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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() */
66
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
64
FD_CLOEXEC, open(), O_RDONLY,
65
O_CLOEXEC, openat() */
66
#include <sys/wait.h> /* waitpid(), WNOHANG, WIFEXITED(),
67
WEXITSTATUS(), WIFSIGNALED(),
68
WTERMSIG(), wait() */
69
#include <error.h> /* error() */
70
#include <stdio.h> /* FILE, fprintf(), fopen(),
71
getline(), fclose(), EOF,
72
asprintf(), stderr */
73
#include <dirent.h> /* struct dirent, scandirat(),
74
alphasort() */
75
#include <sys/stat.h> /* struct stat, fstat(), S_ISDIR(),
76
lstat(), S_ISREG() */
77
#include <sys/select.h> /* fd_set, FD_ZERO(), FD_SETSIZE,
78
FD_SET(), select(), FD_CLR(),
79
FD_ISSET() */
80
#include <signal.h> /* struct sigaction, SA_NOCLDSTOP,
81
sigemptyset(), sigaddset(),
82
SIGCHLD, sigprocmask(), SIG_BLOCK,
83
SIG_UNBLOCK, kill(), SIGTERM */
84
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
85
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
86
#include <inttypes.h> /* intmax_t, strtoimax(), PRIdMAX */
87
#include <fnmatch.h> /* fnmatch(), FNM_FILE_NAME,
88
FNM_PERIOD, FNM_NOMATCH */
68
89
69
90
#define BUFFER_SIZE 256
70
91
71
92
#define PDIR "/lib/mandos/plugins.d"
93
#define PHDIR "/lib/mandos/plugin-helpers"
72
94
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
95
74
96
const char *argp_program_version = "plugin-runner " VERSION;
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
97
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
98
77
99
typedef struct plugin{
78
100
char *name; /* can be NULL or any plugin name */
81
103
char **environ;
82
104
int envc;
83
105
bool disabled;
84
106
85
107
/* Variables used for running processes*/
86
108
pid_t pid;
87
109
int fd;
98
120
99
121
/* Gets an existing plugin based on name,
100
122
or if none is found, creates a new one */
123
__attribute__((warn_unused_result))
101
124
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
125
/* Check for existing plugin with that name */
103
126
for(plugin *p = plugin_list; p != NULL; p = p->next){
104
127
if((p->name == name)
105
128
or (p->name and name and (strcmp(p->name, name) == 0))){
107
130
}
108
131
}
109
132
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
133
plugin *new_plugin = NULL;
134
do {
135
new_plugin = malloc(sizeof(plugin));
136
} while(new_plugin == NULL and errno == EINTR);
111
137
if(new_plugin == NULL){
112
138
return NULL;
113
139
}
114
140
char *copy_name = NULL;
115
141
if(name != NULL){
116
copy_name = strdup(name);
142
do {
143
copy_name = strdup(name);
144
} while(copy_name == NULL and errno == EINTR);
117
145
if(copy_name == NULL){
146
int e = errno;
118
147
free(new_plugin);
148
errno = e;
119
149
return NULL;
120
150
}
121
151
}
125
155
.disabled = false,
126
156
.next = plugin_list };
127
157
128
new_plugin->argv = malloc(sizeof(char *) * 2);
158
do {
159
new_plugin->argv = malloc(sizeof(char *) * 2);
160
} while(new_plugin->argv == NULL and errno == EINTR);
129
161
if(new_plugin->argv == NULL){
162
int e = errno;
130
163
free(copy_name);
131
164
free(new_plugin);
165
errno = e;
132
166
return NULL;
133
167
}
134
168
new_plugin->argv[0] = copy_name;
135
169
new_plugin->argv[1] = NULL;
136
170
137
new_plugin->environ = malloc(sizeof(char *));
171
do {
172
new_plugin->environ = malloc(sizeof(char *));
173
} while(new_plugin->environ == NULL and errno == EINTR);
138
174
if(new_plugin->environ == NULL){
175
int e = errno;
139
176
free(copy_name);
140
177
free(new_plugin->argv);
141
178
free(new_plugin);
179
errno = e;
142
180
return NULL;
143
181
}
144
182
new_plugin->environ[0] = NULL;
149
187
}
150
188
151
189
/* Helper function for add_argument and add_environment */
190
__attribute__((nonnull, warn_unused_result))
152
191
static bool add_to_char_array(const char *new, char ***array,
153
192
int *len){
154
193
/* Resize the pointed-to array to hold one more pointer */
155
*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
194
char **new_array = NULL;
195
do {
196
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
197
new_array = reallocarray(*array, (size_t)((*len) + 2),
198
sizeof(char *));
199
#else
200
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
201
/* overflow */
202
new_array = NULL;
203
errno = ENOMEM;
204
} else {
205
new_array = realloc(*array, (size_t)((*len) + 2)
206
* sizeof(char *));
207
}
208
#endif
209
} while(new_array == NULL and errno == EINTR);
157
210
/* Malloc check */
158
if(*array == NULL){
211
if(new_array == NULL){
159
212
return false;
160
213
}
214
*array = new_array;
161
215
/* Make a copy of the new string */
162
char *copy = strdup(new);
216
char *copy;
217
do {
218
copy = strdup(new);
219
} while(copy == NULL and errno == EINTR);
163
220
if(copy == NULL){
164
221
return false;
165
222
}
172
229
}
173
230
174
231
/* Add to a plugin's argument vector */
232
__attribute__((nonnull(2), warn_unused_result))
175
233
static bool add_argument(plugin *p, const char *arg){
176
234
if(p == NULL){
177
235
return false;
180
238
}
181
239
182
240
/* Add to a plugin's environment */
241
__attribute__((nonnull(2), warn_unused_result))
183
242
static bool add_environment(plugin *p, const char *def, bool replace){
184
243
if(p == NULL){
185
244
return false;
187
246
/* namelen = length of name of environment variable */
188
247
size_t namelen = (size_t)(strchrnul(def, '=') - def);
189
248
/* Search for this environment variable */
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
249
for(char **envdef = p->environ; *envdef != NULL; envdef++){
250
if(strncmp(*envdef, def, namelen + 1) == 0){
192
251
/* It already exists */
193
252
if(replace){
194
char *new = realloc(*e, strlen(def) + 1);
195
if(new == NULL){
253
char *new_envdef;
254
do {
255
new_envdef = realloc(*envdef, strlen(def) + 1);
256
} while(new_envdef == NULL and errno == EINTR);
257
if(new_envdef == NULL){
196
258
return false;
197
259
}
198
*e = new;
199
strcpy(*e, def);
260
*envdef = new_envdef;
261
strcpy(*envdef, def);
200
262
}
201
263
return true;
202
264
}
204
266
return add_to_char_array(def, &(p->environ), &(p->envc));
205
267
}
206
268
269
#ifndef O_CLOEXEC
207
270
/*
208
271
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
272
* Descriptor Flags".
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
273
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
211
274
*/
275
__attribute__((warn_unused_result))
212
276
static int set_cloexec_flag(int fd){
213
int ret = fcntl(fd, F_GETFD, 0);
277
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
278
/* If reading the flags failed, return error indication now. */
215
279
if(ret < 0){
216
280
return ret;
217
281
}
218
282
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
283
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
284
ret | FD_CLOEXEC));
220
285
}
286
#endif /* not O_CLOEXEC */
221
287
222
288
223
289
/* Mark processes as completed when they exit, and save their exit
237
303
/* No child processes */
238
304
break;
239
305
}
240
perror("waitpid");
306
error(0, errno, "waitpid");
241
307
}
242
308
243
309
/* A child exited, find it in process_list */
255
321
}
256
322
257
323
/* Prints out a password to stdout */
324
__attribute__((nonnull, warn_unused_result))
258
325
static bool print_out_password(const char *buffer, size_t length){
259
326
ssize_t ret;
260
327
for(size_t written = 0; written < length; written += (size_t)ret){
268
335
}
269
336
270
337
/* Removes and free a plugin from the plugin list */
338
__attribute__((nonnull))
271
339
static void free_plugin(plugin *plugin_node){
272
340
273
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
341
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
274
342
free(*arg);
275
343
}
344
free(plugin_node->name);
276
345
free(plugin_node->argv);
277
346
for(char **env = plugin_node->environ; *env != NULL; env++){
278
347
free(*env);
279
348
}
280
349
free(plugin_node->environ);
281
350
free(plugin_node->buffer);
282
351
283
352
/* Removes the plugin from the singly-linked list */
284
353
if(plugin_node == plugin_list){
285
354
/* First one - simple */
305
374
306
375
int main(int argc, char *argv[]){
307
376
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
308
378
char *argfile = NULL;
309
379
FILE *conffp;
310
size_t d_name_len;
311
DIR *dir = NULL;
312
struct dirent *dirst;
380
struct dirent **direntries = NULL;
313
381
struct stat st;
314
382
fd_set rfds_all;
315
int ret, numchars, maxfd = 0;
383
int ret, maxfd = 0;
316
384
ssize_t sret;
317
intmax_t tmpmax;
318
385
uid_t uid = 65534;
319
386
gid_t gid = 65534;
320
387
bool debug = false;
324
391
.sa_flags = SA_NOCLDSTOP };
325
392
char **custom_argv = NULL;
326
393
int custom_argc = 0;
394
int dir_fd = -1;
327
395
328
396
/* Establish a signal handler */
329
397
sigemptyset(&sigchld_action.sa_mask);
330
398
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
331
399
if(ret == -1){
332
perror("sigaddset");
333
exitstatus = EXIT_FAILURE;
400
error(0, errno, "sigaddset");
401
exitstatus = EX_OSERR;
334
402
goto fallback;
335
403
}
336
404
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
337
405
if(ret == -1){
338
perror("sigaction");
339
exitstatus = EXIT_FAILURE;
406
error(0, errno, "sigaction");
407
exitstatus = EX_OSERR;
340
408
goto fallback;
341
409
}
342
410
374
442
.doc = "Group ID the plugins will run as", .group = 3 },
375
443
{ .name = "debug", .key = 132,
376
444
.doc = "Debug mode", .group = 4 },
445
{ .name = "plugin-helper-dir", .key = 133,
446
.arg = "DIRECTORY",
447
.doc = "Specify a different plugin helper directory",
448
.group = 2 },
449
/*
450
* These reproduce what we would get without ARGP_NO_HELP
451
*/
452
{ .name = "help", .key = '?',
453
.doc = "Give this help list", .group = -1 },
454
{ .name = "usage", .key = -3,
455
.doc = "Give a short usage message", .group = -1 },
456
{ .name = "version", .key = 'V',
457
.doc = "Print program version", .group = -1 },
377
458
{ .name = NULL }
378
459
};
379
460
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
461
__attribute__((nonnull(3)))
462
error_t parse_opt(int key, char *arg, struct argp_state *state){
463
errno = 0;
382
464
switch(key){
465
char *tmp;
466
intmax_t tmp_id;
383
467
case 'g': /* --global-options */
384
if(arg != NULL){
385
char *p;
386
while((p = strsep(&arg, ",")) != NULL){
387
if(p[0] == '\0'){
388
continue;
389
}
390
if(not add_argument(getplugin(NULL), p)){
391
perror("add_argument");
392
return ARGP_ERR_UNKNOWN;
468
{
469
char *plugin_option;
470
while((plugin_option = strsep(&arg, ",")) != NULL){
471
if(not add_argument(getplugin(NULL), plugin_option)){
472
break;
393
473
}
394
474
}
475
errno = 0;
395
476
}
396
477
break;
397
478
case 'G': /* --global-env */
398
if(arg == NULL){
399
break;
400
}
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
479
if(add_environment(getplugin(NULL), arg, true)){
480
errno = 0;
403
481
}
404
482
break;
405
483
case 'o': /* --options-for */
406
if(arg != NULL){
407
char *p_name = strsep(&arg, ":");
408
if(p_name[0] == '\0' or arg == NULL){
409
break;
410
}
411
char *opt = strsep(&arg, ":");
412
if(opt[0] == '\0' or opt == NULL){
413
break;
414
}
415
char *p;
416
while((p = strsep(&opt, ",")) != NULL){
417
if(p[0] == '\0'){
418
continue;
419
}
420
if(not add_argument(getplugin(p_name), p)){
421
perror("add_argument");
422
return ARGP_ERR_UNKNOWN;
423
}
424
}
484
{
485
char *option_list = strchr(arg, ':');
486
if(option_list == NULL){
487
argp_error(state, "No colon in \"%s\"", arg);
488
errno = EINVAL;
489
break;
490
}
491
*option_list = '\0';
492
option_list++;
493
if(arg[0] == '\0'){
494
argp_error(state, "Empty plugin name");
495
errno = EINVAL;
496
break;
497
}
498
char *option;
499
while((option = strsep(&option_list, ",")) != NULL){
500
if(not add_argument(getplugin(arg), option)){
501
break;
502
}
503
}
504
errno = 0;
425
505
}
426
506
break;
427
507
case 'E': /* --env-for */
428
if(arg == NULL){
429
break;
430
}
431
508
{
432
509
char *envdef = strchr(arg, ':');
433
510
if(envdef == NULL){
511
argp_error(state, "No colon in \"%s\"", arg);
512
errno = EINVAL;
434
513
break;
435
514
}
436
515
*envdef = '\0';
437
if(not add_environment(getplugin(arg), envdef+1, true)){
438
perror("add_environment");
516
envdef++;
517
if(arg[0] == '\0'){
518
argp_error(state, "Empty plugin name");
519
errno = EINVAL;
520
break;
521
}
522
if(add_environment(getplugin(arg), envdef, true)){
523
errno = 0;
439
524
}
440
525
}
441
526
break;
442
527
case 'd': /* --disable */
443
if(arg != NULL){
528
{
444
529
plugin *p = getplugin(arg);
445
if(p == NULL){
446
return ARGP_ERR_UNKNOWN;
530
if(p != NULL){
531
p->disabled = true;
532
errno = 0;
447
533
}
448
p->disabled = true;
449
534
}
450
535
break;
451
536
case 'e': /* --enable */
452
if(arg != NULL){
537
{
453
538
plugin *p = getplugin(arg);
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
539
if(p != NULL){
540
p->disabled = false;
541
errno = 0;
456
542
}
457
p->disabled = false;
458
543
}
459
544
break;
460
545
case 128: /* --plugin-dir */
461
546
free(plugindir);
462
547
plugindir = strdup(arg);
463
if(plugindir == NULL){
464
perror("strdup");
465
}
548
if(plugindir != NULL){
549
errno = 0;
550
}
466
551
break;
467
552
case 129: /* --config-file */
468
553
/* This is already done by parse_opt_config_file() */
469
554
break;
470
555
case 130: /* --userid */
471
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
472
if(ret < 1 or tmpmax != (uid_t)tmpmax
473
or arg[numchars] != '\0'){
474
fprintf(stderr, "Bad user ID number: \"%s\", using %"
475
PRIdMAX "\n", arg, (intmax_t)uid);
476
} else {
477
uid = (uid_t)tmpmax;
556
tmp_id = strtoimax(arg, &tmp, 10);
557
if(errno != 0 or tmp == arg or *tmp != '\0'
558
or tmp_id != (uid_t)tmp_id){
559
argp_error(state, "Bad user ID number: \"%s\", using %"
560
PRIdMAX, arg, (intmax_t)uid);
561
break;
478
562
}
563
uid = (uid_t)tmp_id;
564
errno = 0;
479
565
break;
480
566
case 131: /* --groupid */
481
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
482
if(ret < 1 or tmpmax != (gid_t)tmpmax
483
or arg[numchars] != '\0'){
484
fprintf(stderr, "Bad group ID number: \"%s\", using %"
485
PRIdMAX "\n", arg, (intmax_t)gid);
486
} else {
487
gid = (gid_t)tmpmax;
567
tmp_id = strtoimax(arg, &tmp, 10);
568
if(errno != 0 or tmp == arg or *tmp != '\0'
569
or tmp_id != (gid_t)tmp_id){
570
argp_error(state, "Bad group ID number: \"%s\", using %"
571
PRIdMAX, arg, (intmax_t)gid);
572
break;
488
573
}
574
gid = (gid_t)tmp_id;
575
errno = 0;
489
576
break;
490
577
case 132: /* --debug */
491
578
debug = true;
492
579
break;
580
case 133: /* --plugin-helper-dir */
581
free(pluginhelperdir);
582
pluginhelperdir = strdup(arg);
583
if(pluginhelperdir != NULL){
584
errno = 0;
585
}
586
break;
587
/*
588
* These reproduce what we would get without ARGP_NO_HELP
589
*/
590
case '?': /* --help */
591
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
592
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
593
__builtin_unreachable();
594
case -3: /* --usage */
595
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
596
argp_state_help(state, state->out_stream,
597
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
598
__builtin_unreachable();
599
case 'V': /* --version */
600
fprintf(state->out_stream, "%s\n", argp_program_version);
601
exit(EXIT_SUCCESS);
602
break;
493
603
/*
494
604
* When adding more options before this line, remember to also add a
495
605
* "case" to the "parse_opt_config_file" function below.
498
608
/* Cryptsetup always passes an argument, which is an empty
499
609
string if "none" was specified in /etc/crypttab. So if
500
610
argument was empty, we ignore it silently. */
501
if(arg[0] != '\0'){
502
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
611
if(arg[0] == '\0'){
612
break;
503
613
}
504
break;
505
case ARGP_KEY_END:
506
break;
614
#if __GNUC__ >= 7
615
__attribute__((fallthrough));
616
#else
617
/* FALLTHROUGH */
618
#endif
507
619
default:
508
620
return ARGP_ERR_UNKNOWN;
509
621
}
510
return 0;
622
return errno; /* Set to 0 at start */
511
623
}
512
624
513
625
/* This option parser is the same as parse_opt() above, except it
515
627
error_t parse_opt_config_file(int key, char *arg,
516
628
__attribute__((unused))
517
629
struct argp_state *state){
630
errno = 0;
518
631
switch(key){
519
632
case 'g': /* --global-options */
520
633
case 'G': /* --global-env */
527
640
case 129: /* --config-file */
528
641
free(argfile);
529
642
argfile = strdup(arg);
530
if(argfile == NULL){
531
perror("strdup");
643
if(argfile != NULL){
644
errno = 0;
532
645
}
533
break;
646
break;
534
647
case 130: /* --userid */
535
648
case 131: /* --groupid */
536
649
case 132: /* --debug */
650
case 133: /* --plugin-helper-dir */
651
case '?': /* --help */
652
case -3: /* --usage */
653
case 'V': /* --version */
537
654
case ARGP_KEY_ARG:
538
case ARGP_KEY_END:
539
655
break;
540
656
default:
541
657
return ARGP_ERR_UNKNOWN;
542
658
}
543
return 0;
659
return errno;
544
660
}
545
661
546
662
struct argp argp = { .options = options,
550
666
551
667
/* Parse using parse_opt_config_file() in order to get the custom
552
668
config file location, if any. */
553
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
554
if(ret == ARGP_ERR_UNKNOWN){
555
fprintf(stderr, "Unknown error while parsing arguments\n");
556
exitstatus = EXIT_FAILURE;
669
ret = argp_parse(&argp, argc, argv,
670
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
671
NULL, NULL);
672
switch(ret){
673
case 0:
674
break;
675
case ENOMEM:
676
default:
677
errno = ret;
678
error(0, errno, "argp_parse");
679
exitstatus = EX_OSERR;
680
goto fallback;
681
case EINVAL:
682
exitstatus = EX_USAGE;
557
683
goto fallback;
558
684
}
559
685
565
691
conffp = fopen(AFILE, "r");
566
692
} else {
567
693
conffp = fopen(argfile, "r");
568
}
694
}
569
695
if(conffp != NULL){
570
696
char *org_line = NULL;
571
697
char *p, *arg, *new_arg, *line;
572
698
size_t size = 0;
573
699
const char whitespace_delims[] = " \r\t\f\v\n";
574
700
const char comment_delim[] = "#";
575
701
576
702
custom_argc = 1;
577
703
custom_argv = malloc(sizeof(char*) * 2);
578
704
if(custom_argv == NULL){
579
perror("malloc");
580
exitstatus = EXIT_FAILURE;
705
error(0, errno, "malloc");
706
exitstatus = EX_OSERR;
581
707
goto fallback;
582
708
}
583
709
custom_argv[0] = argv[0];
584
710
custom_argv[1] = NULL;
585
711
586
712
/* for each line in the config file, strip whitespace and ignore
587
713
commented text */
588
714
while(true){
590
716
if(sret == -1){
591
717
break;
592
718
}
593
719
594
720
line = org_line;
595
721
arg = strsep(&line, comment_delim);
596
722
while((p = strsep(&arg, whitespace_delims)) != NULL){
599
725
}
600
726
new_arg = strdup(p);
601
727
if(new_arg == NULL){
602
perror("strdup");
603
exitstatus = EXIT_FAILURE;
728
error(0, errno, "strdup");
729
exitstatus = EX_OSERR;
604
730
free(org_line);
605
731
goto fallback;
606
732
}
607
733
608
734
custom_argc += 1;
609
custom_argv = realloc(custom_argv, sizeof(char *)
610
* ((unsigned int) custom_argc + 1));
611
if(custom_argv == NULL){
612
perror("realloc");
613
exitstatus = EXIT_FAILURE;
614
free(org_line);
615
goto fallback;
735
{
736
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
737
char **new_argv = reallocarray(custom_argv,
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
}
616
759
}
617
760
custom_argv[custom_argc-1] = new_arg;
618
custom_argv[custom_argc] = NULL;
761
custom_argv[custom_argc] = NULL;
619
762
}
620
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
}
621
772
free(org_line);
622
773
} else {
623
774
/* Check for harmful errors and go to fallback. Other errors might
624
775
not affect opening plugins */
625
776
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
626
perror("fopen");
627
exitstatus = EXIT_FAILURE;
777
error(0, errno, "fopen");
778
exitstatus = EX_OSERR;
628
779
goto fallback;
629
780
}
630
781
}
631
/* If there was any arguments from configuration file,
632
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 */
633
784
if(custom_argv != NULL){
634
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
635
0, NULL);
636
if(ret == ARGP_ERR_UNKNOWN){
637
fprintf(stderr, "Unknown error while parsing arguments\n");
638
exitstatus = EXIT_FAILURE;
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;
639
799
goto fallback;
640
800
}
641
801
}
642
802
643
803
/* Parse actual command line arguments, to let them override the
644
804
config file */
645
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
646
if(ret == ARGP_ERR_UNKNOWN){
647
fprintf(stderr, "Unknown error while parsing arguments\n");
648
exitstatus = EXIT_FAILURE;
649
goto fallback;
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
}
650
838
}
651
839
652
840
if(debug){
653
for(plugin *p = plugin_list; p != NULL; p=p->next){
841
for(plugin *p = plugin_list; p != NULL; p = p->next){
654
842
fprintf(stderr, "Plugin: %s has %d arguments\n",
655
843
p->name ? p->name : "Global", p->argc - 1);
656
844
for(char **a = p->argv; *a != NULL; a++){
663
851
}
664
852
}
665
853
666
/* Strip permissions down to nobody */
667
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);
668
889
if(ret == -1){
669
perror("setgid");
890
error(0, errno, "setgid");
670
891
}
671
892
ret = setuid(uid);
672
893
if(ret == -1){
673
perror("setuid");
674
}
675
676
if(plugindir == NULL){
677
dir = opendir(PDIR);
678
} else {
679
dir = opendir(plugindir);
680
}
681
682
if(dir == NULL){
683
perror("Could not open plugin dir");
684
exitstatus = EXIT_FAILURE;
685
goto fallback;
686
}
687
688
/* Set the FD_CLOEXEC flag on the directory, if possible */
894
error(0, errno, "setuid");
895
}
896
897
/* Open plugin directory with close_on_exec flag */
689
898
{
690
int dir_fd = dirfd(dir);
691
if(dir_fd >= 0){
692
ret = set_cloexec_flag(dir_fd);
693
if(ret < 0){
694
perror("set_cloexec_flag");
695
exitstatus = EXIT_FAILURE;
696
goto fallback;
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;
697
943
}
698
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;
699
955
}
700
956
701
957
FD_ZERO(&rfds_all);
702
958
703
959
/* Read and execute any executable in the plugin directory*/
704
while(true){
705
dirst = readdir(dir);
706
707
/* All directory entries have been processed */
708
if(dirst == NULL){
709
if(errno == EBADF){
710
perror("readdir");
711
exitstatus = EXIT_FAILURE;
712
goto fallback;
713
}
714
break;
715
}
716
717
d_name_len = strlen(dirst->d_name);
718
719
/* Ignore dotfiles, backup files and other junk */
720
{
721
bool bad_name = false;
722
723
const char const *bad_prefixes[] = { ".", "#", NULL };
724
725
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
726
".dpkg-old",
727
".dpkg-bak",
728
".dpkg-divert", NULL };
729
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
730
size_t pre_len = strlen(*pre);
731
if((d_name_len >= pre_len)
732
and strncmp((dirst->d_name), *pre, pre_len) == 0){
733
if(debug){
734
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
735
" with bad prefix %s\n", dirst->d_name, *pre);
736
}
737
bad_name = true;
738
break;
739
}
740
}
741
if(bad_name){
742
continue;
743
}
744
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
745
size_t suf_len = strlen(*suf);
746
if((d_name_len >= suf_len)
747
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
748
== 0)){
749
if(debug){
750
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
751
" with bad suffix %s\n", dirst->d_name, *suf);
752
}
753
bad_name = true;
754
break;
755
}
756
}
757
758
if(bad_name){
759
continue;
760
}
761
}
762
763
char *filename;
764
if(plugindir == NULL){
765
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
766
} else {
767
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
768
}
769
if(ret < 0){
770
perror("asprintf");
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]);
771
966
continue;
772
967
}
773
774
ret = stat(filename, &st);
968
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
775
969
if(ret == -1){
776
perror("stat");
777
free(filename);
970
error(0, errno, "stat");
971
close(plugin_fd);
972
free(direntries[i]);
778
973
continue;
779
974
}
780
975
781
976
/* Ignore non-executable files */
782
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)){
783
980
if(debug){
784
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
785
" 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);
786
985
}
787
free(filename);
986
close(plugin_fd);
987
free(direntries[i]);
788
988
continue;
789
989
}
790
990
791
plugin *p = getplugin(dirst->d_name);
991
plugin *p = getplugin(direntries[i]->d_name);
792
992
if(p == NULL){
793
perror("getplugin");
794
free(filename);
993
error(0, errno, "getplugin");
994
close(plugin_fd);
995
free(direntries[i]);
795
996
continue;
796
997
}
797
998
if(p->disabled){
798
999
if(debug){
799
1000
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
800
dirst->d_name);
1001
direntries[i]->d_name);
801
1002
}
802
free(filename);
1003
close(plugin_fd);
1004
free(direntries[i]);
803
1005
continue;
804
1006
}
805
1007
{
808
1010
if(g != NULL){
809
1011
for(char **a = g->argv + 1; *a != NULL; a++){
810
1012
if(not add_argument(p, *a)){
811
perror("add_argument");
1013
error(0, errno, "add_argument");
812
1014
}
813
1015
}
814
1016
/* Add global environment variables */
815
1017
for(char **e = g->environ; *e != NULL; e++){
816
1018
if(not add_environment(p, *e, false)){
817
perror("add_environment");
1019
error(0, errno, "add_environment");
818
1020
}
819
1021
}
820
1022
}
821
1023
}
822
/* If this plugin has any environment variables, we will call
823
using execve and need to duplicate the environment from this
824
process, too. */
1024
/* If this plugin has any environment variables, we need to
1025
duplicate the environment from this process, too. */
825
1026
if(p->environ[0] != NULL){
826
1027
for(char **e = environ; *e != NULL; e++){
827
1028
if(not add_environment(p, *e, false)){
828
perror("add_environment");
1029
error(0, errno, "add_environment");
829
1030
}
830
1031
}
831
1032
}
832
1033
833
1034
int pipefd[2];
834
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 */
835
1040
if(ret == -1){
836
perror("pipe");
837
exitstatus = EXIT_FAILURE;
838
goto fallback;
839
}
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
840
1056
/* Ask OS to automatic close the pipe on exec */
841
1057
ret = set_cloexec_flag(pipefd[0]);
842
1058
if(ret < 0){
843
perror("set_cloexec_flag");
844
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]);
845
1064
goto fallback;
846
1065
}
847
1066
ret = set_cloexec_flag(pipefd[1]);
848
1067
if(ret < 0){
849
perror("set_cloexec_flag");
850
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]);
851
1073
goto fallback;
852
1074
}
1075
#endif /* not O_CLOEXEC */
853
1076
/* Block SIGCHLD until process is safely in process list */
854
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));
855
1080
if(ret < 0){
856
perror("sigprocmask");
857
exitstatus = EXIT_FAILURE;
1081
error(0, errno, "sigprocmask");
1082
exitstatus = EX_OSERR;
1083
free(direntries[i]);
858
1084
goto fallback;
859
1085
}
860
1086
/* Starting a new process to be watched */
861
pid_t pid = fork();
1087
pid_t pid;
1088
do {
1089
pid = fork();
1090
} while(pid == -1 and errno == EINTR);
862
1091
if(pid == -1){
863
perror("fork");
864
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]);
865
1099
goto fallback;
866
1100
}
867
1101
if(pid == 0){
868
1102
/* this is the child process */
869
1103
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
870
1104
if(ret < 0){
871
perror("sigaction");
872
_exit(EXIT_FAILURE);
1105
error(0, errno, "sigaction");
1106
_exit(EX_OSERR);
873
1107
}
874
1108
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
875
1109
if(ret < 0){
876
perror("sigprocmask");
877
_exit(EXIT_FAILURE);
1110
error(0, errno, "sigprocmask");
1111
_exit(EX_OSERR);
878
1112
}
879
1113
880
1114
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
881
1115
if(ret == -1){
882
perror("dup2");
883
_exit(EXIT_FAILURE);
1116
error(0, errno, "dup2");
1117
_exit(EX_OSERR);
884
1118
}
885
1119
886
if(dirfd(dir) < 0){
887
/* If dir has no file descriptor, we could not set FD_CLOEXEC
888
above and must now close it manually here. */
889
closedir(dir);
890
}
891
if(p->environ[0] == NULL){
892
if(execv(filename, p->argv) < 0){
893
perror("execv");
894
_exit(EXIT_FAILURE);
895
}
896
} else {
897
if(execve(filename, p->argv, p->environ) < 0){
898
perror("execve");
899
_exit(EXIT_FAILURE);
900
}
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);
901
1126
}
902
1127
/* no return */
903
1128
}
904
1129
/* Parent process */
905
1130
close(pipefd[1]); /* Close unused write end of pipe */
906
free(filename);
907
plugin *new_plugin = getplugin(dirst->d_name);
1131
close(plugin_fd);
1132
plugin *new_plugin = getplugin(direntries[i]->d_name);
908
1133
if(new_plugin == NULL){
909
perror("getplugin");
910
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)));
911
1138
if(ret < 0){
912
perror("sigprocmask");
1139
error(0, errno, "sigprocmask");
913
1140
}
914
exitstatus = EXIT_FAILURE;
1141
exitstatus = EX_OSERR;
1142
free(direntries[i]);
915
1143
goto fallback;
916
1144
}
1145
free(direntries[i]);
917
1146
918
1147
new_plugin->pid = pid;
919
1148
new_plugin->fd = pipefd[0];
920
1149
1150
if(debug){
1151
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1152
new_plugin->name, (intmax_t) (new_plugin->pid));
1153
}
1154
921
1155
/* Unblock SIGCHLD so signal handler can be run if this process
922
1156
has already completed */
923
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));
924
1160
if(ret < 0){
925
perror("sigprocmask");
926
exitstatus = EXIT_FAILURE;
1161
error(0, errno, "sigprocmask");
1162
exitstatus = EX_OSERR;
927
1163
goto fallback;
928
1164
}
929
1165
934
1170
}
935
1171
}
936
1172
937
closedir(dir);
938
dir = NULL;
1173
free(direntries);
1174
direntries = NULL;
1175
close(dir_fd);
1176
dir_fd = -1;
1177
free_plugin(getplugin(NULL));
939
1178
940
1179
for(plugin *p = plugin_list; p != NULL; p = p->next){
941
1180
if(p->pid != 0){
952
1191
while(plugin_list){
953
1192
fd_set rfds = rfds_all;
954
1193
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
955
if(select_ret == -1){
956
perror("select");
957
exitstatus = EXIT_FAILURE;
1194
if(select_ret == -1 and errno != EINTR){
1195
error(0, errno, "select");
1196
exitstatus = EX_OSERR;
958
1197
goto fallback;
959
1198
}
960
1199
/* OK, now either a process completed, or something can be read
966
1205
if(not WIFEXITED(proc->status)
967
1206
or WEXITSTATUS(proc->status) != 0){
968
1207
/* Bad exit by plugin */
969
1208
970
1209
if(debug){
971
1210
if(WIFEXITED(proc->status)){
972
1211
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
975
1214
WEXITSTATUS(proc->status));
976
1215
} else if(WIFSIGNALED(proc->status)){
977
1216
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
978
" signal %d\n", proc->name,
1217
" signal %d: %s\n", proc->name,
979
1218
(intmax_t) (proc->pid),
980
WTERMSIG(proc->status));
981
} else if(WCOREDUMP(proc->status)){
982
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
983
" core\n", proc->name, (intmax_t) (proc->pid));
1219
WTERMSIG(proc->status),
1220
strsignal(WTERMSIG(proc->status)));
984
1221
}
985
1222
}
986
1223
987
1224
/* Remove the plugin */
988
1225
FD_CLR(proc->fd, &rfds_all);
989
1226
990
1227
/* Block signal while modifying process_list */
991
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));
992
1232
if(ret < 0){
993
perror("sigprocmask");
994
exitstatus = EXIT_FAILURE;
1233
error(0, errno, "sigprocmask");
1234
exitstatus = EX_OSERR;
995
1235
goto fallback;
996
1236
}
997
1237
1000
1240
proc = next_plugin;
1001
1241
1002
1242
/* We are done modifying process list, so unblock signal */
1003
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1004
NULL);
1243
ret = (int)(TEMP_FAILURE_RETRY
1244
(sigprocmask(SIG_UNBLOCK,
1245
&sigchld_action.sa_mask, NULL)));
1005
1246
if(ret < 0){
1006
perror("sigprocmask");
1007
exitstatus = EXIT_FAILURE;
1247
error(0, errno, "sigprocmask");
1248
exitstatus = EX_OSERR;
1008
1249
goto fallback;
1009
1250
}
1010
1251
1020
1261
bool bret = print_out_password(proc->buffer,
1021
1262
proc->buffer_length);
1022
1263
if(not bret){
1023
perror("print_out_password");
1024
exitstatus = EXIT_FAILURE;
1264
error(0, errno, "print_out_password");
1265
exitstatus = EX_IOERR;
1025
1266
}
1026
1267
goto fallback;
1027
1268
}
1034
1275
}
1035
1276
/* Before reading, make the process' data buffer large enough */
1036
1277
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1037
proc->buffer = realloc(proc->buffer, proc->buffer_size
1038
+ (size_t) BUFFER_SIZE);
1039
if(proc->buffer == NULL){
1040
perror("malloc");
1041
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;
1042
1283
goto fallback;
1043
1284
}
1285
proc->buffer = new_buffer;
1044
1286
proc->buffer_size += BUFFER_SIZE;
1045
1287
}
1046
1288
/* Read from the process */
1047
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1048
BUFFER_SIZE);
1289
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1290
proc->buffer
1291
+ proc->buffer_length,
1292
BUFFER_SIZE));
1049
1293
if(sret < 0){
1050
1294
/* Read error from this process; ignore the error */
1051
1295
proc = proc->next;
1059
1303
}
1060
1304
}
1061
1305
}
1062
1063
1306
1307
1064
1308
fallback:
1065
1309
1066
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1310
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1311
and exitstatus != EX_OK)){
1067
1312
/* Fallback if all plugins failed, none are found or an error
1068
1313
occured */
1069
1314
bool bret;
1077
1322
}
1078
1323
bret = print_out_password(passwordbuffer, len);
1079
1324
if(not bret){
1080
perror("print_out_password");
1081
exitstatus = EXIT_FAILURE;
1325
error(0, errno, "print_out_password");
1326
exitstatus = EX_IOERR;
1082
1327
}
1083
1328
}
1084
1329
1085
1330
/* Restore old signal handler */
1086
1331
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1087
1332
if(ret == -1){
1088
perror("sigaction");
1089
exitstatus = EXIT_FAILURE;
1333
error(0, errno, "sigaction");
1334
exitstatus = EX_OSERR;
1090
1335
}
1091
1336
1092
1337
if(custom_argv != NULL){
1096
1341
free(custom_argv);
1097
1342
}
1098
1343
1099
if(dir != NULL){
1100
closedir(dir);
1344
free(direntries);
1345
1346
if(dir_fd != -1){
1347
close(dir_fd);
1101
1348
}
1102
1349
1103
1350
/* Kill the processes */
1107
1354
ret = kill(p->pid, SIGTERM);
1108
1355
if(ret == -1 and errno != ESRCH){
1109
1356
/* Set-uid proccesses might not get closed */
1110
perror("kill");
1357
error(0, errno, "kill");
1111
1358
}
1112
1359
}
1113
1360
}
1114
1361
1115
1362
/* Wait for any remaining child processes to terminate */
1116
do{
1363
do {
1117
1364
ret = wait(NULL);
1118
1365
} while(ret >= 0);
1119
1366
if(errno != ECHILD){
1120
perror("wait");
1367
error(0, errno, "wait");
1121
1368
}
1122
1369
1123
1370
free_plugin_list();
1124
1371
1125
1372
free(plugindir);
1373
free(pluginhelperdir);
1126
1374
free(argfile);
1127
1375
1128
1376
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0