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- Committer: Teddy Hogeborn
- Date: 2008-09-02 15:02:37 UTC
- Revision ID: teddy@fukt.bsnet.se-20080902150237-ug2fpsu5s2yvmdl7
* Makefile (run-client): Add "--config-file=plugin-runner.conf".
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
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
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
16
13
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
14
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
15
* General Public License for more details.
19
16
*
20
17
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
22
20
*
23
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
24
22
*/
25
23
26
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
27
O_CLOEXEC, pipe2() */
25
asprintf() */
28
26
#include <stddef.h> /* size_t, NULL */
29
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
30
realloc() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
31
29
#include <stdbool.h> /* bool, true, false */
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() */
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() */
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
42
#include <iso646.h> /* and, or, not */
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
*/
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() */
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
57
55
#include <errno.h> /* errno */
58
56
#include <argp.h> /* struct argp_option, struct
59
57
argp_state, struct argp,
63
61
#include <signal.h> /* struct sigaction, sigemptyset(),
64
62
sigaddset(), sigaction(),
65
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
64
SIG_UNBLOCK, kill() */
68
65
#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() */
75
66
76
67
#define BUFFER_SIZE 256
77
68
78
69
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
71
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
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;
84
76
85
77
typedef struct plugin{
86
78
char *name; /* can be NULL or any plugin name */
89
81
char **environ;
90
82
int envc;
91
83
bool disabled;
92
84
93
85
/* Variables used for running processes*/
94
86
pid_t pid;
95
87
int fd;
97
89
size_t buffer_size;
98
90
size_t buffer_length;
99
91
bool eof;
100
volatile sig_atomic_t completed;
101
int status;
92
volatile bool completed;
93
volatile int status;
102
94
struct plugin *next;
103
95
} plugin;
104
96
105
97
static plugin *plugin_list = NULL;
106
98
107
/* Gets an existing plugin based on name,
99
/* Gets a existing plugin based on name,
108
100
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
101
static plugin *getplugin(char *name){
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))){
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))){
115
106
return p;
116
107
}
117
108
}
118
109
/* Create a new plugin */
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){
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
124
112
return NULL;
125
113
}
126
114
char *copy_name = NULL;
127
115
if(name != NULL){
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
131
117
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
135
118
return NULL;
136
119
}
137
120
}
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;
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){
149
129
free(copy_name);
150
130
free(new_plugin);
151
errno = e;
152
131
return NULL;
153
132
}
154
133
new_plugin->argv[0] = copy_name;
155
134
new_plugin->argv[1] = NULL;
156
135
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
136
new_plugin->environ = malloc(sizeof(char *));
160
137
if(new_plugin->environ == NULL){
161
int e = errno;
162
138
free(copy_name);
163
139
free(new_plugin->argv);
164
140
free(new_plugin);
165
errno = e;
166
141
return NULL;
167
142
}
168
143
new_plugin->environ[0] = NULL;
173
148
}
174
149
175
150
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
151
static bool add_to_char_array(const char *new, char ***array,
178
152
int *len){
179
153
/* Resize the pointed-to array to hold one more pointer */
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);
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
185
156
/* Malloc check */
186
if(new_array == NULL){
157
if(*array == NULL){
187
158
return false;
188
159
}
189
*array = new_array;
190
160
/* Make a copy of the new string */
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
161
char *copy = strdup(new);
195
162
if(copy == NULL){
196
163
return false;
197
164
}
204
171
}
205
172
206
173
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
174
static bool add_argument(plugin *p, const char *arg){
209
175
if(p == NULL){
210
176
return false;
213
179
}
214
180
215
181
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
217
182
static bool add_environment(plugin *p, const char *def, bool replace){
218
183
if(p == NULL){
219
184
return false;
221
186
/* namelen = length of name of environment variable */
222
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
188
/* Search for this environment variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
226
191
/* It already exists */
227
192
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){
193
char *new = realloc(*e, strlen(def));
194
if(new == NULL){
233
195
return false;
234
196
}
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
197
*e = new;
198
strcpy(*e, def);
237
199
}
238
200
return true;
239
201
}
241
203
return add_to_char_array(def, &(p->environ), &(p->envc));
242
204
}
243
205
244
#ifndef O_CLOEXEC
245
206
/*
246
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
208
* Descriptor Flags".
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
249
210
*/
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));
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
253
214
/* If reading the flags failed, return error indication now. */
254
215
if(ret < 0){
255
216
return ret;
256
217
}
257
218
/* Store modified flag word in the descriptor. */
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
260
220
}
261
#endif /* not O_CLOEXEC */
262
221
263
222
264
223
/* Mark processes as completed when they exit, and save their exit
265
224
status. */
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
225
void handle_sigchld(__attribute__((unused)) int sig){
268
226
while(true){
269
227
plugin *proc = plugin_list;
270
228
int status;
274
232
break;
275
233
}
276
234
if(pid == -1){
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
235
if (errno != ECHILD){
236
perror("waitpid");
280
237
}
281
error(0, errno, "waitpid");
238
/* No child processes */
239
break;
282
240
}
283
241
284
242
/* A child exited, find it in process_list */
285
243
while(proc != NULL and proc->pid != pid){
286
244
proc = proc->next;
290
248
continue;
291
249
}
292
250
proc->status = status;
293
proc->completed = 1;
251
proc->completed = true;
294
252
}
295
errno = old_errno;
296
253
}
297
254
298
255
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
300
static bool print_out_password(const char *buffer, size_t length){
256
bool print_out_password(const char *buffer, size_t length){
301
257
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
302
261
for(size_t written = 0; written < length; written += (size_t)ret){
303
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
304
263
length - written));
310
269
}
311
270
312
271
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
314
272
static void free_plugin(plugin *plugin_node){
315
273
316
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
322
280
}
323
281
free(plugin_node->environ);
324
282
free(plugin_node->buffer);
325
283
326
284
/* Removes the plugin from the singly-linked list */
327
285
if(plugin_node == plugin_list){
328
286
/* First one - simple */
348
306
349
307
int main(int argc, char *argv[]){
350
308
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
352
309
char *argfile = NULL;
353
310
FILE *conffp;
354
struct dirent **direntries = NULL;
311
size_t d_name_len;
312
DIR *dir = NULL;
313
struct dirent *dirst;
355
314
struct stat st;
356
315
fd_set rfds_all;
357
316
int ret, maxfd = 0;
358
ssize_t sret;
359
317
uid_t uid = 65534;
360
318
gid_t gid = 65534;
361
319
bool debug = false;
365
323
.sa_flags = SA_NOCLDSTOP };
366
324
char **custom_argv = NULL;
367
325
int custom_argc = 0;
368
int dir_fd = -1;
369
326
370
327
/* Establish a signal handler */
371
328
sigemptyset(&sigchld_action.sa_mask);
372
329
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
373
330
if(ret == -1){
374
error(0, errno, "sigaddset");
375
exitstatus = EX_OSERR;
331
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
376
333
goto fallback;
377
334
}
378
335
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
379
336
if(ret == -1){
380
error(0, errno, "sigaction");
381
exitstatus = EX_OSERR;
337
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
382
339
goto fallback;
383
340
}
384
341
416
373
.doc = "Group ID the plugins will run as", .group = 3 },
417
374
{ .name = "debug", .key = 132,
418
375
.doc = "Debug mode", .group = 4 },
419
{ .name = "plugin-helper-dir", .key = 133,
420
.arg = "DIRECTORY",
421
.doc = "Specify a different plugin helper directory",
422
.group = 2 },
423
/*
424
* These reproduce what we would get without ARGP_NO_HELP
425
*/
426
{ .name = "help", .key = '?',
427
.doc = "Give this help list", .group = -1 },
428
{ .name = "usage", .key = -3,
429
.doc = "Give a short usage message", .group = -1 },
430
{ .name = "version", .key = 'V',
431
.doc = "Print program version", .group = -1 },
432
376
{ .name = NULL }
433
377
};
434
378
435
__attribute__((nonnull(3)))
436
error_t parse_opt(int key, char *arg, struct argp_state *state){
437
errno = 0;
438
switch(key){
439
char *tmp;
440
intmax_t tmp_id;
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
381
switch (key) {
441
382
case 'g': /* --global-options */
442
{
443
char *plugin_option;
444
while((plugin_option = strsep(&arg, ",")) != NULL){
445
if(not add_argument(getplugin(NULL), plugin_option)){
446
break;
383
if (arg != NULL){
384
char *p;
385
while((p = strsep(&arg, ",")) != NULL){
386
if(p[0] == '\0'){
387
continue;
388
}
389
if(not add_argument(getplugin(NULL), p)){
390
perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
447
392
}
448
393
}
449
errno = 0;
450
394
}
451
395
break;
452
396
case 'G': /* --global-env */
453
if(add_environment(getplugin(NULL), arg, true)){
454
errno = 0;
397
if(arg == NULL){
398
break;
399
}
400
{
401
char *envdef = strdup(arg);
402
if(envdef == NULL){
403
break;
404
}
405
if(not add_environment(getplugin(NULL), envdef, true)){
406
perror("add_environment");
407
}
455
408
}
456
409
break;
457
410
case 'o': /* --options-for */
458
{
459
char *option_list = strchr(arg, ':');
460
if(option_list == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
463
break;
464
}
465
*option_list = '\0';
466
option_list++;
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
471
}
472
char *option;
473
while((option = strsep(&option_list, ",")) != NULL){
474
if(not add_argument(getplugin(arg), option)){
475
break;
411
if (arg != NULL){
412
char *p_name = strsep(&arg, ":");
413
if(p_name[0] == '\0'){
414
break;
415
}
416
char *opt = strsep(&arg, ":");
417
if(opt[0] == '\0'){
418
break;
419
}
420
if(opt != NULL){
421
char *p;
422
while((p = strsep(&opt, ",")) != NULL){
423
if(p[0] == '\0'){
424
continue;
425
}
426
if(not add_argument(getplugin(p_name), p)){
427
perror("add_argument");
428
return ARGP_ERR_UNKNOWN;
429
}
476
430
}
477
431
}
478
errno = 0;
479
432
}
480
433
break;
481
434
case 'E': /* --env-for */
435
if(arg == NULL){
436
break;
437
}
482
438
{
483
439
char *envdef = strchr(arg, ':');
484
440
if(envdef == NULL){
485
argp_error(state, "No colon in \"%s\"", arg);
486
errno = EINVAL;
487
break;
488
}
489
*envdef = '\0';
441
break;
442
}
443
char *p_name = strndup(arg, (size_t) (envdef-arg));
444
if(p_name == NULL){
445
break;
446
}
490
447
envdef++;
491
if(arg[0] == '\0'){
492
argp_error(state, "Empty plugin name");
493
errno = EINVAL;
494
break;
495
}
496
if(add_environment(getplugin(arg), envdef, true)){
497
errno = 0;
448
if(not add_environment(getplugin(p_name), envdef, true)){
449
perror("add_environment");
498
450
}
499
451
}
500
452
break;
501
453
case 'd': /* --disable */
502
{
454
if (arg != NULL){
503
455
plugin *p = getplugin(arg);
504
if(p != NULL){
505
p->disabled = true;
506
errno = 0;
456
if(p == NULL){
457
return ARGP_ERR_UNKNOWN;
507
458
}
459
p->disabled = true;
508
460
}
509
461
break;
510
462
case 'e': /* --enable */
511
{
463
if (arg != NULL){
512
464
plugin *p = getplugin(arg);
513
if(p != NULL){
514
p->disabled = false;
515
errno = 0;
465
if(p == NULL){
466
return ARGP_ERR_UNKNOWN;
516
467
}
468
p->disabled = false;
517
469
}
518
470
break;
519
471
case 128: /* --plugin-dir */
520
free(plugindir);
521
472
plugindir = strdup(arg);
522
if(plugindir != NULL){
523
errno = 0;
524
}
473
if(plugindir == NULL){
474
perror("strdup");
475
}
525
476
break;
526
477
case 129: /* --config-file */
527
478
/* This is already done by parse_opt_config_file() */
528
479
break;
529
480
case 130: /* --userid */
530
tmp_id = strtoimax(arg, &tmp, 10);
531
if(errno != 0 or tmp == arg or *tmp != '\0'
532
or tmp_id != (uid_t)tmp_id){
533
argp_error(state, "Bad user ID number: \"%s\", using %"
534
PRIdMAX, arg, (intmax_t)uid);
535
break;
536
}
537
uid = (uid_t)tmp_id;
538
errno = 0;
481
uid = (uid_t)strtol(arg, NULL, 10);
539
482
break;
540
483
case 131: /* --groupid */
541
tmp_id = strtoimax(arg, &tmp, 10);
542
if(errno != 0 or tmp == arg or *tmp != '\0'
543
or tmp_id != (gid_t)tmp_id){
544
argp_error(state, "Bad group ID number: \"%s\", using %"
545
PRIdMAX, arg, (intmax_t)gid);
546
break;
547
}
548
gid = (gid_t)tmp_id;
549
errno = 0;
484
gid = (gid_t)strtol(arg, NULL, 10);
550
485
break;
551
486
case 132: /* --debug */
552
487
debug = true;
553
488
break;
554
case 133: /* --plugin-helper-dir */
555
free(pluginhelperdir);
556
pluginhelperdir = strdup(arg);
557
if(pluginhelperdir != NULL){
558
errno = 0;
559
}
560
break;
561
/*
562
* These reproduce what we would get without ARGP_NO_HELP
563
*/
564
case '?': /* --help */
565
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
566
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
567
case -3: /* --usage */
568
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
569
argp_state_help(state, state->out_stream,
570
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
571
case 'V': /* --version */
572
fprintf(state->out_stream, "%s\n", argp_program_version);
573
exit(EXIT_SUCCESS);
574
break;
575
/*
576
* When adding more options before this line, remember to also add a
577
* "case" to the "parse_opt_config_file" function below.
578
*/
579
489
case ARGP_KEY_ARG:
580
/* Cryptsetup always passes an argument, which is an empty
581
string if "none" was specified in /etc/crypttab. So if
582
argument was empty, we ignore it silently. */
583
if(arg[0] == '\0'){
584
break;
585
}
586
/* FALLTHROUGH */
490
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
491
break;
492
case ARGP_KEY_END:
493
break;
587
494
default:
588
495
return ARGP_ERR_UNKNOWN;
589
496
}
590
return errno; /* Set to 0 at start */
497
return 0;
591
498
}
592
499
593
500
/* This option parser is the same as parse_opt() above, except it
594
501
ignores everything but the --config-file option. */
595
error_t parse_opt_config_file(int key, char *arg,
596
__attribute__((unused))
597
struct argp_state *state){
598
errno = 0;
599
switch(key){
502
error_t parse_opt_config_file (int key, char *arg,
503
__attribute__((unused))
504
struct argp_state *state) {
505
switch (key) {
600
506
case 'g': /* --global-options */
601
507
case 'G': /* --global-env */
602
508
case 'o': /* --options-for */
606
512
case 128: /* --plugin-dir */
607
513
break;
608
514
case 129: /* --config-file */
609
free(argfile);
610
515
argfile = strdup(arg);
611
if(argfile != NULL){
612
errno = 0;
516
if(argfile == NULL){
517
perror("strdup");
613
518
}
614
break;
519
break;
615
520
case 130: /* --userid */
616
521
case 131: /* --groupid */
617
522
case 132: /* --debug */
618
case 133: /* --plugin-helper-dir */
619
case '?': /* --help */
620
case -3: /* --usage */
621
case 'V': /* --version */
622
523
case ARGP_KEY_ARG:
524
case ARGP_KEY_END:
623
525
break;
624
526
default:
625
527
return ARGP_ERR_UNKNOWN;
626
528
}
627
return errno;
529
return 0;
628
530
}
629
531
630
532
struct argp argp = { .options = options,
632
534
.args_doc = "",
633
535
.doc = "Mandos plugin runner -- Run plugins" };
634
536
635
/* Parse using parse_opt_config_file() in order to get the custom
537
/* Parse using the parse_opt_config_file in order to get the custom
636
538
config file location, if any. */
637
ret = argp_parse(&argp, argc, argv,
638
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
639
NULL, NULL);
640
switch(ret){
641
case 0:
642
break;
643
case ENOMEM:
644
default:
645
errno = ret;
646
error(0, errno, "argp_parse");
647
exitstatus = EX_OSERR;
648
goto fallback;
649
case EINVAL:
650
exitstatus = EX_USAGE;
539
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
540
if (ret == ARGP_ERR_UNKNOWN){
541
fprintf(stderr, "Unknown error while parsing arguments\n");
542
exitstatus = EXIT_FAILURE;
651
543
goto fallback;
652
544
}
653
545
655
547
argp.parser = parse_opt;
656
548
657
549
/* Open the configfile if available */
658
if(argfile == NULL){
550
if (argfile == NULL){
659
551
conffp = fopen(AFILE, "r");
660
552
} else {
661
553
conffp = fopen(argfile, "r");
662
}
554
}
663
555
if(conffp != NULL){
664
556
char *org_line = NULL;
665
557
char *p, *arg, *new_arg, *line;
666
558
size_t size = 0;
559
ssize_t sret;
667
560
const char whitespace_delims[] = " \r\t\f\v\n";
668
561
const char comment_delim[] = "#";
669
562
670
563
custom_argc = 1;
671
564
custom_argv = malloc(sizeof(char*) * 2);
672
565
if(custom_argv == NULL){
673
error(0, errno, "malloc");
674
exitstatus = EX_OSERR;
566
perror("malloc");
567
exitstatus = EXIT_FAILURE;
675
568
goto fallback;
676
569
}
677
570
custom_argv[0] = argv[0];
678
571
custom_argv[1] = NULL;
679
572
680
573
/* for each line in the config file, strip whitespace and ignore
681
574
commented text */
682
575
while(true){
684
577
if(sret == -1){
685
578
break;
686
579
}
687
580
688
581
line = org_line;
689
582
arg = strsep(&line, comment_delim);
690
583
while((p = strsep(&arg, whitespace_delims)) != NULL){
693
586
}
694
587
new_arg = strdup(p);
695
588
if(new_arg == NULL){
696
error(0, errno, "strdup");
697
exitstatus = EX_OSERR;
589
perror("strdup");
590
exitstatus = EXIT_FAILURE;
698
591
free(org_line);
699
592
goto fallback;
700
593
}
701
594
702
595
custom_argc += 1;
703
{
704
char **new_argv = realloc(custom_argv, sizeof(char *)
705
* ((size_t)custom_argc + 1));
706
if(new_argv == NULL){
707
error(0, errno, "realloc");
708
exitstatus = EX_OSERR;
709
free(new_arg);
710
free(org_line);
711
goto fallback;
712
} else {
713
custom_argv = new_argv;
714
}
596
custom_argv = realloc(custom_argv, sizeof(char *)
597
* ((unsigned int) custom_argc + 1));
598
if(custom_argv == NULL){
599
perror("realloc");
600
exitstatus = EXIT_FAILURE;
601
free(org_line);
602
goto fallback;
715
603
}
716
604
custom_argv[custom_argc-1] = new_arg;
717
custom_argv[custom_argc] = NULL;
605
custom_argv[custom_argc] = NULL;
718
606
}
719
607
}
720
do {
721
ret = fclose(conffp);
722
} while(ret == EOF and errno == EINTR);
723
if(ret == EOF){
724
error(0, errno, "fclose");
725
exitstatus = EX_IOERR;
726
goto fallback;
727
}
728
608
free(org_line);
729
609
} else {
730
610
/* Check for harmful errors and go to fallback. Other errors might
731
611
not affect opening plugins */
732
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
733
error(0, errno, "fopen");
734
exitstatus = EX_OSERR;
612
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
613
perror("fopen");
614
exitstatus = EXIT_FAILURE;
735
615
goto fallback;
736
616
}
737
617
}
738
/* If there were any arguments from the configuration file, pass
739
them to parser as command line arguments */
618
/* If there was any arguments from configuration file,
619
pass them to parser as command arguments */
740
620
if(custom_argv != NULL){
741
ret = argp_parse(&argp, custom_argc, custom_argv,
742
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
743
NULL, NULL);
744
switch(ret){
745
case 0:
746
break;
747
case ENOMEM:
748
default:
749
errno = ret;
750
error(0, errno, "argp_parse");
751
exitstatus = EX_OSERR;
752
goto fallback;
753
case EINVAL:
754
exitstatus = EX_CONFIG;
621
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
622
0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
755
626
goto fallback;
756
627
}
757
628
}
758
629
759
630
/* Parse actual command line arguments, to let them override the
760
631
config file */
761
ret = argp_parse(&argp, argc, argv,
762
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
763
NULL, NULL);
764
switch(ret){
765
case 0:
766
break;
767
case ENOMEM:
768
default:
769
errno = ret;
770
error(0, errno, "argp_parse");
771
exitstatus = EX_OSERR;
772
goto fallback;
773
case EINVAL:
774
exitstatus = EX_USAGE;
775
goto fallback;
776
}
777
778
{
779
char *pluginhelperenv;
780
bool bret = true;
781
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
782
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
783
if(ret != -1){
784
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
785
}
786
if(ret == -1 or not bret){
787
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
788
" environment variable to \"%s\" for all plugins\n",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
790
}
791
if(ret != -1){
792
free(pluginhelperenv);
793
}
632
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
633
if (ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
exitstatus = EXIT_FAILURE;
636
goto fallback;
794
637
}
795
638
796
639
if(debug){
797
for(plugin *p = plugin_list; p != NULL; p = p->next){
640
for(plugin *p = plugin_list; p != NULL; p=p->next){
798
641
fprintf(stderr, "Plugin: %s has %d arguments\n",
799
642
p->name ? p->name : "Global", p->argc - 1);
800
643
for(char **a = p->argv; *a != NULL; a++){
801
644
fprintf(stderr, "\tArg: %s\n", *a);
802
645
}
803
fprintf(stderr, "...and %d environment variables\n", p->envc);
646
fprintf(stderr, "...and %u environment variables\n", p->envc);
804
647
for(char **a = p->environ; *a != NULL; a++){
805
648
fprintf(stderr, "\t%s\n", *a);
806
649
}
807
650
}
808
651
}
809
652
810
if(getuid() == 0){
811
/* Work around Debian bug #633582:
812
<https://bugs.debian.org/633582> */
813
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
814
if(plugindir_fd == -1){
815
if(errno != ENOENT){
816
error(0, errno, "open(\"" PDIR "\")");
817
}
818
} else {
819
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
820
if(ret == -1){
821
error(0, errno, "fstat");
822
} else {
823
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
824
ret = fchown(plugindir_fd, uid, gid);
825
if(ret == -1){
826
error(0, errno, "fchown");
827
}
828
}
829
}
830
close(plugindir_fd);
831
}
832
}
833
834
/* Lower permissions */
835
ret = setgid(gid);
836
if(ret == -1){
837
error(0, errno, "setgid");
838
}
653
/* Strip permissions down to nobody */
839
654
ret = setuid(uid);
840
if(ret == -1){
841
error(0, errno, "setuid");
842
}
843
844
/* Open plugin directory with close_on_exec flag */
655
if (ret == -1){
656
perror("setuid");
657
}
658
setgid(gid);
659
if (ret == -1){
660
perror("setgid");
661
}
662
663
if (plugindir == NULL){
664
dir = opendir(PDIR);
665
} else {
666
dir = opendir(plugindir);
667
}
668
669
if(dir == NULL){
670
perror("Could not open plugin dir");
671
exitstatus = EXIT_FAILURE;
672
goto fallback;
673
}
674
675
/* Set the FD_CLOEXEC flag on the directory, if possible */
845
676
{
846
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
847
#ifdef O_CLOEXEC
848
O_CLOEXEC
849
#else /* not O_CLOEXEC */
850
0
851
#endif /* not O_CLOEXEC */
852
);
853
if(dir_fd == -1){
854
error(0, errno, "Could not open plugin dir");
855
exitstatus = EX_UNAVAILABLE;
856
goto fallback;
857
}
858
859
#ifndef O_CLOEXEC
860
/* Set the FD_CLOEXEC flag on the directory */
861
ret = set_cloexec_flag(dir_fd);
862
if(ret < 0){
863
error(0, errno, "set_cloexec_flag");
864
exitstatus = EX_OSERR;
865
goto fallback;
866
}
867
#endif /* O_CLOEXEC */
868
}
869
870
int good_name(const struct dirent * const dirent){
871
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
872
"*.dpkg-old", "*.dpkg-bak",
873
"*.dpkg-divert", NULL };
874
#ifdef __GNUC__
875
#pragma GCC diagnostic push
876
#pragma GCC diagnostic ignored "-Wcast-qual"
877
#endif
878
for(const char **pat = (const char **)patterns;
879
*pat != NULL; pat++){
880
#ifdef __GNUC__
881
#pragma GCC diagnostic pop
882
#endif
883
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
884
!= FNM_NOMATCH){
885
if(debug){
886
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
887
" matching pattern %s\n", dirent->d_name, *pat);
888
}
889
return 0;
677
int dir_fd = dirfd(dir);
678
if(dir_fd >= 0){
679
ret = set_cloexec_flag(dir_fd);
680
if(ret < 0){
681
perror("set_cloexec_flag");
682
exitstatus = EXIT_FAILURE;
683
goto fallback;
890
684
}
891
685
}
892
return 1;
893
}
894
895
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
896
alphasort);
897
if(numplugins == -1){
898
error(0, errno, "Could not scan plugin dir");
899
direntries = NULL;
900
exitstatus = EX_OSERR;
901
goto fallback;
902
686
}
903
687
904
688
FD_ZERO(&rfds_all);
905
689
906
690
/* Read and execute any executable in the plugin directory*/
907
for(int i = 0; i < numplugins; i++){
908
909
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
910
if(plugin_fd == -1){
911
error(0, errno, "Could not open plugin");
912
free(direntries[i]);
913
continue;
914
}
915
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
916
if(ret == -1){
917
error(0, errno, "stat");
918
close(plugin_fd);
919
free(direntries[i]);
920
continue;
921
}
922
691
while(true){
692
dirst = readdir(dir);
693
694
/* All directory entries have been processed */
695
if(dirst == NULL){
696
if (errno == EBADF){
697
perror("readdir");
698
exitstatus = EXIT_FAILURE;
699
goto fallback;
700
}
701
break;
702
}
703
704
d_name_len = strlen(dirst->d_name);
705
706
/* Ignore dotfiles, backup files and other junk */
707
{
708
bool bad_name = false;
709
710
const char const *bad_prefixes[] = { ".", "#", NULL };
711
712
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
713
".dpkg-old",
714
".dpkg-divert", NULL };
715
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
716
size_t pre_len = strlen(*pre);
717
if((d_name_len >= pre_len)
718
and strncmp((dirst->d_name), *pre, pre_len) == 0){
719
if(debug){
720
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
721
" with bad prefix %s\n", dirst->d_name, *pre);
722
}
723
bad_name = true;
724
break;
725
}
726
}
727
if(bad_name){
728
continue;
729
}
730
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
731
size_t suf_len = strlen(*suf);
732
if((d_name_len >= suf_len)
733
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
734
== 0)){
735
if(debug){
736
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
737
" with bad suffix %s\n", dirst->d_name, *suf);
738
}
739
bad_name = true;
740
break;
741
}
742
}
743
744
if(bad_name){
745
continue;
746
}
747
}
748
749
char *filename;
750
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
751
if(ret < 0){
752
perror("asprintf");
753
continue;
754
}
755
756
ret = stat(filename, &st);
757
if (ret == -1){
758
perror("stat");
759
free(filename);
760
continue;
761
}
762
923
763
/* Ignore non-executable files */
924
if(not S_ISREG(st.st_mode)
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
926
X_OK, 0)) != 0)){
764
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
927
765
if(debug){
928
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
929
" with bad type or mode\n",
930
plugindir != NULL ? plugindir : PDIR,
931
direntries[i]->d_name);
766
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
767
" with bad type or mode\n", filename);
932
768
}
933
close(plugin_fd);
934
free(direntries[i]);
769
free(filename);
935
770
continue;
936
771
}
937
772
938
plugin *p = getplugin(direntries[i]->d_name);
773
plugin *p = getplugin(dirst->d_name);
939
774
if(p == NULL){
940
error(0, errno, "getplugin");
941
close(plugin_fd);
942
free(direntries[i]);
775
perror("getplugin");
776
free(filename);
943
777
continue;
944
778
}
945
779
if(p->disabled){
946
780
if(debug){
947
781
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
948
direntries[i]->d_name);
782
dirst->d_name);
949
783
}
950
close(plugin_fd);
951
free(direntries[i]);
784
free(filename);
952
785
continue;
953
786
}
954
787
{
957
790
if(g != NULL){
958
791
for(char **a = g->argv + 1; *a != NULL; a++){
959
792
if(not add_argument(p, *a)){
960
error(0, errno, "add_argument");
793
perror("add_argument");
961
794
}
962
795
}
963
796
/* Add global environment variables */
964
797
for(char **e = g->environ; *e != NULL; e++){
965
798
if(not add_environment(p, *e, false)){
966
error(0, errno, "add_environment");
799
perror("add_environment");
967
800
}
968
801
}
969
802
}
970
803
}
971
/* If this plugin has any environment variables, we need to
972
duplicate the environment from this process, too. */
804
/* If this plugin has any environment variables, we will call
805
using execve and need to duplicate the environment from this
806
process, too. */
973
807
if(p->environ[0] != NULL){
974
808
for(char **e = environ; *e != NULL; e++){
975
809
if(not add_environment(p, *e, false)){
976
error(0, errno, "add_environment");
810
perror("add_environment");
977
811
}
978
812
}
979
813
}
980
814
981
815
int pipefd[2];
982
#ifndef O_CLOEXEC
983
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
984
#else /* O_CLOEXEC */
985
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
986
#endif /* O_CLOEXEC */
987
if(ret == -1){
988
error(0, errno, "pipe");
989
exitstatus = EX_OSERR;
990
free(direntries[i]);
991
goto fallback;
992
}
993
if(pipefd[0] >= FD_SETSIZE){
994
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
995
FD_SETSIZE);
996
close(pipefd[0]);
997
close(pipefd[1]);
998
exitstatus = EX_OSERR;
999
free(direntries[i]);
1000
goto fallback;
1001
}
1002
#ifndef O_CLOEXEC
816
ret = pipe(pipefd);
817
if (ret == -1){
818
perror("pipe");
819
exitstatus = EXIT_FAILURE;
820
goto fallback;
821
}
1003
822
/* Ask OS to automatic close the pipe on exec */
1004
823
ret = set_cloexec_flag(pipefd[0]);
1005
824
if(ret < 0){
1006
error(0, errno, "set_cloexec_flag");
1007
close(pipefd[0]);
1008
close(pipefd[1]);
1009
exitstatus = EX_OSERR;
1010
free(direntries[i]);
825
perror("set_cloexec_flag");
826
exitstatus = EXIT_FAILURE;
1011
827
goto fallback;
1012
828
}
1013
829
ret = set_cloexec_flag(pipefd[1]);
1014
830
if(ret < 0){
1015
error(0, errno, "set_cloexec_flag");
1016
close(pipefd[0]);
1017
close(pipefd[1]);
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
831
perror("set_cloexec_flag");
832
exitstatus = EXIT_FAILURE;
1020
833
goto fallback;
1021
834
}
1022
#endif /* not O_CLOEXEC */
1023
835
/* Block SIGCHLD until process is safely in process list */
1024
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1025
&sigchld_action.sa_mask,
1026
NULL));
836
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1027
837
if(ret < 0){
1028
error(0, errno, "sigprocmask");
1029
exitstatus = EX_OSERR;
1030
free(direntries[i]);
838
perror("sigprocmask");
839
exitstatus = EXIT_FAILURE;
1031
840
goto fallback;
1032
841
}
1033
842
/* Starting a new process to be watched */
1034
pid_t pid;
1035
do {
1036
pid = fork();
1037
} while(pid == -1 and errno == EINTR);
843
pid_t pid = fork();
1038
844
if(pid == -1){
1039
error(0, errno, "fork");
1040
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1041
&sigchld_action.sa_mask, NULL));
1042
close(pipefd[0]);
1043
close(pipefd[1]);
1044
exitstatus = EX_OSERR;
1045
free(direntries[i]);
845
perror("fork");
846
exitstatus = EXIT_FAILURE;
1046
847
goto fallback;
1047
848
}
1048
849
if(pid == 0){
1049
850
/* this is the child process */
1050
851
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1051
852
if(ret < 0){
1052
error(0, errno, "sigaction");
1053
_exit(EX_OSERR);
853
perror("sigaction");
854
_exit(EXIT_FAILURE);
1054
855
}
1055
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
856
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1056
857
if(ret < 0){
1057
error(0, errno, "sigprocmask");
1058
_exit(EX_OSERR);
858
perror("sigprocmask");
859
_exit(EXIT_FAILURE);
1059
860
}
1060
861
1061
862
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1062
863
if(ret == -1){
1063
error(0, errno, "dup2");
1064
_exit(EX_OSERR);
864
perror("dup2");
865
_exit(EXIT_FAILURE);
1065
866
}
1066
867
1067
if(fexecve(plugin_fd, p->argv,
1068
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1069
error(0, errno, "fexecve for %s/%s",
1070
plugindir != NULL ? plugindir : PDIR,
1071
direntries[i]->d_name);
1072
_exit(EX_OSERR);
868
if(dirfd(dir) < 0){
869
/* If dir has no file descriptor, we could not set FD_CLOEXEC
870
above and must now close it manually here. */
871
closedir(dir);
872
}
873
if(p->environ[0] == NULL){
874
if(execv(filename, p->argv) < 0){
875
perror("execv");
876
_exit(EXIT_FAILURE);
877
}
878
} else {
879
if(execve(filename, p->argv, p->environ) < 0){
880
perror("execve");
881
_exit(EXIT_FAILURE);
882
}
1073
883
}
1074
884
/* no return */
1075
885
}
1076
886
/* Parent process */
1077
887
close(pipefd[1]); /* Close unused write end of pipe */
1078
close(plugin_fd);
1079
plugin *new_plugin = getplugin(direntries[i]->d_name);
1080
if(new_plugin == NULL){
1081
error(0, errno, "getplugin");
1082
ret = (int)(TEMP_FAILURE_RETRY
1083
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1084
NULL)));
888
free(filename);
889
plugin *new_plugin = getplugin(dirst->d_name);
890
if (new_plugin == NULL){
891
perror("getplugin");
892
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1085
893
if(ret < 0){
1086
error(0, errno, "sigprocmask");
894
perror("sigprocmask");
1087
895
}
1088
exitstatus = EX_OSERR;
1089
free(direntries[i]);
896
exitstatus = EXIT_FAILURE;
1090
897
goto fallback;
1091
898
}
1092
free(direntries[i]);
1093
899
1094
900
new_plugin->pid = pid;
1095
901
new_plugin->fd = pipefd[0];
1096
1097
if(debug){
1098
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1099
new_plugin->name, (intmax_t) (new_plugin->pid));
1100
}
1101
902
1102
903
/* Unblock SIGCHLD so signal handler can be run if this process
1103
904
has already completed */
1104
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1105
&sigchld_action.sa_mask,
1106
NULL));
905
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1107
906
if(ret < 0){
1108
error(0, errno, "sigprocmask");
1109
exitstatus = EX_OSERR;
907
perror("sigprocmask");
908
exitstatus = EXIT_FAILURE;
1110
909
goto fallback;
1111
910
}
1112
911
1113
912
FD_SET(new_plugin->fd, &rfds_all);
1114
913
1115
if(maxfd < new_plugin->fd){
914
if (maxfd < new_plugin->fd){
1116
915
maxfd = new_plugin->fd;
1117
916
}
917
1118
918
}
1119
919
1120
free(direntries);
1121
direntries = NULL;
1122
close(dir_fd);
1123
dir_fd = -1;
1124
free_plugin(getplugin(NULL));
1125
920
closedir(dir);
921
dir = NULL;
922
1126
923
for(plugin *p = plugin_list; p != NULL; p = p->next){
1127
924
if(p->pid != 0){
1128
925
break;
1133
930
free_plugin_list();
1134
931
}
1135
932
}
1136
933
1137
934
/* Main loop while running plugins exist */
1138
935
while(plugin_list){
1139
936
fd_set rfds = rfds_all;
1140
937
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1141
if(select_ret == -1 and errno != EINTR){
1142
error(0, errno, "select");
1143
exitstatus = EX_OSERR;
938
if (select_ret == -1){
939
perror("select");
940
exitstatus = EXIT_FAILURE;
1144
941
goto fallback;
1145
942
}
1146
943
/* OK, now either a process completed, or something can be read
1147
944
from one of them */
1148
for(plugin *proc = plugin_list; proc != NULL;){
945
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1149
946
/* Is this process completely done? */
1150
if(proc->completed and proc->eof){
947
if(proc->eof and proc->completed){
1151
948
/* Only accept the plugin output if it exited cleanly */
1152
949
if(not WIFEXITED(proc->status)
1153
950
or WEXITSTATUS(proc->status) != 0){
1154
951
/* Bad exit by plugin */
1155
952
1156
953
if(debug){
1157
954
if(WIFEXITED(proc->status)){
1158
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1159
" status %d\n", proc->name,
1160
(intmax_t) (proc->pid),
955
fprintf(stderr, "Plugin %u exited with status %d\n",
956
(unsigned int) (proc->pid),
1161
957
WEXITSTATUS(proc->status));
1162
} else if(WIFSIGNALED(proc->status)){
1163
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1164
" signal %d: %s\n", proc->name,
1165
(intmax_t) (proc->pid),
1166
WTERMSIG(proc->status),
1167
strsignal(WTERMSIG(proc->status)));
958
} else if(WIFSIGNALED(proc->status)) {
959
fprintf(stderr, "Plugin %u killed by signal %d\n",
960
(unsigned int) (proc->pid),
961
WTERMSIG(proc->status));
962
} else if(WCOREDUMP(proc->status)){
963
fprintf(stderr, "Plugin %d dumped core\n",
964
(unsigned int) (proc->pid));
1168
965
}
1169
966
}
1170
967
1171
968
/* Remove the plugin */
1172
969
FD_CLR(proc->fd, &rfds_all);
1173
970
1174
971
/* Block signal while modifying process_list */
1175
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1176
(SIG_BLOCK,
1177
&sigchld_action.sa_mask,
1178
NULL));
972
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1179
973
if(ret < 0){
1180
error(0, errno, "sigprocmask");
1181
exitstatus = EX_OSERR;
974
perror("sigprocmask");
975
exitstatus = EXIT_FAILURE;
1182
976
goto fallback;
1183
977
}
1184
1185
plugin *next_plugin = proc->next;
1186
978
free_plugin(proc);
1187
proc = next_plugin;
1188
1189
979
/* We are done modifying process list, so unblock signal */
1190
ret = (int)(TEMP_FAILURE_RETRY
1191
(sigprocmask(SIG_UNBLOCK,
1192
&sigchld_action.sa_mask, NULL)));
980
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
981
NULL);
1193
982
if(ret < 0){
1194
error(0, errno, "sigprocmask");
1195
exitstatus = EX_OSERR;
983
perror("sigprocmask");
984
exitstatus = EXIT_FAILURE;
1196
985
goto fallback;
1197
986
}
1198
987
1199
988
if(plugin_list == NULL){
1200
989
break;
1201
990
}
1202
1203
991
continue;
1204
992
}
1205
993
1206
994
/* This process exited nicely, so print its buffer */
1207
995
1208
996
bool bret = print_out_password(proc->buffer,
1209
997
proc->buffer_length);
1210
998
if(not bret){
1211
error(0, errno, "print_out_password");
1212
exitstatus = EX_IOERR;
999
perror("print_out_password");
1000
exitstatus = EXIT_FAILURE;
1213
1001
}
1214
1002
goto fallback;
1215
1003
}
1217
1005
/* This process has not completed. Does it have any output? */
1218
1006
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1219
1007
/* This process had nothing to say at this time */
1220
proc = proc->next;
1221
1008
continue;
1222
1009
}
1223
1010
/* Before reading, make the process' data buffer large enough */
1224
1011
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1225
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1226
+ (size_t) BUFFER_SIZE);
1227
if(new_buffer == NULL){
1228
error(0, errno, "malloc");
1229
exitstatus = EX_OSERR;
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1013
+ (size_t) BUFFER_SIZE);
1014
if (proc->buffer == NULL){
1015
perror("malloc");
1016
exitstatus = EXIT_FAILURE;
1230
1017
goto fallback;
1231
1018
}
1232
proc->buffer = new_buffer;
1233
1019
proc->buffer_size += BUFFER_SIZE;
1234
1020
}
1235
1021
/* Read from the process */
1236
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1237
proc->buffer
1238
+ proc->buffer_length,
1239
BUFFER_SIZE));
1240
if(sret < 0){
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(ret < 0){
1241
1025
/* Read error from this process; ignore the error */
1242
proc = proc->next;
1243
1026
continue;
1244
1027
}
1245
if(sret == 0){
1028
if(ret == 0){
1246
1029
/* got EOF */
1247
1030
proc->eof = true;
1248
1031
} else {
1249
proc->buffer_length += (size_t) sret;
1032
proc->buffer_length += (size_t) ret;
1250
1033
}
1251
1034
}
1252
1035
}
1253
1254
1036
1037
1255
1038
fallback:
1256
1039
1257
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1258
and exitstatus != EX_OK)){
1040
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1259
1041
/* Fallback if all plugins failed, none are found or an error
1260
1042
occured */
1261
1043
bool bret;
1262
1044
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1263
1045
char *passwordbuffer = getpass("Password: ");
1264
size_t len = strlen(passwordbuffer);
1265
/* Strip trailing newline */
1266
if(len > 0 and passwordbuffer[len-1] == '\n'){
1267
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1268
len--;
1269
}
1270
bret = print_out_password(passwordbuffer, len);
1046
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1271
1047
if(not bret){
1272
error(0, errno, "print_out_password");
1273
exitstatus = EX_IOERR;
1048
perror("print_out_password");
1049
exitstatus = EXIT_FAILURE;
1274
1050
}
1275
1051
}
1276
1052
1277
1053
/* Restore old signal handler */
1278
1054
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1279
1055
if(ret == -1){
1280
error(0, errno, "sigaction");
1281
exitstatus = EX_OSERR;
1056
perror("sigaction");
1057
exitstatus = EXIT_FAILURE;
1282
1058
}
1283
1059
1284
1060
if(custom_argv != NULL){
1285
1061
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1286
1062
free(*arg);
1288
1064
free(custom_argv);
1289
1065
}
1290
1066
1291
free(direntries);
1292
1293
if(dir_fd != -1){
1294
close(dir_fd);
1067
if(dir != NULL){
1068
closedir(dir);
1295
1069
}
1296
1070
1297
/* Kill the processes */
1071
/* Free the process list and kill the processes */
1298
1072
for(plugin *p = plugin_list; p != NULL; p = p->next){
1299
1073
if(p->pid != 0){
1300
1074
close(p->fd);
1301
1075
ret = kill(p->pid, SIGTERM);
1302
1076
if(ret == -1 and errno != ESRCH){
1303
1077
/* Set-uid proccesses might not get closed */
1304
error(0, errno, "kill");
1078
perror("kill");
1305
1079
}
1306
1080
}
1307
1081
}
1308
1082
1309
1083
/* Wait for any remaining child processes to terminate */
1310
do {
1084
do{
1311
1085
ret = wait(NULL);
1312
1086
} while(ret >= 0);
1313
1087
if(errno != ECHILD){
1314
error(0, errno, "wait");
1088
perror("wait");
1315
1089
}
1316
1090
1317
1091
free_plugin_list();
1318
1092
1319
1093
free(plugindir);
1320
free(pluginhelperdir);
1321
1094
free(argfile);
1322
1095
1323
1096
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0