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- Committer: Teddy Hogeborn
- Date: 2016-03-17 21:18:37 UTC
- Revision ID: teddy@recompile.se-20160317211837-f2tz0c9284rsv3k8
Client: Document default directories more clearly
Document default plugin directory and default plugin helper directory
also in the FILES section of the manual.
* plugin-runner.xml (FILES): Add "/lib/mandos/plugins.d" and
"/lib/mandos/plugin-helpers".
Document default plugin directory and default plugin helper directory
also in the FILES section of the manual.
* plugin-runner.xml (FILES): Add "/lib/mandos/plugins.d" and
"/lib/mandos/plugin-helpers".
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- 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 © 2008-2016 Teddy Hogeborn
6
* Copyright © 2008-2016 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, pipe2() */
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
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
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() */
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() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
40
WEXITSTATUS(), WTERMSIG() */
41
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
42
#include <iso646.h> /* and, or, not */
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() */
43
#include <dirent.h> /* struct dirent, scandirat() */
44
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
45
FD_CLOEXEC, write(), STDOUT_FILENO,
46
struct stat, fstat(), close(),
47
setgid(), setuid(), S_ISREG(),
48
faccessat() pipe2(), fork(),
49
_exit(), dup2(), fexecve(), read()
50
*/
52
51
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
52
FD_CLOEXEC, openat(), scandirat(),
53
pipe2() */
54
#include <string.h> /* strsep, strlen(), strsignal(),
55
strcmp(), strncmp() */
55
56
#include <errno.h> /* errno */
56
57
#include <argp.h> /* struct argp_option, struct
57
58
argp_state, struct argp,
61
62
#include <signal.h> /* struct sigaction, sigemptyset(),
62
63
sigaddset(), sigaction(),
63
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
SIG_UNBLOCK, kill(), sig_atomic_t
66
*/
65
67
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
69
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
70
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
71
#include <errno.h> /* errno */
72
#include <error.h> /* error() */
73
#include <fnmatch.h> /* fnmatch() */
66
74
67
75
#define BUFFER_SIZE 256
68
76
69
77
#define PDIR "/lib/mandos/plugins.d"
78
#define PHDIR "/lib/mandos/plugin-helpers"
70
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
80
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;
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
83
77
84
typedef struct plugin{
78
85
char *name; /* can be NULL or any plugin name */
81
88
char **environ;
82
89
int envc;
83
90
bool disabled;
84
91
85
92
/* Variables used for running processes*/
86
93
pid_t pid;
87
94
int fd;
89
96
size_t buffer_size;
90
97
size_t buffer_length;
91
98
bool eof;
92
volatile bool completed;
93
volatile int status;
99
volatile sig_atomic_t completed;
100
int status;
94
101
struct plugin *next;
95
102
} plugin;
96
103
98
105
99
106
/* Gets an existing plugin based on name,
100
107
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
101
109
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))){
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))){
106
114
return p;
107
115
}
108
116
}
109
117
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
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){
112
123
return NULL;
113
124
}
114
125
char *copy_name = NULL;
115
126
if(name != NULL){
116
copy_name = strdup(name);
127
do {
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
117
130
if(copy_name == NULL){
131
int e = errno;
132
free(new_plugin);
133
errno = e;
118
134
return NULL;
119
135
}
120
136
}
121
137
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
138
*new_plugin = (plugin){ .name = copy_name,
139
.argc = 1,
140
.disabled = false,
141
.next = plugin_list };
126
142
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
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;
129
148
free(copy_name);
130
149
free(new_plugin);
150
errno = e;
131
151
return NULL;
132
152
}
133
153
new_plugin->argv[0] = copy_name;
134
154
new_plugin->argv[1] = NULL;
135
155
136
new_plugin->environ = malloc(sizeof(char *));
156
do {
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
137
159
if(new_plugin->environ == NULL){
160
int e = errno;
138
161
free(copy_name);
139
162
free(new_plugin->argv);
140
163
free(new_plugin);
164
errno = e;
141
165
return NULL;
142
166
}
143
167
new_plugin->environ[0] = NULL;
148
172
}
149
173
150
174
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
151
176
static bool add_to_char_array(const char *new, char ***array,
152
177
int *len){
153
178
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
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);
156
184
/* Malloc check */
157
if(*array == NULL){
185
if(new_array == NULL){
158
186
return false;
159
187
}
188
*array = new_array;
160
189
/* Make a copy of the new string */
161
char *copy = strdup(new);
190
char *copy;
191
do {
192
copy = strdup(new);
193
} while(copy == NULL and errno == EINTR);
162
194
if(copy == NULL){
163
195
return false;
164
196
}
171
203
}
172
204
173
205
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
174
207
static bool add_argument(plugin *p, const char *arg){
175
208
if(p == NULL){
176
209
return false;
179
212
}
180
213
181
214
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
182
216
static bool add_environment(plugin *p, const char *def, bool replace){
183
217
if(p == NULL){
184
218
return false;
186
220
/* namelen = length of name of environment variable */
187
221
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
222
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
191
225
/* It already exists */
192
226
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
194
if(new == NULL){
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){
195
232
return false;
196
233
}
197
*e = new;
198
strcpy(*e, def);
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
199
236
}
200
237
return true;
201
238
}
203
240
return add_to_char_array(def, &(p->environ), &(p->envc));
204
241
}
205
242
243
#ifndef O_CLOEXEC
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
}
260
#endif /* not O_CLOEXEC */
221
261
222
262
223
263
/* Mark processes as completed when they exit, and save their exit
224
264
status. */
225
void handle_sigchld(__attribute__((unused)) int sig){
265
static void handle_sigchld(__attribute__((unused)) int sig){
266
int old_errno = errno;
226
267
while(true){
227
268
plugin *proc = plugin_list;
228
269
int status;
232
273
break;
233
274
}
234
275
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
276
if(errno == ECHILD){
277
/* No child processes */
278
break;
237
279
}
238
/* No child processes */
239
break;
280
error(0, errno, "waitpid");
240
281
}
241
282
242
283
/* A child exited, find it in process_list */
248
289
continue;
249
290
}
250
291
proc->status = status;
251
proc->completed = true;
292
proc->completed = 1;
252
293
}
294
errno = old_errno;
253
295
}
254
296
255
297
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
298
__attribute__((nonnull, warn_unused_result))
299
static bool print_out_password(const char *buffer, size_t length){
257
300
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
261
301
for(size_t written = 0; written < length; written += (size_t)ret){
262
302
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
263
303
length - written));
269
309
}
270
310
271
311
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
272
313
static void free_plugin(plugin *plugin_node){
273
314
274
315
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
280
321
}
281
322
free(plugin_node->environ);
282
323
free(plugin_node->buffer);
283
324
284
325
/* Removes the plugin from the singly-linked list */
285
326
if(plugin_node == plugin_list){
286
327
/* First one - simple */
306
347
307
348
int main(int argc, char *argv[]){
308
349
char *plugindir = NULL;
350
char *pluginhelperdir = NULL;
309
351
char *argfile = NULL;
310
352
FILE *conffp;
311
size_t d_name_len;
312
DIR *dir = NULL;
313
struct dirent *dirst;
353
struct dirent **direntries = NULL;
314
354
struct stat st;
315
355
fd_set rfds_all;
316
356
int ret, maxfd = 0;
357
ssize_t sret;
317
358
uid_t uid = 65534;
318
359
gid_t gid = 65534;
319
360
bool debug = false;
323
364
.sa_flags = SA_NOCLDSTOP };
324
365
char **custom_argv = NULL;
325
366
int custom_argc = 0;
367
int dir_fd = -1;
326
368
327
369
/* Establish a signal handler */
328
370
sigemptyset(&sigchld_action.sa_mask);
329
371
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
330
372
if(ret == -1){
331
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
373
error(0, errno, "sigaddset");
374
exitstatus = EX_OSERR;
333
375
goto fallback;
334
376
}
335
377
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
336
378
if(ret == -1){
337
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
379
error(0, errno, "sigaction");
380
exitstatus = EX_OSERR;
339
381
goto fallback;
340
382
}
341
383
373
415
.doc = "Group ID the plugins will run as", .group = 3 },
374
416
{ .name = "debug", .key = 132,
375
417
.doc = "Debug mode", .group = 4 },
418
{ .name = "plugin-helper-dir", .key = 133,
419
.arg = "DIRECTORY",
420
.doc = "Specify a different plugin helper directory",
421
.group = 2 },
422
/*
423
* These reproduce what we would get without ARGP_NO_HELP
424
*/
425
{ .name = "help", .key = '?',
426
.doc = "Give this help list", .group = -1 },
427
{ .name = "usage", .key = -3,
428
.doc = "Give a short usage message", .group = -1 },
429
{ .name = "version", .key = 'V',
430
.doc = "Print program version", .group = -1 },
376
431
{ .name = NULL }
377
432
};
378
433
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
381
switch (key) {
434
__attribute__((nonnull(3)))
435
error_t parse_opt(int key, char *arg, struct argp_state *state){
436
errno = 0;
437
switch(key){
438
char *tmp;
439
intmax_t tmp_id;
382
440
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;
441
{
442
char *plugin_option;
443
while((plugin_option = strsep(&arg, ",")) != NULL){
444
if(not add_argument(getplugin(NULL), plugin_option)){
445
break;
392
446
}
393
447
}
448
errno = 0;
394
449
}
395
450
break;
396
451
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
}
452
if(add_environment(getplugin(NULL), arg, true)){
453
errno = 0;
408
454
}
409
455
break;
410
456
case 'o': /* --options-for */
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
}
457
{
458
char *option_list = strchr(arg, ':');
459
if(option_list == NULL){
460
argp_error(state, "No colon in \"%s\"", arg);
461
errno = EINVAL;
462
break;
463
}
464
*option_list = '\0';
465
option_list++;
466
if(arg[0] == '\0'){
467
argp_error(state, "Empty plugin name");
468
errno = EINVAL;
469
break;
470
}
471
char *option;
472
while((option = strsep(&option_list, ",")) != NULL){
473
if(not add_argument(getplugin(arg), option)){
474
break;
475
}
476
}
477
errno = 0;
430
478
}
431
479
break;
432
480
case 'E': /* --env-for */
433
if(arg == NULL){
434
break;
435
}
436
481
{
437
482
char *envdef = strchr(arg, ':');
438
483
if(envdef == NULL){
439
break;
440
}
441
char *p_name = strndup(arg, (size_t) (envdef-arg));
442
if(p_name == NULL){
443
break;
444
}
484
argp_error(state, "No colon in \"%s\"", arg);
485
errno = EINVAL;
486
break;
487
}
488
*envdef = '\0';
445
489
envdef++;
446
if(not add_environment(getplugin(p_name), envdef, true)){
447
perror("add_environment");
490
if(arg[0] == '\0'){
491
argp_error(state, "Empty plugin name");
492
errno = EINVAL;
493
break;
494
}
495
if(add_environment(getplugin(arg), envdef, true)){
496
errno = 0;
448
497
}
449
498
}
450
499
break;
451
500
case 'd': /* --disable */
452
if (arg != NULL){
501
{
453
502
plugin *p = getplugin(arg);
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
503
if(p != NULL){
504
p->disabled = true;
505
errno = 0;
456
506
}
457
p->disabled = true;
458
507
}
459
508
break;
460
509
case 'e': /* --enable */
461
if (arg != NULL){
510
{
462
511
plugin *p = getplugin(arg);
463
if(p == NULL){
464
return ARGP_ERR_UNKNOWN;
512
if(p != NULL){
513
p->disabled = false;
514
errno = 0;
465
515
}
466
p->disabled = false;
467
516
}
468
517
break;
469
518
case 128: /* --plugin-dir */
519
free(plugindir);
470
520
plugindir = strdup(arg);
471
if(plugindir == NULL){
472
perror("strdup");
473
}
521
if(plugindir != NULL){
522
errno = 0;
523
}
474
524
break;
475
525
case 129: /* --config-file */
476
526
/* This is already done by parse_opt_config_file() */
477
527
break;
478
528
case 130: /* --userid */
479
uid = (uid_t)strtol(arg, NULL, 10);
529
tmp_id = strtoimax(arg, &tmp, 10);
530
if(errno != 0 or tmp == arg or *tmp != '\0'
531
or tmp_id != (uid_t)tmp_id){
532
argp_error(state, "Bad user ID number: \"%s\", using %"
533
PRIdMAX, arg, (intmax_t)uid);
534
break;
535
}
536
uid = (uid_t)tmp_id;
537
errno = 0;
480
538
break;
481
539
case 131: /* --groupid */
482
gid = (gid_t)strtol(arg, NULL, 10);
540
tmp_id = strtoimax(arg, &tmp, 10);
541
if(errno != 0 or tmp == arg or *tmp != '\0'
542
or tmp_id != (gid_t)tmp_id){
543
argp_error(state, "Bad group ID number: \"%s\", using %"
544
PRIdMAX, arg, (intmax_t)gid);
545
break;
546
}
547
gid = (gid_t)tmp_id;
548
errno = 0;
483
549
break;
484
550
case 132: /* --debug */
485
551
debug = true;
486
552
break;
553
case 133: /* --plugin-helper-dir */
554
free(pluginhelperdir);
555
pluginhelperdir = strdup(arg);
556
if(pluginhelperdir != NULL){
557
errno = 0;
558
}
559
break;
560
/*
561
* These reproduce what we would get without ARGP_NO_HELP
562
*/
563
case '?': /* --help */
564
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
565
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
566
case -3: /* --usage */
567
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
568
argp_state_help(state, state->out_stream,
569
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
570
case 'V': /* --version */
571
fprintf(state->out_stream, "%s\n", argp_program_version);
572
exit(EXIT_SUCCESS);
573
break;
574
/*
575
* When adding more options before this line, remember to also add a
576
* "case" to the "parse_opt_config_file" function below.
577
*/
487
578
case ARGP_KEY_ARG:
488
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
489
break;
490
case ARGP_KEY_END:
491
break;
579
/* Cryptsetup always passes an argument, which is an empty
580
string if "none" was specified in /etc/crypttab. So if
581
argument was empty, we ignore it silently. */
582
if(arg[0] == '\0'){
583
break;
584
}
492
585
default:
493
586
return ARGP_ERR_UNKNOWN;
494
587
}
495
return 0;
588
return errno; /* Set to 0 at start */
496
589
}
497
590
498
591
/* This option parser is the same as parse_opt() above, except it
499
592
ignores everything but the --config-file option. */
500
error_t parse_opt_config_file (int key, char *arg,
501
__attribute__((unused))
502
struct argp_state *state) {
503
switch (key) {
593
error_t parse_opt_config_file(int key, char *arg,
594
__attribute__((unused))
595
struct argp_state *state){
596
errno = 0;
597
switch(key){
504
598
case 'g': /* --global-options */
505
599
case 'G': /* --global-env */
506
600
case 'o': /* --options-for */
510
604
case 128: /* --plugin-dir */
511
605
break;
512
606
case 129: /* --config-file */
607
free(argfile);
513
608
argfile = strdup(arg);
514
if(argfile == NULL){
515
perror("strdup");
609
if(argfile != NULL){
610
errno = 0;
516
611
}
517
break;
612
break;
518
613
case 130: /* --userid */
519
614
case 131: /* --groupid */
520
615
case 132: /* --debug */
616
case 133: /* --plugin-helper-dir */
617
case '?': /* --help */
618
case -3: /* --usage */
619
case 'V': /* --version */
521
620
case ARGP_KEY_ARG:
522
case ARGP_KEY_END:
523
621
break;
524
622
default:
525
623
return ARGP_ERR_UNKNOWN;
526
624
}
527
return 0;
625
return errno;
528
626
}
529
627
530
628
struct argp argp = { .options = options,
532
630
.args_doc = "",
533
631
.doc = "Mandos plugin runner -- Run plugins" };
534
632
535
/* Parse using the parse_opt_config_file in order to get the custom
633
/* Parse using parse_opt_config_file() in order to get the custom
536
634
config file location, if any. */
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;
635
ret = argp_parse(&argp, argc, argv,
636
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
637
NULL, NULL);
638
switch(ret){
639
case 0:
640
break;
641
case ENOMEM:
642
default:
643
errno = ret;
644
error(0, errno, "argp_parse");
645
exitstatus = EX_OSERR;
646
goto fallback;
647
case EINVAL:
648
exitstatus = EX_USAGE;
541
649
goto fallback;
542
650
}
543
651
545
653
argp.parser = parse_opt;
546
654
547
655
/* Open the configfile if available */
548
if (argfile == NULL){
656
if(argfile == NULL){
549
657
conffp = fopen(AFILE, "r");
550
658
} else {
551
659
conffp = fopen(argfile, "r");
552
}
660
}
553
661
if(conffp != NULL){
554
662
char *org_line = NULL;
555
663
char *p, *arg, *new_arg, *line;
556
664
size_t size = 0;
557
ssize_t sret;
558
665
const char whitespace_delims[] = " \r\t\f\v\n";
559
666
const char comment_delim[] = "#";
560
667
561
668
custom_argc = 1;
562
669
custom_argv = malloc(sizeof(char*) * 2);
563
670
if(custom_argv == NULL){
564
perror("malloc");
565
exitstatus = EXIT_FAILURE;
671
error(0, errno, "malloc");
672
exitstatus = EX_OSERR;
566
673
goto fallback;
567
674
}
568
675
custom_argv[0] = argv[0];
569
676
custom_argv[1] = NULL;
570
677
571
678
/* for each line in the config file, strip whitespace and ignore
572
679
commented text */
573
680
while(true){
575
682
if(sret == -1){
576
683
break;
577
684
}
578
685
579
686
line = org_line;
580
687
arg = strsep(&line, comment_delim);
581
688
while((p = strsep(&arg, whitespace_delims)) != NULL){
584
691
}
585
692
new_arg = strdup(p);
586
693
if(new_arg == NULL){
587
perror("strdup");
588
exitstatus = EXIT_FAILURE;
694
error(0, errno, "strdup");
695
exitstatus = EX_OSERR;
589
696
free(org_line);
590
697
goto fallback;
591
698
}
592
699
593
700
custom_argc += 1;
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
{
702
char **new_argv = realloc(custom_argv, sizeof(char *)
703
* ((size_t)custom_argc + 1));
704
if(new_argv == NULL){
705
error(0, errno, "realloc");
706
exitstatus = EX_OSERR;
707
free(new_arg);
708
free(org_line);
709
goto fallback;
710
} else {
711
custom_argv = new_argv;
712
}
601
713
}
602
714
custom_argv[custom_argc-1] = new_arg;
603
custom_argv[custom_argc] = NULL;
715
custom_argv[custom_argc] = NULL;
604
716
}
605
717
}
718
do {
719
ret = fclose(conffp);
720
} while(ret == EOF and errno == EINTR);
721
if(ret == EOF){
722
error(0, errno, "fclose");
723
exitstatus = EX_IOERR;
724
goto fallback;
725
}
606
726
free(org_line);
607
727
} else {
608
728
/* Check for harmful errors and go to fallback. Other errors might
609
729
not affect opening plugins */
610
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
611
perror("fopen");
612
exitstatus = EXIT_FAILURE;
730
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
731
error(0, errno, "fopen");
732
exitstatus = EX_OSERR;
613
733
goto fallback;
614
734
}
615
735
}
616
/* If there was any arguments from configuration file,
617
pass them to parser as command arguments */
736
/* If there were any arguments from the configuration file, pass
737
them to parser as command line arguments */
618
738
if(custom_argv != NULL){
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;
739
ret = argp_parse(&argp, custom_argc, custom_argv,
740
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
741
NULL, NULL);
742
switch(ret){
743
case 0:
744
break;
745
case ENOMEM:
746
default:
747
errno = ret;
748
error(0, errno, "argp_parse");
749
exitstatus = EX_OSERR;
750
goto fallback;
751
case EINVAL:
752
exitstatus = EX_CONFIG;
624
753
goto fallback;
625
754
}
626
755
}
627
756
628
757
/* Parse actual command line arguments, to let them override the
629
758
config file */
630
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
631
if (ret == ARGP_ERR_UNKNOWN){
632
fprintf(stderr, "Unknown error while parsing arguments\n");
633
exitstatus = EXIT_FAILURE;
634
goto fallback;
759
ret = argp_parse(&argp, argc, argv,
760
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
761
NULL, NULL);
762
switch(ret){
763
case 0:
764
break;
765
case ENOMEM:
766
default:
767
errno = ret;
768
error(0, errno, "argp_parse");
769
exitstatus = EX_OSERR;
770
goto fallback;
771
case EINVAL:
772
exitstatus = EX_USAGE;
773
goto fallback;
774
}
775
776
{
777
char *pluginhelperenv;
778
bool bret = true;
779
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
780
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
781
if(ret != -1){
782
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
783
}
784
if(ret == -1 or not bret){
785
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
786
" environment variable to \"%s\" for all plugins\n",
787
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
788
}
789
if(ret != -1){
790
free(pluginhelperenv);
791
}
635
792
}
636
793
637
794
if(debug){
641
798
for(char **a = p->argv; *a != NULL; a++){
642
799
fprintf(stderr, "\tArg: %s\n", *a);
643
800
}
644
fprintf(stderr, "...and %u environment variables\n", p->envc);
801
fprintf(stderr, "...and %d environment variables\n", p->envc);
645
802
for(char **a = p->environ; *a != NULL; a++){
646
803
fprintf(stderr, "\t%s\n", *a);
647
804
}
648
805
}
649
806
}
650
807
651
/* Strip permissions down to nobody */
808
if(getuid() == 0){
809
/* Work around Debian bug #633582:
810
<http://bugs.debian.org/633582> */
811
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
812
if(plugindir_fd == -1){
813
if(errno != ENOENT){
814
error(0, errno, "open(\"" PDIR "\")");
815
}
816
} else {
817
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
818
if(ret == -1){
819
error(0, errno, "fstat");
820
} else {
821
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
822
ret = fchown(plugindir_fd, uid, gid);
823
if(ret == -1){
824
error(0, errno, "fchown");
825
}
826
}
827
}
828
close(plugindir_fd);
829
}
830
}
831
832
/* Lower permissions */
833
ret = setgid(gid);
834
if(ret == -1){
835
error(0, errno, "setgid");
836
}
652
837
ret = setuid(uid);
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 */
838
if(ret == -1){
839
error(0, errno, "setuid");
840
}
841
842
/* Open plugin directory with close_on_exec flag */
674
843
{
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;
844
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
845
#ifdef O_CLOEXEC
846
O_CLOEXEC
847
#else /* not O_CLOEXEC */
848
0
849
#endif /* not O_CLOEXEC */
850
);
851
if(dir_fd == -1){
852
error(0, errno, "Could not open plugin dir");
853
exitstatus = EX_UNAVAILABLE;
854
goto fallback;
855
}
856
857
#ifndef O_CLOEXEC
858
/* Set the FD_CLOEXEC flag on the directory */
859
ret = set_cloexec_flag(dir_fd);
860
if(ret < 0){
861
error(0, errno, "set_cloexec_flag");
862
exitstatus = EX_OSERR;
863
goto fallback;
864
}
865
#endif /* O_CLOEXEC */
866
}
867
868
int good_name(const struct dirent * const dirent){
869
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
870
"*.dpkg-old", "*.dpkg-bak",
871
"*.dpkg-divert", NULL };
872
#ifdef __GNUC__
873
#pragma GCC diagnostic push
874
#pragma GCC diagnostic ignored "-Wcast-qual"
875
#endif
876
for(const char **pat = (const char **)patterns;
877
*pat != NULL; pat++){
878
#ifdef __GNUC__
879
#pragma GCC diagnostic pop
880
#endif
881
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
882
!= FNM_NOMATCH){
883
if(debug){
884
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
885
" matching pattern %s\n", dirent->d_name, *pat);
886
}
887
return 0;
682
888
}
683
889
}
890
return 1;
891
}
892
893
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
894
alphasort);
895
if(numplugins == -1){
896
error(0, errno, "Could not scan plugin dir");
897
direntries = NULL;
898
exitstatus = EX_OSERR;
899
goto fallback;
684
900
}
685
901
686
902
FD_ZERO(&rfds_all);
687
903
688
904
/* Read and execute any executable in the plugin directory*/
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
905
for(int i = 0; i < numplugins; i++){
906
907
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
908
if(plugin_fd == -1){
909
error(0, errno, "Could not open plugin");
910
free(direntries[i]);
911
continue;
912
}
913
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
914
if(ret == -1){
915
error(0, errno, "stat");
916
close(plugin_fd);
917
free(direntries[i]);
918
continue;
919
}
920
761
921
/* Ignore non-executable files */
762
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
922
if(not S_ISREG(st.st_mode)
923
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
924
X_OK, 0)) != 0)){
763
925
if(debug){
764
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
765
" with bad type or mode\n", filename);
926
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
927
" with bad type or mode\n",
928
plugindir != NULL ? plugindir : PDIR,
929
direntries[i]->d_name);
766
930
}
767
free(filename);
931
close(plugin_fd);
932
free(direntries[i]);
768
933
continue;
769
934
}
770
935
771
plugin *p = getplugin(dirst->d_name);
936
plugin *p = getplugin(direntries[i]->d_name);
772
937
if(p == NULL){
773
perror("getplugin");
774
free(filename);
938
error(0, errno, "getplugin");
939
close(plugin_fd);
940
free(direntries[i]);
775
941
continue;
776
942
}
777
943
if(p->disabled){
778
944
if(debug){
779
945
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
780
dirst->d_name);
946
direntries[i]->d_name);
781
947
}
782
free(filename);
948
close(plugin_fd);
949
free(direntries[i]);
783
950
continue;
784
951
}
785
952
{
788
955
if(g != NULL){
789
956
for(char **a = g->argv + 1; *a != NULL; a++){
790
957
if(not add_argument(p, *a)){
791
perror("add_argument");
958
error(0, errno, "add_argument");
792
959
}
793
960
}
794
961
/* Add global environment variables */
795
962
for(char **e = g->environ; *e != NULL; e++){
796
963
if(not add_environment(p, *e, false)){
797
perror("add_environment");
964
error(0, errno, "add_environment");
798
965
}
799
966
}
800
967
}
801
968
}
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. */
969
/* If this plugin has any environment variables, we need to
970
duplicate the environment from this process, too. */
805
971
if(p->environ[0] != NULL){
806
972
for(char **e = environ; *e != NULL; e++){
807
973
if(not add_environment(p, *e, false)){
808
perror("add_environment");
974
error(0, errno, "add_environment");
809
975
}
810
976
}
811
977
}
812
978
813
979
int pipefd[2];
814
ret = pipe(pipefd);
815
if (ret == -1){
816
perror("pipe");
817
exitstatus = EXIT_FAILURE;
818
goto fallback;
819
}
980
#ifndef O_CLOEXEC
981
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
982
#else /* O_CLOEXEC */
983
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
984
#endif /* O_CLOEXEC */
985
if(ret == -1){
986
error(0, errno, "pipe");
987
exitstatus = EX_OSERR;
988
free(direntries[i]);
989
goto fallback;
990
}
991
if(pipefd[0] >= FD_SETSIZE){
992
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
993
FD_SETSIZE);
994
close(pipefd[0]);
995
close(pipefd[1]);
996
exitstatus = EX_OSERR;
997
free(direntries[i]);
998
goto fallback;
999
}
1000
#ifndef O_CLOEXEC
820
1001
/* Ask OS to automatic close the pipe on exec */
821
1002
ret = set_cloexec_flag(pipefd[0]);
822
1003
if(ret < 0){
823
perror("set_cloexec_flag");
824
exitstatus = EXIT_FAILURE;
1004
error(0, errno, "set_cloexec_flag");
1005
close(pipefd[0]);
1006
close(pipefd[1]);
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
825
1009
goto fallback;
826
1010
}
827
1011
ret = set_cloexec_flag(pipefd[1]);
828
1012
if(ret < 0){
829
perror("set_cloexec_flag");
830
exitstatus = EXIT_FAILURE;
1013
error(0, errno, "set_cloexec_flag");
1014
close(pipefd[0]);
1015
close(pipefd[1]);
1016
exitstatus = EX_OSERR;
1017
free(direntries[i]);
831
1018
goto fallback;
832
1019
}
1020
#endif /* not O_CLOEXEC */
833
1021
/* Block SIGCHLD until process is safely in process list */
834
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1022
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1023
&sigchld_action.sa_mask,
1024
NULL));
835
1025
if(ret < 0){
836
perror("sigprocmask");
837
exitstatus = EXIT_FAILURE;
1026
error(0, errno, "sigprocmask");
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
838
1029
goto fallback;
839
1030
}
840
1031
/* Starting a new process to be watched */
841
pid_t pid = fork();
1032
pid_t pid;
1033
do {
1034
pid = fork();
1035
} while(pid == -1 and errno == EINTR);
842
1036
if(pid == -1){
843
perror("fork");
844
exitstatus = EXIT_FAILURE;
1037
error(0, errno, "fork");
1038
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1039
&sigchld_action.sa_mask, NULL));
1040
close(pipefd[0]);
1041
close(pipefd[1]);
1042
exitstatus = EX_OSERR;
1043
free(direntries[i]);
845
1044
goto fallback;
846
1045
}
847
1046
if(pid == 0){
848
1047
/* this is the child process */
849
1048
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
850
1049
if(ret < 0){
851
perror("sigaction");
852
_exit(EXIT_FAILURE);
1050
error(0, errno, "sigaction");
1051
_exit(EX_OSERR);
853
1052
}
854
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1053
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
855
1054
if(ret < 0){
856
perror("sigprocmask");
857
_exit(EXIT_FAILURE);
1055
error(0, errno, "sigprocmask");
1056
_exit(EX_OSERR);
858
1057
}
859
1058
860
1059
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
861
1060
if(ret == -1){
862
perror("dup2");
863
_exit(EXIT_FAILURE);
1061
error(0, errno, "dup2");
1062
_exit(EX_OSERR);
864
1063
}
865
1064
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
}
1065
if(fexecve(plugin_fd, p->argv,
1066
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1067
error(0, errno, "fexecve for %s/%s",
1068
plugindir != NULL ? plugindir : PDIR,
1069
direntries[i]->d_name);
1070
_exit(EX_OSERR);
881
1071
}
882
1072
/* no return */
883
1073
}
884
1074
/* Parent process */
885
1075
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);
1076
close(plugin_fd);
1077
plugin *new_plugin = getplugin(direntries[i]->d_name);
1078
if(new_plugin == NULL){
1079
error(0, errno, "getplugin");
1080
ret = (int)(TEMP_FAILURE_RETRY
1081
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1082
NULL)));
891
1083
if(ret < 0){
892
perror("sigprocmask");
1084
error(0, errno, "sigprocmask");
893
1085
}
894
exitstatus = EXIT_FAILURE;
1086
exitstatus = EX_OSERR;
1087
free(direntries[i]);
895
1088
goto fallback;
896
1089
}
1090
free(direntries[i]);
897
1091
898
1092
new_plugin->pid = pid;
899
1093
new_plugin->fd = pipefd[0];
900
1094
901
1095
/* Unblock SIGCHLD so signal handler can be run if this process
902
1096
has already completed */
903
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1097
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1098
&sigchld_action.sa_mask,
1099
NULL));
904
1100
if(ret < 0){
905
perror("sigprocmask");
906
exitstatus = EXIT_FAILURE;
1101
error(0, errno, "sigprocmask");
1102
exitstatus = EX_OSERR;
907
1103
goto fallback;
908
1104
}
909
1105
910
1106
FD_SET(new_plugin->fd, &rfds_all);
911
1107
912
if (maxfd < new_plugin->fd){
1108
if(maxfd < new_plugin->fd){
913
1109
maxfd = new_plugin->fd;
914
1110
}
915
916
1111
}
917
1112
918
closedir(dir);
919
dir = NULL;
920
1113
free(direntries);
1114
direntries = NULL;
1115
close(dir_fd);
1116
dir_fd = -1;
1117
free_plugin(getplugin(NULL));
1118
921
1119
for(plugin *p = plugin_list; p != NULL; p = p->next){
922
1120
if(p->pid != 0){
923
1121
break;
928
1126
free_plugin_list();
929
1127
}
930
1128
}
931
1129
932
1130
/* Main loop while running plugins exist */
933
1131
while(plugin_list){
934
1132
fd_set rfds = rfds_all;
935
1133
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
936
if (select_ret == -1){
937
perror("select");
938
exitstatus = EXIT_FAILURE;
1134
if(select_ret == -1 and errno != EINTR){
1135
error(0, errno, "select");
1136
exitstatus = EX_OSERR;
939
1137
goto fallback;
940
1138
}
941
1139
/* OK, now either a process completed, or something can be read
942
1140
from one of them */
943
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1141
for(plugin *proc = plugin_list; proc != NULL;){
944
1142
/* Is this process completely done? */
945
if(proc->eof and proc->completed){
1143
if(proc->completed and proc->eof){
946
1144
/* Only accept the plugin output if it exited cleanly */
947
1145
if(not WIFEXITED(proc->status)
948
1146
or WEXITSTATUS(proc->status) != 0){
949
1147
/* Bad exit by plugin */
950
1148
951
1149
if(debug){
952
1150
if(WIFEXITED(proc->status)){
953
fprintf(stderr, "Plugin %u exited with status %d\n",
954
(unsigned int) (proc->pid),
1151
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1152
" status %d\n", proc->name,
1153
(intmax_t) (proc->pid),
955
1154
WEXITSTATUS(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));
960
} else if(WCOREDUMP(proc->status)){
961
fprintf(stderr, "Plugin %d dumped core\n",
962
(unsigned int) (proc->pid));
1155
} else if(WIFSIGNALED(proc->status)){
1156
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1157
" signal %d: %s\n", proc->name,
1158
(intmax_t) (proc->pid),
1159
WTERMSIG(proc->status),
1160
strsignal(WTERMSIG(proc->status)));
963
1161
}
964
1162
}
965
1163
966
1164
/* Remove the plugin */
967
1165
FD_CLR(proc->fd, &rfds_all);
968
1166
969
1167
/* Block signal while modifying process_list */
970
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1168
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1169
(SIG_BLOCK,
1170
&sigchld_action.sa_mask,
1171
NULL));
971
1172
if(ret < 0){
972
perror("sigprocmask");
973
exitstatus = EXIT_FAILURE;
1173
error(0, errno, "sigprocmask");
1174
exitstatus = EX_OSERR;
974
1175
goto fallback;
975
1176
}
1177
1178
plugin *next_plugin = proc->next;
976
1179
free_plugin(proc);
1180
proc = next_plugin;
1181
977
1182
/* We are done modifying process list, so unblock signal */
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
NULL);
1183
ret = (int)(TEMP_FAILURE_RETRY
1184
(sigprocmask(SIG_UNBLOCK,
1185
&sigchld_action.sa_mask, NULL)));
980
1186
if(ret < 0){
981
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
983
1189
goto fallback;
984
1190
}
985
1191
986
1192
if(plugin_list == NULL){
987
1193
break;
988
1194
}
1195
989
1196
continue;
990
1197
}
991
1198
992
1199
/* This process exited nicely, so print its buffer */
993
1200
994
1201
bool bret = print_out_password(proc->buffer,
995
1202
proc->buffer_length);
996
1203
if(not bret){
997
perror("print_out_password");
998
exitstatus = EXIT_FAILURE;
1204
error(0, errno, "print_out_password");
1205
exitstatus = EX_IOERR;
999
1206
}
1000
1207
goto fallback;
1001
1208
}
1003
1210
/* This process has not completed. Does it have any output? */
1004
1211
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1005
1212
/* This process had nothing to say at this time */
1213
proc = proc->next;
1006
1214
continue;
1007
1215
}
1008
1216
/* Before reading, make the process' data buffer large enough */
1009
1217
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
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;
1218
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1219
+ (size_t) BUFFER_SIZE);
1220
if(new_buffer == NULL){
1221
error(0, errno, "malloc");
1222
exitstatus = EX_OSERR;
1015
1223
goto fallback;
1016
1224
}
1225
proc->buffer = new_buffer;
1017
1226
proc->buffer_size += BUFFER_SIZE;
1018
1227
}
1019
1228
/* Read from the process */
1020
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1021
BUFFER_SIZE);
1022
if(ret < 0){
1229
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1230
proc->buffer
1231
+ proc->buffer_length,
1232
BUFFER_SIZE));
1233
if(sret < 0){
1023
1234
/* Read error from this process; ignore the error */
1235
proc = proc->next;
1024
1236
continue;
1025
1237
}
1026
if(ret == 0){
1238
if(sret == 0){
1027
1239
/* got EOF */
1028
1240
proc->eof = true;
1029
1241
} else {
1030
proc->buffer_length += (size_t) ret;
1242
proc->buffer_length += (size_t) sret;
1031
1243
}
1032
1244
}
1033
1245
}
1034
1035
1246
1247
1036
1248
fallback:
1037
1249
1038
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1250
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1251
and exitstatus != EX_OK)){
1039
1252
/* Fallback if all plugins failed, none are found or an error
1040
1253
occured */
1041
1254
bool bret;
1042
1255
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1043
1256
char *passwordbuffer = getpass("Password: ");
1044
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1257
size_t len = strlen(passwordbuffer);
1258
/* Strip trailing newline */
1259
if(len > 0 and passwordbuffer[len-1] == '\n'){
1260
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1261
len--;
1262
}
1263
bret = print_out_password(passwordbuffer, len);
1045
1264
if(not bret){
1046
perror("print_out_password");
1047
exitstatus = EXIT_FAILURE;
1265
error(0, errno, "print_out_password");
1266
exitstatus = EX_IOERR;
1048
1267
}
1049
1268
}
1050
1269
1051
1270
/* Restore old signal handler */
1052
1271
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1053
1272
if(ret == -1){
1054
perror("sigaction");
1055
exitstatus = EXIT_FAILURE;
1273
error(0, errno, "sigaction");
1274
exitstatus = EX_OSERR;
1056
1275
}
1057
1276
1058
1277
if(custom_argv != NULL){
1059
1278
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1060
1279
free(*arg);
1062
1281
free(custom_argv);
1063
1282
}
1064
1283
1065
if(dir != NULL){
1066
closedir(dir);
1284
free(direntries);
1285
1286
if(dir_fd != -1){
1287
close(dir_fd);
1067
1288
}
1068
1289
1069
/* Free the process list and kill the processes */
1290
/* Kill the processes */
1070
1291
for(plugin *p = plugin_list; p != NULL; p = p->next){
1071
1292
if(p->pid != 0){
1072
1293
close(p->fd);
1073
1294
ret = kill(p->pid, SIGTERM);
1074
1295
if(ret == -1 and errno != ESRCH){
1075
1296
/* Set-uid proccesses might not get closed */
1076
perror("kill");
1297
error(0, errno, "kill");
1077
1298
}
1078
1299
}
1079
1300
}
1080
1301
1081
1302
/* Wait for any remaining child processes to terminate */
1082
do{
1303
do {
1083
1304
ret = wait(NULL);
1084
1305
} while(ret >= 0);
1085
1306
if(errno != ECHILD){
1086
perror("wait");
1307
error(0, errno, "wait");
1087
1308
}
1088
1309
1089
1310
free_plugin_list();
1090
1311
1091
1312
free(plugindir);
1313
free(pluginhelperdir);
1092
1314
free(argfile);
1093
1315
1094
1316
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0