To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 135
- compare with another revision
- download diff
- download tarball
- view history from revision 135
- Committer: Teddy Hogeborn
- Date: 2008-09-01 16:19:32 UTC
- Revision ID: teddy@fukt.bsnet.se-20080901161932-ostp7tulh9aijulh
* plugin-runner.c (add_environment): Never insert existing environment
variables.
(main): Rename "--global-envs" to "--global-env" and "--envs-for" to
"--env-for".
* plugin-runner.xml (SYNOPSIS): Rename "--global-envs" to
"--global-env" and "--envs-for" to
"--env-for".
(OPTIONS): Added "--global-env" and "--env-for".
(FALLBACK): Add id attribute.
(EXIT STATUS): Add text.
(ENVIRONMENT): New section.
(FILES): Document configuration file.
variables.
(main): Rename "--global-envs" to "--global-env" and "--envs-for" to
"--env-for".
* plugin-runner.xml (SYNOPSIS): Rename "--global-envs" to
"--global-env" and "--envs-for" to
"--env-for".
(OPTIONS): Added "--global-env" and "--env-for".
(FALLBACK): Add id attribute.
(EXIT STATUS): Add text.
(ENVIRONMENT): New section.
(FILES): Document configuration file.
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
19
18
* along with this program. If not, see
20
19
* <http://www.gnu.org/licenses/>.
21
20
*
22
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
22
*/
24
23
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
O_CLOEXEC */
25
asprintf() */
27
26
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* DIR, fdopendir(), fstat(), struct
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
36
35
uid_t, gid_t, getuid(), getgid(),
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
44
readdir(), closedir(), dirfd() */
47
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
48
FD_CLOEXEC, write(), STDOUT_FILENO,
49
struct stat, fstat(), close(),
50
setgid(), setuid(), S_ISREG(),
51
faccessat() pipe(), fork(),
52
_exit(), dup2(), fexecve(), read()
53
*/
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() */
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC, openat() */
56
#include <string.h> /* strsep, strlen(), strsignal(),
57
strcmp(), strncmp() */
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
58
55
#include <errno.h> /* errno */
59
56
#include <argp.h> /* struct argp_option, struct
60
57
argp_state, struct argp,
64
61
#include <signal.h> /* struct sigaction, sigemptyset(),
65
62
sigaddset(), sigaction(),
66
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
64
SIG_UNBLOCK, kill() */
69
65
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
75
#include <fnmatch.h> /* fnmatch() */
76
66
77
67
#define BUFFER_SIZE 256
78
68
79
69
#define PDIR "/lib/mandos/plugins.d"
80
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
71
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct plugin;
84
76
85
77
typedef struct plugin{
86
78
char *name; /* can be NULL or any plugin name */
89
81
char **environ;
90
82
int envc;
91
83
bool disabled;
92
84
93
85
/* Variables used for running processes*/
94
86
pid_t pid;
95
87
int fd;
97
89
size_t buffer_size;
98
90
size_t buffer_length;
99
91
bool eof;
100
volatile sig_atomic_t completed;
101
int status;
92
volatile bool completed;
93
volatile int status;
102
94
struct plugin *next;
103
95
} plugin;
104
96
105
97
static plugin *plugin_list = NULL;
106
98
107
/* Gets an existing plugin based on name,
99
/* Gets a existing plugin based on name,
108
100
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
101
static plugin *getplugin(char *name){
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))){
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))){
115
106
return p;
116
107
}
117
108
}
118
109
/* Create a new plugin */
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){
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
124
112
return NULL;
125
113
}
126
114
char *copy_name = NULL;
127
115
if(name != NULL){
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
131
117
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
135
118
return NULL;
136
119
}
137
120
}
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;
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){
149
129
free(copy_name);
150
130
free(new_plugin);
151
errno = e;
152
131
return NULL;
153
132
}
154
133
new_plugin->argv[0] = copy_name;
155
134
new_plugin->argv[1] = NULL;
156
135
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
136
new_plugin->environ = malloc(sizeof(char *));
160
137
if(new_plugin->environ == NULL){
161
int e = errno;
162
138
free(copy_name);
163
139
free(new_plugin->argv);
164
140
free(new_plugin);
165
errno = e;
166
141
return NULL;
167
142
}
168
143
new_plugin->environ[0] = NULL;
173
148
}
174
149
175
150
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
151
static bool add_to_char_array(const char *new, char ***array,
178
152
int *len){
179
153
/* Resize the pointed-to array to hold one more pointer */
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);
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
185
156
/* Malloc check */
186
if(new_array == NULL){
157
if(*array == NULL){
187
158
return false;
188
159
}
189
*array = new_array;
190
160
/* Make a copy of the new string */
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
161
char *copy = strdup(new);
195
162
if(copy == NULL){
196
163
return false;
197
164
}
204
171
}
205
172
206
173
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
174
static bool add_argument(plugin *p, const char *arg){
209
175
if(p == NULL){
210
176
return false;
213
179
}
214
180
215
181
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
217
static bool add_environment(plugin *p, const char *def, bool replace){
182
static bool add_environment(plugin *p, const char *def){
218
183
if(p == NULL){
219
184
return false;
220
185
}
221
186
/* namelen = length of name of environment variable */
222
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
188
/* 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
}
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
191
/* Refuse to add an existing variable */
238
192
return true;
239
193
}
240
194
}
244
198
/*
245
199
* Based on the example in the GNU LibC manual chapter 13.13 "File
246
200
* Descriptor Flags".
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
201
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
202
*/
249
__attribute__((warn_unused_result))
250
static int set_cloexec_flag(int fd){
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
203
static int set_cloexec_flag(int fd)
204
{
205
int ret = fcntl(fd, F_GETFD, 0);
252
206
/* If reading the flags failed, return error indication now. */
253
207
if(ret < 0){
254
208
return ret;
255
209
}
256
210
/* Store modified flag word in the descriptor. */
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
258
ret | FD_CLOEXEC));
211
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
259
212
}
260
213
261
214
262
215
/* Mark processes as completed when they exit, and save their exit
263
216
status. */
264
static void handle_sigchld(__attribute__((unused)) int sig){
265
int old_errno = errno;
217
void handle_sigchld(__attribute__((unused)) int sig){
266
218
while(true){
267
219
plugin *proc = plugin_list;
268
220
int status;
272
224
break;
273
225
}
274
226
if(pid == -1){
275
if(errno == ECHILD){
276
/* No child processes */
277
break;
227
if (errno != ECHILD){
228
perror("waitpid");
278
229
}
279
error(0, errno, "waitpid");
230
/* No child processes */
231
break;
280
232
}
281
233
282
234
/* A child exited, find it in process_list */
283
235
while(proc != NULL and proc->pid != pid){
284
236
proc = proc->next;
288
240
continue;
289
241
}
290
242
proc->status = status;
291
proc->completed = 1;
243
proc->completed = true;
292
244
}
293
errno = old_errno;
294
245
}
295
246
296
247
/* Prints out a password to stdout */
297
__attribute__((nonnull, warn_unused_result))
298
static bool print_out_password(const char *buffer, size_t length){
248
bool print_out_password(const char *buffer, size_t length){
299
249
ssize_t ret;
250
if(length>0 and buffer[length-1] == '\n'){
251
length--;
252
}
300
253
for(size_t written = 0; written < length; written += (size_t)ret){
301
254
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
302
255
length - written));
308
261
}
309
262
310
263
/* Removes and free a plugin from the plugin list */
311
__attribute__((nonnull))
312
264
static void free_plugin(plugin *plugin_node){
313
265
314
266
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
320
272
}
321
273
free(plugin_node->environ);
322
274
free(plugin_node->buffer);
323
275
324
276
/* Removes the plugin from the singly-linked list */
325
277
if(plugin_node == plugin_list){
326
278
/* First one - simple */
348
300
char *plugindir = NULL;
349
301
char *argfile = NULL;
350
302
FILE *conffp;
303
size_t d_name_len;
351
304
DIR *dir = NULL;
352
305
struct dirent *dirst;
353
306
struct stat st;
354
307
fd_set rfds_all;
355
308
int ret, maxfd = 0;
356
ssize_t sret;
357
309
uid_t uid = 65534;
358
310
gid_t gid = 65534;
359
311
bool debug = false;
363
315
.sa_flags = SA_NOCLDSTOP };
364
316
char **custom_argv = NULL;
365
317
int custom_argc = 0;
366
int dir_fd;
367
318
368
319
/* Establish a signal handler */
369
320
sigemptyset(&sigchld_action.sa_mask);
370
321
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
371
322
if(ret == -1){
372
error(0, errno, "sigaddset");
373
exitstatus = EX_OSERR;
323
perror("sigaddset");
324
exitstatus = EXIT_FAILURE;
374
325
goto fallback;
375
326
}
376
327
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
377
328
if(ret == -1){
378
error(0, errno, "sigaction");
379
exitstatus = EX_OSERR;
329
perror("sigaction");
330
exitstatus = EXIT_FAILURE;
380
331
goto fallback;
381
332
}
382
333
385
336
{ .name = "global-options", .key = 'g',
386
337
.arg = "OPTION[,OPTION[,...]]",
387
338
.doc = "Options passed to all plugins" },
388
{ .name = "global-env", .key = 'G',
339
{ .name = "global-env", .key = 'e',
389
340
.arg = "VAR=value",
390
341
.doc = "Environment variable passed to all plugins" },
391
342
{ .name = "options-for", .key = 'o',
392
343
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
393
344
.doc = "Options passed only to specified plugin" },
394
{ .name = "env-for", .key = 'E',
345
{ .name = "env-for", .key = 'f',
395
346
.arg = "PLUGIN:ENV=value",
396
347
.doc = "Environment variable passed to specified plugin" },
397
348
{ .name = "disable", .key = 'd',
398
349
.arg = "PLUGIN",
399
350
.doc = "Disable a specific plugin", .group = 1 },
400
{ .name = "enable", .key = 'e',
401
.arg = "PLUGIN",
402
.doc = "Enable a specific plugin", .group = 1 },
403
351
{ .name = "plugin-dir", .key = 128,
404
352
.arg = "DIRECTORY",
405
353
.doc = "Specify a different plugin directory", .group = 2 },
414
362
.doc = "Group ID the plugins will run as", .group = 3 },
415
363
{ .name = "debug", .key = 132,
416
364
.doc = "Debug mode", .group = 4 },
417
/*
418
* These reproduce what we would get without ARGP_NO_HELP
419
*/
420
{ .name = "help", .key = '?',
421
.doc = "Give this help list", .group = -1 },
422
{ .name = "usage", .key = -3,
423
.doc = "Give a short usage message", .group = -1 },
424
{ .name = "version", .key = 'V',
425
.doc = "Print program version", .group = -1 },
426
365
{ .name = NULL }
427
366
};
428
367
429
__attribute__((nonnull(3)))
430
error_t parse_opt(int key, char *arg, struct argp_state *state){
431
errno = 0;
432
switch(key){
433
char *tmp;
434
intmax_t tmp_id;
368
error_t parse_opt (int key, char *arg, __attribute__((unused))
369
struct argp_state *state) {
370
/* Get the INPUT argument from `argp_parse', which we know is a
371
pointer to our plugin list pointer. */
372
switch (key) {
435
373
case 'g': /* --global-options */
374
if (arg != NULL){
375
char *p;
376
while((p = strsep(&arg, ",")) != NULL){
377
if(p[0] == '\0'){
378
continue;
379
}
380
if(not add_argument(getplugin(NULL), p)){
381
perror("add_argument");
382
return ARGP_ERR_UNKNOWN;
383
}
384
}
385
}
386
break;
387
case 'e': /* --global-env */
388
if(arg == NULL){
389
break;
390
}
436
391
{
437
char *plugin_option;
438
while((plugin_option = strsep(&arg, ",")) != NULL){
439
if(not add_argument(getplugin(NULL), plugin_option)){
440
break;
441
}
442
}
443
errno = 0;
444
}
445
break;
446
case 'G': /* --global-env */
447
if(add_environment(getplugin(NULL), arg, true)){
448
errno = 0;
392
char *envdef = strdup(arg);
393
if(envdef == NULL){
394
break;
395
}
396
if(not add_environment(getplugin(NULL), envdef)){
397
perror("add_environment");
398
}
449
399
}
450
400
break;
451
401
case 'o': /* --options-for */
452
{
453
char *option_list = strchr(arg, ':');
454
if(option_list == NULL){
455
argp_error(state, "No colon in \"%s\"", arg);
456
errno = EINVAL;
457
break;
458
}
459
*option_list = '\0';
460
option_list++;
461
if(arg[0] == '\0'){
462
argp_error(state, "Empty plugin name");
463
errno = EINVAL;
464
break;
465
}
466
char *option;
467
while((option = strsep(&option_list, ",")) != NULL){
468
if(not add_argument(getplugin(arg), option)){
469
break;
402
if (arg != NULL){
403
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0'){
405
break;
406
}
407
char *opt = strsep(&arg, ":");
408
if(opt[0] == '\0'){
409
break;
410
}
411
if(opt != NULL){
412
char *p;
413
while((p = strsep(&opt, ",")) != NULL){
414
if(p[0] == '\0'){
415
continue;
416
}
417
if(not add_argument(getplugin(p_name), p)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
420
}
470
421
}
471
422
}
472
errno = 0;
473
423
}
474
424
break;
475
case 'E': /* --env-for */
425
case 'f': /* --env-for */
426
if(arg == NULL){
427
break;
428
}
476
429
{
477
430
char *envdef = strchr(arg, ':');
478
431
if(envdef == NULL){
479
argp_error(state, "No colon in \"%s\"", arg);
480
errno = EINVAL;
481
break;
482
}
483
*envdef = '\0';
432
break;
433
}
434
char *p_name = strndup(arg, (size_t) (envdef-arg));
435
if(p_name == NULL){
436
break;
437
}
484
438
envdef++;
485
if(arg[0] == '\0'){
486
argp_error(state, "Empty plugin name");
487
errno = EINVAL;
488
break;
489
}
490
if(add_environment(getplugin(arg), envdef, true)){
491
errno = 0;
439
if(not add_environment(getplugin(p_name), envdef)){
440
perror("add_environment");
492
441
}
493
442
}
494
443
break;
495
444
case 'd': /* --disable */
496
{
497
plugin *p = getplugin(arg);
498
if(p != NULL){
499
p->disabled = true;
500
errno = 0;
501
}
502
}
503
break;
504
case 'e': /* --enable */
505
{
506
plugin *p = getplugin(arg);
507
if(p != NULL){
508
p->disabled = false;
509
errno = 0;
510
}
445
if (arg != NULL){
446
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
449
}
450
p->disabled = true;
511
451
}
512
452
break;
513
453
case 128: /* --plugin-dir */
514
free(plugindir);
515
454
plugindir = strdup(arg);
516
if(plugindir != NULL){
517
errno = 0;
518
}
455
if(plugindir == NULL){
456
perror("strdup");
457
}
519
458
break;
520
459
case 129: /* --config-file */
521
/* This is already done by parse_opt_config_file() */
522
break;
460
argfile = strdup(arg);
461
if(argfile == NULL){
462
perror("strdup");
463
}
464
break;
523
465
case 130: /* --userid */
524
tmp_id = strtoimax(arg, &tmp, 10);
525
if(errno != 0 or tmp == arg or *tmp != '\0'
526
or tmp_id != (uid_t)tmp_id){
527
argp_error(state, "Bad user ID number: \"%s\", using %"
528
PRIdMAX, arg, (intmax_t)uid);
529
break;
530
}
531
uid = (uid_t)tmp_id;
532
errno = 0;
466
uid = (uid_t)strtol(arg, NULL, 10);
533
467
break;
534
468
case 131: /* --groupid */
535
tmp_id = strtoimax(arg, &tmp, 10);
536
if(errno != 0 or tmp == arg or *tmp != '\0'
537
or tmp_id != (gid_t)tmp_id){
538
argp_error(state, "Bad group ID number: \"%s\", using %"
539
PRIdMAX, arg, (intmax_t)gid);
540
break;
541
}
542
gid = (gid_t)tmp_id;
543
errno = 0;
469
gid = (gid_t)strtol(arg, NULL, 10);
544
470
break;
545
471
case 132: /* --debug */
546
472
debug = true;
547
473
break;
548
/*
549
* These reproduce what we would get without ARGP_NO_HELP
550
*/
551
case '?': /* --help */
552
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
553
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
554
case -3: /* --usage */
555
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
556
argp_state_help(state, state->out_stream,
557
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
558
case 'V': /* --version */
559
fprintf(state->out_stream, "%s\n", argp_program_version);
560
exit(EXIT_SUCCESS);
561
break;
562
/*
563
* When adding more options before this line, remember to also add a
564
* "case" to the "parse_opt_config_file" function below.
565
*/
566
case ARGP_KEY_ARG:
567
/* Cryptsetup always passes an argument, which is an empty
568
string if "none" was specified in /etc/crypttab. So if
569
argument was empty, we ignore it silently. */
570
if(arg[0] == '\0'){
571
break;
572
}
573
default:
574
return ARGP_ERR_UNKNOWN;
575
}
576
return errno; /* Set to 0 at start */
577
}
578
579
/* This option parser is the same as parse_opt() above, except it
580
ignores everything but the --config-file option. */
581
error_t parse_opt_config_file(int key, char *arg,
582
__attribute__((unused))
583
struct argp_state *state){
584
errno = 0;
585
switch(key){
586
case 'g': /* --global-options */
587
case 'G': /* --global-env */
588
case 'o': /* --options-for */
589
case 'E': /* --env-for */
590
case 'd': /* --disable */
591
case 'e': /* --enable */
592
case 128: /* --plugin-dir */
593
break;
594
case 129: /* --config-file */
595
free(argfile);
596
argfile = strdup(arg);
597
if(argfile != NULL){
598
errno = 0;
599
}
600
break;
601
case 130: /* --userid */
602
case 131: /* --groupid */
603
case 132: /* --debug */
604
case '?': /* --help */
605
case -3: /* --usage */
606
case 'V': /* --version */
607
case ARGP_KEY_ARG:
608
break;
609
default:
610
return ARGP_ERR_UNKNOWN;
611
}
612
return errno;
613
}
614
615
struct argp argp = { .options = options,
616
.parser = parse_opt_config_file,
617
.args_doc = "",
474
case ARGP_KEY_ARG:
475
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
476
break;
477
case ARGP_KEY_END:
478
break;
479
default:
480
return ARGP_ERR_UNKNOWN;
481
}
482
return 0;
483
}
484
485
struct argp argp = { .options = options, .parser = parse_opt,
486
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
618
487
.doc = "Mandos plugin runner -- Run plugins" };
619
488
620
/* Parse using parse_opt_config_file() in order to get the custom
621
config file location, if any. */
622
ret = argp_parse(&argp, argc, argv,
623
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
624
NULL, NULL);
625
switch(ret){
626
case 0:
627
break;
628
case ENOMEM:
629
default:
630
errno = ret;
631
error(0, errno, "argp_parse");
632
exitstatus = EX_OSERR;
633
goto fallback;
634
case EINVAL:
635
exitstatus = EX_USAGE;
489
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
490
if (ret == ARGP_ERR_UNKNOWN){
491
fprintf(stderr, "Unknown error while parsing arguments\n");
492
exitstatus = EXIT_FAILURE;
636
493
goto fallback;
637
494
}
638
639
/* Reset to the normal argument parser */
640
argp.parser = parse_opt;
641
642
/* Open the configfile if available */
643
if(argfile == NULL){
495
496
/* Opens the configfile if aviable */
497
if (argfile == NULL){
644
498
conffp = fopen(AFILE, "r");
645
499
} else {
646
500
conffp = fopen(argfile, "r");
647
}
501
}
648
502
if(conffp != NULL){
649
503
char *org_line = NULL;
650
504
char *p, *arg, *new_arg, *line;
651
505
size_t size = 0;
506
ssize_t sret;
652
507
const char whitespace_delims[] = " \r\t\f\v\n";
653
508
const char comment_delim[] = "#";
654
509
655
510
custom_argc = 1;
656
511
custom_argv = malloc(sizeof(char*) * 2);
657
512
if(custom_argv == NULL){
658
error(0, errno, "malloc");
659
exitstatus = EX_OSERR;
513
perror("malloc");
514
exitstatus = EXIT_FAILURE;
660
515
goto fallback;
661
516
}
662
517
custom_argv[0] = argv[0];
663
518
custom_argv[1] = NULL;
664
519
665
520
/* for each line in the config file, strip whitespace and ignore
666
521
commented text */
667
522
while(true){
669
524
if(sret == -1){
670
525
break;
671
526
}
672
527
673
528
line = org_line;
674
529
arg = strsep(&line, comment_delim);
675
530
while((p = strsep(&arg, whitespace_delims)) != NULL){
678
533
}
679
534
new_arg = strdup(p);
680
535
if(new_arg == NULL){
681
error(0, errno, "strdup");
682
exitstatus = EX_OSERR;
536
perror("strdup");
537
exitstatus = EXIT_FAILURE;
683
538
free(org_line);
684
539
goto fallback;
685
540
}
686
541
687
542
custom_argc += 1;
688
{
689
char **new_argv = realloc(custom_argv, sizeof(char *)
690
* ((unsigned int)
691
custom_argc + 1));
692
if(new_argv == NULL){
693
error(0, errno, "realloc");
694
exitstatus = EX_OSERR;
695
free(new_arg);
696
free(org_line);
697
goto fallback;
698
} else {
699
custom_argv = new_argv;
700
}
543
custom_argv = realloc(custom_argv, sizeof(char *)
544
* ((unsigned int) custom_argc + 1));
545
if(custom_argv == NULL){
546
perror("realloc");
547
exitstatus = EXIT_FAILURE;
548
free(org_line);
549
goto fallback;
701
550
}
702
551
custom_argv[custom_argc-1] = new_arg;
703
custom_argv[custom_argc] = NULL;
552
custom_argv[custom_argc] = NULL;
704
553
}
705
554
}
706
do {
707
ret = fclose(conffp);
708
} while(ret == EOF and errno == EINTR);
709
if(ret == EOF){
710
error(0, errno, "fclose");
711
exitstatus = EX_IOERR;
712
goto fallback;
713
}
714
555
free(org_line);
715
} else {
556
} else{
716
557
/* Check for harmful errors and go to fallback. Other errors might
717
558
not affect opening plugins */
718
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
719
error(0, errno, "fopen");
720
exitstatus = EX_OSERR;
559
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
560
perror("fopen");
561
exitstatus = EXIT_FAILURE;
721
562
goto fallback;
722
563
}
723
564
}
724
/* If there were any arguments from the configuration file, pass
725
them to parser as command line arguments */
565
/* If there was any arguments from configuration file,
566
pass them to parser as command arguments */
726
567
if(custom_argv != NULL){
727
ret = argp_parse(&argp, custom_argc, custom_argv,
728
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
729
NULL, NULL);
730
switch(ret){
731
case 0:
732
break;
733
case ENOMEM:
734
default:
735
errno = ret;
736
error(0, errno, "argp_parse");
737
exitstatus = EX_OSERR;
738
goto fallback;
739
case EINVAL:
740
exitstatus = EX_CONFIG;
568
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
569
if (ret == ARGP_ERR_UNKNOWN){
570
fprintf(stderr, "Unknown error while parsing arguments\n");
571
exitstatus = EXIT_FAILURE;
741
572
goto fallback;
742
573
}
743
574
}
744
575
745
/* Parse actual command line arguments, to let them override the
746
config file */
747
ret = argp_parse(&argp, argc, argv,
748
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
749
NULL, NULL);
750
switch(ret){
751
case 0:
752
break;
753
case ENOMEM:
754
default:
755
errno = ret;
756
error(0, errno, "argp_parse");
757
exitstatus = EX_OSERR;
758
goto fallback;
759
case EINVAL:
760
exitstatus = EX_USAGE;
761
goto fallback;
762
}
763
764
576
if(debug){
765
577
for(plugin *p = plugin_list; p != NULL; p=p->next){
766
578
fprintf(stderr, "Plugin: %s has %d arguments\n",
768
580
for(char **a = p->argv; *a != NULL; a++){
769
581
fprintf(stderr, "\tArg: %s\n", *a);
770
582
}
771
fprintf(stderr, "...and %d environment variables\n", p->envc);
583
fprintf(stderr, "...and %u environment variables\n", p->envc);
772
584
for(char **a = p->environ; *a != NULL; a++){
773
585
fprintf(stderr, "\t%s\n", *a);
774
586
}
775
587
}
776
588
}
777
778
if(getuid() == 0){
779
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
if(plugindir_fd == -1){
783
if(errno != ENOENT){
784
error(0, errno, "open(\"" PDIR "\")");
785
}
786
} else {
787
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
788
if(ret == -1){
789
error(0, errno, "fstat");
790
} else {
791
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
792
ret = fchown(plugindir_fd, uid, gid);
793
if(ret == -1){
794
error(0, errno, "fchown");
795
}
796
}
797
}
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
799
}
800
}
801
802
/* Lower permissions */
803
ret = setgid(gid);
804
if(ret == -1){
805
error(0, errno, "setgid");
806
}
589
590
/* Strip permissions down to nobody */
807
591
ret = setuid(uid);
808
if(ret == -1){
809
error(0, errno, "setuid");
810
}
811
812
/* Open plugin directory with close_on_exec flag */
592
if (ret == -1){
593
perror("setuid");
594
}
595
setgid(gid);
596
if (ret == -1){
597
perror("setgid");
598
}
599
600
if (plugindir == NULL){
601
dir = opendir(PDIR);
602
} else {
603
dir = opendir(plugindir);
604
}
605
606
if(dir == NULL){
607
perror("Could not open plugin dir");
608
exitstatus = EXIT_FAILURE;
609
goto fallback;
610
}
611
612
/* Set the FD_CLOEXEC flag on the directory, if possible */
813
613
{
814
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
815
#ifdef O_CLOEXEC
816
O_CLOEXEC
817
#else /* not O_CLOEXEC */
818
0
819
#endif /* not O_CLOEXEC */
820
);
821
if(dir_fd == -1){
822
error(0, errno, "Could not open plugin dir");
823
exitstatus = EX_UNAVAILABLE;
824
goto fallback;
825
}
826
827
#ifndef O_CLOEXEC
828
/* Set the FD_CLOEXEC flag on the directory */
829
ret = set_cloexec_flag(dir_fd);
830
if(ret < 0){
831
error(0, errno, "set_cloexec_flag");
832
TEMP_FAILURE_RETRY(close(dir_fd));
833
exitstatus = EX_OSERR;
834
goto fallback;
835
}
836
#endif /* O_CLOEXEC */
837
838
dir = fdopendir(dir_fd);
839
if(dir == NULL){
840
error(0, errno, "Could not open plugin dir");
841
TEMP_FAILURE_RETRY(close(dir_fd));
842
exitstatus = EX_OSERR;
843
goto fallback;
614
int dir_fd = dirfd(dir);
615
if(dir_fd >= 0){
616
ret = set_cloexec_flag(dir_fd);
617
if(ret < 0){
618
perror("set_cloexec_flag");
619
exitstatus = EXIT_FAILURE;
620
goto fallback;
621
}
844
622
}
845
623
}
846
624
847
625
FD_ZERO(&rfds_all);
848
626
849
627
/* Read and execute any executable in the plugin directory*/
850
628
while(true){
851
do {
852
dirst = readdir(dir);
853
} while(dirst == NULL and errno == EINTR);
629
dirst = readdir(dir);
854
630
855
/* All directory entries have been processed */
631
// All directory entries have been processed
856
632
if(dirst == NULL){
857
if(errno == EBADF){
858
error(0, errno, "readdir");
859
exitstatus = EX_IOERR;
633
if (errno == EBADF){
634
perror("readdir");
635
exitstatus = EXIT_FAILURE;
860
636
goto fallback;
861
637
}
862
638
break;
863
639
}
864
640
865
/* Ignore dotfiles, backup files and other junk */
641
d_name_len = strlen(dirst->d_name);
642
643
// Ignore dotfiles, backup files and other junk
866
644
{
867
645
bool bad_name = false;
868
const char * const patterns[] = { ".*", "#*#", "*~",
869
"*.dpkg-new", "*.dpkg-old",
870
"*.dpkg-bak", "*.dpkg-divert",
871
NULL };
872
#ifdef __GNUC__
873
#pragma GCC diagnostic push
874
#pragma GCC diagnostic ignored "-Wcast-qual"
875
#endif
876
for(const char **pat = (const char **)patterns;
877
*pat != NULL; pat++){
878
#ifdef __GNUC__
879
#pragma GCC diagnostic pop
880
#endif
881
if(fnmatch(*pat, dirst->d_name,
882
FNM_FILE_NAME | FNM_PERIOD) != FNM_NOMATCH){
883
if(debug){
884
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
885
" matching pattern %s\n", dirst->d_name, *pat);
886
}
887
bad_name = true;
888
break;
889
}
890
}
891
if(bad_name){
892
continue;
893
}
894
}
895
896
int plugin_fd = openat(dir_fd, dirst->d_name, O_RDONLY |
897
#ifdef O_CLOEXEC
898
O_CLOEXEC
899
#else /* not O_CLOEXEC */
900
0
901
#endif /* not O_CLOEXEC */
902
);
903
if(plugin_fd == -1){
904
error(0, errno, "Could not open plugin");
905
continue;
906
}
907
#ifndef O_CLOEXEC
908
/* Set the FD_CLOEXEC flag on the plugin FD */
909
ret = set_cloexec_flag(plugin_fd);
646
647
const char const *bad_prefixes[] = { ".", "#", NULL };
648
649
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
650
".dpkg-old",
651
".dpkg-divert", NULL };
652
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
653
size_t pre_len = strlen(*pre);
654
if((d_name_len >= pre_len)
655
and strncmp((dirst->d_name), *pre, pre_len) == 0){
656
if(debug){
657
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
658
" with bad prefix %s\n", dirst->d_name, *pre);
659
}
660
bad_name = true;
661
break;
662
}
663
}
664
if(bad_name){
665
continue;
666
}
667
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
668
size_t suf_len = strlen(*suf);
669
if((d_name_len >= suf_len)
670
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
671
== 0)){
672
if(debug){
673
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
674
" with bad suffix %s\n", dirst->d_name, *suf);
675
}
676
bad_name = true;
677
break;
678
}
679
}
680
681
if(bad_name){
682
continue;
683
}
684
}
685
686
char *filename;
687
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
910
688
if(ret < 0){
911
error(0, errno, "set_cloexec_flag");
912
TEMP_FAILURE_RETRY(close(plugin_fd));
913
continue;
914
}
915
#endif /* O_CLOEXEC */
916
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
917
if(ret == -1){
918
error(0, errno, "stat");
919
TEMP_FAILURE_RETRY(close(plugin_fd));
689
perror("asprintf");
920
690
continue;
921
691
}
922
692
693
ret = stat(filename, &st);
694
if (ret == -1){
695
perror("stat");
696
free(filename);
697
continue;
698
}
699
923
700
/* Ignore non-executable files */
924
if(not S_ISREG(st.st_mode)
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, dirst->d_name, X_OK,
926
0)) != 0)){
701
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
927
702
if(debug){
928
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
929
" with bad type or mode\n",
930
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
703
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
704
" with bad type or mode\n", filename);
931
705
}
932
TEMP_FAILURE_RETRY(close(plugin_fd));
706
free(filename);
933
707
continue;
934
708
}
935
709
936
710
plugin *p = getplugin(dirst->d_name);
937
711
if(p == NULL){
938
error(0, errno, "getplugin");
939
TEMP_FAILURE_RETRY(close(plugin_fd));
712
perror("getplugin");
713
free(filename);
940
714
continue;
941
715
}
942
716
if(p->disabled){
944
718
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
945
719
dirst->d_name);
946
720
}
947
TEMP_FAILURE_RETRY(close(plugin_fd));
721
free(filename);
948
722
continue;
949
723
}
950
724
{
953
727
if(g != NULL){
954
728
for(char **a = g->argv + 1; *a != NULL; a++){
955
729
if(not add_argument(p, *a)){
956
error(0, errno, "add_argument");
730
perror("add_argument");
957
731
}
958
732
}
959
733
/* Add global environment variables */
960
734
for(char **e = g->environ; *e != NULL; e++){
961
if(not add_environment(p, *e, false)){
962
error(0, errno, "add_environment");
735
if(not add_environment(p, *e)){
736
perror("add_environment");
963
737
}
964
738
}
965
739
}
966
740
}
967
/* If this plugin has any environment variables, we need to
968
duplicate the environment from this process, too. */
741
/* If this plugin has any environment variables, we will call
742
using execve and need to duplicate the environment from this
743
process, too. */
969
744
if(p->environ[0] != NULL){
970
745
for(char **e = environ; *e != NULL; e++){
971
if(not add_environment(p, *e, false)){
972
error(0, errno, "add_environment");
746
char *copy = strdup(*e);
747
if(copy == NULL){
748
perror("strdup");
749
continue;
750
}
751
if(not add_environment(p, copy)){
752
perror("add_environment");
973
753
}
974
754
}
975
755
}
976
756
977
757
int pipefd[2];
978
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
979
if(ret == -1){
980
error(0, errno, "pipe");
981
exitstatus = EX_OSERR;
758
ret = pipe(pipefd);
759
if (ret == -1){
760
perror("pipe");
761
exitstatus = EXIT_FAILURE;
982
762
goto fallback;
983
763
}
984
764
/* Ask OS to automatic close the pipe on exec */
985
765
ret = set_cloexec_flag(pipefd[0]);
986
766
if(ret < 0){
987
error(0, errno, "set_cloexec_flag");
988
exitstatus = EX_OSERR;
767
perror("set_cloexec_flag");
768
exitstatus = EXIT_FAILURE;
989
769
goto fallback;
990
770
}
991
771
ret = set_cloexec_flag(pipefd[1]);
992
772
if(ret < 0){
993
error(0, errno, "set_cloexec_flag");
994
exitstatus = EX_OSERR;
773
perror("set_cloexec_flag");
774
exitstatus = EXIT_FAILURE;
995
775
goto fallback;
996
776
}
997
777
/* Block SIGCHLD until process is safely in process list */
998
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
999
&sigchld_action.sa_mask,
1000
NULL));
778
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1001
779
if(ret < 0){
1002
error(0, errno, "sigprocmask");
1003
exitstatus = EX_OSERR;
780
perror("sigprocmask");
781
exitstatus = EXIT_FAILURE;
1004
782
goto fallback;
1005
783
}
1006
/* Starting a new process to be watched */
1007
pid_t pid;
1008
do {
1009
pid = fork();
1010
} while(pid == -1 and errno == EINTR);
784
// Starting a new process to be watched
785
pid_t pid = fork();
1011
786
if(pid == -1){
1012
error(0, errno, "fork");
1013
exitstatus = EX_OSERR;
787
perror("fork");
788
exitstatus = EXIT_FAILURE;
1014
789
goto fallback;
1015
790
}
1016
791
if(pid == 0){
1017
792
/* this is the child process */
1018
793
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1019
794
if(ret < 0){
1020
error(0, errno, "sigaction");
1021
_exit(EX_OSERR);
795
perror("sigaction");
796
_exit(EXIT_FAILURE);
1022
797
}
1023
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
798
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1024
799
if(ret < 0){
1025
error(0, errno, "sigprocmask");
1026
_exit(EX_OSERR);
800
perror("sigprocmask");
801
_exit(EXIT_FAILURE);
1027
802
}
1028
803
1029
804
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1030
805
if(ret == -1){
1031
error(0, errno, "dup2");
1032
_exit(EX_OSERR);
806
perror("dup2");
807
_exit(EXIT_FAILURE);
1033
808
}
1034
809
1035
810
if(dirfd(dir) < 0){
1037
812
above and must now close it manually here. */
1038
813
closedir(dir);
1039
814
}
1040
if(fexecve(plugin_fd, p->argv,
1041
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1042
error(0, errno, "fexecve for %s/%s",
1043
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
1044
_exit(EX_OSERR);
815
if(p->environ[0] == NULL){
816
if(execv(filename, p->argv) < 0){
817
perror("execv");
818
_exit(EXIT_FAILURE);
819
}
820
} else {
821
if(execve(filename, p->argv, p->environ) < 0){
822
perror("execve");
823
_exit(EXIT_FAILURE);
824
}
1045
825
}
1046
826
/* no return */
1047
827
}
1048
828
/* Parent process */
1049
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1050
pipe */
1051
TEMP_FAILURE_RETRY(close(plugin_fd));
829
close(pipefd[1]); /* Close unused write end of pipe */
830
free(filename);
1052
831
plugin *new_plugin = getplugin(dirst->d_name);
1053
if(new_plugin == NULL){
1054
error(0, errno, "getplugin");
1055
ret = (int)(TEMP_FAILURE_RETRY
1056
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1057
NULL)));
832
if (new_plugin == NULL){
833
perror("getplugin");
834
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1058
835
if(ret < 0){
1059
error(0, errno, "sigprocmask");
836
perror("sigprocmask");
1060
837
}
1061
exitstatus = EX_OSERR;
838
exitstatus = EXIT_FAILURE;
1062
839
goto fallback;
1063
840
}
1064
841
1067
844
1068
845
/* Unblock SIGCHLD so signal handler can be run if this process
1069
846
has already completed */
1070
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1071
&sigchld_action.sa_mask,
1072
NULL));
847
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1073
848
if(ret < 0){
1074
error(0, errno, "sigprocmask");
1075
exitstatus = EX_OSERR;
849
perror("sigprocmask");
850
exitstatus = EXIT_FAILURE;
1076
851
goto fallback;
1077
852
}
1078
853
1079
#if defined (__GNUC__) and defined (__GLIBC__)
1080
#if not __GLIBC_PREREQ(2, 16)
1081
#pragma GCC diagnostic push
1082
#pragma GCC diagnostic ignored "-Wsign-conversion"
1083
#endif
1084
#endif
1085
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1086
-Wconversion in GNU libc
1087
before 2.16 */
1088
#if defined (__GNUC__) and defined (__GLIBC__)
1089
#if not __GLIBC_PREREQ(2, 16)
1090
#pragma GCC diagnostic pop
1091
#endif
1092
#endif
854
FD_SET(new_plugin->fd, &rfds_all);
1093
855
1094
if(maxfd < new_plugin->fd){
856
if (maxfd < new_plugin->fd){
1095
857
maxfd = new_plugin->fd;
1096
858
}
859
1097
860
}
1098
861
1099
TEMP_FAILURE_RETRY(closedir(dir));
862
closedir(dir);
1100
863
dir = NULL;
1101
free_plugin(getplugin(NULL));
1102
864
1103
865
for(plugin *p = plugin_list; p != NULL; p = p->next){
1104
866
if(p->pid != 0){
1105
867
break;
1110
872
free_plugin_list();
1111
873
}
1112
874
}
1113
875
1114
876
/* Main loop while running plugins exist */
1115
877
while(plugin_list){
1116
878
fd_set rfds = rfds_all;
1117
879
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1118
if(select_ret == -1 and errno != EINTR){
1119
error(0, errno, "select");
1120
exitstatus = EX_OSERR;
880
if (select_ret == -1){
881
perror("select");
882
exitstatus = EXIT_FAILURE;
1121
883
goto fallback;
1122
884
}
1123
885
/* OK, now either a process completed, or something can be read
1124
886
from one of them */
1125
for(plugin *proc = plugin_list; proc != NULL;){
887
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1126
888
/* Is this process completely done? */
1127
if(proc->completed and proc->eof){
889
if(proc->eof and proc->completed){
1128
890
/* Only accept the plugin output if it exited cleanly */
1129
891
if(not WIFEXITED(proc->status)
1130
892
or WEXITSTATUS(proc->status) != 0){
1131
893
/* Bad exit by plugin */
1132
894
1133
895
if(debug){
1134
896
if(WIFEXITED(proc->status)){
1135
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1136
" status %d\n", proc->name,
1137
(intmax_t) (proc->pid),
897
fprintf(stderr, "Plugin %u exited with status %d\n",
898
(unsigned int) (proc->pid),
1138
899
WEXITSTATUS(proc->status));
1139
} else if(WIFSIGNALED(proc->status)){
1140
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1141
" signal %d: %s\n", proc->name,
1142
(intmax_t) (proc->pid),
1143
WTERMSIG(proc->status),
1144
strsignal(WTERMSIG(proc->status)));
900
} else if(WIFSIGNALED(proc->status)) {
901
fprintf(stderr, "Plugin %u killed by signal %d\n",
902
(unsigned int) (proc->pid),
903
WTERMSIG(proc->status));
1145
904
} else if(WCOREDUMP(proc->status)){
1146
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1147
" core\n", proc->name, (intmax_t) (proc->pid));
905
fprintf(stderr, "Plugin %d dumped core\n",
906
(unsigned int) (proc->pid));
1148
907
}
1149
908
}
1150
909
1151
910
/* Remove the plugin */
1152
#if defined (__GNUC__) and defined (__GLIBC__)
1153
#if not __GLIBC_PREREQ(2, 16)
1154
#pragma GCC diagnostic push
1155
#pragma GCC diagnostic ignored "-Wsign-conversion"
1156
#endif
1157
#endif
1158
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1159
-Wconversion in GNU libc
1160
before 2.16 */
1161
#if defined (__GNUC__) and defined (__GLIBC__)
1162
#if not __GLIBC_PREREQ(2, 16)
1163
#pragma GCC diagnostic pop
1164
#endif
1165
#endif
1166
911
FD_CLR(proc->fd, &rfds_all);
912
1167
913
/* Block signal while modifying process_list */
1168
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1169
(SIG_BLOCK,
1170
&sigchld_action.sa_mask,
1171
NULL));
914
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1172
915
if(ret < 0){
1173
error(0, errno, "sigprocmask");
1174
exitstatus = EX_OSERR;
916
perror("sigprocmask");
917
exitstatus = EXIT_FAILURE;
1175
918
goto fallback;
1176
919
}
1177
1178
plugin *next_plugin = proc->next;
1179
920
free_plugin(proc);
1180
proc = next_plugin;
1181
1182
921
/* We are done modifying process list, so unblock signal */
1183
ret = (int)(TEMP_FAILURE_RETRY
1184
(sigprocmask(SIG_UNBLOCK,
1185
&sigchld_action.sa_mask, NULL)));
922
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
923
NULL);
1186
924
if(ret < 0){
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
925
perror("sigprocmask");
926
exitstatus = EXIT_FAILURE;
1189
927
goto fallback;
1190
928
}
1191
929
1192
930
if(plugin_list == NULL){
1193
931
break;
1194
932
}
1195
1196
933
continue;
1197
934
}
1198
935
1199
936
/* This process exited nicely, so print its buffer */
1200
937
1201
938
bool bret = print_out_password(proc->buffer,
1202
939
proc->buffer_length);
1203
940
if(not bret){
1204
error(0, errno, "print_out_password");
1205
exitstatus = EX_IOERR;
941
perror("print_out_password");
942
exitstatus = EXIT_FAILURE;
1206
943
}
1207
944
goto fallback;
1208
945
}
1209
946
1210
947
/* This process has not completed. Does it have any output? */
1211
#if defined (__GNUC__) and defined (__GLIBC__)
1212
#if not __GLIBC_PREREQ(2, 16)
1213
#pragma GCC diagnostic push
1214
#pragma GCC diagnostic ignored "-Wsign-conversion"
1215
#endif
1216
#endif
1217
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1218
warning from
1219
-Wconversion
1220
in GNU libc
1221
before
1222
2.16 */
1223
#if defined (__GNUC__) and defined (__GLIBC__)
1224
#if not __GLIBC_PREREQ(2, 16)
1225
#pragma GCC diagnostic pop
1226
#endif
1227
#endif
948
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1228
949
/* This process had nothing to say at this time */
1229
proc = proc->next;
1230
950
continue;
1231
951
}
1232
952
/* Before reading, make the process' data buffer large enough */
1233
953
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1234
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1235
+ (size_t) BUFFER_SIZE);
1236
if(new_buffer == NULL){
1237
error(0, errno, "malloc");
1238
exitstatus = EX_OSERR;
954
proc->buffer = realloc(proc->buffer, proc->buffer_size
955
+ (size_t) BUFFER_SIZE);
956
if (proc->buffer == NULL){
957
perror("malloc");
958
exitstatus = EXIT_FAILURE;
1239
959
goto fallback;
1240
960
}
1241
proc->buffer = new_buffer;
1242
961
proc->buffer_size += BUFFER_SIZE;
1243
962
}
1244
963
/* Read from the process */
1245
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1246
proc->buffer
1247
+ proc->buffer_length,
1248
BUFFER_SIZE));
1249
if(sret < 0){
964
ret = read(proc->fd, proc->buffer + proc->buffer_length,
965
BUFFER_SIZE);
966
if(ret < 0){
1250
967
/* Read error from this process; ignore the error */
1251
proc = proc->next;
1252
968
continue;
1253
969
}
1254
if(sret == 0){
970
if(ret == 0){
1255
971
/* got EOF */
1256
972
proc->eof = true;
1257
973
} else {
1258
proc->buffer_length += (size_t) sret;
974
proc->buffer_length += (size_t) ret;
1259
975
}
1260
976
}
1261
977
}
1262
1263
978
979
1264
980
fallback:
1265
981
1266
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1267
and exitstatus != EX_OK)){
982
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1268
983
/* Fallback if all plugins failed, none are found or an error
1269
984
occured */
1270
985
bool bret;
1271
986
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1272
987
char *passwordbuffer = getpass("Password: ");
1273
size_t len = strlen(passwordbuffer);
1274
/* Strip trailing newline */
1275
if(len > 0 and passwordbuffer[len-1] == '\n'){
1276
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1277
len--;
1278
}
1279
bret = print_out_password(passwordbuffer, len);
988
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1280
989
if(not bret){
1281
error(0, errno, "print_out_password");
1282
exitstatus = EX_IOERR;
990
perror("print_out_password");
991
exitstatus = EXIT_FAILURE;
1283
992
}
1284
993
}
1285
994
1286
995
/* Restore old signal handler */
1287
996
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1288
997
if(ret == -1){
1289
error(0, errno, "sigaction");
1290
exitstatus = EX_OSERR;
998
perror("sigaction");
999
exitstatus = EXIT_FAILURE;
1291
1000
}
1292
1001
1293
1002
if(custom_argv != NULL){
1294
1003
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1295
1004
free(*arg);
1301
1010
closedir(dir);
1302
1011
}
1303
1012
1304
/* Kill the processes */
1013
/* Free the process list and kill the processes */
1305
1014
for(plugin *p = plugin_list; p != NULL; p = p->next){
1306
1015
if(p->pid != 0){
1307
1016
close(p->fd);
1308
1017
ret = kill(p->pid, SIGTERM);
1309
1018
if(ret == -1 and errno != ESRCH){
1310
1019
/* Set-uid proccesses might not get closed */
1311
error(0, errno, "kill");
1020
perror("kill");
1312
1021
}
1313
1022
}
1314
1023
}
1315
1024
1316
1025
/* Wait for any remaining child processes to terminate */
1317
do {
1026
do{
1318
1027
ret = wait(NULL);
1319
1028
} while(ret >= 0);
1320
1029
if(errno != ECHILD){
1321
error(0, errno, "wait");
1030
perror("wait");
1322
1031
}
1323
1032
1324
1033
free_plugin_list();
1325
1034
1326
1035
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0