173
/* Remove the plugin */
983
1174
FD_CLR(proc->fd, &rfds_all);
984
1175
985
1176
/* Block signal while modifying process_list */
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1177
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1178
(SIG_BLOCK,
1179
&sigchld_action.sa_mask,
1180
NULL));
987
1181
if(ret < 0){
988
perror("sigprocmask");
989
exitstatus = EXIT_FAILURE;
1182
error(0, errno, "sigprocmask");
1183
exitstatus = EX_OSERR;
990
1184
goto fallback;
991
1185
}
992
1186
995
1189
proc = next_plugin;
996
1190
997
1191
/* We are done modifying process list, so unblock signal */
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
1192
ret = (int)(TEMP_FAILURE_RETRY
1193
(sigprocmask(SIG_UNBLOCK,
1194
&sigchld_action.sa_mask, NULL)));
1000
1195
if(ret < 0){
1001
perror("sigprocmask");
1002
exitstatus = EXIT_FAILURE;
1196
error(0, errno, "sigprocmask");
1197
exitstatus = EX_OSERR;
1003
1198
goto fallback;
1004
1199
}
1005
1200
1015
1210
bool bret = print_out_password(proc->buffer,
1016
1211
proc->buffer_length);
1017
1212
if(not bret){
1018
perror("print_out_password");
1019
exitstatus = EXIT_FAILURE;
1213
error(0, errno, "print_out_password");
1214
exitstatus = EX_IOERR;
1020
1215
}
1021
1216
goto fallback;
1022
1217
}
1029
1224
}
1030
1225
/* Before reading, make the process' data buffer large enough */
1031
1226
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1032
proc->buffer = realloc(proc->buffer, proc->buffer_size
1033
+ (size_t) BUFFER_SIZE);
1034
if(proc->buffer == NULL){
1035
perror("malloc");
1036
exitstatus = EXIT_FAILURE;
1227
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1228
+ (size_t) BUFFER_SIZE);
1229
if(new_buffer == NULL){
1230
error(0, errno, "malloc");
1231
exitstatus = EX_OSERR;
1037
1232
goto fallback;
1038
1233
}
1234
proc->buffer = new_buffer;
1039
1235
proc->buffer_size += BUFFER_SIZE;
1040
1236
}
1041
1237
/* Read from the process */
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1238
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1239
proc->buffer
1240
+ proc->buffer_length,
1241
BUFFER_SIZE));
1044
1242
if(sret < 0){
1045
1243
/* Read error from this process; ignore the error */
1046
1244
proc = proc->next;
1054
1252
}
1055
1253
}
1056
1254
}
1057
1058
1255
1256
1059
1257
fallback:
1060
1258
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1259
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1260
and exitstatus != EX_OK)){
1062
1261
/* Fallback if all plugins failed, none are found or an error
1063
1262
occured */
1064
1263
bool bret;
1072
1271
}
1073
1272
bret = print_out_password(passwordbuffer, len);
1074
1273
if(not bret){
1075
perror("print_out_password");
1076
exitstatus = EXIT_FAILURE;
1274
error(0, errno, "print_out_password");
1275
exitstatus = EX_IOERR;
1077
1276
}
1078
1277
}
1079
1278
1080
1279
/* Restore old signal handler */
1081
1280
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1082
1281
if(ret == -1){
1083
perror("sigaction");
1084
exitstatus = EXIT_FAILURE;
1282
error(0, errno, "sigaction");
1283
exitstatus = EX_OSERR;
1085
1284
}
1086
1285
1087
1286
if(custom_argv != NULL){
1091
1290
free(custom_argv);
1092
1291
}
1093
1292
1094
if(dir != NULL){
1095
closedir(dir);
1293
free(direntries);
1294
1295
if(dir_fd != -1){
1296
close(dir_fd);
1096
1297
}
1097
1298
1098
1299
/* Kill the processes */
1102
1303
ret = kill(p->pid, SIGTERM);
1103
1304
if(ret == -1 and errno != ESRCH){
1104
1305
/* Set-uid proccesses might not get closed */
1105
perror("kill");
1306
error(0, errno, "kill");
1106
1307
}
1107
1308
}
1108
1309
}
1109
1310
1110
1311
/* Wait for any remaining child processes to terminate */
1111
do{
1312
do {
1112
1313
ret = wait(NULL);
1113
1314
} while(ret >= 0);
1114
1315
if(errno != ECHILD){
1115
perror("wait");
1316
error(0, errno, "wait");
1116
1317
}
1117
1318
1118
1319
free_plugin_list();
1119
1320
1120
1321
free(plugindir);
1322
free(pluginhelperdir);
1121
1323
free(argfile);
1122
1324
1123
1325
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0