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- Committer: Teddy Hogeborn
- Date: 2024-09-09 04:24:39 UTC
- Revision ID: teddy@recompile.se-20240909042439-j85mr20uli2hnyis
Eliminate compiler warnings
Many programs use nested functions, which now result in a linker
warning about executable stack. Hide this warning. Also, rewrite a
loop in the plymouth plugin to avoid warning about signed overflow.
This change also makes the plugin pick the alphabetically first
process entry instead of the last, in case many plymouth processes are
found (which should be unlikely).
* Makefile (plugin-runner, dracut-module/password-agent,
plugins.d/password-prompt, plugins.d/mandos-client,
plugins.d/plymouth): New target; set LDFLAGS to add "-Xlinker
--no-warn-execstack".
* plugins.d/plymouth.c (get_pid): When no pid files are found, and we
are looking through the process list, go though it from the start
instead of from the end, i.e. in normal alphabetical order and not
in reverse order.
Many programs use nested functions, which now result in a linker
warning about executable stack. Hide this warning. Also, rewrite a
loop in the plymouth plugin to avoid warning about signed overflow.
This change also makes the plugin pick the alphabetically first
process entry instead of the last, in case many plymouth processes are
found (which should be unlikely).
* Makefile (plugin-runner, dracut-module/password-agent,
plugins.d/password-prompt, plugins.d/mandos-client,
plugins.d/plymouth): New target; set LDFLAGS to add "-Xlinker
--no-warn-execstack".
* plugins.d/plymouth.c (get_pid): When no pid files are found, and we
are looking through the process list, go though it from the start
instead of from the end, i.e. in normal alphabetical order and not
in reverse order.
- 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 © 2008-2022 Teddy Hogeborn
6
* Copyright © 2008-2022 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(), sig_atomic_t
66
*/
67
#include <errno.h> /* errno, EBADF */
68
#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 */
69
89
70
90
#define BUFFER_SIZE 256
71
91
72
92
#define PDIR "/lib/mandos/plugins.d"
93
#define PHDIR "/lib/mandos/plugin-helpers"
73
94
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
74
95
75
96
const char *argp_program_version = "plugin-runner " VERSION;
76
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
97
const char *argp_program_bug_address = "<mandos@recompile.se>";
77
98
78
99
typedef struct plugin{
79
100
char *name; /* can be NULL or any plugin name */
82
103
char **environ;
83
104
int envc;
84
105
bool disabled;
85
106
86
107
/* Variables used for running processes*/
87
108
pid_t pid;
88
109
int fd;
99
120
100
121
/* Gets an existing plugin based on name,
101
122
or if none is found, creates a new one */
123
__attribute__((warn_unused_result))
102
124
static plugin *getplugin(char *name){
103
/* Check for exiting plugin with that name */
125
/* Check for existing plugin with that name */
104
126
for(plugin *p = plugin_list; p != NULL; p = p->next){
105
127
if((p->name == name)
106
128
or (p->name and name and (strcmp(p->name, name) == 0))){
108
130
}
109
131
}
110
132
/* Create a new plugin */
111
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);
112
137
if(new_plugin == NULL){
113
138
return NULL;
114
139
}
115
140
char *copy_name = NULL;
116
141
if(name != NULL){
117
copy_name = strdup(name);
142
do {
143
copy_name = strdup(name);
144
} while(copy_name == NULL and errno == EINTR);
118
145
if(copy_name == NULL){
146
int e = errno;
119
147
free(new_plugin);
148
errno = e;
120
149
return NULL;
121
150
}
122
151
}
126
155
.disabled = false,
127
156
.next = plugin_list };
128
157
129
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);
130
161
if(new_plugin->argv == NULL){
162
int e = errno;
131
163
free(copy_name);
132
164
free(new_plugin);
165
errno = e;
133
166
return NULL;
134
167
}
135
168
new_plugin->argv[0] = copy_name;
136
169
new_plugin->argv[1] = NULL;
137
170
138
new_plugin->environ = malloc(sizeof(char *));
171
do {
172
new_plugin->environ = malloc(sizeof(char *));
173
} while(new_plugin->environ == NULL and errno == EINTR);
139
174
if(new_plugin->environ == NULL){
175
int e = errno;
140
176
free(copy_name);
141
177
free(new_plugin->argv);
142
178
free(new_plugin);
179
errno = e;
143
180
return NULL;
144
181
}
145
182
new_plugin->environ[0] = NULL;
150
187
}
151
188
152
189
/* Helper function for add_argument and add_environment */
190
__attribute__((nonnull, warn_unused_result))
153
191
static bool add_to_char_array(const char *new, char ***array,
154
192
int *len){
155
193
/* Resize the pointed-to array to hold one more pointer */
156
*array = realloc(*array, sizeof(char *)
157
* (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);
158
210
/* Malloc check */
159
if(*array == NULL){
211
if(new_array == NULL){
160
212
return false;
161
213
}
214
*array = new_array;
162
215
/* Make a copy of the new string */
163
char *copy = strdup(new);
216
char *copy;
217
do {
218
copy = strdup(new);
219
} while(copy == NULL and errno == EINTR);
164
220
if(copy == NULL){
165
221
return false;
166
222
}
173
229
}
174
230
175
231
/* Add to a plugin's argument vector */
232
__attribute__((nonnull(2), warn_unused_result))
176
233
static bool add_argument(plugin *p, const char *arg){
177
234
if(p == NULL){
178
235
return false;
181
238
}
182
239
183
240
/* Add to a plugin's environment */
241
__attribute__((nonnull(2), warn_unused_result))
184
242
static bool add_environment(plugin *p, const char *def, bool replace){
185
243
if(p == NULL){
186
244
return false;
188
246
/* namelen = length of name of environment variable */
189
247
size_t namelen = (size_t)(strchrnul(def, '=') - def);
190
248
/* Search for this environment variable */
191
for(char **e = p->environ; *e != NULL; e++){
192
if(strncmp(*e, def, namelen + 1) == 0){
249
for(char **envdef = p->environ; *envdef != NULL; envdef++){
250
if(strncmp(*envdef, def, namelen + 1) == 0){
193
251
/* It already exists */
194
252
if(replace){
195
char *new = realloc(*e, strlen(def) + 1);
196
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){
197
258
return false;
198
259
}
199
*e = new;
200
strcpy(*e, def);
260
*envdef = new_envdef;
261
strcpy(*envdef, def);
201
262
}
202
263
return true;
203
264
}
205
266
return add_to_char_array(def, &(p->environ), &(p->envc));
206
267
}
207
268
269
#ifndef O_CLOEXEC
208
270
/*
209
271
* Based on the example in the GNU LibC manual chapter 13.13 "File
210
272
* Descriptor Flags".
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
273
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
212
274
*/
275
__attribute__((warn_unused_result))
213
276
static int set_cloexec_flag(int fd){
214
int ret = fcntl(fd, F_GETFD, 0);
277
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
215
278
/* If reading the flags failed, return error indication now. */
216
279
if(ret < 0){
217
280
return ret;
218
281
}
219
282
/* Store modified flag word in the descriptor. */
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
283
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
284
ret | FD_CLOEXEC));
221
285
}
286
#endif /* not O_CLOEXEC */
222
287
223
288
224
289
/* Mark processes as completed when they exit, and save their exit
238
303
/* No child processes */
239
304
break;
240
305
}
241
perror("waitpid");
306
error(0, errno, "waitpid");
242
307
}
243
308
244
309
/* A child exited, find it in process_list */
256
321
}
257
322
258
323
/* Prints out a password to stdout */
324
__attribute__((nonnull, warn_unused_result))
259
325
static bool print_out_password(const char *buffer, size_t length){
260
326
ssize_t ret;
261
327
for(size_t written = 0; written < length; written += (size_t)ret){
269
335
}
270
336
271
337
/* Removes and free a plugin from the plugin list */
338
__attribute__((nonnull))
272
339
static void free_plugin(plugin *plugin_node){
273
340
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
341
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
275
342
free(*arg);
276
343
}
344
free(plugin_node->name);
277
345
free(plugin_node->argv);
278
346
for(char **env = plugin_node->environ; *env != NULL; env++){
279
347
free(*env);
280
348
}
281
349
free(plugin_node->environ);
282
350
free(plugin_node->buffer);
283
351
284
352
/* Removes the plugin from the singly-linked list */
285
353
if(plugin_node == plugin_list){
286
354
/* First one - simple */
306
374
307
375
int main(int argc, char *argv[]){
308
376
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
309
378
char *argfile = NULL;
310
379
FILE *conffp;
311
size_t d_name_len;
312
DIR *dir = NULL;
313
struct dirent *dirst;
380
struct dirent **direntries = NULL;
314
381
struct stat st;
315
382
fd_set rfds_all;
316
int ret, numchars, maxfd = 0;
383
int ret, maxfd = 0;
317
384
ssize_t sret;
318
intmax_t tmpmax;
319
385
uid_t uid = 65534;
320
386
gid_t gid = 65534;
321
387
bool debug = false;
325
391
.sa_flags = SA_NOCLDSTOP };
326
392
char **custom_argv = NULL;
327
393
int custom_argc = 0;
394
int dir_fd = -1;
328
395
329
396
/* Establish a signal handler */
330
397
sigemptyset(&sigchld_action.sa_mask);
331
398
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
332
399
if(ret == -1){
333
perror("sigaddset");
334
exitstatus = EXIT_FAILURE;
400
error(0, errno, "sigaddset");
401
exitstatus = EX_OSERR;
335
402
goto fallback;
336
403
}
337
404
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
338
405
if(ret == -1){
339
perror("sigaction");
340
exitstatus = EXIT_FAILURE;
406
error(0, errno, "sigaction");
407
exitstatus = EX_OSERR;
341
408
goto fallback;
342
409
}
343
410
375
442
.doc = "Group ID the plugins will run as", .group = 3 },
376
443
{ .name = "debug", .key = 132,
377
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 },
378
458
{ .name = NULL }
379
459
};
380
460
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
461
__attribute__((nonnull(3)))
462
error_t parse_opt(int key, char *arg, struct argp_state *state){
463
errno = 0;
383
464
switch(key){
465
char *tmp;
466
intmax_t tmp_id;
384
467
case 'g': /* --global-options */
385
if(arg != NULL){
468
{
386
469
char *plugin_option;
387
470
while((plugin_option = strsep(&arg, ",")) != NULL){
388
if(plugin_option[0] == '\0'){
389
continue;
390
}
391
471
if(not add_argument(getplugin(NULL), plugin_option)){
392
perror("add_argument");
393
return ARGP_ERR_UNKNOWN;
472
break;
394
473
}
395
474
}
475
errno = 0;
396
476
}
397
477
break;
398
478
case 'G': /* --global-env */
399
if(arg == NULL){
400
break;
401
}
402
if(not add_environment(getplugin(NULL), arg, true)){
403
perror("add_environment");
479
if(add_environment(getplugin(NULL), arg, true)){
480
errno = 0;
404
481
}
405
482
break;
406
483
case 'o': /* --options-for */
407
if(arg != NULL){
408
char *plugin_name = strsep(&arg, ":");
409
if(plugin_name[0] == '\0'){
410
break;
411
}
412
char *plugin_option;
413
while((plugin_option = strsep(&arg, ",")) != NULL){
414
if(not add_argument(getplugin(plugin_name), plugin_option)){
415
perror("add_argument");
416
return ARGP_ERR_UNKNOWN;
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;
417
502
}
418
503
}
504
errno = 0;
419
505
}
420
506
break;
421
507
case 'E': /* --env-for */
422
if(arg == NULL){
423
break;
424
}
425
508
{
426
509
char *envdef = strchr(arg, ':');
427
510
if(envdef == NULL){
511
argp_error(state, "No colon in \"%s\"", arg);
512
errno = EINVAL;
428
513
break;
429
514
}
430
515
*envdef = '\0';
431
if(not add_environment(getplugin(arg), envdef+1, true)){
432
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;
433
524
}
434
525
}
435
526
break;
436
527
case 'd': /* --disable */
437
if(arg != NULL){
528
{
438
529
plugin *p = getplugin(arg);
439
if(p == NULL){
440
return ARGP_ERR_UNKNOWN;
530
if(p != NULL){
531
p->disabled = true;
532
errno = 0;
441
533
}
442
p->disabled = true;
443
534
}
444
535
break;
445
536
case 'e': /* --enable */
446
if(arg != NULL){
537
{
447
538
plugin *p = getplugin(arg);
448
if(p == NULL){
449
return ARGP_ERR_UNKNOWN;
539
if(p != NULL){
540
p->disabled = false;
541
errno = 0;
450
542
}
451
p->disabled = false;
452
543
}
453
544
break;
454
545
case 128: /* --plugin-dir */
455
546
free(plugindir);
456
547
plugindir = strdup(arg);
457
if(plugindir == NULL){
458
perror("strdup");
459
}
548
if(plugindir != NULL){
549
errno = 0;
550
}
460
551
break;
461
552
case 129: /* --config-file */
462
553
/* This is already done by parse_opt_config_file() */
463
554
break;
464
555
case 130: /* --userid */
465
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
466
if(ret < 1 or tmpmax != (uid_t)tmpmax
467
or arg[numchars] != '\0'){
468
fprintf(stderr, "Bad user ID number: \"%s\", using %"
469
PRIdMAX "\n", arg, (intmax_t)uid);
470
} else {
471
uid = (uid_t)tmpmax;
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;
472
562
}
563
uid = (uid_t)tmp_id;
564
errno = 0;
473
565
break;
474
566
case 131: /* --groupid */
475
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
476
if(ret < 1 or tmpmax != (gid_t)tmpmax
477
or arg[numchars] != '\0'){
478
fprintf(stderr, "Bad group ID number: \"%s\", using %"
479
PRIdMAX "\n", arg, (intmax_t)gid);
480
} else {
481
gid = (gid_t)tmpmax;
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;
482
573
}
574
gid = (gid_t)tmp_id;
575
errno = 0;
483
576
break;
484
577
case 132: /* --debug */
485
578
debug = true;
486
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;
487
603
/*
488
604
* When adding more options before this line, remember to also add a
489
605
* "case" to the "parse_opt_config_file" function below.
492
608
/* Cryptsetup always passes an argument, which is an empty
493
609
string if "none" was specified in /etc/crypttab. So if
494
610
argument was empty, we ignore it silently. */
495
if(arg[0] != '\0'){
496
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
611
if(arg[0] == '\0'){
612
break;
497
613
}
498
break;
499
case ARGP_KEY_END:
500
break;
614
#if __GNUC__ >= 7
615
__attribute__((fallthrough));
616
#else
617
/* FALLTHROUGH */
618
#endif
501
619
default:
502
620
return ARGP_ERR_UNKNOWN;
503
621
}
504
return 0;
622
return errno; /* Set to 0 at start */
505
623
}
506
624
507
625
/* This option parser is the same as parse_opt() above, except it
509
627
error_t parse_opt_config_file(int key, char *arg,
510
628
__attribute__((unused))
511
629
struct argp_state *state){
630
errno = 0;
512
631
switch(key){
513
632
case 'g': /* --global-options */
514
633
case 'G': /* --global-env */
521
640
case 129: /* --config-file */
522
641
free(argfile);
523
642
argfile = strdup(arg);
524
if(argfile == NULL){
525
perror("strdup");
643
if(argfile != NULL){
644
errno = 0;
526
645
}
527
break;
646
break;
528
647
case 130: /* --userid */
529
648
case 131: /* --groupid */
530
649
case 132: /* --debug */
650
case 133: /* --plugin-helper-dir */
651
case '?': /* --help */
652
case -3: /* --usage */
653
case 'V': /* --version */
531
654
case ARGP_KEY_ARG:
532
case ARGP_KEY_END:
533
655
break;
534
656
default:
535
657
return ARGP_ERR_UNKNOWN;
536
658
}
537
return 0;
659
return errno;
538
660
}
539
661
540
662
struct argp argp = { .options = options,
544
666
545
667
/* Parse using parse_opt_config_file() in order to get the custom
546
668
config file location, if any. */
547
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
548
if(ret == ARGP_ERR_UNKNOWN){
549
fprintf(stderr, "Unknown error while parsing arguments\n");
550
exitstatus = EXIT_FAILURE;
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;
551
683
goto fallback;
552
684
}
553
685
559
691
conffp = fopen(AFILE, "r");
560
692
} else {
561
693
conffp = fopen(argfile, "r");
562
}
694
}
563
695
if(conffp != NULL){
564
696
char *org_line = NULL;
565
697
char *p, *arg, *new_arg, *line;
566
698
size_t size = 0;
567
699
const char whitespace_delims[] = " \r\t\f\v\n";
568
700
const char comment_delim[] = "#";
569
701
570
702
custom_argc = 1;
571
703
custom_argv = malloc(sizeof(char*) * 2);
572
704
if(custom_argv == NULL){
573
perror("malloc");
574
exitstatus = EXIT_FAILURE;
705
error(0, errno, "malloc");
706
exitstatus = EX_OSERR;
575
707
goto fallback;
576
708
}
577
709
custom_argv[0] = argv[0];
578
710
custom_argv[1] = NULL;
579
711
580
712
/* for each line in the config file, strip whitespace and ignore
581
713
commented text */
582
714
while(true){
584
716
if(sret == -1){
585
717
break;
586
718
}
587
719
588
720
line = org_line;
589
721
arg = strsep(&line, comment_delim);
590
722
while((p = strsep(&arg, whitespace_delims)) != NULL){
593
725
}
594
726
new_arg = strdup(p);
595
727
if(new_arg == NULL){
596
perror("strdup");
597
exitstatus = EXIT_FAILURE;
728
error(0, errno, "strdup");
729
exitstatus = EX_OSERR;
598
730
free(org_line);
599
731
goto fallback;
600
732
}
601
733
602
734
custom_argc += 1;
603
custom_argv = realloc(custom_argv, sizeof(char *)
604
* ((unsigned int) custom_argc + 1));
605
if(custom_argv == NULL){
606
perror("realloc");
607
exitstatus = EXIT_FAILURE;
608
free(org_line);
609
goto fallback;
735
{
736
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
737
char **new_argv = reallocarray(custom_argv,
738
(size_t)custom_argc + 1,
739
sizeof(char *));
740
#else
741
char **new_argv = NULL;
742
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
743
/* overflow */
744
errno = ENOMEM;
745
} else {
746
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
747
* sizeof(char *));
748
}
749
#endif
750
if(new_argv == NULL){
751
error(0, errno, "reallocarray");
752
exitstatus = EX_OSERR;
753
free(new_arg);
754
free(org_line);
755
goto fallback;
756
} else {
757
custom_argv = new_argv;
758
}
610
759
}
611
760
custom_argv[custom_argc-1] = new_arg;
612
custom_argv[custom_argc] = NULL;
761
custom_argv[custom_argc] = NULL;
613
762
}
614
763
}
764
do {
765
ret = fclose(conffp);
766
} while(ret == EOF and errno == EINTR);
767
if(ret == EOF){
768
error(0, errno, "fclose");
769
exitstatus = EX_IOERR;
770
goto fallback;
771
}
615
772
free(org_line);
616
773
} else {
617
774
/* Check for harmful errors and go to fallback. Other errors might
618
775
not affect opening plugins */
619
776
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
620
perror("fopen");
621
exitstatus = EXIT_FAILURE;
777
error(0, errno, "fopen");
778
exitstatus = EX_OSERR;
622
779
goto fallback;
623
780
}
624
781
}
625
/* If there was any arguments from configuration file,
626
pass them to parser as command arguments */
782
/* If there were any arguments from the configuration file, pass
783
them to parser as command line arguments */
627
784
if(custom_argv != NULL){
628
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
629
0, NULL);
630
if(ret == ARGP_ERR_UNKNOWN){
631
fprintf(stderr, "Unknown error while parsing arguments\n");
632
exitstatus = EXIT_FAILURE;
785
ret = argp_parse(&argp, custom_argc, custom_argv,
786
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
787
NULL, NULL);
788
switch(ret){
789
case 0:
790
break;
791
case ENOMEM:
792
default:
793
errno = ret;
794
error(0, errno, "argp_parse");
795
exitstatus = EX_OSERR;
796
goto fallback;
797
case EINVAL:
798
exitstatus = EX_CONFIG;
633
799
goto fallback;
634
800
}
635
801
}
636
802
637
803
/* Parse actual command line arguments, to let them override the
638
804
config file */
639
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
640
if(ret == ARGP_ERR_UNKNOWN){
641
fprintf(stderr, "Unknown error while parsing arguments\n");
642
exitstatus = EXIT_FAILURE;
643
goto fallback;
805
ret = argp_parse(&argp, argc, argv,
806
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
807
NULL, NULL);
808
switch(ret){
809
case 0:
810
break;
811
case ENOMEM:
812
default:
813
errno = ret;
814
error(0, errno, "argp_parse");
815
exitstatus = EX_OSERR;
816
goto fallback;
817
case EINVAL:
818
exitstatus = EX_USAGE;
819
goto fallback;
820
}
821
822
{
823
char *pluginhelperenv;
824
bool bret = true;
825
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
826
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
827
if(ret != -1){
828
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
829
}
830
if(ret == -1 or not bret){
831
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
832
" environment variable to \"%s\" for all plugins\n",
833
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
834
}
835
if(ret != -1){
836
free(pluginhelperenv);
837
}
644
838
}
645
839
646
840
if(debug){
647
for(plugin *p = plugin_list; p != NULL; p=p->next){
841
for(plugin *p = plugin_list; p != NULL; p = p->next){
648
842
fprintf(stderr, "Plugin: %s has %d arguments\n",
649
843
p->name ? p->name : "Global", p->argc - 1);
650
844
for(char **a = p->argv; *a != NULL; a++){
657
851
}
658
852
}
659
853
660
/* Strip permissions down to nobody */
661
setgid(gid);
854
if(getuid() == 0){
855
/* Work around Debian bug #633582:
856
<https://bugs.debian.org/633582> */
857
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
858
if(plugindir_fd == -1){
859
if(errno != ENOENT){
860
error(0, errno, "open(\"" PDIR "\")");
861
}
862
} else {
863
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
864
if(ret == -1){
865
error(0, errno, "fstat");
866
} else {
867
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
868
ret = fchown(plugindir_fd, uid, gid);
869
if(ret == -1){
870
error(0, errno, "fchown");
871
}
872
}
873
}
874
close(plugindir_fd);
875
}
876
877
/* Work around Debian bug #981302
878
<https://bugs.debian.org/981302> */
879
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
880
ret = symlink("/proc/self/fd", "/dev/fd");
881
if(ret == -1){
882
error(0, errno, "Failed to create /dev/fd symlink");
883
}
884
}
885
}
886
887
/* Lower permissions */
888
ret = setgid(gid);
662
889
if(ret == -1){
663
perror("setgid");
890
error(0, errno, "setgid");
664
891
}
665
892
ret = setuid(uid);
666
893
if(ret == -1){
667
perror("setuid");
668
}
669
670
if(plugindir == NULL){
671
dir = opendir(PDIR);
672
} else {
673
dir = opendir(plugindir);
674
}
675
676
if(dir == NULL){
677
perror("Could not open plugin dir");
678
exitstatus = EXIT_FAILURE;
679
goto fallback;
680
}
681
682
/* Set the FD_CLOEXEC flag on the directory, if possible */
894
error(0, errno, "setuid");
895
}
896
897
/* Open plugin directory with close_on_exec flag */
683
898
{
684
int dir_fd = dirfd(dir);
685
if(dir_fd >= 0){
686
ret = set_cloexec_flag(dir_fd);
687
if(ret < 0){
688
perror("set_cloexec_flag");
689
exitstatus = EXIT_FAILURE;
690
goto fallback;
899
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
900
#ifdef O_CLOEXEC
901
O_CLOEXEC
902
#else /* not O_CLOEXEC */
903
0
904
#endif /* not O_CLOEXEC */
905
);
906
if(dir_fd == -1){
907
error(0, errno, "Could not open plugin dir");
908
exitstatus = EX_UNAVAILABLE;
909
goto fallback;
910
}
911
912
#ifndef O_CLOEXEC
913
/* Set the FD_CLOEXEC flag on the directory */
914
ret = set_cloexec_flag(dir_fd);
915
if(ret < 0){
916
error(0, errno, "set_cloexec_flag");
917
exitstatus = EX_OSERR;
918
goto fallback;
919
}
920
#endif /* O_CLOEXEC */
921
}
922
923
int good_name(const struct dirent * const dirent){
924
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
925
"*.dpkg-old", "*.dpkg-bak",
926
"*.dpkg-divert", NULL };
927
#ifdef __GNUC__
928
#pragma GCC diagnostic push
929
#pragma GCC diagnostic ignored "-Wcast-qual"
930
#endif
931
for(const char **pat = (const char **)patterns;
932
*pat != NULL; pat++){
933
#ifdef __GNUC__
934
#pragma GCC diagnostic pop
935
#endif
936
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
937
!= FNM_NOMATCH){
938
if(debug){
939
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
940
" matching pattern %s\n", dirent->d_name, *pat);
941
}
942
return 0;
691
943
}
692
944
}
945
return 1;
946
}
947
948
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
949
alphasort);
950
if(numplugins == -1){
951
error(0, errno, "Could not scan plugin dir");
952
direntries = NULL;
953
exitstatus = EX_OSERR;
954
goto fallback;
693
955
}
694
956
695
957
FD_ZERO(&rfds_all);
696
958
697
959
/* Read and execute any executable in the plugin directory*/
698
while(true){
699
dirst = readdir(dir);
700
701
/* All directory entries have been processed */
702
if(dirst == NULL){
703
if(errno == EBADF){
704
perror("readdir");
705
exitstatus = EXIT_FAILURE;
706
goto fallback;
707
}
708
break;
709
}
710
711
d_name_len = strlen(dirst->d_name);
712
713
/* Ignore dotfiles, backup files and other junk */
714
{
715
bool bad_name = false;
716
717
const char const *bad_prefixes[] = { ".", "#", NULL };
718
719
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
720
".dpkg-old",
721
".dpkg-bak",
722
".dpkg-divert", NULL };
723
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
724
size_t pre_len = strlen(*pre);
725
if((d_name_len >= pre_len)
726
and strncmp((dirst->d_name), *pre, pre_len) == 0){
727
if(debug){
728
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
729
" with bad prefix %s\n", dirst->d_name, *pre);
730
}
731
bad_name = true;
732
break;
733
}
734
}
735
if(bad_name){
736
continue;
737
}
738
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
739
size_t suf_len = strlen(*suf);
740
if((d_name_len >= suf_len)
741
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
742
== 0)){
743
if(debug){
744
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
745
" with bad suffix %s\n", dirst->d_name, *suf);
746
}
747
bad_name = true;
748
break;
749
}
750
}
751
752
if(bad_name){
753
continue;
754
}
755
}
756
757
char *filename;
758
if(plugindir == NULL){
759
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
760
} else {
761
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
762
}
763
if(ret < 0){
764
perror("asprintf");
960
for(int i = 0; i < numplugins; i++){
961
962
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
963
if(plugin_fd == -1){
964
error(0, errno, "Could not open plugin");
965
free(direntries[i]);
765
966
continue;
766
967
}
767
768
ret = stat(filename, &st);
968
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
769
969
if(ret == -1){
770
perror("stat");
771
free(filename);
970
error(0, errno, "stat");
971
close(plugin_fd);
972
free(direntries[i]);
772
973
continue;
773
974
}
774
975
775
976
/* Ignore non-executable files */
776
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
977
if(not S_ISREG(st.st_mode)
978
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
979
X_OK, 0)) != 0)){
777
980
if(debug){
778
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
779
" with bad type or mode\n", filename);
981
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
982
" with bad type or mode\n",
983
plugindir != NULL ? plugindir : PDIR,
984
direntries[i]->d_name);
780
985
}
781
free(filename);
986
close(plugin_fd);
987
free(direntries[i]);
782
988
continue;
783
989
}
784
990
785
plugin *p = getplugin(dirst->d_name);
991
plugin *p = getplugin(direntries[i]->d_name);
786
992
if(p == NULL){
787
perror("getplugin");
788
free(filename);
993
error(0, errno, "getplugin");
994
close(plugin_fd);
995
free(direntries[i]);
789
996
continue;
790
997
}
791
998
if(p->disabled){
792
999
if(debug){
793
1000
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
794
dirst->d_name);
1001
direntries[i]->d_name);
795
1002
}
796
free(filename);
1003
close(plugin_fd);
1004
free(direntries[i]);
797
1005
continue;
798
1006
}
799
1007
{
802
1010
if(g != NULL){
803
1011
for(char **a = g->argv + 1; *a != NULL; a++){
804
1012
if(not add_argument(p, *a)){
805
perror("add_argument");
1013
error(0, errno, "add_argument");
806
1014
}
807
1015
}
808
1016
/* Add global environment variables */
809
1017
for(char **e = g->environ; *e != NULL; e++){
810
1018
if(not add_environment(p, *e, false)){
811
perror("add_environment");
1019
error(0, errno, "add_environment");
812
1020
}
813
1021
}
814
1022
}
815
1023
}
816
/* If this plugin has any environment variables, we will call
817
using execve and need to duplicate the environment from this
818
process, too. */
1024
/* If this plugin has any environment variables, we need to
1025
duplicate the environment from this process, too. */
819
1026
if(p->environ[0] != NULL){
820
1027
for(char **e = environ; *e != NULL; e++){
821
1028
if(not add_environment(p, *e, false)){
822
perror("add_environment");
1029
error(0, errno, "add_environment");
823
1030
}
824
1031
}
825
1032
}
826
1033
827
1034
int pipefd[2];
828
ret = pipe(pipefd);
1035
#ifndef O_CLOEXEC
1036
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1037
#else /* O_CLOEXEC */
1038
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1039
#endif /* O_CLOEXEC */
829
1040
if(ret == -1){
830
perror("pipe");
831
exitstatus = EXIT_FAILURE;
832
goto fallback;
833
}
1041
error(0, errno, "pipe");
1042
exitstatus = EX_OSERR;
1043
free(direntries[i]);
1044
goto fallback;
1045
}
1046
if(pipefd[0] >= FD_SETSIZE){
1047
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1048
FD_SETSIZE);
1049
close(pipefd[0]);
1050
close(pipefd[1]);
1051
exitstatus = EX_OSERR;
1052
free(direntries[i]);
1053
goto fallback;
1054
}
1055
#ifndef O_CLOEXEC
834
1056
/* Ask OS to automatic close the pipe on exec */
835
1057
ret = set_cloexec_flag(pipefd[0]);
836
1058
if(ret < 0){
837
perror("set_cloexec_flag");
838
exitstatus = EXIT_FAILURE;
1059
error(0, errno, "set_cloexec_flag");
1060
close(pipefd[0]);
1061
close(pipefd[1]);
1062
exitstatus = EX_OSERR;
1063
free(direntries[i]);
839
1064
goto fallback;
840
1065
}
841
1066
ret = set_cloexec_flag(pipefd[1]);
842
1067
if(ret < 0){
843
perror("set_cloexec_flag");
844
exitstatus = EXIT_FAILURE;
1068
error(0, errno, "set_cloexec_flag");
1069
close(pipefd[0]);
1070
close(pipefd[1]);
1071
exitstatus = EX_OSERR;
1072
free(direntries[i]);
845
1073
goto fallback;
846
1074
}
1075
#endif /* not O_CLOEXEC */
847
1076
/* Block SIGCHLD until process is safely in process list */
848
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1077
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1078
&sigchld_action.sa_mask,
1079
NULL));
849
1080
if(ret < 0){
850
perror("sigprocmask");
851
exitstatus = EXIT_FAILURE;
1081
error(0, errno, "sigprocmask");
1082
exitstatus = EX_OSERR;
1083
free(direntries[i]);
852
1084
goto fallback;
853
1085
}
854
1086
/* Starting a new process to be watched */
855
pid_t pid = fork();
1087
pid_t pid;
1088
do {
1089
pid = fork();
1090
} while(pid == -1 and errno == EINTR);
856
1091
if(pid == -1){
857
perror("fork");
858
exitstatus = EXIT_FAILURE;
1092
error(0, errno, "fork");
1093
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1094
&sigchld_action.sa_mask, NULL));
1095
close(pipefd[0]);
1096
close(pipefd[1]);
1097
exitstatus = EX_OSERR;
1098
free(direntries[i]);
859
1099
goto fallback;
860
1100
}
861
1101
if(pid == 0){
862
1102
/* this is the child process */
863
1103
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
864
1104
if(ret < 0){
865
perror("sigaction");
866
_exit(EXIT_FAILURE);
1105
error(0, errno, "sigaction");
1106
_exit(EX_OSERR);
867
1107
}
868
1108
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
869
1109
if(ret < 0){
870
perror("sigprocmask");
871
_exit(EXIT_FAILURE);
1110
error(0, errno, "sigprocmask");
1111
_exit(EX_OSERR);
872
1112
}
873
1113
874
1114
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
875
1115
if(ret == -1){
876
perror("dup2");
877
_exit(EXIT_FAILURE);
1116
error(0, errno, "dup2");
1117
_exit(EX_OSERR);
878
1118
}
879
1119
880
if(dirfd(dir) < 0){
881
/* If dir has no file descriptor, we could not set FD_CLOEXEC
882
above and must now close it manually here. */
883
closedir(dir);
884
}
885
if(p->environ[0] == NULL){
886
if(execv(filename, p->argv) < 0){
887
perror("execv");
888
_exit(EXIT_FAILURE);
889
}
890
} else {
891
if(execve(filename, p->argv, p->environ) < 0){
892
perror("execve");
893
_exit(EXIT_FAILURE);
894
}
1120
if(fexecve(plugin_fd, p->argv,
1121
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1122
error(0, errno, "fexecve for %s/%s",
1123
plugindir != NULL ? plugindir : PDIR,
1124
direntries[i]->d_name);
1125
_exit(EX_OSERR);
895
1126
}
896
1127
/* no return */
897
1128
}
898
1129
/* Parent process */
899
1130
close(pipefd[1]); /* Close unused write end of pipe */
900
free(filename);
901
plugin *new_plugin = getplugin(dirst->d_name);
1131
close(plugin_fd);
1132
plugin *new_plugin = getplugin(direntries[i]->d_name);
902
1133
if(new_plugin == NULL){
903
perror("getplugin");
904
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1134
error(0, errno, "getplugin");
1135
ret = (int)(TEMP_FAILURE_RETRY
1136
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1137
NULL)));
905
1138
if(ret < 0){
906
perror("sigprocmask");
1139
error(0, errno, "sigprocmask");
907
1140
}
908
exitstatus = EXIT_FAILURE;
1141
exitstatus = EX_OSERR;
1142
free(direntries[i]);
909
1143
goto fallback;
910
1144
}
1145
free(direntries[i]);
911
1146
912
1147
new_plugin->pid = pid;
913
1148
new_plugin->fd = pipefd[0];
914
1149
1150
if(debug){
1151
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1152
new_plugin->name, (intmax_t) (new_plugin->pid));
1153
}
1154
915
1155
/* Unblock SIGCHLD so signal handler can be run if this process
916
1156
has already completed */
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1157
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1158
&sigchld_action.sa_mask,
1159
NULL));
918
1160
if(ret < 0){
919
perror("sigprocmask");
920
exitstatus = EXIT_FAILURE;
1161
error(0, errno, "sigprocmask");
1162
exitstatus = EX_OSERR;
921
1163
goto fallback;
922
1164
}
923
1165
928
1170
}
929
1171
}
930
1172
931
closedir(dir);
932
dir = NULL;
1173
free(direntries);
1174
direntries = NULL;
1175
close(dir_fd);
1176
dir_fd = -1;
933
1177
free_plugin(getplugin(NULL));
934
1178
935
1179
for(plugin *p = plugin_list; p != NULL; p = p->next){
947
1191
while(plugin_list){
948
1192
fd_set rfds = rfds_all;
949
1193
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
950
if(select_ret == -1){
951
perror("select");
952
exitstatus = EXIT_FAILURE;
1194
if(select_ret == -1 and errno != EINTR){
1195
error(0, errno, "select");
1196
exitstatus = EX_OSERR;
953
1197
goto fallback;
954
1198
}
955
1199
/* OK, now either a process completed, or something can be read
961
1205
if(not WIFEXITED(proc->status)
962
1206
or WEXITSTATUS(proc->status) != 0){
963
1207
/* Bad exit by plugin */
964
1208
965
1209
if(debug){
966
1210
if(WIFEXITED(proc->status)){
967
1211
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
970
1214
WEXITSTATUS(proc->status));
971
1215
} else if(WIFSIGNALED(proc->status)){
972
1216
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
973
" signal %d\n", proc->name,
1217
" signal %d: %s\n", proc->name,
974
1218
(intmax_t) (proc->pid),
975
WTERMSIG(proc->status));
976
} else if(WCOREDUMP(proc->status)){
977
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
978
" core\n", proc->name, (intmax_t) (proc->pid));
1219
WTERMSIG(proc->status),
1220
strsignal(WTERMSIG(proc->status)));
979
1221
}
980
1222
}
981
1223
982
1224
/* Remove the plugin */
983
1225
FD_CLR(proc->fd, &rfds_all);
984
1226
985
1227
/* Block signal while modifying process_list */
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1228
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1229
(SIG_BLOCK,
1230
&sigchld_action.sa_mask,
1231
NULL));
987
1232
if(ret < 0){
988
perror("sigprocmask");
989
exitstatus = EXIT_FAILURE;
1233
error(0, errno, "sigprocmask");
1234
exitstatus = EX_OSERR;
990
1235
goto fallback;
991
1236
}
992
1237
995
1240
proc = next_plugin;
996
1241
997
1242
/* We are done modifying process list, so unblock signal */
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
1243
ret = (int)(TEMP_FAILURE_RETRY
1244
(sigprocmask(SIG_UNBLOCK,
1245
&sigchld_action.sa_mask, NULL)));
1000
1246
if(ret < 0){
1001
perror("sigprocmask");
1002
exitstatus = EXIT_FAILURE;
1247
error(0, errno, "sigprocmask");
1248
exitstatus = EX_OSERR;
1003
1249
goto fallback;
1004
1250
}
1005
1251
1015
1261
bool bret = print_out_password(proc->buffer,
1016
1262
proc->buffer_length);
1017
1263
if(not bret){
1018
perror("print_out_password");
1019
exitstatus = EXIT_FAILURE;
1264
error(0, errno, "print_out_password");
1265
exitstatus = EX_IOERR;
1020
1266
}
1021
1267
goto fallback;
1022
1268
}
1029
1275
}
1030
1276
/* Before reading, make the process' data buffer large enough */
1031
1277
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1032
proc->buffer = realloc(proc->buffer, proc->buffer_size
1033
+ (size_t) BUFFER_SIZE);
1034
if(proc->buffer == NULL){
1035
perror("malloc");
1036
exitstatus = EXIT_FAILURE;
1278
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1279
+ (size_t) BUFFER_SIZE);
1280
if(new_buffer == NULL){
1281
error(0, errno, "malloc");
1282
exitstatus = EX_OSERR;
1037
1283
goto fallback;
1038
1284
}
1285
proc->buffer = new_buffer;
1039
1286
proc->buffer_size += BUFFER_SIZE;
1040
1287
}
1041
1288
/* Read from the process */
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1289
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1290
proc->buffer
1291
+ proc->buffer_length,
1292
BUFFER_SIZE));
1044
1293
if(sret < 0){
1045
1294
/* Read error from this process; ignore the error */
1046
1295
proc = proc->next;
1054
1303
}
1055
1304
}
1056
1305
}
1057
1058
1306
1307
1059
1308
fallback:
1060
1309
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1310
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1311
and exitstatus != EX_OK)){
1062
1312
/* Fallback if all plugins failed, none are found or an error
1063
1313
occured */
1064
1314
bool bret;
1072
1322
}
1073
1323
bret = print_out_password(passwordbuffer, len);
1074
1324
if(not bret){
1075
perror("print_out_password");
1076
exitstatus = EXIT_FAILURE;
1325
error(0, errno, "print_out_password");
1326
exitstatus = EX_IOERR;
1077
1327
}
1078
1328
}
1079
1329
1080
1330
/* Restore old signal handler */
1081
1331
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1082
1332
if(ret == -1){
1083
perror("sigaction");
1084
exitstatus = EXIT_FAILURE;
1333
error(0, errno, "sigaction");
1334
exitstatus = EX_OSERR;
1085
1335
}
1086
1336
1087
1337
if(custom_argv != NULL){
1091
1341
free(custom_argv);
1092
1342
}
1093
1343
1094
if(dir != NULL){
1095
closedir(dir);
1344
free(direntries);
1345
1346
if(dir_fd != -1){
1347
close(dir_fd);
1096
1348
}
1097
1349
1098
1350
/* Kill the processes */
1102
1354
ret = kill(p->pid, SIGTERM);
1103
1355
if(ret == -1 and errno != ESRCH){
1104
1356
/* Set-uid proccesses might not get closed */
1105
perror("kill");
1357
error(0, errno, "kill");
1106
1358
}
1107
1359
}
1108
1360
}
1109
1361
1110
1362
/* Wait for any remaining child processes to terminate */
1111
do{
1363
do {
1112
1364
ret = wait(NULL);
1113
1365
} while(ret >= 0);
1114
1366
if(errno != ECHILD){
1115
perror("wait");
1367
error(0, errno, "wait");
1116
1368
}
1117
1369
1118
1370
free_plugin_list();
1119
1371
1120
1372
free(plugindir);
1373
free(pluginhelperdir);
1121
1374
free(argfile);
1122
1375
1123
1376
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0