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- Committer: Teddy Hogeborn
- Date: 2016-03-17 20:40:55 UTC
- Revision ID: teddy@recompile.se-20160317204055-bhsh5xsidq7w5cxu
Client: Fix plymouth agent; broken since 1.7.2.
Fix an very old memory bug in the plymouth agent (which has been
present since its apperance in version 1.2), but which was only
recently detected at run time due to the new -fsanitize=address
compile- time flag, which has been used since version 1.7.2. This
detection of a memory access violation causes the program to abort,
making the Plymouth graphical boot system unable to accept interactive
input of passwords when using the Mandos client.
* plugins.d/plymouth.c (exec_and_wait): Fix memory allocation bug when
allocating new_argv. Also tolerate a zero-length argv.
Fix an very old memory bug in the plymouth agent (which has been
present since its apperance in version 1.2), but which was only
recently detected at run time due to the new -fsanitize=address
compile- time flag, which has been used since version 1.7.2. This
detection of a memory access violation causes the program to abort,
making the Plymouth graphical boot system unable to accept interactive
input of passwords when using the Mandos client.
* plugins.d/plymouth.c (exec_and_wait): Fix memory allocation bug when
allocating new_argv. Also tolerate a zero-length argv.
- 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
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))
360
struct argp_state *state) {
361
/* Get the INPUT argument from `argp_parse', which we know is a
362
pointer to our plugin list pointer. */
363
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;
364
441
case 'g': /* --global-options */
365
if (arg != NULL){
366
char *p;
367
while((p = strsep(&arg, ",")) != NULL){
368
if(p[0] == '\0'){
369
continue;
370
}
371
if(not add_argument(getplugin(NULL), p)){
372
perror("add_argument");
373
return ARGP_ERR_UNKNOWN;
374
}
375
}
376
}
377
break;
378
case 'e': /* --global-envs */
379
if(arg == NULL){
380
break;
381
}
382
442
{
383
char *envdef = strdup(arg);
384
if(envdef == NULL){
385
break;
386
}
387
if(not add_environment(getplugin(NULL), envdef)){
388
perror("add_environment");
389
}
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;
390
455
}
391
456
break;
392
457
case 'o': /* --options-for */
393
if (arg != NULL){
394
char *p_name = strsep(&arg, ":");
395
if(p_name[0] == '\0'){
396
break;
397
}
398
char *opt = strsep(&arg, ":");
399
if(opt[0] == '\0'){
400
break;
401
}
402
if(opt != NULL){
403
char *p;
404
while((p = strsep(&opt, ",")) != NULL){
405
if(p[0] == '\0'){
406
continue;
407
}
408
if(not add_argument(getplugin(p_name), p)){
409
perror("add_argument");
410
return ARGP_ERR_UNKNOWN;
411
}
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;
412
476
}
413
477
}
478
errno = 0;
414
479
}
415
480
break;
416
case 'f': /* --envs-for */
417
if(arg == NULL){
418
break;
419
}
481
case 'E': /* --env-for */
420
482
{
421
483
char *envdef = strchr(arg, ':');
422
484
if(envdef == NULL){
423
break;
424
}
425
char *p_name = strndup(arg, (size_t) (envdef-arg));
426
if(p_name == NULL){
427
break;
428
}
485
argp_error(state, "No colon in \"%s\"", arg);
486
errno = EINVAL;
487
break;
488
}
489
*envdef = '\0';
429
490
envdef++;
430
if(not add_environment(getplugin(p_name), envdef)){
431
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;
432
498
}
433
499
}
434
500
break;
435
501
case 'd': /* --disable */
436
if (arg != NULL){
437
plugin *p = getplugin(arg);
438
if(p == NULL){
439
return ARGP_ERR_UNKNOWN;
440
}
441
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
}
442
517
}
443
518
break;
444
519
case 128: /* --plugin-dir */
520
free(plugindir);
445
521
plugindir = strdup(arg);
446
if(plugindir == NULL){
447
perror("strdup");
448
}
449
break;
450
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);
451
609
argfile = strdup(arg);
452
if(argfile == NULL){
453
perror("strdup");
610
if(argfile != NULL){
611
errno = 0;
454
612
}
455
break;
613
break;
456
614
case 130: /* --userid */
457
uid = (uid_t)strtol(arg, NULL, 10);
458
break;
459
615
case 131: /* --groupid */
460
gid = (gid_t)strtol(arg, NULL, 10);
461
break;
462
616
case 132: /* --debug */
463
debug = true;
464
break;
617
case 133: /* --plugin-helper-dir */
618
case '?': /* --help */
619
case -3: /* --usage */
620
case 'V': /* --version */
465
621
case ARGP_KEY_ARG:
466
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
467
break;
468
case ARGP_KEY_END:
469
622
break;
470
623
default:
471
624
return ARGP_ERR_UNKNOWN;
472
625
}
473
return 0;
626
return errno;
474
627
}
475
628
476
struct argp argp = { .options = options, .parser = parse_opt,
477
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
629
struct argp argp = { .options = options,
630
.parser = parse_opt_config_file,
631
.args_doc = "",
478
632
.doc = "Mandos plugin runner -- Run plugins" };
479
633
480
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
481
if (ret == ARGP_ERR_UNKNOWN){
482
fprintf(stderr, "Unknown error while parsing arguments\n");
483
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;
484
650
goto fallback;
485
651
}
486
487
/* Opens the configfile if aviable */
488
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){
489
658
conffp = fopen(AFILE, "r");
490
659
} else {
491
660
conffp = fopen(argfile, "r");
492
}
661
}
493
662
if(conffp != NULL){
494
663
char *org_line = NULL;
495
664
char *p, *arg, *new_arg, *line;
496
665
size_t size = 0;
497
ssize_t sret;
498
666
const char whitespace_delims[] = " \r\t\f\v\n";
499
667
const char comment_delim[] = "#";
500
668
501
669
custom_argc = 1;
502
670
custom_argv = malloc(sizeof(char*) * 2);
503
671
if(custom_argv == NULL){
504
perror("malloc");
505
exitstatus = EXIT_FAILURE;
672
error(0, errno, "malloc");
673
exitstatus = EX_OSERR;
506
674
goto fallback;
507
675
}
508
676
custom_argv[0] = argv[0];
509
677
custom_argv[1] = NULL;
510
678
511
679
/* for each line in the config file, strip whitespace and ignore
512
680
commented text */
513
681
while(true){
515
683
if(sret == -1){
516
684
break;
517
685
}
518
686
519
687
line = org_line;
520
688
arg = strsep(&line, comment_delim);
521
689
while((p = strsep(&arg, whitespace_delims)) != NULL){
524
692
}
525
693
new_arg = strdup(p);
526
694
if(new_arg == NULL){
527
perror("strdup");
528
exitstatus = EXIT_FAILURE;
695
error(0, errno, "strdup");
696
exitstatus = EX_OSERR;
529
697
free(org_line);
530
698
goto fallback;
531
699
}
532
700
533
701
custom_argc += 1;
534
custom_argv = realloc(custom_argv, sizeof(char *)
535
* ((unsigned int) custom_argc + 1));
536
if(custom_argv == NULL){
537
perror("realloc");
538
exitstatus = EXIT_FAILURE;
539
free(org_line);
540
goto fallback;
702
{
703
char **new_argv = realloc(custom_argv, sizeof(char *)
704
* ((size_t)custom_argc + 1));
705
if(new_argv == NULL){
706
error(0, errno, "realloc");
707
exitstatus = EX_OSERR;
708
free(new_arg);
709
free(org_line);
710
goto fallback;
711
} else {
712
custom_argv = new_argv;
713
}
541
714
}
542
715
custom_argv[custom_argc-1] = new_arg;
543
custom_argv[custom_argc] = NULL;
716
custom_argv[custom_argc] = NULL;
544
717
}
545
718
}
719
do {
720
ret = fclose(conffp);
721
} while(ret == EOF and errno == EINTR);
722
if(ret == EOF){
723
error(0, errno, "fclose");
724
exitstatus = EX_IOERR;
725
goto fallback;
726
}
546
727
free(org_line);
547
} else{
728
} else {
548
729
/* Check for harmful errors and go to fallback. Other errors might
549
730
not affect opening plugins */
550
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
551
perror("fopen");
552
exitstatus = EXIT_FAILURE;
731
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
732
error(0, errno, "fopen");
733
exitstatus = EX_OSERR;
553
734
goto fallback;
554
735
}
555
736
}
556
/* If there was any arguments from configuration file,
557
pass them to parser as command arguments */
737
/* If there were any arguments from the configuration file, pass
738
them to parser as command line arguments */
558
739
if(custom_argv != NULL){
559
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
560
if (ret == ARGP_ERR_UNKNOWN){
561
fprintf(stderr, "Unknown error while parsing arguments\n");
562
exitstatus = EXIT_FAILURE;
563
goto fallback;
740
ret = argp_parse(&argp, custom_argc, custom_argv,
741
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
742
NULL, NULL);
743
switch(ret){
744
case 0:
745
break;
746
case ENOMEM:
747
default:
748
errno = ret;
749
error(0, errno, "argp_parse");
750
exitstatus = EX_OSERR;
751
goto fallback;
752
case EINVAL:
753
exitstatus = EX_CONFIG;
754
goto fallback;
755
}
756
}
757
758
/* Parse actual command line arguments, to let them override the
759
config file */
760
ret = argp_parse(&argp, argc, argv,
761
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
762
NULL, NULL);
763
switch(ret){
764
case 0:
765
break;
766
case ENOMEM:
767
default:
768
errno = ret;
769
error(0, errno, "argp_parse");
770
exitstatus = EX_OSERR;
771
goto fallback;
772
case EINVAL:
773
exitstatus = EX_USAGE;
774
goto fallback;
775
}
776
777
{
778
char *pluginhelperenv;
779
bool bret = true;
780
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
781
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
782
if(ret != -1){
783
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
784
}
785
if(ret == -1 or not bret){
786
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
787
" environment variable to \"%s\" for all plugins\n",
788
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
789
}
790
if(ret != -1){
791
free(pluginhelperenv);
564
792
}
565
793
}
566
794
571
799
for(char **a = p->argv; *a != NULL; a++){
572
800
fprintf(stderr, "\tArg: %s\n", *a);
573
801
}
574
fprintf(stderr, "...and %u environment variables\n", p->envc);
802
fprintf(stderr, "...and %d environment variables\n", p->envc);
575
803
for(char **a = p->environ; *a != NULL; a++){
576
804
fprintf(stderr, "\t%s\n", *a);
577
805
}
578
806
}
579
807
}
580
581
/* Strip permissions down to nobody */
808
809
if(getuid() == 0){
810
/* Work around Debian bug #633582:
811
<http://bugs.debian.org/633582> */
812
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
813
if(plugindir_fd == -1){
814
if(errno != ENOENT){
815
error(0, errno, "open(\"" PDIR "\")");
816
}
817
} else {
818
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
819
if(ret == -1){
820
error(0, errno, "fstat");
821
} else {
822
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
823
ret = fchown(plugindir_fd, uid, gid);
824
if(ret == -1){
825
error(0, errno, "fchown");
826
}
827
}
828
}
829
close(plugindir_fd);
830
}
831
}
832
833
/* Lower permissions */
834
ret = setgid(gid);
835
if(ret == -1){
836
error(0, errno, "setgid");
837
}
582
838
ret = setuid(uid);
583
if (ret == -1){
584
perror("setuid");
585
}
586
setgid(gid);
587
if (ret == -1){
588
perror("setgid");
589
}
590
591
if (plugindir == NULL){
592
dir = opendir(PDIR);
593
} else {
594
dir = opendir(plugindir);
595
}
596
597
if(dir == NULL){
598
perror("Could not open plugin dir");
599
exitstatus = EXIT_FAILURE;
600
goto fallback;
601
}
602
603
/* Set the FD_CLOEXEC flag on the directory, if possible */
839
if(ret == -1){
840
error(0, errno, "setuid");
841
}
842
843
/* Open plugin directory with close_on_exec flag */
604
844
{
605
int dir_fd = dirfd(dir);
606
if(dir_fd >= 0){
607
ret = set_cloexec_flag(dir_fd);
608
if(ret < 0){
609
perror("set_cloexec_flag");
610
exitstatus = EXIT_FAILURE;
611
goto fallback;
845
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
846
#ifdef O_CLOEXEC
847
O_CLOEXEC
848
#else /* not O_CLOEXEC */
849
0
850
#endif /* not O_CLOEXEC */
851
);
852
if(dir_fd == -1){
853
error(0, errno, "Could not open plugin dir");
854
exitstatus = EX_UNAVAILABLE;
855
goto fallback;
856
}
857
858
#ifndef O_CLOEXEC
859
/* Set the FD_CLOEXEC flag on the directory */
860
ret = set_cloexec_flag(dir_fd);
861
if(ret < 0){
862
error(0, errno, "set_cloexec_flag");
863
exitstatus = EX_OSERR;
864
goto fallback;
865
}
866
#endif /* O_CLOEXEC */
867
}
868
869
int good_name(const struct dirent * const dirent){
870
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
871
"*.dpkg-old", "*.dpkg-bak",
872
"*.dpkg-divert", NULL };
873
#ifdef __GNUC__
874
#pragma GCC diagnostic push
875
#pragma GCC diagnostic ignored "-Wcast-qual"
876
#endif
877
for(const char **pat = (const char **)patterns;
878
*pat != NULL; pat++){
879
#ifdef __GNUC__
880
#pragma GCC diagnostic pop
881
#endif
882
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
883
!= FNM_NOMATCH){
884
if(debug){
885
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
886
" matching pattern %s\n", dirent->d_name, *pat);
887
}
888
return 0;
612
889
}
613
890
}
891
return 1;
892
}
893
894
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
895
alphasort);
896
if(numplugins == -1){
897
error(0, errno, "Could not scan plugin dir");
898
direntries = NULL;
899
exitstatus = EX_OSERR;
900
goto fallback;
614
901
}
615
902
616
903
FD_ZERO(&rfds_all);
617
904
618
905
/* Read and execute any executable in the plugin directory*/
619
while(true){
620
dirst = readdir(dir);
621
622
// All directory entries have been processed
623
if(dirst == NULL){
624
if (errno == EBADF){
625
perror("readdir");
626
exitstatus = EXIT_FAILURE;
627
goto fallback;
628
}
629
break;
630
}
631
632
d_name_len = strlen(dirst->d_name);
633
634
// Ignore dotfiles, backup files and other junk
635
{
636
bool bad_name = false;
637
638
const char const *bad_prefixes[] = { ".", "#", NULL };
639
640
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
641
".dpkg-old",
642
".dpkg-divert", NULL };
643
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
644
size_t pre_len = strlen(*pre);
645
if((d_name_len >= pre_len)
646
and strncmp((dirst->d_name), *pre, pre_len) == 0){
647
if(debug){
648
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
649
" with bad prefix %s\n", dirst->d_name, *pre);
650
}
651
bad_name = true;
652
break;
653
}
654
}
655
if(bad_name){
656
continue;
657
}
658
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
659
size_t suf_len = strlen(*suf);
660
if((d_name_len >= suf_len)
661
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
662
== 0)){
663
if(debug){
664
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
665
" with bad suffix %s\n", dirst->d_name, *suf);
666
}
667
bad_name = true;
668
break;
669
}
670
}
671
672
if(bad_name){
673
continue;
674
}
675
}
676
677
char *filename;
678
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
679
if(ret < 0){
680
perror("asprintf");
681
continue;
682
}
683
684
ret = stat(filename, &st);
685
if (ret == -1){
686
perror("stat");
687
free(filename);
688
continue;
689
}
690
906
for(int i = 0; i < numplugins; i++){
907
908
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
909
if(plugin_fd == -1){
910
error(0, errno, "Could not open plugin");
911
free(direntries[i]);
912
continue;
913
}
914
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
915
if(ret == -1){
916
error(0, errno, "stat");
917
close(plugin_fd);
918
free(direntries[i]);
919
continue;
920
}
921
691
922
/* Ignore non-executable files */
692
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
923
if(not S_ISREG(st.st_mode)
924
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
925
X_OK, 0)) != 0)){
693
926
if(debug){
694
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
695
" with bad type or mode\n", filename);
927
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
928
" with bad type or mode\n",
929
plugindir != NULL ? plugindir : PDIR,
930
direntries[i]->d_name);
696
931
}
697
free(filename);
932
close(plugin_fd);
933
free(direntries[i]);
698
934
continue;
699
935
}
700
936
701
plugin *p = getplugin(dirst->d_name);
937
plugin *p = getplugin(direntries[i]->d_name);
702
938
if(p == NULL){
703
perror("getplugin");
704
free(filename);
939
error(0, errno, "getplugin");
940
close(plugin_fd);
941
free(direntries[i]);
705
942
continue;
706
943
}
707
944
if(p->disabled){
708
945
if(debug){
709
946
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
710
dirst->d_name);
947
direntries[i]->d_name);
711
948
}
712
free(filename);
949
close(plugin_fd);
950
free(direntries[i]);
713
951
continue;
714
952
}
715
953
{
718
956
if(g != NULL){
719
957
for(char **a = g->argv + 1; *a != NULL; a++){
720
958
if(not add_argument(p, *a)){
721
perror("add_argument");
959
error(0, errno, "add_argument");
722
960
}
723
961
}
724
962
/* Add global environment variables */
725
963
for(char **e = g->environ; *e != NULL; e++){
726
if(not add_environment(p, *e)){
727
perror("add_environment");
964
if(not add_environment(p, *e, false)){
965
error(0, errno, "add_environment");
728
966
}
729
967
}
730
968
}
731
969
}
732
/* If this plugin has any environment variables, we will call
733
using execve and need to duplicate the environment from this
734
process, too. */
970
/* If this plugin has any environment variables, we need to
971
duplicate the environment from this process, too. */
735
972
if(p->environ[0] != NULL){
736
973
for(char **e = environ; *e != NULL; e++){
737
char *copy = strdup(*e);
738
if(copy == NULL){
739
perror("strdup");
740
continue;
741
}
742
if(not add_environment(p, copy)){
743
perror("add_environment");
974
if(not add_environment(p, *e, false)){
975
error(0, errno, "add_environment");
744
976
}
745
977
}
746
978
}
747
979
748
980
int pipefd[2];
749
ret = pipe(pipefd);
750
if (ret == -1){
751
perror("pipe");
752
exitstatus = EXIT_FAILURE;
753
goto fallback;
754
}
981
#ifndef O_CLOEXEC
982
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
983
#else /* O_CLOEXEC */
984
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
985
#endif /* O_CLOEXEC */
986
if(ret == -1){
987
error(0, errno, "pipe");
988
exitstatus = EX_OSERR;
989
free(direntries[i]);
990
goto fallback;
991
}
992
if(pipefd[0] >= FD_SETSIZE){
993
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
994
FD_SETSIZE);
995
close(pipefd[0]);
996
close(pipefd[1]);
997
exitstatus = EX_OSERR;
998
free(direntries[i]);
999
goto fallback;
1000
}
1001
#ifndef O_CLOEXEC
755
1002
/* Ask OS to automatic close the pipe on exec */
756
1003
ret = set_cloexec_flag(pipefd[0]);
757
1004
if(ret < 0){
758
perror("set_cloexec_flag");
759
exitstatus = EXIT_FAILURE;
1005
error(0, errno, "set_cloexec_flag");
1006
close(pipefd[0]);
1007
close(pipefd[1]);
1008
exitstatus = EX_OSERR;
1009
free(direntries[i]);
760
1010
goto fallback;
761
1011
}
762
1012
ret = set_cloexec_flag(pipefd[1]);
763
1013
if(ret < 0){
764
perror("set_cloexec_flag");
765
exitstatus = EXIT_FAILURE;
1014
error(0, errno, "set_cloexec_flag");
1015
close(pipefd[0]);
1016
close(pipefd[1]);
1017
exitstatus = EX_OSERR;
1018
free(direntries[i]);
766
1019
goto fallback;
767
1020
}
1021
#endif /* not O_CLOEXEC */
768
1022
/* Block SIGCHLD until process is safely in process list */
769
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1023
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1024
&sigchld_action.sa_mask,
1025
NULL));
770
1026
if(ret < 0){
771
perror("sigprocmask");
772
exitstatus = EXIT_FAILURE;
1027
error(0, errno, "sigprocmask");
1028
exitstatus = EX_OSERR;
1029
free(direntries[i]);
773
1030
goto fallback;
774
1031
}
775
// Starting a new process to be watched
776
pid_t pid = fork();
1032
/* Starting a new process to be watched */
1033
pid_t pid;
1034
do {
1035
pid = fork();
1036
} while(pid == -1 and errno == EINTR);
777
1037
if(pid == -1){
778
perror("fork");
779
exitstatus = EXIT_FAILURE;
1038
error(0, errno, "fork");
1039
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1040
&sigchld_action.sa_mask, NULL));
1041
close(pipefd[0]);
1042
close(pipefd[1]);
1043
exitstatus = EX_OSERR;
1044
free(direntries[i]);
780
1045
goto fallback;
781
1046
}
782
1047
if(pid == 0){
783
1048
/* this is the child process */
784
1049
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
785
1050
if(ret < 0){
786
perror("sigaction");
787
_exit(EXIT_FAILURE);
1051
error(0, errno, "sigaction");
1052
_exit(EX_OSERR);
788
1053
}
789
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1054
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
790
1055
if(ret < 0){
791
perror("sigprocmask");
792
_exit(EXIT_FAILURE);
1056
error(0, errno, "sigprocmask");
1057
_exit(EX_OSERR);
793
1058
}
794
1059
795
1060
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
796
1061
if(ret == -1){
797
perror("dup2");
798
_exit(EXIT_FAILURE);
1062
error(0, errno, "dup2");
1063
_exit(EX_OSERR);
799
1064
}
800
1065
801
if(dirfd(dir) < 0){
802
/* If dir has no file descriptor, we could not set FD_CLOEXEC
803
above and must now close it manually here. */
804
closedir(dir);
805
}
806
if(p->environ[0] == NULL){
807
if(execv(filename, p->argv) < 0){
808
perror("execv");
809
_exit(EXIT_FAILURE);
810
}
811
} else {
812
if(execve(filename, p->argv, p->environ) < 0){
813
perror("execve");
814
_exit(EXIT_FAILURE);
815
}
1066
if(fexecve(plugin_fd, p->argv,
1067
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1068
error(0, errno, "fexecve for %s/%s",
1069
plugindir != NULL ? plugindir : PDIR,
1070
direntries[i]->d_name);
1071
_exit(EX_OSERR);
816
1072
}
817
1073
/* no return */
818
1074
}
819
1075
/* Parent process */
820
1076
close(pipefd[1]); /* Close unused write end of pipe */
821
free(filename);
822
plugin *new_plugin = getplugin(dirst->d_name);
823
if (new_plugin == NULL){
824
perror("getplugin");
825
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1077
close(plugin_fd);
1078
plugin *new_plugin = getplugin(direntries[i]->d_name);
1079
if(new_plugin == NULL){
1080
error(0, errno, "getplugin");
1081
ret = (int)(TEMP_FAILURE_RETRY
1082
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1083
NULL)));
826
1084
if(ret < 0){
827
perror("sigprocmask");
1085
error(0, errno, "sigprocmask");
828
1086
}
829
exitstatus = EXIT_FAILURE;
1087
exitstatus = EX_OSERR;
1088
free(direntries[i]);
830
1089
goto fallback;
831
1090
}
1091
free(direntries[i]);
832
1092
833
1093
new_plugin->pid = pid;
834
1094
new_plugin->fd = pipefd[0];
835
1095
836
1096
/* Unblock SIGCHLD so signal handler can be run if this process
837
1097
has already completed */
838
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1098
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1099
&sigchld_action.sa_mask,
1100
NULL));
839
1101
if(ret < 0){
840
perror("sigprocmask");
841
exitstatus = EXIT_FAILURE;
1102
error(0, errno, "sigprocmask");
1103
exitstatus = EX_OSERR;
842
1104
goto fallback;
843
1105
}
844
1106
845
1107
FD_SET(new_plugin->fd, &rfds_all);
846
1108
847
if (maxfd < new_plugin->fd){
1109
if(maxfd < new_plugin->fd){
848
1110
maxfd = new_plugin->fd;
849
1111
}
850
851
1112
}
852
1113
853
closedir(dir);
854
dir = NULL;
855
1114
free(direntries);
1115
direntries = NULL;
1116
close(dir_fd);
1117
dir_fd = -1;
1118
free_plugin(getplugin(NULL));
1119
856
1120
for(plugin *p = plugin_list; p != NULL; p = p->next){
857
1121
if(p->pid != 0){
858
1122
break;
863
1127
free_plugin_list();
864
1128
}
865
1129
}
866
1130
867
1131
/* Main loop while running plugins exist */
868
1132
while(plugin_list){
869
1133
fd_set rfds = rfds_all;
870
1134
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
871
if (select_ret == -1){
872
perror("select");
873
exitstatus = EXIT_FAILURE;
1135
if(select_ret == -1 and errno != EINTR){
1136
error(0, errno, "select");
1137
exitstatus = EX_OSERR;
874
1138
goto fallback;
875
1139
}
876
1140
/* OK, now either a process completed, or something can be read
877
1141
from one of them */
878
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1142
for(plugin *proc = plugin_list; proc != NULL;){
879
1143
/* Is this process completely done? */
880
if(proc->eof and proc->completed){
1144
if(proc->completed and proc->eof){
881
1145
/* Only accept the plugin output if it exited cleanly */
882
1146
if(not WIFEXITED(proc->status)
883
1147
or WEXITSTATUS(proc->status) != 0){
884
1148
/* Bad exit by plugin */
885
1149
886
1150
if(debug){
887
1151
if(WIFEXITED(proc->status)){
888
fprintf(stderr, "Plugin %u exited with status %d\n",
889
(unsigned int) (proc->pid),
1152
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1153
" status %d\n", proc->name,
1154
(intmax_t) (proc->pid),
890
1155
WEXITSTATUS(proc->status));
891
} else if(WIFSIGNALED(proc->status)) {
892
fprintf(stderr, "Plugin %u killed by signal %d\n",
893
(unsigned int) (proc->pid),
894
WTERMSIG(proc->status));
1156
} else if(WIFSIGNALED(proc->status)){
1157
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1158
" signal %d: %s\n", proc->name,
1159
(intmax_t) (proc->pid),
1160
WTERMSIG(proc->status),
1161
strsignal(WTERMSIG(proc->status)));
895
1162
} else if(WCOREDUMP(proc->status)){
896
fprintf(stderr, "Plugin %d dumped core\n",
897
(unsigned int) (proc->pid));
1163
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1164
" core\n", proc->name, (intmax_t) (proc->pid));
898
1165
}
899
1166
}
900
1167
901
1168
/* Remove the plugin */
902
1169
FD_CLR(proc->fd, &rfds_all);
903
1170
904
1171
/* Block signal while modifying process_list */
905
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1172
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1173
(SIG_BLOCK,
1174
&sigchld_action.sa_mask,
1175
NULL));
906
1176
if(ret < 0){
907
perror("sigprocmask");
908
exitstatus = EXIT_FAILURE;
1177
error(0, errno, "sigprocmask");
1178
exitstatus = EX_OSERR;
909
1179
goto fallback;
910
1180
}
1181
1182
plugin *next_plugin = proc->next;
911
1183
free_plugin(proc);
1184
proc = next_plugin;
1185
912
1186
/* We are done modifying process list, so unblock signal */
913
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
914
NULL);
1187
ret = (int)(TEMP_FAILURE_RETRY
1188
(sigprocmask(SIG_UNBLOCK,
1189
&sigchld_action.sa_mask, NULL)));
915
1190
if(ret < 0){
916
perror("sigprocmask");
917
exitstatus = EXIT_FAILURE;
1191
error(0, errno, "sigprocmask");
1192
exitstatus = EX_OSERR;
918
1193
goto fallback;
919
1194
}
920
1195
921
1196
if(plugin_list == NULL){
922
1197
break;
923
1198
}
1199
924
1200
continue;
925
1201
}
926
1202
927
1203
/* This process exited nicely, so print its buffer */
928
1204
929
1205
bool bret = print_out_password(proc->buffer,
930
1206
proc->buffer_length);
931
1207
if(not bret){
932
perror("print_out_password");
933
exitstatus = EXIT_FAILURE;
1208
error(0, errno, "print_out_password");
1209
exitstatus = EX_IOERR;
934
1210
}
935
1211
goto fallback;
936
1212
}
938
1214
/* This process has not completed. Does it have any output? */
939
1215
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
940
1216
/* This process had nothing to say at this time */
1217
proc = proc->next;
941
1218
continue;
942
1219
}
943
1220
/* Before reading, make the process' data buffer large enough */
944
1221
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
945
proc->buffer = realloc(proc->buffer, proc->buffer_size
946
+ (size_t) BUFFER_SIZE);
947
if (proc->buffer == NULL){
948
perror("malloc");
949
exitstatus = EXIT_FAILURE;
1222
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1223
+ (size_t) BUFFER_SIZE);
1224
if(new_buffer == NULL){
1225
error(0, errno, "malloc");
1226
exitstatus = EX_OSERR;
950
1227
goto fallback;
951
1228
}
1229
proc->buffer = new_buffer;
952
1230
proc->buffer_size += BUFFER_SIZE;
953
1231
}
954
1232
/* Read from the process */
955
ret = read(proc->fd, proc->buffer + proc->buffer_length,
956
BUFFER_SIZE);
957
if(ret < 0){
1233
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1234
proc->buffer
1235
+ proc->buffer_length,
1236
BUFFER_SIZE));
1237
if(sret < 0){
958
1238
/* Read error from this process; ignore the error */
1239
proc = proc->next;
959
1240
continue;
960
1241
}
961
if(ret == 0){
1242
if(sret == 0){
962
1243
/* got EOF */
963
1244
proc->eof = true;
964
1245
} else {
965
proc->buffer_length += (size_t) ret;
1246
proc->buffer_length += (size_t) sret;
966
1247
}
967
1248
}
968
1249
}
969
970
1250
1251
971
1252
fallback:
972
1253
973
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1254
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1255
and exitstatus != EX_OK)){
974
1256
/* Fallback if all plugins failed, none are found or an error
975
1257
occured */
976
1258
bool bret;
977
1259
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
978
1260
char *passwordbuffer = getpass("Password: ");
979
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1261
size_t len = strlen(passwordbuffer);
1262
/* Strip trailing newline */
1263
if(len > 0 and passwordbuffer[len-1] == '\n'){
1264
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1265
len--;
1266
}
1267
bret = print_out_password(passwordbuffer, len);
980
1268
if(not bret){
981
perror("print_out_password");
982
exitstatus = EXIT_FAILURE;
1269
error(0, errno, "print_out_password");
1270
exitstatus = EX_IOERR;
983
1271
}
984
1272
}
985
1273
986
1274
/* Restore old signal handler */
987
1275
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
988
1276
if(ret == -1){
989
perror("sigaction");
990
exitstatus = EXIT_FAILURE;
1277
error(0, errno, "sigaction");
1278
exitstatus = EX_OSERR;
991
1279
}
992
1280
993
1281
if(custom_argv != NULL){
994
1282
for(char **arg = custom_argv+1; *arg != NULL; arg++){
995
1283
free(*arg);
997
1285
free(custom_argv);
998
1286
}
999
1287
1000
if(dir != NULL){
1001
closedir(dir);
1288
free(direntries);
1289
1290
if(dir_fd != -1){
1291
close(dir_fd);
1002
1292
}
1003
1293
1004
/* Free the process list and kill the processes */
1294
/* Kill the processes */
1005
1295
for(plugin *p = plugin_list; p != NULL; p = p->next){
1006
1296
if(p->pid != 0){
1007
1297
close(p->fd);
1008
1298
ret = kill(p->pid, SIGTERM);
1009
1299
if(ret == -1 and errno != ESRCH){
1010
1300
/* Set-uid proccesses might not get closed */
1011
perror("kill");
1301
error(0, errno, "kill");
1012
1302
}
1013
1303
}
1014
1304
}
1015
1305
1016
1306
/* Wait for any remaining child processes to terminate */
1017
do{
1307
do {
1018
1308
ret = wait(NULL);
1019
1309
} while(ret >= 0);
1020
1310
if(errno != ECHILD){
1021
perror("wait");
1311
error(0, errno, "wait");
1022
1312
}
1023
1313
1024
1314
free_plugin_list();
1025
1315
1026
1316
free(plugindir);
1317
free(pluginhelperdir);
1027
1318
free(argfile);
1028
1319
1029
1320
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0