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- Committer: Teddy Hogeborn
- Date: 2008-09-05 18:37:28 UTC
- Revision ID: teddy@fukt.bsnet.se-20080905183728-l0m8v3vqa302uwrw
* mandos (main): Use EAFP with pidfile.
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- 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 © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 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
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
105
98
106
99
/* Gets an 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
121
138
*new_plugin = (plugin){ .name = copy_name,
139
.argc = 1,
140
.disabled = false,
141
.next = plugin_list };
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
142
126
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;
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
135
156
do {
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
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;
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
182
static bool add_environment(plugin *p, const char *def, bool replace){
217
183
if(p == NULL){
218
184
return false;
220
186
/* namelen = length of name of environment variable */
221
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
222
188
/* Search for this environment variable */
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
225
191
/* It already exists */
226
192
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){
193
char *new = realloc(*e, strlen(def) + 1);
194
if(new == NULL){
232
195
return false;
233
196
}
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
197
*e = new;
198
strcpy(*e, def);
236
199
}
237
200
return true;
238
201
}
240
203
return add_to_char_array(def, &(p->environ), &(p->envc));
241
204
}
242
205
243
#ifndef O_CLOEXEC
244
206
/*
245
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
246
208
* Descriptor Flags".
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
210
*/
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));
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
252
214
/* If reading the flags failed, return error indication now. */
253
215
if(ret < 0){
254
216
return ret;
255
217
}
256
218
/* Store modified flag word in the descriptor. */
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
258
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
259
220
}
260
#endif /* not O_CLOEXEC */
261
221
262
222
263
223
/* Mark processes as completed when they exit, and save their exit
264
224
status. */
265
static void handle_sigchld(__attribute__((unused)) int sig){
266
int old_errno = errno;
225
void handle_sigchld(__attribute__((unused)) int sig){
267
226
while(true){
268
227
plugin *proc = plugin_list;
269
228
int status;
273
232
break;
274
233
}
275
234
if(pid == -1){
276
if(errno == ECHILD){
277
/* No child processes */
278
break;
235
if (errno != ECHILD){
236
perror("waitpid");
279
237
}
280
error(0, errno, "waitpid");
238
/* No child processes */
239
break;
281
240
}
282
241
283
242
/* A child exited, find it in process_list */
289
248
continue;
290
249
}
291
250
proc->status = status;
292
proc->completed = 1;
251
proc->completed = true;
293
252
}
294
errno = old_errno;
295
253
}
296
254
297
255
/* Prints out a password to stdout */
298
__attribute__((nonnull, warn_unused_result))
299
static bool print_out_password(const char *buffer, size_t length){
256
bool print_out_password(const char *buffer, size_t length){
300
257
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
301
261
for(size_t written = 0; written < length; written += (size_t)ret){
302
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
303
263
length - written));
309
269
}
310
270
311
271
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
313
272
static void free_plugin(plugin *plugin_node){
314
273
315
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
321
280
}
322
281
free(plugin_node->environ);
323
282
free(plugin_node->buffer);
324
283
325
284
/* Removes the plugin from the singly-linked list */
326
285
if(plugin_node == plugin_list){
327
286
/* First one - simple */
349
308
char *plugindir = NULL;
350
309
char *argfile = NULL;
351
310
FILE *conffp;
352
struct dirent **direntries = NULL;
311
size_t d_name_len;
312
DIR *dir = NULL;
313
struct dirent *dirst;
353
314
struct stat st;
354
315
fd_set rfds_all;
355
316
int ret, maxfd = 0;
356
ssize_t sret;
357
317
uid_t uid = 65534;
358
318
gid_t gid = 65534;
359
319
bool debug = false;
363
323
.sa_flags = SA_NOCLDSTOP };
364
324
char **custom_argv = NULL;
365
325
int custom_argc = 0;
366
int dir_fd = -1;
367
326
368
327
/* Establish a signal handler */
369
328
sigemptyset(&sigchld_action.sa_mask);
370
329
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
371
330
if(ret == -1){
372
error(0, errno, "sigaddset");
373
exitstatus = EX_OSERR;
331
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
374
333
goto fallback;
375
334
}
376
335
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
377
336
if(ret == -1){
378
error(0, errno, "sigaction");
379
exitstatus = EX_OSERR;
337
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
380
339
goto fallback;
381
340
}
382
341
414
373
.doc = "Group ID the plugins will run as", .group = 3 },
415
374
{ .name = "debug", .key = 132,
416
375
.doc = "Debug mode", .group = 4 },
417
/*
418
* These reproduce what we would get without ARGP_NO_HELP
419
*/
420
{ .name = "help", .key = '?',
421
.doc = "Give this help list", .group = -1 },
422
{ .name = "usage", .key = -3,
423
.doc = "Give a short usage message", .group = -1 },
424
{ .name = "version", .key = 'V',
425
.doc = "Print program version", .group = -1 },
426
376
{ .name = NULL }
427
377
};
428
378
429
__attribute__((nonnull(3)))
430
error_t parse_opt(int key, char *arg, struct argp_state *state){
431
errno = 0;
432
switch(key){
433
char *tmp;
434
intmax_t tmp_id;
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
381
switch (key) {
435
382
case 'g': /* --global-options */
436
{
437
char *plugin_option;
438
while((plugin_option = strsep(&arg, ",")) != NULL){
439
if(not add_argument(getplugin(NULL), plugin_option)){
440
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;
441
392
}
442
393
}
443
errno = 0;
444
394
}
445
395
break;
446
396
case 'G': /* --global-env */
447
if(add_environment(getplugin(NULL), arg, true)){
448
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
}
449
408
}
450
409
break;
451
410
case 'o': /* --options-for */
452
{
453
char *option_list = strchr(arg, ':');
454
if(option_list == NULL){
455
argp_error(state, "No colon in \"%s\"", arg);
456
errno = EINVAL;
457
break;
458
}
459
*option_list = '\0';
460
option_list++;
461
if(arg[0] == '\0'){
462
argp_error(state, "Empty plugin name");
463
errno = EINVAL;
464
break;
465
}
466
char *option;
467
while((option = strsep(&option_list, ",")) != NULL){
468
if(not add_argument(getplugin(arg), option)){
469
break;
470
}
471
}
472
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
}
473
430
}
474
431
break;
475
432
case 'E': /* --env-for */
433
if(arg == NULL){
434
break;
435
}
476
436
{
477
437
char *envdef = strchr(arg, ':');
478
438
if(envdef == NULL){
479
argp_error(state, "No colon in \"%s\"", arg);
480
errno = EINVAL;
481
break;
482
}
483
*envdef = '\0';
439
break;
440
}
441
char *p_name = strndup(arg, (size_t) (envdef-arg));
442
if(p_name == NULL){
443
break;
444
}
484
445
envdef++;
485
if(arg[0] == '\0'){
486
argp_error(state, "Empty plugin name");
487
errno = EINVAL;
488
break;
489
}
490
if(add_environment(getplugin(arg), envdef, true)){
491
errno = 0;
446
if(not add_environment(getplugin(p_name), envdef, true)){
447
perror("add_environment");
492
448
}
493
449
}
494
450
break;
495
451
case 'd': /* --disable */
496
{
452
if (arg != NULL){
497
453
plugin *p = getplugin(arg);
498
if(p != NULL){
499
p->disabled = true;
500
errno = 0;
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
501
456
}
457
p->disabled = true;
502
458
}
503
459
break;
504
460
case 'e': /* --enable */
505
{
461
if (arg != NULL){
506
462
plugin *p = getplugin(arg);
507
if(p != NULL){
508
p->disabled = false;
509
errno = 0;
463
if(p == NULL){
464
return ARGP_ERR_UNKNOWN;
510
465
}
466
p->disabled = false;
511
467
}
512
468
break;
513
469
case 128: /* --plugin-dir */
514
free(plugindir);
515
470
plugindir = strdup(arg);
516
if(plugindir != NULL){
517
errno = 0;
518
}
471
if(plugindir == NULL){
472
perror("strdup");
473
}
519
474
break;
520
475
case 129: /* --config-file */
521
476
/* This is already done by parse_opt_config_file() */
522
477
break;
523
478
case 130: /* --userid */
524
tmp_id = strtoimax(arg, &tmp, 10);
525
if(errno != 0 or tmp == arg or *tmp != '\0'
526
or tmp_id != (uid_t)tmp_id){
527
argp_error(state, "Bad user ID number: \"%s\", using %"
528
PRIdMAX, arg, (intmax_t)uid);
529
break;
530
}
531
uid = (uid_t)tmp_id;
532
errno = 0;
479
uid = (uid_t)strtol(arg, NULL, 10);
533
480
break;
534
481
case 131: /* --groupid */
535
tmp_id = strtoimax(arg, &tmp, 10);
536
if(errno != 0 or tmp == arg or *tmp != '\0'
537
or tmp_id != (gid_t)tmp_id){
538
argp_error(state, "Bad group ID number: \"%s\", using %"
539
PRIdMAX, arg, (intmax_t)gid);
540
break;
541
}
542
gid = (gid_t)tmp_id;
543
errno = 0;
482
gid = (gid_t)strtol(arg, NULL, 10);
544
483
break;
545
484
case 132: /* --debug */
546
485
debug = true;
547
486
break;
548
/*
549
* These reproduce what we would get without ARGP_NO_HELP
550
*/
551
case '?': /* --help */
552
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
553
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
554
case -3: /* --usage */
555
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
556
argp_state_help(state, state->out_stream,
557
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
558
case 'V': /* --version */
559
fprintf(state->out_stream, "%s\n", argp_program_version);
560
exit(EXIT_SUCCESS);
561
break;
562
/*
563
* When adding more options before this line, remember to also add a
564
* "case" to the "parse_opt_config_file" function below.
565
*/
566
487
case ARGP_KEY_ARG:
567
/* Cryptsetup always passes an argument, which is an empty
568
string if "none" was specified in /etc/crypttab. So if
569
argument was empty, we ignore it silently. */
570
if(arg[0] == '\0'){
571
break;
572
}
488
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
489
break;
490
case ARGP_KEY_END:
491
break;
573
492
default:
574
493
return ARGP_ERR_UNKNOWN;
575
494
}
576
return errno; /* Set to 0 at start */
495
return 0;
577
496
}
578
497
579
498
/* This option parser is the same as parse_opt() above, except it
580
499
ignores everything but the --config-file option. */
581
error_t parse_opt_config_file(int key, char *arg,
582
__attribute__((unused))
583
struct argp_state *state){
584
errno = 0;
585
switch(key){
500
error_t parse_opt_config_file (int key, char *arg,
501
__attribute__((unused))
502
struct argp_state *state) {
503
switch (key) {
586
504
case 'g': /* --global-options */
587
505
case 'G': /* --global-env */
588
506
case 'o': /* --options-for */
592
510
case 128: /* --plugin-dir */
593
511
break;
594
512
case 129: /* --config-file */
595
free(argfile);
596
513
argfile = strdup(arg);
597
if(argfile != NULL){
598
errno = 0;
514
if(argfile == NULL){
515
perror("strdup");
599
516
}
600
break;
517
break;
601
518
case 130: /* --userid */
602
519
case 131: /* --groupid */
603
520
case 132: /* --debug */
604
case '?': /* --help */
605
case -3: /* --usage */
606
case 'V': /* --version */
607
521
case ARGP_KEY_ARG:
522
case ARGP_KEY_END:
608
523
break;
609
524
default:
610
525
return ARGP_ERR_UNKNOWN;
611
526
}
612
return errno;
527
return 0;
613
528
}
614
529
615
530
struct argp argp = { .options = options,
617
532
.args_doc = "",
618
533
.doc = "Mandos plugin runner -- Run plugins" };
619
534
620
/* 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
621
536
config file location, if any. */
622
ret = argp_parse(&argp, argc, argv,
623
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
624
NULL, NULL);
625
switch(ret){
626
case 0:
627
break;
628
case ENOMEM:
629
default:
630
errno = ret;
631
error(0, errno, "argp_parse");
632
exitstatus = EX_OSERR;
633
goto fallback;
634
case EINVAL:
635
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;
636
541
goto fallback;
637
542
}
638
543
640
545
argp.parser = parse_opt;
641
546
642
547
/* Open the configfile if available */
643
if(argfile == NULL){
548
if (argfile == NULL){
644
549
conffp = fopen(AFILE, "r");
645
550
} else {
646
551
conffp = fopen(argfile, "r");
647
}
552
}
648
553
if(conffp != NULL){
649
554
char *org_line = NULL;
650
555
char *p, *arg, *new_arg, *line;
651
556
size_t size = 0;
557
ssize_t sret;
652
558
const char whitespace_delims[] = " \r\t\f\v\n";
653
559
const char comment_delim[] = "#";
654
560
655
561
custom_argc = 1;
656
562
custom_argv = malloc(sizeof(char*) * 2);
657
563
if(custom_argv == NULL){
658
error(0, errno, "malloc");
659
exitstatus = EX_OSERR;
564
perror("malloc");
565
exitstatus = EXIT_FAILURE;
660
566
goto fallback;
661
567
}
662
568
custom_argv[0] = argv[0];
663
569
custom_argv[1] = NULL;
664
570
665
571
/* for each line in the config file, strip whitespace and ignore
666
572
commented text */
667
573
while(true){
669
575
if(sret == -1){
670
576
break;
671
577
}
672
578
673
579
line = org_line;
674
580
arg = strsep(&line, comment_delim);
675
581
while((p = strsep(&arg, whitespace_delims)) != NULL){
678
584
}
679
585
new_arg = strdup(p);
680
586
if(new_arg == NULL){
681
error(0, errno, "strdup");
682
exitstatus = EX_OSERR;
587
perror("strdup");
588
exitstatus = EXIT_FAILURE;
683
589
free(org_line);
684
590
goto fallback;
685
591
}
686
592
687
593
custom_argc += 1;
688
{
689
char **new_argv = realloc(custom_argv, sizeof(char *)
690
* ((unsigned int)
691
custom_argc + 1));
692
if(new_argv == NULL){
693
error(0, errno, "realloc");
694
exitstatus = EX_OSERR;
695
free(new_arg);
696
free(org_line);
697
goto fallback;
698
} else {
699
custom_argv = new_argv;
700
}
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;
701
601
}
702
602
custom_argv[custom_argc-1] = new_arg;
703
custom_argv[custom_argc] = NULL;
603
custom_argv[custom_argc] = NULL;
704
604
}
705
605
}
706
do {
707
ret = fclose(conffp);
708
} while(ret == EOF and errno == EINTR);
709
if(ret == EOF){
710
error(0, errno, "fclose");
711
exitstatus = EX_IOERR;
712
goto fallback;
713
}
714
606
free(org_line);
715
607
} else {
716
608
/* Check for harmful errors and go to fallback. Other errors might
717
609
not affect opening plugins */
718
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
719
error(0, errno, "fopen");
720
exitstatus = EX_OSERR;
610
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
611
perror("fopen");
612
exitstatus = EXIT_FAILURE;
721
613
goto fallback;
722
614
}
723
615
}
724
/* If there were any arguments from the configuration file, pass
725
them to parser as command line arguments */
616
/* If there was any arguments from configuration file,
617
pass them to parser as command arguments */
726
618
if(custom_argv != NULL){
727
ret = argp_parse(&argp, custom_argc, custom_argv,
728
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
729
NULL, NULL);
730
switch(ret){
731
case 0:
732
break;
733
case ENOMEM:
734
default:
735
errno = ret;
736
error(0, errno, "argp_parse");
737
exitstatus = EX_OSERR;
738
goto fallback;
739
case EINVAL:
740
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;
741
624
goto fallback;
742
625
}
743
626
}
744
627
745
628
/* Parse actual command line arguments, to let them override the
746
629
config file */
747
ret = argp_parse(&argp, argc, argv,
748
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
749
NULL, NULL);
750
switch(ret){
751
case 0:
752
break;
753
case ENOMEM:
754
default:
755
errno = ret;
756
error(0, errno, "argp_parse");
757
exitstatus = EX_OSERR;
758
goto fallback;
759
case EINVAL:
760
exitstatus = EX_USAGE;
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;
761
634
goto fallback;
762
635
}
763
636
768
641
for(char **a = p->argv; *a != NULL; a++){
769
642
fprintf(stderr, "\tArg: %s\n", *a);
770
643
}
771
fprintf(stderr, "...and %d environment variables\n", p->envc);
644
fprintf(stderr, "...and %u environment variables\n", p->envc);
772
645
for(char **a = p->environ; *a != NULL; a++){
773
646
fprintf(stderr, "\t%s\n", *a);
774
647
}
775
648
}
776
649
}
777
650
778
if(getuid() == 0){
779
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
if(plugindir_fd == -1){
783
if(errno != ENOENT){
784
error(0, errno, "open(\"" PDIR "\")");
785
}
786
} else {
787
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
788
if(ret == -1){
789
error(0, errno, "fstat");
790
} else {
791
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
792
ret = fchown(plugindir_fd, uid, gid);
793
if(ret == -1){
794
error(0, errno, "fchown");
795
}
796
}
797
}
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
799
}
800
}
801
802
/* Lower permissions */
803
ret = setgid(gid);
804
if(ret == -1){
805
error(0, errno, "setgid");
806
}
651
/* Strip permissions down to nobody */
807
652
ret = setuid(uid);
808
if(ret == -1){
809
error(0, errno, "setuid");
810
}
811
812
/* 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 */
813
674
{
814
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
815
#ifdef O_CLOEXEC
816
O_CLOEXEC
817
#else /* not O_CLOEXEC */
818
0
819
#endif /* not O_CLOEXEC */
820
);
821
if(dir_fd == -1){
822
error(0, errno, "Could not open plugin dir");
823
exitstatus = EX_UNAVAILABLE;
824
goto fallback;
825
}
826
827
#ifndef O_CLOEXEC
828
/* Set the FD_CLOEXEC flag on the directory */
829
ret = set_cloexec_flag(dir_fd);
830
if(ret < 0){
831
error(0, errno, "set_cloexec_flag");
832
exitstatus = EX_OSERR;
833
goto fallback;
834
}
835
#endif /* O_CLOEXEC */
836
}
837
838
int good_name(const struct dirent * const dirent){
839
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
840
"*.dpkg-old", "*.dpkg-bak",
841
"*.dpkg-divert", NULL };
842
#ifdef __GNUC__
843
#pragma GCC diagnostic push
844
#pragma GCC diagnostic ignored "-Wcast-qual"
845
#endif
846
for(const char **pat = (const char **)patterns;
847
*pat != NULL; pat++){
848
#ifdef __GNUC__
849
#pragma GCC diagnostic pop
850
#endif
851
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
852
!= FNM_NOMATCH){
853
if(debug){
854
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
855
" matching pattern %s\n", dirent->d_name, *pat);
856
}
857
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;
858
682
}
859
683
}
860
return 1;
861
}
862
863
#ifdef __GLIBC__
864
#if __GLIBC_PREREQ(2, 15)
865
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
866
alphasort);
867
#else /* not __GLIBC_PREREQ(2, 15) */
868
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
869
&direntries, good_name, alphasort);
870
#endif /* not __GLIBC_PREREQ(2, 15) */
871
#else /* not __GLIBC__ */
872
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
873
&direntries, good_name, alphasort);
874
#endif /* not __GLIBC__ */
875
if(numplugins == -1){
876
error(0, errno, "Could not scan plugin dir");
877
direntries = NULL;
878
exitstatus = EX_OSERR;
879
goto fallback;
880
684
}
881
685
882
686
FD_ZERO(&rfds_all);
883
687
884
688
/* Read and execute any executable in the plugin directory*/
885
for(int i = 0; i < numplugins; i++){
886
887
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
888
if(plugin_fd == -1){
889
error(0, errno, "Could not open plugin");
890
continue;
891
}
892
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
893
if(ret == -1){
894
error(0, errno, "stat");
895
TEMP_FAILURE_RETRY(close(plugin_fd));
896
continue;
897
}
898
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
899
761
/* Ignore non-executable files */
900
if(not S_ISREG(st.st_mode)
901
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
902
X_OK, 0)) != 0)){
762
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
903
763
if(debug){
904
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
905
" with bad type or mode\n",
906
plugindir != NULL ? plugindir : PDIR,
907
direntries[i]->d_name);
764
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
765
" with bad type or mode\n", filename);
908
766
}
909
TEMP_FAILURE_RETRY(close(plugin_fd));
767
free(filename);
910
768
continue;
911
769
}
912
770
913
plugin *p = getplugin(direntries[i]->d_name);
771
plugin *p = getplugin(dirst->d_name);
914
772
if(p == NULL){
915
error(0, errno, "getplugin");
916
TEMP_FAILURE_RETRY(close(plugin_fd));
773
perror("getplugin");
774
free(filename);
917
775
continue;
918
776
}
919
777
if(p->disabled){
920
778
if(debug){
921
779
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
922
direntries[i]->d_name);
780
dirst->d_name);
923
781
}
924
TEMP_FAILURE_RETRY(close(plugin_fd));
782
free(filename);
925
783
continue;
926
784
}
927
785
{
930
788
if(g != NULL){
931
789
for(char **a = g->argv + 1; *a != NULL; a++){
932
790
if(not add_argument(p, *a)){
933
error(0, errno, "add_argument");
791
perror("add_argument");
934
792
}
935
793
}
936
794
/* Add global environment variables */
937
795
for(char **e = g->environ; *e != NULL; e++){
938
796
if(not add_environment(p, *e, false)){
939
error(0, errno, "add_environment");
797
perror("add_environment");
940
798
}
941
799
}
942
800
}
943
801
}
944
/* If this plugin has any environment variables, we need to
945
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. */
946
805
if(p->environ[0] != NULL){
947
806
for(char **e = environ; *e != NULL; e++){
948
807
if(not add_environment(p, *e, false)){
949
error(0, errno, "add_environment");
808
perror("add_environment");
950
809
}
951
810
}
952
811
}
953
812
954
813
int pipefd[2];
955
#ifndef O_CLOEXEC
956
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
957
#else /* O_CLOEXEC */
958
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
959
#endif /* O_CLOEXEC */
960
if(ret == -1){
961
error(0, errno, "pipe");
962
exitstatus = EX_OSERR;
963
goto fallback;
964
}
965
if(pipefd[0] >= FD_SETSIZE){
966
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
967
FD_SETSIZE);
968
TEMP_FAILURE_RETRY(close(pipefd[0]));
969
TEMP_FAILURE_RETRY(close(pipefd[1]));
970
exitstatus = EX_OSERR;
971
goto fallback;
972
}
973
#ifndef O_CLOEXEC
814
ret = pipe(pipefd);
815
if (ret == -1){
816
perror("pipe");
817
exitstatus = EXIT_FAILURE;
818
goto fallback;
819
}
974
820
/* Ask OS to automatic close the pipe on exec */
975
821
ret = set_cloexec_flag(pipefd[0]);
976
822
if(ret < 0){
977
error(0, errno, "set_cloexec_flag");
978
TEMP_FAILURE_RETRY(close(pipefd[0]));
979
TEMP_FAILURE_RETRY(close(pipefd[1]));
980
exitstatus = EX_OSERR;
823
perror("set_cloexec_flag");
824
exitstatus = EXIT_FAILURE;
981
825
goto fallback;
982
826
}
983
827
ret = set_cloexec_flag(pipefd[1]);
984
828
if(ret < 0){
985
error(0, errno, "set_cloexec_flag");
986
TEMP_FAILURE_RETRY(close(pipefd[0]));
987
TEMP_FAILURE_RETRY(close(pipefd[1]));
988
exitstatus = EX_OSERR;
829
perror("set_cloexec_flag");
830
exitstatus = EXIT_FAILURE;
989
831
goto fallback;
990
832
}
991
#endif /* not O_CLOEXEC */
992
833
/* Block SIGCHLD until process is safely in process list */
993
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
994
&sigchld_action.sa_mask,
995
NULL));
834
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
996
835
if(ret < 0){
997
error(0, errno, "sigprocmask");
998
exitstatus = EX_OSERR;
836
perror("sigprocmask");
837
exitstatus = EXIT_FAILURE;
999
838
goto fallback;
1000
839
}
1001
840
/* Starting a new process to be watched */
1002
pid_t pid;
1003
do {
1004
pid = fork();
1005
} while(pid == -1 and errno == EINTR);
841
pid_t pid = fork();
1006
842
if(pid == -1){
1007
error(0, errno, "fork");
1008
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1009
&sigchld_action.sa_mask, NULL));
1010
TEMP_FAILURE_RETRY(close(pipefd[0]));
1011
TEMP_FAILURE_RETRY(close(pipefd[1]));
1012
exitstatus = EX_OSERR;
843
perror("fork");
844
exitstatus = EXIT_FAILURE;
1013
845
goto fallback;
1014
846
}
1015
847
if(pid == 0){
1016
848
/* this is the child process */
1017
849
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1018
850
if(ret < 0){
1019
error(0, errno, "sigaction");
1020
_exit(EX_OSERR);
851
perror("sigaction");
852
_exit(EXIT_FAILURE);
1021
853
}
1022
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
854
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1023
855
if(ret < 0){
1024
error(0, errno, "sigprocmask");
1025
_exit(EX_OSERR);
856
perror("sigprocmask");
857
_exit(EXIT_FAILURE);
1026
858
}
1027
859
1028
860
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1029
861
if(ret == -1){
1030
error(0, errno, "dup2");
1031
_exit(EX_OSERR);
862
perror("dup2");
863
_exit(EXIT_FAILURE);
1032
864
}
1033
865
1034
if(fexecve(plugin_fd, p->argv,
1035
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1036
error(0, errno, "fexecve for %s/%s",
1037
plugindir != NULL ? plugindir : PDIR,
1038
direntries[i]->d_name);
1039
_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
}
1040
881
}
1041
882
/* no return */
1042
883
}
1043
884
/* Parent process */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
1046
TEMP_FAILURE_RETRY(close(plugin_fd));
1047
plugin *new_plugin = getplugin(direntries[i]->d_name);
1048
if(new_plugin == NULL){
1049
error(0, errno, "getplugin");
1050
ret = (int)(TEMP_FAILURE_RETRY
1051
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1052
NULL)));
885
close(pipefd[1]); /* Close unused write end of pipe */
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);
1053
891
if(ret < 0){
1054
error(0, errno, "sigprocmask");
892
perror("sigprocmask");
1055
893
}
1056
exitstatus = EX_OSERR;
894
exitstatus = EXIT_FAILURE;
1057
895
goto fallback;
1058
896
}
1059
897
1062
900
1063
901
/* Unblock SIGCHLD so signal handler can be run if this process
1064
902
has already completed */
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1066
&sigchld_action.sa_mask,
1067
NULL));
903
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1068
904
if(ret < 0){
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
905
perror("sigprocmask");
906
exitstatus = EXIT_FAILURE;
1071
907
goto fallback;
1072
908
}
1073
909
1074
#if defined (__GNUC__) and defined (__GLIBC__)
1075
#if not __GLIBC_PREREQ(2, 16)
1076
#pragma GCC diagnostic push
1077
#pragma GCC diagnostic ignored "-Wsign-conversion"
1078
#endif
1079
#endif
1080
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1081
-Wconversion in GNU libc
1082
before 2.16 */
1083
#if defined (__GNUC__) and defined (__GLIBC__)
1084
#if not __GLIBC_PREREQ(2, 16)
1085
#pragma GCC diagnostic pop
1086
#endif
1087
#endif
910
FD_SET(new_plugin->fd, &rfds_all);
1088
911
1089
if(maxfd < new_plugin->fd){
912
if (maxfd < new_plugin->fd){
1090
913
maxfd = new_plugin->fd;
1091
914
}
915
1092
916
}
1093
917
1094
free(direntries);
1095
direntries = NULL;
1096
TEMP_FAILURE_RETRY(close(dir_fd));
1097
dir_fd = -1;
1098
free_plugin(getplugin(NULL));
1099
918
closedir(dir);
919
dir = NULL;
920
1100
921
for(plugin *p = plugin_list; p != NULL; p = p->next){
1101
922
if(p->pid != 0){
1102
923
break;
1107
928
free_plugin_list();
1108
929
}
1109
930
}
1110
931
1111
932
/* Main loop while running plugins exist */
1112
933
while(plugin_list){
1113
934
fd_set rfds = rfds_all;
1114
935
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1115
if(select_ret == -1 and errno != EINTR){
1116
error(0, errno, "select");
1117
exitstatus = EX_OSERR;
936
if (select_ret == -1){
937
perror("select");
938
exitstatus = EXIT_FAILURE;
1118
939
goto fallback;
1119
940
}
1120
941
/* OK, now either a process completed, or something can be read
1121
942
from one of them */
1122
for(plugin *proc = plugin_list; proc != NULL;){
943
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1123
944
/* Is this process completely done? */
1124
if(proc->completed and proc->eof){
945
if(proc->eof and proc->completed){
1125
946
/* Only accept the plugin output if it exited cleanly */
1126
947
if(not WIFEXITED(proc->status)
1127
948
or WEXITSTATUS(proc->status) != 0){
1128
949
/* Bad exit by plugin */
1129
950
1130
951
if(debug){
1131
952
if(WIFEXITED(proc->status)){
1132
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1133
" status %d\n", proc->name,
1134
(intmax_t) (proc->pid),
953
fprintf(stderr, "Plugin %u exited with status %d\n",
954
(unsigned int) (proc->pid),
1135
955
WEXITSTATUS(proc->status));
1136
} else if(WIFSIGNALED(proc->status)){
1137
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1138
" signal %d: %s\n", proc->name,
1139
(intmax_t) (proc->pid),
1140
WTERMSIG(proc->status),
1141
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));
1142
960
} else if(WCOREDUMP(proc->status)){
1143
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1144
" core\n", proc->name, (intmax_t) (proc->pid));
961
fprintf(stderr, "Plugin %d dumped core\n",
962
(unsigned int) (proc->pid));
1145
963
}
1146
964
}
1147
965
1148
966
/* Remove the plugin */
1149
#if defined (__GNUC__) and defined (__GLIBC__)
1150
#if not __GLIBC_PREREQ(2, 16)
1151
#pragma GCC diagnostic push
1152
#pragma GCC diagnostic ignored "-Wsign-conversion"
1153
#endif
1154
#endif
1155
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1156
-Wconversion in GNU libc
1157
before 2.16 */
1158
#if defined (__GNUC__) and defined (__GLIBC__)
1159
#if not __GLIBC_PREREQ(2, 16)
1160
#pragma GCC diagnostic pop
1161
#endif
1162
#endif
1163
967
FD_CLR(proc->fd, &rfds_all);
968
1164
969
/* Block signal while modifying process_list */
1165
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1166
(SIG_BLOCK,
1167
&sigchld_action.sa_mask,
1168
NULL));
970
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1169
971
if(ret < 0){
1170
error(0, errno, "sigprocmask");
1171
exitstatus = EX_OSERR;
972
perror("sigprocmask");
973
exitstatus = EXIT_FAILURE;
1172
974
goto fallback;
1173
975
}
1174
1175
plugin *next_plugin = proc->next;
1176
976
free_plugin(proc);
1177
proc = next_plugin;
1178
1179
977
/* We are done modifying process list, so unblock signal */
1180
ret = (int)(TEMP_FAILURE_RETRY
1181
(sigprocmask(SIG_UNBLOCK,
1182
&sigchld_action.sa_mask, NULL)));
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
NULL);
1183
980
if(ret < 0){
1184
error(0, errno, "sigprocmask");
1185
exitstatus = EX_OSERR;
981
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
1186
983
goto fallback;
1187
984
}
1188
985
1189
986
if(plugin_list == NULL){
1190
987
break;
1191
988
}
1192
1193
989
continue;
1194
990
}
1195
991
1196
992
/* This process exited nicely, so print its buffer */
1197
993
1198
994
bool bret = print_out_password(proc->buffer,
1199
995
proc->buffer_length);
1200
996
if(not bret){
1201
error(0, errno, "print_out_password");
1202
exitstatus = EX_IOERR;
997
perror("print_out_password");
998
exitstatus = EXIT_FAILURE;
1203
999
}
1204
1000
goto fallback;
1205
1001
}
1206
1002
1207
1003
/* This process has not completed. Does it have any output? */
1208
#if defined (__GNUC__) and defined (__GLIBC__)
1209
#if not __GLIBC_PREREQ(2, 16)
1210
#pragma GCC diagnostic push
1211
#pragma GCC diagnostic ignored "-Wsign-conversion"
1212
#endif
1213
#endif
1214
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1215
warning from
1216
-Wconversion
1217
in GNU libc
1218
before
1219
2.16 */
1220
#if defined (__GNUC__) and defined (__GLIBC__)
1221
#if not __GLIBC_PREREQ(2, 16)
1222
#pragma GCC diagnostic pop
1223
#endif
1224
#endif
1004
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1225
1005
/* This process had nothing to say at this time */
1226
proc = proc->next;
1227
1006
continue;
1228
1007
}
1229
1008
/* Before reading, make the process' data buffer large enough */
1230
1009
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1231
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1232
+ (size_t) BUFFER_SIZE);
1233
if(new_buffer == NULL){
1234
error(0, errno, "malloc");
1235
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;
1236
1015
goto fallback;
1237
1016
}
1238
proc->buffer = new_buffer;
1239
1017
proc->buffer_size += BUFFER_SIZE;
1240
1018
}
1241
1019
/* Read from the process */
1242
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1243
proc->buffer
1244
+ proc->buffer_length,
1245
BUFFER_SIZE));
1246
if(sret < 0){
1020
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1021
BUFFER_SIZE);
1022
if(ret < 0){
1247
1023
/* Read error from this process; ignore the error */
1248
proc = proc->next;
1249
1024
continue;
1250
1025
}
1251
if(sret == 0){
1026
if(ret == 0){
1252
1027
/* got EOF */
1253
1028
proc->eof = true;
1254
1029
} else {
1255
proc->buffer_length += (size_t) sret;
1030
proc->buffer_length += (size_t) ret;
1256
1031
}
1257
1032
}
1258
1033
}
1259
1260
1034
1035
1261
1036
fallback:
1262
1037
1263
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1264
and exitstatus != EX_OK)){
1038
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1265
1039
/* Fallback if all plugins failed, none are found or an error
1266
1040
occured */
1267
1041
bool bret;
1268
1042
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1269
1043
char *passwordbuffer = getpass("Password: ");
1270
size_t len = strlen(passwordbuffer);
1271
/* Strip trailing newline */
1272
if(len > 0 and passwordbuffer[len-1] == '\n'){
1273
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1274
len--;
1275
}
1276
bret = print_out_password(passwordbuffer, len);
1044
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1277
1045
if(not bret){
1278
error(0, errno, "print_out_password");
1279
exitstatus = EX_IOERR;
1046
perror("print_out_password");
1047
exitstatus = EXIT_FAILURE;
1280
1048
}
1281
1049
}
1282
1050
1283
1051
/* Restore old signal handler */
1284
1052
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1285
1053
if(ret == -1){
1286
error(0, errno, "sigaction");
1287
exitstatus = EX_OSERR;
1054
perror("sigaction");
1055
exitstatus = EXIT_FAILURE;
1288
1056
}
1289
1057
1290
1058
if(custom_argv != NULL){
1291
1059
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1292
1060
free(*arg);
1294
1062
free(custom_argv);
1295
1063
}
1296
1064
1297
free(direntries);
1298
1299
if(dir_fd != -1){
1300
TEMP_FAILURE_RETRY(close(dir_fd));
1065
if(dir != NULL){
1066
closedir(dir);
1301
1067
}
1302
1068
1303
/* Kill the processes */
1069
/* Free the process list and kill the processes */
1304
1070
for(plugin *p = plugin_list; p != NULL; p = p->next){
1305
1071
if(p->pid != 0){
1306
1072
close(p->fd);
1307
1073
ret = kill(p->pid, SIGTERM);
1308
1074
if(ret == -1 and errno != ESRCH){
1309
1075
/* Set-uid proccesses might not get closed */
1310
error(0, errno, "kill");
1076
perror("kill");
1311
1077
}
1312
1078
}
1313
1079
}
1314
1080
1315
1081
/* Wait for any remaining child processes to terminate */
1316
do {
1082
do{
1317
1083
ret = wait(NULL);
1318
1084
} while(ret >= 0);
1319
1085
if(errno != ECHILD){
1320
error(0, errno, "wait");
1086
perror("wait");
1321
1087
}
1322
1088
1323
1089
free_plugin_list();
1324
1090
1325
1091
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0