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- Committer: Teddy Hogeborn
- Date: 2021-02-03 10:35:45 UTC
- mfrom: (237.4.136 release)
- Revision ID: teddy@recompile.se-20210203103545-fkhhqnfu4gxx4c1j
Merge from release branch
- files added:
- DBUS-API
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
*
8
* This program is free software: you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License as
10
* published by the Free Software Foundation, either version 3 of the
11
* License, or (at your option) any later version.
12
*
13
* This program is distributed in the hope that it will be useful, but
5
* Copyright © 2008-2021 Teddy Hogeborn
6
* Copyright © 2008-2021 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
14
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
15
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
18
* General Public License for more details.
17
19
*
18
20
* You should have received a copy of the GNU General Public License
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
21
22
*
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
23
24
*/
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
26
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
27
getline(), asprintf(), O_CLOEXEC,
28
scandirat(), pipe2() */
29
#include <argp.h> /* argp_program_version,
30
argp_program_bug_address,
31
struct argp_option,
32
struct argp_state, argp_error(),
33
ARGP_NO_EXIT, argp_state_help,
34
ARGP_HELP_STD_HELP,
35
ARGP_HELP_USAGE, ARGP_HELP_EXIT_OK,
36
ARGP_KEY_ARG, ARGP_ERR_UNKNOWN,
37
struct argp, argp_parse(),
38
ARGP_IN_ORDER, ARGP_NO_HELP */
39
#include <stdbool.h> /* bool, false, true */
40
#include <sys/types.h> /* pid_t, sig_atomic_t, uid_t, gid_t,
41
getuid(), setgid(), setuid() */
27
42
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
FD_SET(), FD_ISSET(), FD_CLR */
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS() */
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
readdir(), closedir(), dirfd() */
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
47
fcntl(), setuid(), setgid(),
48
F_GETFD, F_SETFD, FD_CLOEXEC,
49
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
51
execv(), write(), read(),
52
close() */
43
#include <iso646.h> /* or, and, not */
44
#include <string.h> /* strcmp(), strdup(), strchrnul(),
45
strncmp(), strlen(), strcpy(),
46
strsep(), strchr(), strsignal() */
47
#include <stdlib.h> /* malloc(), free(), reallocarray(),
48
realloc(), EXIT_SUCCESS */
49
#include <errno.h> /* errno, EINTR, ENOMEM, ECHILD,
50
error_t, EINVAL, EMFILE, ENFILE,
51
ENOENT, ESRCH */
52
#include <stdint.h> /* SIZE_MAX */
53
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
54
getline(), asprintf(), O_CLOEXEC,
55
scandirat(), pipe2() */
56
#include <unistd.h> /* TEMP_FAILURE_RETRY(), ssize_t,
57
write(), STDOUT_FILENO, uid_t,
58
gid_t, getuid(), fchown(), close(),
59
symlink(), setgid(), setuid(),
60
faccessat(), X_OK, pipe(), pipe2(),
61
fork(), _exit(), dup2(), fexecve(),
62
read(), getpass() */
53
63
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <errno.h> /* errno */
57
#include <argp.h> /* struct argp_option, struct
58
argp_state, struct argp,
59
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
62
#include <signal.h> /* struct sigaction, sigemptyset(),
63
sigaddset(), sigaction(),
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill() */
66
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
64
FD_CLOEXEC, open(), O_RDONLY,
65
O_CLOEXEC, openat() */
66
#include <sys/wait.h> /* waitpid(), WNOHANG, WIFEXITED(),
67
WEXITSTATUS(), WIFSIGNALED(),
68
WTERMSIG(), wait() */
69
#include <error.h> /* error() */
70
#include <stdio.h> /* FILE, fprintf(), fopen(),
71
getline(), fclose(), EOF,
72
asprintf(), stderr */
73
#include <dirent.h> /* struct dirent, scandirat(),
74
alphasort() */
75
#include <sys/stat.h> /* struct stat, fstat(), S_ISDIR(),
76
lstat(), S_ISREG() */
77
#include <sys/select.h> /* fd_set, FD_ZERO(), FD_SETSIZE,
78
FD_SET(), select(), FD_CLR(),
79
FD_ISSET() */
80
#include <signal.h> /* struct sigaction, SA_NOCLDSTOP,
81
sigemptyset(), sigaddset(),
82
SIGCHLD, sigprocmask(), SIG_BLOCK,
83
SIG_UNBLOCK, kill(), SIGTERM */
84
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
85
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
86
#include <inttypes.h> /* intmax_t, strtoimax(), PRIdMAX */
87
#include <fnmatch.h> /* fnmatch(), FNM_FILE_NAME,
88
FNM_PERIOD, FNM_NOMATCH */
68
89
69
90
#define BUFFER_SIZE 256
70
91
71
92
#define PDIR "/lib/mandos/plugins.d"
93
#define PHDIR "/lib/mandos/plugin-helpers"
72
94
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
95
74
96
const char *argp_program_version = "plugin-runner " VERSION;
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
97
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
98
77
99
typedef struct plugin{
78
100
char *name; /* can be NULL or any plugin name */
81
103
char **environ;
82
104
int envc;
83
105
bool disabled;
84
106
85
107
/* Variables used for running processes*/
86
108
pid_t pid;
87
109
int fd;
98
120
99
121
/* Gets an existing plugin based on name,
100
122
or if none is found, creates a new one */
123
__attribute__((warn_unused_result))
101
124
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
125
/* Check for existing plugin with that name */
103
126
for(plugin *p = plugin_list; p != NULL; p = p->next){
104
127
if((p->name == name)
105
128
or (p->name and name and (strcmp(p->name, name) == 0))){
107
130
}
108
131
}
109
132
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
133
plugin *new_plugin = NULL;
134
do {
135
new_plugin = malloc(sizeof(plugin));
136
} while(new_plugin == NULL and errno == EINTR);
111
137
if(new_plugin == NULL){
112
138
return NULL;
113
139
}
114
140
char *copy_name = NULL;
115
141
if(name != NULL){
116
copy_name = strdup(name);
142
do {
143
copy_name = strdup(name);
144
} while(copy_name == NULL and errno == EINTR);
117
145
if(copy_name == NULL){
146
int e = errno;
118
147
free(new_plugin);
148
errno = e;
119
149
return NULL;
120
150
}
121
151
}
125
155
.disabled = false,
126
156
.next = plugin_list };
127
157
128
new_plugin->argv = malloc(sizeof(char *) * 2);
158
do {
159
new_plugin->argv = malloc(sizeof(char *) * 2);
160
} while(new_plugin->argv == NULL and errno == EINTR);
129
161
if(new_plugin->argv == NULL){
162
int e = errno;
130
163
free(copy_name);
131
164
free(new_plugin);
165
errno = e;
132
166
return NULL;
133
167
}
134
168
new_plugin->argv[0] = copy_name;
135
169
new_plugin->argv[1] = NULL;
136
170
137
new_plugin->environ = malloc(sizeof(char *));
171
do {
172
new_plugin->environ = malloc(sizeof(char *));
173
} while(new_plugin->environ == NULL and errno == EINTR);
138
174
if(new_plugin->environ == NULL){
175
int e = errno;
139
176
free(copy_name);
140
177
free(new_plugin->argv);
141
178
free(new_plugin);
179
errno = e;
142
180
return NULL;
143
181
}
144
182
new_plugin->environ[0] = NULL;
149
187
}
150
188
151
189
/* Helper function for add_argument and add_environment */
190
__attribute__((nonnull, warn_unused_result))
152
191
static bool add_to_char_array(const char *new, char ***array,
153
192
int *len){
154
193
/* Resize the pointed-to array to hold one more pointer */
155
*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
194
char **new_array = NULL;
195
do {
196
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
197
new_array = reallocarray(*array, (size_t)((*len) + 2),
198
sizeof(char *));
199
#else
200
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
201
/* overflow */
202
new_array = NULL;
203
errno = ENOMEM;
204
} else {
205
new_array = realloc(*array, (size_t)((*len) + 2)
206
* sizeof(char *));
207
}
208
#endif
209
} while(new_array == NULL and errno == EINTR);
157
210
/* Malloc check */
158
if(*array == NULL){
211
if(new_array == NULL){
159
212
return false;
160
213
}
214
*array = new_array;
161
215
/* Make a copy of the new string */
162
char *copy = strdup(new);
216
char *copy;
217
do {
218
copy = strdup(new);
219
} while(copy == NULL and errno == EINTR);
163
220
if(copy == NULL){
164
221
return false;
165
222
}
172
229
}
173
230
174
231
/* Add to a plugin's argument vector */
232
__attribute__((nonnull(2), warn_unused_result))
175
233
static bool add_argument(plugin *p, const char *arg){
176
234
if(p == NULL){
177
235
return false;
180
238
}
181
239
182
240
/* Add to a plugin's environment */
241
__attribute__((nonnull(2), warn_unused_result))
183
242
static bool add_environment(plugin *p, const char *def, bool replace){
184
243
if(p == NULL){
185
244
return false;
187
246
/* namelen = length of name of environment variable */
188
247
size_t namelen = (size_t)(strchrnul(def, '=') - def);
189
248
/* Search for this environment variable */
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
249
for(char **envdef = p->environ; *envdef != NULL; envdef++){
250
if(strncmp(*envdef, def, namelen + 1) == 0){
192
251
/* It already exists */
193
252
if(replace){
194
char *new = realloc(*e, strlen(def) + 1);
195
if(new == NULL){
253
char *new_envdef;
254
do {
255
new_envdef = realloc(*envdef, strlen(def) + 1);
256
} while(new_envdef == NULL and errno == EINTR);
257
if(new_envdef == NULL){
196
258
return false;
197
259
}
198
*e = new;
199
strcpy(*e, def);
260
*envdef = new_envdef;
261
strcpy(*envdef, def);
200
262
}
201
263
return true;
202
264
}
204
266
return add_to_char_array(def, &(p->environ), &(p->envc));
205
267
}
206
268
269
#ifndef O_CLOEXEC
207
270
/*
208
271
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
272
* Descriptor Flags".
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
273
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
211
274
*/
275
__attribute__((warn_unused_result))
212
276
static int set_cloexec_flag(int fd){
213
int ret = fcntl(fd, F_GETFD, 0);
277
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
278
/* If reading the flags failed, return error indication now. */
215
279
if(ret < 0){
216
280
return ret;
217
281
}
218
282
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
283
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
284
ret | FD_CLOEXEC));
220
285
}
286
#endif /* not O_CLOEXEC */
221
287
222
288
223
289
/* Mark processes as completed when they exit, and save their exit
237
303
/* No child processes */
238
304
break;
239
305
}
240
perror("waitpid");
306
error(0, errno, "waitpid");
241
307
}
242
308
243
309
/* A child exited, find it in process_list */
255
321
}
256
322
257
323
/* Prints out a password to stdout */
324
__attribute__((nonnull, warn_unused_result))
258
325
static bool print_out_password(const char *buffer, size_t length){
259
326
ssize_t ret;
260
327
for(size_t written = 0; written < length; written += (size_t)ret){
268
335
}
269
336
270
337
/* Removes and free a plugin from the plugin list */
338
__attribute__((nonnull))
271
339
static void free_plugin(plugin *plugin_node){
272
340
273
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
341
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
274
342
free(*arg);
275
343
}
344
free(plugin_node->name);
276
345
free(plugin_node->argv);
277
346
for(char **env = plugin_node->environ; *env != NULL; env++){
278
347
free(*env);
279
348
}
280
349
free(plugin_node->environ);
281
350
free(plugin_node->buffer);
282
351
283
352
/* Removes the plugin from the singly-linked list */
284
353
if(plugin_node == plugin_list){
285
354
/* First one - simple */
305
374
306
375
int main(int argc, char *argv[]){
307
376
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
308
378
char *argfile = NULL;
309
379
FILE *conffp;
310
size_t d_name_len;
311
DIR *dir = NULL;
312
struct dirent *dirst;
380
struct dirent **direntries = NULL;
313
381
struct stat st;
314
382
fd_set rfds_all;
315
int ret, numchars, maxfd = 0;
383
int ret, maxfd = 0;
316
384
ssize_t sret;
317
intmax_t tmpmax;
318
385
uid_t uid = 65534;
319
386
gid_t gid = 65534;
320
387
bool debug = false;
324
391
.sa_flags = SA_NOCLDSTOP };
325
392
char **custom_argv = NULL;
326
393
int custom_argc = 0;
394
int dir_fd = -1;
327
395
328
396
/* Establish a signal handler */
329
397
sigemptyset(&sigchld_action.sa_mask);
330
398
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
331
399
if(ret == -1){
332
perror("sigaddset");
333
exitstatus = EXIT_FAILURE;
400
error(0, errno, "sigaddset");
401
exitstatus = EX_OSERR;
334
402
goto fallback;
335
403
}
336
404
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
337
405
if(ret == -1){
338
perror("sigaction");
339
exitstatus = EXIT_FAILURE;
406
error(0, errno, "sigaction");
407
exitstatus = EX_OSERR;
340
408
goto fallback;
341
409
}
342
410
374
442
.doc = "Group ID the plugins will run as", .group = 3 },
375
443
{ .name = "debug", .key = 132,
376
444
.doc = "Debug mode", .group = 4 },
445
{ .name = "plugin-helper-dir", .key = 133,
446
.arg = "DIRECTORY",
447
.doc = "Specify a different plugin helper directory",
448
.group = 2 },
449
/*
450
* These reproduce what we would get without ARGP_NO_HELP
451
*/
452
{ .name = "help", .key = '?',
453
.doc = "Give this help list", .group = -1 },
454
{ .name = "usage", .key = -3,
455
.doc = "Give a short usage message", .group = -1 },
456
{ .name = "version", .key = 'V',
457
.doc = "Print program version", .group = -1 },
377
458
{ .name = NULL }
378
459
};
379
460
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
461
__attribute__((nonnull(3)))
462
error_t parse_opt(int key, char *arg, struct argp_state *state){
463
errno = 0;
382
464
switch(key){
465
char *tmp;
466
intmax_t tmp_id;
383
467
case 'g': /* --global-options */
384
if(arg != NULL){
385
char *p;
386
while((p = strsep(&arg, ",")) != NULL){
387
if(p[0] == '\0'){
388
continue;
389
}
390
if(not add_argument(getplugin(NULL), p)){
391
perror("add_argument");
392
return ARGP_ERR_UNKNOWN;
468
{
469
char *plugin_option;
470
while((plugin_option = strsep(&arg, ",")) != NULL){
471
if(not add_argument(getplugin(NULL), plugin_option)){
472
break;
393
473
}
394
474
}
475
errno = 0;
395
476
}
396
477
break;
397
478
case 'G': /* --global-env */
398
if(arg == NULL){
399
break;
400
}
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
479
if(add_environment(getplugin(NULL), arg, true)){
480
errno = 0;
403
481
}
404
482
break;
405
483
case 'o': /* --options-for */
406
if(arg != NULL){
407
char *p_name = strsep(&arg, ":");
408
if(p_name[0] == '\0' or arg == NULL){
409
break;
410
}
411
char *opt = strsep(&arg, ":");
412
if(opt[0] == '\0' or opt == NULL){
413
break;
414
}
415
char *p;
416
while((p = strsep(&opt, ",")) != NULL){
417
if(p[0] == '\0'){
418
continue;
419
}
420
if(not add_argument(getplugin(p_name), p)){
421
perror("add_argument");
422
return ARGP_ERR_UNKNOWN;
423
}
424
}
484
{
485
char *option_list = strchr(arg, ':');
486
if(option_list == NULL){
487
argp_error(state, "No colon in \"%s\"", arg);
488
errno = EINVAL;
489
break;
490
}
491
*option_list = '\0';
492
option_list++;
493
if(arg[0] == '\0'){
494
argp_error(state, "Empty plugin name");
495
errno = EINVAL;
496
break;
497
}
498
char *option;
499
while((option = strsep(&option_list, ",")) != NULL){
500
if(not add_argument(getplugin(arg), option)){
501
break;
502
}
503
}
504
errno = 0;
425
505
}
426
506
break;
427
507
case 'E': /* --env-for */
428
if(arg == NULL){
429
break;
430
}
431
508
{
432
509
char *envdef = strchr(arg, ':');
433
510
if(envdef == NULL){
511
argp_error(state, "No colon in \"%s\"", arg);
512
errno = EINVAL;
434
513
break;
435
514
}
436
515
*envdef = '\0';
437
if(not add_environment(getplugin(arg), envdef+1, true)){
438
perror("add_environment");
516
envdef++;
517
if(arg[0] == '\0'){
518
argp_error(state, "Empty plugin name");
519
errno = EINVAL;
520
break;
521
}
522
if(add_environment(getplugin(arg), envdef, true)){
523
errno = 0;
439
524
}
440
525
}
441
526
break;
442
527
case 'd': /* --disable */
443
if(arg != NULL){
528
{
444
529
plugin *p = getplugin(arg);
445
if(p == NULL){
446
return ARGP_ERR_UNKNOWN;
530
if(p != NULL){
531
p->disabled = true;
532
errno = 0;
447
533
}
448
p->disabled = true;
449
534
}
450
535
break;
451
536
case 'e': /* --enable */
452
if(arg != NULL){
537
{
453
538
plugin *p = getplugin(arg);
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
539
if(p != NULL){
540
p->disabled = false;
541
errno = 0;
456
542
}
457
p->disabled = false;
458
543
}
459
544
break;
460
545
case 128: /* --plugin-dir */
461
546
free(plugindir);
462
547
plugindir = strdup(arg);
463
if(plugindir == NULL){
464
perror("strdup");
465
}
548
if(plugindir != NULL){
549
errno = 0;
550
}
466
551
break;
467
552
case 129: /* --config-file */
468
553
/* This is already done by parse_opt_config_file() */
469
554
break;
470
555
case 130: /* --userid */
471
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
472
if(ret < 1 or tmpmax != (uid_t)tmpmax
473
or arg[numchars] != '\0'){
474
fprintf(stderr, "Bad user ID number: \"%s\", using %"
475
PRIdMAX "\n", arg, (intmax_t)uid);
476
} else {
477
uid = (uid_t)tmpmax;
556
tmp_id = strtoimax(arg, &tmp, 10);
557
if(errno != 0 or tmp == arg or *tmp != '\0'
558
or tmp_id != (uid_t)tmp_id){
559
argp_error(state, "Bad user ID number: \"%s\", using %"
560
PRIdMAX, arg, (intmax_t)uid);
561
break;
478
562
}
563
uid = (uid_t)tmp_id;
564
errno = 0;
479
565
break;
480
566
case 131: /* --groupid */
481
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
482
if(ret < 1 or tmpmax != (gid_t)tmpmax
483
or arg[numchars] != '\0'){
484
fprintf(stderr, "Bad group ID number: \"%s\", using %"
485
PRIdMAX "\n", arg, (intmax_t)gid);
486
} else {
487
gid = (gid_t)tmpmax;
567
tmp_id = strtoimax(arg, &tmp, 10);
568
if(errno != 0 or tmp == arg or *tmp != '\0'
569
or tmp_id != (gid_t)tmp_id){
570
argp_error(state, "Bad group ID number: \"%s\", using %"
571
PRIdMAX, arg, (intmax_t)gid);
572
break;
488
573
}
574
gid = (gid_t)tmp_id;
575
errno = 0;
489
576
break;
490
577
case 132: /* --debug */
491
578
debug = true;
492
579
break;
580
case 133: /* --plugin-helper-dir */
581
free(pluginhelperdir);
582
pluginhelperdir = strdup(arg);
583
if(pluginhelperdir != NULL){
584
errno = 0;
585
}
586
break;
587
/*
588
* These reproduce what we would get without ARGP_NO_HELP
589
*/
590
case '?': /* --help */
591
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
592
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
593
__builtin_unreachable();
594
case -3: /* --usage */
595
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
596
argp_state_help(state, state->out_stream,
597
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
598
__builtin_unreachable();
599
case 'V': /* --version */
600
fprintf(state->out_stream, "%s\n", argp_program_version);
601
exit(EXIT_SUCCESS);
602
break;
493
603
/*
494
604
* When adding more options before this line, remember to also add a
495
605
* "case" to the "parse_opt_config_file" function below.
498
608
/* Cryptsetup always passes an argument, which is an empty
499
609
string if "none" was specified in /etc/crypttab. So if
500
610
argument was empty, we ignore it silently. */
501
if(arg[0] != '\0'){
502
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
611
if(arg[0] == '\0'){
612
break;
503
613
}
504
break;
505
case ARGP_KEY_END:
506
break;
614
#if __GNUC__ >= 7
615
__attribute__((fallthrough));
616
#else
617
/* FALLTHROUGH */
618
#endif
507
619
default:
508
620
return ARGP_ERR_UNKNOWN;
509
621
}
510
return 0;
622
return errno; /* Set to 0 at start */
511
623
}
512
624
513
625
/* This option parser is the same as parse_opt() above, except it
515
627
error_t parse_opt_config_file(int key, char *arg,
516
628
__attribute__((unused))
517
629
struct argp_state *state){
630
errno = 0;
518
631
switch(key){
519
632
case 'g': /* --global-options */
520
633
case 'G': /* --global-env */
527
640
case 129: /* --config-file */
528
641
free(argfile);
529
642
argfile = strdup(arg);
530
if(argfile == NULL){
531
perror("strdup");
643
if(argfile != NULL){
644
errno = 0;
532
645
}
533
break;
646
break;
534
647
case 130: /* --userid */
535
648
case 131: /* --groupid */
536
649
case 132: /* --debug */
650
case 133: /* --plugin-helper-dir */
651
case '?': /* --help */
652
case -3: /* --usage */
653
case 'V': /* --version */
537
654
case ARGP_KEY_ARG:
538
case ARGP_KEY_END:
539
655
break;
540
656
default:
541
657
return ARGP_ERR_UNKNOWN;
542
658
}
543
return 0;
659
return errno;
544
660
}
545
661
546
662
struct argp argp = { .options = options,
550
666
551
667
/* Parse using parse_opt_config_file() in order to get the custom
552
668
config file location, if any. */
553
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
554
if(ret == ARGP_ERR_UNKNOWN){
555
fprintf(stderr, "Unknown error while parsing arguments\n");
556
exitstatus = EXIT_FAILURE;
669
ret = argp_parse(&argp, argc, argv,
670
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
671
NULL, NULL);
672
switch(ret){
673
case 0:
674
break;
675
case ENOMEM:
676
default:
677
errno = ret;
678
error(0, errno, "argp_parse");
679
exitstatus = EX_OSERR;
680
goto fallback;
681
case EINVAL:
682
exitstatus = EX_USAGE;
557
683
goto fallback;
558
684
}
559
685
565
691
conffp = fopen(AFILE, "r");
566
692
} else {
567
693
conffp = fopen(argfile, "r");
568
}
694
}
569
695
if(conffp != NULL){
570
696
char *org_line = NULL;
571
697
char *p, *arg, *new_arg, *line;
572
698
size_t size = 0;
573
699
const char whitespace_delims[] = " \r\t\f\v\n";
574
700
const char comment_delim[] = "#";
575
701
576
702
custom_argc = 1;
577
703
custom_argv = malloc(sizeof(char*) * 2);
578
704
if(custom_argv == NULL){
579
perror("malloc");
580
exitstatus = EXIT_FAILURE;
705
error(0, errno, "malloc");
706
exitstatus = EX_OSERR;
581
707
goto fallback;
582
708
}
583
709
custom_argv[0] = argv[0];
584
710
custom_argv[1] = NULL;
585
711
586
712
/* for each line in the config file, strip whitespace and ignore
587
713
commented text */
588
714
while(true){
590
716
if(sret == -1){
591
717
break;
592
718
}
593
719
594
720
line = org_line;
595
721
arg = strsep(&line, comment_delim);
596
722
while((p = strsep(&arg, whitespace_delims)) != NULL){
599
725
}
600
726
new_arg = strdup(p);
601
727
if(new_arg == NULL){
602
perror("strdup");
603
exitstatus = EXIT_FAILURE;
728
error(0, errno, "strdup");
729
exitstatus = EX_OSERR;
604
730
free(org_line);
605
731
goto fallback;
606
732
}
607
733
608
734
custom_argc += 1;
609
custom_argv = realloc(custom_argv, sizeof(char *)
610
* ((unsigned int) custom_argc + 1));
611
if(custom_argv == NULL){
612
perror("realloc");
613
exitstatus = EXIT_FAILURE;
614
free(org_line);
615
goto fallback;
735
{
736
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
737
char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
738
sizeof(char *));
739
#else
740
char **new_argv = NULL;
741
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
742
/* overflow */
743
errno = ENOMEM;
744
} else {
745
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
746
* sizeof(char *));
747
}
748
#endif
749
if(new_argv == NULL){
750
error(0, errno, "reallocarray");
751
exitstatus = EX_OSERR;
752
free(new_arg);
753
free(org_line);
754
goto fallback;
755
} else {
756
custom_argv = new_argv;
757
}
616
758
}
617
759
custom_argv[custom_argc-1] = new_arg;
618
custom_argv[custom_argc] = NULL;
760
custom_argv[custom_argc] = NULL;
619
761
}
620
762
}
763
do {
764
ret = fclose(conffp);
765
} while(ret == EOF and errno == EINTR);
766
if(ret == EOF){
767
error(0, errno, "fclose");
768
exitstatus = EX_IOERR;
769
goto fallback;
770
}
621
771
free(org_line);
622
772
} else {
623
773
/* Check for harmful errors and go to fallback. Other errors might
624
774
not affect opening plugins */
625
775
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
626
perror("fopen");
627
exitstatus = EXIT_FAILURE;
776
error(0, errno, "fopen");
777
exitstatus = EX_OSERR;
628
778
goto fallback;
629
779
}
630
780
}
631
/* If there was any arguments from configuration file,
632
pass them to parser as command arguments */
781
/* If there were any arguments from the configuration file, pass
782
them to parser as command line arguments */
633
783
if(custom_argv != NULL){
634
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
635
0, NULL);
636
if(ret == ARGP_ERR_UNKNOWN){
637
fprintf(stderr, "Unknown error while parsing arguments\n");
638
exitstatus = EXIT_FAILURE;
784
ret = argp_parse(&argp, custom_argc, custom_argv,
785
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
786
NULL, NULL);
787
switch(ret){
788
case 0:
789
break;
790
case ENOMEM:
791
default:
792
errno = ret;
793
error(0, errno, "argp_parse");
794
exitstatus = EX_OSERR;
795
goto fallback;
796
case EINVAL:
797
exitstatus = EX_CONFIG;
639
798
goto fallback;
640
799
}
641
800
}
642
801
643
802
/* Parse actual command line arguments, to let them override the
644
803
config file */
645
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
646
if(ret == ARGP_ERR_UNKNOWN){
647
fprintf(stderr, "Unknown error while parsing arguments\n");
648
exitstatus = EXIT_FAILURE;
649
goto fallback;
804
ret = argp_parse(&argp, argc, argv,
805
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
806
NULL, NULL);
807
switch(ret){
808
case 0:
809
break;
810
case ENOMEM:
811
default:
812
errno = ret;
813
error(0, errno, "argp_parse");
814
exitstatus = EX_OSERR;
815
goto fallback;
816
case EINVAL:
817
exitstatus = EX_USAGE;
818
goto fallback;
819
}
820
821
{
822
char *pluginhelperenv;
823
bool bret = true;
824
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
825
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
826
if(ret != -1){
827
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
828
}
829
if(ret == -1 or not bret){
830
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
831
" environment variable to \"%s\" for all plugins\n",
832
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
833
}
834
if(ret != -1){
835
free(pluginhelperenv);
836
}
650
837
}
651
838
652
839
if(debug){
653
for(plugin *p = plugin_list; p != NULL; p=p->next){
840
for(plugin *p = plugin_list; p != NULL; p = p->next){
654
841
fprintf(stderr, "Plugin: %s has %d arguments\n",
655
842
p->name ? p->name : "Global", p->argc - 1);
656
843
for(char **a = p->argv; *a != NULL; a++){
663
850
}
664
851
}
665
852
666
/* Strip permissions down to nobody */
853
if(getuid() == 0){
854
/* Work around Debian bug #633582:
855
<https://bugs.debian.org/633582> */
856
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
857
if(plugindir_fd == -1){
858
if(errno != ENOENT){
859
error(0, errno, "open(\"" PDIR "\")");
860
}
861
} else {
862
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
863
if(ret == -1){
864
error(0, errno, "fstat");
865
} else {
866
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
867
ret = fchown(plugindir_fd, uid, gid);
868
if(ret == -1){
869
error(0, errno, "fchown");
870
}
871
}
872
}
873
close(plugindir_fd);
874
}
875
876
/* Work around Debian bug #981302
877
<https://bugs.debian.org/981302> */
878
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
879
ret = symlink("/proc/self/fd", "/dev/fd");
880
if(ret == -1){
881
error(0, errno, "Failed to create /dev/fd symlink");
882
}
883
}
884
}
885
886
/* Lower permissions */
887
ret = setgid(gid);
888
if(ret == -1){
889
error(0, errno, "setgid");
890
}
667
891
ret = setuid(uid);
668
892
if(ret == -1){
669
perror("setuid");
670
}
671
setgid(gid);
672
if(ret == -1){
673
perror("setgid");
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 */
893
error(0, errno, "setuid");
894
}
895
896
/* Open plugin directory with close_on_exec flag */
689
897
{
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;
898
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
899
#ifdef O_CLOEXEC
900
O_CLOEXEC
901
#else /* not O_CLOEXEC */
902
0
903
#endif /* not O_CLOEXEC */
904
);
905
if(dir_fd == -1){
906
error(0, errno, "Could not open plugin dir");
907
exitstatus = EX_UNAVAILABLE;
908
goto fallback;
909
}
910
911
#ifndef O_CLOEXEC
912
/* Set the FD_CLOEXEC flag on the directory */
913
ret = set_cloexec_flag(dir_fd);
914
if(ret < 0){
915
error(0, errno, "set_cloexec_flag");
916
exitstatus = EX_OSERR;
917
goto fallback;
918
}
919
#endif /* O_CLOEXEC */
920
}
921
922
int good_name(const struct dirent * const dirent){
923
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
924
"*.dpkg-old", "*.dpkg-bak",
925
"*.dpkg-divert", NULL };
926
#ifdef __GNUC__
927
#pragma GCC diagnostic push
928
#pragma GCC diagnostic ignored "-Wcast-qual"
929
#endif
930
for(const char **pat = (const char **)patterns;
931
*pat != NULL; pat++){
932
#ifdef __GNUC__
933
#pragma GCC diagnostic pop
934
#endif
935
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
936
!= FNM_NOMATCH){
937
if(debug){
938
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
939
" matching pattern %s\n", dirent->d_name, *pat);
940
}
941
return 0;
697
942
}
698
943
}
944
return 1;
945
}
946
947
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
948
alphasort);
949
if(numplugins == -1){
950
error(0, errno, "Could not scan plugin dir");
951
direntries = NULL;
952
exitstatus = EX_OSERR;
953
goto fallback;
699
954
}
700
955
701
956
FD_ZERO(&rfds_all);
702
957
703
958
/* Read and execute any executable in the plugin directory*/
704
while(true){
705
dirst = readdir(dir);
706
707
/* All directory entries have been processed */
708
if(dirst == NULL){
709
if(errno == EBADF){
710
perror("readdir");
711
exitstatus = EXIT_FAILURE;
712
goto fallback;
713
}
714
break;
715
}
716
717
d_name_len = strlen(dirst->d_name);
718
719
/* Ignore dotfiles, backup files and other junk */
720
{
721
bool bad_name = false;
722
723
const char const *bad_prefixes[] = { ".", "#", NULL };
724
725
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
726
".dpkg-old",
727
".dpkg-bak",
728
".dpkg-divert", NULL };
729
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
730
size_t pre_len = strlen(*pre);
731
if((d_name_len >= pre_len)
732
and strncmp((dirst->d_name), *pre, pre_len) == 0){
733
if(debug){
734
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
735
" with bad prefix %s\n", dirst->d_name, *pre);
736
}
737
bad_name = true;
738
break;
739
}
740
}
741
if(bad_name){
742
continue;
743
}
744
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
745
size_t suf_len = strlen(*suf);
746
if((d_name_len >= suf_len)
747
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
748
== 0)){
749
if(debug){
750
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
751
" with bad suffix %s\n", dirst->d_name, *suf);
752
}
753
bad_name = true;
754
break;
755
}
756
}
757
758
if(bad_name){
759
continue;
760
}
761
}
762
763
char *filename;
764
if(plugindir == NULL){
765
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
766
} else {
767
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
768
}
769
if(ret < 0){
770
perror("asprintf");
959
for(int i = 0; i < numplugins; i++){
960
961
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
962
if(plugin_fd == -1){
963
error(0, errno, "Could not open plugin");
964
free(direntries[i]);
771
965
continue;
772
966
}
773
774
ret = stat(filename, &st);
967
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
775
968
if(ret == -1){
776
perror("stat");
777
free(filename);
969
error(0, errno, "stat");
970
close(plugin_fd);
971
free(direntries[i]);
778
972
continue;
779
973
}
780
974
781
975
/* Ignore non-executable files */
782
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
976
if(not S_ISREG(st.st_mode)
977
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
978
X_OK, 0)) != 0)){
783
979
if(debug){
784
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
785
" with bad type or mode\n", filename);
980
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
981
" with bad type or mode\n",
982
plugindir != NULL ? plugindir : PDIR,
983
direntries[i]->d_name);
786
984
}
787
free(filename);
985
close(plugin_fd);
986
free(direntries[i]);
788
987
continue;
789
988
}
790
989
791
plugin *p = getplugin(dirst->d_name);
990
plugin *p = getplugin(direntries[i]->d_name);
792
991
if(p == NULL){
793
perror("getplugin");
794
free(filename);
992
error(0, errno, "getplugin");
993
close(plugin_fd);
994
free(direntries[i]);
795
995
continue;
796
996
}
797
997
if(p->disabled){
798
998
if(debug){
799
999
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
800
dirst->d_name);
1000
direntries[i]->d_name);
801
1001
}
802
free(filename);
1002
close(plugin_fd);
1003
free(direntries[i]);
803
1004
continue;
804
1005
}
805
1006
{
808
1009
if(g != NULL){
809
1010
for(char **a = g->argv + 1; *a != NULL; a++){
810
1011
if(not add_argument(p, *a)){
811
perror("add_argument");
1012
error(0, errno, "add_argument");
812
1013
}
813
1014
}
814
1015
/* Add global environment variables */
815
1016
for(char **e = g->environ; *e != NULL; e++){
816
1017
if(not add_environment(p, *e, false)){
817
perror("add_environment");
1018
error(0, errno, "add_environment");
818
1019
}
819
1020
}
820
1021
}
821
1022
}
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. */
1023
/* If this plugin has any environment variables, we need to
1024
duplicate the environment from this process, too. */
825
1025
if(p->environ[0] != NULL){
826
1026
for(char **e = environ; *e != NULL; e++){
827
1027
if(not add_environment(p, *e, false)){
828
perror("add_environment");
1028
error(0, errno, "add_environment");
829
1029
}
830
1030
}
831
1031
}
832
1032
833
1033
int pipefd[2];
834
ret = pipe(pipefd);
1034
#ifndef O_CLOEXEC
1035
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1036
#else /* O_CLOEXEC */
1037
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1038
#endif /* O_CLOEXEC */
835
1039
if(ret == -1){
836
perror("pipe");
837
exitstatus = EXIT_FAILURE;
838
goto fallback;
839
}
1040
error(0, errno, "pipe");
1041
exitstatus = EX_OSERR;
1042
free(direntries[i]);
1043
goto fallback;
1044
}
1045
if(pipefd[0] >= FD_SETSIZE){
1046
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1047
FD_SETSIZE);
1048
close(pipefd[0]);
1049
close(pipefd[1]);
1050
exitstatus = EX_OSERR;
1051
free(direntries[i]);
1052
goto fallback;
1053
}
1054
#ifndef O_CLOEXEC
840
1055
/* Ask OS to automatic close the pipe on exec */
841
1056
ret = set_cloexec_flag(pipefd[0]);
842
1057
if(ret < 0){
843
perror("set_cloexec_flag");
844
exitstatus = EXIT_FAILURE;
1058
error(0, errno, "set_cloexec_flag");
1059
close(pipefd[0]);
1060
close(pipefd[1]);
1061
exitstatus = EX_OSERR;
1062
free(direntries[i]);
845
1063
goto fallback;
846
1064
}
847
1065
ret = set_cloexec_flag(pipefd[1]);
848
1066
if(ret < 0){
849
perror("set_cloexec_flag");
850
exitstatus = EXIT_FAILURE;
1067
error(0, errno, "set_cloexec_flag");
1068
close(pipefd[0]);
1069
close(pipefd[1]);
1070
exitstatus = EX_OSERR;
1071
free(direntries[i]);
851
1072
goto fallback;
852
1073
}
1074
#endif /* not O_CLOEXEC */
853
1075
/* Block SIGCHLD until process is safely in process list */
854
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1076
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1077
&sigchld_action.sa_mask,
1078
NULL));
855
1079
if(ret < 0){
856
perror("sigprocmask");
857
exitstatus = EXIT_FAILURE;
1080
error(0, errno, "sigprocmask");
1081
exitstatus = EX_OSERR;
1082
free(direntries[i]);
858
1083
goto fallback;
859
1084
}
860
1085
/* Starting a new process to be watched */
861
pid_t pid = fork();
1086
pid_t pid;
1087
do {
1088
pid = fork();
1089
} while(pid == -1 and errno == EINTR);
862
1090
if(pid == -1){
863
perror("fork");
864
exitstatus = EXIT_FAILURE;
1091
error(0, errno, "fork");
1092
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1093
&sigchld_action.sa_mask, NULL));
1094
close(pipefd[0]);
1095
close(pipefd[1]);
1096
exitstatus = EX_OSERR;
1097
free(direntries[i]);
865
1098
goto fallback;
866
1099
}
867
1100
if(pid == 0){
868
1101
/* this is the child process */
869
1102
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
870
1103
if(ret < 0){
871
perror("sigaction");
872
_exit(EXIT_FAILURE);
1104
error(0, errno, "sigaction");
1105
_exit(EX_OSERR);
873
1106
}
874
1107
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
875
1108
if(ret < 0){
876
perror("sigprocmask");
877
_exit(EXIT_FAILURE);
1109
error(0, errno, "sigprocmask");
1110
_exit(EX_OSERR);
878
1111
}
879
1112
880
1113
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
881
1114
if(ret == -1){
882
perror("dup2");
883
_exit(EXIT_FAILURE);
1115
error(0, errno, "dup2");
1116
_exit(EX_OSERR);
884
1117
}
885
1118
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
}
1119
if(fexecve(plugin_fd, p->argv,
1120
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1121
error(0, errno, "fexecve for %s/%s",
1122
plugindir != NULL ? plugindir : PDIR,
1123
direntries[i]->d_name);
1124
_exit(EX_OSERR);
901
1125
}
902
1126
/* no return */
903
1127
}
904
1128
/* Parent process */
905
1129
close(pipefd[1]); /* Close unused write end of pipe */
906
free(filename);
907
plugin *new_plugin = getplugin(dirst->d_name);
1130
close(plugin_fd);
1131
plugin *new_plugin = getplugin(direntries[i]->d_name);
908
1132
if(new_plugin == NULL){
909
perror("getplugin");
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1133
error(0, errno, "getplugin");
1134
ret = (int)(TEMP_FAILURE_RETRY
1135
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1136
NULL)));
911
1137
if(ret < 0){
912
perror("sigprocmask");
1138
error(0, errno, "sigprocmask");
913
1139
}
914
exitstatus = EXIT_FAILURE;
1140
exitstatus = EX_OSERR;
1141
free(direntries[i]);
915
1142
goto fallback;
916
1143
}
1144
free(direntries[i]);
917
1145
918
1146
new_plugin->pid = pid;
919
1147
new_plugin->fd = pipefd[0];
920
1148
1149
if(debug){
1150
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1151
new_plugin->name, (intmax_t) (new_plugin->pid));
1152
}
1153
921
1154
/* Unblock SIGCHLD so signal handler can be run if this process
922
1155
has already completed */
923
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1156
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1157
&sigchld_action.sa_mask,
1158
NULL));
924
1159
if(ret < 0){
925
perror("sigprocmask");
926
exitstatus = EXIT_FAILURE;
1160
error(0, errno, "sigprocmask");
1161
exitstatus = EX_OSERR;
927
1162
goto fallback;
928
1163
}
929
1164
934
1169
}
935
1170
}
936
1171
937
closedir(dir);
938
dir = NULL;
1172
free(direntries);
1173
direntries = NULL;
1174
close(dir_fd);
1175
dir_fd = -1;
1176
free_plugin(getplugin(NULL));
939
1177
940
1178
for(plugin *p = plugin_list; p != NULL; p = p->next){
941
1179
if(p->pid != 0){
952
1190
while(plugin_list){
953
1191
fd_set rfds = rfds_all;
954
1192
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
955
if(select_ret == -1){
956
perror("select");
957
exitstatus = EXIT_FAILURE;
1193
if(select_ret == -1 and errno != EINTR){
1194
error(0, errno, "select");
1195
exitstatus = EX_OSERR;
958
1196
goto fallback;
959
1197
}
960
1198
/* OK, now either a process completed, or something can be read
966
1204
if(not WIFEXITED(proc->status)
967
1205
or WEXITSTATUS(proc->status) != 0){
968
1206
/* Bad exit by plugin */
969
1207
970
1208
if(debug){
971
1209
if(WIFEXITED(proc->status)){
972
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
973
" %d\n", (intmax_t) (proc->pid),
1210
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1211
" status %d\n", proc->name,
1212
(intmax_t) (proc->pid),
974
1213
WEXITSTATUS(proc->status));
975
1214
} else if(WIFSIGNALED(proc->status)){
976
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
977
" %d\n", (intmax_t) (proc->pid),
978
WTERMSIG(proc->status));
979
} else if(WCOREDUMP(proc->status)){
980
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
981
(intmax_t) (proc->pid));
1215
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1216
" signal %d: %s\n", proc->name,
1217
(intmax_t) (proc->pid),
1218
WTERMSIG(proc->status),
1219
strsignal(WTERMSIG(proc->status)));
982
1220
}
983
1221
}
984
1222
985
1223
/* Remove the plugin */
986
1224
FD_CLR(proc->fd, &rfds_all);
987
1225
988
1226
/* Block signal while modifying process_list */
989
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1227
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1228
(SIG_BLOCK,
1229
&sigchld_action.sa_mask,
1230
NULL));
990
1231
if(ret < 0){
991
perror("sigprocmask");
992
exitstatus = EXIT_FAILURE;
1232
error(0, errno, "sigprocmask");
1233
exitstatus = EX_OSERR;
993
1234
goto fallback;
994
1235
}
995
1236
998
1239
proc = next_plugin;
999
1240
1000
1241
/* We are done modifying process list, so unblock signal */
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1002
NULL);
1242
ret = (int)(TEMP_FAILURE_RETRY
1243
(sigprocmask(SIG_UNBLOCK,
1244
&sigchld_action.sa_mask, NULL)));
1003
1245
if(ret < 0){
1004
perror("sigprocmask");
1005
exitstatus = EXIT_FAILURE;
1246
error(0, errno, "sigprocmask");
1247
exitstatus = EX_OSERR;
1006
1248
goto fallback;
1007
1249
}
1008
1250
1018
1260
bool bret = print_out_password(proc->buffer,
1019
1261
proc->buffer_length);
1020
1262
if(not bret){
1021
perror("print_out_password");
1022
exitstatus = EXIT_FAILURE;
1263
error(0, errno, "print_out_password");
1264
exitstatus = EX_IOERR;
1023
1265
}
1024
1266
goto fallback;
1025
1267
}
1032
1274
}
1033
1275
/* Before reading, make the process' data buffer large enough */
1034
1276
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1035
proc->buffer = realloc(proc->buffer, proc->buffer_size
1036
+ (size_t) BUFFER_SIZE);
1037
if(proc->buffer == NULL){
1038
perror("malloc");
1039
exitstatus = EXIT_FAILURE;
1277
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1278
+ (size_t) BUFFER_SIZE);
1279
if(new_buffer == NULL){
1280
error(0, errno, "malloc");
1281
exitstatus = EX_OSERR;
1040
1282
goto fallback;
1041
1283
}
1284
proc->buffer = new_buffer;
1042
1285
proc->buffer_size += BUFFER_SIZE;
1043
1286
}
1044
1287
/* Read from the process */
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1046
BUFFER_SIZE);
1288
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1289
proc->buffer
1290
+ proc->buffer_length,
1291
BUFFER_SIZE));
1047
1292
if(sret < 0){
1048
1293
/* Read error from this process; ignore the error */
1049
1294
proc = proc->next;
1057
1302
}
1058
1303
}
1059
1304
}
1060
1061
1305
1306
1062
1307
fallback:
1063
1308
1064
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1309
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1310
and exitstatus != EX_OK)){
1065
1311
/* Fallback if all plugins failed, none are found or an error
1066
1312
occured */
1067
1313
bool bret;
1075
1321
}
1076
1322
bret = print_out_password(passwordbuffer, len);
1077
1323
if(not bret){
1078
perror("print_out_password");
1079
exitstatus = EXIT_FAILURE;
1324
error(0, errno, "print_out_password");
1325
exitstatus = EX_IOERR;
1080
1326
}
1081
1327
}
1082
1328
1083
1329
/* Restore old signal handler */
1084
1330
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1085
1331
if(ret == -1){
1086
perror("sigaction");
1087
exitstatus = EXIT_FAILURE;
1332
error(0, errno, "sigaction");
1333
exitstatus = EX_OSERR;
1088
1334
}
1089
1335
1090
1336
if(custom_argv != NULL){
1094
1340
free(custom_argv);
1095
1341
}
1096
1342
1097
if(dir != NULL){
1098
closedir(dir);
1343
free(direntries);
1344
1345
if(dir_fd != -1){
1346
close(dir_fd);
1099
1347
}
1100
1348
1101
1349
/* Kill the processes */
1105
1353
ret = kill(p->pid, SIGTERM);
1106
1354
if(ret == -1 and errno != ESRCH){
1107
1355
/* Set-uid proccesses might not get closed */
1108
perror("kill");
1356
error(0, errno, "kill");
1109
1357
}
1110
1358
}
1111
1359
}
1112
1360
1113
1361
/* Wait for any remaining child processes to terminate */
1114
do{
1362
do {
1115
1363
ret = wait(NULL);
1116
1364
} while(ret >= 0);
1117
1365
if(errno != ECHILD){
1118
perror("wait");
1366
error(0, errno, "wait");
1119
1367
}
1120
1368
1121
1369
free_plugin_list();
1122
1370
1123
1371
free(plugindir);
1372
free(pluginhelperdir);
1124
1373
free(argfile);
1125
1374
1126
1375
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0