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- Committer: Björn Påhlsson
- Date: 2009-02-09 02:05:15 UTC
- mfrom: (237.2.67 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 250.
- Revision ID: belorn@braxen-20090209020515-t3s2syhptlm0doda
merge
- files added:
- initramfs-tools-hook-conf
- files removed:
- DBUS-API
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
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
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
16
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
16
* General Public License for more details.
19
17
*
20
18
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
22
21
*
23
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
24
23
*/
25
24
26
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
27
O_CLOEXEC, pipe2() */
26
asprintf() */
28
27
#include <stddef.h> /* size_t, NULL */
29
#include <stdlib.h> /* malloc(), reallocarray(), realloc(),
30
EXIT_SUCCESS, exit() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
31
30
#include <stdbool.h> /* bool, true, false */
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() */
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() */
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(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
41
WEXITSTATUS() */
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
43
#include <iso646.h> /* and, or, not */
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
*/
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() */
52
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
54
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
57
56
#include <errno.h> /* errno */
58
57
#include <argp.h> /* struct argp_option, struct
59
58
argp_state, struct argp,
63
62
#include <signal.h> /* struct sigaction, sigemptyset(),
64
63
sigaddset(), sigaction(),
65
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
65
SIG_UNBLOCK, kill() */
68
66
#include <errno.h> /* errno, EBADF */
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() */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
75
68
76
69
#define BUFFER_SIZE 256
77
70
78
71
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
73
82
74
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
84
76
85
77
typedef struct plugin{
86
78
char *name; /* can be NULL or any plugin name */
89
81
char **environ;
90
82
int envc;
91
83
bool disabled;
92
84
93
85
/* Variables used for running processes*/
94
86
pid_t pid;
95
87
int fd;
106
98
107
99
/* Gets an existing plugin based on name,
108
100
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
101
static plugin *getplugin(char *name){
111
/* Check for existing plugin with that name */
102
/* Check for exiting plugin with that name */
112
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
104
if((p->name == name)
114
105
or (p->name and name and (strcmp(p->name, name) == 0))){
116
107
}
117
108
}
118
109
/* Create a new plugin */
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
110
plugin *new_plugin = malloc(sizeof(plugin));
123
111
if(new_plugin == NULL){
124
112
return NULL;
125
113
}
126
114
char *copy_name = NULL;
127
115
if(name != NULL){
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
131
117
if(copy_name == NULL){
132
int e = errno;
133
118
free(new_plugin);
134
errno = e;
135
119
return NULL;
136
120
}
137
121
}
141
125
.disabled = false,
142
126
.next = plugin_list };
143
127
144
do {
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
128
new_plugin->argv = malloc(sizeof(char *) * 2);
147
129
if(new_plugin->argv == NULL){
148
int e = errno;
149
130
free(copy_name);
150
131
free(new_plugin);
151
errno = e;
152
132
return NULL;
153
133
}
154
134
new_plugin->argv[0] = copy_name;
155
135
new_plugin->argv[1] = NULL;
156
136
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
137
new_plugin->environ = malloc(sizeof(char *));
160
138
if(new_plugin->environ == NULL){
161
int e = errno;
162
139
free(copy_name);
163
140
free(new_plugin->argv);
164
141
free(new_plugin);
165
errno = e;
166
142
return NULL;
167
143
}
168
144
new_plugin->environ[0] = NULL;
173
149
}
174
150
175
151
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
152
static bool add_to_char_array(const char *new, char ***array,
178
153
int *len){
179
154
/* Resize the pointed-to array to hold one more pointer */
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);
155
*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
196
157
/* Malloc check */
197
if(new_array == NULL){
158
if(*array == NULL){
198
159
return false;
199
160
}
200
*array = new_array;
201
161
/* Make a copy of the new string */
202
char *copy;
203
do {
204
copy = strdup(new);
205
} while(copy == NULL and errno == EINTR);
162
char *copy = strdup(new);
206
163
if(copy == NULL){
207
164
return false;
208
165
}
215
172
}
216
173
217
174
/* Add to a plugin's argument vector */
218
__attribute__((nonnull(2), warn_unused_result))
219
175
static bool add_argument(plugin *p, const char *arg){
220
176
if(p == NULL){
221
177
return false;
224
180
}
225
181
226
182
/* Add to a plugin's environment */
227
__attribute__((nonnull(2), warn_unused_result))
228
183
static bool add_environment(plugin *p, const char *def, bool replace){
229
184
if(p == NULL){
230
185
return false;
232
187
/* namelen = length of name of environment variable */
233
188
size_t namelen = (size_t)(strchrnul(def, '=') - def);
234
189
/* Search for this environment variable */
235
for(char **envdef = p->environ; *envdef != NULL; envdef++){
236
if(strncmp(*envdef, def, namelen + 1) == 0){
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
237
192
/* It already exists */
238
193
if(replace){
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){
194
char *new = realloc(*e, strlen(def) + 1);
195
if(new == NULL){
244
196
return false;
245
197
}
246
*envdef = new_envdef;
247
strcpy(*envdef, def);
198
*e = new;
199
strcpy(*e, def);
248
200
}
249
201
return true;
250
202
}
252
204
return add_to_char_array(def, &(p->environ), &(p->envc));
253
205
}
254
206
255
#ifndef O_CLOEXEC
256
207
/*
257
208
* Based on the example in the GNU LibC manual chapter 13.13 "File
258
209
* Descriptor Flags".
259
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
260
211
*/
261
__attribute__((warn_unused_result))
262
212
static int set_cloexec_flag(int fd){
263
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
213
int ret = fcntl(fd, F_GETFD, 0);
264
214
/* If reading the flags failed, return error indication now. */
265
215
if(ret < 0){
266
216
return ret;
267
217
}
268
218
/* Store modified flag word in the descriptor. */
269
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
270
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
271
220
}
272
#endif /* not O_CLOEXEC */
273
221
274
222
275
223
/* Mark processes as completed when they exit, and save their exit
289
237
/* No child processes */
290
238
break;
291
239
}
292
error(0, errno, "waitpid");
240
perror("waitpid");
293
241
}
294
242
295
243
/* A child exited, find it in process_list */
307
255
}
308
256
309
257
/* Prints out a password to stdout */
310
__attribute__((nonnull, warn_unused_result))
311
258
static bool print_out_password(const char *buffer, size_t length){
312
259
ssize_t ret;
313
260
for(size_t written = 0; written < length; written += (size_t)ret){
321
268
}
322
269
323
270
/* Removes and free a plugin from the plugin list */
324
__attribute__((nonnull))
325
271
static void free_plugin(plugin *plugin_node){
326
272
327
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
273
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
328
274
free(*arg);
329
275
}
330
free(plugin_node->name);
331
276
free(plugin_node->argv);
332
277
for(char **env = plugin_node->environ; *env != NULL; env++){
333
278
free(*env);
334
279
}
335
280
free(plugin_node->environ);
336
281
free(plugin_node->buffer);
337
282
338
283
/* Removes the plugin from the singly-linked list */
339
284
if(plugin_node == plugin_list){
340
285
/* First one - simple */
360
305
361
306
int main(int argc, char *argv[]){
362
307
char *plugindir = NULL;
363
char *pluginhelperdir = NULL;
364
308
char *argfile = NULL;
365
309
FILE *conffp;
366
struct dirent **direntries = NULL;
310
size_t d_name_len;
311
DIR *dir = NULL;
312
struct dirent *dirst;
367
313
struct stat st;
368
314
fd_set rfds_all;
369
int ret, maxfd = 0;
315
int ret, numchars, maxfd = 0;
370
316
ssize_t sret;
317
intmax_t tmpmax;
371
318
uid_t uid = 65534;
372
319
gid_t gid = 65534;
373
320
bool debug = false;
377
324
.sa_flags = SA_NOCLDSTOP };
378
325
char **custom_argv = NULL;
379
326
int custom_argc = 0;
380
int dir_fd = -1;
381
327
382
328
/* Establish a signal handler */
383
329
sigemptyset(&sigchld_action.sa_mask);
384
330
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
385
331
if(ret == -1){
386
error(0, errno, "sigaddset");
387
exitstatus = EX_OSERR;
332
perror("sigaddset");
333
exitstatus = EXIT_FAILURE;
388
334
goto fallback;
389
335
}
390
336
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
391
337
if(ret == -1){
392
error(0, errno, "sigaction");
393
exitstatus = EX_OSERR;
338
perror("sigaction");
339
exitstatus = EXIT_FAILURE;
394
340
goto fallback;
395
341
}
396
342
428
374
.doc = "Group ID the plugins will run as", .group = 3 },
429
375
{ .name = "debug", .key = 132,
430
376
.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 },
444
377
{ .name = NULL }
445
378
};
446
379
447
__attribute__((nonnull(3)))
448
error_t parse_opt(int key, char *arg, struct argp_state *state){
449
errno = 0;
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
450
382
switch(key){
451
char *tmp;
452
intmax_t tmp_id;
453
383
case 'g': /* --global-options */
454
{
455
char *plugin_option;
456
while((plugin_option = strsep(&arg, ",")) != NULL){
457
if(not add_argument(getplugin(NULL), plugin_option)){
458
break;
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;
459
393
}
460
394
}
461
errno = 0;
462
395
}
463
396
break;
464
397
case 'G': /* --global-env */
465
if(add_environment(getplugin(NULL), arg, true)){
466
errno = 0;
398
if(arg == NULL){
399
break;
400
}
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
467
403
}
468
404
break;
469
405
case 'o': /* --options-for */
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;
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
}
491
425
}
492
426
break;
493
427
case 'E': /* --env-for */
428
if(arg == NULL){
429
break;
430
}
494
431
{
495
432
char *envdef = strchr(arg, ':');
496
433
if(envdef == NULL){
497
argp_error(state, "No colon in \"%s\"", arg);
498
errno = EINVAL;
499
434
break;
500
435
}
501
436
*envdef = '\0';
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;
437
if(not add_environment(getplugin(arg), envdef+1, true)){
438
perror("add_environment");
510
439
}
511
440
}
512
441
break;
513
442
case 'd': /* --disable */
514
{
443
if(arg != NULL){
515
444
plugin *p = getplugin(arg);
516
if(p != NULL){
517
p->disabled = true;
518
errno = 0;
445
if(p == NULL){
446
return ARGP_ERR_UNKNOWN;
519
447
}
448
p->disabled = true;
520
449
}
521
450
break;
522
451
case 'e': /* --enable */
523
{
452
if(arg != NULL){
524
453
plugin *p = getplugin(arg);
525
if(p != NULL){
526
p->disabled = false;
527
errno = 0;
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
528
456
}
457
p->disabled = false;
529
458
}
530
459
break;
531
460
case 128: /* --plugin-dir */
532
461
free(plugindir);
533
462
plugindir = strdup(arg);
534
if(plugindir != NULL){
535
errno = 0;
536
}
463
if(plugindir == NULL){
464
perror("strdup");
465
}
537
466
break;
538
467
case 129: /* --config-file */
539
468
/* This is already done by parse_opt_config_file() */
540
469
break;
541
470
case 130: /* --userid */
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;
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;
548
478
}
549
uid = (uid_t)tmp_id;
550
errno = 0;
551
479
break;
552
480
case 131: /* --groupid */
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;
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;
559
488
}
560
gid = (gid_t)tmp_id;
561
errno = 0;
562
489
break;
563
490
case 132: /* --debug */
564
491
debug = true;
565
492
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;
589
493
/*
590
494
* When adding more options before this line, remember to also add a
591
495
* "case" to the "parse_opt_config_file" function below.
594
498
/* Cryptsetup always passes an argument, which is an empty
595
499
string if "none" was specified in /etc/crypttab. So if
596
500
argument was empty, we ignore it silently. */
597
if(arg[0] == '\0'){
598
break;
501
if(arg[0] != '\0'){
502
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
599
503
}
600
#if __GNUC__ >= 7
601
__attribute__((fallthrough));
602
#else
603
/* FALLTHROUGH */
604
#endif
504
break;
505
case ARGP_KEY_END:
506
break;
605
507
default:
606
508
return ARGP_ERR_UNKNOWN;
607
509
}
608
return errno; /* Set to 0 at start */
510
return 0;
609
511
}
610
512
611
513
/* This option parser is the same as parse_opt() above, except it
613
515
error_t parse_opt_config_file(int key, char *arg,
614
516
__attribute__((unused))
615
517
struct argp_state *state){
616
errno = 0;
617
518
switch(key){
618
519
case 'g': /* --global-options */
619
520
case 'G': /* --global-env */
626
527
case 129: /* --config-file */
627
528
free(argfile);
628
529
argfile = strdup(arg);
629
if(argfile != NULL){
630
errno = 0;
530
if(argfile == NULL){
531
perror("strdup");
631
532
}
632
break;
533
break;
633
534
case 130: /* --userid */
634
535
case 131: /* --groupid */
635
536
case 132: /* --debug */
636
case 133: /* --plugin-helper-dir */
637
case '?': /* --help */
638
case -3: /* --usage */
639
case 'V': /* --version */
640
537
case ARGP_KEY_ARG:
538
case ARGP_KEY_END:
641
539
break;
642
540
default:
643
541
return ARGP_ERR_UNKNOWN;
644
542
}
645
return errno;
543
return 0;
646
544
}
647
545
648
546
struct argp argp = { .options = options,
652
550
653
551
/* Parse using parse_opt_config_file() in order to get the custom
654
552
config file location, if any. */
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;
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;
669
557
goto fallback;
670
558
}
671
559
677
565
conffp = fopen(AFILE, "r");
678
566
} else {
679
567
conffp = fopen(argfile, "r");
680
}
568
}
681
569
if(conffp != NULL){
682
570
char *org_line = NULL;
683
571
char *p, *arg, *new_arg, *line;
684
572
size_t size = 0;
685
573
const char whitespace_delims[] = " \r\t\f\v\n";
686
574
const char comment_delim[] = "#";
687
575
688
576
custom_argc = 1;
689
577
custom_argv = malloc(sizeof(char*) * 2);
690
578
if(custom_argv == NULL){
691
error(0, errno, "malloc");
692
exitstatus = EX_OSERR;
579
perror("malloc");
580
exitstatus = EXIT_FAILURE;
693
581
goto fallback;
694
582
}
695
583
custom_argv[0] = argv[0];
696
584
custom_argv[1] = NULL;
697
585
698
586
/* for each line in the config file, strip whitespace and ignore
699
587
commented text */
700
588
while(true){
702
590
if(sret == -1){
703
591
break;
704
592
}
705
593
706
594
line = org_line;
707
595
arg = strsep(&line, comment_delim);
708
596
while((p = strsep(&arg, whitespace_delims)) != NULL){
711
599
}
712
600
new_arg = strdup(p);
713
601
if(new_arg == NULL){
714
error(0, errno, "strdup");
715
exitstatus = EX_OSERR;
602
perror("strdup");
603
exitstatus = EXIT_FAILURE;
716
604
free(org_line);
717
605
goto fallback;
718
606
}
719
607
720
608
custom_argc += 1;
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
}
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;
744
616
}
745
617
custom_argv[custom_argc-1] = new_arg;
746
custom_argv[custom_argc] = NULL;
618
custom_argv[custom_argc] = NULL;
747
619
}
748
620
}
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
}
757
621
free(org_line);
758
622
} else {
759
623
/* Check for harmful errors and go to fallback. Other errors might
760
624
not affect opening plugins */
761
625
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
762
error(0, errno, "fopen");
763
exitstatus = EX_OSERR;
626
perror("fopen");
627
exitstatus = EXIT_FAILURE;
764
628
goto fallback;
765
629
}
766
630
}
767
/* If there were any arguments from the configuration file, pass
768
them to parser as command line arguments */
631
/* If there was any arguments from configuration file,
632
pass them to parser as command arguments */
769
633
if(custom_argv != NULL){
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;
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;
784
639
goto fallback;
785
640
}
786
641
}
787
642
788
643
/* Parse actual command line arguments, to let them override the
789
644
config file */
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
}
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;
823
650
}
824
651
825
652
if(debug){
826
for(plugin *p = plugin_list; p != NULL; p = p->next){
653
for(plugin *p = plugin_list; p != NULL; p=p->next){
827
654
fprintf(stderr, "Plugin: %s has %d arguments\n",
828
655
p->name ? p->name : "Global", p->argc - 1);
829
656
for(char **a = p->argv; *a != NULL; a++){
836
663
}
837
664
}
838
665
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);
666
/* Strip permissions down to nobody */
667
setgid(gid);
865
668
if(ret == -1){
866
error(0, errno, "setgid");
669
perror("setgid");
867
670
}
868
671
ret = setuid(uid);
869
672
if(ret == -1){
870
error(0, errno, "setuid");
871
}
872
873
/* Open plugin directory with close_on_exec flag */
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 */
874
689
{
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;
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;
919
697
}
920
698
}
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;
931
699
}
932
700
933
701
FD_ZERO(&rfds_all);
934
702
935
703
/* Read and execute any executable in the plugin directory*/
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]);
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");
942
771
continue;
943
772
}
944
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
773
774
ret = stat(filename, &st);
945
775
if(ret == -1){
946
error(0, errno, "stat");
947
close(plugin_fd);
948
free(direntries[i]);
776
perror("stat");
777
free(filename);
949
778
continue;
950
779
}
951
780
952
781
/* Ignore non-executable files */
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)){
782
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
956
783
if(debug){
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);
784
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
785
" with bad type or mode\n", filename);
961
786
}
962
close(plugin_fd);
963
free(direntries[i]);
787
free(filename);
964
788
continue;
965
789
}
966
790
967
plugin *p = getplugin(direntries[i]->d_name);
791
plugin *p = getplugin(dirst->d_name);
968
792
if(p == NULL){
969
error(0, errno, "getplugin");
970
close(plugin_fd);
971
free(direntries[i]);
793
perror("getplugin");
794
free(filename);
972
795
continue;
973
796
}
974
797
if(p->disabled){
975
798
if(debug){
976
799
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
977
direntries[i]->d_name);
800
dirst->d_name);
978
801
}
979
close(plugin_fd);
980
free(direntries[i]);
802
free(filename);
981
803
continue;
982
804
}
983
805
{
986
808
if(g != NULL){
987
809
for(char **a = g->argv + 1; *a != NULL; a++){
988
810
if(not add_argument(p, *a)){
989
error(0, errno, "add_argument");
811
perror("add_argument");
990
812
}
991
813
}
992
814
/* Add global environment variables */
993
815
for(char **e = g->environ; *e != NULL; e++){
994
816
if(not add_environment(p, *e, false)){
995
error(0, errno, "add_environment");
817
perror("add_environment");
996
818
}
997
819
}
998
820
}
999
821
}
1000
/* If this plugin has any environment variables, we need to
1001
duplicate the environment from this process, too. */
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. */
1002
825
if(p->environ[0] != NULL){
1003
826
for(char **e = environ; *e != NULL; e++){
1004
827
if(not add_environment(p, *e, false)){
1005
error(0, errno, "add_environment");
828
perror("add_environment");
1006
829
}
1007
830
}
1008
831
}
1009
832
1010
833
int pipefd[2];
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 */
834
ret = pipe(pipefd);
1016
835
if(ret == -1){
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
836
perror("pipe");
837
exitstatus = EXIT_FAILURE;
838
goto fallback;
839
}
1032
840
/* Ask OS to automatic close the pipe on exec */
1033
841
ret = set_cloexec_flag(pipefd[0]);
1034
842
if(ret < 0){
1035
error(0, errno, "set_cloexec_flag");
1036
close(pipefd[0]);
1037
close(pipefd[1]);
1038
exitstatus = EX_OSERR;
1039
free(direntries[i]);
843
perror("set_cloexec_flag");
844
exitstatus = EXIT_FAILURE;
1040
845
goto fallback;
1041
846
}
1042
847
ret = set_cloexec_flag(pipefd[1]);
1043
848
if(ret < 0){
1044
error(0, errno, "set_cloexec_flag");
1045
close(pipefd[0]);
1046
close(pipefd[1]);
1047
exitstatus = EX_OSERR;
1048
free(direntries[i]);
849
perror("set_cloexec_flag");
850
exitstatus = EXIT_FAILURE;
1049
851
goto fallback;
1050
852
}
1051
#endif /* not O_CLOEXEC */
1052
853
/* Block SIGCHLD until process is safely in process list */
1053
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1054
&sigchld_action.sa_mask,
1055
NULL));
854
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1056
855
if(ret < 0){
1057
error(0, errno, "sigprocmask");
1058
exitstatus = EX_OSERR;
1059
free(direntries[i]);
856
perror("sigprocmask");
857
exitstatus = EXIT_FAILURE;
1060
858
goto fallback;
1061
859
}
1062
860
/* Starting a new process to be watched */
1063
pid_t pid;
1064
do {
1065
pid = fork();
1066
} while(pid == -1 and errno == EINTR);
861
pid_t pid = fork();
1067
862
if(pid == -1){
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]);
863
perror("fork");
864
exitstatus = EXIT_FAILURE;
1075
865
goto fallback;
1076
866
}
1077
867
if(pid == 0){
1078
868
/* this is the child process */
1079
869
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1080
870
if(ret < 0){
1081
error(0, errno, "sigaction");
1082
_exit(EX_OSERR);
871
perror("sigaction");
872
_exit(EXIT_FAILURE);
1083
873
}
1084
874
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1085
875
if(ret < 0){
1086
error(0, errno, "sigprocmask");
1087
_exit(EX_OSERR);
876
perror("sigprocmask");
877
_exit(EXIT_FAILURE);
1088
878
}
1089
879
1090
880
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1091
881
if(ret == -1){
1092
error(0, errno, "dup2");
1093
_exit(EX_OSERR);
882
perror("dup2");
883
_exit(EXIT_FAILURE);
1094
884
}
1095
885
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);
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
}
1102
901
}
1103
902
/* no return */
1104
903
}
1105
904
/* Parent process */
1106
905
close(pipefd[1]); /* Close unused write end of pipe */
1107
close(plugin_fd);
1108
plugin *new_plugin = getplugin(direntries[i]->d_name);
906
free(filename);
907
plugin *new_plugin = getplugin(dirst->d_name);
1109
908
if(new_plugin == NULL){
1110
error(0, errno, "getplugin");
1111
ret = (int)(TEMP_FAILURE_RETRY
1112
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1113
NULL)));
909
perror("getplugin");
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1114
911
if(ret < 0){
1115
error(0, errno, "sigprocmask");
912
perror("sigprocmask");
1116
913
}
1117
exitstatus = EX_OSERR;
1118
free(direntries[i]);
914
exitstatus = EXIT_FAILURE;
1119
915
goto fallback;
1120
916
}
1121
free(direntries[i]);
1122
917
1123
918
new_plugin->pid = pid;
1124
919
new_plugin->fd = pipefd[0];
1125
1126
if(debug){
1127
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1128
new_plugin->name, (intmax_t) (new_plugin->pid));
1129
}
1130
920
1131
921
/* Unblock SIGCHLD so signal handler can be run if this process
1132
922
has already completed */
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1134
&sigchld_action.sa_mask,
1135
NULL));
923
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1136
924
if(ret < 0){
1137
error(0, errno, "sigprocmask");
1138
exitstatus = EX_OSERR;
925
perror("sigprocmask");
926
exitstatus = EXIT_FAILURE;
1139
927
goto fallback;
1140
928
}
1141
929
1146
934
}
1147
935
}
1148
936
1149
free(direntries);
1150
direntries = NULL;
1151
close(dir_fd);
1152
dir_fd = -1;
937
closedir(dir);
938
dir = NULL;
1153
939
free_plugin(getplugin(NULL));
1154
940
1155
941
for(plugin *p = plugin_list; p != NULL; p = p->next){
1167
953
while(plugin_list){
1168
954
fd_set rfds = rfds_all;
1169
955
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1170
if(select_ret == -1 and errno != EINTR){
1171
error(0, errno, "select");
1172
exitstatus = EX_OSERR;
956
if(select_ret == -1){
957
perror("select");
958
exitstatus = EXIT_FAILURE;
1173
959
goto fallback;
1174
960
}
1175
961
/* OK, now either a process completed, or something can be read
1181
967
if(not WIFEXITED(proc->status)
1182
968
or WEXITSTATUS(proc->status) != 0){
1183
969
/* Bad exit by plugin */
1184
970
1185
971
if(debug){
1186
972
if(WIFEXITED(proc->status)){
1187
973
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1190
976
WEXITSTATUS(proc->status));
1191
977
} else if(WIFSIGNALED(proc->status)){
1192
978
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1193
" signal %d: %s\n", proc->name,
979
" signal %d\n", proc->name,
1194
980
(intmax_t) (proc->pid),
1195
WTERMSIG(proc->status),
1196
strsignal(WTERMSIG(proc->status)));
981
WTERMSIG(proc->status));
982
} else if(WCOREDUMP(proc->status)){
983
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
984
" core\n", proc->name, (intmax_t) (proc->pid));
1197
985
}
1198
986
}
1199
987
1200
988
/* Remove the plugin */
1201
989
FD_CLR(proc->fd, &rfds_all);
1202
990
1203
991
/* Block signal while modifying process_list */
1204
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1205
(SIG_BLOCK,
1206
&sigchld_action.sa_mask,
1207
NULL));
992
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1208
993
if(ret < 0){
1209
error(0, errno, "sigprocmask");
1210
exitstatus = EX_OSERR;
994
perror("sigprocmask");
995
exitstatus = EXIT_FAILURE;
1211
996
goto fallback;
1212
997
}
1213
998
1216
1001
proc = next_plugin;
1217
1002
1218
1003
/* We are done modifying process list, so unblock signal */
1219
ret = (int)(TEMP_FAILURE_RETRY
1220
(sigprocmask(SIG_UNBLOCK,
1221
&sigchld_action.sa_mask, NULL)));
1004
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1005
NULL);
1222
1006
if(ret < 0){
1223
error(0, errno, "sigprocmask");
1224
exitstatus = EX_OSERR;
1007
perror("sigprocmask");
1008
exitstatus = EXIT_FAILURE;
1225
1009
goto fallback;
1226
1010
}
1227
1011
1237
1021
bool bret = print_out_password(proc->buffer,
1238
1022
proc->buffer_length);
1239
1023
if(not bret){
1240
error(0, errno, "print_out_password");
1241
exitstatus = EX_IOERR;
1024
perror("print_out_password");
1025
exitstatus = EXIT_FAILURE;
1242
1026
}
1243
1027
goto fallback;
1244
1028
}
1251
1035
}
1252
1036
/* Before reading, make the process' data buffer large enough */
1253
1037
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
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;
1038
proc->buffer = realloc(proc->buffer, proc->buffer_size
1039
+ (size_t) BUFFER_SIZE);
1040
if(proc->buffer == NULL){
1041
perror("malloc");
1042
exitstatus = EXIT_FAILURE;
1259
1043
goto fallback;
1260
1044
}
1261
proc->buffer = new_buffer;
1262
1045
proc->buffer_size += BUFFER_SIZE;
1263
1046
}
1264
1047
/* Read from the process */
1265
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1266
proc->buffer
1267
+ proc->buffer_length,
1268
BUFFER_SIZE));
1048
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1049
BUFFER_SIZE);
1269
1050
if(sret < 0){
1270
1051
/* Read error from this process; ignore the error */
1271
1052
proc = proc->next;
1279
1060
}
1280
1061
}
1281
1062
}
1282
1283
1063
1064
1284
1065
fallback:
1285
1066
1286
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1287
and exitstatus != EX_OK)){
1067
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1288
1068
/* Fallback if all plugins failed, none are found or an error
1289
1069
occured */
1290
1070
bool bret;
1298
1078
}
1299
1079
bret = print_out_password(passwordbuffer, len);
1300
1080
if(not bret){
1301
error(0, errno, "print_out_password");
1302
exitstatus = EX_IOERR;
1081
perror("print_out_password");
1082
exitstatus = EXIT_FAILURE;
1303
1083
}
1304
1084
}
1305
1085
1306
1086
/* Restore old signal handler */
1307
1087
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1308
1088
if(ret == -1){
1309
error(0, errno, "sigaction");
1310
exitstatus = EX_OSERR;
1089
perror("sigaction");
1090
exitstatus = EXIT_FAILURE;
1311
1091
}
1312
1092
1313
1093
if(custom_argv != NULL){
1317
1097
free(custom_argv);
1318
1098
}
1319
1099
1320
free(direntries);
1321
1322
if(dir_fd != -1){
1323
close(dir_fd);
1100
if(dir != NULL){
1101
closedir(dir);
1324
1102
}
1325
1103
1326
1104
/* Kill the processes */
1330
1108
ret = kill(p->pid, SIGTERM);
1331
1109
if(ret == -1 and errno != ESRCH){
1332
1110
/* Set-uid proccesses might not get closed */
1333
error(0, errno, "kill");
1111
perror("kill");
1334
1112
}
1335
1113
}
1336
1114
}
1337
1115
1338
1116
/* Wait for any remaining child processes to terminate */
1339
do {
1117
do{
1340
1118
ret = wait(NULL);
1341
1119
} while(ret >= 0);
1342
1120
if(errno != ECHILD){
1343
error(0, errno, "wait");
1121
perror("wait");
1344
1122
}
1345
1123
1346
1124
free_plugin_list();
1347
1125
1348
1126
free(plugindir);
1349
free(pluginhelperdir);
1350
1127
free(argfile);
1351
1128
1352
1129
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0