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- Committer: Teddy Hogeborn
- Date: 2014-03-01 09:39:25 UTC
- Revision ID: teddy@recompile.se-20140301093925-0x6nwf21f0zljk6e
* debian/copyright: Change year to "2014".
* mandos-ctl: - '' -
* mandos-monitor: - '' -
* plugins.d/mandos-client.xml: - '' -
* mandos-ctl: - '' -
* mandos-monitor: - '' -
* plugins.d/mandos-client.xml: - '' -
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008-2013 Teddy Hogeborn
6
* Copyright © 2008-2013 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
asprintf(), O_CLOEXEC */
26
27
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
35
36
uid_t, gid_t, getuid(), getgid(),
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
41
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
46
readdir(), closedir(), dirfd() */
45
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
48
fcntl(), setuid(), setgid(),
47
49
F_GETFD, F_SETFD, FD_CLOEXEC,
48
50
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
51
dup2(), STDOUT_FILENO, _exit(),
50
52
execv(), write(), read(),
51
53
close() */
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
55
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
55
58
#include <errno.h> /* errno */
56
59
#include <argp.h> /* struct argp_option, struct
57
60
argp_state, struct argp,
61
64
#include <signal.h> /* struct sigaction, sigemptyset(),
62
65
sigaddset(), sigaction(),
63
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
66
75
67
76
#define BUFFER_SIZE 256
68
77
69
78
#define PDIR "/lib/mandos/plugins.d"
70
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
80
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct plugin;
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
83
77
84
typedef struct plugin{
78
85
char *name; /* can be NULL or any plugin name */
81
88
char **environ;
82
89
int envc;
83
90
bool disabled;
84
91
85
92
/* Variables used for running processes*/
86
93
pid_t pid;
87
94
int fd;
89
96
size_t buffer_size;
90
97
size_t buffer_length;
91
98
bool eof;
92
volatile bool completed;
93
volatile int status;
99
volatile sig_atomic_t completed;
100
int status;
94
101
struct plugin *next;
95
102
} plugin;
96
103
97
104
static plugin *plugin_list = NULL;
98
105
99
/* Gets a existing plugin based on name,
106
/* Gets an existing plugin based on name,
100
107
or if none is found, creates a new one */
101
108
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))){
109
/* Check for existing plugin with that name */
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
if((p->name == name)
112
or (p->name and name and (strcmp(p->name, name) == 0))){
106
113
return p;
107
114
}
108
115
}
109
116
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
121
if(new_plugin == NULL){
112
122
return NULL;
113
123
}
114
124
char *copy_name = NULL;
115
125
if(name != NULL){
116
copy_name = strdup(name);
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
117
129
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
118
133
return NULL;
119
134
}
120
135
}
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){
136
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
141
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
145
if(new_plugin->argv == NULL){
146
int e = errno;
129
147
free(copy_name);
130
148
free(new_plugin);
149
errno = e;
131
150
return NULL;
132
151
}
133
152
new_plugin->argv[0] = copy_name;
134
153
new_plugin->argv[1] = NULL;
135
136
new_plugin->environ = malloc(sizeof(char *));
154
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
137
158
if(new_plugin->environ == NULL){
159
int e = errno;
138
160
free(copy_name);
139
161
free(new_plugin->argv);
140
162
free(new_plugin);
163
errno = e;
141
164
return NULL;
142
165
}
143
166
new_plugin->environ[0] = NULL;
144
167
145
168
/* Append the new plugin to the list */
146
169
plugin_list = new_plugin;
147
170
return new_plugin;
148
171
}
149
172
150
173
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
151
175
static bool add_to_char_array(const char *new, char ***array,
152
176
int *len){
153
177
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
178
do {
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
156
182
/* Malloc check */
157
183
if(*array == NULL){
158
184
return false;
159
185
}
160
186
/* Make a copy of the new string */
161
char *copy = strdup(new);
187
char *copy;
188
do {
189
copy = strdup(new);
190
} while(copy == NULL and errno == EINTR);
162
191
if(copy == NULL){
163
192
return false;
164
193
}
171
200
}
172
201
173
202
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
174
204
static bool add_argument(plugin *p, const char *arg){
175
205
if(p == NULL){
176
206
return false;
179
209
}
180
210
181
211
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def){
212
__attribute__((nonnull(2)))
213
static bool add_environment(plugin *p, const char *def, bool replace){
183
214
if(p == NULL){
184
215
return false;
185
216
}
217
/* namelen = length of name of environment variable */
218
size_t namelen = (size_t)(strchrnul(def, '=') - def);
219
/* Search for this environment variable */
220
for(char **e = p->environ; *e != NULL; e++){
221
if(strncmp(*e, def, namelen + 1) == 0){
222
/* It already exists */
223
if(replace){
224
char *new;
225
do {
226
new = realloc(*e, strlen(def) + 1);
227
} while(new == NULL and errno == EINTR);
228
if(new == NULL){
229
return false;
230
}
231
*e = new;
232
strcpy(*e, def);
233
}
234
return true;
235
}
236
}
186
237
return add_to_char_array(def, &(p->environ), &(p->envc));
187
238
}
188
239
189
240
/*
190
241
* Based on the example in the GNU LibC manual chapter 13.13 "File
191
242
* Descriptor Flags".
192
* *Note File Descriptor Flags:(libc)Descriptor Flags.
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
193
244
*/
194
static int set_cloexec_flag(int fd)
195
{
196
int ret = fcntl(fd, F_GETFD, 0);
245
static int set_cloexec_flag(int fd){
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
197
247
/* If reading the flags failed, return error indication now. */
198
248
if(ret < 0){
199
249
return ret;
200
250
}
201
251
/* Store modified flag word in the descriptor. */
202
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
253
ret | FD_CLOEXEC));
203
254
}
204
255
205
256
206
257
/* Mark processes as completed when they exit, and save their exit
207
258
status. */
208
void handle_sigchld(__attribute__((unused)) int sig){
259
static void handle_sigchld(__attribute__((unused)) int sig){
260
int old_errno = errno;
209
261
while(true){
210
262
plugin *proc = plugin_list;
211
263
int status;
215
267
break;
216
268
}
217
269
if(pid == -1){
218
if (errno != ECHILD){
219
perror("waitpid");
270
if(errno == ECHILD){
271
/* No child processes */
272
break;
220
273
}
221
/* No child processes */
222
break;
274
error(0, errno, "waitpid");
223
275
}
224
276
225
277
/* A child exited, find it in process_list */
226
278
while(proc != NULL and proc->pid != pid){
227
279
proc = proc->next;
231
283
continue;
232
284
}
233
285
proc->status = status;
234
proc->completed = true;
286
proc->completed = 1;
235
287
}
288
errno = old_errno;
236
289
}
237
290
238
291
/* Prints out a password to stdout */
239
bool print_out_password(const char *buffer, size_t length){
292
__attribute__((nonnull))
293
static bool print_out_password(const char *buffer, size_t length){
240
294
ssize_t ret;
241
if(length>0 and buffer[length-1] == '\n'){
242
length--;
243
}
244
295
for(size_t written = 0; written < length; written += (size_t)ret){
245
296
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
246
297
length - written));
252
303
}
253
304
254
305
/* Removes and free a plugin from the plugin list */
306
__attribute__((nonnull))
255
307
static void free_plugin(plugin *plugin_node){
256
308
257
309
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
263
315
}
264
316
free(plugin_node->environ);
265
317
free(plugin_node->buffer);
266
318
267
319
/* Removes the plugin from the singly-linked list */
268
320
if(plugin_node == plugin_list){
269
321
/* First one - simple */
297
349
struct stat st;
298
350
fd_set rfds_all;
299
351
int ret, maxfd = 0;
352
ssize_t sret;
300
353
uid_t uid = 65534;
301
354
gid_t gid = 65534;
302
355
bool debug = false;
311
364
sigemptyset(&sigchld_action.sa_mask);
312
365
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
313
366
if(ret == -1){
314
perror("sigaddset");
315
exitstatus = EXIT_FAILURE;
367
error(0, errno, "sigaddset");
368
exitstatus = EX_OSERR;
316
369
goto fallback;
317
370
}
318
371
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
319
372
if(ret == -1){
320
perror("sigaction");
321
exitstatus = EXIT_FAILURE;
373
error(0, errno, "sigaction");
374
exitstatus = EX_OSERR;
322
375
goto fallback;
323
376
}
324
377
327
380
{ .name = "global-options", .key = 'g',
328
381
.arg = "OPTION[,OPTION[,...]]",
329
382
.doc = "Options passed to all plugins" },
330
{ .name = "global-envs", .key = 'e',
383
{ .name = "global-env", .key = 'G',
331
384
.arg = "VAR=value",
332
385
.doc = "Environment variable passed to all plugins" },
333
386
{ .name = "options-for", .key = 'o',
334
387
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
335
388
.doc = "Options passed only to specified plugin" },
336
{ .name = "envs-for", .key = 'f',
389
{ .name = "env-for", .key = 'E',
337
390
.arg = "PLUGIN:ENV=value",
338
391
.doc = "Environment variable passed to specified plugin" },
339
392
{ .name = "disable", .key = 'd',
340
393
.arg = "PLUGIN",
341
394
.doc = "Disable a specific plugin", .group = 1 },
395
{ .name = "enable", .key = 'e',
396
.arg = "PLUGIN",
397
.doc = "Enable a specific plugin", .group = 1 },
342
398
{ .name = "plugin-dir", .key = 128,
343
399
.arg = "DIRECTORY",
344
400
.doc = "Specify a different plugin directory", .group = 2 },
353
409
.doc = "Group ID the plugins will run as", .group = 3 },
354
410
{ .name = "debug", .key = 132,
355
411
.doc = "Debug mode", .group = 4 },
412
/*
413
* These reproduce what we would get without ARGP_NO_HELP
414
*/
415
{ .name = "help", .key = '?',
416
.doc = "Give this help list", .group = -1 },
417
{ .name = "usage", .key = -3,
418
.doc = "Give a short usage message", .group = -1 },
419
{ .name = "version", .key = 'V',
420
.doc = "Print program version", .group = -1 },
356
421
{ .name = NULL }
357
422
};
358
423
359
error_t parse_opt (int key, char *arg, __attribute__((unused)) struct argp_state *state) {
360
/* Get the INPUT argument from `argp_parse', which we know is a
361
pointer to our plugin list pointer. */
362
switch (key) {
424
__attribute__((nonnull(3)))
425
error_t parse_opt(int key, char *arg, struct argp_state *state){
426
errno = 0;
427
switch(key){
428
char *tmp;
429
intmax_t tmp_id;
363
430
case 'g': /* --global-options */
364
if (arg != NULL){
365
char *p;
366
while((p = strsep(&arg, ",")) != NULL){
367
if(p[0] == '\0'){
368
continue;
369
}
370
if(not add_argument(getplugin(NULL), p)){
371
perror("add_argument");
372
return ARGP_ERR_UNKNOWN;
373
}
374
}
375
}
376
break;
377
case 'e': /* --global-envs */
378
if(arg == NULL){
379
break;
380
}
381
431
{
382
char *envdef = strdup(arg);
383
if(envdef == NULL){
384
break;
385
}
386
if(not add_environment(getplugin(NULL), envdef)){
387
perror("add_environment");
432
char *plugin_option;
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(NULL), plugin_option)){
435
break;
436
}
388
437
}
389
438
}
390
439
break;
440
case 'G': /* --global-env */
441
add_environment(getplugin(NULL), arg, true);
442
break;
391
443
case 'o': /* --options-for */
392
if (arg != NULL){
393
char *p_name = strsep(&arg, ":");
394
if(p_name[0] == '\0'){
395
break;
396
}
397
char *opt = strsep(&arg, ":");
398
if(opt[0] == '\0'){
399
break;
400
}
401
if(opt != NULL){
402
char *p;
403
while((p = strsep(&opt, ",")) != NULL){
404
if(p[0] == '\0'){
405
continue;
406
}
407
if(not add_argument(getplugin(p_name), p)){
408
perror("add_argument");
409
return ARGP_ERR_UNKNOWN;
410
}
444
{
445
char *option_list = strchr(arg, ':');
446
if(option_list == NULL){
447
argp_error(state, "No colon in \"%s\"", arg);
448
errno = EINVAL;
449
break;
450
}
451
*option_list = '\0';
452
option_list++;
453
if(arg[0] == '\0'){
454
argp_error(state, "Empty plugin name");
455
errno = EINVAL;
456
break;
457
}
458
char *option;
459
while((option = strsep(&option_list, ",")) != NULL){
460
if(not add_argument(getplugin(arg), option)){
461
break;
411
462
}
412
463
}
413
464
}
414
465
break;
415
case 'f': /* --envs-for */
416
if(arg == NULL){
417
break;
418
}
466
case 'E': /* --env-for */
419
467
{
420
468
char *envdef = strchr(arg, ':');
421
469
if(envdef == NULL){
422
break;
423
}
424
char *p_name = strndup(arg, (size_t) (envdef-arg));
425
if(p_name == NULL){
426
break;
427
}
470
argp_error(state, "No colon in \"%s\"", arg);
471
errno = EINVAL;
472
break;
473
}
474
*envdef = '\0';
428
475
envdef++;
429
if(not add_environment(getplugin(p_name), envdef)){
430
perror("add_environment");
476
if(arg[0] == '\0'){
477
argp_error(state, "Empty plugin name");
478
errno = EINVAL;
479
break;
431
480
}
481
add_environment(getplugin(arg), envdef, true);
432
482
}
433
483
break;
434
484
case 'd': /* --disable */
435
if (arg != NULL){
436
plugin *p = getplugin(arg);
437
if(p == NULL){
438
return ARGP_ERR_UNKNOWN;
439
}
440
p->disabled = true;
485
{
486
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = true;
489
}
490
}
491
break;
492
case 'e': /* --enable */
493
{
494
plugin *p = getplugin(arg);
495
if(p != NULL){
496
p->disabled = false;
497
}
441
498
}
442
499
break;
443
500
case 128: /* --plugin-dir */
501
free(plugindir);
444
502
plugindir = strdup(arg);
445
if(plugindir == NULL){
446
perror("strdup");
447
}
448
break;
449
case 129: /* --config-file */
503
break;
504
case 129: /* --config-file */
505
/* This is already done by parse_opt_config_file() */
506
break;
507
case 130: /* --userid */
508
tmp_id = strtoimax(arg, &tmp, 10);
509
if(errno != 0 or tmp == arg or *tmp != '\0'
510
or tmp_id != (uid_t)tmp_id){
511
argp_error(state, "Bad user ID number: \"%s\", using %"
512
PRIdMAX, arg, (intmax_t)uid);
513
break;
514
}
515
uid = (uid_t)tmp_id;
516
break;
517
case 131: /* --groupid */
518
tmp_id = strtoimax(arg, &tmp, 10);
519
if(errno != 0 or tmp == arg or *tmp != '\0'
520
or tmp_id != (gid_t)tmp_id){
521
argp_error(state, "Bad group ID number: \"%s\", using %"
522
PRIdMAX, arg, (intmax_t)gid);
523
break;
524
}
525
gid = (gid_t)tmp_id;
526
break;
527
case 132: /* --debug */
528
debug = true;
529
break;
530
/*
531
* These reproduce what we would get without ARGP_NO_HELP
532
*/
533
case '?': /* --help */
534
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
535
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
536
case -3: /* --usage */
537
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
538
argp_state_help(state, state->out_stream,
539
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
540
case 'V': /* --version */
541
fprintf(state->out_stream, "%s\n", argp_program_version);
542
exit(EXIT_SUCCESS);
543
break;
544
/*
545
* When adding more options before this line, remember to also add a
546
* "case" to the "parse_opt_config_file" function below.
547
*/
548
case ARGP_KEY_ARG:
549
/* Cryptsetup always passes an argument, which is an empty
550
string if "none" was specified in /etc/crypttab. So if
551
argument was empty, we ignore it silently. */
552
if(arg[0] == '\0'){
553
break;
554
}
555
default:
556
return ARGP_ERR_UNKNOWN;
557
}
558
return errno; /* Set to 0 at start */
559
}
560
561
/* This option parser is the same as parse_opt() above, except it
562
ignores everything but the --config-file option. */
563
error_t parse_opt_config_file(int key, char *arg,
564
__attribute__((unused))
565
struct argp_state *state){
566
errno = 0;
567
switch(key){
568
case 'g': /* --global-options */
569
case 'G': /* --global-env */
570
case 'o': /* --options-for */
571
case 'E': /* --env-for */
572
case 'd': /* --disable */
573
case 'e': /* --enable */
574
case 128: /* --plugin-dir */
575
break;
576
case 129: /* --config-file */
577
free(argfile);
450
578
argfile = strdup(arg);
451
if(argfile == NULL){
452
perror("strdup");
453
}
454
break;
579
break;
455
580
case 130: /* --userid */
456
uid = (uid_t)strtol(arg, NULL, 10);
457
break;
458
581
case 131: /* --groupid */
459
gid = (gid_t)strtol(arg, NULL, 10);
460
break;
461
582
case 132: /* --debug */
462
debug = true;
463
break;
583
case '?': /* --help */
584
case -3: /* --usage */
585
case 'V': /* --version */
464
586
case ARGP_KEY_ARG:
465
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
466
break;
467
case ARGP_KEY_END:
468
587
break;
469
588
default:
470
589
return ARGP_ERR_UNKNOWN;
471
590
}
472
return 0;
591
return errno;
473
592
}
474
593
475
struct argp argp = { .options = options, .parser = parse_opt,
476
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
594
struct argp argp = { .options = options,
595
.parser = parse_opt_config_file,
596
.args_doc = "",
477
597
.doc = "Mandos plugin runner -- Run plugins" };
478
598
479
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
480
if (ret == ARGP_ERR_UNKNOWN){
481
fprintf(stderr, "Unknown error while parsing arguments\n");
482
exitstatus = EXIT_FAILURE;
599
/* Parse using parse_opt_config_file() in order to get the custom
600
config file location, if any. */
601
ret = argp_parse(&argp, argc, argv,
602
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
603
NULL, NULL);
604
switch(ret){
605
case 0:
606
break;
607
case ENOMEM:
608
default:
609
errno = ret;
610
error(0, errno, "argp_parse");
611
exitstatus = EX_OSERR;
612
goto fallback;
613
case EINVAL:
614
exitstatus = EX_USAGE;
483
615
goto fallback;
484
616
}
485
486
/* Opens the configfile if aviable */
487
if (argfile == NULL){
617
618
/* Reset to the normal argument parser */
619
argp.parser = parse_opt;
620
621
/* Open the configfile if available */
622
if(argfile == NULL){
488
623
conffp = fopen(AFILE, "r");
489
624
} else {
490
625
conffp = fopen(argfile, "r");
491
}
626
}
492
627
if(conffp != NULL){
493
628
char *org_line = NULL;
494
629
char *p, *arg, *new_arg, *line;
495
630
size_t size = 0;
496
ssize_t sret;
497
631
const char whitespace_delims[] = " \r\t\f\v\n";
498
632
const char comment_delim[] = "#";
499
633
500
634
custom_argc = 1;
501
635
custom_argv = malloc(sizeof(char*) * 2);
502
636
if(custom_argv == NULL){
503
perror("malloc");
504
exitstatus = EXIT_FAILURE;
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
505
639
goto fallback;
506
640
}
507
641
custom_argv[0] = argv[0];
508
642
custom_argv[1] = NULL;
509
510
/* for each line in the config file, strip whitespace and ignore commented text */
643
644
/* for each line in the config file, strip whitespace and ignore
645
commented text */
511
646
while(true){
512
647
sret = getline(&org_line, &size, conffp);
513
648
if(sret == -1){
514
649
break;
515
650
}
516
651
517
652
line = org_line;
518
653
arg = strsep(&line, comment_delim);
519
654
while((p = strsep(&arg, whitespace_delims)) != NULL){
522
657
}
523
658
new_arg = strdup(p);
524
659
if(new_arg == NULL){
525
perror("strdup");
526
exitstatus = EXIT_FAILURE;
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
527
662
free(org_line);
528
663
goto fallback;
529
664
}
532
667
custom_argv = realloc(custom_argv, sizeof(char *)
533
668
* ((unsigned int) custom_argc + 1));
534
669
if(custom_argv == NULL){
535
perror("realloc");
536
exitstatus = EXIT_FAILURE;
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
537
672
free(org_line);
538
673
goto fallback;
539
674
}
540
675
custom_argv[custom_argc-1] = new_arg;
541
custom_argv[custom_argc] = NULL;
676
custom_argv[custom_argc] = NULL;
542
677
}
543
678
}
679
do {
680
ret = fclose(conffp);
681
} while(ret == EOF and errno == EINTR);
682
if(ret == EOF){
683
error(0, errno, "fclose");
684
exitstatus = EX_IOERR;
685
goto fallback;
686
}
544
687
free(org_line);
545
} else{
688
} else {
546
689
/* Check for harmful errors and go to fallback. Other errors might
547
690
not affect opening plugins */
548
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
549
perror("fopen");
550
exitstatus = EXIT_FAILURE;
691
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
551
694
goto fallback;
552
695
}
553
696
}
554
/* If there was any arguments from configuration file,
555
pass them to parser as command arguments */
697
/* If there were any arguments from the configuration file, pass
698
them to parser as command line arguments */
556
699
if(custom_argv != NULL){
557
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
558
if (ret == ARGP_ERR_UNKNOWN){
559
fprintf(stderr, "Unknown error while parsing arguments\n");
560
exitstatus = EXIT_FAILURE;
700
ret = argp_parse(&argp, custom_argc, custom_argv,
701
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
702
NULL, NULL);
703
switch(ret){
704
case 0:
705
break;
706
case ENOMEM:
707
default:
708
errno = ret;
709
error(0, errno, "argp_parse");
710
exitstatus = EX_OSERR;
711
goto fallback;
712
case EINVAL:
713
exitstatus = EX_CONFIG;
561
714
goto fallback;
562
715
}
563
716
}
564
717
718
/* Parse actual command line arguments, to let them override the
719
config file */
720
ret = argp_parse(&argp, argc, argv,
721
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
722
NULL, NULL);
723
switch(ret){
724
case 0:
725
break;
726
case ENOMEM:
727
default:
728
errno = ret;
729
error(0, errno, "argp_parse");
730
exitstatus = EX_OSERR;
731
goto fallback;
732
case EINVAL:
733
exitstatus = EX_USAGE;
734
goto fallback;
735
}
736
565
737
if(debug){
566
738
for(plugin *p = plugin_list; p != NULL; p=p->next){
567
739
fprintf(stderr, "Plugin: %s has %d arguments\n",
569
741
for(char **a = p->argv; *a != NULL; a++){
570
742
fprintf(stderr, "\tArg: %s\n", *a);
571
743
}
572
fprintf(stderr, "...and %u environment variables\n", p->envc);
744
fprintf(stderr, "...and %d environment variables\n", p->envc);
573
745
for(char **a = p->environ; *a != NULL; a++){
574
746
fprintf(stderr, "\t%s\n", *a);
575
747
}
576
748
}
577
749
}
578
579
/* Strip permissions down to nobody */
750
751
if(getuid() == 0){
752
/* Work around Debian bug #633582:
753
<http://bugs.debian.org/633582> */
754
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
755
if(plugindir_fd == -1){
756
error(0, errno, "open");
757
} else {
758
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
759
if(ret == -1){
760
error(0, errno, "fstat");
761
} else {
762
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
763
ret = fchown(plugindir_fd, uid, gid);
764
if(ret == -1){
765
error(0, errno, "fchown");
766
}
767
}
768
}
769
TEMP_FAILURE_RETRY(close(plugindir_fd));
770
}
771
}
772
773
/* Lower permissions */
774
ret = setgid(gid);
775
if(ret == -1){
776
error(0, errno, "setgid");
777
}
580
778
ret = setuid(uid);
581
if (ret == -1){
582
perror("setuid");
583
}
584
setgid(gid);
585
if (ret == -1){
586
perror("setgid");
587
}
588
589
if (plugindir == NULL){
590
dir = opendir(PDIR);
591
} else {
592
dir = opendir(plugindir);
593
}
594
595
if(dir == NULL){
596
perror("Could not open plugin dir");
597
exitstatus = EXIT_FAILURE;
598
goto fallback;
599
}
600
601
/* Set the FD_CLOEXEC flag on the directory, if possible */
779
if(ret == -1){
780
error(0, errno, "setuid");
781
}
782
783
/* Open plugin directory with close_on_exec flag */
602
784
{
603
int dir_fd = dirfd(dir);
604
if(dir_fd >= 0){
605
ret = set_cloexec_flag(dir_fd);
606
if(ret < 0){
607
perror("set_cloexec_flag");
608
exitstatus = EXIT_FAILURE;
609
goto fallback;
610
}
785
int dir_fd = -1;
786
if(plugindir == NULL){
787
dir_fd = open(PDIR, O_RDONLY |
788
#ifdef O_CLOEXEC
789
O_CLOEXEC
790
#else /* not O_CLOEXEC */
791
0
792
#endif /* not O_CLOEXEC */
793
);
794
} else {
795
dir_fd = open(plugindir, O_RDONLY |
796
#ifdef O_CLOEXEC
797
O_CLOEXEC
798
#else /* not O_CLOEXEC */
799
0
800
#endif /* not O_CLOEXEC */
801
);
802
}
803
if(dir_fd == -1){
804
error(0, errno, "Could not open plugin dir");
805
exitstatus = EX_UNAVAILABLE;
806
goto fallback;
807
}
808
809
#ifndef O_CLOEXEC
810
/* Set the FD_CLOEXEC flag on the directory */
811
ret = set_cloexec_flag(dir_fd);
812
if(ret < 0){
813
error(0, errno, "set_cloexec_flag");
814
TEMP_FAILURE_RETRY(close(dir_fd));
815
exitstatus = EX_OSERR;
816
goto fallback;
817
}
818
#endif /* O_CLOEXEC */
819
820
dir = fdopendir(dir_fd);
821
if(dir == NULL){
822
error(0, errno, "Could not open plugin dir");
823
TEMP_FAILURE_RETRY(close(dir_fd));
824
exitstatus = EX_OSERR;
825
goto fallback;
611
826
}
612
827
}
613
828
614
829
FD_ZERO(&rfds_all);
615
830
616
831
/* Read and execute any executable in the plugin directory*/
617
832
while(true){
618
dirst = readdir(dir);
833
do {
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
619
836
620
// All directory entries have been processed
837
/* All directory entries have been processed */
621
838
if(dirst == NULL){
622
if (errno == EBADF){
623
perror("readdir");
624
exitstatus = EXIT_FAILURE;
839
if(errno == EBADF){
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
625
842
goto fallback;
626
843
}
627
844
break;
629
846
630
847
d_name_len = strlen(dirst->d_name);
631
848
632
// Ignore dotfiles, backup files and other junk
849
/* Ignore dotfiles, backup files and other junk */
633
850
{
634
851
bool bad_name = false;
635
852
637
854
638
855
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
639
856
".dpkg-old",
857
".dpkg-bak",
640
858
".dpkg-divert", NULL };
641
859
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
642
860
size_t pre_len = strlen(*pre);
656
874
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
657
875
size_t suf_len = strlen(*suf);
658
876
if((d_name_len >= suf_len)
659
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
660
878
== 0)){
661
879
if(debug){
662
880
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
671
889
continue;
672
890
}
673
891
}
674
892
675
893
char *filename;
676
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
894
if(plugindir == NULL){
895
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
896
dirst->d_name));
897
} else {
898
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
899
plugindir,
900
dirst->d_name));
901
}
677
902
if(ret < 0){
678
perror("asprintf");
903
error(0, errno, "asprintf");
679
904
continue;
680
905
}
681
906
682
ret = stat(filename, &st);
683
if (ret == -1){
684
perror("stat");
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
908
if(ret == -1){
909
error(0, errno, "stat");
685
910
free(filename);
686
911
continue;
687
912
}
688
913
689
914
/* Ignore non-executable files */
690
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
915
if(not S_ISREG(st.st_mode)
916
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
691
917
if(debug){
692
918
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
693
919
" with bad type or mode\n", filename);
698
924
699
925
plugin *p = getplugin(dirst->d_name);
700
926
if(p == NULL){
701
perror("getplugin");
927
error(0, errno, "getplugin");
702
928
free(filename);
703
929
continue;
704
930
}
716
942
if(g != NULL){
717
943
for(char **a = g->argv + 1; *a != NULL; a++){
718
944
if(not add_argument(p, *a)){
719
perror("add_argument");
945
error(0, errno, "add_argument");
720
946
}
721
947
}
722
948
/* Add global environment variables */
723
949
for(char **e = g->environ; *e != NULL; e++){
724
if(not add_environment(p, *e)){
725
perror("add_environment");
950
if(not add_environment(p, *e, false)){
951
error(0, errno, "add_environment");
726
952
}
727
953
}
728
954
}
732
958
process, too. */
733
959
if(p->environ[0] != NULL){
734
960
for(char **e = environ; *e != NULL; e++){
735
char *copy = strdup(*e);
736
if(copy == NULL){
737
perror("strdup");
738
continue;
739
}
740
if(not add_environment(p, copy)){
741
perror("add_environment");
961
if(not add_environment(p, *e, false)){
962
error(0, errno, "add_environment");
742
963
}
743
964
}
744
965
}
745
966
746
967
int pipefd[2];
747
ret = pipe(pipefd);
748
if (ret == -1){
749
perror("pipe");
750
exitstatus = EXIT_FAILURE;
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
969
if(ret == -1){
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
751
972
goto fallback;
752
973
}
753
974
/* Ask OS to automatic close the pipe on exec */
754
975
ret = set_cloexec_flag(pipefd[0]);
755
976
if(ret < 0){
756
perror("set_cloexec_flag");
757
exitstatus = EXIT_FAILURE;
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
758
979
goto fallback;
759
980
}
760
981
ret = set_cloexec_flag(pipefd[1]);
761
982
if(ret < 0){
762
perror("set_cloexec_flag");
763
exitstatus = EXIT_FAILURE;
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
764
985
goto fallback;
765
986
}
766
987
/* Block SIGCHLD until process is safely in process list */
767
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
988
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
989
&sigchld_action.sa_mask,
990
NULL));
768
991
if(ret < 0){
769
perror("sigprocmask");
770
exitstatus = EXIT_FAILURE;
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
771
994
goto fallback;
772
995
}
773
// Starting a new process to be watched
774
pid_t pid = fork();
996
/* Starting a new process to be watched */
997
pid_t pid;
998
do {
999
pid = fork();
1000
} while(pid == -1 and errno == EINTR);
775
1001
if(pid == -1){
776
perror("fork");
777
exitstatus = EXIT_FAILURE;
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
778
1004
goto fallback;
779
1005
}
780
1006
if(pid == 0){
781
1007
/* this is the child process */
782
1008
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
783
1009
if(ret < 0){
784
perror("sigaction");
785
_exit(EXIT_FAILURE);
1010
error(0, errno, "sigaction");
1011
_exit(EX_OSERR);
786
1012
}
787
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1013
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
788
1014
if(ret < 0){
789
perror("sigprocmask");
790
_exit(EXIT_FAILURE);
1015
error(0, errno, "sigprocmask");
1016
_exit(EX_OSERR);
791
1017
}
792
1018
793
1019
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
794
1020
if(ret == -1){
795
perror("dup2");
796
_exit(EXIT_FAILURE);
1021
error(0, errno, "dup2");
1022
_exit(EX_OSERR);
797
1023
}
798
1024
799
1025
if(dirfd(dir) < 0){
803
1029
}
804
1030
if(p->environ[0] == NULL){
805
1031
if(execv(filename, p->argv) < 0){
806
perror("execv");
807
_exit(EXIT_FAILURE);
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
808
1034
}
809
1035
} else {
810
1036
if(execve(filename, p->argv, p->environ) < 0){
811
perror("execve");
812
_exit(EXIT_FAILURE);
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
813
1039
}
814
1040
}
815
1041
/* no return */
816
1042
}
817
1043
/* Parent process */
818
close(pipefd[1]); /* Close unused write end of pipe */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
819
1046
free(filename);
820
1047
plugin *new_plugin = getplugin(dirst->d_name);
821
if (new_plugin == NULL){
822
perror("getplugin");
823
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1048
if(new_plugin == NULL){
1049
error(0, errno, "getplugin");
1050
ret = (int)(TEMP_FAILURE_RETRY
1051
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1052
NULL)));
824
1053
if(ret < 0){
825
perror("sigprocmask");
1054
error(0, errno, "sigprocmask");
826
1055
}
827
exitstatus = EXIT_FAILURE;
1056
exitstatus = EX_OSERR;
828
1057
goto fallback;
829
1058
}
830
1059
833
1062
834
1063
/* Unblock SIGCHLD so signal handler can be run if this process
835
1064
has already completed */
836
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1066
&sigchld_action.sa_mask,
1067
NULL));
837
1068
if(ret < 0){
838
perror("sigprocmask");
839
exitstatus = EXIT_FAILURE;
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
840
1071
goto fallback;
841
1072
}
842
1073
843
FD_SET(new_plugin->fd, &rfds_all);
1074
#if defined (__GNUC__) and defined (__GLIBC__)
1075
#if not __GLIBC_PREREQ(2, 16)
1076
#pragma GCC diagnostic push
1077
#pragma GCC diagnostic ignored "-Wsign-conversion"
1078
#endif
1079
#endif
1080
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1081
-Wconversion in GNU libc
1082
before 2.16 */
1083
#if defined (__GNUC__) and defined (__GLIBC__)
1084
#if not __GLIBC_PREREQ(2, 16)
1085
#pragma GCC diagnostic pop
1086
#endif
1087
#endif
844
1088
845
if (maxfd < new_plugin->fd){
1089
if(maxfd < new_plugin->fd){
846
1090
maxfd = new_plugin->fd;
847
1091
}
848
849
1092
}
850
1093
851
closedir(dir);
1094
TEMP_FAILURE_RETRY(closedir(dir));
852
1095
dir = NULL;
853
1096
free_plugin(getplugin(NULL));
1097
854
1098
for(plugin *p = plugin_list; p != NULL; p = p->next){
855
1099
if(p->pid != 0){
856
1100
break;
861
1105
free_plugin_list();
862
1106
}
863
1107
}
864
1108
865
1109
/* Main loop while running plugins exist */
866
1110
while(plugin_list){
867
1111
fd_set rfds = rfds_all;
868
1112
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
869
if (select_ret == -1){
870
perror("select");
871
exitstatus = EXIT_FAILURE;
1113
if(select_ret == -1 and errno != EINTR){
1114
error(0, errno, "select");
1115
exitstatus = EX_OSERR;
872
1116
goto fallback;
873
1117
}
874
1118
/* OK, now either a process completed, or something can be read
875
1119
from one of them */
876
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1120
for(plugin *proc = plugin_list; proc != NULL;){
877
1121
/* Is this process completely done? */
878
if(proc->eof and proc->completed){
1122
if(proc->completed and proc->eof){
879
1123
/* Only accept the plugin output if it exited cleanly */
880
1124
if(not WIFEXITED(proc->status)
881
1125
or WEXITSTATUS(proc->status) != 0){
882
1126
/* Bad exit by plugin */
883
1127
884
1128
if(debug){
885
1129
if(WIFEXITED(proc->status)){
886
fprintf(stderr, "Plugin %u exited with status %d\n",
887
(unsigned int) (proc->pid),
1130
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1131
" status %d\n", proc->name,
1132
(intmax_t) (proc->pid),
888
1133
WEXITSTATUS(proc->status));
889
} else if(WIFSIGNALED(proc->status)) {
890
fprintf(stderr, "Plugin %u killed by signal %d\n",
891
(unsigned int) (proc->pid),
892
WTERMSIG(proc->status));
1134
} else if(WIFSIGNALED(proc->status)){
1135
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1136
" signal %d: %s\n", proc->name,
1137
(intmax_t) (proc->pid),
1138
WTERMSIG(proc->status),
1139
strsignal(WTERMSIG(proc->status)));
893
1140
} else if(WCOREDUMP(proc->status)){
894
fprintf(stderr, "Plugin %d dumped core\n",
895
(unsigned int) (proc->pid));
1141
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1142
" core\n", proc->name, (intmax_t) (proc->pid));
896
1143
}
897
1144
}
898
1145
899
1146
/* Remove the plugin */
900
FD_CLR(proc->fd, &rfds_all);
901
1147
#if defined (__GNUC__) and defined (__GLIBC__)
1148
#if not __GLIBC_PREREQ(2, 16)
1149
#pragma GCC diagnostic push
1150
#pragma GCC diagnostic ignored "-Wsign-conversion"
1151
#endif
1152
#endif
1153
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1154
-Wconversion in GNU libc
1155
before 2.16 */
1156
#if defined (__GNUC__) and defined (__GLIBC__)
1157
#if not __GLIBC_PREREQ(2, 16)
1158
#pragma GCC diagnostic pop
1159
#endif
1160
#endif
1161
902
1162
/* Block signal while modifying process_list */
903
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1163
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1164
(SIG_BLOCK,
1165
&sigchld_action.sa_mask,
1166
NULL));
904
1167
if(ret < 0){
905
perror("sigprocmask");
906
exitstatus = EXIT_FAILURE;
1168
error(0, errno, "sigprocmask");
1169
exitstatus = EX_OSERR;
907
1170
goto fallback;
908
1171
}
1172
1173
plugin *next_plugin = proc->next;
909
1174
free_plugin(proc);
1175
proc = next_plugin;
1176
910
1177
/* We are done modifying process list, so unblock signal */
911
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
912
NULL);
1178
ret = (int)(TEMP_FAILURE_RETRY
1179
(sigprocmask(SIG_UNBLOCK,
1180
&sigchld_action.sa_mask, NULL)));
913
1181
if(ret < 0){
914
perror("sigprocmask");
915
exitstatus = EXIT_FAILURE;
1182
error(0, errno, "sigprocmask");
1183
exitstatus = EX_OSERR;
916
1184
goto fallback;
917
1185
}
918
1186
919
1187
if(plugin_list == NULL){
920
1188
break;
921
1189
}
1190
922
1191
continue;
923
1192
}
924
1193
925
1194
/* This process exited nicely, so print its buffer */
926
1195
927
1196
bool bret = print_out_password(proc->buffer,
928
1197
proc->buffer_length);
929
1198
if(not bret){
930
perror("print_out_password");
931
exitstatus = EXIT_FAILURE;
1199
error(0, errno, "print_out_password");
1200
exitstatus = EX_IOERR;
932
1201
}
933
1202
goto fallback;
934
1203
}
935
1204
936
1205
/* This process has not completed. Does it have any output? */
937
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1206
#if defined (__GNUC__) and defined (__GLIBC__)
1207
#if not __GLIBC_PREREQ(2, 16)
1208
#pragma GCC diagnostic push
1209
#pragma GCC diagnostic ignored "-Wsign-conversion"
1210
#endif
1211
#endif
1212
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1213
warning from
1214
-Wconversion
1215
in GNU libc
1216
before
1217
2.16 */
1218
#if defined (__GNUC__) and defined (__GLIBC__)
1219
#if not __GLIBC_PREREQ(2, 16)
1220
#pragma GCC diagnostic pop
1221
#endif
1222
#endif
938
1223
/* This process had nothing to say at this time */
1224
proc = proc->next;
939
1225
continue;
940
1226
}
941
1227
/* Before reading, make the process' data buffer large enough */
942
1228
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
943
1229
proc->buffer = realloc(proc->buffer, proc->buffer_size
944
1230
+ (size_t) BUFFER_SIZE);
945
if (proc->buffer == NULL){
946
perror("malloc");
947
exitstatus = EXIT_FAILURE;
1231
if(proc->buffer == NULL){
1232
error(0, errno, "malloc");
1233
exitstatus = EX_OSERR;
948
1234
goto fallback;
949
1235
}
950
1236
proc->buffer_size += BUFFER_SIZE;
951
1237
}
952
1238
/* Read from the process */
953
ret = read(proc->fd, proc->buffer + proc->buffer_length,
954
BUFFER_SIZE);
955
if(ret < 0){
1239
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1240
proc->buffer
1241
+ proc->buffer_length,
1242
BUFFER_SIZE));
1243
if(sret < 0){
956
1244
/* Read error from this process; ignore the error */
1245
proc = proc->next;
957
1246
continue;
958
1247
}
959
if(ret == 0){
1248
if(sret == 0){
960
1249
/* got EOF */
961
1250
proc->eof = true;
962
1251
} else {
963
proc->buffer_length += (size_t) ret;
1252
proc->buffer_length += (size_t) sret;
964
1253
}
965
1254
}
966
1255
}
967
968
1256
1257
969
1258
fallback:
970
1259
971
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1260
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1261
and exitstatus != EX_OK)){
972
1262
/* Fallback if all plugins failed, none are found or an error
973
1263
occured */
974
1264
bool bret;
975
1265
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
976
1266
char *passwordbuffer = getpass("Password: ");
977
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1267
size_t len = strlen(passwordbuffer);
1268
/* Strip trailing newline */
1269
if(len > 0 and passwordbuffer[len-1] == '\n'){
1270
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1271
len--;
1272
}
1273
bret = print_out_password(passwordbuffer, len);
978
1274
if(not bret){
979
perror("print_out_password");
980
exitstatus = EXIT_FAILURE;
1275
error(0, errno, "print_out_password");
1276
exitstatus = EX_IOERR;
981
1277
}
982
1278
}
983
1279
984
1280
/* Restore old signal handler */
985
1281
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
986
1282
if(ret == -1){
987
perror("sigaction");
988
exitstatus = EXIT_FAILURE;
1283
error(0, errno, "sigaction");
1284
exitstatus = EX_OSERR;
989
1285
}
990
1286
991
1287
if(custom_argv != NULL){
992
1288
for(char **arg = custom_argv+1; *arg != NULL; arg++){
993
1289
free(*arg);
999
1295
closedir(dir);
1000
1296
}
1001
1297
1002
/* Free the process list and kill the processes */
1298
/* Kill the processes */
1003
1299
for(plugin *p = plugin_list; p != NULL; p = p->next){
1004
1300
if(p->pid != 0){
1005
1301
close(p->fd);
1006
1302
ret = kill(p->pid, SIGTERM);
1007
1303
if(ret == -1 and errno != ESRCH){
1008
1304
/* Set-uid proccesses might not get closed */
1009
perror("kill");
1305
error(0, errno, "kill");
1010
1306
}
1011
1307
}
1012
1308
}
1013
1309
1014
1310
/* Wait for any remaining child processes to terminate */
1015
do{
1311
do {
1016
1312
ret = wait(NULL);
1017
1313
} while(ret >= 0);
1018
1314
if(errno != ECHILD){
1019
perror("wait");
1315
error(0, errno, "wait");
1020
1316
}
1021
1317
1022
1318
free_plugin_list();
1023
1319
1024
1320
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0