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- Committer: Teddy Hogeborn
- Date: 2015-07-12 01:41:14 UTC
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 325.
- Revision ID: teddy@recompile.se-20150712014114-qbala4mutkixxct3
Handle local Zeroconf service name collisions on startup, too.
* mandos (AvahiService.server_state_changed): Catch name collision
error when adding
server.
* mandos (AvahiService.server_state_changed): Catch name collision
error when adding
server.
- 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 © 2008-2014 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, 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
WCOREDUMP() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
43
#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() */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
55
57
#include <errno.h> /* errno */
56
58
#include <argp.h> /* struct argp_option, struct
57
59
argp_state, struct argp,
61
63
#include <signal.h> /* struct sigaction, sigemptyset(),
62
64
sigaddset(), sigaction(),
63
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
65
68
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
66
75
67
76
#define BUFFER_SIZE 256
68
77
69
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
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
136
new_plugin->environ = malloc(sizeof(char *));
156
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;
144
169
145
170
/* Append the new plugin to the list */
146
171
plugin_list = new_plugin;
147
172
return new_plugin;
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 */
182
static bool add_environment(plugin *p, const char *def){
216
__attribute__((nonnull(2), warn_unused_result))
217
static bool add_environment(plugin *p, const char *def, bool replace){
183
218
if(p == NULL){
184
219
return false;
185
220
}
221
/* namelen = length of name of environment variable */
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
/* Search for this environment variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
226
/* It already exists */
227
if(replace){
228
char *new_envdef;
229
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
233
return false;
234
}
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
237
}
238
return true;
239
}
240
}
186
241
return add_to_char_array(def, &(p->environ), &(p->envc));
187
242
}
188
243
244
#ifndef O_CLOEXEC
189
245
/*
190
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
191
247
* Descriptor Flags".
192
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
193
249
*/
194
static int set_cloexec_flag(int fd)
195
{
196
int ret = fcntl(fd, F_GETFD, 0);
250
__attribute__((warn_unused_result))
251
static int set_cloexec_flag(int fd){
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
197
253
/* If reading the flags failed, return error indication now. */
198
254
if(ret < 0){
199
255
return ret;
200
256
}
201
257
/* Store modified flag word in the descriptor. */
202
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
203
260
}
261
#endif /* not O_CLOEXEC */
204
262
205
263
206
264
/* Mark processes as completed when they exit, and save their exit
207
265
status. */
208
void handle_sigchld(__attribute__((unused)) int sig){
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
209
268
while(true){
210
269
plugin *proc = plugin_list;
211
270
int status;
215
274
break;
216
275
}
217
276
if(pid == -1){
218
if (errno != ECHILD){
219
perror("waitpid");
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
220
280
}
221
/* No child processes */
222
break;
281
error(0, errno, "waitpid");
223
282
}
224
283
225
284
/* A child exited, find it in process_list */
226
285
while(proc != NULL and proc->pid != pid){
227
286
proc = proc->next;
231
290
continue;
232
291
}
233
292
proc->status = status;
234
proc->completed = true;
293
proc->completed = 1;
235
294
}
295
errno = old_errno;
236
296
}
237
297
238
298
/* Prints out a password to stdout */
239
bool print_out_password(const char *buffer, size_t length){
299
__attribute__((nonnull, warn_unused_result))
300
static bool print_out_password(const char *buffer, size_t length){
240
301
ssize_t ret;
241
if(length>0 and buffer[length-1] == '\n'){
242
length--;
243
}
244
302
for(size_t written = 0; written < length; written += (size_t)ret){
245
303
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
246
304
length - written));
252
310
}
253
311
254
312
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
255
314
static void free_plugin(plugin *plugin_node){
256
315
257
316
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
263
322
}
264
323
free(plugin_node->environ);
265
324
free(plugin_node->buffer);
266
325
267
326
/* Removes the plugin from the singly-linked list */
268
327
if(plugin_node == plugin_list){
269
328
/* First one - simple */
289
348
290
349
int main(int argc, char *argv[]){
291
350
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
292
352
char *argfile = NULL;
293
353
FILE *conffp;
294
size_t d_name_len;
295
DIR *dir = NULL;
296
struct dirent *dirst;
354
struct dirent **direntries = NULL;
297
355
struct stat st;
298
356
fd_set rfds_all;
299
357
int ret, maxfd = 0;
358
ssize_t sret;
300
359
uid_t uid = 65534;
301
360
gid_t gid = 65534;
302
361
bool debug = false;
306
365
.sa_flags = SA_NOCLDSTOP };
307
366
char **custom_argv = NULL;
308
367
int custom_argc = 0;
368
int dir_fd = -1;
309
369
310
370
/* Establish a signal handler */
311
371
sigemptyset(&sigchld_action.sa_mask);
312
372
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
313
373
if(ret == -1){
314
perror("sigaddset");
315
exitstatus = EXIT_FAILURE;
374
error(0, errno, "sigaddset");
375
exitstatus = EX_OSERR;
316
376
goto fallback;
317
377
}
318
378
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
319
379
if(ret == -1){
320
perror("sigaction");
321
exitstatus = EXIT_FAILURE;
380
error(0, errno, "sigaction");
381
exitstatus = EX_OSERR;
322
382
goto fallback;
323
383
}
324
384
327
387
{ .name = "global-options", .key = 'g',
328
388
.arg = "OPTION[,OPTION[,...]]",
329
389
.doc = "Options passed to all plugins" },
330
{ .name = "global-envs", .key = 'e',
390
{ .name = "global-env", .key = 'G',
331
391
.arg = "VAR=value",
332
392
.doc = "Environment variable passed to all plugins" },
333
393
{ .name = "options-for", .key = 'o',
334
394
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
335
395
.doc = "Options passed only to specified plugin" },
336
{ .name = "envs-for", .key = 'f',
396
{ .name = "env-for", .key = 'E',
337
397
.arg = "PLUGIN:ENV=value",
338
398
.doc = "Environment variable passed to specified plugin" },
339
399
{ .name = "disable", .key = 'd',
340
400
.arg = "PLUGIN",
341
401
.doc = "Disable a specific plugin", .group = 1 },
402
{ .name = "enable", .key = 'e',
403
.arg = "PLUGIN",
404
.doc = "Enable a specific plugin", .group = 1 },
342
405
{ .name = "plugin-dir", .key = 128,
343
406
.arg = "DIRECTORY",
344
407
.doc = "Specify a different plugin directory", .group = 2 },
353
416
.doc = "Group ID the plugins will run as", .group = 3 },
354
417
{ .name = "debug", .key = 132,
355
418
.doc = "Debug mode", .group = 4 },
419
{ .name = "plugin-helper-dir", .key = 133,
420
.arg = "DIRECTORY",
421
.doc = "Specify a different plugin helper directory",
422
.group = 2 },
423
/*
424
* These reproduce what we would get without ARGP_NO_HELP
425
*/
426
{ .name = "help", .key = '?',
427
.doc = "Give this help list", .group = -1 },
428
{ .name = "usage", .key = -3,
429
.doc = "Give a short usage message", .group = -1 },
430
{ .name = "version", .key = 'V',
431
.doc = "Print program version", .group = -1 },
356
432
{ .name = NULL }
357
433
};
358
434
359
error_t parse_opt (int key, char *arg, __attribute__((unused)) struct argp_state *state) {
360
/* Get the INPUT argument from `argp_parse', which we know is a
361
pointer to our plugin list pointer. */
362
switch (key) {
435
__attribute__((nonnull(3)))
436
error_t parse_opt(int key, char *arg, struct argp_state *state){
437
errno = 0;
438
switch(key){
439
char *tmp;
440
intmax_t tmp_id;
363
441
case 'g': /* --global-options */
364
if (arg != NULL){
365
char *p;
366
while((p = strsep(&arg, ",")) != NULL){
367
if(p[0] == '\0'){
368
continue;
369
}
370
if(not add_argument(getplugin(NULL), p)){
371
perror("add_argument");
372
return ARGP_ERR_UNKNOWN;
373
}
374
}
375
}
376
break;
377
case 'e': /* --global-envs */
378
if(arg == NULL){
379
break;
380
}
381
442
{
382
char *envdef = strdup(arg);
383
if(envdef == NULL){
384
break;
385
}
386
if(not add_environment(getplugin(NULL), envdef)){
387
perror("add_environment");
388
}
443
char *plugin_option;
444
while((plugin_option = strsep(&arg, ",")) != NULL){
445
if(not add_argument(getplugin(NULL), plugin_option)){
446
break;
447
}
448
}
449
errno = 0;
450
}
451
break;
452
case 'G': /* --global-env */
453
if(add_environment(getplugin(NULL), arg, true)){
454
errno = 0;
389
455
}
390
456
break;
391
457
case 'o': /* --options-for */
392
if (arg != NULL){
393
char *p_name = strsep(&arg, ":");
394
if(p_name[0] == '\0'){
395
break;
396
}
397
char *opt = strsep(&arg, ":");
398
if(opt[0] == '\0'){
399
break;
400
}
401
if(opt != NULL){
402
char *p;
403
while((p = strsep(&opt, ",")) != NULL){
404
if(p[0] == '\0'){
405
continue;
406
}
407
if(not add_argument(getplugin(p_name), p)){
408
perror("add_argument");
409
return ARGP_ERR_UNKNOWN;
410
}
458
{
459
char *option_list = strchr(arg, ':');
460
if(option_list == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
463
break;
464
}
465
*option_list = '\0';
466
option_list++;
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
471
}
472
char *option;
473
while((option = strsep(&option_list, ",")) != NULL){
474
if(not add_argument(getplugin(arg), option)){
475
break;
411
476
}
412
477
}
478
errno = 0;
413
479
}
414
480
break;
415
case 'f': /* --envs-for */
416
if(arg == NULL){
417
break;
418
}
481
case 'E': /* --env-for */
419
482
{
420
483
char *envdef = strchr(arg, ':');
421
484
if(envdef == NULL){
422
break;
423
}
424
char *p_name = strndup(arg, (size_t) (envdef-arg));
425
if(p_name == NULL){
426
break;
427
}
485
argp_error(state, "No colon in \"%s\"", arg);
486
errno = EINVAL;
487
break;
488
}
489
*envdef = '\0';
428
490
envdef++;
429
if(not add_environment(getplugin(p_name), envdef)){
430
perror("add_environment");
491
if(arg[0] == '\0'){
492
argp_error(state, "Empty plugin name");
493
errno = EINVAL;
494
break;
495
}
496
if(add_environment(getplugin(arg), envdef, true)){
497
errno = 0;
431
498
}
432
499
}
433
500
break;
434
501
case 'd': /* --disable */
435
if (arg != NULL){
436
plugin *p = getplugin(arg);
437
if(p == NULL){
438
return ARGP_ERR_UNKNOWN;
439
}
440
p->disabled = true;
502
{
503
plugin *p = getplugin(arg);
504
if(p != NULL){
505
p->disabled = true;
506
errno = 0;
507
}
508
}
509
break;
510
case 'e': /* --enable */
511
{
512
plugin *p = getplugin(arg);
513
if(p != NULL){
514
p->disabled = false;
515
errno = 0;
516
}
441
517
}
442
518
break;
443
519
case 128: /* --plugin-dir */
520
free(plugindir);
444
521
plugindir = strdup(arg);
445
if(plugindir == NULL){
446
perror("strdup");
447
}
448
break;
449
case 129: /* --config-file */
522
if(plugindir != NULL){
523
errno = 0;
524
}
525
break;
526
case 129: /* --config-file */
527
/* This is already done by parse_opt_config_file() */
528
break;
529
case 130: /* --userid */
530
tmp_id = strtoimax(arg, &tmp, 10);
531
if(errno != 0 or tmp == arg or *tmp != '\0'
532
or tmp_id != (uid_t)tmp_id){
533
argp_error(state, "Bad user ID number: \"%s\", using %"
534
PRIdMAX, arg, (intmax_t)uid);
535
break;
536
}
537
uid = (uid_t)tmp_id;
538
errno = 0;
539
break;
540
case 131: /* --groupid */
541
tmp_id = strtoimax(arg, &tmp, 10);
542
if(errno != 0 or tmp == arg or *tmp != '\0'
543
or tmp_id != (gid_t)tmp_id){
544
argp_error(state, "Bad group ID number: \"%s\", using %"
545
PRIdMAX, arg, (intmax_t)gid);
546
break;
547
}
548
gid = (gid_t)tmp_id;
549
errno = 0;
550
break;
551
case 132: /* --debug */
552
debug = true;
553
break;
554
case 133: /* --plugin-helper-dir */
555
free(pluginhelperdir);
556
pluginhelperdir = strdup(arg);
557
if(pluginhelperdir != NULL){
558
errno = 0;
559
}
560
break;
561
/*
562
* These reproduce what we would get without ARGP_NO_HELP
563
*/
564
case '?': /* --help */
565
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
566
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
567
case -3: /* --usage */
568
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
569
argp_state_help(state, state->out_stream,
570
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
571
case 'V': /* --version */
572
fprintf(state->out_stream, "%s\n", argp_program_version);
573
exit(EXIT_SUCCESS);
574
break;
575
/*
576
* When adding more options before this line, remember to also add a
577
* "case" to the "parse_opt_config_file" function below.
578
*/
579
case ARGP_KEY_ARG:
580
/* Cryptsetup always passes an argument, which is an empty
581
string if "none" was specified in /etc/crypttab. So if
582
argument was empty, we ignore it silently. */
583
if(arg[0] == '\0'){
584
break;
585
}
586
default:
587
return ARGP_ERR_UNKNOWN;
588
}
589
return errno; /* Set to 0 at start */
590
}
591
592
/* This option parser is the same as parse_opt() above, except it
593
ignores everything but the --config-file option. */
594
error_t parse_opt_config_file(int key, char *arg,
595
__attribute__((unused))
596
struct argp_state *state){
597
errno = 0;
598
switch(key){
599
case 'g': /* --global-options */
600
case 'G': /* --global-env */
601
case 'o': /* --options-for */
602
case 'E': /* --env-for */
603
case 'd': /* --disable */
604
case 'e': /* --enable */
605
case 128: /* --plugin-dir */
606
break;
607
case 129: /* --config-file */
608
free(argfile);
450
609
argfile = strdup(arg);
451
if(argfile == NULL){
452
perror("strdup");
610
if(argfile != NULL){
611
errno = 0;
453
612
}
454
break;
613
break;
455
614
case 130: /* --userid */
456
uid = (uid_t)strtol(arg, NULL, 10);
457
break;
458
615
case 131: /* --groupid */
459
gid = (gid_t)strtol(arg, NULL, 10);
460
break;
461
616
case 132: /* --debug */
462
debug = true;
463
break;
617
case 133: /* --plugin-helper-dir */
618
case '?': /* --help */
619
case -3: /* --usage */
620
case 'V': /* --version */
464
621
case ARGP_KEY_ARG:
465
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
466
break;
467
case ARGP_KEY_END:
468
622
break;
469
623
default:
470
624
return ARGP_ERR_UNKNOWN;
471
625
}
472
return 0;
626
return errno;
473
627
}
474
628
475
struct argp argp = { .options = options, .parser = parse_opt,
476
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
629
struct argp argp = { .options = options,
630
.parser = parse_opt_config_file,
631
.args_doc = "",
477
632
.doc = "Mandos plugin runner -- Run plugins" };
478
633
479
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
480
if (ret == ARGP_ERR_UNKNOWN){
481
fprintf(stderr, "Unknown error while parsing arguments\n");
482
exitstatus = EXIT_FAILURE;
634
/* Parse using parse_opt_config_file() in order to get the custom
635
config file location, if any. */
636
ret = argp_parse(&argp, argc, argv,
637
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
638
NULL, NULL);
639
switch(ret){
640
case 0:
641
break;
642
case ENOMEM:
643
default:
644
errno = ret;
645
error(0, errno, "argp_parse");
646
exitstatus = EX_OSERR;
647
goto fallback;
648
case EINVAL:
649
exitstatus = EX_USAGE;
483
650
goto fallback;
484
651
}
485
486
/* Opens the configfile if aviable */
487
if (argfile == NULL){
652
653
/* Reset to the normal argument parser */
654
argp.parser = parse_opt;
655
656
/* Open the configfile if available */
657
if(argfile == NULL){
488
658
conffp = fopen(AFILE, "r");
489
659
} else {
490
660
conffp = fopen(argfile, "r");
491
}
661
}
492
662
if(conffp != NULL){
493
663
char *org_line = NULL;
494
664
char *p, *arg, *new_arg, *line;
495
665
size_t size = 0;
496
ssize_t sret;
497
666
const char whitespace_delims[] = " \r\t\f\v\n";
498
667
const char comment_delim[] = "#";
499
668
500
669
custom_argc = 1;
501
670
custom_argv = malloc(sizeof(char*) * 2);
502
671
if(custom_argv == NULL){
503
perror("malloc");
504
exitstatus = EXIT_FAILURE;
672
error(0, errno, "malloc");
673
exitstatus = EX_OSERR;
505
674
goto fallback;
506
675
}
507
676
custom_argv[0] = argv[0];
508
677
custom_argv[1] = NULL;
509
510
/* for each line in the config file, strip whitespace and ignore commented text */
678
679
/* for each line in the config file, strip whitespace and ignore
680
commented text */
511
681
while(true){
512
682
sret = getline(&org_line, &size, conffp);
513
683
if(sret == -1){
514
684
break;
515
685
}
516
686
517
687
line = org_line;
518
688
arg = strsep(&line, comment_delim);
519
689
while((p = strsep(&arg, whitespace_delims)) != NULL){
522
692
}
523
693
new_arg = strdup(p);
524
694
if(new_arg == NULL){
525
perror("strdup");
526
exitstatus = EXIT_FAILURE;
695
error(0, errno, "strdup");
696
exitstatus = EX_OSERR;
527
697
free(org_line);
528
698
goto fallback;
529
699
}
530
700
531
701
custom_argc += 1;
532
custom_argv = realloc(custom_argv, sizeof(char *)
533
* ((unsigned int) custom_argc + 1));
534
if(custom_argv == NULL){
535
perror("realloc");
536
exitstatus = EXIT_FAILURE;
537
free(org_line);
538
goto fallback;
702
{
703
char **new_argv = realloc(custom_argv, sizeof(char *)
704
* ((unsigned int)
705
custom_argc + 1));
706
if(new_argv == NULL){
707
error(0, errno, "realloc");
708
exitstatus = EX_OSERR;
709
free(new_arg);
710
free(org_line);
711
goto fallback;
712
} else {
713
custom_argv = new_argv;
714
}
539
715
}
540
716
custom_argv[custom_argc-1] = new_arg;
541
custom_argv[custom_argc] = NULL;
717
custom_argv[custom_argc] = NULL;
542
718
}
543
719
}
720
do {
721
ret = fclose(conffp);
722
} while(ret == EOF and errno == EINTR);
723
if(ret == EOF){
724
error(0, errno, "fclose");
725
exitstatus = EX_IOERR;
726
goto fallback;
727
}
544
728
free(org_line);
545
} else{
729
} else {
546
730
/* Check for harmful errors and go to fallback. Other errors might
547
731
not affect opening plugins */
548
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
549
perror("fopen");
550
exitstatus = EXIT_FAILURE;
732
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
733
error(0, errno, "fopen");
734
exitstatus = EX_OSERR;
551
735
goto fallback;
552
736
}
553
737
}
554
/* If there was any arguments from configuration file,
555
pass them to parser as command arguments */
738
/* If there were any arguments from the configuration file, pass
739
them to parser as command line arguments */
556
740
if(custom_argv != NULL){
557
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
558
if (ret == ARGP_ERR_UNKNOWN){
559
fprintf(stderr, "Unknown error while parsing arguments\n");
560
exitstatus = EXIT_FAILURE;
561
goto fallback;
741
ret = argp_parse(&argp, custom_argc, custom_argv,
742
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
743
NULL, NULL);
744
switch(ret){
745
case 0:
746
break;
747
case ENOMEM:
748
default:
749
errno = ret;
750
error(0, errno, "argp_parse");
751
exitstatus = EX_OSERR;
752
goto fallback;
753
case EINVAL:
754
exitstatus = EX_CONFIG;
755
goto fallback;
756
}
757
}
758
759
/* Parse actual command line arguments, to let them override the
760
config file */
761
ret = argp_parse(&argp, argc, argv,
762
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
763
NULL, NULL);
764
switch(ret){
765
case 0:
766
break;
767
case ENOMEM:
768
default:
769
errno = ret;
770
error(0, errno, "argp_parse");
771
exitstatus = EX_OSERR;
772
goto fallback;
773
case EINVAL:
774
exitstatus = EX_USAGE;
775
goto fallback;
776
}
777
778
{
779
char *pluginhelperenv;
780
bool bret = true;
781
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
782
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
783
if(ret != -1){
784
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
785
}
786
if(ret == -1 or not bret){
787
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
788
" environment variable to \"%s\" for all plugins\n",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
790
}
791
if(ret != -1){
792
free(pluginhelperenv);
562
793
}
563
794
}
564
795
569
800
for(char **a = p->argv; *a != NULL; a++){
570
801
fprintf(stderr, "\tArg: %s\n", *a);
571
802
}
572
fprintf(stderr, "...and %u environment variables\n", p->envc);
803
fprintf(stderr, "...and %d environment variables\n", p->envc);
573
804
for(char **a = p->environ; *a != NULL; a++){
574
805
fprintf(stderr, "\t%s\n", *a);
575
806
}
576
807
}
577
808
}
578
579
/* Strip permissions down to nobody */
809
810
if(getuid() == 0){
811
/* Work around Debian bug #633582:
812
<http://bugs.debian.org/633582> */
813
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
814
if(plugindir_fd == -1){
815
if(errno != ENOENT){
816
error(0, errno, "open(\"" PDIR "\")");
817
}
818
} else {
819
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
820
if(ret == -1){
821
error(0, errno, "fstat");
822
} else {
823
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
824
ret = fchown(plugindir_fd, uid, gid);
825
if(ret == -1){
826
error(0, errno, "fchown");
827
}
828
}
829
}
830
TEMP_FAILURE_RETRY(close(plugindir_fd));
831
}
832
}
833
834
/* Lower permissions */
835
ret = setgid(gid);
836
if(ret == -1){
837
error(0, errno, "setgid");
838
}
580
839
ret = setuid(uid);
581
if (ret == -1){
582
perror("setuid");
583
}
584
setgid(gid);
585
if (ret == -1){
586
perror("setgid");
587
}
588
589
if (plugindir == NULL){
590
dir = opendir(PDIR);
591
} else {
592
dir = opendir(plugindir);
593
}
594
595
if(dir == NULL){
596
perror("Could not open plugin dir");
597
exitstatus = EXIT_FAILURE;
598
goto fallback;
599
}
600
601
/* Set the FD_CLOEXEC flag on the directory, if possible */
840
if(ret == -1){
841
error(0, errno, "setuid");
842
}
843
844
/* Open plugin directory with close_on_exec flag */
602
845
{
603
int dir_fd = dirfd(dir);
604
if(dir_fd >= 0){
605
ret = set_cloexec_flag(dir_fd);
606
if(ret < 0){
607
perror("set_cloexec_flag");
608
exitstatus = EXIT_FAILURE;
609
goto fallback;
846
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
847
#ifdef O_CLOEXEC
848
O_CLOEXEC
849
#else /* not O_CLOEXEC */
850
0
851
#endif /* not O_CLOEXEC */
852
);
853
if(dir_fd == -1){
854
error(0, errno, "Could not open plugin dir");
855
exitstatus = EX_UNAVAILABLE;
856
goto fallback;
857
}
858
859
#ifndef O_CLOEXEC
860
/* Set the FD_CLOEXEC flag on the directory */
861
ret = set_cloexec_flag(dir_fd);
862
if(ret < 0){
863
error(0, errno, "set_cloexec_flag");
864
exitstatus = EX_OSERR;
865
goto fallback;
866
}
867
#endif /* O_CLOEXEC */
868
}
869
870
int good_name(const struct dirent * const dirent){
871
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
872
"*.dpkg-old", "*.dpkg-bak",
873
"*.dpkg-divert", NULL };
874
#ifdef __GNUC__
875
#pragma GCC diagnostic push
876
#pragma GCC diagnostic ignored "-Wcast-qual"
877
#endif
878
for(const char **pat = (const char **)patterns;
879
*pat != NULL; pat++){
880
#ifdef __GNUC__
881
#pragma GCC diagnostic pop
882
#endif
883
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
884
!= FNM_NOMATCH){
885
if(debug){
886
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
887
" matching pattern %s\n", dirent->d_name, *pat);
888
}
889
return 0;
610
890
}
611
891
}
892
return 1;
893
}
894
895
#ifdef __GLIBC__
896
#if __GLIBC_PREREQ(2, 15)
897
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
898
alphasort);
899
#else /* not __GLIBC_PREREQ(2, 15) */
900
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
901
&direntries, good_name, alphasort);
902
#endif /* not __GLIBC_PREREQ(2, 15) */
903
#else /* not __GLIBC__ */
904
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
905
&direntries, good_name, alphasort);
906
#endif /* not __GLIBC__ */
907
if(numplugins == -1){
908
error(0, errno, "Could not scan plugin dir");
909
direntries = NULL;
910
exitstatus = EX_OSERR;
911
goto fallback;
612
912
}
613
913
614
914
FD_ZERO(&rfds_all);
615
915
616
916
/* Read and execute any executable in the plugin directory*/
617
while(true){
618
dirst = readdir(dir);
619
620
// All directory entries have been processed
621
if(dirst == NULL){
622
if (errno == EBADF){
623
perror("readdir");
624
exitstatus = EXIT_FAILURE;
625
goto fallback;
626
}
627
break;
628
}
629
630
d_name_len = strlen(dirst->d_name);
631
632
// Ignore dotfiles, backup files and other junk
633
{
634
bool bad_name = false;
635
636
const char const *bad_prefixes[] = { ".", "#", NULL };
637
638
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
639
".dpkg-old",
640
".dpkg-divert", NULL };
641
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
642
size_t pre_len = strlen(*pre);
643
if((d_name_len >= pre_len)
644
and strncmp((dirst->d_name), *pre, pre_len) == 0){
645
if(debug){
646
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
647
" with bad prefix %s\n", dirst->d_name, *pre);
648
}
649
bad_name = true;
650
break;
651
}
652
}
653
if(bad_name){
654
continue;
655
}
656
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
657
size_t suf_len = strlen(*suf);
658
if((d_name_len >= suf_len)
659
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
660
== 0)){
661
if(debug){
662
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
663
" with bad suffix %s\n", dirst->d_name, *suf);
664
}
665
bad_name = true;
666
break;
667
}
668
}
669
670
if(bad_name){
671
continue;
672
}
673
}
674
675
char *filename;
676
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
677
if(ret < 0){
678
perror("asprintf");
679
continue;
680
}
681
682
ret = stat(filename, &st);
683
if (ret == -1){
684
perror("stat");
685
free(filename);
686
continue;
687
}
688
917
for(int i = 0; i < numplugins; i++){
918
919
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
920
if(plugin_fd == -1){
921
error(0, errno, "Could not open plugin");
922
free(direntries[i]);
923
continue;
924
}
925
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
926
if(ret == -1){
927
error(0, errno, "stat");
928
TEMP_FAILURE_RETRY(close(plugin_fd));
929
free(direntries[i]);
930
continue;
931
}
932
689
933
/* Ignore non-executable files */
690
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
934
if(not S_ISREG(st.st_mode)
935
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
936
X_OK, 0)) != 0)){
691
937
if(debug){
692
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
693
" with bad type or mode\n", filename);
938
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
939
" with bad type or mode\n",
940
plugindir != NULL ? plugindir : PDIR,
941
direntries[i]->d_name);
694
942
}
695
free(filename);
943
TEMP_FAILURE_RETRY(close(plugin_fd));
944
free(direntries[i]);
696
945
continue;
697
946
}
698
947
699
plugin *p = getplugin(dirst->d_name);
948
plugin *p = getplugin(direntries[i]->d_name);
700
949
if(p == NULL){
701
perror("getplugin");
702
free(filename);
950
error(0, errno, "getplugin");
951
TEMP_FAILURE_RETRY(close(plugin_fd));
952
free(direntries[i]);
703
953
continue;
704
954
}
705
955
if(p->disabled){
706
956
if(debug){
707
957
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
708
dirst->d_name);
958
direntries[i]->d_name);
709
959
}
710
free(filename);
960
TEMP_FAILURE_RETRY(close(plugin_fd));
961
free(direntries[i]);
711
962
continue;
712
963
}
713
964
{
716
967
if(g != NULL){
717
968
for(char **a = g->argv + 1; *a != NULL; a++){
718
969
if(not add_argument(p, *a)){
719
perror("add_argument");
970
error(0, errno, "add_argument");
720
971
}
721
972
}
722
973
/* Add global environment variables */
723
974
for(char **e = g->environ; *e != NULL; e++){
724
if(not add_environment(p, *e)){
725
perror("add_environment");
975
if(not add_environment(p, *e, false)){
976
error(0, errno, "add_environment");
726
977
}
727
978
}
728
979
}
729
980
}
730
/* If this plugin has any environment variables, we will call
731
using execve and need to duplicate the environment from this
732
process, too. */
981
/* If this plugin has any environment variables, we need to
982
duplicate the environment from this process, too. */
733
983
if(p->environ[0] != NULL){
734
984
for(char **e = environ; *e != NULL; e++){
735
char *copy = strdup(*e);
736
if(copy == NULL){
737
perror("strdup");
738
continue;
739
}
740
if(not add_environment(p, copy)){
741
perror("add_environment");
985
if(not add_environment(p, *e, false)){
986
error(0, errno, "add_environment");
742
987
}
743
988
}
744
989
}
745
990
746
991
int pipefd[2];
747
ret = pipe(pipefd);
748
if (ret == -1){
749
perror("pipe");
750
exitstatus = EXIT_FAILURE;
751
goto fallback;
752
}
992
#ifndef O_CLOEXEC
993
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
994
#else /* O_CLOEXEC */
995
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
996
#endif /* O_CLOEXEC */
997
if(ret == -1){
998
error(0, errno, "pipe");
999
exitstatus = EX_OSERR;
1000
free(direntries[i]);
1001
goto fallback;
1002
}
1003
if(pipefd[0] >= FD_SETSIZE){
1004
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1005
FD_SETSIZE);
1006
TEMP_FAILURE_RETRY(close(pipefd[0]));
1007
TEMP_FAILURE_RETRY(close(pipefd[1]));
1008
exitstatus = EX_OSERR;
1009
free(direntries[i]);
1010
goto fallback;
1011
}
1012
#ifndef O_CLOEXEC
753
1013
/* Ask OS to automatic close the pipe on exec */
754
1014
ret = set_cloexec_flag(pipefd[0]);
755
1015
if(ret < 0){
756
perror("set_cloexec_flag");
757
exitstatus = EXIT_FAILURE;
1016
error(0, errno, "set_cloexec_flag");
1017
TEMP_FAILURE_RETRY(close(pipefd[0]));
1018
TEMP_FAILURE_RETRY(close(pipefd[1]));
1019
exitstatus = EX_OSERR;
1020
free(direntries[i]);
758
1021
goto fallback;
759
1022
}
760
1023
ret = set_cloexec_flag(pipefd[1]);
761
1024
if(ret < 0){
762
perror("set_cloexec_flag");
763
exitstatus = EXIT_FAILURE;
1025
error(0, errno, "set_cloexec_flag");
1026
TEMP_FAILURE_RETRY(close(pipefd[0]));
1027
TEMP_FAILURE_RETRY(close(pipefd[1]));
1028
exitstatus = EX_OSERR;
1029
free(direntries[i]);
764
1030
goto fallback;
765
1031
}
1032
#endif /* not O_CLOEXEC */
766
1033
/* Block SIGCHLD until process is safely in process list */
767
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1035
&sigchld_action.sa_mask,
1036
NULL));
768
1037
if(ret < 0){
769
perror("sigprocmask");
770
exitstatus = EXIT_FAILURE;
1038
error(0, errno, "sigprocmask");
1039
exitstatus = EX_OSERR;
1040
free(direntries[i]);
771
1041
goto fallback;
772
1042
}
773
// Starting a new process to be watched
774
pid_t pid = fork();
1043
/* Starting a new process to be watched */
1044
pid_t pid;
1045
do {
1046
pid = fork();
1047
} while(pid == -1 and errno == EINTR);
775
1048
if(pid == -1){
776
perror("fork");
777
exitstatus = EXIT_FAILURE;
1049
error(0, errno, "fork");
1050
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1051
&sigchld_action.sa_mask, NULL));
1052
TEMP_FAILURE_RETRY(close(pipefd[0]));
1053
TEMP_FAILURE_RETRY(close(pipefd[1]));
1054
exitstatus = EX_OSERR;
1055
free(direntries[i]);
778
1056
goto fallback;
779
1057
}
780
1058
if(pid == 0){
781
1059
/* this is the child process */
782
1060
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
783
1061
if(ret < 0){
784
perror("sigaction");
785
_exit(EXIT_FAILURE);
1062
error(0, errno, "sigaction");
1063
_exit(EX_OSERR);
786
1064
}
787
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1065
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
788
1066
if(ret < 0){
789
perror("sigprocmask");
790
_exit(EXIT_FAILURE);
1067
error(0, errno, "sigprocmask");
1068
_exit(EX_OSERR);
791
1069
}
792
1070
793
1071
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
794
1072
if(ret == -1){
795
perror("dup2");
796
_exit(EXIT_FAILURE);
1073
error(0, errno, "dup2");
1074
_exit(EX_OSERR);
797
1075
}
798
1076
799
if(dirfd(dir) < 0){
800
/* If dir has no file descriptor, we could not set FD_CLOEXEC
801
above and must now close it manually here. */
802
closedir(dir);
803
}
804
if(p->environ[0] == NULL){
805
if(execv(filename, p->argv) < 0){
806
perror("execv");
807
_exit(EXIT_FAILURE);
808
}
809
} else {
810
if(execve(filename, p->argv, p->environ) < 0){
811
perror("execve");
812
_exit(EXIT_FAILURE);
813
}
1077
if(fexecve(plugin_fd, p->argv,
1078
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1079
error(0, errno, "fexecve for %s/%s",
1080
plugindir != NULL ? plugindir : PDIR,
1081
direntries[i]->d_name);
1082
_exit(EX_OSERR);
814
1083
}
815
1084
/* no return */
816
1085
}
817
1086
/* Parent process */
818
close(pipefd[1]); /* Close unused write end of pipe */
819
free(filename);
820
plugin *new_plugin = getplugin(dirst->d_name);
821
if (new_plugin == NULL){
822
perror("getplugin");
823
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1087
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1088
pipe */
1089
TEMP_FAILURE_RETRY(close(plugin_fd));
1090
plugin *new_plugin = getplugin(direntries[i]->d_name);
1091
if(new_plugin == NULL){
1092
error(0, errno, "getplugin");
1093
ret = (int)(TEMP_FAILURE_RETRY
1094
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1095
NULL)));
824
1096
if(ret < 0){
825
perror("sigprocmask");
1097
error(0, errno, "sigprocmask");
826
1098
}
827
exitstatus = EXIT_FAILURE;
1099
exitstatus = EX_OSERR;
1100
free(direntries[i]);
828
1101
goto fallback;
829
1102
}
1103
free(direntries[i]);
830
1104
831
1105
new_plugin->pid = pid;
832
1106
new_plugin->fd = pipefd[0];
833
1107
834
1108
/* Unblock SIGCHLD so signal handler can be run if this process
835
1109
has already completed */
836
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1110
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1111
&sigchld_action.sa_mask,
1112
NULL));
837
1113
if(ret < 0){
838
perror("sigprocmask");
839
exitstatus = EXIT_FAILURE;
1114
error(0, errno, "sigprocmask");
1115
exitstatus = EX_OSERR;
840
1116
goto fallback;
841
1117
}
842
1118
843
FD_SET(new_plugin->fd, &rfds_all);
1119
#if defined (__GNUC__) and defined (__GLIBC__)
1120
#if not __GLIBC_PREREQ(2, 16)
1121
#pragma GCC diagnostic push
1122
#pragma GCC diagnostic ignored "-Wsign-conversion"
1123
#endif
1124
#endif
1125
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1126
-Wconversion in GNU libc
1127
before 2.16 */
1128
#if defined (__GNUC__) and defined (__GLIBC__)
1129
#if not __GLIBC_PREREQ(2, 16)
1130
#pragma GCC diagnostic pop
1131
#endif
1132
#endif
844
1133
845
if (maxfd < new_plugin->fd){
1134
if(maxfd < new_plugin->fd){
846
1135
maxfd = new_plugin->fd;
847
1136
}
848
849
1137
}
850
1138
851
closedir(dir);
852
dir = NULL;
853
1139
free(direntries);
1140
direntries = NULL;
1141
TEMP_FAILURE_RETRY(close(dir_fd));
1142
dir_fd = -1;
1143
free_plugin(getplugin(NULL));
1144
854
1145
for(plugin *p = plugin_list; p != NULL; p = p->next){
855
1146
if(p->pid != 0){
856
1147
break;
861
1152
free_plugin_list();
862
1153
}
863
1154
}
864
1155
865
1156
/* Main loop while running plugins exist */
866
1157
while(plugin_list){
867
1158
fd_set rfds = rfds_all;
868
1159
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
869
if (select_ret == -1){
870
perror("select");
871
exitstatus = EXIT_FAILURE;
1160
if(select_ret == -1 and errno != EINTR){
1161
error(0, errno, "select");
1162
exitstatus = EX_OSERR;
872
1163
goto fallback;
873
1164
}
874
1165
/* OK, now either a process completed, or something can be read
875
1166
from one of them */
876
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1167
for(plugin *proc = plugin_list; proc != NULL;){
877
1168
/* Is this process completely done? */
878
if(proc->eof and proc->completed){
1169
if(proc->completed and proc->eof){
879
1170
/* Only accept the plugin output if it exited cleanly */
880
1171
if(not WIFEXITED(proc->status)
881
1172
or WEXITSTATUS(proc->status) != 0){
882
1173
/* Bad exit by plugin */
883
1174
884
1175
if(debug){
885
1176
if(WIFEXITED(proc->status)){
886
fprintf(stderr, "Plugin %u exited with status %d\n",
887
(unsigned int) (proc->pid),
1177
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1178
" status %d\n", proc->name,
1179
(intmax_t) (proc->pid),
888
1180
WEXITSTATUS(proc->status));
889
} else if(WIFSIGNALED(proc->status)) {
890
fprintf(stderr, "Plugin %u killed by signal %d\n",
891
(unsigned int) (proc->pid),
892
WTERMSIG(proc->status));
1181
} else if(WIFSIGNALED(proc->status)){
1182
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1183
" signal %d: %s\n", proc->name,
1184
(intmax_t) (proc->pid),
1185
WTERMSIG(proc->status),
1186
strsignal(WTERMSIG(proc->status)));
893
1187
} else if(WCOREDUMP(proc->status)){
894
fprintf(stderr, "Plugin %d dumped core\n",
895
(unsigned int) (proc->pid));
1188
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1189
" core\n", proc->name, (intmax_t) (proc->pid));
896
1190
}
897
1191
}
898
1192
899
1193
/* Remove the plugin */
900
FD_CLR(proc->fd, &rfds_all);
901
1194
#if defined (__GNUC__) and defined (__GLIBC__)
1195
#if not __GLIBC_PREREQ(2, 16)
1196
#pragma GCC diagnostic push
1197
#pragma GCC diagnostic ignored "-Wsign-conversion"
1198
#endif
1199
#endif
1200
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1201
-Wconversion in GNU libc
1202
before 2.16 */
1203
#if defined (__GNUC__) and defined (__GLIBC__)
1204
#if not __GLIBC_PREREQ(2, 16)
1205
#pragma GCC diagnostic pop
1206
#endif
1207
#endif
1208
902
1209
/* Block signal while modifying process_list */
903
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1210
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1211
(SIG_BLOCK,
1212
&sigchld_action.sa_mask,
1213
NULL));
904
1214
if(ret < 0){
905
perror("sigprocmask");
906
exitstatus = EXIT_FAILURE;
1215
error(0, errno, "sigprocmask");
1216
exitstatus = EX_OSERR;
907
1217
goto fallback;
908
1218
}
1219
1220
plugin *next_plugin = proc->next;
909
1221
free_plugin(proc);
1222
proc = next_plugin;
1223
910
1224
/* We are done modifying process list, so unblock signal */
911
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
912
NULL);
1225
ret = (int)(TEMP_FAILURE_RETRY
1226
(sigprocmask(SIG_UNBLOCK,
1227
&sigchld_action.sa_mask, NULL)));
913
1228
if(ret < 0){
914
perror("sigprocmask");
915
exitstatus = EXIT_FAILURE;
1229
error(0, errno, "sigprocmask");
1230
exitstatus = EX_OSERR;
916
1231
goto fallback;
917
1232
}
918
1233
919
1234
if(plugin_list == NULL){
920
1235
break;
921
1236
}
1237
922
1238
continue;
923
1239
}
924
1240
925
1241
/* This process exited nicely, so print its buffer */
926
1242
927
1243
bool bret = print_out_password(proc->buffer,
928
1244
proc->buffer_length);
929
1245
if(not bret){
930
perror("print_out_password");
931
exitstatus = EXIT_FAILURE;
1246
error(0, errno, "print_out_password");
1247
exitstatus = EX_IOERR;
932
1248
}
933
1249
goto fallback;
934
1250
}
935
1251
936
1252
/* This process has not completed. Does it have any output? */
937
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1253
#if defined (__GNUC__) and defined (__GLIBC__)
1254
#if not __GLIBC_PREREQ(2, 16)
1255
#pragma GCC diagnostic push
1256
#pragma GCC diagnostic ignored "-Wsign-conversion"
1257
#endif
1258
#endif
1259
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1260
warning from
1261
-Wconversion
1262
in GNU libc
1263
before
1264
2.16 */
1265
#if defined (__GNUC__) and defined (__GLIBC__)
1266
#if not __GLIBC_PREREQ(2, 16)
1267
#pragma GCC diagnostic pop
1268
#endif
1269
#endif
938
1270
/* This process had nothing to say at this time */
1271
proc = proc->next;
939
1272
continue;
940
1273
}
941
1274
/* Before reading, make the process' data buffer large enough */
942
1275
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
943
proc->buffer = realloc(proc->buffer, proc->buffer_size
944
+ (size_t) BUFFER_SIZE);
945
if (proc->buffer == NULL){
946
perror("malloc");
947
exitstatus = EXIT_FAILURE;
1276
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1277
+ (size_t) BUFFER_SIZE);
1278
if(new_buffer == NULL){
1279
error(0, errno, "malloc");
1280
exitstatus = EX_OSERR;
948
1281
goto fallback;
949
1282
}
1283
proc->buffer = new_buffer;
950
1284
proc->buffer_size += BUFFER_SIZE;
951
1285
}
952
1286
/* Read from the process */
953
ret = read(proc->fd, proc->buffer + proc->buffer_length,
954
BUFFER_SIZE);
955
if(ret < 0){
1287
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1288
proc->buffer
1289
+ proc->buffer_length,
1290
BUFFER_SIZE));
1291
if(sret < 0){
956
1292
/* Read error from this process; ignore the error */
1293
proc = proc->next;
957
1294
continue;
958
1295
}
959
if(ret == 0){
1296
if(sret == 0){
960
1297
/* got EOF */
961
1298
proc->eof = true;
962
1299
} else {
963
proc->buffer_length += (size_t) ret;
1300
proc->buffer_length += (size_t) sret;
964
1301
}
965
1302
}
966
1303
}
967
968
1304
1305
969
1306
fallback:
970
1307
971
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1308
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1309
and exitstatus != EX_OK)){
972
1310
/* Fallback if all plugins failed, none are found or an error
973
1311
occured */
974
1312
bool bret;
975
1313
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
976
1314
char *passwordbuffer = getpass("Password: ");
977
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1315
size_t len = strlen(passwordbuffer);
1316
/* Strip trailing newline */
1317
if(len > 0 and passwordbuffer[len-1] == '\n'){
1318
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1319
len--;
1320
}
1321
bret = print_out_password(passwordbuffer, len);
978
1322
if(not bret){
979
perror("print_out_password");
980
exitstatus = EXIT_FAILURE;
1323
error(0, errno, "print_out_password");
1324
exitstatus = EX_IOERR;
981
1325
}
982
1326
}
983
1327
984
1328
/* Restore old signal handler */
985
1329
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
986
1330
if(ret == -1){
987
perror("sigaction");
988
exitstatus = EXIT_FAILURE;
1331
error(0, errno, "sigaction");
1332
exitstatus = EX_OSERR;
989
1333
}
990
1334
991
1335
if(custom_argv != NULL){
992
1336
for(char **arg = custom_argv+1; *arg != NULL; arg++){
993
1337
free(*arg);
995
1339
free(custom_argv);
996
1340
}
997
1341
998
if(dir != NULL){
999
closedir(dir);
1342
free(direntries);
1343
1344
if(dir_fd != -1){
1345
TEMP_FAILURE_RETRY(close(dir_fd));
1000
1346
}
1001
1347
1002
/* Free the process list and kill the processes */
1348
/* Kill the processes */
1003
1349
for(plugin *p = plugin_list; p != NULL; p = p->next){
1004
1350
if(p->pid != 0){
1005
1351
close(p->fd);
1006
1352
ret = kill(p->pid, SIGTERM);
1007
1353
if(ret == -1 and errno != ESRCH){
1008
1354
/* Set-uid proccesses might not get closed */
1009
perror("kill");
1355
error(0, errno, "kill");
1010
1356
}
1011
1357
}
1012
1358
}
1013
1359
1014
1360
/* Wait for any remaining child processes to terminate */
1015
do{
1361
do {
1016
1362
ret = wait(NULL);
1017
1363
} while(ret >= 0);
1018
1364
if(errno != ECHILD){
1019
perror("wait");
1365
error(0, errno, "wait");
1020
1366
}
1021
1367
1022
1368
free_plugin_list();
1023
1369
1024
1370
free(plugindir);
1371
free(pluginhelperdir);
1025
1372
free(argfile);
1026
1373
1027
1374
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0