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- Committer: Teddy Hogeborn
- Date: 2019-07-29 16:35:53 UTC
- Revision ID: teddy@recompile.se-20190729163553-1i442i2cbx64c537
Make tests and man page examples match
Make the tests test_manual_page_example[1-5] match exactly what is
written in the manual page, and add comments to manual page as
reminders to keep tests and manual page examples in sync.
* mandos-ctl (Test_commands_from_options.test_manual_page_example_1):
Remove "--verbose" option, since the manual does not have it as the
first example, and change assertion to match.
* mandos-ctl.xml (EXAMPLE): Add comments to all examples documenting
which test function they correspond to. Also remove unnecessary
quotes from option arguments in fourth example, and clarify language
slightly in fifth example.
Make the tests test_manual_page_example[1-5] match exactly what is
written in the manual page, and add comments to manual page as
reminders to keep tests and manual page examples in sync.
* mandos-ctl (Test_commands_from_options.test_manual_page_example_1):
Remove "--verbose" option, since the manual does not have it as the
first example, and change assertion to match.
* mandos-ctl.xml (EXAMPLE): Add comments to all examples documenting
which test function they correspond to. Also remove unnecessary
quotes from option arguments in fourth example, and clarify language
slightly in fifth example.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
6
*
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
9
* published by the Free Software Foundation, either version 3 of the
10
* License, or (at your option) any later version.
11
*
12
* This program is distributed in the hope that it will be useful, but
5
* Copyright © 2008-2018 Teddy Hogeborn
6
* Copyright © 2008-2018 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
13
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
14
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15
18
* General Public License for more details.
16
19
*
17
20
* You should have received a copy of the GNU General Public License
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
20
22
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
22
24
*/
23
25
24
26
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
27
O_CLOEXEC, pipe2() */
26
28
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
30
realloc() */
29
31
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
32
#include <stdio.h> /* fileno(), fprintf(),
33
stderr, STDOUT_FILENO, fclose() */
34
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
35
WIFEXITED(), WEXITSTATUS(), wait(),
36
pid_t, uid_t, gid_t, getuid(),
37
getgid() */
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
43
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
55
57
#include <errno.h> /* errno */
56
58
#include <argp.h> /* struct argp_option, struct
57
59
argp_state, struct argp,
61
63
#include <signal.h> /* struct sigaction, sigemptyset(),
62
64
sigaddset(), sigaction(),
63
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
65
68
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
66
75
67
76
#define BUFFER_SIZE 256
68
77
69
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
70
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
81
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct plugin;
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
84
77
85
typedef struct plugin{
78
86
char *name; /* can be NULL or any plugin name */
81
89
char **environ;
82
90
int envc;
83
91
bool disabled;
84
92
85
93
/* Variables used for running processes*/
86
94
pid_t pid;
87
95
int fd;
89
97
size_t buffer_size;
90
98
size_t buffer_length;
91
99
bool eof;
92
volatile bool completed;
93
volatile int status;
100
volatile sig_atomic_t completed;
101
int status;
94
102
struct plugin *next;
95
103
} plugin;
96
104
97
105
static plugin *plugin_list = NULL;
98
106
99
/* Gets a existing plugin based on name,
107
/* Gets an existing plugin based on name,
100
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
101
110
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
104
if ((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
111
/* Check for existing plugin with that name */
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
if((p->name == name)
114
or (p->name and name and (strcmp(p->name, name) == 0))){
106
115
return p;
107
116
}
108
117
}
109
118
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
112
124
return NULL;
113
125
}
114
126
char *copy_name = NULL;
115
127
if(name != NULL){
116
copy_name = strdup(name);
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
117
131
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
118
135
return NULL;
119
136
}
120
137
}
121
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
126
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
138
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
143
144
do {
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
147
if(new_plugin->argv == NULL){
148
int e = errno;
129
149
free(copy_name);
130
150
free(new_plugin);
151
errno = e;
131
152
return NULL;
132
153
}
133
154
new_plugin->argv[0] = copy_name;
134
155
new_plugin->argv[1] = NULL;
135
136
new_plugin->environ = malloc(sizeof(char *));
156
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
137
160
if(new_plugin->environ == NULL){
161
int e = errno;
138
162
free(copy_name);
139
163
free(new_plugin->argv);
140
164
free(new_plugin);
165
errno = e;
141
166
return NULL;
142
167
}
143
168
new_plugin->environ[0] = NULL;
144
169
145
170
/* Append the new plugin to the list */
146
171
plugin_list = new_plugin;
147
172
return new_plugin;
148
173
}
149
174
150
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
151
177
static bool add_to_char_array(const char *new, char ***array,
152
178
int *len){
153
179
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
180
char **new_array = NULL;
181
do {
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
156
185
/* Malloc check */
157
if(*array == NULL){
186
if(new_array == NULL){
158
187
return false;
159
188
}
189
*array = new_array;
160
190
/* Make a copy of the new string */
161
char *copy = strdup(new);
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
162
195
if(copy == NULL){
163
196
return false;
164
197
}
171
204
}
172
205
173
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
174
208
static bool add_argument(plugin *p, const char *arg){
175
209
if(p == NULL){
176
210
return false;
179
213
}
180
214
181
215
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def){
216
__attribute__((nonnull(2), warn_unused_result))
217
static bool add_environment(plugin *p, const char *def, bool replace){
183
218
if(p == NULL){
184
219
return false;
185
220
}
221
/* namelen = length of name of environment variable */
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
/* Search for this environment variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
226
/* It already exists */
227
if(replace){
228
char *new_envdef;
229
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
233
return false;
234
}
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
237
}
238
return true;
239
}
240
}
186
241
return add_to_char_array(def, &(p->environ), &(p->envc));
187
242
}
188
243
244
#ifndef O_CLOEXEC
189
245
/*
190
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
191
247
* Descriptor Flags".
192
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
193
249
*/
194
static int set_cloexec_flag(int fd)
195
{
196
int ret = fcntl(fd, F_GETFD, 0);
250
__attribute__((warn_unused_result))
251
static int set_cloexec_flag(int fd){
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
197
253
/* If reading the flags failed, return error indication now. */
198
254
if(ret < 0){
199
255
return ret;
200
256
}
201
257
/* Store modified flag word in the descriptor. */
202
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
203
260
}
261
#endif /* not O_CLOEXEC */
204
262
205
263
206
264
/* Mark processes as completed when they exit, and save their exit
207
265
status. */
208
void handle_sigchld(__attribute__((unused)) int sig){
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
209
268
while(true){
210
269
plugin *proc = plugin_list;
211
270
int status;
215
274
break;
216
275
}
217
276
if(pid == -1){
218
if (errno != ECHILD){
219
perror("waitpid");
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
220
280
}
221
/* No child processes */
222
break;
281
error(0, errno, "waitpid");
223
282
}
224
283
225
284
/* A child exited, find it in process_list */
226
285
while(proc != NULL and proc->pid != pid){
227
286
proc = proc->next;
231
290
continue;
232
291
}
233
292
proc->status = status;
234
proc->completed = true;
293
proc->completed = 1;
235
294
}
295
errno = old_errno;
236
296
}
237
297
238
298
/* Prints out a password to stdout */
239
bool print_out_password(const char *buffer, size_t length){
299
__attribute__((nonnull, warn_unused_result))
300
static bool print_out_password(const char *buffer, size_t length){
240
301
ssize_t ret;
241
if(length>0 and buffer[length-1] == '\n'){
242
length--;
243
}
244
302
for(size_t written = 0; written < length; written += (size_t)ret){
245
303
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
246
304
length - written));
252
310
}
253
311
254
312
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
255
314
static void free_plugin(plugin *plugin_node){
256
315
257
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
316
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
258
317
free(*arg);
259
318
}
319
free(plugin_node->name);
260
320
free(plugin_node->argv);
261
321
for(char **env = plugin_node->environ; *env != NULL; env++){
262
322
free(*env);
263
323
}
264
324
free(plugin_node->environ);
265
325
free(plugin_node->buffer);
266
326
267
327
/* Removes the plugin from the singly-linked list */
268
328
if(plugin_node == plugin_list){
269
329
/* First one - simple */
289
349
290
350
int main(int argc, char *argv[]){
291
351
char *plugindir = NULL;
352
char *pluginhelperdir = NULL;
292
353
char *argfile = NULL;
293
354
FILE *conffp;
294
size_t d_name_len;
295
DIR *dir = NULL;
296
struct dirent *dirst;
355
struct dirent **direntries = NULL;
297
356
struct stat st;
298
357
fd_set rfds_all;
299
358
int ret, maxfd = 0;
359
ssize_t sret;
300
360
uid_t uid = 65534;
301
361
gid_t gid = 65534;
302
362
bool debug = false;
306
366
.sa_flags = SA_NOCLDSTOP };
307
367
char **custom_argv = NULL;
308
368
int custom_argc = 0;
369
int dir_fd = -1;
309
370
310
371
/* Establish a signal handler */
311
372
sigemptyset(&sigchld_action.sa_mask);
312
373
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
313
374
if(ret == -1){
314
perror("sigaddset");
315
exitstatus = EXIT_FAILURE;
375
error(0, errno, "sigaddset");
376
exitstatus = EX_OSERR;
316
377
goto fallback;
317
378
}
318
379
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
319
380
if(ret == -1){
320
perror("sigaction");
321
exitstatus = EXIT_FAILURE;
381
error(0, errno, "sigaction");
382
exitstatus = EX_OSERR;
322
383
goto fallback;
323
384
}
324
385
327
388
{ .name = "global-options", .key = 'g',
328
389
.arg = "OPTION[,OPTION[,...]]",
329
390
.doc = "Options passed to all plugins" },
330
{ .name = "global-envs", .key = 'e',
391
{ .name = "global-env", .key = 'G',
331
392
.arg = "VAR=value",
332
393
.doc = "Environment variable passed to all plugins" },
333
394
{ .name = "options-for", .key = 'o',
334
395
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
335
396
.doc = "Options passed only to specified plugin" },
336
{ .name = "envs-for", .key = 'f',
397
{ .name = "env-for", .key = 'E',
337
398
.arg = "PLUGIN:ENV=value",
338
399
.doc = "Environment variable passed to specified plugin" },
339
400
{ .name = "disable", .key = 'd',
340
401
.arg = "PLUGIN",
341
402
.doc = "Disable a specific plugin", .group = 1 },
403
{ .name = "enable", .key = 'e',
404
.arg = "PLUGIN",
405
.doc = "Enable a specific plugin", .group = 1 },
342
406
{ .name = "plugin-dir", .key = 128,
343
407
.arg = "DIRECTORY",
344
408
.doc = "Specify a different plugin directory", .group = 2 },
353
417
.doc = "Group ID the plugins will run as", .group = 3 },
354
418
{ .name = "debug", .key = 132,
355
419
.doc = "Debug mode", .group = 4 },
420
{ .name = "plugin-helper-dir", .key = 133,
421
.arg = "DIRECTORY",
422
.doc = "Specify a different plugin helper directory",
423
.group = 2 },
424
/*
425
* These reproduce what we would get without ARGP_NO_HELP
426
*/
427
{ .name = "help", .key = '?',
428
.doc = "Give this help list", .group = -1 },
429
{ .name = "usage", .key = -3,
430
.doc = "Give a short usage message", .group = -1 },
431
{ .name = "version", .key = 'V',
432
.doc = "Print program version", .group = -1 },
356
433
{ .name = NULL }
357
434
};
358
435
359
error_t parse_opt (int key, char *arg, __attribute__((unused)) struct argp_state *state) {
360
/* Get the INPUT argument from `argp_parse', which we know is a
361
pointer to our plugin list pointer. */
362
switch (key) {
436
__attribute__((nonnull(3)))
437
error_t parse_opt(int key, char *arg, struct argp_state *state){
438
errno = 0;
439
switch(key){
440
char *tmp;
441
intmax_t tmp_id;
363
442
case 'g': /* --global-options */
364
if (arg != NULL){
365
char *p;
366
while((p = strsep(&arg, ",")) != NULL){
367
if(p[0] == '\0'){
368
continue;
369
}
370
if(not add_argument(getplugin(NULL), p)){
371
perror("add_argument");
372
return ARGP_ERR_UNKNOWN;
373
}
374
}
375
}
376
break;
377
case 'e': /* --global-envs */
378
if(arg == NULL){
379
break;
380
}
381
443
{
382
char *envdef = strdup(arg);
383
if(envdef == NULL){
384
break;
385
}
386
if(not add_environment(getplugin(NULL), envdef)){
387
perror("add_environment");
388
}
444
char *plugin_option;
445
while((plugin_option = strsep(&arg, ",")) != NULL){
446
if(not add_argument(getplugin(NULL), plugin_option)){
447
break;
448
}
449
}
450
errno = 0;
451
}
452
break;
453
case 'G': /* --global-env */
454
if(add_environment(getplugin(NULL), arg, true)){
455
errno = 0;
389
456
}
390
457
break;
391
458
case 'o': /* --options-for */
392
if (arg != NULL){
393
char *p_name = strsep(&arg, ":");
394
if(p_name[0] == '\0'){
395
break;
396
}
397
char *opt = strsep(&arg, ":");
398
if(opt[0] == '\0'){
399
break;
400
}
401
if(opt != NULL){
402
char *p;
403
while((p = strsep(&opt, ",")) != NULL){
404
if(p[0] == '\0'){
405
continue;
406
}
407
if(not add_argument(getplugin(p_name), p)){
408
perror("add_argument");
409
return ARGP_ERR_UNKNOWN;
410
}
459
{
460
char *option_list = strchr(arg, ':');
461
if(option_list == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
break;
465
}
466
*option_list = '\0';
467
option_list++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
472
}
473
char *option;
474
while((option = strsep(&option_list, ",")) != NULL){
475
if(not add_argument(getplugin(arg), option)){
476
break;
411
477
}
412
478
}
479
errno = 0;
413
480
}
414
481
break;
415
case 'f': /* --envs-for */
416
if(arg == NULL){
417
break;
418
}
482
case 'E': /* --env-for */
419
483
{
420
484
char *envdef = strchr(arg, ':');
421
485
if(envdef == NULL){
422
break;
423
}
424
char *p_name = strndup(arg, (size_t) (envdef-arg));
425
if(p_name == NULL){
426
break;
427
}
486
argp_error(state, "No colon in \"%s\"", arg);
487
errno = EINVAL;
488
break;
489
}
490
*envdef = '\0';
428
491
envdef++;
429
if(not add_environment(getplugin(p_name), envdef)){
430
perror("add_environment");
492
if(arg[0] == '\0'){
493
argp_error(state, "Empty plugin name");
494
errno = EINVAL;
495
break;
496
}
497
if(add_environment(getplugin(arg), envdef, true)){
498
errno = 0;
431
499
}
432
500
}
433
501
break;
434
502
case 'd': /* --disable */
435
if (arg != NULL){
436
plugin *p = getplugin(arg);
437
if(p == NULL){
438
return ARGP_ERR_UNKNOWN;
439
}
440
p->disabled = true;
503
{
504
plugin *p = getplugin(arg);
505
if(p != NULL){
506
p->disabled = true;
507
errno = 0;
508
}
509
}
510
break;
511
case 'e': /* --enable */
512
{
513
plugin *p = getplugin(arg);
514
if(p != NULL){
515
p->disabled = false;
516
errno = 0;
517
}
441
518
}
442
519
break;
443
520
case 128: /* --plugin-dir */
521
free(plugindir);
444
522
plugindir = strdup(arg);
445
if(plugindir == NULL){
446
perror("strdup");
447
}
448
break;
449
case 129: /* --config-file */
523
if(plugindir != NULL){
524
errno = 0;
525
}
526
break;
527
case 129: /* --config-file */
528
/* This is already done by parse_opt_config_file() */
529
break;
530
case 130: /* --userid */
531
tmp_id = strtoimax(arg, &tmp, 10);
532
if(errno != 0 or tmp == arg or *tmp != '\0'
533
or tmp_id != (uid_t)tmp_id){
534
argp_error(state, "Bad user ID number: \"%s\", using %"
535
PRIdMAX, arg, (intmax_t)uid);
536
break;
537
}
538
uid = (uid_t)tmp_id;
539
errno = 0;
540
break;
541
case 131: /* --groupid */
542
tmp_id = strtoimax(arg, &tmp, 10);
543
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (gid_t)tmp_id){
545
argp_error(state, "Bad group ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)gid);
547
break;
548
}
549
gid = (gid_t)tmp_id;
550
errno = 0;
551
break;
552
case 132: /* --debug */
553
debug = true;
554
break;
555
case 133: /* --plugin-helper-dir */
556
free(pluginhelperdir);
557
pluginhelperdir = strdup(arg);
558
if(pluginhelperdir != NULL){
559
errno = 0;
560
}
561
break;
562
/*
563
* These reproduce what we would get without ARGP_NO_HELP
564
*/
565
case '?': /* --help */
566
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
567
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
568
__builtin_unreachable();
569
case -3: /* --usage */
570
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
571
argp_state_help(state, state->out_stream,
572
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
573
__builtin_unreachable();
574
case 'V': /* --version */
575
fprintf(state->out_stream, "%s\n", argp_program_version);
576
exit(EXIT_SUCCESS);
577
break;
578
/*
579
* When adding more options before this line, remember to also add a
580
* "case" to the "parse_opt_config_file" function below.
581
*/
582
case ARGP_KEY_ARG:
583
/* Cryptsetup always passes an argument, which is an empty
584
string if "none" was specified in /etc/crypttab. So if
585
argument was empty, we ignore it silently. */
586
if(arg[0] == '\0'){
587
break;
588
}
589
#if __GNUC__ >= 7
590
__attribute__((fallthrough));
591
#else
592
/* FALLTHROUGH */
593
#endif
594
default:
595
return ARGP_ERR_UNKNOWN;
596
}
597
return errno; /* Set to 0 at start */
598
}
599
600
/* This option parser is the same as parse_opt() above, except it
601
ignores everything but the --config-file option. */
602
error_t parse_opt_config_file(int key, char *arg,
603
__attribute__((unused))
604
struct argp_state *state){
605
errno = 0;
606
switch(key){
607
case 'g': /* --global-options */
608
case 'G': /* --global-env */
609
case 'o': /* --options-for */
610
case 'E': /* --env-for */
611
case 'd': /* --disable */
612
case 'e': /* --enable */
613
case 128: /* --plugin-dir */
614
break;
615
case 129: /* --config-file */
616
free(argfile);
450
617
argfile = strdup(arg);
451
if(argfile == NULL){
452
perror("strdup");
618
if(argfile != NULL){
619
errno = 0;
453
620
}
454
break;
621
break;
455
622
case 130: /* --userid */
456
uid = (uid_t)strtol(arg, NULL, 10);
457
break;
458
623
case 131: /* --groupid */
459
gid = (gid_t)strtol(arg, NULL, 10);
460
break;
461
624
case 132: /* --debug */
462
debug = true;
463
break;
625
case 133: /* --plugin-helper-dir */
626
case '?': /* --help */
627
case -3: /* --usage */
628
case 'V': /* --version */
464
629
case ARGP_KEY_ARG:
465
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
466
break;
467
case ARGP_KEY_END:
468
630
break;
469
631
default:
470
632
return ARGP_ERR_UNKNOWN;
471
633
}
472
return 0;
634
return errno;
473
635
}
474
636
475
struct argp argp = { .options = options, .parser = parse_opt,
476
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
637
struct argp argp = { .options = options,
638
.parser = parse_opt_config_file,
639
.args_doc = "",
477
640
.doc = "Mandos plugin runner -- Run plugins" };
478
641
479
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
480
if (ret == ARGP_ERR_UNKNOWN){
481
fprintf(stderr, "Unknown error while parsing arguments\n");
482
exitstatus = EXIT_FAILURE;
642
/* Parse using parse_opt_config_file() in order to get the custom
643
config file location, if any. */
644
ret = argp_parse(&argp, argc, argv,
645
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
646
NULL, NULL);
647
switch(ret){
648
case 0:
649
break;
650
case ENOMEM:
651
default:
652
errno = ret;
653
error(0, errno, "argp_parse");
654
exitstatus = EX_OSERR;
655
goto fallback;
656
case EINVAL:
657
exitstatus = EX_USAGE;
483
658
goto fallback;
484
659
}
485
486
/* Opens the configfile if aviable */
487
if (argfile == NULL){
660
661
/* Reset to the normal argument parser */
662
argp.parser = parse_opt;
663
664
/* Open the configfile if available */
665
if(argfile == NULL){
488
666
conffp = fopen(AFILE, "r");
489
667
} else {
490
668
conffp = fopen(argfile, "r");
491
}
669
}
492
670
if(conffp != NULL){
493
671
char *org_line = NULL;
494
672
char *p, *arg, *new_arg, *line;
495
673
size_t size = 0;
496
ssize_t sret;
497
674
const char whitespace_delims[] = " \r\t\f\v\n";
498
675
const char comment_delim[] = "#";
499
676
500
677
custom_argc = 1;
501
678
custom_argv = malloc(sizeof(char*) * 2);
502
679
if(custom_argv == NULL){
503
perror("malloc");
504
exitstatus = EXIT_FAILURE;
680
error(0, errno, "malloc");
681
exitstatus = EX_OSERR;
505
682
goto fallback;
506
683
}
507
684
custom_argv[0] = argv[0];
508
685
custom_argv[1] = NULL;
509
510
/* for each line in the config file, strip whitespace and ignore commented text */
686
687
/* for each line in the config file, strip whitespace and ignore
688
commented text */
511
689
while(true){
512
690
sret = getline(&org_line, &size, conffp);
513
691
if(sret == -1){
514
692
break;
515
693
}
516
694
517
695
line = org_line;
518
696
arg = strsep(&line, comment_delim);
519
697
while((p = strsep(&arg, whitespace_delims)) != NULL){
522
700
}
523
701
new_arg = strdup(p);
524
702
if(new_arg == NULL){
525
perror("strdup");
526
exitstatus = EXIT_FAILURE;
703
error(0, errno, "strdup");
704
exitstatus = EX_OSERR;
527
705
free(org_line);
528
706
goto fallback;
529
707
}
530
708
531
709
custom_argc += 1;
532
custom_argv = realloc(custom_argv, sizeof(char *)
533
* ((unsigned int) custom_argc + 1));
534
if(custom_argv == NULL){
535
perror("realloc");
536
exitstatus = EXIT_FAILURE;
537
free(org_line);
538
goto fallback;
710
{
711
char **new_argv = realloc(custom_argv, sizeof(char *)
712
* ((size_t)custom_argc + 1));
713
if(new_argv == NULL){
714
error(0, errno, "realloc");
715
exitstatus = EX_OSERR;
716
free(new_arg);
717
free(org_line);
718
goto fallback;
719
} else {
720
custom_argv = new_argv;
721
}
539
722
}
540
723
custom_argv[custom_argc-1] = new_arg;
541
custom_argv[custom_argc] = NULL;
724
custom_argv[custom_argc] = NULL;
542
725
}
543
726
}
727
do {
728
ret = fclose(conffp);
729
} while(ret == EOF and errno == EINTR);
730
if(ret == EOF){
731
error(0, errno, "fclose");
732
exitstatus = EX_IOERR;
733
goto fallback;
734
}
544
735
free(org_line);
545
} else{
736
} else {
546
737
/* Check for harmful errors and go to fallback. Other errors might
547
738
not affect opening plugins */
548
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
549
perror("fopen");
550
exitstatus = EXIT_FAILURE;
739
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
740
error(0, errno, "fopen");
741
exitstatus = EX_OSERR;
551
742
goto fallback;
552
743
}
553
744
}
554
/* If there was any arguments from configuration file,
555
pass them to parser as command arguments */
745
/* If there were any arguments from the configuration file, pass
746
them to parser as command line arguments */
556
747
if(custom_argv != NULL){
557
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
558
if (ret == ARGP_ERR_UNKNOWN){
559
fprintf(stderr, "Unknown error while parsing arguments\n");
560
exitstatus = EXIT_FAILURE;
561
goto fallback;
748
ret = argp_parse(&argp, custom_argc, custom_argv,
749
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
750
NULL, NULL);
751
switch(ret){
752
case 0:
753
break;
754
case ENOMEM:
755
default:
756
errno = ret;
757
error(0, errno, "argp_parse");
758
exitstatus = EX_OSERR;
759
goto fallback;
760
case EINVAL:
761
exitstatus = EX_CONFIG;
762
goto fallback;
763
}
764
}
765
766
/* Parse actual command line arguments, to let them override the
767
config file */
768
ret = argp_parse(&argp, argc, argv,
769
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
770
NULL, NULL);
771
switch(ret){
772
case 0:
773
break;
774
case ENOMEM:
775
default:
776
errno = ret;
777
error(0, errno, "argp_parse");
778
exitstatus = EX_OSERR;
779
goto fallback;
780
case EINVAL:
781
exitstatus = EX_USAGE;
782
goto fallback;
783
}
784
785
{
786
char *pluginhelperenv;
787
bool bret = true;
788
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
790
if(ret != -1){
791
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
792
}
793
if(ret == -1 or not bret){
794
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
795
" environment variable to \"%s\" for all plugins\n",
796
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
797
}
798
if(ret != -1){
799
free(pluginhelperenv);
562
800
}
563
801
}
564
802
565
803
if(debug){
566
for(plugin *p = plugin_list; p != NULL; p=p->next){
804
for(plugin *p = plugin_list; p != NULL; p = p->next){
567
805
fprintf(stderr, "Plugin: %s has %d arguments\n",
568
806
p->name ? p->name : "Global", p->argc - 1);
569
807
for(char **a = p->argv; *a != NULL; a++){
570
808
fprintf(stderr, "\tArg: %s\n", *a);
571
809
}
572
fprintf(stderr, "...and %u environment variables\n", p->envc);
810
fprintf(stderr, "...and %d environment variables\n", p->envc);
573
811
for(char **a = p->environ; *a != NULL; a++){
574
812
fprintf(stderr, "\t%s\n", *a);
575
813
}
576
814
}
577
815
}
578
579
/* Strip permissions down to nobody */
816
817
if(getuid() == 0){
818
/* Work around Debian bug #633582:
819
<https://bugs.debian.org/633582> */
820
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
821
if(plugindir_fd == -1){
822
if(errno != ENOENT){
823
error(0, errno, "open(\"" PDIR "\")");
824
}
825
} else {
826
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
827
if(ret == -1){
828
error(0, errno, "fstat");
829
} else {
830
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
831
ret = fchown(plugindir_fd, uid, gid);
832
if(ret == -1){
833
error(0, errno, "fchown");
834
}
835
}
836
}
837
close(plugindir_fd);
838
}
839
}
840
841
/* Lower permissions */
842
ret = setgid(gid);
843
if(ret == -1){
844
error(0, errno, "setgid");
845
}
580
846
ret = setuid(uid);
581
if (ret == -1){
582
perror("setuid");
583
}
584
setgid(gid);
585
if (ret == -1){
586
perror("setgid");
587
}
588
589
if (plugindir == NULL){
590
dir = opendir(PDIR);
591
} else {
592
dir = opendir(plugindir);
593
}
594
595
if(dir == NULL){
596
perror("Could not open plugin dir");
597
exitstatus = EXIT_FAILURE;
598
goto fallback;
599
}
600
601
/* Set the FD_CLOEXEC flag on the directory, if possible */
847
if(ret == -1){
848
error(0, errno, "setuid");
849
}
850
851
/* Open plugin directory with close_on_exec flag */
602
852
{
603
int dir_fd = dirfd(dir);
604
if(dir_fd >= 0){
605
ret = set_cloexec_flag(dir_fd);
606
if(ret < 0){
607
perror("set_cloexec_flag");
608
exitstatus = EXIT_FAILURE;
609
goto fallback;
853
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
854
#ifdef O_CLOEXEC
855
O_CLOEXEC
856
#else /* not O_CLOEXEC */
857
0
858
#endif /* not O_CLOEXEC */
859
);
860
if(dir_fd == -1){
861
error(0, errno, "Could not open plugin dir");
862
exitstatus = EX_UNAVAILABLE;
863
goto fallback;
864
}
865
866
#ifndef O_CLOEXEC
867
/* Set the FD_CLOEXEC flag on the directory */
868
ret = set_cloexec_flag(dir_fd);
869
if(ret < 0){
870
error(0, errno, "set_cloexec_flag");
871
exitstatus = EX_OSERR;
872
goto fallback;
873
}
874
#endif /* O_CLOEXEC */
875
}
876
877
int good_name(const struct dirent * const dirent){
878
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
879
"*.dpkg-old", "*.dpkg-bak",
880
"*.dpkg-divert", NULL };
881
#ifdef __GNUC__
882
#pragma GCC diagnostic push
883
#pragma GCC diagnostic ignored "-Wcast-qual"
884
#endif
885
for(const char **pat = (const char **)patterns;
886
*pat != NULL; pat++){
887
#ifdef __GNUC__
888
#pragma GCC diagnostic pop
889
#endif
890
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
891
!= FNM_NOMATCH){
892
if(debug){
893
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
894
" matching pattern %s\n", dirent->d_name, *pat);
895
}
896
return 0;
610
897
}
611
898
}
899
return 1;
900
}
901
902
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
903
alphasort);
904
if(numplugins == -1){
905
error(0, errno, "Could not scan plugin dir");
906
direntries = NULL;
907
exitstatus = EX_OSERR;
908
goto fallback;
612
909
}
613
910
614
911
FD_ZERO(&rfds_all);
615
912
616
913
/* Read and execute any executable in the plugin directory*/
617
while(true){
618
dirst = readdir(dir);
619
620
// All directory entries have been processed
621
if(dirst == NULL){
622
if (errno == EBADF){
623
perror("readdir");
624
exitstatus = EXIT_FAILURE;
625
goto fallback;
626
}
627
break;
628
}
629
630
d_name_len = strlen(dirst->d_name);
631
632
// Ignore dotfiles, backup files and other junk
633
{
634
bool bad_name = false;
635
636
const char const *bad_prefixes[] = { ".", "#", NULL };
637
638
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
639
".dpkg-old",
640
".dpkg-divert", NULL };
641
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
642
size_t pre_len = strlen(*pre);
643
if((d_name_len >= pre_len)
644
and strncmp((dirst->d_name), *pre, pre_len) == 0){
645
if(debug){
646
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
647
" with bad prefix %s\n", dirst->d_name, *pre);
648
}
649
bad_name = true;
650
break;
651
}
652
}
653
if(bad_name){
654
continue;
655
}
656
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
657
size_t suf_len = strlen(*suf);
658
if((d_name_len >= suf_len)
659
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
660
== 0)){
661
if(debug){
662
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
663
" with bad suffix %s\n", dirst->d_name, *suf);
664
}
665
bad_name = true;
666
break;
667
}
668
}
669
670
if(bad_name){
671
continue;
672
}
673
}
674
675
char *filename;
676
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
677
if(ret < 0){
678
perror("asprintf");
679
continue;
680
}
681
682
ret = stat(filename, &st);
683
if (ret == -1){
684
perror("stat");
685
free(filename);
686
continue;
687
}
688
914
for(int i = 0; i < numplugins; i++){
915
916
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
917
if(plugin_fd == -1){
918
error(0, errno, "Could not open plugin");
919
free(direntries[i]);
920
continue;
921
}
922
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
923
if(ret == -1){
924
error(0, errno, "stat");
925
close(plugin_fd);
926
free(direntries[i]);
927
continue;
928
}
929
689
930
/* Ignore non-executable files */
690
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
931
if(not S_ISREG(st.st_mode)
932
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
933
X_OK, 0)) != 0)){
691
934
if(debug){
692
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
693
" with bad type or mode\n", filename);
935
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
936
" with bad type or mode\n",
937
plugindir != NULL ? plugindir : PDIR,
938
direntries[i]->d_name);
694
939
}
695
free(filename);
940
close(plugin_fd);
941
free(direntries[i]);
696
942
continue;
697
943
}
698
944
699
plugin *p = getplugin(dirst->d_name);
945
plugin *p = getplugin(direntries[i]->d_name);
700
946
if(p == NULL){
701
perror("getplugin");
702
free(filename);
947
error(0, errno, "getplugin");
948
close(plugin_fd);
949
free(direntries[i]);
703
950
continue;
704
951
}
705
952
if(p->disabled){
706
953
if(debug){
707
954
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
708
dirst->d_name);
955
direntries[i]->d_name);
709
956
}
710
free(filename);
957
close(plugin_fd);
958
free(direntries[i]);
711
959
continue;
712
960
}
713
961
{
716
964
if(g != NULL){
717
965
for(char **a = g->argv + 1; *a != NULL; a++){
718
966
if(not add_argument(p, *a)){
719
perror("add_argument");
967
error(0, errno, "add_argument");
720
968
}
721
969
}
722
970
/* Add global environment variables */
723
971
for(char **e = g->environ; *e != NULL; e++){
724
if(not add_environment(p, *e)){
725
perror("add_environment");
972
if(not add_environment(p, *e, false)){
973
error(0, errno, "add_environment");
726
974
}
727
975
}
728
976
}
729
977
}
730
/* If this plugin has any environment variables, we will call
731
using execve and need to duplicate the environment from this
732
process, too. */
978
/* If this plugin has any environment variables, we need to
979
duplicate the environment from this process, too. */
733
980
if(p->environ[0] != NULL){
734
981
for(char **e = environ; *e != NULL; e++){
735
char *copy = strdup(*e);
736
if(copy == NULL){
737
perror("strdup");
738
continue;
739
}
740
if(not add_environment(p, copy)){
741
perror("add_environment");
982
if(not add_environment(p, *e, false)){
983
error(0, errno, "add_environment");
742
984
}
743
985
}
744
986
}
745
987
746
988
int pipefd[2];
747
ret = pipe(pipefd);
748
if (ret == -1){
749
perror("pipe");
750
exitstatus = EXIT_FAILURE;
751
goto fallback;
752
}
989
#ifndef O_CLOEXEC
990
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
991
#else /* O_CLOEXEC */
992
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
993
#endif /* O_CLOEXEC */
994
if(ret == -1){
995
error(0, errno, "pipe");
996
exitstatus = EX_OSERR;
997
free(direntries[i]);
998
goto fallback;
999
}
1000
if(pipefd[0] >= FD_SETSIZE){
1001
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1002
FD_SETSIZE);
1003
close(pipefd[0]);
1004
close(pipefd[1]);
1005
exitstatus = EX_OSERR;
1006
free(direntries[i]);
1007
goto fallback;
1008
}
1009
#ifndef O_CLOEXEC
753
1010
/* Ask OS to automatic close the pipe on exec */
754
1011
ret = set_cloexec_flag(pipefd[0]);
755
1012
if(ret < 0){
756
perror("set_cloexec_flag");
757
exitstatus = EXIT_FAILURE;
1013
error(0, errno, "set_cloexec_flag");
1014
close(pipefd[0]);
1015
close(pipefd[1]);
1016
exitstatus = EX_OSERR;
1017
free(direntries[i]);
758
1018
goto fallback;
759
1019
}
760
1020
ret = set_cloexec_flag(pipefd[1]);
761
1021
if(ret < 0){
762
perror("set_cloexec_flag");
763
exitstatus = EXIT_FAILURE;
1022
error(0, errno, "set_cloexec_flag");
1023
close(pipefd[0]);
1024
close(pipefd[1]);
1025
exitstatus = EX_OSERR;
1026
free(direntries[i]);
764
1027
goto fallback;
765
1028
}
1029
#endif /* not O_CLOEXEC */
766
1030
/* Block SIGCHLD until process is safely in process list */
767
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1031
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1032
&sigchld_action.sa_mask,
1033
NULL));
768
1034
if(ret < 0){
769
perror("sigprocmask");
770
exitstatus = EXIT_FAILURE;
1035
error(0, errno, "sigprocmask");
1036
exitstatus = EX_OSERR;
1037
free(direntries[i]);
771
1038
goto fallback;
772
1039
}
773
// Starting a new process to be watched
774
pid_t pid = fork();
1040
/* Starting a new process to be watched */
1041
pid_t pid;
1042
do {
1043
pid = fork();
1044
} while(pid == -1 and errno == EINTR);
775
1045
if(pid == -1){
776
perror("fork");
777
exitstatus = EXIT_FAILURE;
1046
error(0, errno, "fork");
1047
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1048
&sigchld_action.sa_mask, NULL));
1049
close(pipefd[0]);
1050
close(pipefd[1]);
1051
exitstatus = EX_OSERR;
1052
free(direntries[i]);
778
1053
goto fallback;
779
1054
}
780
1055
if(pid == 0){
781
1056
/* this is the child process */
782
1057
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
783
1058
if(ret < 0){
784
perror("sigaction");
785
_exit(EXIT_FAILURE);
1059
error(0, errno, "sigaction");
1060
_exit(EX_OSERR);
786
1061
}
787
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1062
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
788
1063
if(ret < 0){
789
perror("sigprocmask");
790
_exit(EXIT_FAILURE);
1064
error(0, errno, "sigprocmask");
1065
_exit(EX_OSERR);
791
1066
}
792
1067
793
1068
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
794
1069
if(ret == -1){
795
perror("dup2");
796
_exit(EXIT_FAILURE);
1070
error(0, errno, "dup2");
1071
_exit(EX_OSERR);
797
1072
}
798
1073
799
if(dirfd(dir) < 0){
800
/* If dir has no file descriptor, we could not set FD_CLOEXEC
801
above and must now close it manually here. */
802
closedir(dir);
803
}
804
if(p->environ[0] == NULL){
805
if(execv(filename, p->argv) < 0){
806
perror("execv");
807
_exit(EXIT_FAILURE);
808
}
809
} else {
810
if(execve(filename, p->argv, p->environ) < 0){
811
perror("execve");
812
_exit(EXIT_FAILURE);
813
}
1074
if(fexecve(plugin_fd, p->argv,
1075
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1076
error(0, errno, "fexecve for %s/%s",
1077
plugindir != NULL ? plugindir : PDIR,
1078
direntries[i]->d_name);
1079
_exit(EX_OSERR);
814
1080
}
815
1081
/* no return */
816
1082
}
817
1083
/* Parent process */
818
1084
close(pipefd[1]); /* Close unused write end of pipe */
819
free(filename);
820
plugin *new_plugin = getplugin(dirst->d_name);
821
if (new_plugin == NULL){
822
perror("getplugin");
823
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1085
close(plugin_fd);
1086
plugin *new_plugin = getplugin(direntries[i]->d_name);
1087
if(new_plugin == NULL){
1088
error(0, errno, "getplugin");
1089
ret = (int)(TEMP_FAILURE_RETRY
1090
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1091
NULL)));
824
1092
if(ret < 0){
825
perror("sigprocmask");
1093
error(0, errno, "sigprocmask");
826
1094
}
827
exitstatus = EXIT_FAILURE;
1095
exitstatus = EX_OSERR;
1096
free(direntries[i]);
828
1097
goto fallback;
829
1098
}
1099
free(direntries[i]);
830
1100
831
1101
new_plugin->pid = pid;
832
1102
new_plugin->fd = pipefd[0];
833
1103
1104
if(debug){
1105
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1106
new_plugin->name, (intmax_t) (new_plugin->pid));
1107
}
1108
834
1109
/* Unblock SIGCHLD so signal handler can be run if this process
835
1110
has already completed */
836
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1112
&sigchld_action.sa_mask,
1113
NULL));
837
1114
if(ret < 0){
838
perror("sigprocmask");
839
exitstatus = EXIT_FAILURE;
1115
error(0, errno, "sigprocmask");
1116
exitstatus = EX_OSERR;
840
1117
goto fallback;
841
1118
}
842
1119
843
1120
FD_SET(new_plugin->fd, &rfds_all);
844
1121
845
if (maxfd < new_plugin->fd){
1122
if(maxfd < new_plugin->fd){
846
1123
maxfd = new_plugin->fd;
847
1124
}
848
849
1125
}
850
1126
851
closedir(dir);
852
dir = NULL;
853
1127
free(direntries);
1128
direntries = NULL;
1129
close(dir_fd);
1130
dir_fd = -1;
1131
free_plugin(getplugin(NULL));
1132
854
1133
for(plugin *p = plugin_list; p != NULL; p = p->next){
855
1134
if(p->pid != 0){
856
1135
break;
861
1140
free_plugin_list();
862
1141
}
863
1142
}
864
1143
865
1144
/* Main loop while running plugins exist */
866
1145
while(plugin_list){
867
1146
fd_set rfds = rfds_all;
868
1147
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
869
if (select_ret == -1){
870
perror("select");
871
exitstatus = EXIT_FAILURE;
1148
if(select_ret == -1 and errno != EINTR){
1149
error(0, errno, "select");
1150
exitstatus = EX_OSERR;
872
1151
goto fallback;
873
1152
}
874
1153
/* OK, now either a process completed, or something can be read
875
1154
from one of them */
876
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1155
for(plugin *proc = plugin_list; proc != NULL;){
877
1156
/* Is this process completely done? */
878
if(proc->eof and proc->completed){
1157
if(proc->completed and proc->eof){
879
1158
/* Only accept the plugin output if it exited cleanly */
880
1159
if(not WIFEXITED(proc->status)
881
1160
or WEXITSTATUS(proc->status) != 0){
882
1161
/* Bad exit by plugin */
883
1162
884
1163
if(debug){
885
1164
if(WIFEXITED(proc->status)){
886
fprintf(stderr, "Plugin %u exited with status %d\n",
887
(unsigned int) (proc->pid),
1165
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1166
" status %d\n", proc->name,
1167
(intmax_t) (proc->pid),
888
1168
WEXITSTATUS(proc->status));
889
} else if(WIFSIGNALED(proc->status)) {
890
fprintf(stderr, "Plugin %u killed by signal %d\n",
891
(unsigned int) (proc->pid),
892
WTERMSIG(proc->status));
893
} else if(WCOREDUMP(proc->status)){
894
fprintf(stderr, "Plugin %d dumped core\n",
895
(unsigned int) (proc->pid));
1169
} else if(WIFSIGNALED(proc->status)){
1170
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1171
" signal %d: %s\n", proc->name,
1172
(intmax_t) (proc->pid),
1173
WTERMSIG(proc->status),
1174
strsignal(WTERMSIG(proc->status)));
896
1175
}
897
1176
}
898
1177
899
1178
/* Remove the plugin */
900
1179
FD_CLR(proc->fd, &rfds_all);
901
1180
902
1181
/* Block signal while modifying process_list */
903
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1182
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1183
(SIG_BLOCK,
1184
&sigchld_action.sa_mask,
1185
NULL));
904
1186
if(ret < 0){
905
perror("sigprocmask");
906
exitstatus = EXIT_FAILURE;
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
907
1189
goto fallback;
908
1190
}
1191
1192
plugin *next_plugin = proc->next;
909
1193
free_plugin(proc);
1194
proc = next_plugin;
1195
910
1196
/* We are done modifying process list, so unblock signal */
911
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
912
NULL);
1197
ret = (int)(TEMP_FAILURE_RETRY
1198
(sigprocmask(SIG_UNBLOCK,
1199
&sigchld_action.sa_mask, NULL)));
913
1200
if(ret < 0){
914
perror("sigprocmask");
915
exitstatus = EXIT_FAILURE;
1201
error(0, errno, "sigprocmask");
1202
exitstatus = EX_OSERR;
916
1203
goto fallback;
917
1204
}
918
1205
919
1206
if(plugin_list == NULL){
920
1207
break;
921
1208
}
1209
922
1210
continue;
923
1211
}
924
1212
925
1213
/* This process exited nicely, so print its buffer */
926
1214
927
1215
bool bret = print_out_password(proc->buffer,
928
1216
proc->buffer_length);
929
1217
if(not bret){
930
perror("print_out_password");
931
exitstatus = EXIT_FAILURE;
1218
error(0, errno, "print_out_password");
1219
exitstatus = EX_IOERR;
932
1220
}
933
1221
goto fallback;
934
1222
}
936
1224
/* This process has not completed. Does it have any output? */
937
1225
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
938
1226
/* This process had nothing to say at this time */
1227
proc = proc->next;
939
1228
continue;
940
1229
}
941
1230
/* Before reading, make the process' data buffer large enough */
942
1231
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
943
proc->buffer = realloc(proc->buffer, proc->buffer_size
944
+ (size_t) BUFFER_SIZE);
945
if (proc->buffer == NULL){
946
perror("malloc");
947
exitstatus = EXIT_FAILURE;
1232
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1233
+ (size_t) BUFFER_SIZE);
1234
if(new_buffer == NULL){
1235
error(0, errno, "malloc");
1236
exitstatus = EX_OSERR;
948
1237
goto fallback;
949
1238
}
1239
proc->buffer = new_buffer;
950
1240
proc->buffer_size += BUFFER_SIZE;
951
1241
}
952
1242
/* Read from the process */
953
ret = read(proc->fd, proc->buffer + proc->buffer_length,
954
BUFFER_SIZE);
955
if(ret < 0){
1243
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1244
proc->buffer
1245
+ proc->buffer_length,
1246
BUFFER_SIZE));
1247
if(sret < 0){
956
1248
/* Read error from this process; ignore the error */
1249
proc = proc->next;
957
1250
continue;
958
1251
}
959
if(ret == 0){
1252
if(sret == 0){
960
1253
/* got EOF */
961
1254
proc->eof = true;
962
1255
} else {
963
proc->buffer_length += (size_t) ret;
1256
proc->buffer_length += (size_t) sret;
964
1257
}
965
1258
}
966
1259
}
967
968
1260
1261
969
1262
fallback:
970
1263
971
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1264
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1265
and exitstatus != EX_OK)){
972
1266
/* Fallback if all plugins failed, none are found or an error
973
1267
occured */
974
1268
bool bret;
975
1269
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
976
1270
char *passwordbuffer = getpass("Password: ");
977
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1271
size_t len = strlen(passwordbuffer);
1272
/* Strip trailing newline */
1273
if(len > 0 and passwordbuffer[len-1] == '\n'){
1274
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1275
len--;
1276
}
1277
bret = print_out_password(passwordbuffer, len);
978
1278
if(not bret){
979
perror("print_out_password");
980
exitstatus = EXIT_FAILURE;
1279
error(0, errno, "print_out_password");
1280
exitstatus = EX_IOERR;
981
1281
}
982
1282
}
983
1283
984
1284
/* Restore old signal handler */
985
1285
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
986
1286
if(ret == -1){
987
perror("sigaction");
988
exitstatus = EXIT_FAILURE;
1287
error(0, errno, "sigaction");
1288
exitstatus = EX_OSERR;
989
1289
}
990
1290
991
1291
if(custom_argv != NULL){
992
1292
for(char **arg = custom_argv+1; *arg != NULL; arg++){
993
1293
free(*arg);
995
1295
free(custom_argv);
996
1296
}
997
1297
998
if(dir != NULL){
999
closedir(dir);
1298
free(direntries);
1299
1300
if(dir_fd != -1){
1301
close(dir_fd);
1000
1302
}
1001
1303
1002
/* Free the process list and kill the processes */
1304
/* Kill the processes */
1003
1305
for(plugin *p = plugin_list; p != NULL; p = p->next){
1004
1306
if(p->pid != 0){
1005
1307
close(p->fd);
1006
1308
ret = kill(p->pid, SIGTERM);
1007
1309
if(ret == -1 and errno != ESRCH){
1008
1310
/* Set-uid proccesses might not get closed */
1009
perror("kill");
1311
error(0, errno, "kill");
1010
1312
}
1011
1313
}
1012
1314
}
1013
1315
1014
1316
/* Wait for any remaining child processes to terminate */
1015
do{
1317
do {
1016
1318
ret = wait(NULL);
1017
1319
} while(ret >= 0);
1018
1320
if(errno != ECHILD){
1019
perror("wait");
1321
error(0, errno, "wait");
1020
1322
}
1021
1323
1022
1324
free_plugin_list();
1023
1325
1024
1326
free(plugindir);
1327
free(pluginhelperdir);
1025
1328
free(argfile);
1026
1329
1027
1330
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0