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- Committer: Teddy Hogeborn
- Date: 2008-08-31 16:04:47 UTC
- mfrom: (24.1.77 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080831160447-2xte5k90onspphki
Merge.
- 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 © 2008-2016 Teddy Hogeborn
6
* Copyright © 2008-2016 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
19
18
* along with this program. If not, see
20
19
* <http://www.gnu.org/licenses/>.
21
20
*
22
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
22
*/
24
23
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
O_CLOEXEC, pipe2() */
25
asprintf() */
27
26
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
36
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() */
37
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
38
FD_SET(), FD_ISSET(), FD_CLR */
39
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS(), WTERMSIG() */
41
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
42
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* struct dirent, scandirat() */
44
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
45
FD_CLOEXEC, write(), STDOUT_FILENO,
46
struct stat, fstat(), close(),
47
setgid(), setuid(), S_ISREG(),
48
faccessat() pipe2(), fork(),
49
_exit(), dup2(), fexecve(), read()
50
*/
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() */
51
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
52
FD_CLOEXEC, openat(), scandirat(),
53
pipe2() */
54
#include <string.h> /* strsep, strlen(), strsignal(),
55
strcmp(), strncmp() */
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
55
#include <errno.h> /* errno */
57
56
#include <argp.h> /* struct argp_option, struct
58
57
argp_state, struct argp,
62
61
#include <signal.h> /* struct sigaction, sigemptyset(),
63
62
sigaddset(), sigaction(),
64
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill(), sig_atomic_t
66
*/
64
SIG_UNBLOCK, kill() */
67
65
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
69
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
70
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
71
#include <errno.h> /* errno */
72
#include <error.h> /* error() */
73
#include <fnmatch.h> /* fnmatch() */
74
66
75
67
#define BUFFER_SIZE 256
76
68
77
69
#define PDIR "/lib/mandos/plugins.d"
78
#define PHDIR "/lib/mandos/plugin-helpers"
79
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
71
81
const char *argp_program_version = "plugin-runner " VERSION;
82
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;
83
76
84
77
typedef struct plugin{
85
78
char *name; /* can be NULL or any plugin name */
88
81
char **environ;
89
82
int envc;
90
83
bool disabled;
91
84
92
85
/* Variables used for running processes*/
93
86
pid_t pid;
94
87
int fd;
96
89
size_t buffer_size;
97
90
size_t buffer_length;
98
91
bool eof;
99
volatile sig_atomic_t completed;
100
int status;
92
volatile bool completed;
93
volatile int status;
101
94
struct plugin *next;
102
95
} plugin;
103
96
104
97
static plugin *plugin_list = NULL;
105
98
106
/* Gets an existing plugin based on name,
99
/* Gets a existing plugin based on name,
107
100
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
109
101
static plugin *getplugin(char *name){
110
/* Check for existing plugin with that name */
111
for(plugin *p = plugin_list; p != NULL; p = p->next){
112
if((p->name == name)
113
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))){
114
106
return p;
115
107
}
116
108
}
117
109
/* Create a new plugin */
118
plugin *new_plugin = NULL;
119
do {
120
new_plugin = malloc(sizeof(plugin));
121
} while(new_plugin == NULL and errno == EINTR);
122
if(new_plugin == NULL){
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
123
112
return NULL;
124
113
}
125
114
char *copy_name = NULL;
126
115
if(name != NULL){
127
do {
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
130
117
if(copy_name == NULL){
131
int e = errno;
132
free(new_plugin);
133
errno = e;
134
118
return NULL;
135
119
}
136
120
}
137
138
*new_plugin = (plugin){ .name = copy_name,
139
.argc = 1,
140
.disabled = false,
141
.next = plugin_list };
142
143
do {
144
new_plugin->argv = malloc(sizeof(char *) * 2);
145
} while(new_plugin->argv == NULL and errno == EINTR);
146
if(new_plugin->argv == NULL){
147
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){
148
129
free(copy_name);
149
130
free(new_plugin);
150
errno = e;
151
131
return NULL;
152
132
}
153
133
new_plugin->argv[0] = copy_name;
154
134
new_plugin->argv[1] = NULL;
155
156
do {
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
135
136
new_plugin->environ = malloc(sizeof(char *));
159
137
if(new_plugin->environ == NULL){
160
int e = errno;
161
138
free(copy_name);
162
139
free(new_plugin->argv);
163
140
free(new_plugin);
164
errno = e;
165
141
return NULL;
166
142
}
167
143
new_plugin->environ[0] = NULL;
168
144
169
145
/* Append the new plugin to the list */
170
146
plugin_list = new_plugin;
171
147
return new_plugin;
172
148
}
173
149
174
150
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
176
151
static bool add_to_char_array(const char *new, char ***array,
177
152
int *len){
178
153
/* Resize the pointed-to array to hold one more pointer */
179
char **new_array = NULL;
180
do {
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
184
156
/* Malloc check */
185
if(new_array == NULL){
157
if(*array == NULL){
186
158
return false;
187
159
}
188
*array = new_array;
189
160
/* Make a copy of the new string */
190
char *copy;
191
do {
192
copy = strdup(new);
193
} while(copy == NULL and errno == EINTR);
161
char *copy = strdup(new);
194
162
if(copy == NULL){
195
163
return false;
196
164
}
203
171
}
204
172
205
173
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
207
174
static bool add_argument(plugin *p, const char *arg){
208
175
if(p == NULL){
209
176
return false;
212
179
}
213
180
214
181
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
216
static bool add_environment(plugin *p, const char *def, bool replace){
182
static bool add_environment(plugin *p, const char *def){
217
183
if(p == NULL){
218
184
return false;
219
185
}
220
/* namelen = length of name of environment variable */
221
size_t namelen = (size_t)(strchrnul(def, '=') - def);
222
/* Search for this environment variable */
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
225
/* It already exists */
226
if(replace){
227
char *new_envdef;
228
do {
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
232
return false;
233
}
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
236
}
237
return true;
238
}
239
}
240
186
return add_to_char_array(def, &(p->environ), &(p->envc));
241
187
}
242
188
243
#ifndef O_CLOEXEC
244
189
/*
245
190
* Based on the example in the GNU LibC manual chapter 13.13 "File
246
191
* Descriptor Flags".
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
192
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
193
*/
249
__attribute__((warn_unused_result))
250
static int set_cloexec_flag(int fd){
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
194
static int set_cloexec_flag(int fd)
195
{
196
int ret = fcntl(fd, F_GETFD, 0);
252
197
/* If reading the flags failed, return error indication now. */
253
198
if(ret < 0){
254
199
return ret;
255
200
}
256
201
/* Store modified flag word in the descriptor. */
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
258
ret | FD_CLOEXEC));
202
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
259
203
}
260
#endif /* not O_CLOEXEC */
261
204
262
205
263
206
/* Mark processes as completed when they exit, and save their exit
264
207
status. */
265
static void handle_sigchld(__attribute__((unused)) int sig){
266
int old_errno = errno;
208
void handle_sigchld(__attribute__((unused)) int sig){
267
209
while(true){
268
210
plugin *proc = plugin_list;
269
211
int status;
273
215
break;
274
216
}
275
217
if(pid == -1){
276
if(errno == ECHILD){
277
/* No child processes */
278
break;
218
if (errno != ECHILD){
219
perror("waitpid");
279
220
}
280
error(0, errno, "waitpid");
221
/* No child processes */
222
break;
281
223
}
282
224
283
225
/* A child exited, find it in process_list */
284
226
while(proc != NULL and proc->pid != pid){
285
227
proc = proc->next;
289
231
continue;
290
232
}
291
233
proc->status = status;
292
proc->completed = 1;
234
proc->completed = true;
293
235
}
294
errno = old_errno;
295
236
}
296
237
297
238
/* Prints out a password to stdout */
298
__attribute__((nonnull, warn_unused_result))
299
static bool print_out_password(const char *buffer, size_t length){
239
bool print_out_password(const char *buffer, size_t length){
300
240
ssize_t ret;
241
if(length>0 and buffer[length-1] == '\n'){
242
length--;
243
}
301
244
for(size_t written = 0; written < length; written += (size_t)ret){
302
245
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
303
246
length - written));
309
252
}
310
253
311
254
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
313
255
static void free_plugin(plugin *plugin_node){
314
256
315
257
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
321
263
}
322
264
free(plugin_node->environ);
323
265
free(plugin_node->buffer);
324
266
325
267
/* Removes the plugin from the singly-linked list */
326
268
if(plugin_node == plugin_list){
327
269
/* First one - simple */
347
289
348
290
int main(int argc, char *argv[]){
349
291
char *plugindir = NULL;
350
char *pluginhelperdir = NULL;
351
292
char *argfile = NULL;
352
293
FILE *conffp;
353
struct dirent **direntries = NULL;
294
size_t d_name_len;
295
DIR *dir = NULL;
296
struct dirent *dirst;
354
297
struct stat st;
355
298
fd_set rfds_all;
356
299
int ret, maxfd = 0;
357
ssize_t sret;
358
300
uid_t uid = 65534;
359
301
gid_t gid = 65534;
360
302
bool debug = false;
364
306
.sa_flags = SA_NOCLDSTOP };
365
307
char **custom_argv = NULL;
366
308
int custom_argc = 0;
367
int dir_fd = -1;
368
309
369
310
/* Establish a signal handler */
370
311
sigemptyset(&sigchld_action.sa_mask);
371
312
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
372
313
if(ret == -1){
373
error(0, errno, "sigaddset");
374
exitstatus = EX_OSERR;
314
perror("sigaddset");
315
exitstatus = EXIT_FAILURE;
375
316
goto fallback;
376
317
}
377
318
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
378
319
if(ret == -1){
379
error(0, errno, "sigaction");
380
exitstatus = EX_OSERR;
320
perror("sigaction");
321
exitstatus = EXIT_FAILURE;
381
322
goto fallback;
382
323
}
383
324
386
327
{ .name = "global-options", .key = 'g',
387
328
.arg = "OPTION[,OPTION[,...]]",
388
329
.doc = "Options passed to all plugins" },
389
{ .name = "global-env", .key = 'G',
330
{ .name = "global-envs", .key = 'e',
390
331
.arg = "VAR=value",
391
332
.doc = "Environment variable passed to all plugins" },
392
333
{ .name = "options-for", .key = 'o',
393
334
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
394
335
.doc = "Options passed only to specified plugin" },
395
{ .name = "env-for", .key = 'E',
336
{ .name = "envs-for", .key = 'f',
396
337
.arg = "PLUGIN:ENV=value",
397
338
.doc = "Environment variable passed to specified plugin" },
398
339
{ .name = "disable", .key = 'd',
399
340
.arg = "PLUGIN",
400
341
.doc = "Disable a specific plugin", .group = 1 },
401
{ .name = "enable", .key = 'e',
402
.arg = "PLUGIN",
403
.doc = "Enable a specific plugin", .group = 1 },
404
342
{ .name = "plugin-dir", .key = 128,
405
343
.arg = "DIRECTORY",
406
344
.doc = "Specify a different plugin directory", .group = 2 },
415
353
.doc = "Group ID the plugins will run as", .group = 3 },
416
354
{ .name = "debug", .key = 132,
417
355
.doc = "Debug mode", .group = 4 },
418
{ .name = "plugin-helper-dir", .key = 133,
419
.arg = "DIRECTORY",
420
.doc = "Specify a different plugin helper directory",
421
.group = 2 },
422
/*
423
* These reproduce what we would get without ARGP_NO_HELP
424
*/
425
{ .name = "help", .key = '?',
426
.doc = "Give this help list", .group = -1 },
427
{ .name = "usage", .key = -3,
428
.doc = "Give a short usage message", .group = -1 },
429
{ .name = "version", .key = 'V',
430
.doc = "Print program version", .group = -1 },
431
356
{ .name = NULL }
432
357
};
433
358
434
__attribute__((nonnull(3)))
435
error_t parse_opt(int key, char *arg, struct argp_state *state){
436
errno = 0;
437
switch(key){
438
char *tmp;
439
intmax_t tmp_id;
359
error_t parse_opt (int key, char *arg, __attribute__((unused)) struct argp_state *state) {
360
/* Get the INPUT argument from `argp_parse', which we know is a
361
pointer to our plugin list pointer. */
362
switch (key) {
440
363
case 'g': /* --global-options */
364
if (arg != NULL){
365
char *p;
366
while((p = strsep(&arg, ",")) != NULL){
367
if(p[0] == '\0'){
368
continue;
369
}
370
if(not add_argument(getplugin(NULL), p)){
371
perror("add_argument");
372
return ARGP_ERR_UNKNOWN;
373
}
374
}
375
}
376
break;
377
case 'e': /* --global-envs */
378
if(arg == NULL){
379
break;
380
}
441
381
{
442
char *plugin_option;
443
while((plugin_option = strsep(&arg, ",")) != NULL){
444
if(not add_argument(getplugin(NULL), plugin_option)){
445
break;
446
}
447
}
448
errno = 0;
449
}
450
break;
451
case 'G': /* --global-env */
452
if(add_environment(getplugin(NULL), arg, true)){
453
errno = 0;
382
char *envdef = strdup(arg);
383
if(envdef == NULL){
384
break;
385
}
386
if(not add_environment(getplugin(NULL), envdef)){
387
perror("add_environment");
388
}
454
389
}
455
390
break;
456
391
case 'o': /* --options-for */
457
{
458
char *option_list = strchr(arg, ':');
459
if(option_list == NULL){
460
argp_error(state, "No colon in \"%s\"", arg);
461
errno = EINVAL;
462
break;
463
}
464
*option_list = '\0';
465
option_list++;
466
if(arg[0] == '\0'){
467
argp_error(state, "Empty plugin name");
468
errno = EINVAL;
469
break;
470
}
471
char *option;
472
while((option = strsep(&option_list, ",")) != NULL){
473
if(not add_argument(getplugin(arg), option)){
474
break;
392
if (arg != NULL){
393
char *p_name = strsep(&arg, ":");
394
if(p_name[0] == '\0'){
395
break;
396
}
397
char *opt = strsep(&arg, ":");
398
if(opt[0] == '\0'){
399
break;
400
}
401
if(opt != NULL){
402
char *p;
403
while((p = strsep(&opt, ",")) != NULL){
404
if(p[0] == '\0'){
405
continue;
406
}
407
if(not add_argument(getplugin(p_name), p)){
408
perror("add_argument");
409
return ARGP_ERR_UNKNOWN;
410
}
475
411
}
476
412
}
477
errno = 0;
478
413
}
479
414
break;
480
case 'E': /* --env-for */
415
case 'f': /* --envs-for */
416
if(arg == NULL){
417
break;
418
}
481
419
{
482
420
char *envdef = strchr(arg, ':');
483
421
if(envdef == NULL){
484
argp_error(state, "No colon in \"%s\"", arg);
485
errno = EINVAL;
486
break;
487
}
488
*envdef = '\0';
422
break;
423
}
424
char *p_name = strndup(arg, (size_t) (envdef-arg));
425
if(p_name == NULL){
426
break;
427
}
489
428
envdef++;
490
if(arg[0] == '\0'){
491
argp_error(state, "Empty plugin name");
492
errno = EINVAL;
493
break;
494
}
495
if(add_environment(getplugin(arg), envdef, true)){
496
errno = 0;
429
if(not add_environment(getplugin(p_name), envdef)){
430
perror("add_environment");
497
431
}
498
432
}
499
433
break;
500
434
case 'd': /* --disable */
501
{
502
plugin *p = getplugin(arg);
503
if(p != NULL){
504
p->disabled = true;
505
errno = 0;
506
}
507
}
508
break;
509
case 'e': /* --enable */
510
{
511
plugin *p = getplugin(arg);
512
if(p != NULL){
513
p->disabled = false;
514
errno = 0;
515
}
435
if (arg != NULL){
436
plugin *p = getplugin(arg);
437
if(p == NULL){
438
return ARGP_ERR_UNKNOWN;
439
}
440
p->disabled = true;
516
441
}
517
442
break;
518
443
case 128: /* --plugin-dir */
519
free(plugindir);
520
444
plugindir = strdup(arg);
521
if(plugindir != NULL){
522
errno = 0;
523
}
445
if(plugindir == NULL){
446
perror("strdup");
447
}
524
448
break;
525
449
case 129: /* --config-file */
526
/* This is already done by parse_opt_config_file() */
527
break;
450
argfile = strdup(arg);
451
if(argfile == NULL){
452
perror("strdup");
453
}
454
break;
528
455
case 130: /* --userid */
529
tmp_id = strtoimax(arg, &tmp, 10);
530
if(errno != 0 or tmp == arg or *tmp != '\0'
531
or tmp_id != (uid_t)tmp_id){
532
argp_error(state, "Bad user ID number: \"%s\", using %"
533
PRIdMAX, arg, (intmax_t)uid);
534
break;
535
}
536
uid = (uid_t)tmp_id;
537
errno = 0;
456
uid = (uid_t)strtol(arg, NULL, 10);
538
457
break;
539
458
case 131: /* --groupid */
540
tmp_id = strtoimax(arg, &tmp, 10);
541
if(errno != 0 or tmp == arg or *tmp != '\0'
542
or tmp_id != (gid_t)tmp_id){
543
argp_error(state, "Bad group ID number: \"%s\", using %"
544
PRIdMAX, arg, (intmax_t)gid);
545
break;
546
}
547
gid = (gid_t)tmp_id;
548
errno = 0;
459
gid = (gid_t)strtol(arg, NULL, 10);
549
460
break;
550
461
case 132: /* --debug */
551
462
debug = true;
552
463
break;
553
case 133: /* --plugin-helper-dir */
554
free(pluginhelperdir);
555
pluginhelperdir = strdup(arg);
556
if(pluginhelperdir != NULL){
557
errno = 0;
558
}
559
break;
560
/*
561
* These reproduce what we would get without ARGP_NO_HELP
562
*/
563
case '?': /* --help */
564
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
565
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
566
case -3: /* --usage */
567
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
568
argp_state_help(state, state->out_stream,
569
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
570
case 'V': /* --version */
571
fprintf(state->out_stream, "%s\n", argp_program_version);
572
exit(EXIT_SUCCESS);
573
break;
574
/*
575
* When adding more options before this line, remember to also add a
576
* "case" to the "parse_opt_config_file" function below.
577
*/
578
case ARGP_KEY_ARG:
579
/* Cryptsetup always passes an argument, which is an empty
580
string if "none" was specified in /etc/crypttab. So if
581
argument was empty, we ignore it silently. */
582
if(arg[0] == '\0'){
583
break;
584
}
585
default:
586
return ARGP_ERR_UNKNOWN;
587
}
588
return errno; /* Set to 0 at start */
589
}
590
591
/* This option parser is the same as parse_opt() above, except it
592
ignores everything but the --config-file option. */
593
error_t parse_opt_config_file(int key, char *arg,
594
__attribute__((unused))
595
struct argp_state *state){
596
errno = 0;
597
switch(key){
598
case 'g': /* --global-options */
599
case 'G': /* --global-env */
600
case 'o': /* --options-for */
601
case 'E': /* --env-for */
602
case 'd': /* --disable */
603
case 'e': /* --enable */
604
case 128: /* --plugin-dir */
605
break;
606
case 129: /* --config-file */
607
free(argfile);
608
argfile = strdup(arg);
609
if(argfile != NULL){
610
errno = 0;
611
}
612
break;
613
case 130: /* --userid */
614
case 131: /* --groupid */
615
case 132: /* --debug */
616
case 133: /* --plugin-helper-dir */
617
case '?': /* --help */
618
case -3: /* --usage */
619
case 'V': /* --version */
620
case ARGP_KEY_ARG:
621
break;
622
default:
623
return ARGP_ERR_UNKNOWN;
624
}
625
return errno;
626
}
627
628
struct argp argp = { .options = options,
629
.parser = parse_opt_config_file,
630
.args_doc = "",
464
case ARGP_KEY_ARG:
465
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
466
break;
467
case ARGP_KEY_END:
468
break;
469
default:
470
return ARGP_ERR_UNKNOWN;
471
}
472
return 0;
473
}
474
475
struct argp argp = { .options = options, .parser = parse_opt,
476
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
631
477
.doc = "Mandos plugin runner -- Run plugins" };
632
478
633
/* Parse using parse_opt_config_file() in order to get the custom
634
config file location, if any. */
635
ret = argp_parse(&argp, argc, argv,
636
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
637
NULL, NULL);
638
switch(ret){
639
case 0:
640
break;
641
case ENOMEM:
642
default:
643
errno = ret;
644
error(0, errno, "argp_parse");
645
exitstatus = EX_OSERR;
646
goto fallback;
647
case EINVAL:
648
exitstatus = EX_USAGE;
479
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
480
if (ret == ARGP_ERR_UNKNOWN){
481
fprintf(stderr, "Unknown error while parsing arguments\n");
482
exitstatus = EXIT_FAILURE;
649
483
goto fallback;
650
484
}
651
652
/* Reset to the normal argument parser */
653
argp.parser = parse_opt;
654
655
/* Open the configfile if available */
656
if(argfile == NULL){
485
486
/* Opens the configfile if aviable */
487
if (argfile == NULL){
657
488
conffp = fopen(AFILE, "r");
658
489
} else {
659
490
conffp = fopen(argfile, "r");
660
}
491
}
661
492
if(conffp != NULL){
662
493
char *org_line = NULL;
663
494
char *p, *arg, *new_arg, *line;
664
495
size_t size = 0;
496
ssize_t sret;
665
497
const char whitespace_delims[] = " \r\t\f\v\n";
666
498
const char comment_delim[] = "#";
667
499
668
500
custom_argc = 1;
669
501
custom_argv = malloc(sizeof(char*) * 2);
670
502
if(custom_argv == NULL){
671
error(0, errno, "malloc");
672
exitstatus = EX_OSERR;
503
perror("malloc");
504
exitstatus = EXIT_FAILURE;
673
505
goto fallback;
674
506
}
675
507
custom_argv[0] = argv[0];
676
508
custom_argv[1] = NULL;
677
678
/* for each line in the config file, strip whitespace and ignore
679
commented text */
509
510
/* for each line in the config file, strip whitespace and ignore commented text */
680
511
while(true){
681
512
sret = getline(&org_line, &size, conffp);
682
513
if(sret == -1){
683
514
break;
684
515
}
685
516
686
517
line = org_line;
687
518
arg = strsep(&line, comment_delim);
688
519
while((p = strsep(&arg, whitespace_delims)) != NULL){
691
522
}
692
523
new_arg = strdup(p);
693
524
if(new_arg == NULL){
694
error(0, errno, "strdup");
695
exitstatus = EX_OSERR;
525
perror("strdup");
526
exitstatus = EXIT_FAILURE;
696
527
free(org_line);
697
528
goto fallback;
698
529
}
699
530
700
531
custom_argc += 1;
701
{
702
char **new_argv = realloc(custom_argv, sizeof(char *)
703
* ((size_t)custom_argc + 1));
704
if(new_argv == NULL){
705
error(0, errno, "realloc");
706
exitstatus = EX_OSERR;
707
free(new_arg);
708
free(org_line);
709
goto fallback;
710
} else {
711
custom_argv = new_argv;
712
}
532
custom_argv = realloc(custom_argv, sizeof(char *)
533
* ((unsigned int) custom_argc + 1));
534
if(custom_argv == NULL){
535
perror("realloc");
536
exitstatus = EXIT_FAILURE;
537
free(org_line);
538
goto fallback;
713
539
}
714
540
custom_argv[custom_argc-1] = new_arg;
715
custom_argv[custom_argc] = NULL;
541
custom_argv[custom_argc] = NULL;
716
542
}
717
543
}
718
do {
719
ret = fclose(conffp);
720
} while(ret == EOF and errno == EINTR);
721
if(ret == EOF){
722
error(0, errno, "fclose");
723
exitstatus = EX_IOERR;
724
goto fallback;
725
}
726
544
free(org_line);
727
} else {
545
} else{
728
546
/* Check for harmful errors and go to fallback. Other errors might
729
547
not affect opening plugins */
730
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
731
error(0, errno, "fopen");
732
exitstatus = EX_OSERR;
548
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
549
perror("fopen");
550
exitstatus = EXIT_FAILURE;
733
551
goto fallback;
734
552
}
735
553
}
736
/* If there were any arguments from the configuration file, pass
737
them to parser as command line arguments */
554
/* If there was any arguments from configuration file,
555
pass them to parser as command arguments */
738
556
if(custom_argv != NULL){
739
ret = argp_parse(&argp, custom_argc, custom_argv,
740
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
741
NULL, NULL);
742
switch(ret){
743
case 0:
744
break;
745
case ENOMEM:
746
default:
747
errno = ret;
748
error(0, errno, "argp_parse");
749
exitstatus = EX_OSERR;
750
goto fallback;
751
case EINVAL:
752
exitstatus = EX_CONFIG;
753
goto fallback;
754
}
755
}
756
757
/* Parse actual command line arguments, to let them override the
758
config file */
759
ret = argp_parse(&argp, argc, argv,
760
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
761
NULL, NULL);
762
switch(ret){
763
case 0:
764
break;
765
case ENOMEM:
766
default:
767
errno = ret;
768
error(0, errno, "argp_parse");
769
exitstatus = EX_OSERR;
770
goto fallback;
771
case EINVAL:
772
exitstatus = EX_USAGE;
773
goto fallback;
774
}
775
776
{
777
char *pluginhelperenv;
778
bool bret = true;
779
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
780
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
781
if(ret != -1){
782
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
783
}
784
if(ret == -1 or not bret){
785
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
786
" environment variable to \"%s\" for all plugins\n",
787
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
788
}
789
if(ret != -1){
790
free(pluginhelperenv);
557
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
558
if (ret == ARGP_ERR_UNKNOWN){
559
fprintf(stderr, "Unknown error while parsing arguments\n");
560
exitstatus = EXIT_FAILURE;
561
goto fallback;
791
562
}
792
563
}
793
564
794
565
if(debug){
795
for(plugin *p = plugin_list; p != NULL; p = p->next){
566
for(plugin *p = plugin_list; p != NULL; p=p->next){
796
567
fprintf(stderr, "Plugin: %s has %d arguments\n",
797
568
p->name ? p->name : "Global", p->argc - 1);
798
569
for(char **a = p->argv; *a != NULL; a++){
799
570
fprintf(stderr, "\tArg: %s\n", *a);
800
571
}
801
fprintf(stderr, "...and %d environment variables\n", p->envc);
572
fprintf(stderr, "...and %u environment variables\n", p->envc);
802
573
for(char **a = p->environ; *a != NULL; a++){
803
574
fprintf(stderr, "\t%s\n", *a);
804
575
}
805
576
}
806
577
}
807
808
if(getuid() == 0){
809
/* Work around Debian bug #633582:
810
<https://bugs.debian.org/633582> */
811
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
812
if(plugindir_fd == -1){
813
if(errno != ENOENT){
814
error(0, errno, "open(\"" PDIR "\")");
815
}
816
} else {
817
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
818
if(ret == -1){
819
error(0, errno, "fstat");
820
} else {
821
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
822
ret = fchown(plugindir_fd, uid, gid);
823
if(ret == -1){
824
error(0, errno, "fchown");
825
}
826
}
827
}
828
close(plugindir_fd);
829
}
830
}
831
832
/* Lower permissions */
833
ret = setgid(gid);
834
if(ret == -1){
835
error(0, errno, "setgid");
836
}
578
579
/* Strip permissions down to nobody */
837
580
ret = setuid(uid);
838
if(ret == -1){
839
error(0, errno, "setuid");
840
}
841
842
/* Open plugin directory with close_on_exec flag */
581
if (ret == -1){
582
perror("setuid");
583
}
584
setgid(gid);
585
if (ret == -1){
586
perror("setgid");
587
}
588
589
if (plugindir == NULL){
590
dir = opendir(PDIR);
591
} else {
592
dir = opendir(plugindir);
593
}
594
595
if(dir == NULL){
596
perror("Could not open plugin dir");
597
exitstatus = EXIT_FAILURE;
598
goto fallback;
599
}
600
601
/* Set the FD_CLOEXEC flag on the directory, if possible */
843
602
{
844
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
845
#ifdef O_CLOEXEC
846
O_CLOEXEC
847
#else /* not O_CLOEXEC */
848
0
849
#endif /* not O_CLOEXEC */
850
);
851
if(dir_fd == -1){
852
error(0, errno, "Could not open plugin dir");
853
exitstatus = EX_UNAVAILABLE;
854
goto fallback;
855
}
856
857
#ifndef O_CLOEXEC
858
/* Set the FD_CLOEXEC flag on the directory */
859
ret = set_cloexec_flag(dir_fd);
860
if(ret < 0){
861
error(0, errno, "set_cloexec_flag");
862
exitstatus = EX_OSERR;
863
goto fallback;
864
}
865
#endif /* O_CLOEXEC */
866
}
867
868
int good_name(const struct dirent * const dirent){
869
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
870
"*.dpkg-old", "*.dpkg-bak",
871
"*.dpkg-divert", NULL };
872
#ifdef __GNUC__
873
#pragma GCC diagnostic push
874
#pragma GCC diagnostic ignored "-Wcast-qual"
875
#endif
876
for(const char **pat = (const char **)patterns;
877
*pat != NULL; pat++){
878
#ifdef __GNUC__
879
#pragma GCC diagnostic pop
880
#endif
881
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
882
!= FNM_NOMATCH){
883
if(debug){
884
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
885
" matching pattern %s\n", dirent->d_name, *pat);
886
}
887
return 0;
603
int dir_fd = dirfd(dir);
604
if(dir_fd >= 0){
605
ret = set_cloexec_flag(dir_fd);
606
if(ret < 0){
607
perror("set_cloexec_flag");
608
exitstatus = EXIT_FAILURE;
609
goto fallback;
888
610
}
889
611
}
890
return 1;
891
}
892
893
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
894
alphasort);
895
if(numplugins == -1){
896
error(0, errno, "Could not scan plugin dir");
897
direntries = NULL;
898
exitstatus = EX_OSERR;
899
goto fallback;
900
612
}
901
613
902
614
FD_ZERO(&rfds_all);
903
615
904
616
/* Read and execute any executable in the plugin directory*/
905
for(int i = 0; i < numplugins; i++){
906
907
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
908
if(plugin_fd == -1){
909
error(0, errno, "Could not open plugin");
910
free(direntries[i]);
911
continue;
912
}
913
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
914
if(ret == -1){
915
error(0, errno, "stat");
916
close(plugin_fd);
917
free(direntries[i]);
918
continue;
919
}
920
617
while(true){
618
dirst = readdir(dir);
619
620
// All directory entries have been processed
621
if(dirst == NULL){
622
if (errno == EBADF){
623
perror("readdir");
624
exitstatus = EXIT_FAILURE;
625
goto fallback;
626
}
627
break;
628
}
629
630
d_name_len = strlen(dirst->d_name);
631
632
// Ignore dotfiles, backup files and other junk
633
{
634
bool bad_name = false;
635
636
const char const *bad_prefixes[] = { ".", "#", NULL };
637
638
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
639
".dpkg-old",
640
".dpkg-divert", NULL };
641
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
642
size_t pre_len = strlen(*pre);
643
if((d_name_len >= pre_len)
644
and strncmp((dirst->d_name), *pre, pre_len) == 0){
645
if(debug){
646
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
647
" with bad prefix %s\n", dirst->d_name, *pre);
648
}
649
bad_name = true;
650
break;
651
}
652
}
653
if(bad_name){
654
continue;
655
}
656
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
657
size_t suf_len = strlen(*suf);
658
if((d_name_len >= suf_len)
659
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
660
== 0)){
661
if(debug){
662
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
663
" with bad suffix %s\n", dirst->d_name, *suf);
664
}
665
bad_name = true;
666
break;
667
}
668
}
669
670
if(bad_name){
671
continue;
672
}
673
}
674
675
char *filename;
676
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
677
if(ret < 0){
678
perror("asprintf");
679
continue;
680
}
681
682
ret = stat(filename, &st);
683
if (ret == -1){
684
perror("stat");
685
free(filename);
686
continue;
687
}
688
921
689
/* Ignore non-executable files */
922
if(not S_ISREG(st.st_mode)
923
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
924
X_OK, 0)) != 0)){
690
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
925
691
if(debug){
926
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
927
" with bad type or mode\n",
928
plugindir != NULL ? plugindir : PDIR,
929
direntries[i]->d_name);
692
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
693
" with bad type or mode\n", filename);
930
694
}
931
close(plugin_fd);
932
free(direntries[i]);
695
free(filename);
933
696
continue;
934
697
}
935
698
936
plugin *p = getplugin(direntries[i]->d_name);
699
plugin *p = getplugin(dirst->d_name);
937
700
if(p == NULL){
938
error(0, errno, "getplugin");
939
close(plugin_fd);
940
free(direntries[i]);
701
perror("getplugin");
702
free(filename);
941
703
continue;
942
704
}
943
705
if(p->disabled){
944
706
if(debug){
945
707
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
946
direntries[i]->d_name);
708
dirst->d_name);
947
709
}
948
close(plugin_fd);
949
free(direntries[i]);
710
free(filename);
950
711
continue;
951
712
}
952
713
{
955
716
if(g != NULL){
956
717
for(char **a = g->argv + 1; *a != NULL; a++){
957
718
if(not add_argument(p, *a)){
958
error(0, errno, "add_argument");
719
perror("add_argument");
959
720
}
960
721
}
961
722
/* Add global environment variables */
962
723
for(char **e = g->environ; *e != NULL; e++){
963
if(not add_environment(p, *e, false)){
964
error(0, errno, "add_environment");
724
if(not add_environment(p, *e)){
725
perror("add_environment");
965
726
}
966
727
}
967
728
}
968
729
}
969
/* If this plugin has any environment variables, we need to
970
duplicate the environment from this process, too. */
730
/* If this plugin has any environment variables, we will call
731
using execve and need to duplicate the environment from this
732
process, too. */
971
733
if(p->environ[0] != NULL){
972
734
for(char **e = environ; *e != NULL; e++){
973
if(not add_environment(p, *e, false)){
974
error(0, errno, "add_environment");
735
char *copy = strdup(*e);
736
if(copy == NULL){
737
perror("strdup");
738
continue;
739
}
740
if(not add_environment(p, copy)){
741
perror("add_environment");
975
742
}
976
743
}
977
744
}
978
745
979
746
int pipefd[2];
980
#ifndef O_CLOEXEC
981
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
982
#else /* O_CLOEXEC */
983
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
984
#endif /* O_CLOEXEC */
985
if(ret == -1){
986
error(0, errno, "pipe");
987
exitstatus = EX_OSERR;
988
free(direntries[i]);
989
goto fallback;
990
}
991
if(pipefd[0] >= FD_SETSIZE){
992
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
993
FD_SETSIZE);
994
close(pipefd[0]);
995
close(pipefd[1]);
996
exitstatus = EX_OSERR;
997
free(direntries[i]);
998
goto fallback;
999
}
1000
#ifndef O_CLOEXEC
747
ret = pipe(pipefd);
748
if (ret == -1){
749
perror("pipe");
750
exitstatus = EXIT_FAILURE;
751
goto fallback;
752
}
1001
753
/* Ask OS to automatic close the pipe on exec */
1002
754
ret = set_cloexec_flag(pipefd[0]);
1003
755
if(ret < 0){
1004
error(0, errno, "set_cloexec_flag");
1005
close(pipefd[0]);
1006
close(pipefd[1]);
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
756
perror("set_cloexec_flag");
757
exitstatus = EXIT_FAILURE;
1009
758
goto fallback;
1010
759
}
1011
760
ret = set_cloexec_flag(pipefd[1]);
1012
761
if(ret < 0){
1013
error(0, errno, "set_cloexec_flag");
1014
close(pipefd[0]);
1015
close(pipefd[1]);
1016
exitstatus = EX_OSERR;
1017
free(direntries[i]);
762
perror("set_cloexec_flag");
763
exitstatus = EXIT_FAILURE;
1018
764
goto fallback;
1019
765
}
1020
#endif /* not O_CLOEXEC */
1021
766
/* Block SIGCHLD until process is safely in process list */
1022
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1023
&sigchld_action.sa_mask,
1024
NULL));
767
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1025
768
if(ret < 0){
1026
error(0, errno, "sigprocmask");
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
769
perror("sigprocmask");
770
exitstatus = EXIT_FAILURE;
1029
771
goto fallback;
1030
772
}
1031
/* Starting a new process to be watched */
1032
pid_t pid;
1033
do {
1034
pid = fork();
1035
} while(pid == -1 and errno == EINTR);
773
// Starting a new process to be watched
774
pid_t pid = fork();
1036
775
if(pid == -1){
1037
error(0, errno, "fork");
1038
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1039
&sigchld_action.sa_mask, NULL));
1040
close(pipefd[0]);
1041
close(pipefd[1]);
1042
exitstatus = EX_OSERR;
1043
free(direntries[i]);
776
perror("fork");
777
exitstatus = EXIT_FAILURE;
1044
778
goto fallback;
1045
779
}
1046
780
if(pid == 0){
1047
781
/* this is the child process */
1048
782
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1049
783
if(ret < 0){
1050
error(0, errno, "sigaction");
1051
_exit(EX_OSERR);
784
perror("sigaction");
785
_exit(EXIT_FAILURE);
1052
786
}
1053
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
787
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1054
788
if(ret < 0){
1055
error(0, errno, "sigprocmask");
1056
_exit(EX_OSERR);
789
perror("sigprocmask");
790
_exit(EXIT_FAILURE);
1057
791
}
1058
792
1059
793
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1060
794
if(ret == -1){
1061
error(0, errno, "dup2");
1062
_exit(EX_OSERR);
795
perror("dup2");
796
_exit(EXIT_FAILURE);
1063
797
}
1064
798
1065
if(fexecve(plugin_fd, p->argv,
1066
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1067
error(0, errno, "fexecve for %s/%s",
1068
plugindir != NULL ? plugindir : PDIR,
1069
direntries[i]->d_name);
1070
_exit(EX_OSERR);
799
if(dirfd(dir) < 0){
800
/* If dir has no file descriptor, we could not set FD_CLOEXEC
801
above and must now close it manually here. */
802
closedir(dir);
803
}
804
if(p->environ[0] == NULL){
805
if(execv(filename, p->argv) < 0){
806
perror("execv");
807
_exit(EXIT_FAILURE);
808
}
809
} else {
810
if(execve(filename, p->argv, p->environ) < 0){
811
perror("execve");
812
_exit(EXIT_FAILURE);
813
}
1071
814
}
1072
815
/* no return */
1073
816
}
1074
817
/* Parent process */
1075
818
close(pipefd[1]); /* Close unused write end of pipe */
1076
close(plugin_fd);
1077
plugin *new_plugin = getplugin(direntries[i]->d_name);
1078
if(new_plugin == NULL){
1079
error(0, errno, "getplugin");
1080
ret = (int)(TEMP_FAILURE_RETRY
1081
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1082
NULL)));
819
free(filename);
820
plugin *new_plugin = getplugin(dirst->d_name);
821
if (new_plugin == NULL){
822
perror("getplugin");
823
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1083
824
if(ret < 0){
1084
error(0, errno, "sigprocmask");
825
perror("sigprocmask");
1085
826
}
1086
exitstatus = EX_OSERR;
1087
free(direntries[i]);
827
exitstatus = EXIT_FAILURE;
1088
828
goto fallback;
1089
829
}
1090
free(direntries[i]);
1091
830
1092
831
new_plugin->pid = pid;
1093
832
new_plugin->fd = pipefd[0];
1094
833
1095
834
/* Unblock SIGCHLD so signal handler can be run if this process
1096
835
has already completed */
1097
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1098
&sigchld_action.sa_mask,
1099
NULL));
836
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1100
837
if(ret < 0){
1101
error(0, errno, "sigprocmask");
1102
exitstatus = EX_OSERR;
838
perror("sigprocmask");
839
exitstatus = EXIT_FAILURE;
1103
840
goto fallback;
1104
841
}
1105
842
1106
843
FD_SET(new_plugin->fd, &rfds_all);
1107
844
1108
if(maxfd < new_plugin->fd){
845
if (maxfd < new_plugin->fd){
1109
846
maxfd = new_plugin->fd;
1110
847
}
848
1111
849
}
1112
850
1113
free(direntries);
1114
direntries = NULL;
1115
close(dir_fd);
1116
dir_fd = -1;
1117
free_plugin(getplugin(NULL));
1118
851
closedir(dir);
852
dir = NULL;
853
1119
854
for(plugin *p = plugin_list; p != NULL; p = p->next){
1120
855
if(p->pid != 0){
1121
856
break;
1126
861
free_plugin_list();
1127
862
}
1128
863
}
1129
864
1130
865
/* Main loop while running plugins exist */
1131
866
while(plugin_list){
1132
867
fd_set rfds = rfds_all;
1133
868
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1134
if(select_ret == -1 and errno != EINTR){
1135
error(0, errno, "select");
1136
exitstatus = EX_OSERR;
869
if (select_ret == -1){
870
perror("select");
871
exitstatus = EXIT_FAILURE;
1137
872
goto fallback;
1138
873
}
1139
874
/* OK, now either a process completed, or something can be read
1140
875
from one of them */
1141
for(plugin *proc = plugin_list; proc != NULL;){
876
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1142
877
/* Is this process completely done? */
1143
if(proc->completed and proc->eof){
878
if(proc->eof and proc->completed){
1144
879
/* Only accept the plugin output if it exited cleanly */
1145
880
if(not WIFEXITED(proc->status)
1146
881
or WEXITSTATUS(proc->status) != 0){
1147
882
/* Bad exit by plugin */
1148
883
1149
884
if(debug){
1150
885
if(WIFEXITED(proc->status)){
1151
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1152
" status %d\n", proc->name,
1153
(intmax_t) (proc->pid),
886
fprintf(stderr, "Plugin %u exited with status %d\n",
887
(unsigned int) (proc->pid),
1154
888
WEXITSTATUS(proc->status));
1155
} else if(WIFSIGNALED(proc->status)){
1156
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1157
" signal %d: %s\n", proc->name,
1158
(intmax_t) (proc->pid),
1159
WTERMSIG(proc->status),
1160
strsignal(WTERMSIG(proc->status)));
889
} else if(WIFSIGNALED(proc->status)) {
890
fprintf(stderr, "Plugin %u killed by signal %d\n",
891
(unsigned int) (proc->pid),
892
WTERMSIG(proc->status));
893
} else if(WCOREDUMP(proc->status)){
894
fprintf(stderr, "Plugin %d dumped core\n",
895
(unsigned int) (proc->pid));
1161
896
}
1162
897
}
1163
898
1164
899
/* Remove the plugin */
1165
900
FD_CLR(proc->fd, &rfds_all);
1166
901
1167
902
/* Block signal while modifying process_list */
1168
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1169
(SIG_BLOCK,
1170
&sigchld_action.sa_mask,
1171
NULL));
903
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1172
904
if(ret < 0){
1173
error(0, errno, "sigprocmask");
1174
exitstatus = EX_OSERR;
905
perror("sigprocmask");
906
exitstatus = EXIT_FAILURE;
1175
907
goto fallback;
1176
908
}
1177
1178
plugin *next_plugin = proc->next;
1179
909
free_plugin(proc);
1180
proc = next_plugin;
1181
1182
910
/* We are done modifying process list, so unblock signal */
1183
ret = (int)(TEMP_FAILURE_RETRY
1184
(sigprocmask(SIG_UNBLOCK,
1185
&sigchld_action.sa_mask, NULL)));
911
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
912
NULL);
1186
913
if(ret < 0){
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
914
perror("sigprocmask");
915
exitstatus = EXIT_FAILURE;
1189
916
goto fallback;
1190
917
}
1191
918
1192
919
if(plugin_list == NULL){
1193
920
break;
1194
921
}
1195
1196
922
continue;
1197
923
}
1198
924
1199
925
/* This process exited nicely, so print its buffer */
1200
926
1201
927
bool bret = print_out_password(proc->buffer,
1202
928
proc->buffer_length);
1203
929
if(not bret){
1204
error(0, errno, "print_out_password");
1205
exitstatus = EX_IOERR;
930
perror("print_out_password");
931
exitstatus = EXIT_FAILURE;
1206
932
}
1207
933
goto fallback;
1208
934
}
1210
936
/* This process has not completed. Does it have any output? */
1211
937
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1212
938
/* This process had nothing to say at this time */
1213
proc = proc->next;
1214
939
continue;
1215
940
}
1216
941
/* Before reading, make the process' data buffer large enough */
1217
942
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1218
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1219
+ (size_t) BUFFER_SIZE);
1220
if(new_buffer == NULL){
1221
error(0, errno, "malloc");
1222
exitstatus = EX_OSERR;
943
proc->buffer = realloc(proc->buffer, proc->buffer_size
944
+ (size_t) BUFFER_SIZE);
945
if (proc->buffer == NULL){
946
perror("malloc");
947
exitstatus = EXIT_FAILURE;
1223
948
goto fallback;
1224
949
}
1225
proc->buffer = new_buffer;
1226
950
proc->buffer_size += BUFFER_SIZE;
1227
951
}
1228
952
/* Read from the process */
1229
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1230
proc->buffer
1231
+ proc->buffer_length,
1232
BUFFER_SIZE));
1233
if(sret < 0){
953
ret = read(proc->fd, proc->buffer + proc->buffer_length,
954
BUFFER_SIZE);
955
if(ret < 0){
1234
956
/* Read error from this process; ignore the error */
1235
proc = proc->next;
1236
957
continue;
1237
958
}
1238
if(sret == 0){
959
if(ret == 0){
1239
960
/* got EOF */
1240
961
proc->eof = true;
1241
962
} else {
1242
proc->buffer_length += (size_t) sret;
963
proc->buffer_length += (size_t) ret;
1243
964
}
1244
965
}
1245
966
}
1246
1247
967
968
1248
969
fallback:
1249
970
1250
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1251
and exitstatus != EX_OK)){
971
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1252
972
/* Fallback if all plugins failed, none are found or an error
1253
973
occured */
1254
974
bool bret;
1255
975
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1256
976
char *passwordbuffer = getpass("Password: ");
1257
size_t len = strlen(passwordbuffer);
1258
/* Strip trailing newline */
1259
if(len > 0 and passwordbuffer[len-1] == '\n'){
1260
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1261
len--;
1262
}
1263
bret = print_out_password(passwordbuffer, len);
977
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1264
978
if(not bret){
1265
error(0, errno, "print_out_password");
1266
exitstatus = EX_IOERR;
979
perror("print_out_password");
980
exitstatus = EXIT_FAILURE;
1267
981
}
1268
982
}
1269
983
1270
984
/* Restore old signal handler */
1271
985
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1272
986
if(ret == -1){
1273
error(0, errno, "sigaction");
1274
exitstatus = EX_OSERR;
987
perror("sigaction");
988
exitstatus = EXIT_FAILURE;
1275
989
}
1276
990
1277
991
if(custom_argv != NULL){
1278
992
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1279
993
free(*arg);
1281
995
free(custom_argv);
1282
996
}
1283
997
1284
free(direntries);
1285
1286
if(dir_fd != -1){
1287
close(dir_fd);
998
if(dir != NULL){
999
closedir(dir);
1288
1000
}
1289
1001
1290
/* Kill the processes */
1002
/* Free the process list and kill the processes */
1291
1003
for(plugin *p = plugin_list; p != NULL; p = p->next){
1292
1004
if(p->pid != 0){
1293
1005
close(p->fd);
1294
1006
ret = kill(p->pid, SIGTERM);
1295
1007
if(ret == -1 and errno != ESRCH){
1296
1008
/* Set-uid proccesses might not get closed */
1297
error(0, errno, "kill");
1009
perror("kill");
1298
1010
}
1299
1011
}
1300
1012
}
1301
1013
1302
1014
/* Wait for any remaining child processes to terminate */
1303
do {
1015
do{
1304
1016
ret = wait(NULL);
1305
1017
} while(ret >= 0);
1306
1018
if(errno != ECHILD){
1307
error(0, errno, "wait");
1019
perror("wait");
1308
1020
}
1309
1021
1310
1022
free_plugin_list();
1311
1023
1312
1024
free(plugindir);
1313
free(pluginhelperdir);
1314
1025
free(argfile);
1315
1026
1316
1027
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0