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- Committer: Teddy Hogeborn
- Date: 2008-09-05 18:19:52 UTC
- mfrom: (24.1.91 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080905181952-qfuwtyvefanh9v3v
* mandos: Open the PID file before daemonizing, but write to it
afterwards.
* plugin-runner.xml (SECURITY): Improved grammar.
Also merge.
afterwards.
* plugin-runner.xml (SECURITY): Improved grammar.
Also 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 © 2008-2015 Teddy Hogeborn
6
* Copyright © 2008-2015 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
WCOREDUMP() */
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
106
98
107
99
/* Gets an 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
121
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
143
126
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;
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) + 1);
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 */
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;
476
}
477
}
478
errno = 0;
411
if (arg != NULL){
412
char *p_name = strsep(&arg, ":");
413
if(p_name[0] == '\0' or arg == NULL){
414
break;
415
}
416
char *opt = strsep(&arg, ":");
417
if(opt[0] == '\0' or opt == NULL){
418
break;
419
}
420
char *p;
421
while((p = strsep(&opt, ",")) != NULL){
422
if(p[0] == '\0'){
423
continue;
424
}
425
if(not add_argument(getplugin(p_name), p)){
426
perror("add_argument");
427
return ARGP_ERR_UNKNOWN;
428
}
429
}
479
430
}
480
431
break;
481
432
case 'E': /* --env-for */
433
if(arg == NULL){
434
break;
435
}
482
436
{
483
437
char *envdef = strchr(arg, ':');
484
438
if(envdef == NULL){
485
argp_error(state, "No colon in \"%s\"", arg);
486
errno = EINVAL;
487
break;
488
}
489
*envdef = '\0';
439
break;
440
}
441
char *p_name = strndup(arg, (size_t) (envdef-arg));
442
if(p_name == NULL){
443
break;
444
}
490
445
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;
446
if(not add_environment(getplugin(p_name), envdef, true)){
447
perror("add_environment");
498
448
}
499
449
}
500
450
break;
501
451
case 'd': /* --disable */
502
{
452
if (arg != NULL){
503
453
plugin *p = getplugin(arg);
504
if(p != NULL){
505
p->disabled = true;
506
errno = 0;
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
507
456
}
457
p->disabled = true;
508
458
}
509
459
break;
510
460
case 'e': /* --enable */
511
{
461
if (arg != NULL){
512
462
plugin *p = getplugin(arg);
513
if(p != NULL){
514
p->disabled = false;
515
errno = 0;
463
if(p == NULL){
464
return ARGP_ERR_UNKNOWN;
516
465
}
466
p->disabled = false;
517
467
}
518
468
break;
519
469
case 128: /* --plugin-dir */
520
free(plugindir);
521
470
plugindir = strdup(arg);
522
if(plugindir != NULL){
523
errno = 0;
524
}
471
if(plugindir == NULL){
472
perror("strdup");
473
}
525
474
break;
526
475
case 129: /* --config-file */
527
476
/* This is already done by parse_opt_config_file() */
528
477
break;
529
478
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;
479
uid = (uid_t)strtol(arg, NULL, 10);
539
480
break;
540
481
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;
482
gid = (gid_t)strtol(arg, NULL, 10);
550
483
break;
551
484
case 132: /* --debug */
552
485
debug = true;
553
486
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
487
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
}
488
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
489
break;
490
case ARGP_KEY_END:
491
break;
586
492
default:
587
493
return ARGP_ERR_UNKNOWN;
588
494
}
589
return errno; /* Set to 0 at start */
495
return 0;
590
496
}
591
497
592
498
/* This option parser is the same as parse_opt() above, except it
593
499
ignores everything but the --config-file option. */
594
error_t parse_opt_config_file(int key, char *arg,
595
__attribute__((unused))
596
struct argp_state *state){
597
errno = 0;
598
switch(key){
500
error_t parse_opt_config_file (int key, char *arg,
501
__attribute__((unused))
502
struct argp_state *state) {
503
switch (key) {
599
504
case 'g': /* --global-options */
600
505
case 'G': /* --global-env */
601
506
case 'o': /* --options-for */
605
510
case 128: /* --plugin-dir */
606
511
break;
607
512
case 129: /* --config-file */
608
free(argfile);
609
513
argfile = strdup(arg);
610
if(argfile != NULL){
611
errno = 0;
514
if(argfile == NULL){
515
perror("strdup");
612
516
}
613
break;
517
break;
614
518
case 130: /* --userid */
615
519
case 131: /* --groupid */
616
520
case 132: /* --debug */
617
case 133: /* --plugin-helper-dir */
618
case '?': /* --help */
619
case -3: /* --usage */
620
case 'V': /* --version */
621
521
case ARGP_KEY_ARG:
522
case ARGP_KEY_END:
622
523
break;
623
524
default:
624
525
return ARGP_ERR_UNKNOWN;
625
526
}
626
return errno;
527
return 0;
627
528
}
628
529
629
530
struct argp argp = { .options = options,
631
532
.args_doc = "",
632
533
.doc = "Mandos plugin runner -- Run plugins" };
633
534
634
/* Parse using parse_opt_config_file() in order to get the custom
535
/* Parse using the parse_opt_config_file in order to get the custom
635
536
config file location, if any. */
636
ret = argp_parse(&argp, argc, argv,
637
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
638
NULL, NULL);
639
switch(ret){
640
case 0:
641
break;
642
case ENOMEM:
643
default:
644
errno = ret;
645
error(0, errno, "argp_parse");
646
exitstatus = EX_OSERR;
647
goto fallback;
648
case EINVAL:
649
exitstatus = EX_USAGE;
537
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
538
if (ret == ARGP_ERR_UNKNOWN){
539
fprintf(stderr, "Unknown error while parsing arguments\n");
540
exitstatus = EXIT_FAILURE;
650
541
goto fallback;
651
542
}
652
543
654
545
argp.parser = parse_opt;
655
546
656
547
/* Open the configfile if available */
657
if(argfile == NULL){
548
if (argfile == NULL){
658
549
conffp = fopen(AFILE, "r");
659
550
} else {
660
551
conffp = fopen(argfile, "r");
661
}
552
}
662
553
if(conffp != NULL){
663
554
char *org_line = NULL;
664
555
char *p, *arg, *new_arg, *line;
665
556
size_t size = 0;
557
ssize_t sret;
666
558
const char whitespace_delims[] = " \r\t\f\v\n";
667
559
const char comment_delim[] = "#";
668
560
669
561
custom_argc = 1;
670
562
custom_argv = malloc(sizeof(char*) * 2);
671
563
if(custom_argv == NULL){
672
error(0, errno, "malloc");
673
exitstatus = EX_OSERR;
564
perror("malloc");
565
exitstatus = EXIT_FAILURE;
674
566
goto fallback;
675
567
}
676
568
custom_argv[0] = argv[0];
677
569
custom_argv[1] = NULL;
678
570
679
571
/* for each line in the config file, strip whitespace and ignore
680
572
commented text */
681
573
while(true){
683
575
if(sret == -1){
684
576
break;
685
577
}
686
578
687
579
line = org_line;
688
580
arg = strsep(&line, comment_delim);
689
581
while((p = strsep(&arg, whitespace_delims)) != NULL){
692
584
}
693
585
new_arg = strdup(p);
694
586
if(new_arg == NULL){
695
error(0, errno, "strdup");
696
exitstatus = EX_OSERR;
587
perror("strdup");
588
exitstatus = EXIT_FAILURE;
697
589
free(org_line);
698
590
goto fallback;
699
591
}
700
592
701
593
custom_argc += 1;
702
{
703
char **new_argv = realloc(custom_argv, sizeof(char *)
704
* ((unsigned int)
705
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
}
594
custom_argv = realloc(custom_argv, sizeof(char *)
595
* ((unsigned int) custom_argc + 1));
596
if(custom_argv == NULL){
597
perror("realloc");
598
exitstatus = EXIT_FAILURE;
599
free(org_line);
600
goto fallback;
715
601
}
716
602
custom_argv[custom_argc-1] = new_arg;
717
custom_argv[custom_argc] = NULL;
603
custom_argv[custom_argc] = NULL;
718
604
}
719
605
}
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
606
free(org_line);
729
607
} else {
730
608
/* Check for harmful errors and go to fallback. Other errors might
731
609
not affect opening plugins */
732
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
733
error(0, errno, "fopen");
734
exitstatus = EX_OSERR;
610
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
611
perror("fopen");
612
exitstatus = EXIT_FAILURE;
735
613
goto fallback;
736
614
}
737
615
}
738
/* If there were any arguments from the configuration file, pass
739
them to parser as command line arguments */
616
/* If there was any arguments from configuration file,
617
pass them to parser as command arguments */
740
618
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;
619
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
620
0, NULL);
621
if (ret == ARGP_ERR_UNKNOWN){
622
fprintf(stderr, "Unknown error while parsing arguments\n");
623
exitstatus = EXIT_FAILURE;
755
624
goto fallback;
756
625
}
757
626
}
758
627
759
628
/* Parse actual command line arguments, to let them override the
760
629
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
}
630
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
631
if (ret == ARGP_ERR_UNKNOWN){
632
fprintf(stderr, "Unknown error while parsing arguments\n");
633
exitstatus = EXIT_FAILURE;
634
goto fallback;
794
635
}
795
636
796
637
if(debug){
800
641
for(char **a = p->argv; *a != NULL; a++){
801
642
fprintf(stderr, "\tArg: %s\n", *a);
802
643
}
803
fprintf(stderr, "...and %d environment variables\n", p->envc);
644
fprintf(stderr, "...and %u environment variables\n", p->envc);
804
645
for(char **a = p->environ; *a != NULL; a++){
805
646
fprintf(stderr, "\t%s\n", *a);
806
647
}
807
648
}
808
649
}
809
650
810
if(getuid() == 0){
811
/* Work around Debian bug #633582:
812
<http://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
}
651
/* Strip permissions down to nobody */
839
652
ret = setuid(uid);
840
if(ret == -1){
841
error(0, errno, "setuid");
842
}
843
844
/* Open plugin directory with close_on_exec flag */
653
if (ret == -1){
654
perror("setuid");
655
}
656
setgid(gid);
657
if (ret == -1){
658
perror("setgid");
659
}
660
661
if (plugindir == NULL){
662
dir = opendir(PDIR);
663
} else {
664
dir = opendir(plugindir);
665
}
666
667
if(dir == NULL){
668
perror("Could not open plugin dir");
669
exitstatus = EXIT_FAILURE;
670
goto fallback;
671
}
672
673
/* Set the FD_CLOEXEC flag on the directory, if possible */
845
674
{
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;
675
int dir_fd = dirfd(dir);
676
if(dir_fd >= 0){
677
ret = set_cloexec_flag(dir_fd);
678
if(ret < 0){
679
perror("set_cloexec_flag");
680
exitstatus = EXIT_FAILURE;
681
goto fallback;
890
682
}
891
683
}
892
return 1;
893
}
894
895
#ifdef __GLIBC__
896
#if __GLIBC_PREREQ(2, 15)
897
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
898
alphasort);
899
#else /* not __GLIBC_PREREQ(2, 15) */
900
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
901
&direntries, good_name, alphasort);
902
#endif /* not __GLIBC_PREREQ(2, 15) */
903
#else /* not __GLIBC__ */
904
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
905
&direntries, good_name, alphasort);
906
#endif /* not __GLIBC__ */
907
if(numplugins == -1){
908
error(0, errno, "Could not scan plugin dir");
909
direntries = NULL;
910
exitstatus = EX_OSERR;
911
goto fallback;
912
684
}
913
685
914
686
FD_ZERO(&rfds_all);
915
687
916
688
/* Read and execute any executable in the plugin directory*/
917
for(int i = 0; i < numplugins; i++){
918
919
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
920
if(plugin_fd == -1){
921
error(0, errno, "Could not open plugin");
922
free(direntries[i]);
923
continue;
924
}
925
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
926
if(ret == -1){
927
error(0, errno, "stat");
928
close(plugin_fd);
929
free(direntries[i]);
930
continue;
931
}
932
689
while(true){
690
dirst = readdir(dir);
691
692
/* All directory entries have been processed */
693
if(dirst == NULL){
694
if (errno == EBADF){
695
perror("readdir");
696
exitstatus = EXIT_FAILURE;
697
goto fallback;
698
}
699
break;
700
}
701
702
d_name_len = strlen(dirst->d_name);
703
704
/* Ignore dotfiles, backup files and other junk */
705
{
706
bool bad_name = false;
707
708
const char const *bad_prefixes[] = { ".", "#", NULL };
709
710
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
711
".dpkg-old",
712
".dpkg-divert", NULL };
713
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
714
size_t pre_len = strlen(*pre);
715
if((d_name_len >= pre_len)
716
and strncmp((dirst->d_name), *pre, pre_len) == 0){
717
if(debug){
718
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
719
" with bad prefix %s\n", dirst->d_name, *pre);
720
}
721
bad_name = true;
722
break;
723
}
724
}
725
if(bad_name){
726
continue;
727
}
728
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
729
size_t suf_len = strlen(*suf);
730
if((d_name_len >= suf_len)
731
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
732
== 0)){
733
if(debug){
734
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
735
" with bad suffix %s\n", dirst->d_name, *suf);
736
}
737
bad_name = true;
738
break;
739
}
740
}
741
742
if(bad_name){
743
continue;
744
}
745
}
746
747
char *filename;
748
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
749
if(ret < 0){
750
perror("asprintf");
751
continue;
752
}
753
754
ret = stat(filename, &st);
755
if (ret == -1){
756
perror("stat");
757
free(filename);
758
continue;
759
}
760
933
761
/* Ignore non-executable files */
934
if(not S_ISREG(st.st_mode)
935
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
936
X_OK, 0)) != 0)){
762
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
937
763
if(debug){
938
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
939
" with bad type or mode\n",
940
plugindir != NULL ? plugindir : PDIR,
941
direntries[i]->d_name);
764
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
765
" with bad type or mode\n", filename);
942
766
}
943
close(plugin_fd);
944
free(direntries[i]);
767
free(filename);
945
768
continue;
946
769
}
947
770
948
plugin *p = getplugin(direntries[i]->d_name);
771
plugin *p = getplugin(dirst->d_name);
949
772
if(p == NULL){
950
error(0, errno, "getplugin");
951
close(plugin_fd);
952
free(direntries[i]);
773
perror("getplugin");
774
free(filename);
953
775
continue;
954
776
}
955
777
if(p->disabled){
956
778
if(debug){
957
779
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
958
direntries[i]->d_name);
780
dirst->d_name);
959
781
}
960
close(plugin_fd);
961
free(direntries[i]);
782
free(filename);
962
783
continue;
963
784
}
964
785
{
967
788
if(g != NULL){
968
789
for(char **a = g->argv + 1; *a != NULL; a++){
969
790
if(not add_argument(p, *a)){
970
error(0, errno, "add_argument");
791
perror("add_argument");
971
792
}
972
793
}
973
794
/* Add global environment variables */
974
795
for(char **e = g->environ; *e != NULL; e++){
975
796
if(not add_environment(p, *e, false)){
976
error(0, errno, "add_environment");
797
perror("add_environment");
977
798
}
978
799
}
979
800
}
980
801
}
981
/* If this plugin has any environment variables, we need to
982
duplicate the environment from this process, too. */
802
/* If this plugin has any environment variables, we will call
803
using execve and need to duplicate the environment from this
804
process, too. */
983
805
if(p->environ[0] != NULL){
984
806
for(char **e = environ; *e != NULL; e++){
985
807
if(not add_environment(p, *e, false)){
986
error(0, errno, "add_environment");
808
perror("add_environment");
987
809
}
988
810
}
989
811
}
990
812
991
813
int pipefd[2];
992
#ifndef O_CLOEXEC
993
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
994
#else /* O_CLOEXEC */
995
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
996
#endif /* O_CLOEXEC */
997
if(ret == -1){
998
error(0, errno, "pipe");
999
exitstatus = EX_OSERR;
1000
free(direntries[i]);
1001
goto fallback;
1002
}
1003
if(pipefd[0] >= FD_SETSIZE){
1004
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1005
FD_SETSIZE);
1006
close(pipefd[0]);
1007
close(pipefd[1]);
1008
exitstatus = EX_OSERR;
1009
free(direntries[i]);
1010
goto fallback;
1011
}
1012
#ifndef O_CLOEXEC
814
ret = pipe(pipefd);
815
if (ret == -1){
816
perror("pipe");
817
exitstatus = EXIT_FAILURE;
818
goto fallback;
819
}
1013
820
/* Ask OS to automatic close the pipe on exec */
1014
821
ret = set_cloexec_flag(pipefd[0]);
1015
822
if(ret < 0){
1016
error(0, errno, "set_cloexec_flag");
1017
close(pipefd[0]);
1018
close(pipefd[1]);
1019
exitstatus = EX_OSERR;
1020
free(direntries[i]);
823
perror("set_cloexec_flag");
824
exitstatus = EXIT_FAILURE;
1021
825
goto fallback;
1022
826
}
1023
827
ret = set_cloexec_flag(pipefd[1]);
1024
828
if(ret < 0){
1025
error(0, errno, "set_cloexec_flag");
1026
close(pipefd[0]);
1027
close(pipefd[1]);
1028
exitstatus = EX_OSERR;
1029
free(direntries[i]);
829
perror("set_cloexec_flag");
830
exitstatus = EXIT_FAILURE;
1030
831
goto fallback;
1031
832
}
1032
#endif /* not O_CLOEXEC */
1033
833
/* Block SIGCHLD until process is safely in process list */
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1035
&sigchld_action.sa_mask,
1036
NULL));
834
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1037
835
if(ret < 0){
1038
error(0, errno, "sigprocmask");
1039
exitstatus = EX_OSERR;
1040
free(direntries[i]);
836
perror("sigprocmask");
837
exitstatus = EXIT_FAILURE;
1041
838
goto fallback;
1042
839
}
1043
840
/* Starting a new process to be watched */
1044
pid_t pid;
1045
do {
1046
pid = fork();
1047
} while(pid == -1 and errno == EINTR);
841
pid_t pid = fork();
1048
842
if(pid == -1){
1049
error(0, errno, "fork");
1050
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1051
&sigchld_action.sa_mask, NULL));
1052
close(pipefd[0]);
1053
close(pipefd[1]);
1054
exitstatus = EX_OSERR;
1055
free(direntries[i]);
843
perror("fork");
844
exitstatus = EXIT_FAILURE;
1056
845
goto fallback;
1057
846
}
1058
847
if(pid == 0){
1059
848
/* this is the child process */
1060
849
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1061
850
if(ret < 0){
1062
error(0, errno, "sigaction");
1063
_exit(EX_OSERR);
851
perror("sigaction");
852
_exit(EXIT_FAILURE);
1064
853
}
1065
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
854
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1066
855
if(ret < 0){
1067
error(0, errno, "sigprocmask");
1068
_exit(EX_OSERR);
856
perror("sigprocmask");
857
_exit(EXIT_FAILURE);
1069
858
}
1070
859
1071
860
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1072
861
if(ret == -1){
1073
error(0, errno, "dup2");
1074
_exit(EX_OSERR);
862
perror("dup2");
863
_exit(EXIT_FAILURE);
1075
864
}
1076
865
1077
if(fexecve(plugin_fd, p->argv,
1078
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1079
error(0, errno, "fexecve for %s/%s",
1080
plugindir != NULL ? plugindir : PDIR,
1081
direntries[i]->d_name);
1082
_exit(EX_OSERR);
866
if(dirfd(dir) < 0){
867
/* If dir has no file descriptor, we could not set FD_CLOEXEC
868
above and must now close it manually here. */
869
closedir(dir);
870
}
871
if(p->environ[0] == NULL){
872
if(execv(filename, p->argv) < 0){
873
perror("execv");
874
_exit(EXIT_FAILURE);
875
}
876
} else {
877
if(execve(filename, p->argv, p->environ) < 0){
878
perror("execve");
879
_exit(EXIT_FAILURE);
880
}
1083
881
}
1084
882
/* no return */
1085
883
}
1086
884
/* Parent process */
1087
885
close(pipefd[1]); /* Close unused write end of pipe */
1088
close(plugin_fd);
1089
plugin *new_plugin = getplugin(direntries[i]->d_name);
1090
if(new_plugin == NULL){
1091
error(0, errno, "getplugin");
1092
ret = (int)(TEMP_FAILURE_RETRY
1093
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1094
NULL)));
886
free(filename);
887
plugin *new_plugin = getplugin(dirst->d_name);
888
if (new_plugin == NULL){
889
perror("getplugin");
890
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1095
891
if(ret < 0){
1096
error(0, errno, "sigprocmask");
892
perror("sigprocmask");
1097
893
}
1098
exitstatus = EX_OSERR;
1099
free(direntries[i]);
894
exitstatus = EXIT_FAILURE;
1100
895
goto fallback;
1101
896
}
1102
free(direntries[i]);
1103
897
1104
898
new_plugin->pid = pid;
1105
899
new_plugin->fd = pipefd[0];
1106
900
1107
901
/* Unblock SIGCHLD so signal handler can be run if this process
1108
902
has already completed */
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1110
&sigchld_action.sa_mask,
1111
NULL));
903
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1112
904
if(ret < 0){
1113
error(0, errno, "sigprocmask");
1114
exitstatus = EX_OSERR;
905
perror("sigprocmask");
906
exitstatus = EXIT_FAILURE;
1115
907
goto fallback;
1116
908
}
1117
909
1118
#if defined (__GNUC__) and defined (__GLIBC__)
1119
#if not __GLIBC_PREREQ(2, 16)
1120
#pragma GCC diagnostic push
1121
#pragma GCC diagnostic ignored "-Wsign-conversion"
1122
#endif
1123
#endif
1124
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1125
-Wconversion in GNU libc
1126
before 2.16 */
1127
#if defined (__GNUC__) and defined (__GLIBC__)
1128
#if not __GLIBC_PREREQ(2, 16)
1129
#pragma GCC diagnostic pop
1130
#endif
1131
#endif
910
FD_SET(new_plugin->fd, &rfds_all);
1132
911
1133
if(maxfd < new_plugin->fd){
912
if (maxfd < new_plugin->fd){
1134
913
maxfd = new_plugin->fd;
1135
914
}
915
1136
916
}
1137
917
1138
free(direntries);
1139
direntries = NULL;
1140
close(dir_fd);
1141
dir_fd = -1;
1142
free_plugin(getplugin(NULL));
1143
918
closedir(dir);
919
dir = NULL;
920
1144
921
for(plugin *p = plugin_list; p != NULL; p = p->next){
1145
922
if(p->pid != 0){
1146
923
break;
1151
928
free_plugin_list();
1152
929
}
1153
930
}
1154
931
1155
932
/* Main loop while running plugins exist */
1156
933
while(plugin_list){
1157
934
fd_set rfds = rfds_all;
1158
935
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1159
if(select_ret == -1 and errno != EINTR){
1160
error(0, errno, "select");
1161
exitstatus = EX_OSERR;
936
if (select_ret == -1){
937
perror("select");
938
exitstatus = EXIT_FAILURE;
1162
939
goto fallback;
1163
940
}
1164
941
/* OK, now either a process completed, or something can be read
1165
942
from one of them */
1166
for(plugin *proc = plugin_list; proc != NULL;){
943
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1167
944
/* Is this process completely done? */
1168
if(proc->completed and proc->eof){
945
if(proc->eof and proc->completed){
1169
946
/* Only accept the plugin output if it exited cleanly */
1170
947
if(not WIFEXITED(proc->status)
1171
948
or WEXITSTATUS(proc->status) != 0){
1172
949
/* Bad exit by plugin */
1173
950
1174
951
if(debug){
1175
952
if(WIFEXITED(proc->status)){
1176
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1177
" status %d\n", proc->name,
1178
(intmax_t) (proc->pid),
953
fprintf(stderr, "Plugin %u exited with status %d\n",
954
(unsigned int) (proc->pid),
1179
955
WEXITSTATUS(proc->status));
1180
} else if(WIFSIGNALED(proc->status)){
1181
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1182
" signal %d: %s\n", proc->name,
1183
(intmax_t) (proc->pid),
1184
WTERMSIG(proc->status),
1185
strsignal(WTERMSIG(proc->status)));
956
} else if(WIFSIGNALED(proc->status)) {
957
fprintf(stderr, "Plugin %u killed by signal %d\n",
958
(unsigned int) (proc->pid),
959
WTERMSIG(proc->status));
1186
960
} else if(WCOREDUMP(proc->status)){
1187
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1188
" core\n", proc->name, (intmax_t) (proc->pid));
961
fprintf(stderr, "Plugin %d dumped core\n",
962
(unsigned int) (proc->pid));
1189
963
}
1190
964
}
1191
965
1192
966
/* Remove the plugin */
1193
#if defined (__GNUC__) and defined (__GLIBC__)
1194
#if not __GLIBC_PREREQ(2, 16)
1195
#pragma GCC diagnostic push
1196
#pragma GCC diagnostic ignored "-Wsign-conversion"
1197
#endif
1198
#endif
1199
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1200
-Wconversion in GNU libc
1201
before 2.16 */
1202
#if defined (__GNUC__) and defined (__GLIBC__)
1203
#if not __GLIBC_PREREQ(2, 16)
1204
#pragma GCC diagnostic pop
1205
#endif
1206
#endif
1207
967
FD_CLR(proc->fd, &rfds_all);
968
1208
969
/* Block signal while modifying process_list */
1209
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1210
(SIG_BLOCK,
1211
&sigchld_action.sa_mask,
1212
NULL));
970
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1213
971
if(ret < 0){
1214
error(0, errno, "sigprocmask");
1215
exitstatus = EX_OSERR;
972
perror("sigprocmask");
973
exitstatus = EXIT_FAILURE;
1216
974
goto fallback;
1217
975
}
1218
1219
plugin *next_plugin = proc->next;
1220
976
free_plugin(proc);
1221
proc = next_plugin;
1222
1223
977
/* We are done modifying process list, so unblock signal */
1224
ret = (int)(TEMP_FAILURE_RETRY
1225
(sigprocmask(SIG_UNBLOCK,
1226
&sigchld_action.sa_mask, NULL)));
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
NULL);
1227
980
if(ret < 0){
1228
error(0, errno, "sigprocmask");
1229
exitstatus = EX_OSERR;
981
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
1230
983
goto fallback;
1231
984
}
1232
985
1233
986
if(plugin_list == NULL){
1234
987
break;
1235
988
}
1236
1237
989
continue;
1238
990
}
1239
991
1240
992
/* This process exited nicely, so print its buffer */
1241
993
1242
994
bool bret = print_out_password(proc->buffer,
1243
995
proc->buffer_length);
1244
996
if(not bret){
1245
error(0, errno, "print_out_password");
1246
exitstatus = EX_IOERR;
997
perror("print_out_password");
998
exitstatus = EXIT_FAILURE;
1247
999
}
1248
1000
goto fallback;
1249
1001
}
1250
1002
1251
1003
/* This process has not completed. Does it have any output? */
1252
#if defined (__GNUC__) and defined (__GLIBC__)
1253
#if not __GLIBC_PREREQ(2, 16)
1254
#pragma GCC diagnostic push
1255
#pragma GCC diagnostic ignored "-Wsign-conversion"
1256
#endif
1257
#endif
1258
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1259
warning from
1260
-Wconversion
1261
in GNU libc
1262
before
1263
2.16 */
1264
#if defined (__GNUC__) and defined (__GLIBC__)
1265
#if not __GLIBC_PREREQ(2, 16)
1266
#pragma GCC diagnostic pop
1267
#endif
1268
#endif
1004
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1269
1005
/* This process had nothing to say at this time */
1270
proc = proc->next;
1271
1006
continue;
1272
1007
}
1273
1008
/* Before reading, make the process' data buffer large enough */
1274
1009
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1275
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1276
+ (size_t) BUFFER_SIZE);
1277
if(new_buffer == NULL){
1278
error(0, errno, "malloc");
1279
exitstatus = EX_OSERR;
1010
proc->buffer = realloc(proc->buffer, proc->buffer_size
1011
+ (size_t) BUFFER_SIZE);
1012
if (proc->buffer == NULL){
1013
perror("malloc");
1014
exitstatus = EXIT_FAILURE;
1280
1015
goto fallback;
1281
1016
}
1282
proc->buffer = new_buffer;
1283
1017
proc->buffer_size += BUFFER_SIZE;
1284
1018
}
1285
1019
/* Read from the process */
1286
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1287
proc->buffer
1288
+ proc->buffer_length,
1289
BUFFER_SIZE));
1290
if(sret < 0){
1020
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1021
BUFFER_SIZE);
1022
if(ret < 0){
1291
1023
/* Read error from this process; ignore the error */
1292
proc = proc->next;
1293
1024
continue;
1294
1025
}
1295
if(sret == 0){
1026
if(ret == 0){
1296
1027
/* got EOF */
1297
1028
proc->eof = true;
1298
1029
} else {
1299
proc->buffer_length += (size_t) sret;
1030
proc->buffer_length += (size_t) ret;
1300
1031
}
1301
1032
}
1302
1033
}
1303
1304
1034
1035
1305
1036
fallback:
1306
1037
1307
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1308
and exitstatus != EX_OK)){
1038
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1309
1039
/* Fallback if all plugins failed, none are found or an error
1310
1040
occured */
1311
1041
bool bret;
1312
1042
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1313
1043
char *passwordbuffer = getpass("Password: ");
1314
size_t len = strlen(passwordbuffer);
1315
/* Strip trailing newline */
1316
if(len > 0 and passwordbuffer[len-1] == '\n'){
1317
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1318
len--;
1319
}
1320
bret = print_out_password(passwordbuffer, len);
1044
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1321
1045
if(not bret){
1322
error(0, errno, "print_out_password");
1323
exitstatus = EX_IOERR;
1046
perror("print_out_password");
1047
exitstatus = EXIT_FAILURE;
1324
1048
}
1325
1049
}
1326
1050
1327
1051
/* Restore old signal handler */
1328
1052
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1329
1053
if(ret == -1){
1330
error(0, errno, "sigaction");
1331
exitstatus = EX_OSERR;
1054
perror("sigaction");
1055
exitstatus = EXIT_FAILURE;
1332
1056
}
1333
1057
1334
1058
if(custom_argv != NULL){
1335
1059
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1336
1060
free(*arg);
1338
1062
free(custom_argv);
1339
1063
}
1340
1064
1341
free(direntries);
1342
1343
if(dir_fd != -1){
1344
close(dir_fd);
1065
if(dir != NULL){
1066
closedir(dir);
1345
1067
}
1346
1068
1347
/* Kill the processes */
1069
/* Free the process list and kill the processes */
1348
1070
for(plugin *p = plugin_list; p != NULL; p = p->next){
1349
1071
if(p->pid != 0){
1350
1072
close(p->fd);
1351
1073
ret = kill(p->pid, SIGTERM);
1352
1074
if(ret == -1 and errno != ESRCH){
1353
1075
/* Set-uid proccesses might not get closed */
1354
error(0, errno, "kill");
1076
perror("kill");
1355
1077
}
1356
1078
}
1357
1079
}
1358
1080
1359
1081
/* Wait for any remaining child processes to terminate */
1360
do {
1082
do{
1361
1083
ret = wait(NULL);
1362
1084
} while(ret >= 0);
1363
1085
if(errno != ECHILD){
1364
error(0, errno, "wait");
1086
perror("wait");
1365
1087
}
1366
1088
1367
1089
free_plugin_list();
1368
1090
1369
1091
free(plugindir);
1370
free(pluginhelperdir);
1371
1092
free(argfile);
1372
1093
1373
1094
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0