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- Committer: Teddy Hogeborn
- Date: 2017-08-20 19:12:58 UTC
- mto: This revision was merged to the branch mainline in revision 911.
- Revision ID: teddy@recompile.se-20170820191258-9s80xonyan5vavbo
Tags: version-1.7.16-1
* Makefile (version): Change to 1.7.16.
* NEWS (Version 1.7.16): Add new entry.
* debian/changelog (1.7.16-1): - '' -
* NEWS (Version 1.7.16): Add new entry.
* debian/changelog (1.7.16-1): - '' -
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files removed:
- etc-plugins.d-README
- 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 © 2007-2008 Teddy Hogeborn & Björn Påhlsson
6
*
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
9
* published by the Free Software Foundation, either version 3 of the
10
* License, or (at your option) any later version.
11
*
12
* This program is distributed in the hope that it will be useful, but
5
* Copyright © 2008-2017 Teddy Hogeborn
6
* Copyright © 2008-2017 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
13
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
14
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15
18
* General Public License for more details.
16
19
*
17
20
* You should have received a copy of the GNU General Public License
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
20
22
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
22
24
*/
23
25
24
26
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
27
O_CLOEXEC, pipe2() */
26
28
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
30
realloc() */
29
31
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
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() */
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
43
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
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
*/
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
55
57
#include <errno.h> /* errno */
56
58
#include <argp.h> /* struct argp_option, struct
57
59
argp_state, struct argp,
61
63
#include <signal.h> /* struct sigaction, sigemptyset(),
62
64
sigaddset(), sigaction(),
63
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
65
68
#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() */
66
75
67
76
#define BUFFER_SIZE 256
68
77
69
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
70
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
81
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct plugin;
82
const char *argp_program_version = "plugin-runner " VERSION;
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;
89
97
size_t buffer_size;
90
98
size_t buffer_length;
91
99
bool eof;
92
volatile bool completed;
93
volatile int status;
100
volatile sig_atomic_t completed;
101
int status;
94
102
struct plugin *next;
95
103
} plugin;
96
104
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 */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
104
if ((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
111
/* Check for existing plugin with that name */
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
if((p->name == name)
114
or (p->name and name and (strcmp(p->name, name) == 0))){
106
115
return p;
107
116
}
108
117
}
109
118
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
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;
133
free(new_plugin);
134
errno = e;
118
135
return NULL;
119
136
}
120
137
}
121
138
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
126
143
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
144
do {
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
147
if(new_plugin->argv == NULL){
148
int e = errno;
129
149
free(copy_name);
130
150
free(new_plugin);
151
errno = e;
131
152
return NULL;
132
153
}
133
154
new_plugin->argv[0] = copy_name;
134
155
new_plugin->argv[1] = NULL;
135
156
136
new_plugin->environ = malloc(sizeof(char *));
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
137
160
if(new_plugin->environ == NULL){
161
int e = errno;
138
162
free(copy_name);
139
163
free(new_plugin->argv);
140
164
free(new_plugin);
165
errno = e;
141
166
return NULL;
142
167
}
143
168
new_plugin->environ[0] = NULL;
148
173
}
149
174
150
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
151
177
static bool add_to_char_array(const char *new, char ***array,
152
178
int *len){
153
179
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (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);
156
185
/* Malloc check */
157
if(*array == NULL){
186
if(new_array == NULL){
158
187
return false;
159
188
}
189
*array = new_array;
160
190
/* Make a copy of the new string */
161
char *copy = strdup(new);
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
162
195
if(copy == NULL){
163
196
return false;
164
197
}
171
204
}
172
205
173
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
174
208
static bool add_argument(plugin *p, const char *arg){
175
209
if(p == NULL){
176
210
return false;
179
213
}
180
214
181
215
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
182
217
static bool add_environment(plugin *p, const char *def, bool replace){
183
218
if(p == NULL){
184
219
return false;
186
221
/* namelen = length of name of environment variable */
187
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
223
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
191
226
/* It already exists */
192
227
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
194
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){
195
233
return false;
196
234
}
197
*e = new;
198
strcpy(*e, def);
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
199
237
}
200
238
return true;
201
239
}
203
241
return add_to_char_array(def, &(p->environ), &(p->envc));
204
242
}
205
243
244
#ifndef O_CLOEXEC
206
245
/*
207
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
247
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
249
*/
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
250
__attribute__((warn_unused_result))
251
static int set_cloexec_flag(int fd){
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
253
/* If reading the flags failed, return error indication now. */
215
254
if(ret < 0){
216
255
return ret;
217
256
}
218
257
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
220
260
}
261
#endif /* not O_CLOEXEC */
221
262
222
263
223
264
/* Mark processes as completed when they exit, and save their exit
224
265
status. */
225
void handle_sigchld(__attribute__((unused)) int sig){
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
226
268
while(true){
227
269
plugin *proc = plugin_list;
228
270
int status;
232
274
break;
233
275
}
234
276
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
237
280
}
238
/* No child processes */
239
break;
281
error(0, errno, "waitpid");
240
282
}
241
283
242
284
/* A child exited, find it in process_list */
248
290
continue;
249
291
}
250
292
proc->status = status;
251
proc->completed = true;
293
proc->completed = 1;
252
294
}
295
errno = old_errno;
253
296
}
254
297
255
298
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
299
__attribute__((nonnull, warn_unused_result))
300
static bool print_out_password(const char *buffer, size_t length){
257
301
ssize_t ret;
258
302
for(size_t written = 0; written < length; written += (size_t)ret){
259
303
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
266
310
}
267
311
268
312
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
269
314
static void free_plugin(plugin *plugin_node){
270
315
271
316
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
277
322
}
278
323
free(plugin_node->environ);
279
324
free(plugin_node->buffer);
280
325
281
326
/* Removes the plugin from the singly-linked list */
282
327
if(plugin_node == plugin_list){
283
328
/* First one - simple */
303
348
304
349
int main(int argc, char *argv[]){
305
350
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
306
352
char *argfile = NULL;
307
353
FILE *conffp;
308
size_t d_name_len;
309
DIR *dir = NULL;
310
struct dirent *dirst;
354
struct dirent **direntries = NULL;
311
355
struct stat st;
312
356
fd_set rfds_all;
313
357
int ret, maxfd = 0;
358
ssize_t sret;
314
359
uid_t uid = 65534;
315
360
gid_t gid = 65534;
316
361
bool debug = false;
320
365
.sa_flags = SA_NOCLDSTOP };
321
366
char **custom_argv = NULL;
322
367
int custom_argc = 0;
368
int dir_fd = -1;
323
369
324
370
/* Establish a signal handler */
325
371
sigemptyset(&sigchld_action.sa_mask);
326
372
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
327
373
if(ret == -1){
328
perror("sigaddset");
329
exitstatus = EXIT_FAILURE;
374
error(0, errno, "sigaddset");
375
exitstatus = EX_OSERR;
330
376
goto fallback;
331
377
}
332
378
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
333
379
if(ret == -1){
334
perror("sigaction");
335
exitstatus = EXIT_FAILURE;
380
error(0, errno, "sigaction");
381
exitstatus = EX_OSERR;
336
382
goto fallback;
337
383
}
338
384
370
416
.doc = "Group ID the plugins will run as", .group = 3 },
371
417
{ .name = "debug", .key = 132,
372
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 },
373
432
{ .name = NULL }
374
433
};
375
434
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
switch (key) {
435
__attribute__((nonnull(3)))
436
error_t parse_opt(int key, char *arg, struct argp_state *state){
437
errno = 0;
438
switch(key){
439
char *tmp;
440
intmax_t tmp_id;
379
441
case 'g': /* --global-options */
380
if (arg != NULL){
381
char *p;
382
while((p = strsep(&arg, ",")) != NULL){
383
if(p[0] == '\0'){
384
continue;
385
}
386
if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
return ARGP_ERR_UNKNOWN;
442
{
443
char *plugin_option;
444
while((plugin_option = strsep(&arg, ",")) != NULL){
445
if(not add_argument(getplugin(NULL), plugin_option)){
446
break;
389
447
}
390
448
}
449
errno = 0;
391
450
}
392
451
break;
393
452
case 'G': /* --global-env */
394
if(arg == NULL){
395
break;
396
}
397
{
398
char *envdef = strdup(arg);
399
if(envdef == NULL){
400
break;
401
}
402
if(not add_environment(getplugin(NULL), envdef, true)){
403
perror("add_environment");
404
}
453
if(add_environment(getplugin(NULL), arg, true)){
454
errno = 0;
405
455
}
406
456
break;
407
457
case 'o': /* --options-for */
408
if (arg != NULL){
409
char *p_name = strsep(&arg, ":");
410
if(p_name[0] == '\0' or arg == NULL){
411
break;
412
}
413
char *opt = strsep(&arg, ":");
414
if(opt[0] == '\0' or opt == NULL){
415
break;
416
}
417
char *p;
418
while((p = strsep(&opt, ",")) != NULL){
419
if(p[0] == '\0'){
420
continue;
421
}
422
if(not add_argument(getplugin(p_name), p)){
423
perror("add_argument");
424
return ARGP_ERR_UNKNOWN;
425
}
426
}
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;
476
}
477
}
478
errno = 0;
427
479
}
428
480
break;
429
481
case 'E': /* --env-for */
430
if(arg == NULL){
431
break;
432
}
433
482
{
434
483
char *envdef = strchr(arg, ':');
435
484
if(envdef == NULL){
436
break;
437
}
438
char *p_name = strndup(arg, (size_t) (envdef-arg));
439
if(p_name == NULL){
440
break;
441
}
485
argp_error(state, "No colon in \"%s\"", arg);
486
errno = EINVAL;
487
break;
488
}
489
*envdef = '\0';
442
490
envdef++;
443
if(not add_environment(getplugin(p_name), envdef, true)){
444
perror("add_environment");
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;
445
498
}
446
499
}
447
500
break;
448
501
case 'd': /* --disable */
449
if (arg != NULL){
502
{
450
503
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
504
if(p != NULL){
505
p->disabled = true;
506
errno = 0;
453
507
}
454
p->disabled = true;
455
508
}
456
509
break;
457
510
case 'e': /* --enable */
458
if (arg != NULL){
511
{
459
512
plugin *p = getplugin(arg);
460
if(p == NULL){
461
return ARGP_ERR_UNKNOWN;
513
if(p != NULL){
514
p->disabled = false;
515
errno = 0;
462
516
}
463
p->disabled = false;
464
517
}
465
518
break;
466
519
case 128: /* --plugin-dir */
520
free(plugindir);
467
521
plugindir = strdup(arg);
468
if(plugindir == NULL){
469
perror("strdup");
470
}
522
if(plugindir != NULL){
523
errno = 0;
524
}
471
525
break;
472
526
case 129: /* --config-file */
473
527
/* This is already done by parse_opt_config_file() */
474
528
break;
475
529
case 130: /* --userid */
476
uid = (uid_t)strtol(arg, NULL, 10);
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;
536
}
537
uid = (uid_t)tmp_id;
538
errno = 0;
477
539
break;
478
540
case 131: /* --groupid */
479
gid = (gid_t)strtol(arg, NULL, 10);
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;
547
}
548
gid = (gid_t)tmp_id;
549
errno = 0;
480
550
break;
481
551
case 132: /* --debug */
482
552
debug = true;
483
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
case -3: /* --usage */
568
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
569
argp_state_help(state, state->out_stream,
570
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
571
case 'V': /* --version */
572
fprintf(state->out_stream, "%s\n", argp_program_version);
573
exit(EXIT_SUCCESS);
574
break;
575
/*
576
* When adding more options before this line, remember to also add a
577
* "case" to the "parse_opt_config_file" function below.
578
*/
484
579
case ARGP_KEY_ARG:
485
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
486
break;
487
case ARGP_KEY_END:
488
break;
580
/* Cryptsetup always passes an argument, which is an empty
581
string if "none" was specified in /etc/crypttab. So if
582
argument was empty, we ignore it silently. */
583
if(arg[0] == '\0'){
584
break;
585
}
489
586
default:
490
587
return ARGP_ERR_UNKNOWN;
491
588
}
492
return 0;
589
return errno; /* Set to 0 at start */
493
590
}
494
591
495
592
/* This option parser is the same as parse_opt() above, except it
496
593
ignores everything but the --config-file option. */
497
error_t parse_opt_config_file (int key, char *arg,
498
__attribute__((unused))
499
struct argp_state *state) {
500
switch (key) {
594
error_t parse_opt_config_file(int key, char *arg,
595
__attribute__((unused))
596
struct argp_state *state){
597
errno = 0;
598
switch(key){
501
599
case 'g': /* --global-options */
502
600
case 'G': /* --global-env */
503
601
case 'o': /* --options-for */
507
605
case 128: /* --plugin-dir */
508
606
break;
509
607
case 129: /* --config-file */
608
free(argfile);
510
609
argfile = strdup(arg);
511
if(argfile == NULL){
512
perror("strdup");
610
if(argfile != NULL){
611
errno = 0;
513
612
}
514
break;
613
break;
515
614
case 130: /* --userid */
516
615
case 131: /* --groupid */
517
616
case 132: /* --debug */
617
case 133: /* --plugin-helper-dir */
618
case '?': /* --help */
619
case -3: /* --usage */
620
case 'V': /* --version */
518
621
case ARGP_KEY_ARG:
519
case ARGP_KEY_END:
520
622
break;
521
623
default:
522
624
return ARGP_ERR_UNKNOWN;
523
625
}
524
return 0;
626
return errno;
525
627
}
526
628
527
629
struct argp argp = { .options = options,
529
631
.args_doc = "",
530
632
.doc = "Mandos plugin runner -- Run plugins" };
531
633
532
/* Parse using the parse_opt_config_file in order to get the custom
634
/* Parse using parse_opt_config_file() in order to get the custom
533
635
config file location, if any. */
534
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
535
if (ret == ARGP_ERR_UNKNOWN){
536
fprintf(stderr, "Unknown error while parsing arguments\n");
537
exitstatus = EXIT_FAILURE;
636
ret = argp_parse(&argp, argc, argv,
637
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
638
NULL, NULL);
639
switch(ret){
640
case 0:
641
break;
642
case ENOMEM:
643
default:
644
errno = ret;
645
error(0, errno, "argp_parse");
646
exitstatus = EX_OSERR;
647
goto fallback;
648
case EINVAL:
649
exitstatus = EX_USAGE;
538
650
goto fallback;
539
651
}
540
652
542
654
argp.parser = parse_opt;
543
655
544
656
/* Open the configfile if available */
545
if (argfile == NULL){
657
if(argfile == NULL){
546
658
conffp = fopen(AFILE, "r");
547
659
} else {
548
660
conffp = fopen(argfile, "r");
549
}
661
}
550
662
if(conffp != NULL){
551
663
char *org_line = NULL;
552
664
char *p, *arg, *new_arg, *line;
553
665
size_t size = 0;
554
ssize_t sret;
555
666
const char whitespace_delims[] = " \r\t\f\v\n";
556
667
const char comment_delim[] = "#";
557
668
558
669
custom_argc = 1;
559
670
custom_argv = malloc(sizeof(char*) * 2);
560
671
if(custom_argv == NULL){
561
perror("malloc");
562
exitstatus = EXIT_FAILURE;
672
error(0, errno, "malloc");
673
exitstatus = EX_OSERR;
563
674
goto fallback;
564
675
}
565
676
custom_argv[0] = argv[0];
566
677
custom_argv[1] = NULL;
567
678
568
679
/* for each line in the config file, strip whitespace and ignore
569
680
commented text */
570
681
while(true){
572
683
if(sret == -1){
573
684
break;
574
685
}
575
686
576
687
line = org_line;
577
688
arg = strsep(&line, comment_delim);
578
689
while((p = strsep(&arg, whitespace_delims)) != NULL){
581
692
}
582
693
new_arg = strdup(p);
583
694
if(new_arg == NULL){
584
perror("strdup");
585
exitstatus = EXIT_FAILURE;
695
error(0, errno, "strdup");
696
exitstatus = EX_OSERR;
586
697
free(org_line);
587
698
goto fallback;
588
699
}
589
700
590
701
custom_argc += 1;
591
custom_argv = realloc(custom_argv, sizeof(char *)
592
* ((unsigned int) custom_argc + 1));
593
if(custom_argv == NULL){
594
perror("realloc");
595
exitstatus = EXIT_FAILURE;
596
free(org_line);
597
goto fallback;
702
{
703
char **new_argv = realloc(custom_argv, sizeof(char *)
704
* ((size_t)custom_argc + 1));
705
if(new_argv == NULL){
706
error(0, errno, "realloc");
707
exitstatus = EX_OSERR;
708
free(new_arg);
709
free(org_line);
710
goto fallback;
711
} else {
712
custom_argv = new_argv;
713
}
598
714
}
599
715
custom_argv[custom_argc-1] = new_arg;
600
custom_argv[custom_argc] = NULL;
716
custom_argv[custom_argc] = NULL;
601
717
}
602
718
}
719
do {
720
ret = fclose(conffp);
721
} while(ret == EOF and errno == EINTR);
722
if(ret == EOF){
723
error(0, errno, "fclose");
724
exitstatus = EX_IOERR;
725
goto fallback;
726
}
603
727
free(org_line);
604
728
} else {
605
729
/* Check for harmful errors and go to fallback. Other errors might
606
730
not affect opening plugins */
607
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
608
perror("fopen");
609
exitstatus = EXIT_FAILURE;
731
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
732
error(0, errno, "fopen");
733
exitstatus = EX_OSERR;
610
734
goto fallback;
611
735
}
612
736
}
613
/* If there was any arguments from configuration file,
614
pass them to parser as command arguments */
737
/* If there were any arguments from the configuration file, pass
738
them to parser as command line arguments */
615
739
if(custom_argv != NULL){
616
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
617
0, NULL);
618
if (ret == ARGP_ERR_UNKNOWN){
619
fprintf(stderr, "Unknown error while parsing arguments\n");
620
exitstatus = EXIT_FAILURE;
740
ret = argp_parse(&argp, custom_argc, custom_argv,
741
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
742
NULL, NULL);
743
switch(ret){
744
case 0:
745
break;
746
case ENOMEM:
747
default:
748
errno = ret;
749
error(0, errno, "argp_parse");
750
exitstatus = EX_OSERR;
751
goto fallback;
752
case EINVAL:
753
exitstatus = EX_CONFIG;
621
754
goto fallback;
622
755
}
623
756
}
624
757
625
758
/* Parse actual command line arguments, to let them override the
626
759
config file */
627
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
628
if (ret == ARGP_ERR_UNKNOWN){
629
fprintf(stderr, "Unknown error while parsing arguments\n");
630
exitstatus = EXIT_FAILURE;
631
goto fallback;
760
ret = argp_parse(&argp, argc, argv,
761
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
762
NULL, NULL);
763
switch(ret){
764
case 0:
765
break;
766
case ENOMEM:
767
default:
768
errno = ret;
769
error(0, errno, "argp_parse");
770
exitstatus = EX_OSERR;
771
goto fallback;
772
case EINVAL:
773
exitstatus = EX_USAGE;
774
goto fallback;
775
}
776
777
{
778
char *pluginhelperenv;
779
bool bret = true;
780
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
781
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
782
if(ret != -1){
783
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
784
}
785
if(ret == -1 or not bret){
786
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
787
" environment variable to \"%s\" for all plugins\n",
788
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
789
}
790
if(ret != -1){
791
free(pluginhelperenv);
792
}
632
793
}
633
794
634
795
if(debug){
635
for(plugin *p = plugin_list; p != NULL; p=p->next){
796
for(plugin *p = plugin_list; p != NULL; p = p->next){
636
797
fprintf(stderr, "Plugin: %s has %d arguments\n",
637
798
p->name ? p->name : "Global", p->argc - 1);
638
799
for(char **a = p->argv; *a != NULL; a++){
639
800
fprintf(stderr, "\tArg: %s\n", *a);
640
801
}
641
fprintf(stderr, "...and %u environment variables\n", p->envc);
802
fprintf(stderr, "...and %d environment variables\n", p->envc);
642
803
for(char **a = p->environ; *a != NULL; a++){
643
804
fprintf(stderr, "\t%s\n", *a);
644
805
}
645
806
}
646
807
}
647
808
648
/* Strip permissions down to nobody */
809
if(getuid() == 0){
810
/* Work around Debian bug #633582:
811
<https://bugs.debian.org/633582> */
812
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
813
if(plugindir_fd == -1){
814
if(errno != ENOENT){
815
error(0, errno, "open(\"" PDIR "\")");
816
}
817
} else {
818
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
819
if(ret == -1){
820
error(0, errno, "fstat");
821
} else {
822
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
823
ret = fchown(plugindir_fd, uid, gid);
824
if(ret == -1){
825
error(0, errno, "fchown");
826
}
827
}
828
}
829
close(plugindir_fd);
830
}
831
}
832
833
/* Lower permissions */
834
ret = setgid(gid);
835
if(ret == -1){
836
error(0, errno, "setgid");
837
}
649
838
ret = setuid(uid);
650
if (ret == -1){
651
perror("setuid");
652
}
653
setgid(gid);
654
if (ret == -1){
655
perror("setgid");
656
}
657
658
if (plugindir == NULL){
659
dir = opendir(PDIR);
660
} else {
661
dir = opendir(plugindir);
662
}
663
664
if(dir == NULL){
665
perror("Could not open plugin dir");
666
exitstatus = EXIT_FAILURE;
667
goto fallback;
668
}
669
670
/* Set the FD_CLOEXEC flag on the directory, if possible */
839
if(ret == -1){
840
error(0, errno, "setuid");
841
}
842
843
/* Open plugin directory with close_on_exec flag */
671
844
{
672
int dir_fd = dirfd(dir);
673
if(dir_fd >= 0){
674
ret = set_cloexec_flag(dir_fd);
675
if(ret < 0){
676
perror("set_cloexec_flag");
677
exitstatus = EXIT_FAILURE;
678
goto fallback;
845
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
846
#ifdef O_CLOEXEC
847
O_CLOEXEC
848
#else /* not O_CLOEXEC */
849
0
850
#endif /* not O_CLOEXEC */
851
);
852
if(dir_fd == -1){
853
error(0, errno, "Could not open plugin dir");
854
exitstatus = EX_UNAVAILABLE;
855
goto fallback;
856
}
857
858
#ifndef O_CLOEXEC
859
/* Set the FD_CLOEXEC flag on the directory */
860
ret = set_cloexec_flag(dir_fd);
861
if(ret < 0){
862
error(0, errno, "set_cloexec_flag");
863
exitstatus = EX_OSERR;
864
goto fallback;
865
}
866
#endif /* O_CLOEXEC */
867
}
868
869
int good_name(const struct dirent * const dirent){
870
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
871
"*.dpkg-old", "*.dpkg-bak",
872
"*.dpkg-divert", NULL };
873
#ifdef __GNUC__
874
#pragma GCC diagnostic push
875
#pragma GCC diagnostic ignored "-Wcast-qual"
876
#endif
877
for(const char **pat = (const char **)patterns;
878
*pat != NULL; pat++){
879
#ifdef __GNUC__
880
#pragma GCC diagnostic pop
881
#endif
882
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
883
!= FNM_NOMATCH){
884
if(debug){
885
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
886
" matching pattern %s\n", dirent->d_name, *pat);
887
}
888
return 0;
679
889
}
680
890
}
891
return 1;
892
}
893
894
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
895
alphasort);
896
if(numplugins == -1){
897
error(0, errno, "Could not scan plugin dir");
898
direntries = NULL;
899
exitstatus = EX_OSERR;
900
goto fallback;
681
901
}
682
902
683
903
FD_ZERO(&rfds_all);
684
904
685
905
/* Read and execute any executable in the plugin directory*/
686
while(true){
687
dirst = readdir(dir);
688
689
/* All directory entries have been processed */
690
if(dirst == NULL){
691
if (errno == EBADF){
692
perror("readdir");
693
exitstatus = EXIT_FAILURE;
694
goto fallback;
695
}
696
break;
697
}
698
699
d_name_len = strlen(dirst->d_name);
700
701
/* Ignore dotfiles, backup files and other junk */
702
{
703
bool bad_name = false;
704
705
const char const *bad_prefixes[] = { ".", "#", NULL };
706
707
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
708
".dpkg-old",
709
".dpkg-divert", NULL };
710
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
711
size_t pre_len = strlen(*pre);
712
if((d_name_len >= pre_len)
713
and strncmp((dirst->d_name), *pre, pre_len) == 0){
714
if(debug){
715
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
716
" with bad prefix %s\n", dirst->d_name, *pre);
717
}
718
bad_name = true;
719
break;
720
}
721
}
722
if(bad_name){
723
continue;
724
}
725
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
726
size_t suf_len = strlen(*suf);
727
if((d_name_len >= suf_len)
728
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
729
== 0)){
730
if(debug){
731
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
732
" with bad suffix %s\n", dirst->d_name, *suf);
733
}
734
bad_name = true;
735
break;
736
}
737
}
738
739
if(bad_name){
740
continue;
741
}
742
}
743
744
char *filename;
745
if(plugindir == NULL){
746
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
747
} else {
748
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
749
}
750
if(ret < 0){
751
perror("asprintf");
752
continue;
753
}
754
755
ret = stat(filename, &st);
756
if (ret == -1){
757
perror("stat");
758
free(filename);
759
continue;
760
}
761
906
for(int i = 0; i < numplugins; i++){
907
908
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
909
if(plugin_fd == -1){
910
error(0, errno, "Could not open plugin");
911
free(direntries[i]);
912
continue;
913
}
914
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
915
if(ret == -1){
916
error(0, errno, "stat");
917
close(plugin_fd);
918
free(direntries[i]);
919
continue;
920
}
921
762
922
/* Ignore non-executable files */
763
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
923
if(not S_ISREG(st.st_mode)
924
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
925
X_OK, 0)) != 0)){
764
926
if(debug){
765
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
766
" with bad type or mode\n", filename);
927
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
928
" with bad type or mode\n",
929
plugindir != NULL ? plugindir : PDIR,
930
direntries[i]->d_name);
767
931
}
768
free(filename);
932
close(plugin_fd);
933
free(direntries[i]);
769
934
continue;
770
935
}
771
936
772
plugin *p = getplugin(dirst->d_name);
937
plugin *p = getplugin(direntries[i]->d_name);
773
938
if(p == NULL){
774
perror("getplugin");
775
free(filename);
939
error(0, errno, "getplugin");
940
close(plugin_fd);
941
free(direntries[i]);
776
942
continue;
777
943
}
778
944
if(p->disabled){
779
945
if(debug){
780
946
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
781
dirst->d_name);
947
direntries[i]->d_name);
782
948
}
783
free(filename);
949
close(plugin_fd);
950
free(direntries[i]);
784
951
continue;
785
952
}
786
953
{
789
956
if(g != NULL){
790
957
for(char **a = g->argv + 1; *a != NULL; a++){
791
958
if(not add_argument(p, *a)){
792
perror("add_argument");
959
error(0, errno, "add_argument");
793
960
}
794
961
}
795
962
/* Add global environment variables */
796
963
for(char **e = g->environ; *e != NULL; e++){
797
964
if(not add_environment(p, *e, false)){
798
perror("add_environment");
965
error(0, errno, "add_environment");
799
966
}
800
967
}
801
968
}
802
969
}
803
/* If this plugin has any environment variables, we will call
804
using execve and need to duplicate the environment from this
805
process, too. */
970
/* If this plugin has any environment variables, we need to
971
duplicate the environment from this process, too. */
806
972
if(p->environ[0] != NULL){
807
973
for(char **e = environ; *e != NULL; e++){
808
974
if(not add_environment(p, *e, false)){
809
perror("add_environment");
975
error(0, errno, "add_environment");
810
976
}
811
977
}
812
978
}
813
979
814
980
int pipefd[2];
815
ret = pipe(pipefd);
816
if (ret == -1){
817
perror("pipe");
818
exitstatus = EXIT_FAILURE;
819
goto fallback;
820
}
981
#ifndef O_CLOEXEC
982
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
983
#else /* O_CLOEXEC */
984
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
985
#endif /* O_CLOEXEC */
986
if(ret == -1){
987
error(0, errno, "pipe");
988
exitstatus = EX_OSERR;
989
free(direntries[i]);
990
goto fallback;
991
}
992
if(pipefd[0] >= FD_SETSIZE){
993
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
994
FD_SETSIZE);
995
close(pipefd[0]);
996
close(pipefd[1]);
997
exitstatus = EX_OSERR;
998
free(direntries[i]);
999
goto fallback;
1000
}
1001
#ifndef O_CLOEXEC
821
1002
/* Ask OS to automatic close the pipe on exec */
822
1003
ret = set_cloexec_flag(pipefd[0]);
823
1004
if(ret < 0){
824
perror("set_cloexec_flag");
825
exitstatus = EXIT_FAILURE;
1005
error(0, errno, "set_cloexec_flag");
1006
close(pipefd[0]);
1007
close(pipefd[1]);
1008
exitstatus = EX_OSERR;
1009
free(direntries[i]);
826
1010
goto fallback;
827
1011
}
828
1012
ret = set_cloexec_flag(pipefd[1]);
829
1013
if(ret < 0){
830
perror("set_cloexec_flag");
831
exitstatus = EXIT_FAILURE;
1014
error(0, errno, "set_cloexec_flag");
1015
close(pipefd[0]);
1016
close(pipefd[1]);
1017
exitstatus = EX_OSERR;
1018
free(direntries[i]);
832
1019
goto fallback;
833
1020
}
1021
#endif /* not O_CLOEXEC */
834
1022
/* Block SIGCHLD until process is safely in process list */
835
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1023
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1024
&sigchld_action.sa_mask,
1025
NULL));
836
1026
if(ret < 0){
837
perror("sigprocmask");
838
exitstatus = EXIT_FAILURE;
1027
error(0, errno, "sigprocmask");
1028
exitstatus = EX_OSERR;
1029
free(direntries[i]);
839
1030
goto fallback;
840
1031
}
841
1032
/* Starting a new process to be watched */
842
pid_t pid = fork();
1033
pid_t pid;
1034
do {
1035
pid = fork();
1036
} while(pid == -1 and errno == EINTR);
843
1037
if(pid == -1){
844
perror("fork");
845
exitstatus = EXIT_FAILURE;
1038
error(0, errno, "fork");
1039
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1040
&sigchld_action.sa_mask, NULL));
1041
close(pipefd[0]);
1042
close(pipefd[1]);
1043
exitstatus = EX_OSERR;
1044
free(direntries[i]);
846
1045
goto fallback;
847
1046
}
848
1047
if(pid == 0){
849
1048
/* this is the child process */
850
1049
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
851
1050
if(ret < 0){
852
perror("sigaction");
853
_exit(EXIT_FAILURE);
1051
error(0, errno, "sigaction");
1052
_exit(EX_OSERR);
854
1053
}
855
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1054
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
856
1055
if(ret < 0){
857
perror("sigprocmask");
858
_exit(EXIT_FAILURE);
1056
error(0, errno, "sigprocmask");
1057
_exit(EX_OSERR);
859
1058
}
860
1059
861
1060
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
862
1061
if(ret == -1){
863
perror("dup2");
864
_exit(EXIT_FAILURE);
1062
error(0, errno, "dup2");
1063
_exit(EX_OSERR);
865
1064
}
866
1065
867
if(dirfd(dir) < 0){
868
/* If dir has no file descriptor, we could not set FD_CLOEXEC
869
above and must now close it manually here. */
870
closedir(dir);
871
}
872
if(p->environ[0] == NULL){
873
if(execv(filename, p->argv) < 0){
874
perror("execv");
875
_exit(EXIT_FAILURE);
876
}
877
} else {
878
if(execve(filename, p->argv, p->environ) < 0){
879
perror("execve");
880
_exit(EXIT_FAILURE);
881
}
1066
if(fexecve(plugin_fd, p->argv,
1067
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1068
error(0, errno, "fexecve for %s/%s",
1069
plugindir != NULL ? plugindir : PDIR,
1070
direntries[i]->d_name);
1071
_exit(EX_OSERR);
882
1072
}
883
1073
/* no return */
884
1074
}
885
1075
/* Parent process */
886
1076
close(pipefd[1]); /* Close unused write end of pipe */
887
free(filename);
888
plugin *new_plugin = getplugin(dirst->d_name);
889
if (new_plugin == NULL){
890
perror("getplugin");
891
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1077
close(plugin_fd);
1078
plugin *new_plugin = getplugin(direntries[i]->d_name);
1079
if(new_plugin == NULL){
1080
error(0, errno, "getplugin");
1081
ret = (int)(TEMP_FAILURE_RETRY
1082
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1083
NULL)));
892
1084
if(ret < 0){
893
perror("sigprocmask");
1085
error(0, errno, "sigprocmask");
894
1086
}
895
exitstatus = EXIT_FAILURE;
1087
exitstatus = EX_OSERR;
1088
free(direntries[i]);
896
1089
goto fallback;
897
1090
}
1091
free(direntries[i]);
898
1092
899
1093
new_plugin->pid = pid;
900
1094
new_plugin->fd = pipefd[0];
901
1095
902
1096
/* Unblock SIGCHLD so signal handler can be run if this process
903
1097
has already completed */
904
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1098
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1099
&sigchld_action.sa_mask,
1100
NULL));
905
1101
if(ret < 0){
906
perror("sigprocmask");
907
exitstatus = EXIT_FAILURE;
1102
error(0, errno, "sigprocmask");
1103
exitstatus = EX_OSERR;
908
1104
goto fallback;
909
1105
}
910
1106
911
1107
FD_SET(new_plugin->fd, &rfds_all);
912
1108
913
if (maxfd < new_plugin->fd){
1109
if(maxfd < new_plugin->fd){
914
1110
maxfd = new_plugin->fd;
915
1111
}
916
917
1112
}
918
1113
919
closedir(dir);
920
dir = NULL;
921
1114
free(direntries);
1115
direntries = NULL;
1116
close(dir_fd);
1117
dir_fd = -1;
1118
free_plugin(getplugin(NULL));
1119
922
1120
for(plugin *p = plugin_list; p != NULL; p = p->next){
923
1121
if(p->pid != 0){
924
1122
break;
929
1127
free_plugin_list();
930
1128
}
931
1129
}
932
1130
933
1131
/* Main loop while running plugins exist */
934
1132
while(plugin_list){
935
1133
fd_set rfds = rfds_all;
936
1134
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
937
if (select_ret == -1){
938
perror("select");
939
exitstatus = EXIT_FAILURE;
1135
if(select_ret == -1 and errno != EINTR){
1136
error(0, errno, "select");
1137
exitstatus = EX_OSERR;
940
1138
goto fallback;
941
1139
}
942
1140
/* OK, now either a process completed, or something can be read
943
1141
from one of them */
944
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1142
for(plugin *proc = plugin_list; proc != NULL;){
945
1143
/* Is this process completely done? */
946
if(proc->eof and proc->completed){
1144
if(proc->completed and proc->eof){
947
1145
/* Only accept the plugin output if it exited cleanly */
948
1146
if(not WIFEXITED(proc->status)
949
1147
or WEXITSTATUS(proc->status) != 0){
950
1148
/* Bad exit by plugin */
951
1149
952
1150
if(debug){
953
1151
if(WIFEXITED(proc->status)){
954
fprintf(stderr, "Plugin %u exited with status %d\n",
955
(unsigned int) (proc->pid),
1152
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1153
" status %d\n", proc->name,
1154
(intmax_t) (proc->pid),
956
1155
WEXITSTATUS(proc->status));
957
} else if(WIFSIGNALED(proc->status)) {
958
fprintf(stderr, "Plugin %u killed by signal %d\n",
959
(unsigned int) (proc->pid),
960
WTERMSIG(proc->status));
961
} else if(WCOREDUMP(proc->status)){
962
fprintf(stderr, "Plugin %d dumped core\n",
963
(unsigned int) (proc->pid));
1156
} else if(WIFSIGNALED(proc->status)){
1157
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1158
" signal %d: %s\n", proc->name,
1159
(intmax_t) (proc->pid),
1160
WTERMSIG(proc->status),
1161
strsignal(WTERMSIG(proc->status)));
964
1162
}
965
1163
}
966
1164
967
1165
/* Remove the plugin */
968
1166
FD_CLR(proc->fd, &rfds_all);
969
1167
970
1168
/* Block signal while modifying process_list */
971
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1169
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1170
(SIG_BLOCK,
1171
&sigchld_action.sa_mask,
1172
NULL));
972
1173
if(ret < 0){
973
perror("sigprocmask");
974
exitstatus = EXIT_FAILURE;
1174
error(0, errno, "sigprocmask");
1175
exitstatus = EX_OSERR;
975
1176
goto fallback;
976
1177
}
1178
1179
plugin *next_plugin = proc->next;
977
1180
free_plugin(proc);
1181
proc = next_plugin;
1182
978
1183
/* We are done modifying process list, so unblock signal */
979
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
980
NULL);
1184
ret = (int)(TEMP_FAILURE_RETRY
1185
(sigprocmask(SIG_UNBLOCK,
1186
&sigchld_action.sa_mask, NULL)));
981
1187
if(ret < 0){
982
perror("sigprocmask");
983
exitstatus = EXIT_FAILURE;
1188
error(0, errno, "sigprocmask");
1189
exitstatus = EX_OSERR;
984
1190
goto fallback;
985
1191
}
986
1192
987
1193
if(plugin_list == NULL){
988
1194
break;
989
1195
}
1196
990
1197
continue;
991
1198
}
992
1199
993
1200
/* This process exited nicely, so print its buffer */
994
1201
995
1202
bool bret = print_out_password(proc->buffer,
996
1203
proc->buffer_length);
997
1204
if(not bret){
998
perror("print_out_password");
999
exitstatus = EXIT_FAILURE;
1205
error(0, errno, "print_out_password");
1206
exitstatus = EX_IOERR;
1000
1207
}
1001
1208
goto fallback;
1002
1209
}
1004
1211
/* This process has not completed. Does it have any output? */
1005
1212
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1006
1213
/* This process had nothing to say at this time */
1214
proc = proc->next;
1007
1215
continue;
1008
1216
}
1009
1217
/* Before reading, make the process' data buffer large enough */
1010
1218
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1011
proc->buffer = realloc(proc->buffer, proc->buffer_size
1012
+ (size_t) BUFFER_SIZE);
1013
if (proc->buffer == NULL){
1014
perror("malloc");
1015
exitstatus = EXIT_FAILURE;
1219
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1220
+ (size_t) BUFFER_SIZE);
1221
if(new_buffer == NULL){
1222
error(0, errno, "malloc");
1223
exitstatus = EX_OSERR;
1016
1224
goto fallback;
1017
1225
}
1226
proc->buffer = new_buffer;
1018
1227
proc->buffer_size += BUFFER_SIZE;
1019
1228
}
1020
1229
/* Read from the process */
1021
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1022
BUFFER_SIZE);
1023
if(ret < 0){
1230
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1231
proc->buffer
1232
+ proc->buffer_length,
1233
BUFFER_SIZE));
1234
if(sret < 0){
1024
1235
/* Read error from this process; ignore the error */
1236
proc = proc->next;
1025
1237
continue;
1026
1238
}
1027
if(ret == 0){
1239
if(sret == 0){
1028
1240
/* got EOF */
1029
1241
proc->eof = true;
1030
1242
} else {
1031
proc->buffer_length += (size_t) ret;
1243
proc->buffer_length += (size_t) sret;
1032
1244
}
1033
1245
}
1034
1246
}
1035
1036
1247
1248
1037
1249
fallback:
1038
1250
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1251
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1252
and exitstatus != EX_OK)){
1040
1253
/* Fallback if all plugins failed, none are found or an error
1041
1254
occured */
1042
1255
bool bret;
1050
1263
}
1051
1264
bret = print_out_password(passwordbuffer, len);
1052
1265
if(not bret){
1053
perror("print_out_password");
1054
exitstatus = EXIT_FAILURE;
1266
error(0, errno, "print_out_password");
1267
exitstatus = EX_IOERR;
1055
1268
}
1056
1269
}
1057
1270
1058
1271
/* Restore old signal handler */
1059
1272
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1060
1273
if(ret == -1){
1061
perror("sigaction");
1062
exitstatus = EXIT_FAILURE;
1274
error(0, errno, "sigaction");
1275
exitstatus = EX_OSERR;
1063
1276
}
1064
1277
1065
1278
if(custom_argv != NULL){
1066
1279
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1067
1280
free(*arg);
1069
1282
free(custom_argv);
1070
1283
}
1071
1284
1072
if(dir != NULL){
1073
closedir(dir);
1285
free(direntries);
1286
1287
if(dir_fd != -1){
1288
close(dir_fd);
1074
1289
}
1075
1290
1076
/* Free the process list and kill the processes */
1291
/* Kill the processes */
1077
1292
for(plugin *p = plugin_list; p != NULL; p = p->next){
1078
1293
if(p->pid != 0){
1079
1294
close(p->fd);
1080
1295
ret = kill(p->pid, SIGTERM);
1081
1296
if(ret == -1 and errno != ESRCH){
1082
1297
/* Set-uid proccesses might not get closed */
1083
perror("kill");
1298
error(0, errno, "kill");
1084
1299
}
1085
1300
}
1086
1301
}
1087
1302
1088
1303
/* Wait for any remaining child processes to terminate */
1089
do{
1304
do {
1090
1305
ret = wait(NULL);
1091
1306
} while(ret >= 0);
1092
1307
if(errno != ECHILD){
1093
perror("wait");
1308
error(0, errno, "wait");
1094
1309
}
1095
1310
1096
1311
free_plugin_list();
1097
1312
1098
1313
free(plugindir);
1314
free(pluginhelperdir);
1099
1315
free(argfile);
1100
1316
1101
1317
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0