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- Committer: Teddy Hogeborn
- Date: 2014-06-14 02:55:24 UTC
- Revision ID: teddy@recompile.se-20140614025524-k03150tjp4t89w1d
plugin-runner: Restore resources correctly if fork() fails.
* plugin-runner.c (main): If fork() fails, close pipe FD's and restore
signal mask for SIGCHLD.
* plugin-runner.c (main): If fork() fails, close pipe FD's and restore
signal mask for SIGCHLD.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
18
19
* along with this program. If not, see
19
20
* <http://www.gnu.org/licenses/>.
20
21
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
22
23
*/
23
24
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
O_CLOEXEC */
26
27
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* DIR, fdopendir(), fstat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
35
36
uid_t, gid_t, getuid(), getgid(),
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
46
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() */
47
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
48
FD_CLOEXEC, write(), STDOUT_FILENO,
49
struct stat, fstat(), close(),
50
setgid(), setuid(), S_ISREG(),
51
faccessat() pipe(), fork(),
52
_exit(), dup2(), fexecve(), read()
53
*/
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
55
FD_CLOEXEC, openat() */
56
#include <string.h> /* strsep, strlen(), strsignal(),
57
strcmp(), strncmp() */
55
58
#include <errno.h> /* errno */
56
59
#include <argp.h> /* struct argp_option, struct
57
60
argp_state, struct argp,
61
64
#include <signal.h> /* struct sigaction, sigemptyset(),
62
65
sigaddset(), sigaction(),
63
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
75
#include <fnmatch.h> /* fnmatch() */
66
76
67
77
#define BUFFER_SIZE 256
68
78
69
79
#define PDIR "/lib/mandos/plugins.d"
70
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
81
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct plugin;
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
84
77
85
typedef struct plugin{
78
86
char *name; /* can be NULL or any plugin name */
81
89
char **environ;
82
90
int envc;
83
91
bool disabled;
84
92
85
93
/* Variables used for running processes*/
86
94
pid_t pid;
87
95
int fd;
89
97
size_t buffer_size;
90
98
size_t buffer_length;
91
99
bool eof;
92
volatile bool completed;
93
volatile int status;
100
volatile sig_atomic_t completed;
101
int status;
94
102
struct plugin *next;
95
103
} plugin;
96
104
97
105
static plugin *plugin_list = NULL;
98
106
99
/* Gets a existing plugin based on name,
107
/* Gets an existing plugin based on name,
100
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
101
110
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
104
if ((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
111
/* Check for existing plugin with that name */
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
if((p->name == name)
114
or (p->name and name and (strcmp(p->name, name) == 0))){
106
115
return p;
107
116
}
108
117
}
109
118
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
112
124
return NULL;
113
125
}
114
126
char *copy_name = NULL;
115
127
if(name != NULL){
116
copy_name = strdup(name);
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
117
131
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
118
135
return NULL;
119
136
}
120
137
}
121
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
126
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
138
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
143
144
do {
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
147
if(new_plugin->argv == NULL){
148
int e = errno;
129
149
free(copy_name);
130
150
free(new_plugin);
151
errno = e;
131
152
return NULL;
132
153
}
133
154
new_plugin->argv[0] = copy_name;
134
155
new_plugin->argv[1] = NULL;
135
156
136
new_plugin->environ = malloc(sizeof(char *));
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
137
160
if(new_plugin->environ == NULL){
161
int e = errno;
138
162
free(copy_name);
139
163
free(new_plugin->argv);
140
164
free(new_plugin);
165
errno = e;
141
166
return NULL;
142
167
}
143
168
new_plugin->environ[0] = NULL;
148
173
}
149
174
150
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
151
177
static bool add_to_char_array(const char *new, char ***array,
152
178
int *len){
153
179
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
180
char **new_array = NULL;
181
do {
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
156
185
/* Malloc check */
157
if(*array == NULL){
186
if(new_array == NULL){
158
187
return false;
159
188
}
189
*array = new_array;
160
190
/* Make a copy of the new string */
161
char *copy = strdup(new);
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
162
195
if(copy == NULL){
163
196
return false;
164
197
}
171
204
}
172
205
173
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
174
208
static bool add_argument(plugin *p, const char *arg){
175
209
if(p == NULL){
176
210
return false;
179
213
}
180
214
181
215
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
182
217
static bool add_environment(plugin *p, const char *def, bool replace){
183
218
if(p == NULL){
184
219
return false;
186
221
/* namelen = length of name of environment variable */
187
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
223
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
191
226
/* It already exists */
192
227
if(replace){
193
char *new = realloc(*e, strlen(def));
194
if(new == NULL){
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){
195
233
return false;
196
234
}
197
*e = new;
198
strcpy(*e, def);
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
199
237
}
200
238
return true;
201
239
}
206
244
/*
207
245
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
246
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
248
*/
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
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));
214
252
/* If reading the flags failed, return error indication now. */
215
253
if(ret < 0){
216
254
return ret;
217
255
}
218
256
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
258
ret | FD_CLOEXEC));
220
259
}
221
260
222
261
223
262
/* Mark processes as completed when they exit, and save their exit
224
263
status. */
225
void handle_sigchld(__attribute__((unused)) int sig){
264
static void handle_sigchld(__attribute__((unused)) int sig){
265
int old_errno = errno;
226
266
while(true){
227
267
plugin *proc = plugin_list;
228
268
int status;
232
272
break;
233
273
}
234
274
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
275
if(errno == ECHILD){
276
/* No child processes */
277
break;
237
278
}
238
/* No child processes */
239
break;
279
error(0, errno, "waitpid");
240
280
}
241
281
242
282
/* A child exited, find it in process_list */
243
283
while(proc != NULL and proc->pid != pid){
244
284
proc = proc->next;
248
288
continue;
249
289
}
250
290
proc->status = status;
251
proc->completed = true;
291
proc->completed = 1;
252
292
}
293
errno = old_errno;
253
294
}
254
295
255
296
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
297
__attribute__((nonnull, warn_unused_result))
298
static bool print_out_password(const char *buffer, size_t length){
257
299
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
261
300
for(size_t written = 0; written < length; written += (size_t)ret){
262
301
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
263
302
length - written));
269
308
}
270
309
271
310
/* Removes and free a plugin from the plugin list */
311
__attribute__((nonnull))
272
312
static void free_plugin(plugin *plugin_node){
273
313
274
314
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
280
320
}
281
321
free(plugin_node->environ);
282
322
free(plugin_node->buffer);
283
323
284
324
/* Removes the plugin from the singly-linked list */
285
325
if(plugin_node == plugin_list){
286
326
/* First one - simple */
308
348
char *plugindir = NULL;
309
349
char *argfile = NULL;
310
350
FILE *conffp;
311
size_t d_name_len;
312
351
DIR *dir = NULL;
313
352
struct dirent *dirst;
314
353
struct stat st;
315
354
fd_set rfds_all;
316
355
int ret, maxfd = 0;
356
ssize_t sret;
317
357
uid_t uid = 65534;
318
358
gid_t gid = 65534;
319
359
bool debug = false;
323
363
.sa_flags = SA_NOCLDSTOP };
324
364
char **custom_argv = NULL;
325
365
int custom_argc = 0;
366
int dir_fd;
326
367
327
368
/* Establish a signal handler */
328
369
sigemptyset(&sigchld_action.sa_mask);
329
370
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
330
371
if(ret == -1){
331
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
372
error(0, errno, "sigaddset");
373
exitstatus = EX_OSERR;
333
374
goto fallback;
334
375
}
335
376
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
336
377
if(ret == -1){
337
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
378
error(0, errno, "sigaction");
379
exitstatus = EX_OSERR;
339
380
goto fallback;
340
381
}
341
382
373
414
.doc = "Group ID the plugins will run as", .group = 3 },
374
415
{ .name = "debug", .key = 132,
375
416
.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 },
376
426
{ .name = NULL }
377
427
};
378
428
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
381
switch (key) {
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;
382
435
case 'g': /* --global-options */
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;
436
{
437
char *plugin_option;
438
while((plugin_option = strsep(&arg, ",")) != NULL){
439
if(not add_argument(getplugin(NULL), plugin_option)){
440
break;
392
441
}
393
442
}
443
errno = 0;
394
444
}
395
445
break;
396
446
case 'G': /* --global-env */
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
}
447
if(add_environment(getplugin(NULL), arg, true)){
448
errno = 0;
408
449
}
409
450
break;
410
451
case 'o': /* --options-for */
411
if (arg != NULL){
412
char *p_name = strsep(&arg, ":");
413
if(p_name[0] == '\0'){
414
break;
415
}
416
char *opt = strsep(&arg, ":");
417
if(opt[0] == '\0'){
418
break;
419
}
420
if(opt != NULL){
421
char *p;
422
while((p = strsep(&opt, ",")) != NULL){
423
if(p[0] == '\0'){
424
continue;
425
}
426
if(not add_argument(getplugin(p_name), p)){
427
perror("add_argument");
428
return ARGP_ERR_UNKNOWN;
429
}
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;
430
470
}
431
471
}
472
errno = 0;
432
473
}
433
474
break;
434
475
case 'E': /* --env-for */
435
if(arg == NULL){
436
break;
437
}
438
476
{
439
477
char *envdef = strchr(arg, ':');
440
478
if(envdef == NULL){
441
break;
442
}
443
char *p_name = strndup(arg, (size_t) (envdef-arg));
444
if(p_name == NULL){
445
break;
446
}
479
argp_error(state, "No colon in \"%s\"", arg);
480
errno = EINVAL;
481
break;
482
}
483
*envdef = '\0';
447
484
envdef++;
448
if(not add_environment(getplugin(p_name), envdef, true)){
449
perror("add_environment");
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;
450
492
}
451
493
}
452
494
break;
453
495
case 'd': /* --disable */
454
if (arg != NULL){
496
{
455
497
plugin *p = getplugin(arg);
456
if(p == NULL){
457
return ARGP_ERR_UNKNOWN;
498
if(p != NULL){
499
p->disabled = true;
500
errno = 0;
458
501
}
459
p->disabled = true;
460
502
}
461
503
break;
462
504
case 'e': /* --enable */
463
if (arg != NULL){
505
{
464
506
plugin *p = getplugin(arg);
465
if(p == NULL){
466
return ARGP_ERR_UNKNOWN;
507
if(p != NULL){
508
p->disabled = false;
509
errno = 0;
467
510
}
468
p->disabled = false;
469
511
}
470
512
break;
471
513
case 128: /* --plugin-dir */
514
free(plugindir);
472
515
plugindir = strdup(arg);
473
if(plugindir == NULL){
474
perror("strdup");
475
}
516
if(plugindir != NULL){
517
errno = 0;
518
}
476
519
break;
477
520
case 129: /* --config-file */
478
521
/* This is already done by parse_opt_config_file() */
479
522
break;
480
523
case 130: /* --userid */
481
uid = (uid_t)strtol(arg, NULL, 10);
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;
482
533
break;
483
534
case 131: /* --groupid */
484
gid = (gid_t)strtol(arg, NULL, 10);
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;
485
544
break;
486
545
case 132: /* --debug */
487
546
debug = true;
488
547
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
*/
489
566
case ARGP_KEY_ARG:
490
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
491
break;
492
case ARGP_KEY_END:
493
break;
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
}
494
573
default:
495
574
return ARGP_ERR_UNKNOWN;
496
575
}
497
return 0;
576
return errno; /* Set to 0 at start */
498
577
}
499
578
500
579
/* This option parser is the same as parse_opt() above, except it
501
580
ignores everything but the --config-file option. */
502
error_t parse_opt_config_file (int key, char *arg,
503
__attribute__((unused))
504
struct argp_state *state) {
505
switch (key) {
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){
506
586
case 'g': /* --global-options */
507
587
case 'G': /* --global-env */
508
588
case 'o': /* --options-for */
512
592
case 128: /* --plugin-dir */
513
593
break;
514
594
case 129: /* --config-file */
595
free(argfile);
515
596
argfile = strdup(arg);
516
if(argfile == NULL){
517
perror("strdup");
597
if(argfile != NULL){
598
errno = 0;
518
599
}
519
break;
600
break;
520
601
case 130: /* --userid */
521
602
case 131: /* --groupid */
522
603
case 132: /* --debug */
604
case '?': /* --help */
605
case -3: /* --usage */
606
case 'V': /* --version */
523
607
case ARGP_KEY_ARG:
524
case ARGP_KEY_END:
525
608
break;
526
609
default:
527
610
return ARGP_ERR_UNKNOWN;
528
611
}
529
return 0;
612
return errno;
530
613
}
531
614
532
615
struct argp argp = { .options = options,
534
617
.args_doc = "",
535
618
.doc = "Mandos plugin runner -- Run plugins" };
536
619
537
/* Parse using the parse_opt_config_file in order to get the custom
620
/* Parse using parse_opt_config_file() in order to get the custom
538
621
config file location, if any. */
539
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
540
if (ret == ARGP_ERR_UNKNOWN){
541
fprintf(stderr, "Unknown error while parsing arguments\n");
542
exitstatus = EXIT_FAILURE;
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;
543
636
goto fallback;
544
637
}
545
638
547
640
argp.parser = parse_opt;
548
641
549
642
/* Open the configfile if available */
550
if (argfile == NULL){
643
if(argfile == NULL){
551
644
conffp = fopen(AFILE, "r");
552
645
} else {
553
646
conffp = fopen(argfile, "r");
554
}
647
}
555
648
if(conffp != NULL){
556
649
char *org_line = NULL;
557
650
char *p, *arg, *new_arg, *line;
558
651
size_t size = 0;
559
ssize_t sret;
560
652
const char whitespace_delims[] = " \r\t\f\v\n";
561
653
const char comment_delim[] = "#";
562
654
563
655
custom_argc = 1;
564
656
custom_argv = malloc(sizeof(char*) * 2);
565
657
if(custom_argv == NULL){
566
perror("malloc");
567
exitstatus = EXIT_FAILURE;
658
error(0, errno, "malloc");
659
exitstatus = EX_OSERR;
568
660
goto fallback;
569
661
}
570
662
custom_argv[0] = argv[0];
571
663
custom_argv[1] = NULL;
572
664
573
665
/* for each line in the config file, strip whitespace and ignore
574
666
commented text */
575
667
while(true){
577
669
if(sret == -1){
578
670
break;
579
671
}
580
672
581
673
line = org_line;
582
674
arg = strsep(&line, comment_delim);
583
675
while((p = strsep(&arg, whitespace_delims)) != NULL){
586
678
}
587
679
new_arg = strdup(p);
588
680
if(new_arg == NULL){
589
perror("strdup");
590
exitstatus = EXIT_FAILURE;
681
error(0, errno, "strdup");
682
exitstatus = EX_OSERR;
591
683
free(org_line);
592
684
goto fallback;
593
685
}
594
686
595
687
custom_argc += 1;
596
custom_argv = realloc(custom_argv, sizeof(char *)
597
* ((unsigned int) custom_argc + 1));
598
if(custom_argv == NULL){
599
perror("realloc");
600
exitstatus = EXIT_FAILURE;
601
free(org_line);
602
goto fallback;
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
}
603
701
}
604
702
custom_argv[custom_argc-1] = new_arg;
605
custom_argv[custom_argc] = NULL;
703
custom_argv[custom_argc] = NULL;
606
704
}
607
705
}
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
}
608
714
free(org_line);
609
715
} else {
610
716
/* Check for harmful errors and go to fallback. Other errors might
611
717
not affect opening plugins */
612
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
613
perror("fopen");
614
exitstatus = EXIT_FAILURE;
718
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
719
error(0, errno, "fopen");
720
exitstatus = EX_OSERR;
615
721
goto fallback;
616
722
}
617
723
}
618
/* If there was any arguments from configuration file,
619
pass them to parser as command arguments */
724
/* If there were any arguments from the configuration file, pass
725
them to parser as command line arguments */
620
726
if(custom_argv != NULL){
621
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
622
0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
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;
626
741
goto fallback;
627
742
}
628
743
}
629
744
630
745
/* Parse actual command line arguments, to let them override the
631
746
config file */
632
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
633
if (ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
exitstatus = EXIT_FAILURE;
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;
636
761
goto fallback;
637
762
}
638
763
643
768
for(char **a = p->argv; *a != NULL; a++){
644
769
fprintf(stderr, "\tArg: %s\n", *a);
645
770
}
646
fprintf(stderr, "...and %u environment variables\n", p->envc);
771
fprintf(stderr, "...and %d environment variables\n", p->envc);
647
772
for(char **a = p->environ; *a != NULL; a++){
648
773
fprintf(stderr, "\t%s\n", *a);
649
774
}
650
775
}
651
776
}
652
777
653
/* Strip permissions down to nobody */
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
}
654
807
ret = setuid(uid);
655
if (ret == -1){
656
perror("setuid");
657
}
658
setgid(gid);
659
if (ret == -1){
660
perror("setgid");
661
}
662
663
if (plugindir == NULL){
664
dir = opendir(PDIR);
665
} else {
666
dir = opendir(plugindir);
667
}
668
669
if(dir == NULL){
670
perror("Could not open plugin dir");
671
exitstatus = EXIT_FAILURE;
672
goto fallback;
673
}
674
675
/* Set the FD_CLOEXEC flag on the directory, if possible */
808
if(ret == -1){
809
error(0, errno, "setuid");
810
}
811
812
/* Open plugin directory with close_on_exec flag */
676
813
{
677
int dir_fd = dirfd(dir);
678
if(dir_fd >= 0){
679
ret = set_cloexec_flag(dir_fd);
680
if(ret < 0){
681
perror("set_cloexec_flag");
682
exitstatus = EXIT_FAILURE;
683
goto fallback;
684
}
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
TEMP_FAILURE_RETRY(close(dir_fd));
833
exitstatus = EX_OSERR;
834
goto fallback;
835
}
836
#endif /* O_CLOEXEC */
837
838
dir = fdopendir(dir_fd);
839
if(dir == NULL){
840
error(0, errno, "Could not open plugin dir");
841
TEMP_FAILURE_RETRY(close(dir_fd));
842
exitstatus = EX_OSERR;
843
goto fallback;
685
844
}
686
845
}
687
846
689
848
690
849
/* Read and execute any executable in the plugin directory*/
691
850
while(true){
692
dirst = readdir(dir);
851
do {
852
dirst = readdir(dir);
853
} while(dirst == NULL and errno == EINTR);
693
854
694
855
/* All directory entries have been processed */
695
856
if(dirst == NULL){
696
if (errno == EBADF){
697
perror("readdir");
698
exitstatus = EXIT_FAILURE;
857
if(errno == EBADF){
858
error(0, errno, "readdir");
859
exitstatus = EX_IOERR;
699
860
goto fallback;
700
861
}
701
862
break;
702
863
}
703
864
704
d_name_len = strlen(dirst->d_name);
705
706
865
/* Ignore dotfiles, backup files and other junk */
707
866
{
708
867
bool bad_name = false;
709
710
const char const *bad_prefixes[] = { ".", "#", NULL };
711
712
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
713
".dpkg-old",
714
".dpkg-divert", NULL };
715
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
716
size_t pre_len = strlen(*pre);
717
if((d_name_len >= pre_len)
718
and strncmp((dirst->d_name), *pre, pre_len) == 0){
719
if(debug){
720
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
721
" with bad prefix %s\n", dirst->d_name, *pre);
722
}
723
bad_name = true;
724
break;
725
}
726
}
727
if(bad_name){
728
continue;
729
}
730
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
731
size_t suf_len = strlen(*suf);
732
if((d_name_len >= suf_len)
733
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
734
== 0)){
735
if(debug){
736
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
737
" with bad suffix %s\n", dirst->d_name, *suf);
738
}
739
bad_name = true;
740
break;
741
}
742
}
743
744
if(bad_name){
745
continue;
746
}
747
}
748
749
char *filename;
750
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
868
const char * const patterns[] = { ".*", "#*#", "*~",
869
"*.dpkg-new", "*.dpkg-old",
870
"*.dpkg-bak", "*.dpkg-divert",
871
NULL };
872
#ifdef __GNUC__
873
#pragma GCC diagnostic push
874
#pragma GCC diagnostic ignored "-Wcast-qual"
875
#endif
876
for(const char **pat = (const char **)patterns;
877
*pat != NULL; pat++){
878
#ifdef __GNUC__
879
#pragma GCC diagnostic pop
880
#endif
881
if(fnmatch(*pat, dirst->d_name,
882
FNM_FILE_NAME | FNM_PERIOD) != FNM_NOMATCH){
883
if(debug){
884
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
885
" matching pattern %s\n", dirst->d_name, *pat);
886
}
887
bad_name = true;
888
break;
889
}
890
}
891
if(bad_name){
892
continue;
893
}
894
}
895
896
int plugin_fd = openat(dir_fd, dirst->d_name, O_RDONLY |
897
#ifdef O_CLOEXEC
898
O_CLOEXEC
899
#else /* not O_CLOEXEC */
900
0
901
#endif /* not O_CLOEXEC */
902
);
903
if(plugin_fd == -1){
904
error(0, errno, "Could not open plugin");
905
continue;
906
}
907
#ifndef O_CLOEXEC
908
/* Set the FD_CLOEXEC flag on the plugin FD */
909
ret = set_cloexec_flag(plugin_fd);
751
910
if(ret < 0){
752
perror("asprintf");
911
error(0, errno, "set_cloexec_flag");
912
TEMP_FAILURE_RETRY(close(plugin_fd));
913
continue;
914
}
915
#endif /* O_CLOEXEC */
916
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
917
if(ret == -1){
918
error(0, errno, "stat");
919
TEMP_FAILURE_RETRY(close(plugin_fd));
753
920
continue;
754
921
}
755
922
756
ret = stat(filename, &st);
757
if (ret == -1){
758
perror("stat");
759
free(filename);
760
continue;
761
}
762
763
923
/* Ignore non-executable files */
764
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
924
if(not S_ISREG(st.st_mode)
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, dirst->d_name, X_OK,
926
0)) != 0)){
765
927
if(debug){
766
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
767
" with bad type or mode\n", filename);
928
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
929
" with bad type or mode\n",
930
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
768
931
}
769
free(filename);
932
TEMP_FAILURE_RETRY(close(plugin_fd));
770
933
continue;
771
934
}
772
935
773
936
plugin *p = getplugin(dirst->d_name);
774
937
if(p == NULL){
775
perror("getplugin");
776
free(filename);
938
error(0, errno, "getplugin");
939
TEMP_FAILURE_RETRY(close(plugin_fd));
777
940
continue;
778
941
}
779
942
if(p->disabled){
781
944
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
782
945
dirst->d_name);
783
946
}
784
free(filename);
947
TEMP_FAILURE_RETRY(close(plugin_fd));
785
948
continue;
786
949
}
787
950
{
790
953
if(g != NULL){
791
954
for(char **a = g->argv + 1; *a != NULL; a++){
792
955
if(not add_argument(p, *a)){
793
perror("add_argument");
956
error(0, errno, "add_argument");
794
957
}
795
958
}
796
959
/* Add global environment variables */
797
960
for(char **e = g->environ; *e != NULL; e++){
798
961
if(not add_environment(p, *e, false)){
799
perror("add_environment");
962
error(0, errno, "add_environment");
800
963
}
801
964
}
802
965
}
803
966
}
804
/* If this plugin has any environment variables, we will call
805
using execve and need to duplicate the environment from this
806
process, too. */
967
/* If this plugin has any environment variables, we need to
968
duplicate the environment from this process, too. */
807
969
if(p->environ[0] != NULL){
808
970
for(char **e = environ; *e != NULL; e++){
809
971
if(not add_environment(p, *e, false)){
810
perror("add_environment");
972
error(0, errno, "add_environment");
811
973
}
812
974
}
813
975
}
814
976
815
977
int pipefd[2];
816
ret = pipe(pipefd);
817
if (ret == -1){
818
perror("pipe");
819
exitstatus = EXIT_FAILURE;
978
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
979
if(ret == -1){
980
error(0, errno, "pipe");
981
exitstatus = EX_OSERR;
820
982
goto fallback;
821
983
}
822
984
/* Ask OS to automatic close the pipe on exec */
823
985
ret = set_cloexec_flag(pipefd[0]);
824
986
if(ret < 0){
825
perror("set_cloexec_flag");
826
exitstatus = EXIT_FAILURE;
987
error(0, errno, "set_cloexec_flag");
988
TEMP_FAILURE_RETRY(close(pipefd[0]));
989
TEMP_FAILURE_RETRY(close(pipefd[1]));
990
exitstatus = EX_OSERR;
827
991
goto fallback;
828
992
}
829
993
ret = set_cloexec_flag(pipefd[1]);
830
994
if(ret < 0){
831
perror("set_cloexec_flag");
832
exitstatus = EXIT_FAILURE;
995
error(0, errno, "set_cloexec_flag");
996
TEMP_FAILURE_RETRY(close(pipefd[0]));
997
TEMP_FAILURE_RETRY(close(pipefd[1]));
998
exitstatus = EX_OSERR;
833
999
goto fallback;
834
1000
}
835
1001
/* Block SIGCHLD until process is safely in process list */
836
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1002
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1003
&sigchld_action.sa_mask,
1004
NULL));
837
1005
if(ret < 0){
838
perror("sigprocmask");
839
exitstatus = EXIT_FAILURE;
1006
error(0, errno, "sigprocmask");
1007
exitstatus = EX_OSERR;
840
1008
goto fallback;
841
1009
}
842
1010
/* Starting a new process to be watched */
843
pid_t pid = fork();
1011
pid_t pid;
1012
do {
1013
pid = fork();
1014
} while(pid == -1 and errno == EINTR);
844
1015
if(pid == -1){
845
perror("fork");
846
exitstatus = EXIT_FAILURE;
1016
error(0, errno, "fork");
1017
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1018
&sigchld_action.sa_mask, NULL));
1019
TEMP_FAILURE_RETRY(close(pipefd[0]));
1020
TEMP_FAILURE_RETRY(close(pipefd[1]));
1021
exitstatus = EX_OSERR;
847
1022
goto fallback;
848
1023
}
849
1024
if(pid == 0){
850
1025
/* this is the child process */
851
1026
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
852
1027
if(ret < 0){
853
perror("sigaction");
854
_exit(EXIT_FAILURE);
1028
error(0, errno, "sigaction");
1029
_exit(EX_OSERR);
855
1030
}
856
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1031
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
857
1032
if(ret < 0){
858
perror("sigprocmask");
859
_exit(EXIT_FAILURE);
1033
error(0, errno, "sigprocmask");
1034
_exit(EX_OSERR);
860
1035
}
861
1036
862
1037
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
863
1038
if(ret == -1){
864
perror("dup2");
865
_exit(EXIT_FAILURE);
1039
error(0, errno, "dup2");
1040
_exit(EX_OSERR);
866
1041
}
867
1042
868
1043
if(dirfd(dir) < 0){
870
1045
above and must now close it manually here. */
871
1046
closedir(dir);
872
1047
}
873
if(p->environ[0] == NULL){
874
if(execv(filename, p->argv) < 0){
875
perror("execv");
876
_exit(EXIT_FAILURE);
877
}
878
} else {
879
if(execve(filename, p->argv, p->environ) < 0){
880
perror("execve");
881
_exit(EXIT_FAILURE);
882
}
1048
if(fexecve(plugin_fd, p->argv,
1049
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1050
error(0, errno, "fexecve for %s/%s",
1051
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
1052
_exit(EX_OSERR);
883
1053
}
884
1054
/* no return */
885
1055
}
886
1056
/* Parent process */
887
close(pipefd[1]); /* Close unused write end of pipe */
888
free(filename);
1057
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1058
pipe */
1059
TEMP_FAILURE_RETRY(close(plugin_fd));
889
1060
plugin *new_plugin = getplugin(dirst->d_name);
890
if (new_plugin == NULL){
891
perror("getplugin");
892
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1061
if(new_plugin == NULL){
1062
error(0, errno, "getplugin");
1063
ret = (int)(TEMP_FAILURE_RETRY
1064
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1065
NULL)));
893
1066
if(ret < 0){
894
perror("sigprocmask");
1067
error(0, errno, "sigprocmask");
895
1068
}
896
exitstatus = EXIT_FAILURE;
1069
exitstatus = EX_OSERR;
897
1070
goto fallback;
898
1071
}
899
1072
902
1075
903
1076
/* Unblock SIGCHLD so signal handler can be run if this process
904
1077
has already completed */
905
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1078
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1079
&sigchld_action.sa_mask,
1080
NULL));
906
1081
if(ret < 0){
907
perror("sigprocmask");
908
exitstatus = EXIT_FAILURE;
1082
error(0, errno, "sigprocmask");
1083
exitstatus = EX_OSERR;
909
1084
goto fallback;
910
1085
}
911
1086
912
FD_SET(new_plugin->fd, &rfds_all);
1087
#if defined (__GNUC__) and defined (__GLIBC__)
1088
#if not __GLIBC_PREREQ(2, 16)
1089
#pragma GCC diagnostic push
1090
#pragma GCC diagnostic ignored "-Wsign-conversion"
1091
#endif
1092
#endif
1093
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1094
-Wconversion in GNU libc
1095
before 2.16 */
1096
#if defined (__GNUC__) and defined (__GLIBC__)
1097
#if not __GLIBC_PREREQ(2, 16)
1098
#pragma GCC diagnostic pop
1099
#endif
1100
#endif
913
1101
914
if (maxfd < new_plugin->fd){
1102
if(maxfd < new_plugin->fd){
915
1103
maxfd = new_plugin->fd;
916
1104
}
917
918
1105
}
919
1106
920
closedir(dir);
1107
TEMP_FAILURE_RETRY(closedir(dir));
921
1108
dir = NULL;
922
1109
free_plugin(getplugin(NULL));
1110
923
1111
for(plugin *p = plugin_list; p != NULL; p = p->next){
924
1112
if(p->pid != 0){
925
1113
break;
930
1118
free_plugin_list();
931
1119
}
932
1120
}
933
1121
934
1122
/* Main loop while running plugins exist */
935
1123
while(plugin_list){
936
1124
fd_set rfds = rfds_all;
937
1125
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
938
if (select_ret == -1){
939
perror("select");
940
exitstatus = EXIT_FAILURE;
1126
if(select_ret == -1 and errno != EINTR){
1127
error(0, errno, "select");
1128
exitstatus = EX_OSERR;
941
1129
goto fallback;
942
1130
}
943
1131
/* OK, now either a process completed, or something can be read
944
1132
from one of them */
945
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1133
for(plugin *proc = plugin_list; proc != NULL;){
946
1134
/* Is this process completely done? */
947
if(proc->eof and proc->completed){
1135
if(proc->completed and proc->eof){
948
1136
/* Only accept the plugin output if it exited cleanly */
949
1137
if(not WIFEXITED(proc->status)
950
1138
or WEXITSTATUS(proc->status) != 0){
951
1139
/* Bad exit by plugin */
952
1140
953
1141
if(debug){
954
1142
if(WIFEXITED(proc->status)){
955
fprintf(stderr, "Plugin %u exited with status %d\n",
956
(unsigned int) (proc->pid),
1143
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1144
" status %d\n", proc->name,
1145
(intmax_t) (proc->pid),
957
1146
WEXITSTATUS(proc->status));
958
} else if(WIFSIGNALED(proc->status)) {
959
fprintf(stderr, "Plugin %u killed by signal %d\n",
960
(unsigned int) (proc->pid),
961
WTERMSIG(proc->status));
1147
} else if(WIFSIGNALED(proc->status)){
1148
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1149
" signal %d: %s\n", proc->name,
1150
(intmax_t) (proc->pid),
1151
WTERMSIG(proc->status),
1152
strsignal(WTERMSIG(proc->status)));
962
1153
} else if(WCOREDUMP(proc->status)){
963
fprintf(stderr, "Plugin %d dumped core\n",
964
(unsigned int) (proc->pid));
1154
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1155
" core\n", proc->name, (intmax_t) (proc->pid));
965
1156
}
966
1157
}
967
1158
968
1159
/* Remove the plugin */
969
FD_CLR(proc->fd, &rfds_all);
970
1160
#if defined (__GNUC__) and defined (__GLIBC__)
1161
#if not __GLIBC_PREREQ(2, 16)
1162
#pragma GCC diagnostic push
1163
#pragma GCC diagnostic ignored "-Wsign-conversion"
1164
#endif
1165
#endif
1166
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1167
-Wconversion in GNU libc
1168
before 2.16 */
1169
#if defined (__GNUC__) and defined (__GLIBC__)
1170
#if not __GLIBC_PREREQ(2, 16)
1171
#pragma GCC diagnostic pop
1172
#endif
1173
#endif
1174
971
1175
/* Block signal while modifying process_list */
972
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1176
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1177
(SIG_BLOCK,
1178
&sigchld_action.sa_mask,
1179
NULL));
973
1180
if(ret < 0){
974
perror("sigprocmask");
975
exitstatus = EXIT_FAILURE;
1181
error(0, errno, "sigprocmask");
1182
exitstatus = EX_OSERR;
976
1183
goto fallback;
977
1184
}
1185
1186
plugin *next_plugin = proc->next;
978
1187
free_plugin(proc);
1188
proc = next_plugin;
1189
979
1190
/* We are done modifying process list, so unblock signal */
980
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
981
NULL);
1191
ret = (int)(TEMP_FAILURE_RETRY
1192
(sigprocmask(SIG_UNBLOCK,
1193
&sigchld_action.sa_mask, NULL)));
982
1194
if(ret < 0){
983
perror("sigprocmask");
984
exitstatus = EXIT_FAILURE;
1195
error(0, errno, "sigprocmask");
1196
exitstatus = EX_OSERR;
985
1197
goto fallback;
986
1198
}
987
1199
988
1200
if(plugin_list == NULL){
989
1201
break;
990
1202
}
1203
991
1204
continue;
992
1205
}
993
1206
994
1207
/* This process exited nicely, so print its buffer */
995
1208
996
1209
bool bret = print_out_password(proc->buffer,
997
1210
proc->buffer_length);
998
1211
if(not bret){
999
perror("print_out_password");
1000
exitstatus = EXIT_FAILURE;
1212
error(0, errno, "print_out_password");
1213
exitstatus = EX_IOERR;
1001
1214
}
1002
1215
goto fallback;
1003
1216
}
1004
1217
1005
1218
/* This process has not completed. Does it have any output? */
1006
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1219
#if defined (__GNUC__) and defined (__GLIBC__)
1220
#if not __GLIBC_PREREQ(2, 16)
1221
#pragma GCC diagnostic push
1222
#pragma GCC diagnostic ignored "-Wsign-conversion"
1223
#endif
1224
#endif
1225
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1226
warning from
1227
-Wconversion
1228
in GNU libc
1229
before
1230
2.16 */
1231
#if defined (__GNUC__) and defined (__GLIBC__)
1232
#if not __GLIBC_PREREQ(2, 16)
1233
#pragma GCC diagnostic pop
1234
#endif
1235
#endif
1007
1236
/* This process had nothing to say at this time */
1237
proc = proc->next;
1008
1238
continue;
1009
1239
}
1010
1240
/* Before reading, make the process' data buffer large enough */
1011
1241
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1013
+ (size_t) BUFFER_SIZE);
1014
if (proc->buffer == NULL){
1015
perror("malloc");
1016
exitstatus = EXIT_FAILURE;
1242
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1243
+ (size_t) BUFFER_SIZE);
1244
if(new_buffer == NULL){
1245
error(0, errno, "malloc");
1246
exitstatus = EX_OSERR;
1017
1247
goto fallback;
1018
1248
}
1249
proc->buffer = new_buffer;
1019
1250
proc->buffer_size += BUFFER_SIZE;
1020
1251
}
1021
1252
/* Read from the process */
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(ret < 0){
1253
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1254
proc->buffer
1255
+ proc->buffer_length,
1256
BUFFER_SIZE));
1257
if(sret < 0){
1025
1258
/* Read error from this process; ignore the error */
1259
proc = proc->next;
1026
1260
continue;
1027
1261
}
1028
if(ret == 0){
1262
if(sret == 0){
1029
1263
/* got EOF */
1030
1264
proc->eof = true;
1031
1265
} else {
1032
proc->buffer_length += (size_t) ret;
1266
proc->buffer_length += (size_t) sret;
1033
1267
}
1034
1268
}
1035
1269
}
1036
1037
1270
1271
1038
1272
fallback:
1039
1273
1040
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1274
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1275
and exitstatus != EX_OK)){
1041
1276
/* Fallback if all plugins failed, none are found or an error
1042
1277
occured */
1043
1278
bool bret;
1044
1279
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1045
1280
char *passwordbuffer = getpass("Password: ");
1046
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1281
size_t len = strlen(passwordbuffer);
1282
/* Strip trailing newline */
1283
if(len > 0 and passwordbuffer[len-1] == '\n'){
1284
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1285
len--;
1286
}
1287
bret = print_out_password(passwordbuffer, len);
1047
1288
if(not bret){
1048
perror("print_out_password");
1049
exitstatus = EXIT_FAILURE;
1289
error(0, errno, "print_out_password");
1290
exitstatus = EX_IOERR;
1050
1291
}
1051
1292
}
1052
1293
1053
1294
/* Restore old signal handler */
1054
1295
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1055
1296
if(ret == -1){
1056
perror("sigaction");
1057
exitstatus = EXIT_FAILURE;
1297
error(0, errno, "sigaction");
1298
exitstatus = EX_OSERR;
1058
1299
}
1059
1300
1060
1301
if(custom_argv != NULL){
1061
1302
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1062
1303
free(*arg);
1068
1309
closedir(dir);
1069
1310
}
1070
1311
1071
/* Free the process list and kill the processes */
1312
/* Kill the processes */
1072
1313
for(plugin *p = plugin_list; p != NULL; p = p->next){
1073
1314
if(p->pid != 0){
1074
1315
close(p->fd);
1075
1316
ret = kill(p->pid, SIGTERM);
1076
1317
if(ret == -1 and errno != ESRCH){
1077
1318
/* Set-uid proccesses might not get closed */
1078
perror("kill");
1319
error(0, errno, "kill");
1079
1320
}
1080
1321
}
1081
1322
}
1082
1323
1083
1324
/* Wait for any remaining child processes to terminate */
1084
do{
1325
do {
1085
1326
ret = wait(NULL);
1086
1327
} while(ret >= 0);
1087
1328
if(errno != ECHILD){
1088
perror("wait");
1329
error(0, errno, "wait");
1089
1330
}
1090
1331
1091
1332
free_plugin_list();
1092
1333
1093
1334
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0