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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 renamed:
- mandos-list => mandos-ctl
- 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() */
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;
89
111
size_t buffer_size;
90
112
size_t buffer_length;
91
113
bool eof;
92
volatile bool completed;
93
volatile int status;
114
volatile sig_atomic_t completed;
115
int status;
94
116
struct plugin *next;
95
117
} plugin;
96
118
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;
147
free(new_plugin);
148
errno = e;
118
149
return NULL;
119
150
}
120
151
}
121
152
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
153
*new_plugin = (plugin){ .name = copy_name,
154
.argc = 1,
155
.disabled = false,
156
.next = plugin_list };
126
157
127
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);
128
161
if(new_plugin->argv == NULL){
162
int e = errno;
129
163
free(copy_name);
130
164
free(new_plugin);
165
errno = e;
131
166
return NULL;
132
167
}
133
168
new_plugin->argv[0] = copy_name;
134
169
new_plugin->argv[1] = NULL;
135
170
136
new_plugin->environ = malloc(sizeof(char *));
171
do {
172
new_plugin->environ = malloc(sizeof(char *));
173
} while(new_plugin->environ == NULL and errno == EINTR);
137
174
if(new_plugin->environ == NULL){
175
int e = errno;
138
176
free(copy_name);
139
177
free(new_plugin->argv);
140
178
free(new_plugin);
179
errno = e;
141
180
return NULL;
142
181
}
143
182
new_plugin->environ[0] = NULL;
148
187
}
149
188
150
189
/* Helper function for add_argument and add_environment */
190
__attribute__((nonnull, warn_unused_result))
151
191
static bool add_to_char_array(const char *new, char ***array,
152
192
int *len){
153
193
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (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);
156
210
/* Malloc check */
157
if(*array == NULL){
211
if(new_array == NULL){
158
212
return false;
159
213
}
214
*array = new_array;
160
215
/* Make a copy of the new string */
161
char *copy = strdup(new);
216
char *copy;
217
do {
218
copy = strdup(new);
219
} while(copy == NULL and errno == EINTR);
162
220
if(copy == NULL){
163
221
return false;
164
222
}
171
229
}
172
230
173
231
/* Add to a plugin's argument vector */
232
__attribute__((nonnull(2), warn_unused_result))
174
233
static bool add_argument(plugin *p, const char *arg){
175
234
if(p == NULL){
176
235
return false;
179
238
}
180
239
181
240
/* Add to a plugin's environment */
241
__attribute__((nonnull(2), warn_unused_result))
182
242
static bool add_environment(plugin *p, const char *def, bool replace){
183
243
if(p == NULL){
184
244
return false;
186
246
/* namelen = length of name of environment variable */
187
247
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
248
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
249
for(char **envdef = p->environ; *envdef != NULL; envdef++){
250
if(strncmp(*envdef, def, namelen + 1) == 0){
191
251
/* It already exists */
192
252
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
194
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){
195
258
return false;
196
259
}
197
*e = new;
198
strcpy(*e, def);
260
*envdef = new_envdef;
261
strcpy(*envdef, def);
199
262
}
200
263
return true;
201
264
}
203
266
return add_to_char_array(def, &(p->environ), &(p->envc));
204
267
}
205
268
269
#ifndef O_CLOEXEC
206
270
/*
207
271
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
272
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
273
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
274
*/
275
__attribute__((warn_unused_result))
211
276
static int set_cloexec_flag(int fd){
212
int ret = fcntl(fd, F_GETFD, 0);
277
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
213
278
/* If reading the flags failed, return error indication now. */
214
279
if(ret < 0){
215
280
return ret;
216
281
}
217
282
/* Store modified flag word in the descriptor. */
218
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
283
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
284
ret | FD_CLOEXEC));
219
285
}
286
#endif /* not O_CLOEXEC */
220
287
221
288
222
289
/* Mark processes as completed when they exit, and save their exit
223
290
status. */
224
291
static void handle_sigchld(__attribute__((unused)) int sig){
292
int old_errno = errno;
225
293
while(true){
226
294
plugin *proc = plugin_list;
227
295
int status;
231
299
break;
232
300
}
233
301
if(pid == -1){
234
if(errno != ECHILD){
235
perror("waitpid");
302
if(errno == ECHILD){
303
/* No child processes */
304
break;
236
305
}
237
/* No child processes */
238
break;
306
error(0, errno, "waitpid");
239
307
}
240
308
241
309
/* A child exited, find it in process_list */
247
315
continue;
248
316
}
249
317
proc->status = status;
250
proc->completed = true;
318
proc->completed = 1;
251
319
}
320
errno = old_errno;
252
321
}
253
322
254
323
/* Prints out a password to stdout */
324
__attribute__((nonnull, warn_unused_result))
255
325
static bool print_out_password(const char *buffer, size_t length){
256
326
ssize_t ret;
257
327
for(size_t written = 0; written < length; written += (size_t)ret){
265
335
}
266
336
267
337
/* Removes and free a plugin from the plugin list */
338
__attribute__((nonnull))
268
339
static void free_plugin(plugin *plugin_node){
269
340
270
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
341
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
271
342
free(*arg);
272
343
}
344
free(plugin_node->name);
273
345
free(plugin_node->argv);
274
346
for(char **env = plugin_node->environ; *env != NULL; env++){
275
347
free(*env);
276
348
}
277
349
free(plugin_node->environ);
278
350
free(plugin_node->buffer);
279
351
280
352
/* Removes the plugin from the singly-linked list */
281
353
if(plugin_node == plugin_list){
282
354
/* First one - simple */
302
374
303
375
int main(int argc, char *argv[]){
304
376
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
305
378
char *argfile = NULL;
306
379
FILE *conffp;
307
size_t d_name_len;
308
DIR *dir = NULL;
309
struct dirent *dirst;
380
struct dirent **direntries = NULL;
310
381
struct stat st;
311
382
fd_set rfds_all;
312
int ret, numchars, maxfd = 0;
383
int ret, maxfd = 0;
313
384
ssize_t sret;
314
intmax_t tmpmax;
315
385
uid_t uid = 65534;
316
386
gid_t gid = 65534;
317
387
bool debug = false;
321
391
.sa_flags = SA_NOCLDSTOP };
322
392
char **custom_argv = NULL;
323
393
int custom_argc = 0;
394
int dir_fd = -1;
324
395
325
396
/* Establish a signal handler */
326
397
sigemptyset(&sigchld_action.sa_mask);
327
398
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
328
399
if(ret == -1){
329
perror("sigaddset");
330
exitstatus = EXIT_FAILURE;
400
error(0, errno, "sigaddset");
401
exitstatus = EX_OSERR;
331
402
goto fallback;
332
403
}
333
404
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
334
405
if(ret == -1){
335
perror("sigaction");
336
exitstatus = EXIT_FAILURE;
406
error(0, errno, "sigaction");
407
exitstatus = EX_OSERR;
337
408
goto fallback;
338
409
}
339
410
371
442
.doc = "Group ID the plugins will run as", .group = 3 },
372
443
{ .name = "debug", .key = 132,
373
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 },
374
458
{ .name = NULL }
375
459
};
376
460
377
error_t parse_opt(int key, char *arg, __attribute__((unused))
378
struct argp_state *state) {
379
switch(key) {
461
__attribute__((nonnull(3)))
462
error_t parse_opt(int key, char *arg, struct argp_state *state){
463
errno = 0;
464
switch(key){
465
char *tmp;
466
intmax_t tmp_id;
380
467
case 'g': /* --global-options */
381
if(arg != NULL){
382
char *p;
383
while((p = strsep(&arg, ",")) != NULL){
384
if(p[0] == '\0'){
385
continue;
386
}
387
if(not add_argument(getplugin(NULL), p)){
388
perror("add_argument");
389
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;
390
473
}
391
474
}
475
errno = 0;
392
476
}
393
477
break;
394
478
case 'G': /* --global-env */
395
if(arg == NULL){
396
break;
397
}
398
if(not add_environment(getplugin(NULL), arg, true)){
399
perror("add_environment");
479
if(add_environment(getplugin(NULL), arg, true)){
480
errno = 0;
400
481
}
401
482
break;
402
483
case 'o': /* --options-for */
403
if(arg != NULL){
404
char *p_name = strsep(&arg, ":");
405
if(p_name[0] == '\0' or arg == NULL){
406
break;
407
}
408
char *opt = strsep(&arg, ":");
409
if(opt[0] == '\0' or opt == NULL){
410
break;
411
}
412
char *p;
413
while((p = strsep(&opt, ",")) != NULL){
414
if(p[0] == '\0'){
415
continue;
416
}
417
if(not add_argument(getplugin(p_name), p)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
420
}
421
}
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;
422
505
}
423
506
break;
424
507
case 'E': /* --env-for */
425
if(arg == NULL){
426
break;
427
}
428
508
{
429
509
char *envdef = strchr(arg, ':');
430
510
if(envdef == NULL){
511
argp_error(state, "No colon in \"%s\"", arg);
512
errno = EINVAL;
431
513
break;
432
514
}
433
515
*envdef = '\0';
434
if(not add_environment(getplugin(arg), envdef+1, true)){
435
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;
436
524
}
437
525
}
438
526
break;
439
527
case 'd': /* --disable */
440
if(arg != NULL){
528
{
441
529
plugin *p = getplugin(arg);
442
if(p == NULL){
443
return ARGP_ERR_UNKNOWN;
530
if(p != NULL){
531
p->disabled = true;
532
errno = 0;
444
533
}
445
p->disabled = true;
446
534
}
447
535
break;
448
536
case 'e': /* --enable */
449
if(arg != NULL){
537
{
450
538
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
539
if(p != NULL){
540
p->disabled = false;
541
errno = 0;
453
542
}
454
p->disabled = false;
455
543
}
456
544
break;
457
545
case 128: /* --plugin-dir */
458
546
free(plugindir);
459
547
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
462
}
548
if(plugindir != NULL){
549
errno = 0;
550
}
463
551
break;
464
552
case 129: /* --config-file */
465
553
/* This is already done by parse_opt_config_file() */
466
554
break;
467
555
case 130: /* --userid */
468
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
469
if(ret < 1 or tmpmax != (uid_t)tmpmax
470
or arg[numchars] != '\0'){
471
fprintf(stderr, "Bad user ID number: \"%s\", using %"
472
PRIdMAX "\n", arg, (intmax_t)uid);
473
} else {
474
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;
475
562
}
563
uid = (uid_t)tmp_id;
564
errno = 0;
476
565
break;
477
566
case 131: /* --groupid */
478
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
479
if(ret < 1 or tmpmax != (gid_t)tmpmax
480
or arg[numchars] != '\0'){
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
483
} else {
484
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;
485
573
}
574
gid = (gid_t)tmp_id;
575
errno = 0;
486
576
break;
487
577
case 132: /* --debug */
488
578
debug = true;
489
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;
490
603
/*
491
604
* When adding more options before this line, remember to also add a
492
605
* "case" to the "parse_opt_config_file" function below.
495
608
/* Cryptsetup always passes an argument, which is an empty
496
609
string if "none" was specified in /etc/crypttab. So if
497
610
argument was empty, we ignore it silently. */
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
611
if(arg[0] == '\0'){
612
break;
500
613
}
501
break;
502
case ARGP_KEY_END:
503
break;
614
#if __GNUC__ >= 7
615
__attribute__((fallthrough));
616
#else
617
/* FALLTHROUGH */
618
#endif
504
619
default:
505
620
return ARGP_ERR_UNKNOWN;
506
621
}
507
return 0;
622
return errno; /* Set to 0 at start */
508
623
}
509
624
510
625
/* This option parser is the same as parse_opt() above, except it
511
626
ignores everything but the --config-file option. */
512
627
error_t parse_opt_config_file(int key, char *arg,
513
628
__attribute__((unused))
514
struct argp_state *state) {
515
switch(key) {
629
struct argp_state *state){
630
errno = 0;
631
switch(key){
516
632
case 'g': /* --global-options */
517
633
case 'G': /* --global-env */
518
634
case 'o': /* --options-for */
524
640
case 129: /* --config-file */
525
641
free(argfile);
526
642
argfile = strdup(arg);
527
if(argfile == NULL){
528
perror("strdup");
643
if(argfile != NULL){
644
errno = 0;
529
645
}
530
break;
646
break;
531
647
case 130: /* --userid */
532
648
case 131: /* --groupid */
533
649
case 132: /* --debug */
650
case 133: /* --plugin-helper-dir */
651
case '?': /* --help */
652
case -3: /* --usage */
653
case 'V': /* --version */
534
654
case ARGP_KEY_ARG:
535
case ARGP_KEY_END:
536
655
break;
537
656
default:
538
657
return ARGP_ERR_UNKNOWN;
539
658
}
540
return 0;
659
return errno;
541
660
}
542
661
543
662
struct argp argp = { .options = options,
547
666
548
667
/* Parse using parse_opt_config_file() in order to get the custom
549
668
config file location, if any. */
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
552
fprintf(stderr, "Unknown error while parsing arguments\n");
553
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;
554
683
goto fallback;
555
684
}
556
685
562
691
conffp = fopen(AFILE, "r");
563
692
} else {
564
693
conffp = fopen(argfile, "r");
565
}
694
}
566
695
if(conffp != NULL){
567
696
char *org_line = NULL;
568
697
char *p, *arg, *new_arg, *line;
569
698
size_t size = 0;
570
699
const char whitespace_delims[] = " \r\t\f\v\n";
571
700
const char comment_delim[] = "#";
572
701
573
702
custom_argc = 1;
574
703
custom_argv = malloc(sizeof(char*) * 2);
575
704
if(custom_argv == NULL){
576
perror("malloc");
577
exitstatus = EXIT_FAILURE;
705
error(0, errno, "malloc");
706
exitstatus = EX_OSERR;
578
707
goto fallback;
579
708
}
580
709
custom_argv[0] = argv[0];
581
710
custom_argv[1] = NULL;
582
711
583
712
/* for each line in the config file, strip whitespace and ignore
584
713
commented text */
585
714
while(true){
587
716
if(sret == -1){
588
717
break;
589
718
}
590
719
591
720
line = org_line;
592
721
arg = strsep(&line, comment_delim);
593
722
while((p = strsep(&arg, whitespace_delims)) != NULL){
596
725
}
597
726
new_arg = strdup(p);
598
727
if(new_arg == NULL){
599
perror("strdup");
600
exitstatus = EXIT_FAILURE;
728
error(0, errno, "strdup");
729
exitstatus = EX_OSERR;
601
730
free(org_line);
602
731
goto fallback;
603
732
}
604
733
605
734
custom_argc += 1;
606
custom_argv = realloc(custom_argv, sizeof(char *)
607
* ((unsigned int) custom_argc + 1));
608
if(custom_argv == NULL){
609
perror("realloc");
610
exitstatus = EXIT_FAILURE;
611
free(org_line);
612
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
}
613
759
}
614
760
custom_argv[custom_argc-1] = new_arg;
615
custom_argv[custom_argc] = NULL;
761
custom_argv[custom_argc] = NULL;
616
762
}
617
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
}
618
772
free(org_line);
619
773
} else {
620
774
/* Check for harmful errors and go to fallback. Other errors might
621
775
not affect opening plugins */
622
776
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
perror("fopen");
624
exitstatus = EXIT_FAILURE;
777
error(0, errno, "fopen");
778
exitstatus = EX_OSERR;
625
779
goto fallback;
626
780
}
627
781
}
628
/* If there was any arguments from configuration file,
629
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 */
630
784
if(custom_argv != NULL){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
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;
636
799
goto fallback;
637
800
}
638
801
}
639
802
640
803
/* Parse actual command line arguments, to let them override the
641
804
config file */
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
646
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
}
647
838
}
648
839
649
840
if(debug){
650
for(plugin *p = plugin_list; p != NULL; p=p->next){
841
for(plugin *p = plugin_list; p != NULL; p = p->next){
651
842
fprintf(stderr, "Plugin: %s has %d arguments\n",
652
843
p->name ? p->name : "Global", p->argc - 1);
653
844
for(char **a = p->argv; *a != NULL; a++){
660
851
}
661
852
}
662
853
663
/* Strip permissions down to nobody */
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);
889
if(ret == -1){
890
error(0, errno, "setgid");
891
}
664
892
ret = setuid(uid);
665
893
if(ret == -1){
666
perror("setuid");
667
}
668
setgid(gid);
669
if(ret == -1){
670
perror("setgid");
671
}
672
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
677
}
678
679
if(dir == NULL){
680
perror("Could not open plugin dir");
681
exitstatus = EXIT_FAILURE;
682
goto fallback;
683
}
684
685
/* 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 */
686
898
{
687
int dir_fd = dirfd(dir);
688
if(dir_fd >= 0){
689
ret = set_cloexec_flag(dir_fd);
690
if(ret < 0){
691
perror("set_cloexec_flag");
692
exitstatus = EXIT_FAILURE;
693
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;
694
943
}
695
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;
696
955
}
697
956
698
957
FD_ZERO(&rfds_all);
699
958
700
959
/* Read and execute any executable in the plugin directory*/
701
while(true){
702
dirst = readdir(dir);
703
704
/* All directory entries have been processed */
705
if(dirst == NULL){
706
if(errno == EBADF){
707
perror("readdir");
708
exitstatus = EXIT_FAILURE;
709
goto fallback;
710
}
711
break;
712
}
713
714
d_name_len = strlen(dirst->d_name);
715
716
/* Ignore dotfiles, backup files and other junk */
717
{
718
bool bad_name = false;
719
720
const char const *bad_prefixes[] = { ".", "#", NULL };
721
722
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
723
".dpkg-old",
724
".dpkg-bak",
725
".dpkg-divert", NULL };
726
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
727
size_t pre_len = strlen(*pre);
728
if((d_name_len >= pre_len)
729
and strncmp((dirst->d_name), *pre, pre_len) == 0){
730
if(debug){
731
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
732
" with bad prefix %s\n", dirst->d_name, *pre);
733
}
734
bad_name = true;
735
break;
736
}
737
}
738
if(bad_name){
739
continue;
740
}
741
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
742
size_t suf_len = strlen(*suf);
743
if((d_name_len >= suf_len)
744
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
745
== 0)){
746
if(debug){
747
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
748
" with bad suffix %s\n", dirst->d_name, *suf);
749
}
750
bad_name = true;
751
break;
752
}
753
}
754
755
if(bad_name){
756
continue;
757
}
758
}
759
760
char *filename;
761
if(plugindir == NULL){
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
763
} else {
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
765
}
766
if(ret < 0){
767
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]);
768
966
continue;
769
967
}
770
771
ret = stat(filename, &st);
968
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
772
969
if(ret == -1){
773
perror("stat");
774
free(filename);
970
error(0, errno, "stat");
971
close(plugin_fd);
972
free(direntries[i]);
775
973
continue;
776
974
}
777
975
778
976
/* Ignore non-executable files */
779
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)){
780
980
if(debug){
781
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
782
" 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);
783
985
}
784
free(filename);
986
close(plugin_fd);
987
free(direntries[i]);
785
988
continue;
786
989
}
787
990
788
plugin *p = getplugin(dirst->d_name);
991
plugin *p = getplugin(direntries[i]->d_name);
789
992
if(p == NULL){
790
perror("getplugin");
791
free(filename);
993
error(0, errno, "getplugin");
994
close(plugin_fd);
995
free(direntries[i]);
792
996
continue;
793
997
}
794
998
if(p->disabled){
795
999
if(debug){
796
1000
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
797
dirst->d_name);
1001
direntries[i]->d_name);
798
1002
}
799
free(filename);
1003
close(plugin_fd);
1004
free(direntries[i]);
800
1005
continue;
801
1006
}
802
1007
{
805
1010
if(g != NULL){
806
1011
for(char **a = g->argv + 1; *a != NULL; a++){
807
1012
if(not add_argument(p, *a)){
808
perror("add_argument");
1013
error(0, errno, "add_argument");
809
1014
}
810
1015
}
811
1016
/* Add global environment variables */
812
1017
for(char **e = g->environ; *e != NULL; e++){
813
1018
if(not add_environment(p, *e, false)){
814
perror("add_environment");
1019
error(0, errno, "add_environment");
815
1020
}
816
1021
}
817
1022
}
818
1023
}
819
/* If this plugin has any environment variables, we will call
820
using execve and need to duplicate the environment from this
821
process, too. */
1024
/* If this plugin has any environment variables, we need to
1025
duplicate the environment from this process, too. */
822
1026
if(p->environ[0] != NULL){
823
1027
for(char **e = environ; *e != NULL; e++){
824
1028
if(not add_environment(p, *e, false)){
825
perror("add_environment");
1029
error(0, errno, "add_environment");
826
1030
}
827
1031
}
828
1032
}
829
1033
830
1034
int pipefd[2];
831
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 */
832
1040
if(ret == -1){
833
perror("pipe");
834
exitstatus = EXIT_FAILURE;
835
goto fallback;
836
}
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
837
1056
/* Ask OS to automatic close the pipe on exec */
838
1057
ret = set_cloexec_flag(pipefd[0]);
839
1058
if(ret < 0){
840
perror("set_cloexec_flag");
841
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]);
842
1064
goto fallback;
843
1065
}
844
1066
ret = set_cloexec_flag(pipefd[1]);
845
1067
if(ret < 0){
846
perror("set_cloexec_flag");
847
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]);
848
1073
goto fallback;
849
1074
}
1075
#endif /* not O_CLOEXEC */
850
1076
/* Block SIGCHLD until process is safely in process list */
851
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));
852
1080
if(ret < 0){
853
perror("sigprocmask");
854
exitstatus = EXIT_FAILURE;
1081
error(0, errno, "sigprocmask");
1082
exitstatus = EX_OSERR;
1083
free(direntries[i]);
855
1084
goto fallback;
856
1085
}
857
1086
/* Starting a new process to be watched */
858
pid_t pid = fork();
1087
pid_t pid;
1088
do {
1089
pid = fork();
1090
} while(pid == -1 and errno == EINTR);
859
1091
if(pid == -1){
860
perror("fork");
861
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]);
862
1099
goto fallback;
863
1100
}
864
1101
if(pid == 0){
865
1102
/* this is the child process */
866
1103
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
867
1104
if(ret < 0){
868
perror("sigaction");
869
_exit(EXIT_FAILURE);
1105
error(0, errno, "sigaction");
1106
_exit(EX_OSERR);
870
1107
}
871
1108
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
872
1109
if(ret < 0){
873
perror("sigprocmask");
874
_exit(EXIT_FAILURE);
1110
error(0, errno, "sigprocmask");
1111
_exit(EX_OSERR);
875
1112
}
876
1113
877
1114
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
878
1115
if(ret == -1){
879
perror("dup2");
880
_exit(EXIT_FAILURE);
1116
error(0, errno, "dup2");
1117
_exit(EX_OSERR);
881
1118
}
882
1119
883
if(dirfd(dir) < 0){
884
/* If dir has no file descriptor, we could not set FD_CLOEXEC
885
above and must now close it manually here. */
886
closedir(dir);
887
}
888
if(p->environ[0] == NULL){
889
if(execv(filename, p->argv) < 0){
890
perror("execv");
891
_exit(EXIT_FAILURE);
892
}
893
} else {
894
if(execve(filename, p->argv, p->environ) < 0){
895
perror("execve");
896
_exit(EXIT_FAILURE);
897
}
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);
898
1126
}
899
1127
/* no return */
900
1128
}
901
1129
/* Parent process */
902
1130
close(pipefd[1]); /* Close unused write end of pipe */
903
free(filename);
904
plugin *new_plugin = getplugin(dirst->d_name);
1131
close(plugin_fd);
1132
plugin *new_plugin = getplugin(direntries[i]->d_name);
905
1133
if(new_plugin == NULL){
906
perror("getplugin");
907
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)));
908
1138
if(ret < 0){
909
perror("sigprocmask");
1139
error(0, errno, "sigprocmask");
910
1140
}
911
exitstatus = EXIT_FAILURE;
1141
exitstatus = EX_OSERR;
1142
free(direntries[i]);
912
1143
goto fallback;
913
1144
}
1145
free(direntries[i]);
914
1146
915
1147
new_plugin->pid = pid;
916
1148
new_plugin->fd = pipefd[0];
917
1149
1150
if(debug){
1151
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1152
new_plugin->name, (intmax_t) (new_plugin->pid));
1153
}
1154
918
1155
/* Unblock SIGCHLD so signal handler can be run if this process
919
1156
has already completed */
920
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));
921
1160
if(ret < 0){
922
perror("sigprocmask");
923
exitstatus = EXIT_FAILURE;
1161
error(0, errno, "sigprocmask");
1162
exitstatus = EX_OSERR;
924
1163
goto fallback;
925
1164
}
926
1165
931
1170
}
932
1171
}
933
1172
934
closedir(dir);
935
dir = NULL;
1173
free(direntries);
1174
direntries = NULL;
1175
close(dir_fd);
1176
dir_fd = -1;
1177
free_plugin(getplugin(NULL));
936
1178
937
1179
for(plugin *p = plugin_list; p != NULL; p = p->next){
938
1180
if(p->pid != 0){
949
1191
while(plugin_list){
950
1192
fd_set rfds = rfds_all;
951
1193
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
952
if(select_ret == -1){
953
perror("select");
954
exitstatus = EXIT_FAILURE;
1194
if(select_ret == -1 and errno != EINTR){
1195
error(0, errno, "select");
1196
exitstatus = EX_OSERR;
955
1197
goto fallback;
956
1198
}
957
1199
/* OK, now either a process completed, or something can be read
958
1200
from one of them */
959
1201
for(plugin *proc = plugin_list; proc != NULL;){
960
1202
/* Is this process completely done? */
961
if(proc->eof and proc->completed){
1203
if(proc->completed and proc->eof){
962
1204
/* Only accept the plugin output if it exited cleanly */
963
1205
if(not WIFEXITED(proc->status)
964
1206
or WEXITSTATUS(proc->status) != 0){
965
1207
/* Bad exit by plugin */
966
1208
967
1209
if(debug){
968
1210
if(WIFEXITED(proc->status)){
969
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
970
" %d\n", (intmax_t) (proc->pid),
1211
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1212
" status %d\n", proc->name,
1213
(intmax_t) (proc->pid),
971
1214
WEXITSTATUS(proc->status));
972
} else if(WIFSIGNALED(proc->status)) {
973
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
974
" %d\n", (intmax_t) (proc->pid),
975
WTERMSIG(proc->status));
976
} else if(WCOREDUMP(proc->status)){
977
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
978
(intmax_t) (proc->pid));
1215
} else if(WIFSIGNALED(proc->status)){
1216
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1217
" signal %d: %s\n", proc->name,
1218
(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