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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
156
136
new_plugin->environ = malloc(sizeof(char *));
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;
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
}
186
221
/* namelen = length of name of environment variable */
187
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
223
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
191
/* Refuse to add an existing 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
}
192
238
return true;
193
239
}
194
240
}
195
241
return add_to_char_array(def, &(p->environ), &(p->envc));
196
242
}
197
243
244
#ifndef O_CLOEXEC
198
245
/*
199
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
200
247
* Descriptor Flags".
201
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
202
249
*/
203
static int set_cloexec_flag(int fd)
204
{
205
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));
206
253
/* If reading the flags failed, return error indication now. */
207
254
if(ret < 0){
208
255
return ret;
209
256
}
210
257
/* Store modified flag word in the descriptor. */
211
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
212
260
}
261
#endif /* not O_CLOEXEC */
213
262
214
263
215
264
/* Mark processes as completed when they exit, and save their exit
216
265
status. */
217
void handle_sigchld(__attribute__((unused)) int sig){
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
218
268
while(true){
219
269
plugin *proc = plugin_list;
220
270
int status;
224
274
break;
225
275
}
226
276
if(pid == -1){
227
if (errno != ECHILD){
228
perror("waitpid");
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
229
280
}
230
/* No child processes */
231
break;
281
error(0, errno, "waitpid");
232
282
}
233
283
234
284
/* A child exited, find it in process_list */
235
285
while(proc != NULL and proc->pid != pid){
236
286
proc = proc->next;
240
290
continue;
241
291
}
242
292
proc->status = status;
243
proc->completed = true;
293
proc->completed = 1;
244
294
}
295
errno = old_errno;
245
296
}
246
297
247
298
/* Prints out a password to stdout */
248
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){
249
301
ssize_t ret;
250
if(length>0 and buffer[length-1] == '\n'){
251
length--;
252
}
253
302
for(size_t written = 0; written < length; written += (size_t)ret){
254
303
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
255
304
length - written));
261
310
}
262
311
263
312
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
264
314
static void free_plugin(plugin *plugin_node){
265
315
266
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
316
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
267
317
free(*arg);
268
318
}
319
free(plugin_node->name);
269
320
free(plugin_node->argv);
270
321
for(char **env = plugin_node->environ; *env != NULL; env++){
271
322
free(*env);
272
323
}
273
324
free(plugin_node->environ);
274
325
free(plugin_node->buffer);
275
326
276
327
/* Removes the plugin from the singly-linked list */
277
328
if(plugin_node == plugin_list){
278
329
/* First one - simple */
298
349
299
350
int main(int argc, char *argv[]){
300
351
char *plugindir = NULL;
352
char *pluginhelperdir = NULL;
301
353
char *argfile = NULL;
302
354
FILE *conffp;
303
size_t d_name_len;
304
DIR *dir = NULL;
305
struct dirent *dirst;
355
struct dirent **direntries = NULL;
306
356
struct stat st;
307
357
fd_set rfds_all;
308
358
int ret, maxfd = 0;
359
ssize_t sret;
309
360
uid_t uid = 65534;
310
361
gid_t gid = 65534;
311
362
bool debug = false;
315
366
.sa_flags = SA_NOCLDSTOP };
316
367
char **custom_argv = NULL;
317
368
int custom_argc = 0;
369
int dir_fd = -1;
318
370
319
371
/* Establish a signal handler */
320
372
sigemptyset(&sigchld_action.sa_mask);
321
373
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
322
374
if(ret == -1){
323
perror("sigaddset");
324
exitstatus = EXIT_FAILURE;
375
error(0, errno, "sigaddset");
376
exitstatus = EX_OSERR;
325
377
goto fallback;
326
378
}
327
379
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
328
380
if(ret == -1){
329
perror("sigaction");
330
exitstatus = EXIT_FAILURE;
381
error(0, errno, "sigaction");
382
exitstatus = EX_OSERR;
331
383
goto fallback;
332
384
}
333
385
336
388
{ .name = "global-options", .key = 'g',
337
389
.arg = "OPTION[,OPTION[,...]]",
338
390
.doc = "Options passed to all plugins" },
339
{ .name = "global-env", .key = 'e',
391
{ .name = "global-env", .key = 'G',
340
392
.arg = "VAR=value",
341
393
.doc = "Environment variable passed to all plugins" },
342
394
{ .name = "options-for", .key = 'o',
343
395
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
344
396
.doc = "Options passed only to specified plugin" },
345
{ .name = "env-for", .key = 'f',
397
{ .name = "env-for", .key = 'E',
346
398
.arg = "PLUGIN:ENV=value",
347
399
.doc = "Environment variable passed to specified plugin" },
348
400
{ .name = "disable", .key = 'd',
349
401
.arg = "PLUGIN",
350
402
.doc = "Disable a specific plugin", .group = 1 },
403
{ .name = "enable", .key = 'e',
404
.arg = "PLUGIN",
405
.doc = "Enable a specific plugin", .group = 1 },
351
406
{ .name = "plugin-dir", .key = 128,
352
407
.arg = "DIRECTORY",
353
408
.doc = "Specify a different plugin directory", .group = 2 },
362
417
.doc = "Group ID the plugins will run as", .group = 3 },
363
418
{ .name = "debug", .key = 132,
364
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 },
365
433
{ .name = NULL }
366
434
};
367
435
368
error_t parse_opt (int key, char *arg, __attribute__((unused))
369
struct argp_state *state) {
370
/* Get the INPUT argument from `argp_parse', which we know is a
371
pointer to our plugin list pointer. */
372
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;
373
442
case 'g': /* --global-options */
374
if (arg != NULL){
375
char *p;
376
while((p = strsep(&arg, ",")) != NULL){
377
if(p[0] == '\0'){
378
continue;
379
}
380
if(not add_argument(getplugin(NULL), p)){
381
perror("add_argument");
382
return ARGP_ERR_UNKNOWN;
383
}
384
}
385
}
386
break;
387
case 'e': /* --global-env */
388
if(arg == NULL){
389
break;
390
}
391
443
{
392
char *envdef = strdup(arg);
393
if(envdef == NULL){
394
break;
395
}
396
if(not add_environment(getplugin(NULL), envdef)){
397
perror("add_environment");
398
}
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;
399
456
}
400
457
break;
401
458
case 'o': /* --options-for */
402
if (arg != NULL){
403
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0'){
405
break;
406
}
407
char *opt = strsep(&arg, ":");
408
if(opt[0] == '\0'){
409
break;
410
}
411
if(opt != NULL){
412
char *p;
413
while((p = strsep(&opt, ",")) != NULL){
414
if(p[0] == '\0'){
415
continue;
416
}
417
if(not add_argument(getplugin(p_name), p)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
420
}
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;
421
477
}
422
478
}
479
errno = 0;
423
480
}
424
481
break;
425
case 'f': /* --env-for */
426
if(arg == NULL){
427
break;
428
}
482
case 'E': /* --env-for */
429
483
{
430
484
char *envdef = strchr(arg, ':');
431
485
if(envdef == NULL){
432
break;
433
}
434
char *p_name = strndup(arg, (size_t) (envdef-arg));
435
if(p_name == NULL){
436
break;
437
}
486
argp_error(state, "No colon in \"%s\"", arg);
487
errno = EINVAL;
488
break;
489
}
490
*envdef = '\0';
438
491
envdef++;
439
if(not add_environment(getplugin(p_name), envdef)){
440
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;
441
499
}
442
500
}
443
501
break;
444
502
case 'd': /* --disable */
445
if (arg != NULL){
446
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
449
}
450
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
}
451
518
}
452
519
break;
453
520
case 128: /* --plugin-dir */
521
free(plugindir);
454
522
plugindir = strdup(arg);
455
if(plugindir == NULL){
456
perror("strdup");
457
}
458
break;
459
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);
460
617
argfile = strdup(arg);
461
if(argfile == NULL){
462
perror("strdup");
618
if(argfile != NULL){
619
errno = 0;
463
620
}
464
break;
621
break;
465
622
case 130: /* --userid */
466
uid = (uid_t)strtol(arg, NULL, 10);
467
break;
468
623
case 131: /* --groupid */
469
gid = (gid_t)strtol(arg, NULL, 10);
470
break;
471
624
case 132: /* --debug */
472
debug = true;
473
break;
625
case 133: /* --plugin-helper-dir */
626
case '?': /* --help */
627
case -3: /* --usage */
628
case 'V': /* --version */
474
629
case ARGP_KEY_ARG:
475
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
476
break;
477
case ARGP_KEY_END:
478
630
break;
479
631
default:
480
632
return ARGP_ERR_UNKNOWN;
481
633
}
482
return 0;
634
return errno;
483
635
}
484
636
485
struct argp argp = { .options = options, .parser = parse_opt,
486
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
637
struct argp argp = { .options = options,
638
.parser = parse_opt_config_file,
639
.args_doc = "",
487
640
.doc = "Mandos plugin runner -- Run plugins" };
488
641
489
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
490
if (ret == ARGP_ERR_UNKNOWN){
491
fprintf(stderr, "Unknown error while parsing arguments\n");
492
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;
493
658
goto fallback;
494
659
}
495
496
/* Opens the configfile if aviable */
497
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){
498
666
conffp = fopen(AFILE, "r");
499
667
} else {
500
668
conffp = fopen(argfile, "r");
501
}
669
}
502
670
if(conffp != NULL){
503
671
char *org_line = NULL;
504
672
char *p, *arg, *new_arg, *line;
505
673
size_t size = 0;
506
ssize_t sret;
507
674
const char whitespace_delims[] = " \r\t\f\v\n";
508
675
const char comment_delim[] = "#";
509
676
510
677
custom_argc = 1;
511
678
custom_argv = malloc(sizeof(char*) * 2);
512
679
if(custom_argv == NULL){
513
perror("malloc");
514
exitstatus = EXIT_FAILURE;
680
error(0, errno, "malloc");
681
exitstatus = EX_OSERR;
515
682
goto fallback;
516
683
}
517
684
custom_argv[0] = argv[0];
518
685
custom_argv[1] = NULL;
519
686
520
687
/* for each line in the config file, strip whitespace and ignore
521
688
commented text */
522
689
while(true){
524
691
if(sret == -1){
525
692
break;
526
693
}
527
694
528
695
line = org_line;
529
696
arg = strsep(&line, comment_delim);
530
697
while((p = strsep(&arg, whitespace_delims)) != NULL){
533
700
}
534
701
new_arg = strdup(p);
535
702
if(new_arg == NULL){
536
perror("strdup");
537
exitstatus = EXIT_FAILURE;
703
error(0, errno, "strdup");
704
exitstatus = EX_OSERR;
538
705
free(org_line);
539
706
goto fallback;
540
707
}
541
708
542
709
custom_argc += 1;
543
custom_argv = realloc(custom_argv, sizeof(char *)
544
* ((unsigned int) custom_argc + 1));
545
if(custom_argv == NULL){
546
perror("realloc");
547
exitstatus = EXIT_FAILURE;
548
free(org_line);
549
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
}
550
722
}
551
723
custom_argv[custom_argc-1] = new_arg;
552
custom_argv[custom_argc] = NULL;
724
custom_argv[custom_argc] = NULL;
553
725
}
554
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
}
555
735
free(org_line);
556
} else{
736
} else {
557
737
/* Check for harmful errors and go to fallback. Other errors might
558
738
not affect opening plugins */
559
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
560
perror("fopen");
561
exitstatus = EXIT_FAILURE;
739
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
740
error(0, errno, "fopen");
741
exitstatus = EX_OSERR;
562
742
goto fallback;
563
743
}
564
744
}
565
/* If there was any arguments from configuration file,
566
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 */
567
747
if(custom_argv != NULL){
568
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
569
if (ret == ARGP_ERR_UNKNOWN){
570
fprintf(stderr, "Unknown error while parsing arguments\n");
571
exitstatus = EXIT_FAILURE;
572
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);
573
800
}
574
801
}
575
802
576
803
if(debug){
577
for(plugin *p = plugin_list; p != NULL; p=p->next){
804
for(plugin *p = plugin_list; p != NULL; p = p->next){
578
805
fprintf(stderr, "Plugin: %s has %d arguments\n",
579
806
p->name ? p->name : "Global", p->argc - 1);
580
807
for(char **a = p->argv; *a != NULL; a++){
581
808
fprintf(stderr, "\tArg: %s\n", *a);
582
809
}
583
fprintf(stderr, "...and %u environment variables\n", p->envc);
810
fprintf(stderr, "...and %d environment variables\n", p->envc);
584
811
for(char **a = p->environ; *a != NULL; a++){
585
812
fprintf(stderr, "\t%s\n", *a);
586
813
}
587
814
}
588
815
}
589
590
/* 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
}
591
846
ret = setuid(uid);
592
if (ret == -1){
593
perror("setuid");
594
}
595
setgid(gid);
596
if (ret == -1){
597
perror("setgid");
598
}
599
600
if (plugindir == NULL){
601
dir = opendir(PDIR);
602
} else {
603
dir = opendir(plugindir);
604
}
605
606
if(dir == NULL){
607
perror("Could not open plugin dir");
608
exitstatus = EXIT_FAILURE;
609
goto fallback;
610
}
611
612
/* 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 */
613
852
{
614
int dir_fd = dirfd(dir);
615
if(dir_fd >= 0){
616
ret = set_cloexec_flag(dir_fd);
617
if(ret < 0){
618
perror("set_cloexec_flag");
619
exitstatus = EXIT_FAILURE;
620
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;
621
897
}
622
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;
623
909
}
624
910
625
911
FD_ZERO(&rfds_all);
626
912
627
913
/* Read and execute any executable in the plugin directory*/
628
while(true){
629
dirst = readdir(dir);
630
631
// All directory entries have been processed
632
if(dirst == NULL){
633
if (errno == EBADF){
634
perror("readdir");
635
exitstatus = EXIT_FAILURE;
636
goto fallback;
637
}
638
break;
639
}
640
641
d_name_len = strlen(dirst->d_name);
642
643
// Ignore dotfiles, backup files and other junk
644
{
645
bool bad_name = false;
646
647
const char const *bad_prefixes[] = { ".", "#", NULL };
648
649
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
650
".dpkg-old",
651
".dpkg-divert", NULL };
652
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
653
size_t pre_len = strlen(*pre);
654
if((d_name_len >= pre_len)
655
and strncmp((dirst->d_name), *pre, pre_len) == 0){
656
if(debug){
657
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
658
" with bad prefix %s\n", dirst->d_name, *pre);
659
}
660
bad_name = true;
661
break;
662
}
663
}
664
if(bad_name){
665
continue;
666
}
667
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
668
size_t suf_len = strlen(*suf);
669
if((d_name_len >= suf_len)
670
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
671
== 0)){
672
if(debug){
673
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
674
" with bad suffix %s\n", dirst->d_name, *suf);
675
}
676
bad_name = true;
677
break;
678
}
679
}
680
681
if(bad_name){
682
continue;
683
}
684
}
685
686
char *filename;
687
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
688
if(ret < 0){
689
perror("asprintf");
690
continue;
691
}
692
693
ret = stat(filename, &st);
694
if (ret == -1){
695
perror("stat");
696
free(filename);
697
continue;
698
}
699
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
700
930
/* Ignore non-executable files */
701
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)){
702
934
if(debug){
703
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
704
" 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);
705
939
}
706
free(filename);
940
close(plugin_fd);
941
free(direntries[i]);
707
942
continue;
708
943
}
709
944
710
plugin *p = getplugin(dirst->d_name);
945
plugin *p = getplugin(direntries[i]->d_name);
711
946
if(p == NULL){
712
perror("getplugin");
713
free(filename);
947
error(0, errno, "getplugin");
948
close(plugin_fd);
949
free(direntries[i]);
714
950
continue;
715
951
}
716
952
if(p->disabled){
717
953
if(debug){
718
954
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
719
dirst->d_name);
955
direntries[i]->d_name);
720
956
}
721
free(filename);
957
close(plugin_fd);
958
free(direntries[i]);
722
959
continue;
723
960
}
724
961
{
727
964
if(g != NULL){
728
965
for(char **a = g->argv + 1; *a != NULL; a++){
729
966
if(not add_argument(p, *a)){
730
perror("add_argument");
967
error(0, errno, "add_argument");
731
968
}
732
969
}
733
970
/* Add global environment variables */
734
971
for(char **e = g->environ; *e != NULL; e++){
735
if(not add_environment(p, *e)){
736
perror("add_environment");
972
if(not add_environment(p, *e, false)){
973
error(0, errno, "add_environment");
737
974
}
738
975
}
739
976
}
740
977
}
741
/* If this plugin has any environment variables, we will call
742
using execve and need to duplicate the environment from this
743
process, too. */
978
/* If this plugin has any environment variables, we need to
979
duplicate the environment from this process, too. */
744
980
if(p->environ[0] != NULL){
745
981
for(char **e = environ; *e != NULL; e++){
746
char *copy = strdup(*e);
747
if(copy == NULL){
748
perror("strdup");
749
continue;
750
}
751
if(not add_environment(p, copy)){
752
perror("add_environment");
982
if(not add_environment(p, *e, false)){
983
error(0, errno, "add_environment");
753
984
}
754
985
}
755
986
}
756
987
757
988
int pipefd[2];
758
ret = pipe(pipefd);
759
if (ret == -1){
760
perror("pipe");
761
exitstatus = EXIT_FAILURE;
762
goto fallback;
763
}
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
764
1010
/* Ask OS to automatic close the pipe on exec */
765
1011
ret = set_cloexec_flag(pipefd[0]);
766
1012
if(ret < 0){
767
perror("set_cloexec_flag");
768
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]);
769
1018
goto fallback;
770
1019
}
771
1020
ret = set_cloexec_flag(pipefd[1]);
772
1021
if(ret < 0){
773
perror("set_cloexec_flag");
774
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]);
775
1027
goto fallback;
776
1028
}
1029
#endif /* not O_CLOEXEC */
777
1030
/* Block SIGCHLD until process is safely in process list */
778
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));
779
1034
if(ret < 0){
780
perror("sigprocmask");
781
exitstatus = EXIT_FAILURE;
1035
error(0, errno, "sigprocmask");
1036
exitstatus = EX_OSERR;
1037
free(direntries[i]);
782
1038
goto fallback;
783
1039
}
784
// Starting a new process to be watched
785
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);
786
1045
if(pid == -1){
787
perror("fork");
788
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]);
789
1053
goto fallback;
790
1054
}
791
1055
if(pid == 0){
792
1056
/* this is the child process */
793
1057
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
794
1058
if(ret < 0){
795
perror("sigaction");
796
_exit(EXIT_FAILURE);
1059
error(0, errno, "sigaction");
1060
_exit(EX_OSERR);
797
1061
}
798
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1062
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
799
1063
if(ret < 0){
800
perror("sigprocmask");
801
_exit(EXIT_FAILURE);
1064
error(0, errno, "sigprocmask");
1065
_exit(EX_OSERR);
802
1066
}
803
1067
804
1068
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
805
1069
if(ret == -1){
806
perror("dup2");
807
_exit(EXIT_FAILURE);
1070
error(0, errno, "dup2");
1071
_exit(EX_OSERR);
808
1072
}
809
1073
810
if(dirfd(dir) < 0){
811
/* If dir has no file descriptor, we could not set FD_CLOEXEC
812
above and must now close it manually here. */
813
closedir(dir);
814
}
815
if(p->environ[0] == NULL){
816
if(execv(filename, p->argv) < 0){
817
perror("execv");
818
_exit(EXIT_FAILURE);
819
}
820
} else {
821
if(execve(filename, p->argv, p->environ) < 0){
822
perror("execve");
823
_exit(EXIT_FAILURE);
824
}
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);
825
1080
}
826
1081
/* no return */
827
1082
}
828
1083
/* Parent process */
829
1084
close(pipefd[1]); /* Close unused write end of pipe */
830
free(filename);
831
plugin *new_plugin = getplugin(dirst->d_name);
832
if (new_plugin == NULL){
833
perror("getplugin");
834
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)));
835
1092
if(ret < 0){
836
perror("sigprocmask");
1093
error(0, errno, "sigprocmask");
837
1094
}
838
exitstatus = EXIT_FAILURE;
1095
exitstatus = EX_OSERR;
1096
free(direntries[i]);
839
1097
goto fallback;
840
1098
}
1099
free(direntries[i]);
841
1100
842
1101
new_plugin->pid = pid;
843
1102
new_plugin->fd = pipefd[0];
844
1103
1104
if(debug){
1105
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1106
new_plugin->name, (intmax_t) (new_plugin->pid));
1107
}
1108
845
1109
/* Unblock SIGCHLD so signal handler can be run if this process
846
1110
has already completed */
847
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));
848
1114
if(ret < 0){
849
perror("sigprocmask");
850
exitstatus = EXIT_FAILURE;
1115
error(0, errno, "sigprocmask");
1116
exitstatus = EX_OSERR;
851
1117
goto fallback;
852
1118
}
853
1119
854
1120
FD_SET(new_plugin->fd, &rfds_all);
855
1121
856
if (maxfd < new_plugin->fd){
1122
if(maxfd < new_plugin->fd){
857
1123
maxfd = new_plugin->fd;
858
1124
}
859
860
1125
}
861
1126
862
closedir(dir);
863
dir = NULL;
864
1127
free(direntries);
1128
direntries = NULL;
1129
close(dir_fd);
1130
dir_fd = -1;
1131
free_plugin(getplugin(NULL));
1132
865
1133
for(plugin *p = plugin_list; p != NULL; p = p->next){
866
1134
if(p->pid != 0){
867
1135
break;
872
1140
free_plugin_list();
873
1141
}
874
1142
}
875
1143
876
1144
/* Main loop while running plugins exist */
877
1145
while(plugin_list){
878
1146
fd_set rfds = rfds_all;
879
1147
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
880
if (select_ret == -1){
881
perror("select");
882
exitstatus = EXIT_FAILURE;
1148
if(select_ret == -1 and errno != EINTR){
1149
error(0, errno, "select");
1150
exitstatus = EX_OSERR;
883
1151
goto fallback;
884
1152
}
885
1153
/* OK, now either a process completed, or something can be read
886
1154
from one of them */
887
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1155
for(plugin *proc = plugin_list; proc != NULL;){
888
1156
/* Is this process completely done? */
889
if(proc->eof and proc->completed){
1157
if(proc->completed and proc->eof){
890
1158
/* Only accept the plugin output if it exited cleanly */
891
1159
if(not WIFEXITED(proc->status)
892
1160
or WEXITSTATUS(proc->status) != 0){
893
1161
/* Bad exit by plugin */
894
1162
895
1163
if(debug){
896
1164
if(WIFEXITED(proc->status)){
897
fprintf(stderr, "Plugin %u exited with status %d\n",
898
(unsigned int) (proc->pid),
1165
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1166
" status %d\n", proc->name,
1167
(intmax_t) (proc->pid),
899
1168
WEXITSTATUS(proc->status));
900
} else if(WIFSIGNALED(proc->status)) {
901
fprintf(stderr, "Plugin %u killed by signal %d\n",
902
(unsigned int) (proc->pid),
903
WTERMSIG(proc->status));
904
} else if(WCOREDUMP(proc->status)){
905
fprintf(stderr, "Plugin %d dumped core\n",
906
(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)));
907
1175
}
908
1176
}
909
1177
910
1178
/* Remove the plugin */
911
1179
FD_CLR(proc->fd, &rfds_all);
912
1180
913
1181
/* Block signal while modifying process_list */
914
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));
915
1186
if(ret < 0){
916
perror("sigprocmask");
917
exitstatus = EXIT_FAILURE;
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
918
1189
goto fallback;
919
1190
}
1191
1192
plugin *next_plugin = proc->next;
920
1193
free_plugin(proc);
1194
proc = next_plugin;
1195
921
1196
/* We are done modifying process list, so unblock signal */
922
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
923
NULL);
1197
ret = (int)(TEMP_FAILURE_RETRY
1198
(sigprocmask(SIG_UNBLOCK,
1199
&sigchld_action.sa_mask, NULL)));
924
1200
if(ret < 0){
925
perror("sigprocmask");
926
exitstatus = EXIT_FAILURE;
1201
error(0, errno, "sigprocmask");
1202
exitstatus = EX_OSERR;
927
1203
goto fallback;
928
1204
}
929
1205
930
1206
if(plugin_list == NULL){
931
1207
break;
932
1208
}
1209
933
1210
continue;
934
1211
}
935
1212
936
1213
/* This process exited nicely, so print its buffer */
937
1214
938
1215
bool bret = print_out_password(proc->buffer,
939
1216
proc->buffer_length);
940
1217
if(not bret){
941
perror("print_out_password");
942
exitstatus = EXIT_FAILURE;
1218
error(0, errno, "print_out_password");
1219
exitstatus = EX_IOERR;
943
1220
}
944
1221
goto fallback;
945
1222
}
947
1224
/* This process has not completed. Does it have any output? */
948
1225
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
949
1226
/* This process had nothing to say at this time */
1227
proc = proc->next;
950
1228
continue;
951
1229
}
952
1230
/* Before reading, make the process' data buffer large enough */
953
1231
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
954
proc->buffer = realloc(proc->buffer, proc->buffer_size
955
+ (size_t) BUFFER_SIZE);
956
if (proc->buffer == NULL){
957
perror("malloc");
958
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;
959
1237
goto fallback;
960
1238
}
1239
proc->buffer = new_buffer;
961
1240
proc->buffer_size += BUFFER_SIZE;
962
1241
}
963
1242
/* Read from the process */
964
ret = read(proc->fd, proc->buffer + proc->buffer_length,
965
BUFFER_SIZE);
966
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){
967
1248
/* Read error from this process; ignore the error */
1249
proc = proc->next;
968
1250
continue;
969
1251
}
970
if(ret == 0){
1252
if(sret == 0){
971
1253
/* got EOF */
972
1254
proc->eof = true;
973
1255
} else {
974
proc->buffer_length += (size_t) ret;
1256
proc->buffer_length += (size_t) sret;
975
1257
}
976
1258
}
977
1259
}
978
979
1260
1261
980
1262
fallback:
981
1263
982
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1264
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1265
and exitstatus != EX_OK)){
983
1266
/* Fallback if all plugins failed, none are found or an error
984
1267
occured */
985
1268
bool bret;
986
1269
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
987
1270
char *passwordbuffer = getpass("Password: ");
988
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);
989
1278
if(not bret){
990
perror("print_out_password");
991
exitstatus = EXIT_FAILURE;
1279
error(0, errno, "print_out_password");
1280
exitstatus = EX_IOERR;
992
1281
}
993
1282
}
994
1283
995
1284
/* Restore old signal handler */
996
1285
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
997
1286
if(ret == -1){
998
perror("sigaction");
999
exitstatus = EXIT_FAILURE;
1287
error(0, errno, "sigaction");
1288
exitstatus = EX_OSERR;
1000
1289
}
1001
1290
1002
1291
if(custom_argv != NULL){
1003
1292
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1004
1293
free(*arg);
1006
1295
free(custom_argv);
1007
1296
}
1008
1297
1009
if(dir != NULL){
1010
closedir(dir);
1298
free(direntries);
1299
1300
if(dir_fd != -1){
1301
close(dir_fd);
1011
1302
}
1012
1303
1013
/* Free the process list and kill the processes */
1304
/* Kill the processes */
1014
1305
for(plugin *p = plugin_list; p != NULL; p = p->next){
1015
1306
if(p->pid != 0){
1016
1307
close(p->fd);
1017
1308
ret = kill(p->pid, SIGTERM);
1018
1309
if(ret == -1 and errno != ESRCH){
1019
1310
/* Set-uid proccesses might not get closed */
1020
perror("kill");
1311
error(0, errno, "kill");
1021
1312
}
1022
1313
}
1023
1314
}
1024
1315
1025
1316
/* Wait for any remaining child processes to terminate */
1026
do{
1317
do {
1027
1318
ret = wait(NULL);
1028
1319
} while(ret >= 0);
1029
1320
if(errno != ECHILD){
1030
perror("wait");
1321
error(0, errno, "wait");
1031
1322
}
1032
1323
1033
1324
free_plugin_list();
1034
1325
1035
1326
free(plugindir);
1327
free(pluginhelperdir);
1036
1328
free(argfile);
1037
1329
1038
1330
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0